Document Detail


Geographical variation in allometry in the guppy (Poecilia reticulata).
MedLine Citation:
PMID:  21955207     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Variation in static allometry, the power relationship between character size and body size among individuals at similar developmental stages, remains poorly understood. We tested whether predation or other ecological factors could affect static allometry by comparing the allometry between the caudal fin length and the body length in adult male guppies (Poecilia reticulata) among populations from different geographical areas, exposed to different predation pressures. Neither the allometric slopes nor the allometric elevations (intercept at constant slope) changed with predation pressure. However, populations from the Northern Range in Trinidad showed allometry with similar slopes but lower intercepts than populations from the Caroni and the Oropouche drainages. Because most of these populations are exposed to predation by the prawn Macrobrachium crenulatum, we speculated that the specific selection pressures exerted by this predator generated this change in relative caudal fin size, although effects of other environmental factors could not be ruled out. This study further suggests that the allometric elevation is more variable than the allometric slope.
Authors:
C K Egset; G H Bolstad; G Rosenqvist; J A Endler; C Pélabon
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-9-28
Journal Detail:
Title:  Journal of evolutionary biology     Volume:  -     ISSN:  1420-9101     ISO Abbreviation:  -     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-9-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8809954     Medline TA:  J Evol Biol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2011 The Authors. Journal of Evolutionary Biology © 2011 European Society For Evolutionary Biology.
Affiliation:
Centre for Conservation Biology, Department of Biology, University of Science and Technology (NTNU), Trondheim, Norway Centre for Integrative Ecology, School of Life & Environmental Sciences, Deakin University, Geelong, Vic., Australia.
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