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| Registros recuperados: 51 | |
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| 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 |
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| 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... |
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Palavras-chave: Allometry; Fractal; Phenotypic plasticity; Shoot size; Stochastic process; WBE theory. |
| Ano: 2017 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4577 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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– Prey; Random forest; Trophic network theory. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00661/77349/78823.pdf |
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| 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 |
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| Registros recuperados: 51 | |
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