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Titolo:
Adaptive diversity in heterogeneous environments for populations regulatedby a mixture of soft and hard selection
Autore:
de Meeus, T; Goudet, J;
Indirizzi:
Univ Montpellier 2, Lab Parasitol Comparee, CNRS, UMR 5555, F-34095 Montpellier 5, France Univ Montpellier 2 Montpellier France 5 5, F-34095 Montpellier 5, France Univ Lausanne, Inst Zool & Ecol Anim, CH-1015 Lausanne, Switzerland Univ Lausanne Lausanne Switzerland CH-1015 CH-1015 Lausanne, Switzerland
Titolo Testata:
EVOLUTIONARY ECOLOGY RESEARCH
fascicolo: 8, volume: 2, anno: 2000,
pagine: 981 - 995
SICI:
1522-0613(200012)2:8<981:ADIHEF>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
HABITAT SELECTION; SUFFICIENT CONDITIONS; POLYMORPHISM; MODEL; EVOLUTION; COPEPODA; FITNESS; LARVAE; NICHES;
Keywords:
adaptive polymorphism; co-existence; density dependence; hard selection; heterogeneous environments; invasive ESS; population regulation; soft selection;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: de Meeus, T Ctr Etud Polymorphisme Microorganismes, IRD, Ctr IRD, CNRS,UMR9926, 911 Ave Agropolis, F-34032 Montpellier 01, France Ctr Etud Polymorphisme Microorganismes 911 Ave Agropolis Montpellier France 01
Citazione:
T. de Meeus e J. Goudet, "Adaptive diversity in heterogeneous environments for populations regulatedby a mixture of soft and hard selection", EVOL EC RES, 2(8), 2000, pp. 981-995

Abstract

The stable co-existence of two haploid genotypes or two species is studiedin a spatially heterogeneous environment submitted to a mixture of soft selection (within-patch regulation) and hard selection (outside-patch regulation) and where two kinds of resource are available. This is analysed both at an ecological time-scale (short term) and at an evolutionary time-scale (long term). At an ecological scale, we show that co-existence is very unlikely if the two competitors are symmetrical specialists exploiting differentresources. In this case, the most favourable conditions are met when the two resources are equally available, a situation that should favour generalists at an evolutionary scale. Alternatively, low within-patch density dependence (soft selection) enhances the co-existence between two slightly different specialists of the most available resource. This results from the opposing forces that are acting in hard and soft regulation modes. In the case of unbalanced accessibility to the two resources, hard selection favours the most specialized genotype, whereas soft selection strongly favours the less specialized one. Our results suggest that competition for different resources may be difficult to demonstrate in the wild even when it is a key factor in the maintenance of adaptive diversity. At an evolutionary scale, a monomorphic invasive evolutionarily stable strategy (ESS) always exists. When a linear trade-off exists between survival in one habitat versus that in another, this ESS lies between an absolute adjustment of survival to niche size (for mainly soft-regulated populations) and absolute survival (specialization) in a single niche (for mainly hard-regulated populations). This suggests that environments in agreement with the assumptions of such models should lead to an absence of adaptive variation in the long term.

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Documento generato il 27/11/20 alle ore 07:31:45