Consulta: subjectFacets:"Allometry"
Registros recuperados: 51
Data/hora: 09/06/2024 05:34:43

Аллометрия скоростей роста, питания и метаболизма гребневиков и медуз
Provedor de dados: 13
Autores: Заика, В. Е.
На материалах по росту и скорости метаболизма гребневиков и медуз подтверждено ра­нее сделанное автором заключение о соответствии роста этих желетелых животных экспоненци­альному варианту балансовой модели роста. Эта модель основана на предположении, что при экспоненциальном росте аллометрические уравнения скоростей питания и метаболизма имеют показатель степени, равный 1 (изометрия), что и подтверждают данные по аллометрии скорости дыхания и экскреции аммиака. Изометрия физиологических скоростей, по мнению автора, связана с отсутствием у же­летелых скелета и вероятным сохранением постоянной доли мезоглеи в теле гребневиков и медуз по мере их роста.
Tipo: Journal Contribution
Palavras-chave: Allometry; Growth rate; Allometry; Growth rate; Http://aims.fao.org/aos/agrovoc/c_24962; Http://aims.fao.org/aos/agrovoc/c_16130.
Ano: 2002
URL: http://repository.ibss.org.ua/dspace/handle/99011/502

Biometry of neotropical invertebrates inhabiting floodplain rivers: unraveling bionomy
Provedor de dados: 76
Autores: Zilli,Florencia; Barco,Julia del; Vanzetti,Agustín.
ABSTRACT Currently, it is widely recognized that invertebrates play key roles in neotropical floodplains and in many other environments worldwide. However, little information has been published concerning their biometry, in spite that it represents an essential tool for many different studies. Here, we provided length-mass and length-length relationships by fitting the linearized model (log10 Y = log10a + b log10 X) and several mean biomass ratios ± SE for bivalves, gastropods, quironomids, ephemeropterans, oligochaetes and hirudineans. We measured, weighed, oven dried and incinerated to ashes specimens collected from 2005 to 2014 in the Paraná River, Argentina. The lineal equations had fit levels higher than 75% in most of the significant regressions....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Organic matter; Paraná River; Wetlands; Benthos; Pleuston.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212017000100214

Relative growth of freshwater prawn Macrobrachium brasiliense (Decapoda, Palaemonidae) and its implications for reproduction
Provedor de dados: 76
Autores: Nogueira,Caio dos Santos; Oliveira,Marcela Silvano de; Jacobucci,Giuliano Buzá; Almeida,Ariádine Cristine de.
ABSTRACT The main objective of this study was to estimate the morphological sexual maturity of Macrobrachium brasiliense (Heller, 1862) and to analyze the relative growth of the species. During one year of sampling, from July 2012 to June 2013, 199 specimens were collected in a stream located in a Cerrado biome, in the Triângulo Mineiro region, state of Minas Gerais. Once identified and sexed, the length of the carapace, the length of the segments of the chelipeds (ischium, merus, carpus, propodus and dactyl) and width of the pleura were measured (mm). The maximum and mean sizes of the carapace length measured 20.5 mm (Mean: 9.6 ± 4.2 mm) and 20.1 mm (Mean: 7.7 ± 3.4 mm) for males and females, respectively. The propodus length for males, and the pleura...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Morphological sexual maturity; Reproductive biology.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212019000100205

Length–weight relations of 70 fish species (Actinopterygii) from tropical coastal region of Pernambuco, Northeast Brazil.
Provedor de dados: 5
Autores: Viana, Andrea P.; Lucena-fredou, Flavia; Menard, Frederic; Fredou, Thierry; Ferreira, Valdimere; Lira, Alex S.; Le Loch, Francois.
The presently reported study provides length-weight relations (LWR) of 70 fish species (Actinopterygii) from the tropical coastal region of Pernambuco, Northeast Brazil: Achirus declivis, Achirus lineatus, Anchoa spinifer, Anchoa tricolor, Anchovia clupeoides, Archosargus rhomboidalis, Aspistor luniscutis, Aspistor quadriscutis, Bagre bagre, Bagre marinus, Bairdiella ronchus, Bathygobius soporator, Carangoides bartholomaei, Caranx hippos, Caranx latus, Caranx ruber, Centropomus parallelus, Centropomus pectinatus, Centropomus undecimalis, Chaetodipterus faber, Chloroscombrus chrysurus, Citharichthys spilopterus, Conodon nobilis, Ctenogobius boleosoma, Cynoscion virescens, Diapterus auratus, Diapterus rhombeus, Engraulis anchoita, Etropus crossotus,...
Tipo: Text
Palavras-chave: Ichthyofauna; Estuary; Coast; Allometry; Tropical South Atlantic.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00359/47039/72975.pdf

Setting population targets for mammals using body mass as a predictor of population persistence
Provedor de dados: 5
Autores: Hilbers, Jelle P.; Santini, Luca; Visconti, Piero; Schipper, Aafke M.; Pinto, Cecilia; Rondinini, Carlo; Huijbregts, Mark A. J.
Conservation planning and biodiversity assessments need quantitative targets to optimize planning options and assess the adequacy of current species protection. However, targets aiming at persistence require population-specific data, which limits their use in favor of fixed and non-specific targets, likely leading to unequal distribution of conservation efforts among species. Here we propose a method to derive equitable population targets, which are quantitative targets of population size that ensure equal probabilities of persistence across a set of species, and can be easily inferred from species-specific traits. We applied population dynamics models across a range of life-history traits representative for mammals, and estimated minimum viable population...
Tipo: Text
Palavras-chave: Allometry; Conservation biology; Conservation target; Extinction; Minimum viable population; Population viability analysis; Wildlife; Wildlife management.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00353/46387/46013.csv

Relations entre l’état d’une ressource et son exploitation via la compréhension et la formalisation des interactions de socio-écosystèmes. Application à la palourde japonaise (Venerupis philippinarum) du bassin d’Arcachon.
Provedor de dados: 5
Autores: Caill-milly, Nathalie.
Significant component of the marine benthic ecosystem, exploited bivalves are mainly located inside the coastal area, which temporal and spatial features generate natural population fluctuations and contribute to considerable biomass and demographic structure changes added to anthropogenic activities’ effects (fishing, pollution,…). Understanding of the relationships between the species, its environment and its exploitation is crucial and their formalization, including for management purposes, requires development of mathematical models that aim at describing the functioning of the system, to explain the observed phenomenon in terms of cause and effect or predict effects of new causes. Originating from venerid culture trials carried out in France in the...
Tipo: Text
Palavras-chave: Bivalve; Morphométrie; Allométrie; Dynamique des populations; Système dynamique; Gestion; Palourde japonaise; Venerupis philippinarum; Bivalve; Morphometry; Allometry; Population dynamics; Dynamic system; Management; Manila clam; Venerupis philippinarum.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00139/25034/23143.pdf

