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Sex ratio is variable and increasingly male biased at two colonies of Magellanic Penguins
(Ecological Society of America. John Wiley & Sons Inc, 2020-03)
Sex ratios are commonly skewed and variable in wild populations, but few studies track temporal trends in this demographic parameter. We examined variation in the operational sex ratio at two protected and declining breeding ...
AUTOSOMAL SUPPRESSORS OF SEX-RATIO IN DROSOPHILA-MEDIOPUNCTATA
(Nature Publishing GroupLondonInglaterra, 1993)
The Influence of Alcohol Consumption in Conjunction with Sex Hormone Deficiency on Ca/P Ratio in Rats
(2016-01-01)
Deficiency of sex hormones and excessive alcohol consumption are factors that have been related to alterations in the pattern of bone mineralization and osteoporosis. The aim of this study was to evaluate possible alterations ...
Sexual size dimorphism and sexual selection in primates
(Wiley Blackwell Publishing, Inc, 2020-04)
In most animals, females are larger than males. Paradoxically, sexual size dimorphism is biased towards males in most mammalian species. An accepted explanation is that sexual dimorphism in mammals evolved by intramale ...
Reproductive pattern in the southernmost populations of South American redbelly toads
(Taylor & Francis, 2013-11)
Anurans can be classified as explosive or prolonged breeders. In species with short breeding periods, intensive competition for females is expected. We analyse the temporal breeding pattern of Melanophryniscus aff. ...
Different sperm allocation strategies in two populations of the semiterrestrial crab Neohelice granulata (Brachyura, Grapsoidea, Varunidae)
(Wiley Blackwell Publishing, Inc, 2016-08)
Sperm reserves are costly to produce and so the development of different sperm allocation strategies may be advantageous. Knowledge of sperm allocation strategies is important from an evolutionary perspective because they ...
The influence of alcohol consumption in conjunction with sex hormone deficiency on ca/p ratio in rats
(Hindawi publishing corp, 2016)
Deficiency of sex hormones and excessive alcohol consumption are factors that have been related to alterations in the pattern of bone mineralization and osteoporosis. The aim of this study was to evaluate possible alterations ...
Revealing the consequences of male-biased trophy hunting on the maintenance of genetic variation
(Springer, 2015-06)
Demographic models accounting for operational sex ratio (OSR) show that male numbers can have a substantial influence on the dynamics of wild populations. We used the Cantabrian capercaillie, a forest bird, as a model to ...
Estrutura populacional de Callinectes ornatus Ordway (Crustacea, Portunidae) no Balneário Shangri-Lá, Pontal do Paraná, Paraná, Brasil
(Sociedade Brasileira de Zoologia, 2003-12-01)
Swimming crabs are commonly found in the otter-trawl shrimp fishery by-catch, which operate intensively in the Coastal Plain of Leste Beach, where is located Shangri-lá Beach (25°37'30S and 48°25'08W), Paraná State. This ...