Allometry
Mostrando 13-24 de 69 artigos, teses e dissertações.
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13. Growing straight versus growing decumbent: soil quality and allometry in Syagrus glaucescens Becc. (Arecaceae), an endemic and threatened palm of the Espinhaço Mountains, Brazil
ABSTRACTSyagrus glaucescens is an endemic palm found in the rupestrian grasslands of the Espinhaço Mountains in southeastern Brazil. It is highly associated with quartzitic soils and exhibits strong intra-specific morphological variation in the different areas where it occurs. Allometric traits were used to verify whether there are any significant differenc
Acta Bot. Bras.. Publicado em: 2015-09
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14. Population biology of the ‘uçá'-crab, Ucides cordatus(Linnaeus, 1763) (Brachyura: Ucididae), in mangroves of the Joanes River, Bahia State, Brazil
ABSTRACTThis study evaluated the population structure, relative growth and morphological maturity size in Ucides cordatus in the Joanes River, Bahia State (Brazil). Crabs were sampled in a fragmented and human-altered mangrove ecosystem in a Brazilian Environmental Protected Area (EPA). A total of 431 crabs were sampled (265 males and 166 females) between Se
Nauplius. Publicado em: 2015-06
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15. Shape and size variations of Aegla uruguayana (Anomura, Aeglidae) under laboratory conditions: A geometric morphometric approach to the growth
Crustacean growth studies typically use modal analysis rather than focusing on the growth of individuals. In the present work, we use geometric morphometrics to determine how organism shape and size varies during the life of the freshwater crab, Aegla uruguayana Schmitt, 1942. A total of 66 individuals from diverse life cycle stages were examined daily and e
Iheringia, Sér. Zool.. Publicado em: 2015-03
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16. Demography of the endangered tree species Ocotea porosa (Lauraceae) along a gradient of forest disturbance in southern Brazil
Ocotea porosa (Ness) Barroso (Lauraceae), a typical tree of the southern Atlantic Forest in Brazil, was heavily exploited for timber in the last century. With the aim of examining the status of the remaining populations, we surveyed five forest fragments in the state of Paraná, in southern Brazil, and evaluated whether disturbances caused by selective loggi
Acta Bot. Bras.. Publicado em: 2014-12
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17. Dimorphism and allometry of Systaltocerus platyrhinus and Hypselotropis prasinata (Coleoptera: Anthribidae)
Males of sexually dimorphic anthribid species display structural modifications that suggest sexual selection. Polyphenism, which is expressed through morphological and behavioral novelties, is an important component of the evolutionary process of these beetles. In this study, we endeavored to ascertain the presence of variations in selected monomorphic trait
Zoologia (Curitiba). Publicado em: 2014-02
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18. Ontogeny, allometry and architecture of Psychotria tenuinervis (Rubiaceae)
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 immatur
Acta Bot. Bras.. Publicado em: 2013-12
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19. Allometry as evidence of sexual selection in monochromatic birds: the case of the Coscoroba Swan (Anseriformes: Anatidae)
The Coscoroba Swan, Coscoroba coscoroba (Molina, 1782), is a poorly known aberrant Anserine endemic to South America. We captured adult birds (189 male, 157 female) from the largest population in Brazil at the Taim Ecological Reserve, State of Rio Grande do Sul, Brazil. Different patterns between sexes can reflect differences in selection, and positive allom
Zoologia (Curitiba). Publicado em: 2013-08
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20. Biologia populacional do poliqueta exogone (exogone) breviantennata Hartmann-Schröder, 1959 (Syllidae: Exogoninae) / Population biology of the polychaete exogone (exogone) breviantennata Hartmann-Schröder, 1959 (Syllidae: Exogoninae)
The study of the syllid Exogone (Exogone) breviantennata was conducted in two soft bottom beds of the mytilid Mytella charruana at Camaroeiro and Cidade beaches, located on the northern coast of São Paulo. To characterize the study areas, samples were taken monthly between february 2006 and february 2007 at Camaroeiro, and between april 2006 and april 2007
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2012
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21. Relações alométricas da Anomalocardia brasiliana (Gmelin, 1791) na praia de Mangue Seco, Pernambuco-Brasil.
A Anomalocardia brasiliana está entre os moluscos bivalves marinhos mais coletados em Pernambuco, região nordeste do Brasil, esse marisco é naturalmente encontrado principalmente no litoral norte, onde a pesca artesanal sempre foi uma atividade tradicional. O presente estudo teve como objetivo avaliar as relações alométricas no crescimento e peso do ma
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/02/2012
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22. Mecanismos de coexistência em florestas tropicais : variações ontogenéticas de arquitetura aérea, padrão espacial e performance de espécies congenéricas simpátricas em uma floresta tropical úmida de terras baixas / Coexistence mechanisms in tropical forests : ontogenetic variation in aboveground architecture, spatial patterns and performance of sympatric congeneric species in a lowland tropical rain forest
A alta diversidade em florestas tropicais tem motivado questionamentos sobre a importância da diferenciação de nicho como mecanismo de coexistência. Nessa hipótese, a heterogeneidade ambiental proporcionaria eixos de diferenciação que facilitariam a coexistência, sendo, portanto, esperadas diferenças entre espécies na associação a gradientes espa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/11/2011
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23. Estrutura populacional, crescimento somático e alométrico, biologia reprodutiva e estimativa do tamanho populacional de Aegla perobae Hebling &Rodrigues, 1977 do município de São Pedro, estado de São Paulo / Population structure, somatic and allometric growth, reproductive biology and population size estimation of Aegla perobae Hebling &Rodrigues, 1977 in São Pedro, São Paulo state
Aeglids are endemic to the neotropical South America. They are restricted to freshwaters, mainly occurring under rocks and fragmented leaves or buried in the sand (Burns, 1972; Rodrigues &Hebling, 1978; Swiech-Ayoub &Masunari 2001a) in lakes, rivers, streams and even rivers running into caves. The aeglids are important links in the food chain of freshwater e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/09/2011
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24. Fatores ambientais que afetam o desempenho ponderal e medidas corporais de cordeiros de diferentes grupos genéticos
O objetivo deste trabalho foi avaliar o desempenho ponderal e as medidas corporais de cordeiros de diferentes grupos genéticos de acordo com os efeitos ambientais (ano de nascimento, tipo de nascimento, sexo, idade e peso da mãe ao parto); testar regressões para predizer o peso vivo dos cordeiros por meio de medidas corporais; e descrever o tipo de cresci
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/03/2011