Sexual dimorphism is a phenotypic differentiation between males and females of the same species. Thrips display a wide variety of sexual dimorphism between taxa including size, ornamentation and coloration (Crespi 1986, Mound 2005, Tyagi et al. 2008). During recent surveys on the thrips fauna in subtropical China, Aroidothrips longistylus Ananthakrishnan, an interesting and little known sexuall...

The present review summarizes the up-to-date knowledge on the sexual dimorphism of the CNS with special regard to the sexual differentiation of the bed nucleus of the stria terminalis (BST) and the amygdala in rat. The authors provide new evidence for the sexual dimorphism and differentiation of GABAergic, leucine-enkephalin-containing and parvalbumin-immunoreactive neurons in the BST and the a...

Within a single animal species, different morphs can allow for differential exploitation of foraging niches between populations, while sexual size dimorphism can provide each sex with access to different resources. Despite being potentially important agents of evolution, resource polymorphisms, and the way they operate in wild populations, remain poorly understood. In this study, we examine how...

The isoenzymes carbonic anhydrase II (CAII) and III (CAIII) have been measured by radioimmunoassay in the livers of male and female rats aged from 21 to 800 days. No sexual dimorphism at 21 days was found, but from 50 to 400 days both isoenzymes show sexual differences. From 600 days onwards, these differences are less apparent. CAIII concentrations in two 'fast' fibre muscles and one 'slow' fi...

The study was conducted in the area of the Sarnena Sredna Gora Mountain and the Thracian Plain in period 1996-2014. On a total of 262 golden jackals (Canis aureus L., 1758) (119 males and 143 females) thirteen somatometric parameters were measured. The comparison of the linear body parameters and the weights between males and females showed apparent sexual dimorphism in the jackals with a high ...

The aim of this study was to evaluate the sexual dimorphism in permanent maxillary canines among Kosovo-Albanian population. The study was conducted on 204 dental students, selected from Dental School, Medical Faculty in Prishtina. The mesiodistal and buccolingual diameters of the permanent maxillary canines were measured in dental casts using electronic digital calliper Boss, Germany, which ha...

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 ...

Assessing the long-term macroevolutionary consequences of sexual selection has been hampered by the difficulty of studying this process in the fossil record. Cytheroid ostracodes offer an excellent system to explore sexual selection in the fossil record because their readily fossilized carapaces are sexually dimorphic. Specifically, males are relatively more elongate than females in this superf...

The niche expansion and niche variation hypotheses predict that release from interspecific competition will promote niche expansion in depauperate assemblages. Niche expansion can occur by different mechanisms, including an increase in within-individual, among-individual, or bimodal variation (sexual dimorphism). Here we explore whether populations with larger niche breadth have a higher degree...

Skeletal characteristics vary among populations; therefore each population should have specific standards to optimize the accuracy of identification. Although many bones of skeleton present size related sexual differences, those of the hip bone usually displayed marked differences in morphology independent of size due to different reproductive functions mainly influenced by sex hormones. The di...