Reference : Progenesis as an intrinsic factor of ecological opportunity in a polyphenic amphibian
Scientific journals : Article
Life sciences : Aquatic sciences & oceanology
Life sciences : Zoology
Life sciences : Environmental sciences & ecology
http://hdl.handle.net/2268/251605
Progenesis as an intrinsic factor of ecological opportunity in a polyphenic amphibian
English
Lejeune, Benjamin mailto [Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Laboratoire d'Écologie et de Conservation des Amphibiens >]
Bissey, Lucie [Université de Liège - ULiège > > Laboratoire d'Ecologie et de Conservation des Amphibiens > >]
Didaskalou, Emilie [Université de Liège - ULiège > > Laboratoire d'Ecologie et de Conservation des Amphibiens > >]
Sturaro, Nicolas mailto [Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanographie biologique >]
Lepoint, Gilles mailto [Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanographie biologique >]
Denoël, Mathieu mailto [Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Laboratoire d'Écologie et de Conservation des Amphibiens >]
In press
Functional Ecology
Wiley
Yes (verified by ORBi)
International
0269-8463
1365-2435
Oxford
United Kingdom
[en] Developmental plasticity ; diet ; facultative paedomorphosis ; heterochrony ; key innovation ; polymorphism ; niche differentiation ; stable isotope analysis ; trophic polyphenism ; size evolution ; progenesis ; trophic niche ; Amphibian ; palmate newt ; Lissotriton helveticus
[en] 1. Paedomorphosis, a developmental heterochrony involving the retention of larval traits at the adult stage, is considered a major evolutionary process because it can generate phenotypic variation without requiring genetic modifications. Two main processes underlie paedomorphosis: neoteny, a slowdown of somatic development, and progenesis, a precocious maturation associated to body size reduction. Being essentially a truncation of ontogeny, progenesis has often been deemed an evolutionary dead-end with advantages attributed to precocious reproduction or small body size required in specific environmental contexts (e.g. parasitism, interstitial life), but there is a lack of studies on the immediate ecological consequences of progenesis.
2. Because body size is a key factor determining trophic ecology in animals, we hypothesized that progenesis might intrinsically promote ecological opportunity via body size reduction (i.e. ‘the trophic advantage of progenesis’ hypothesis). We tested this hypothesis in facultatively progenetic palmate newts (Lissotriton helveticus) using stable isotope niche modelling and diet reconstruction in conjunction with traditional stomach content analyses and body condition assessment.
3. We show that not only did progenetic individuals occupy a different trophic niche than metamorphic individuals in all populations, but the smaller they were compared to metamorphs due to progenesis, the more different they were in terms of trophic ecology, with no negative effect on their body condition.
4. Altogether, the results suggest that via body size reduction, progenesis may generally act as an intrinsic factor of ecological opportunity, allowing the use of existing but previously unavailable resources, even in habitats where seemingly little opportunity exists. We argue that beyond the classically recognized fitness advantages of progenetic development, this process may also generally bring an immediate trophic advantage via body size reduction, which would have important implications to understand the evolution and adaptiveness of this process in many different taxa, from marine meiofauna to primates.
Freshwater and OCeanic science Unit of reSearch - FOCUS
Fonds de la Recherche Scientifique - F.R.S.-FNRS ; Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA ; Fonds Spéciaux pour la Recherche
http://hdl.handle.net/2268/251605
10.1111/1365-2435.13708
This paper is published by Wiley and is available on their website (see doi link once available). Raw data are deposited on this page. The final paginated version will soon be available.

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