A continuous model of biomass size spectra governed by predation and the effects of fishing on them
Provedor de dados: 5
Autores: Benoit, Eric; Rochet, Marie-joelle.
A new time-dependent continuous model of biomass size spectra is developed. In this model, predation is the single process governing the energy flow in the ecosystem, as it causes both growth and mortality. The ratio of predator to prey is assumed to be distributed: predators may feed on a range of prey sizes. Under these assumptions, it is shown that linear size spectra are stationary solutions of the model. Exploited fish communities are simulated by adding fishing mortality to the model: it is found that realistic fishing should affect the curvature and stability of the size spectrum rather than its slope.
Tipo: Text
Palavras-chave: Predation; Mortality; Growth; Biomass size spectrum; Allometry.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-665.pdf

Global patterns and predictors of trophic position, body size and jaw size in fishes
Provedor de dados: 5
Autores: Kopf, R. Keller; Yen, Jian D. L.; Nimmo, Dale G.; Brosse, Sébastien; Villeger, Sébastien; Tittensor, Derek.
Aim The aim of this study was test whether maximum body mass and jaw length are reliable predictors of trophic position (TP) in fishes, and to compare linear and nonlinear machine‐learning (ML) models incorporating biogeography, habitat and other morphological traits. Location Global. Time period Modern. Major taxa studied Fishes. Methods We compiled a global database of TP (2.0–4.5), maximum body mass, jaw length, order, ecoregion, habitat and other morphological traits of freshwater, estuarine and diadromous fishes (n = 1,991). We used Bayesian linear mixed effects and ML, with r2 analogues and 10‐fold cross‐validation, to explain and predict TP. Results Random forest models outperformed Bayesian models in all comparisons. Jaw length was the most...
Tipo: Text
Palavras-chave: Allometric trophic network models; Allometry; Body mass; Gape limitation; Machine learning; Predator&amp;#8211; Prey; Random forest; Trophic network theory.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00661/77349/78823.pdf

Topographical Anatomy of the Blunthead Treesnake, Imantodes cenchoa (Linnaeus, 1758) (Colubridae: Xenodontinae)
Provedor de dados: 77
Autores: Aveiro-Lins,Gustavo; Rocha-Barbosa,Oscar; Salomão,Maria da Graça; Puorto,Giuseppe; de Castro Loguercio,Mariana Fiuza.
Imantodes cenchoa (Duméril, 1853) is an arboreal, nocturnal and oviparous xenodontine snake, which feeds on amphibians and lizards. It is found in Central and South America, including northern and central Brazil. In this work, we investigated the relationship between topographic anatomy and habitat in I. cenchoa. Twenty specimens (13 non pregnant females and 7 males) were examined. The topographic anatomy study was realized through observations of the internal anatomy, particularly the position and size of lung, heart, liver, left and right gonads and left and right kidneys. Results showed that all the organs are located in a posterior position in relation to the snout vent length (SVL). The centre of gravity is found at about 74% of SVL in both males and...
Tipo: Journal article
Palavras-chave: Snakes; Ecomorphology; Anatomy; Allometry; Arboreality.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000100009

Tooth size and metabolic requirements in Primates: The 'equivalence between exponents' under discussion
Provedor de dados: 77
Autores: Jiménez-Arenas,Juan Manuel.
The functional significance of teeth size, specifically postcanine tooth size has contributed a vast amount of scientific literature. Nevertheless, these studies have been based on 'equivalence between exponents'. That is, when the tooth size scales to the 0.75 power of body size exponent is interpreted as reflecting differences in metabolic requirements. On the contrary, if the obtained exponent is close to isometry, such slope is interpreted as that variation in teeth size is an incidental consequence of body size variation. In this paper, we show the results of a study in which the relationship between postcanine tooth occlusal area (PCOA) and basal metabolic rate (BMR) has been evaluated in 28 primate species. On one hand, the results obtained indicate...
Tipo: Journal article
Palavras-chave: Postcanine tooth size; Basal metabolic rate; Allometry; Body size.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400008

Morphometric variation in two intertidal littorinid gastropods
Provedor de dados: 16
Autores: Queiroga, H.; Costa, R.; Leonardo, N.; Soares, D.; Cleary, D.F.R.
Here we investigate spatial variation in shell shape of Littorina saxatilis, an ovoviviparous species, and Melarhaphe neritoides, a species with planktonic eggs and larvae. Populations of both species were sampled in 6 sites located along the west coast of the Iberian Peninsula. Shell shape was studied using landmarkbased morphometric methods. Landmark data was used to estimate individual size and to describe shell shape. Prior to statistical analysis specimens were aligned using Generalised Procrustes Analysis (GPA). Ordinations based on GPA of landmark data and using Principal Components Analysis (PCA), revealed a clear spatial segregation of sites for both species, although this was more evident for L. saxatilis than M. neritoides. Statistical analysis...
Tipo: Article / Letter to the editor
Palavras-chave: Allometry; Dispersal; Life-history traits; Rocky shores; Shell shape; Western Iberia; 42.72.
Ano: 2011
URL: http://www.repository.naturalis.nl/record/395161

Modularity and cranial integration across ontogenetic stages in Martino’s vole, Dinaromys bogdanovi
Provedor de dados: 16
Autores: Klenovšek, T.; Jojić, V.
We explored modularity and morphological integration of the ventral cranium during postnatal ontogeny in Martino’s vole (Dinaromys bogdanovi). Two closely related phylogenetic groups, originating from the Central and Southeastern part of the species range in the western Balkans, were considered. As expected, both phylogroups had similar patterns of ontogenetic changes in cranial size and shape variation, modularity and integration. At the level of within individual variation, the hypothesis that the viscerocranial and neurocranial regions are separate modules was rejected, indicating that the hypothesized modules are not developmental, but rather functional. At the level of among individual variation, the viscerocranium and the neurocranium could not be...
Tipo: Article / Letter to the editor
Palavras-chave: Allometry; Fluctuating asymmetry; Geometric morphometrics; Neurocranium; Ontogeny; Ventrviscerocranium; Viscerocranium.
Ano: 2016
URL: http://www.repository.naturalis.nl/record/613890

