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| Yoshida, Grazyella Massako; Oliveira, Carlos Antonio Lopes de; Kunita, Natalí Miwa; Rizzato, Gabriel Soriani; Alexandre Filho, Luiz; Ribeiro, Ricardo Pereira. |
| Co(variance) components and genetic parameters were estimated for performance and morphometric traits in male and female Nile tilapia at different growth periods to verify the need for separate selection programs for the two genders. Data set contained information on 1,720 animals, collected in cage system. Two-trait analyses using Bayesian methodology were conducted and the records of males and females were considered distinct traits. Rates of additive genetic variance, phenotypic and heritability were higher for females in estimates for morphometric traits and higher for males in performance traits. Whereas common hatchery environment showed higher relative importance for males, the nursery caused greater variations in females. The reduction of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.04.02.00-5 Oreochromis niloticus; Sexual dimorphism; Bayesian inference.. |
| Ano: 2015 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/25978 |
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| EISFELD,ALEXIA; VRCIBRADIC,DAVOR. |
| Abstract: We analyzed some aspects of reproduction and sexual dimorphism of the semi-aquatic dipsadid snake Erythrolamprus miliaris in the state of Rio de Janeiro, southeastern Brazil. We detected sexual dimorphism in body size (snout-vent length), with females averaging larger than males, but no sexual dimorphism in the relative length of the tail. Oviductal eggs and secondary follicles were found in all seasons, suggesting that female reproductive cycles are continuous, in spite of the tropical seasonal climate in the region. Reproductive males were present throughout the year, suggesting a continuous cycle for males as well. Clutch size averaged 10.3 ± 4.8 (range 4-21) and there was a positive and significant relationship between clutch size and female... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atlantic Forest; Reproduction; Sexual dimorphism; Squamata. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100632 |
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| 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 |
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| Araújo,Marina S.L.C.; Barreto,Aline V.; Negromonte,Aurinete O.; Schwamborn,Ralf. |
| This paper aims at describing the population ecology of the swimming crab Callinectes danae Smith, 1869 in one of the most productive estuaries of Brazil, the Santa Cruz Channel. These crabs were monthly collected from January to December/2009 at four stations along the channel, two in the upper and two in the lower estuary. A total of 2373 specimens of C. danae were collected during the study. Males had a larger average carapace width than non-ovigerous females (60.0 ± 15.6 mm and 52.9 ± 12.4 mm, respectively), an adaptation that gives greater protection for females during the copulation. Overall sex ratio did not differ significantly from 1:1. However, evaluating sex-ratio by sampling area, males and juveniles of both sexes occurred preferentially in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brachyura; Population biology; Santa Cruz Channel; Sexual dimorphism. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100013 |
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| Motta-Tavares,Tatiana; Maia-Carneiro,Thiago; Dantas,Leonardo F.; Sluys,Monique Van; Hatano,Fábio H.; Vrcibradic,Davor; Rocha,Carlos F.D.. |
| In this study, we analyzed diet, sexual dimorphism and bromeliad use in three populations of the hylid frog Phyllodytes luteolus from restinga habitats along the Brazilian coast. We found 13 arthropods categories in 161 stomachs. Ants and termites were the dominant prey items. The similar trophic niche across populations suggests this species has a conservative diet. We found sexual dimorphism regarding body size and jaw width. We recordedP. luteolus in five bromeliad species, but predominantly inAechmeablanchetiana (35.6% of individuals recorded). We recorded solitary individuals in 44% of occupied bromeliads, and never found two males sharing the same bromeliad. The data is suggestive that populations ofP. luteolus has a conservative diet independent of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atlantic forest; Bromeliad; Diet; Sexual dimorphism; Territorial behavior. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100093 |
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| COCO,LÍVIA; BORGES JÚNIOR,VITOR N.T.; FUSINATTO,LUCIANA A.; KIEFER,MARA C.; OLIVEIRA,JANE C.F.; ARAUJO,PABLO G.; COSTA,BIANCA M.; SLUYS,MONIQUE VAN; ROCHA,CARLOS F.D.. |
| Haddadus binotatus is an endemic anuran of the Brazilian Atlantic Forest and currently, there is no information about the diet of this species. We analyzed the diet of two populations of this anuran in two states in southeast Brazil. Samplings were carried out in 2004 in the state of Rio de Janeiro and in 2009 and 2010 in the state of Espírito Santo.Haddadus binotatus presented a rich diet composition, preying 19 prey types. Orthoptera, Coleoptera, and Blattodea were the most important preys in the Rio de Janeiro population, and Orthoptera, Araneae and Hemiptera were the most important in the Espírito Santo population. The diet composition differed numerically between the two localities, but not in terms of volume, which can reflect local differences in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Arthropods; Diet; Generalist feeder; Sexual dimorphism. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100239 |
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| Ferreira,Paulo Sérgio Fiuza; Pires,Evaldo Martins; Guedes,Raul Narciso Carvalho; Mendes,Márcio; Coelho,Lívia Aguiar. |
