Document Detail

Insects from the grazing food web favoured the evolutionary habitat shift to bright environments in araneoid spiders.
MedLine Citation:
PMID:  17148289     Owner:  NLM     Status:  MEDLINE    
The Araneoidea comprises a diverse group of web-building spiders, and part of this diversity is believed attributable to habitat expansion to bright environments. We clarified the fitness-related advantages of living in such environments by examining prey availability and the growth rates of 10 species in three families inhabiting grassland (bright) and forest understory (dim) habitats. Spiders in the grassland habitat captured more prey, derived mainly from the grazing food web, than those in the forest-floor environment, and this difference was manifested in their growth rate. Independent contrasts indicated that increased utilization of insects from the grazing food web led to an evolutionary increase in adult body size. These results suggest that the shift to bright environments enabled araneoid spiders to evolve diverse life-history traits, including rapid growth and large size, which were not possible in dim environments.
Tadashi Miyashita; Aya Shimazaki
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Biology letters     Volume:  2     ISSN:  1744-9561     ISO Abbreviation:  Biol. Lett.     Publication Date:  2006 Dec 
Date Detail:
Created Date:  2006-12-06     Completed Date:  2008-08-14     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  101247722     Medline TA:  Biol Lett     Country:  England    
Other Details:
Languages:  eng     Pagination:  565-8     Citation Subset:  IM    
School of Agriculture & Life Sciences, University of Tokyo, Tokyo 113-8656, Japan.
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MeSH Terms
Analysis of Variance
Body Size / physiology
Food Chain
Insects / physiology*
Predatory Behavior / physiology
Spiders / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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