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Titolo:
Local extinctions promote co-existence of semelparous and iteroparous lifehistories
Autore:
Ranta, E; Tesar, D; Kaitala, V;
Indirizzi:
Univ Helsinki, Dept Ecol & Systemat, Div Populat Biol, Integrat Ecol Unit,FIN-00014 Helsinki, Finland Univ Helsinki Helsinki Finland FIN-00014 nit,FIN-00014 Helsinki, Finland Univ Jyvaskyla, Dept Biol & Environm Sci, FIN-40351 Jyvaskyla, Finland Univ Jyvaskyla Jyvaskyla Finland FIN-40351 FIN-40351 Jyvaskyla, Finland
Titolo Testata:
EVOLUTIONARY ECOLOGY RESEARCH
fascicolo: 7, volume: 3, anno: 2001,
pagine: 759 - 766
SICI:
1522-0613(200111)3:7<759:LEPCOS>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
DEMOGRAPHIC STOCHASTICITY; BIOLOGICAL POPULATIONS; STABLE POINTS; EVOLUTION; DYNAMICS; CHAOS; SELECTION; CYCLES;
Keywords:
co-existence; Cole's paradox; iteroparity; life history; semelparity; stochasticity;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Ranta, E Univ Helsinki, Dept Ecol & Systemat, Div Populat Biol, Integrat Ecol Unit,POB 17, FIN-00014 Helsinki, Finland Univ Helsinki POB 17 HelsinkiFinland FIN-00014 elsinki, Finland
Citazione:
E. Ranta et al., "Local extinctions promote co-existence of semelparous and iteroparous lifehistories", EVOL EC RES, 3(7), 2001, pp. 759-766

Abstract

We studied the evolution of semelparity (reproducing once per lifetime) and iteroparity (reproducing repeated times in subsequent breeding seasons) using numerical simulations. In particular, we were interested in the conditions enabling long-term persistence of the two strategies in a given population system. Our general approach was to simulate a semelparous and an iteroparous population in a spatially structured system where dispersing individuals link habitable sub-units together. The local dynamics of each sub-unit was subjected to demographic stochasticity. It appears that demographic stochasticity and local extinction processes may enhance the long-term co-existence of semelparity and iteroparity. The key for co-existence of the twolife histories is as follows. First, the population is set into a spatially structured context. Second, demographic stochasticity prevents local population dynamics reaching steady-state equilibria and creates strategy-specific local extinctions. These vacancies will be occupied by dispersing individuals of semelparous and iteroparous life histories. Without the joint action of these elements, the co-existence of the two life histories would become impossible.

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Documento generato il 28/11/20 alle ore 08:50:04