Landmark-based morphometric analysis of two sibling species of the genus Asida (Coleoptera, Tenebrionidae)
Provedor de dados: 16
Autores: Palmer, Miquel.
The case described here analyses morphological change at the boundary between ecological and evolutionary scales. The size and shape of 8 populations of two sibling species of tenebrionid beetles (Asida planipennis and A. moraguesi) are analysed using landmark-based methods. The two species differ in size, shape and in allometric trajectory. Thin-Plate Spline Analysis (TPSA) combined with Canonical Variate Analysis (CVA) reveal the specific shape changes that allow the best inter-species discrimination. These changes involve the outline of the posterior margin of the pronotum. Moreover, the landmarkbased method provides useful tools for interpreting the intraspecies variability of some continuously varying morphological characters. In the case of A....
Tipo: Article / Letter to the editor
Palavras-chave: Geometric morphometry; Thin-Plate spline analysis; Canonical variates analysis; Species discrimination; Allometry; Tenebrionidae (Coleoptera).
Ano: 2002
URL: http://www.repository.naturalis.nl/record/534354

Ontogenetic trajectories and hind tibia geometric morphometrics of Holymenia clavigera (Herbst) and Anisoscelis foliacea marginella (Dallas) (Hemiptera: Coreidae)
Provedor de dados: 82
Autores: Rodrigues,Daniela; Sanfelice,Daniela; Monteiro,Leandro R.; Moreira,Gilson R.P.
Holymenia clavigera (Herbst) and Anisoscelis foliacea marginella (Dallas) (Hemiptera: Coreidae) are distributed in southern Brazil and belong to the poorly studied tribe Anisoscelini. Preliminary observations indicate an ample coexistence of these species in terms of host-plant use. There is also a strong similarity regarding egg and nymph morphology. We characterized and compared their ontogenetic trajectories by means of growth curves and multivariate ontogenetic allometry, since the only apparent difference between these species is a remarkable growth in the hind tibia of A. foliacea marginella. Because their hind tibia is similar in the early instars, the shape variation of this structure was quantified by the thin plate splines function with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Anisoscelini; Growth; Immature stage; Shape analysis.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2005000500008

A test of Allen's rule in ectotherms: the case of two south American Melanopline Grasshoppers (Orthoptera: Acrididae) with partially overlapping geographic ranges
Provedor de dados: 82
Autores: Bidau,Claudio J.; Martí,Dardo A.
We studied the geographic variation of three morphometric characters in relation to body size in two South American grasshoppers (Acrididae), Dichroplus vittatus Bruner and D. pratensis Bruner to test Allen's rule in these ectotherms. Since both species follow the converse to Bergmann's rule owing to latitudinal and/or altitudinal variation in time available for growth and reproduction, geographic variation in body size proportions of protruding parts may obey to differential allometric growth in different geographic areas. Alternatively, it could reflect true Allenian variation related to thermoregulation. Body proportions were studied by correlation/regression analyses with geographic and climatic variables. In D. pratensis, body proportions increased...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Body proportion; Body size; Dichroplus; Geographic variation.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2008000400004

Geographic variation of Moenkhausia bonita (Characiformes: Characidae) in the rio de la Plata basin, with distributional comments on M. intermedia
Provedor de dados: 83
Autores: Vanegas-Ríos,James Anyelo; Britzke,Ricardo; Mirande,Juan Marcos.
ABSTRACT Moenkhausia bonita occurs in numerous additional localities from the Bermejo, Paraná, Paraguay, and Uruguay river basins. Given that this finding greatly expands the distributional range of M. bonita, we carried out an intraspecific comparison, using multivariate methods for 18 morphometric and eight meristic characters taken from a comprehensive sample of 536 specimens. All localities were distributed in four major geographic groups as follows: Bermejo, Paraná, Paraguay, and Uruguay. Results of the morphometric comparisons showed significant differences among the studied groups except between the Paraguay and Uruguay groups. Statistical differences in meristic values were found for most between-group comparisons, especially in those resulting...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Argentina; Moenkhausia; Morphological variation; Widespread species.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000100202

An osteometric approach to reconstruct the length and weight of Lutjanus argentiventris (Perciformes: Lujtanidae) for archaeological and ecological purposes
Provedor de dados: 83
Autores: Martínez-Polanco,María Fernanda; Béarez,Philippe.
ABSTRACT Lutjanus argentiventris presents a large intertropical distribution within the Eastern Pacific, which is as important to fisheries now as it was in the pre-Hispanic period. The purpose of this article is to present an allometric model that enables the size and weight of L. argentiventris to be predicted, using the isolated bones found in archaeological and paleontological contexts or the stomach contents of ichthyophagous species. A modern collection of L. argentiventris from Ecuador was used, composed of 37 individuals covering a wide range of sizes and weights. The total length (TL), standard length (SL), and total fresh weight (W) of each individual was gathered. The TL of the sample ranged between 210 and 760 mm, the SL between 164 and 627 mm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Ichthyoarchaeology; Osteometry; Tropical Eastern Pacific; Length-weight relationship.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000300201

Is whole-plant photosynthetic rate proportional to leaf area? A test of scalings and a logistic equation by leaf demography census.
Provedor de dados: 19
Autores: KOYAMA, Kohei; KIKUZAWA, Kihachiro; 小山, 耕平.
Allometric scalings and a logistic equation assume that whole-plant photosynthetic rate under resource-unlimited conditions is proportional to leaf area. We tested this proportionality for the herb Helianthus tuberosus. During growth, we repeatedly measured the percentage of leaves with high, medium, and low photosynthetic capacity to estimate the whole-plant sum of photosynthetic capacity. We found that the whole-plant sum of the light-saturated photosynthetic rate of leaves is proportional to the whole-plant leaf area, disregarding the dynamics of the leaf population. We also found that the daily photosynthesis of each leaf appeared as a linear function of the light-saturated photosynthetic rate of that leaf, as predicted by the optimization theory....
Palavras-chave: Metabolic scaling theory; Whole‐plant photosynthesis; Allometry; Leaf demography; Logistic equation; Helianthus tuberosus (Jerusalem artichoke).
Ano: 2009
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4369

