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| Registros recuperados: 51 | |
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| 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 |
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| 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 |
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| 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 |
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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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| 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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| 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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| 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 |
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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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| 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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| 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 |
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| 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 |
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| Registros recuperados: 51 | |
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