| A total of 293 specimens of Oxelytrum discicolle were sampled weekly over a period of two years using a black light trap. The study took place in an Atlantic Forest reserve located near Viçosa city, Minas Gerais State, Brazil. The period of peak abundance of O. discicolle occurred during the wet season between the months of October and March. Statistical analysis showed that the abundance of individuals was significantly and positively correlated with temperature, but not with rainfall or relative humidity. Of 28 morphological measurements taken on each collected specimen, seven were found to be sexually dimorphic; however, neither morphology nor the degree of sexual dimorphism varied significantly among seasons. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oxelytrum discicolle; Population dynamic; Sexual dimorphism; Minas Gerais. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032006000200015 |
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| Gava,A.L.; Freitas,F.P.S.; Meyrelles,S.S.; Silva,I.V.; Graceli,J.B.. |
| It is well known that the kidney plays an important role in the development of cardiovascular diseases such as hypertension. The normal aging process leads to changes in kidney morphology, hemodynamics and function, which increase the incidence of cardiovascular events in the elderly population. These disturbances are influenced by several factors, including gender. In general, females are protected by the effects of estrogens on the cardiorenal system. Several studies have demonstrated the beneficial effects of estrogens on renal function in the elderly; however, the relationships between androgens and kidney health during one’s lifetime are not well understood. Sex steroids have many complex actions, and the decline in their levels during aging clearly... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sexual dimorphism; Renal function; Aging; Cardiovascular disorders; Sex hormones. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011000900012 |
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| Machado,Renata F; Cerezer,Felipe O; Hendges,Carla D; Cáceres,Nilton C. |
| We evaluated several factors that might be related to the home-range size of felids at both inter and intraspecific levels. At the interspecific level, we tested the influence of body mass on home range size of 19 felid species, while controlling for phylogeny. At the species level, we evaluated the effect of sex and habitat type (open vs. closed) on the home range size of three species of felids occurring in America, Panthera onca, Leopardus pardalis and Puma concolor, which are among the most studied species concerning home ranges. Body mass, sex, and home range data were extracted from the Pantheria database (for 19 species, for interspecific comparisons) and from 48 studies for intraspecifc comparisons. We assessed the influence of body mass on the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pantera onca; Leopardus pardalis; Puma concolor; Sexual dimorphism; Body size; Environment; Territory. |
| Ano: 2017 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2017000300004 |
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| Vidal,Marcela A; Ortiz,Juan Carlos; Labra,Antonieta. |
| We studied sexual and geographic variation of color patterns in the lizard Liolaemus tenuis. We counted the number of scales with different colors in two body regions, in individuals of both sexes, from three groups of populations along a latitudinal range. Color patterns showed sexual and geographic variations; females and the northern group were the darkest. The selective pressures of these color pattern variations are unclear. However, considering that L. tenuis males are territorial and polygamous, we postulate that sexual variation in color would be consequence of sexual selection involving female choice and male-male interactions (e.g. agonistic displays among males). Geographic variation may be determined by predation pressure, as there is a... |
| Tipo: Journal article |
Palavras-chave: Chromatophores; Sexual dimorphism; Lizard; Liolaemus; Chile. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000100004 |
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| Rezende-Pinto,Fabíola M.; Verrastro,Laura; Zanotelli,Juliana C.; Barata,Paulo C. R.. |
| The reproductive cycle and sexual dimorphism of the lizard Cnemidophorus vacariensis Feltrim & Lema, 2000 were studied on the basis of data gathered between August 2004 and August 2006 in Vacaria, Rio Grande do Sul, Brazil. Snout-vent length (SVL) of sexually mature males varied between 48.8 and 72.9 mm (x = 63.3 ± 6.0 mm; n = 76) and, for females, between 57.4 and 81.8 mm (x = 70.0 ± 5.9 mm; n = 73). Other morphological characteristics were also compared between sexes. Reproduction was seasonal, and observations indicate two clutches in the same reproductive season. Clutch size and other reproductive characteristics were analyzed as well as the relation between reproduction and environmental factors. Cnemidophorus vacariensis is apparently endemic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Teiidae; Cnemidophorus vacariensis; Reproduction; Sexual dimorphism; Conservation. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212009000100012 |
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| Lira,José J. P. R.; Calado,Tereza C. S.; Araújo,Marina S. L. C.. |
| The condition factor is a parameter which acts as a general indicator of the "well-being" of a species, and it can be obtained through the analysis of width vs. weight relationships. The present work aims to investigate size vs. weight relationship and the condition factor of the crab Goniopsis cruentata (Latreille, 1803). The study area was the Mundaú/Manguaba estuarine complex, Maceió, state of Alagoas, Northeast Brazil. Samplings were monthly accomplished from August 2007 to July 2008. A total of 626 individuals were analyzed, being 309 males and 317 females. Males were larger and heavier than females, what is expected in many brachyuran. The growth was positive allometric to both males (b = 3.42) and females (b = 3.30), not obeying the "cube law". The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crab; Growth; Sexual dimorphism; Mangrove forest; Northeast Brazil. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212012000300006 |
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| Registros recuperados: 92 | |
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