A lognormal distribution of the lengths of terminal twigs on self-similar branches of elm trees
Provedor de dados: 19
Autores: Koyama, Kohei; Yamamoto, Ken; Ushio, Masayuki.
Lognormal distributions and self-similarity are characteristics associated with a wide range of biological systems. The sequential breakage model has established a link between lognormal distributions and self-similarity and has been used to explain species abundance distributions. To date, however, there has been no similar evidence in studies of multicellular organismal forms. We tested the hypotheses that the distribution of the lengths of terminal stems of Japanese elm trees (Ulmus davidiana), the end products of a self-similar branching process, approaches a lognormal distribution. We measured the length of the stem segments of three elm branches and obtained the following results: (i) each occurrence of branching caused variations or errors in the...
Palavras-chave: Allometry; Fractal; Phenotypic plasticity; Shoot size; Stochastic process; WBE theory.
Ano: 2017
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4577

Relation taille–masse, condition relative et cycle sexuel des anchois et des sardines des côtesTunisiennes
Provedor de dados: 20
Autores: Khemiri, S.; Gaamour, A.
La biologie reproductive, la relation taille-masse ainsi que la condition relative de l’anchois Engraulis encrasicolus et de la sardine Sardina pilchardus ont été étudiées le long des régions Nord, Golfe de Tunis, la région Est et la région Sud des côtes tunisiennes durant la période 2000-2002.  Pour l’anchois et la sardine, la sex-ratio globale pour toutes les côtes tunisiennes est voisine de 1,0. L’acquisition de la taille de première maturité sexuelle semble être influencée par la température de l’eau dans les quatre régions. Les périodes de reproduction ont lieu dans les quatre régions d’avril à octobre pour l’anchois et d’octobre à mars pour la sardine. Dans les eaux tunisiennes, l’anchois et la sardine ont une allométrie majorante et une condition...
Tipo: Journal Contribution
Palavras-chave: Allometry; Condition factor; Length-weight relationships; Marine fish; Sex ratio; Sexual maturity; Sexual reproduction; Spawning seasons; Marine fishes.
Ano: 2009
URL: http://hdl.handle.net/1834/4487

Relative growth and population dynamics of Macrobrachium iheringi (Decapoda, Palaemonidae)
Provedor de dados: 84
Autores: Nogueira,Caio dos Santos; Perroca,Júlia Fernandes; Piantkoski,Emerson Luiz; Costa,Rogerio Caetano da; Taddei,Fabiano Gazzi; Fransozo,Adilson.
Abstract During the ontogenetic development of crustaceans, the relative growth of some structures may change, especially during the transition from juvenile to adult. This study describes the relative growth of body structures of Macrobrachium iheringi, and provides information on its population dynamics, such as structure, fecundity, and morphological sexual maturity. The sampling of M. iheringi was carried out in “Ribeirão da Hortelã”, in Botucatu (SP, Brazil). The length of the carapace (CL), abdomen (AL), and ischium (IL), merus (ML), carpus (CrL), propodus (PpL), and dactyl (DcL) of the second right pereopod were measured. In addition, the width of the second abdominal pleura (PW) and propodus height (PpH) were included in analyses. The relationships...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Freshwater; Caridea; Populations; Sex-ratio.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492019000100208

Growth curves of meat-producing mammals by von Bertalanffy’s model
Provedor de dados: 86
Autores: Fernandes,Felipe Augusto; Fernandes,Tales Jesus; Pereira,Adriele Aparecida; Meirelles,Sarah Laguna Conceição; Costa,Adriano Carvalho.
Abstract: The objective of this work was to evaluate how the parameterization and the application of different allometric values affect the obtention of the most adequate fit of von Bertalanffy’s model, in the description of the growth curve of meat-producing mammals (bovine, pigs, rabbits, and sheep). Among the nonlinear models, von Bertalanffy’s has been very often applied in several areas, with different parameterizations. This model has been commonly used with an allometric value of m = 2/3; however, for mammals, it is believed that this value can be m = 3/4. The analyzed data referring to the mass of meat-producing mammals according to their age were obtained from research institutions and from the literature. The results showed that von Bertalanffy’s...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Modeling; Nonlinear model; Parameterization; Regression.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000104307

Linking relative growth rates to biomass allocation: the responses of the grass Leymus chinensis to nitrogen addition
Provedor de dados: 85
Autores: Li,YY; Lü,X-T; Wang,Z-W; Zhou,C; Han,X-G.
Relative growth rate (RGR) of plants is a key component of fitness. Theoretically, the RGR of plants would be closely related with biomass allocation. Our mechanistic understanding of the relationship between RGR and biomass allocation under global change scenarios is still limited. We examined the responses of RGR and biomass allocation of Leymus chinensis, a dominant grass in the temperate steppe of northern China, to a wide range of N addition. We found that N addition increased RGR of L. chinensis up to a threshold of 10 g N/m². While leaf and stem weight ratios were positively correlated with N addition rates, root weight ratio showed a negative correlation. The RGR of total biomass was positively correlated with both leaf and stem weight ratios, but...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant functional traits; Nitrogen deposition; Growth dynamics; Temperate steppe; Allometry.
Ano: 2014
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572014000200008

Fitomassa epigéa da mata ciliar do rio Mogi-Guaçu, Itapira - SP
Provedor de dados: 88
Autores: MOREIRA-BURGER,DÉBORAH; DELITTI,WELINGTON B. C.
Este trabalho teve como objetivos estimar a fitomassa epigéa da mata ciliar do rio Mogi-Guaçu e determinar a melhor equação preditiva da fitomassa arbórea. O trabalho foi realizado num fragmento de mata localizado no município de Itapira - SP (22°21'S e 46°51'W). Foram delimitadas 12 parcelas de 25 m², para determinação da fitomassa através do método destrutivo. Os indivíduos arbóreos foram identificados e cortados ao nível do solo. De cada árvore, foram tomadas medidas de perímetro basal e altura. As folhas foram separadas manualmente dos ramos para determinação do peso fresco da porção foliar e lenhosa. A vegetação herbácea-arbustiva, de porte inferior a 1,3 m, existente em 3 m² de cada parcela, foi cortada ao nível do solo e tomadas as medidas de peso...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Biomass; Gallery forest.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041999000300011

Growth and leaf demography of two Cecropia species
Provedor de dados: 88
Autores: SANTOS,FLAVIO A.M.
Allometry, growth and leaf demography of two Cecropia species, one with ant mutualist (C. glazioui) and another without it (C. hololeuca), were studied in an Atlantic Rain Forest area in the State of Rio de Janeiro, SE Brazil. Stem diameter was allometrically related to height in both species. Cecropia glazioui showed higher annual growth rates and longer internodes than C. hololeuca. Leaf phenology showed a seasonal pattern in both species, but the number of leaves on each plant was more variable along the year in C. hololeuca than in C. glazioui. Survivorship curves for leaves were intermediate between Deevey's Type I and Type II curves, with young leaves of C. glazioui showing a greater survival rate and life expectancy than those of C. hololeuca. Low...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Atlantic Rain Forest; Cecropia; Growth; Leaf demography.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042000000200003

