Resources allocated to reproduction decrease at the range edge of an expanding population of an invasive amphibian

Julien Courant; Jean Secondi; Viviane Bereiziat; Anthony Herrel

Resources allocated to reproduction decrease at the range edge of an expanding population of an invasive amphibian

Julien Courant ¹ Jean Secondi ^{2, 3} Viviane Bereiziat ¹ Anthony Herrel ⁴

1 MECADEV - Mécanismes adaptatifs : des organismes aux communautés

2 LEHNA - Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés

3 LETG-ANGERS - Littoral, Environnement, Télédétection, Géomatique - Laboratoire d’Etudes Environnementales des Systèmes Anthropisés

LETG - Littoral, Environnement, Télédétection, Géomatique UMR 6554

4 Evolutionary Morphology of Vertebrates

Abstract : Predicting the magnitude and nature of changes in a species’ range is becoming ever more important as an increas- ing number of species are faced with habitat changes or are introduced to areas outside of the species’ native range. An organism’s investment in life-history traits is expected to change during range shifts or range expansion because populations encounter new ecological conditions. While simulation studies predict that dispersal and reproductive allocation should increase at the range edge, we suggest that reproductive allocation might decrease at the range edge due to energy allocation trade-offs. We studied the reproductive investment of an invasive amphibian, Xenopus laevis, and measured reproductive allocation in three clusters of populations distributed from the centre to the edge of the colonized range of X. laevis in France. Resource allocation was estimated with the scaled mass index of gonads of both sexes during the local period of reproduction of the species. The level of resources allocated to reproduction was lower at the periphery of the colonized range compared to the centre and may be the result of changes in trade- offs between life-history traits. Such a pattern could be explained by interspecific competition or enhanced invest- ment in dispersal capacity.

Keywords : invasive species – range expansion – resource allocation – Xenopus laevis.

Document type :

Journal articles

Domain :

Environmental Sciences / Biodiversity and Ecology

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https://hal-sde.archives-ouvertes.fr/hal-01652713
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Submitted on : Thursday, November 30, 2017 - 3:33:59 PM
Last modification on : Thursday, May 9, 2019 - 6:10:02 PM

Resources allocated to reproduction decrease at the range edge of an expanding population of an invasive amphibian

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Resources allocated to reproduction decrease at the range edge of an expanding population of an invasive amphibian

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