Geographic variation in allometry in the guppy (Poecilia reticulata)

Egset, C. K., Bolstad, G. H., Rosenqvist, G., Endler, J. A. and Pélabon, C. 2011, Geographic variation in allometry in the guppy (Poecilia reticulata), Journal of evolutionary biology, vol. 24, no. 12, pp. 2631-2638.

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Title Geographic variation in allometry in the guppy (Poecilia reticulata)
Author(s) Egset, C. K.
Bolstad, G. H.
Rosenqvist, G.
Endler, J. A.ORCID iD for Endler, J. A.
Pélabon, C.
Journal name Journal of evolutionary biology
Volume number 24
Issue number 12
Start page 2631
End page 2638
Total pages 8
Publisher Wiley-Blackwell Publishing Ltd
Place of publication Oxford, U. K.
Publication date 2011-12
ISSN 1010-061X
Keyword(s) predation
sexual selection
swimming performance
Summary 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.
Language eng
Field of Research 060399 Evolutionary Biology not elsewhere classified
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2011, The Authors
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