Biomass and mineralmass estimates in a "cerrado" ecosystem
Provedor de dados: 88
Autores: Delitti,Welington Braz Carvalho; Meguro,Marico; Pausas,Juli Garcia.
This work aimed to develop allometric equations for tree biomass estimation, and to determine the site biomass in different "cerrado" ecosystems. Destructive sampling in a "campo cerrado" (open savanna) was carried out at the Biological Reserve of Moji-Guaçu, State of São Paulo, southeastern Brazil. This "campo cerrado" (open savanna) grows under a tropical climate and on acid, low nutrient soils. Sixty wood plants were cut to ground level and measurements of diameter, height and weight of leaves and stems were taken. We selected the best equations among the most commonly used mathematical relations according to R² values, significance, and standard error. Both diameter (D) and height (H) showed good relationship with plant biomass, but the use of these...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Carbon; Cerrados; Nutrient; Savannas.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042006000400003

Relative growth, sexual dimorphism and morphometric maturity of Trichodactylus fluviatilis (Decapoda: Brachyura: Trichodactylidae) from Santa Terezinha, Bahia, Brazil
Provedor de dados: 103
Autores: Silva,Tiago Rozário da; Rocha,Sérgio Schwarz da; Costa Neto,Eraldo Medeiros.
Freshwater crabs are important elements in the aquatic biota of brooks, rivers, lakes and ponds, from both ecological and the socio-economic aspects. Trichodactylidae comprises 51 endemic species from the Neotropical region. Among all the species of this family, Trichodactylus fluviatilis Latreille, 1828 has the widest geographic distribution throughout Brazil. Despite that, there are few published contributions on the biology of this species. The present study investigated the following aspects of T. fluviatilis: relative growth, mean size at onset of morphometric maturity, sexual dimorphism, laterality and heterochely. Specimens were collected monthly from September 2010 through August 2011, from the Velha Eugênia Brook, municipality of Santa Teresinha,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Chelipeds; Crabs; Maturity size; Serra da Jibóia.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000100003

Evolution of bill size in relation to body size in toucans and hornbills (Aves: Piciformes and Bucerotiformes)
Provedor de dados: 103
Autores: Hughes,Austin L.
Evidence that the bill of the Toco Toucan, Ramphastos toco Statius Muller, 1776, has a specialized role in heat dissipation suggests a new function for the large and light-weight bill of the toucan family (Piciformes: Ramphastidae). A prediction of this hypothesis is that bill length in toucans will increase with body mass at a rate greater than the isometric expectation. This hypothesis was tested in a phylogenetic context with measurements of skeletal elements in adult males of 21 toucan species. In these species, 64.3% of variance in relative skeletal measurements was accounted for by the contrast between bill and body size. Maxilla length and depth increased with body mass at a greater than isometric rate relative to both body mass and other linear...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Heat dissipation; Ramphastidae.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000300007

Size-mass relationships of Melanoides tuberculatus (Thiaridae: Gastropoda) in a eutrophic reservoir
Provedor de dados: 103
Autores: Silva,Eduardo Carvalho; Molozzi,Joseline; Callisto,Marcos.
This study evaluated the relationships of certain allometric measurements in Melanoides tuberculatus Muller, 1774, in order to develop a statistical model to estimate the biomass of this mollusc species. We measured the total length and aperture of 70 shells. These measurements were correlated with the biomass values to construct exponential and power-function models, and both models showed high coefficients of determination. The exponential model was the better biomass predictor, with a coefficient of determination over 93%. These proposed models may be an effective tool to determine the biomass of M. tuberculatus in eutrophic Brazilian reservoirs.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Dry mass; Eutrophication; Molluscs.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000500004

Description of growth and body composition of freshwater angelfish (Pterophyllum scalare) by Gompertz model
Provedor de dados: 96
Autores: Espitia-Manrique,Carmen Helena; Fernandes,João Batista Kochenborger; Sakomura,Nilva Kazue; Arias-Vigoya,Ángel Andrés; Nascimento,Thiago Matias Torres do; Silva,Edney Pereira da; Mansano,Cleber Fernando Menegasso.
ABSTRACT The objective of this study was to describe the growth of freshwater angelfish (Pterophyllum scalare) using the Gompertz model, determining the relative growth and allometric coefficients of body components in relation to body weight and protein weight. Six hundred animals were grown until 233 days of age. Data on chemical composition (water, lipid, protein, and ash) and weight measurements were obtained each 30 days. The Gompertz growth equation was used to analyze chemical allometry and to estimate growth parameters. The relationship between chemical components and body protein was estimated. Protein and body weight increased proportionally, with ash being the earliest nutrient (209.2 days), while lipid deposition occurred later. Linear...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Growth curve; Ornamental fish.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000800631

Carcass quality, parts and tissue development of lambs finished in three systems
Provedor de dados: 96
Autores: Hashimoto,Juliano Hideo; Osório,José Carlos da Silveira; Osório,Maria Teresa Moreira; Bonacina,Marlice Salete; Lehmen,Rosilene Inês; Pedroso,Carlos Eduardo da Silva.
The objective of this study was to evaluate the effect of finishing systems on natural pasture and gender on the carcass quality, parts and tissue development of lambs. Forty-five non-castrated males and forty-five females were distributed in a completely randomized design into three treatments: lamb with mother kept on pasture; weaned lamb kept on pasture and weaned lamb kept on pasture with supplementation (soybean hulls at 1% of body weight). The criteria for slaughter was body condition score (2.0 - 3.0). The carcass characteristics and parts composition were influenced by the sex. The finishing system with supplementation promoted greater carcass yield and longer leg length. The tissue composition was different only for the sex, with the males...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Growth; Leg; Sheep; Shoulder; Tissue composition.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000200029

