Data/hora: 07/06/2024 09:16:41

Provedor de dados: | 5
País: | France
Título: | Recruitment and year-class segregation in response to abiotic and biotic factors
Autores: | Glemarec, M; Guillou, M.
Data: | 1996
Ano: | 1996
Resumo: | Do post-larval recruitment and year-class segregation constitute a response to abiotic and biotic factors? Avoiding the traditional controversy about conditions in rocky and soft bottom conditions, the authors describe several examples where year-class segregations are evident in soft bottoms, taken from different trophic guilds of echinoderm populations on the coast of Brittany: suspension feeders, herbivorous and carnivorous populations. Physical factors such as fronts or gyres can concentrate larvae and nutritive particles for suspension-feeder populations. These factors are, on the other hand, conducive to the establishment and persistence of stable populations in time. The cohorts being long-lived, the oldest classes are very abundant and, as a result, no place is available to recruits. Negative interactions can appear between adults and juveniles and populations can be considered as closed to recruitment. On the other hand, unstable physical conditions can promote high mortality in adult cohorts and the population can be considered as open to recruitment. In herbivorous and carnivorous guilds, recruitment occurs in places other than those occupied by the oldest year-classes. Ontogenic trophic migration explained by a change in diet from juvenile to adult is observed. In this case, no truly negative interaction between adults and juveniles appears to occur.
Tipo: | Text
Idioma: | Inglês
Identificador: | http://archimer.ifremer.fr/doc/00094/20496/18165.pdf
Editor: | Gauthier-Villars
Relação: | http://archimer.ifremer.fr/doc/00094/20496/
Formato: | application/pdf
Fonte: | Oceanologica Acta (0399-1784) (Gauthier-Villars), 1996 , Vol. 19 , N. 3-4 , P. 409-414