Movement, sex ratio, and population density in a dwarf male spider species,Misumenoides formosipes(Araneae: Thomisidae)

Autor:	Gary N. Dodson, A. G. Anderson, L. M. Stellwag
Rok vydání:	2015
Předmět:	education.field_of_study Spider food.ingredient Ecology Population Zoology Biology biology.organism_classification Population density Sexual dimorphism Misumenoides formosipes food Insect Science Crab spiders Thomisidae education Sex ratio
Zdroj:	Journal of Arachnology. 43:388-393
ISSN:	1937-2396 0161-8202
DOI:	10.1636/arac-43-03-388-393
Popis:	Crab spiders in the subfamily Thomisinae rank among the most extreme animals in terms of sexual size dimorphism (SSD). Hypotheses regarding the apparent selection for dwarfing of males relative to females generally reference advantages of small male size for mobility. Specific proposals claim that selection should be strongest in species with limited male-male combat, which would otherwise favor larger males. We aimed to determine if the predicted traits of low densities, female biased sex ratios, more movement by males, and limited male-male conflict characterized a population of Misumenoides formosipes Walckenaer 1837. New and previous assessments of these characteristics in this extremely dimorphic spider revealed a mix of support and discordance with the predicted set of traits. Repeated plot censuses over 2 years, together with daily monitoring of females and collections of males, documented relatively low densities with males outnumbering females by as much as 2.37:1. The movements of marke...
Databáze:	OpenAIRE
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