Light-related variation in sapling architecture of three shade-tolerant tree species of the Mexican rain forest
Provedor de dados: 97
Autores: MARTÍNEZ-SÁNCHEZ,JOSÉ LUIS; MEAVE,JORGE A; BONGERS,FRANS.
The crown architecture of three shade-tolerant tree species (two subcanopy and one mid-canopy) was analyzed in relation to the light regime of the forest understorey. The aim was to examine to which extent shade-tolerant species variate in their crown architecture. Tree saplings (265) between 50 and 300 cm height, and distributed from understorey to variously-sized canopy gaps, were measured for 13 architectural traits in the lowland rain forest of Los Tuxtlas, México. The analysis showed that the three species changed their architecture as light increased but in a different way. No species conformed to the typical wide-crown type expected for shade-tolerant species, and in contrast they presented some traits of light demanding species. The two sub-canopy...
Tipo: Journal article
Palavras-chave: Actinometry; Allometry; Growth type; Phenotypic plasticity; Tree morphology.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000300005

Ontogenetic variation in light interception, self-shading and biomass distribution of seedlings of the conifer Araucaria araucana (Molina) K. Koch
Provedor de dados: 97
Autores: LUSK,CHRISTOPHER H; FALSTER,DANIEL S; PÉREZ-MILLAQUEO,MANUEL; SALDAÑA,ALFREDO.
One of the factors thought to contribute to ontogenetic declines in plant growth rates is diminishing light interception efficiency, as a result of the difficulties of avoiding self-shading among a growing number of leaves, and by stems. The effects of plant size on self-shading and light interception have rarely been quantified, however. We used a three-dimensional digitising system to construct virtual models of the architecture of Araucaria araucana seedlings 71 to 358 mm tall, and modelled their light interception in the forest understorey using the program YPLANT. We also analyzed seedling allometry, to determine the combined effects of biomass distribution and self-shading on total light interception. Average light interception efficiencies...
Tipo: Journal article
Palavras-chave: Allocation; Allometry; FLORADIG; Leaf area ratio; Virtual plants; YPLANT.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000300004

Body mass and body weight: a dual reference system in biology
Provedor de dados: 97
Autores: GÜNTHER,BRUNO; MORGADO,ENRIQUE.
ABSTRACT The aim of the present study was to compare two different biological similarity criteria, one was based on body mass (M) as a theoretical reference system in accordance with the MLT-system of physics, while the other utilized the body weight (W) for the same purpose. The mass-dependent allometry should be applied during space flights as well as during fetal and newborn conditions of life, whereas the weight-dependence should prevail in earth-bound physiology. The above mentioned distinctions are relevant not only for the specific metabolic rates but also for numerous biological time functions, as for instance for the heart and respiratory rates of all mammals, whose allometric exponent is b = - 0.09 during fetal life, and b = - 0.25 in all adult...
Tipo: Journal article
Palavras-chave: Dimensional analysis; Biological similarity; Allometry; Biological time; Fetal life; Space physiology.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000100006

Morphometric variation in island and mainland populations of two lizard species from the Pacific Coast of Mexico
Provedor de dados: 97
Autores: Hernández-Salinas,Uriel; Ramírez-Bautista,Aurelio; Pavón,Numa P; Rosas Pacheco,Luis F.
BACKGROUND: Body size exerts a strong influence on the physiology, morphology, ecology, and evolution of other life history traits in vertebrates. We compared the morphometry and allometry of two lizard species (Anolis nebulosus and Aspidoscelis lineattissima) occurring on mainland and island populations on the Pacific Coast of Mexico in order to understand the effect of an insular environment on body size and other morphometric structures. RESULTS: Results showed that both males and females of A. nebulosus from San Pancho Island were larger in body size than those from the mainland. Moreover, males of A. lineattissima from Cocinas Island exhibited larger forms of most measured morphometric traits than those from the mainland, whereas females from both...
Tipo: Journal article
Palavras-chave: Allometry; Anolis nebulosus; Aspidoscelis lineattissima; Islands; Evolution; Sexual dimorphism.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100018

Growth curves of body weight and nutrient deposition and protein requirements for light and semi-heavy pullets
Provedor de dados: 22
Autores: Silva, José Humberto Vilar da; Filho, José Jordão; Silva, Edson Lindolfo da; Costa, Fernado Guilherme Perazzo; Naves, Patricia Emília Givisiez; Figueiredo-Lima, Denise Fontana; de Siqueira, Jefferson Costa; Lima, Rodrigo Barbosa.
Growth curves of pullets were adjusted to describe the deposition rates of body components and estimate the requirements in protein. Altogether 1500 poultry were randomly distributed in 30 repetitions of 25 birds. The experimental period was divided into four stages (1 to 4 weeks 5 to 11 weeks and 12 to 16 weeks old). The rations formulated based on corn and soybean meal were offered the will. Weekly, pullets were heavy and two birds separates by lineage to be in determining chemical composition of body nutrients. The informations was used to obtain the parameters of the Gompertz model. Allometric relationships were used to describe the changes in body composition in protein, lipid, ash and water in the body gutted and without feathers. The data of body...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Bovans Goldline; Body chemical composition; Dekalb White; Modelling.
Ano: 2017
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/14006

Biomass equations for forest regrowth in the eastern Amazon using randomized branch sampling
Provedor de dados: 36
Autores: Ducey,Mark Jonathan; Zarin,Daniel Jacob; Vasconcelos,Steel Silva; Araújo,Maristela Machado.
Forest regrowth occupies an extensive and increasing area in the Amazon basin, but accurate assessment of the impact of regrowth on carbon and nutrient cycles has been hampered by a paucity of available allometric equations. We develop pooled and species-specific equations for total aboveground biomass for a study site in the eastern Amazon that had been abandoned for 15 years. Field work was conducted using randomized branch sampling, a rapid technique that has seen little use in tropical forests. High consistency of sample paths in randomized branch sampling, as measured by the standard error of individual paths (14%), suggests the method may provide substantial efficiencies when compared to traditional procedures. The best fitting equations in this...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Allometric equations; Secondary growth; Tropical forest.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672009000200013

Length-weight relationship and condition factor for twelve fish species from the Igarapé Fortaleza basin, a small tributary of the Amazonas River estuary
Provedor de dados: 36
Autores: OLIVEIRA,Marcos Sidney Brito; SILVA,Luís Maurício Abdon; PRESTES,Luiza; TAVARES-DIAS,Marcos.
ABSTRACT Length and weight data are useful in fisheries management and standard results of fish monitoring programs. Length-weight relationship (LWR) is used for estimating the weight corresponding to a given length, and the condition factor is used to compare the body condition, fatness or health of fish populations. This study aimed to estimate the LWR and the condition factor for 12 freshwater fish species from the Igarapé Fortaleza basin, a tributary of the Amazonas River system in the State of Amapá, eastern Amazon (Brazil). The coefficient of determination, the allometric condition factor and the allometric coefficient varied among species, and were compared with populations elsewhere. In 83.3% of the species, the allometric coefficient remained...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Allometry; Brazil; Freshwater fish; Growth pattern.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672020000100008

