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Titolo: POLYMORPHISM IN BISEXUAL REPRODUCTIVE PATTERNS OF CYCLICAL PARTHENOGENS  A SIMULATION APPROACH USING A ROTIFER GROWTHMODEL
Autore: APARICI E; CARMONA MJ; SERRA M;
 Indirizzi:
 UNIV VALENCIA,DEPT MICROBIOL & ECOL E46100 BURJASSOT SPAIN
 Titolo Testata:
 Ecological modelling
fascicolo: 13,
volume: 88,
anno: 1996,
pagine: 133  142
 SICI:
 03043800(1996)88:13<133:PIBRPO>2.0.ZU;2S
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 DAPHNIAMAGNA;
 Keywords:
 PARTHENOGENESIS; POPULATION DYNAMICS; REPRODUCTION; ZOOPLANKTON;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Science Citation Index Expanded
 Citazioni:
 24
 Recensione:
 Indirizzi per estratti:



 Citazione:
 E. Aparici et al., "POLYMORPHISM IN BISEXUAL REPRODUCTIVE PATTERNS OF CYCLICAL PARTHENOGENS  A SIMULATION APPROACH USING A ROTIFER GROWTHMODEL", Ecological modelling, 88(13), 1996, pp. 133142
Abstract
A dynamic model based on six differential equations, developed in a previous paper by Serra and Carmona (1993) was modified and used to address the theoretical possibility of polymorphism for the strategies ofmixis  i.e., strategies for bisexual phase induction  in cyclical parthenogens. The model focuses on rotifers and describes the growth rates for amictic (asexual) females, fertilizable mictic (sexual) females, mictic females that produce males, mictic females that produce resting eggs (i.e., sexual eggs), males and resting eggs, and takes into account the main constraints on mixis. Moreover, birth rates were assumed as timedependent, which involved a limited period for population growth. By using computer simulation we explored the evolution of the genotypes determining mixis ratio  defined as the proportion of the eggs produced from amictic females that develop into mictic females  and the timing of mixis induction. The assumptions on the genetic systemdid not qualitatively affect simulation conclusions. Our main findings are: (1) When mixis is induced, mixis ratios equal to one were selected, regardless the phenotype for the timing of mixis induction. (2) Afairly high degree of polymorphism was maintained for the genes determining the timing of mixis induction. (3) As a result from (1) and (2), at the evolutionary equilibrium, the population as a whole showed a steep increase of mixis ratio, from 0 to 1, during the sexual phase ofthe growth cycle. (4) If the moment of mixis induction is assumed to be based on an onelocus, twoallele genetic system, results show thatgenes determining an early mixis were more frequent than expected from optimization criteria. Therefore, at equilibrium, the number of resting eggs produced by the population was not maximized. We suggest thatthis finding is a result of the selection involved in a mating race among the sexual individuals in the population.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 10:33:34