Sexual size differences in the genus Sceloporus
نویسندگان
چکیده
منابع مشابه
The interplay between natural and sexual selection in the evolution of sexual size dimorphism in Sceloporus lizards (Squamata: Phrynosomatidae)
Sexual size dimorphism (SSD) evolves because body size is usually related to reproductive success through different pathways in females and males. Female body size is strongly correlated with fecundity, while in males, body size is correlated with mating success. In many lizard species, males are larger than females, whereas in others, females are the larger sex, suggesting that selection on fe...
متن کاملGrowing Apart Together: the Development of Contrasting Sexual Size Dimorphisms in Sympatric Sceloporus Lizards
Comparative biologists often conceptualize sexual size dimorphism (SSD) as a static characteristic of adult populations, but recent work has emphasized that SSD reflects a developmental process in which males and females ‘‘grow apart’’ in body size. This ontogenetic perspective requires knowledge of (1) the demographic factors that give rise to SSD (e.g., differential survival, migration, or gr...
متن کاملOntogenic differences in sexual size dimorphism across four plover populations
Sexual size dimorphism (SSD) among adults is commonly observed in animals and is considered to be adaptive. However, the ontogenic emergence of SSD, i.e. the timing of divergence in body size between males and females, has only recently received attention. It is widely acknowledged that the ontogeny of SSD may differ between species, but it remains unclear how variable the ontogeny of SSD is wi...
متن کاملProximate Determinants of Sexual Differences in Adult Body Size
In many animal species, males and females attain different adult body sizes. The processes underlying such sexual differences are undoubtedly complex and may involve an interplay between adaptive, exaptive, and nonadaptive genetic influences on the one hand and environmental variables on the other. For example, large body size may be shown by males because genes for that character confer a sele...
متن کاملA test of the reproductive cost hypothesis for sexual size dimorphism in Yarrow's spiny lizard Sceloporus jarrovii.
1. Trade-offs between reproduction and growth are central assumptions of life-history theory, but their implications for sexual size dimorphism (SSD) are poorly understood. 2. Adult male Yarrow's spiny lizards Sceloporus jarrovii average 10% larger than adult females. In a low-altitude (1700 m) population, this SSD develops because males grow more quickly than females during the first year of l...
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ژورنال
عنوان ژورنال: The University of Kansas science bulletin.
سال: 1978
ISSN: 0022-8850
DOI: 10.5962/bhl.part.17244