Allometric models to estimate tree height in northern Amazonian ecotone forests
Provedor de dados: 36
Autores: BARBOSA,Reinaldo Imbrozio; RAMÍREZ-NARVÁEZ,Perla Natalia; FEARNSIDE,Philip Martin; VILLACORTA,Carlos Darwin Angulo; CARVALHO,Lidiany Camila da Silva.
ABSTRACT Allometric models defining the relationship between stem diameter and total tree height in the Amazon basin are important because they refine the estimates of tree carbon stocks and flow in the region. This study tests different allometric models to estimate the total tree height from the stem diameter in an ecotone zone between ombrophilous and seasonal forests in the Brazilian state of Roraima, in northern Amazonia. Stem diameter and total height were measured directly in 65 recently fallen trees (live or dead). Linear and nonlinear regressions were tested to represent the D:H relation in this specific ecotone zone. Criteria for model selection were the standard error of the estimate (Syx) and the adjusted coefficient of determination (R²adj),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Amazon forest; Hypsometric relationships; Dendrometry; Seasonal forest.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672019000200081

Close relationship between diameters at 30cm height and at breast height (DBH)
Provedor de dados: 36
Autores: Gehring,Christoph; Park,Soojin; Denich,Manfred.
This paper proposes the establishment of a second diameter measuring standard at 30cm shoot extension ('diam30') as input variable for allometric biomass estimation of small and mid-sized plant shoots. This diameter standard is better suited than the diameter at breast height (DBH, i.e. diameter at 1.30m shoot extension) for adequate characterization of plant dimensions in low bushy vegetation or in primary forest undergrowth. The relationships between both diameter standards are established based on a dataset of 8645 tree, liana and palm shoots in secondary and primary forests of central Amazonia (ranging from 1-150mm dbh). Dbh can be predicted from the diam(30) with high precision, the error introduced by diameter transformation is only 2-3% for trees...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Measuring standard; Amazonia; Biomass estimation; Thin shoots.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672008000100008

Ontogeny, allometry and architecture of Psychotria tenuinervis (Rubiaceae)
Provedor de dados: 39
Autores: Rosseto,Vanessa; Carneiro,Magda Silva; Ramos,Flavio Nunes; Santos,Flavio Antonio Maës dos.
We evaluated the ontogeny of the understory shrub Psychotria tenuinervis Müll.Arg., considering morphological and morphometric characters. Four ontogenetic stages were identified: seedling, juvenile, immature and adult (vegetative and reproductive phases). Size measurements and allometric relationships of the stem and crown were compared between the immature and adult stages. Diameter and total height of the stem, as well as crown depth and width, increased throughout the ontogenetic stages and differed among immature, vegetative adult and reproductive adult individuals. The number of branches was lower in immature individuals than in vegetative and reproductive adult individuals but did not differ between the last two. The bifurcation ratio did not vary...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Architecture; Branching pattern; Ontogenetic stages; Understory.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000400012

Size-dependent allocation of biomass to ancillary versus flowers of the inflorescences of the epiphyte Tillandsia stricta Soland (Bromeliaceae)
Provedor de dados: 39
Autores: Mantovani,André; Iglesias,Ricardo Rios.
The amount of resources invested in reproduction is closely correlated to plant size. However, the increase in reproductive investment is not always proportional to the increase in vegetative growth, as the proportion of plant resources allocated to reproduction can increase, decrease or be maintained along different plant sizes. Although comprising thousand of species, epiphytes are poorly studied in relation to reproductive allocation (RA). We describe the variation in the RA of the epiphytic bromeliad Tillandsia stricta Soland with increasing plant sizes. Our goal is not only to evaluate the RA of the whole inflorescence but also quantify the contribution of ancillary structures in the final RA of this plant species. With increasing sizes of T. stricta...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allocation; Allometry; Ancillary structures; Bromeliaceae; Tillandsia.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062009000100016

Ontogenetic shape changes and sexual dimorphism in Aegla marginata Bond-Buckup and Buckup, 1994
Provedor de dados: 42
Autores: ADAM,CAROLINA L.; MAROCHI,MURILO Z.; MASUNARI,SETUKO.
ABSTRACT A study on relative growth, sexual dimorphism and ontogenetic trajectory was carried out in a population of the aeglidAegla marginata coming from Barrinha River, Iguape River Basin, Tunas do Paraná, Paraná State, Brazil. The size the of morphological sexual maturity was estimated for males and females. The analysis of sexual dimorphism and ontogenetic trajectory were performed using geometric morphometric technique. Males reach maturity with 10.58 mm of carapace length (CL) and females with 10.38 mm CL. Sexual size dimorphism was only visible among adults, with males reaching larger sizes. This is probably related to the reproductive strategy of males. However, sexual shape dimorphism was found for both juveniles and adults: the posterior region...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Relative growth; Sexual dimorphism; Shape.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401521

Population structure of Rudgea parquioides (Rubiaceae), a shade-tolerant shrub species, in Southern Brazil
Provedor de dados: 42
Autores: Cardoso,Fernanda C.G.; Salvalaggio,Ana P.B.; Marques,Márcia C.M.
The expectations that shade-tolerant forest species show 1) a population structure composed by a high amount of small individuals, and 2) biomass allocation for diameter higher than for height growth, were tested for Rudgea parquioides, a typical shrub in Southern Brazil. We described the size structure (height and stem diameter) and allometrical relations of a R. parquioides population by counting and measuring all the individuals in a 725m² area in the municipality of Curitiba (25"25'S; 49"19'W). A total of 916 individuals (12,634 ind.ha-1) were recorded in the area. The firstexpectation was supported, since distribution by height and diameter classes showed a predominance of small individuals (skewness coefficients &amp;gt; 1). On the other hand, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Araucaria forest; Size distribution; Subtropical forest; Understorey.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300011

Dendrometry and litterfall of neotropical pioneer and early secondary tree species
Provedor de dados: 49
Autores: Benvenuti-Ferreira,Glaci; Coelho,Geraldo Ceni; Schirmer,Jorge; Lucchese,Osório Antônio.
The increased forest cover loss in the tropical and subtropical regions has stimulated the development of restoration methods through tree plantations. Based on the successional model of forest development the use of different successional groups can be seen as a strategy to accelerate the re-composition of forests and an attempt to recover ecological conditions prior to disturbance. Tree species have particular growth rates and ecological needs, and this knowledge is important in the development of high diversity models of forest restoration. The objective of this study was to compare the initial growth and litterfall of native pioneer versus early secondary tree species in a mixed plantation system, and to determine the relationships between guilds and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Restoration ecology; Secondary succession; Allometry; Successional guilds.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032009000100008

Reproduction and growth in a Neotropical arboreal mouse: Oecomys rutilus (Sigmodontinae: Cricetidae) in French Guiana
Provedor de dados: 49
Autores: Catzeflis,François.
Abstract: Postnatal growth and development of the small Neotropical mouse Oecomys rutilus (Sigmodontinae: Cricetidae) were investigated from birth to day 143, in the laboratory. Morphometric measurements at age of 3 days, of both sexes combined, revealed body weight to be 3.4 ± 0.3 g, mean tail length as 27.4 ± 1.1 mm, and mean hind foot length as 9.3 ± 0.7 mm. Body weight was found to increase steadily until at least 69 days, whereas the instantaneous growth rates of other measurements declined earlier: the daily growth of hind foot length declined to a minimum at age of 24 days, and the growth of tail and of ear declined by the age of 33 days. Average litter size for 12 captive births was 2.5, ranging from 2 to 3. The preserved eye crystalline lens was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Gompertz model; Rodents; Eye-lens weight; Life history.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000200207

Length-weight and length-length relationships for rockpool fishes on the Brazilian coast
Provedor de dados: 49
Autores: Machado,Fabiola Seabra; Oliveira,Rory Romero de Sena; Silva,Arianderson Texeira; Giarrizzo,Tommaso.
Abstract Fifty-nine length-weight (LWR) and length-length (LLR) relationships were estimated for 18 fish species, belonging to 10 families. The fish specimens were captured in rockpools of 21 sites along a stretch of 4,900 km of the Brazilian coast, between latitudes 00° and 22°S, in 2012. This study represents the first reference available for five fish species (Gobiesox barbatulus, Bathygobius geminatus, Labrisomus nuchipinnis, Malacoctenus delalandii, Lutjanus alexandrei) in LLR and six (Gobiesox barbatulus, Bathygobius geminatus, Hypleurochilus fissicornis, Omobranchus punctatus, Entomacrodus vomerinus, Diplodus argenteus) in LWR.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Intertidal fish; Tidepool; Allometry.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032017000300502

Allometric models for estimating the phytomass of a secondary Atlantic Forest area of southeastern Brazil
Provedor de dados: 49
Autores: Burger,Déborah Moreira; Delitti,Welington Braz Carvalho.
The purpose of this study was to develop and validate equations to estimate the aboveground phytomass of a 30 years old plot of Atlantic Forest. In two plots of 100 m², a total of 82 trees were cut down at ground level. For each tree, height and diameter were measured. Leaves and woody material were separated in order to determine their fresh weights in field conditions. Samples of each fraction were oven dried at 80 °C to constant weight to determine their dry weight. Tree data were divided into two random samples. One sample was used for the development of the regression equations, and the other for validation. The models were developed using single linear regression analysis, where the dependent variable was the dry mass, and the independent variables...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass; Allometry; Carbon; Secondary Atlantic Forest; Forest biomass estimation.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032008000400012

Studies on the morphometry of Macrobrachium nobilii (Decapoda, Palaemonidae)
Provedor de dados: 52
Autores: Mariappan,Pitchaimuthu; Balasundaram,Chellam.
Fourteen morphometric characters of Macrobrachium nobilii (Henderson and Matthai, 1910), a freshwater prawn were measured from 72 males and 66 females collected at random in field. The growth constant (b) of total length and weight for male (4.28) and female (3.02) differed significantly (P&lt;0.05). Comparison of slopes and elevations of regressions between sexes indicated significant difference in all the studied dependent parameters with carapace length (X), except with carapace width (Y). In males, major and minor chelipeds showed positive allometry while in females the growth was isometric.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Cheliped freshwater prawn length-weight Macrobrachium nobili.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000300015

Influence of planting methods on root development, crop productivity and water use efficiency in maize hybrids
Provedor de dados: 117
Autores: B. Khan,Muhammad; Yousaf,Farhan; Hussain,Mubshar; W. Haq,Muhammad; Lee,Dong-J; Farooq,Muhammad.
Optimum planting methods better ensure water and nutrient supply through improved root development resulting in better crop growth and productivity. This study was conducted to evaluate the effects of planting methods on root development, crop allometry, water use efficiency (WUE), productivity and economic returns of different maize (Zea mays L.) hybrids. Maize hybrids NK-6621, Pioneer-30Y87, and Pioneer-30Y58 were sown on beds, ridges, and flat surface. Ridge sowing was better followed by bed sowing; while amongst the hybrids, 'Pioneer-30Y87' performed the best. Well-developed root system, with longer primary root, more number of lateral roots and higher root growth rate, was observed in 'Pioneer-30Y87' planted on ridges, which led to higher WUE, grain...
Tipo: Journal article
Palavras-chave: Allometry; Planting methods; Root growth rate; Water use efficiency.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000400015

Allometric growth of non-carcass components in crossed lambs
Provedor de dados: 65
Autores: Garcia,Iraides Ferreira Furusho; Alvarenga,Tharcilla Isabella Rodrigues Costa; Perez,Juan Ramon Olalquiaga; Almeida,Amelia Katiane de; Gallo,Sarita Bonagurio; Pereira,Idalmo Garcia; Alves,Nadja Gomes; Alvarenga,Flávio Augusto Pereira.
Males and females, including purebred Santa Inês lamb (SI) and crosses between Santa Inês dams and Texel (TxSI), Ile de France (IFxSI) and Bergamasca (BxSI) sires were feedlot finished and slaughtered at 15, 25, 35 and 45kg live weight. After slaughter, the following non- carcass components were weighed and calculated the allometric growth. Lungs of BxSI males grew faster than those of SI and TxSI. Trachea/esophagus in SI and TxSI males grew slower than IFxSI and BxSI. Kidneys BxSI males grew faster than TxSI and IFxSI. Livers of female TxSI lamb grew more rapidly than those of females in the other genetic groups. In both males and females, the rumen/reticulum grew faster in the TxSI group than SI and BxSI groups.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Growth; Crossbreed; Body development; Sheep.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014000701229