Data/hora: 18/06/2024 07:37:34

Provedor de dados: | 5
País: | France
Título: | Comparaison démographique des populations de deux annélides polychètes seIon l'orientation des baies dans l'estuaire du Saint-Laurent
Autores: | Caron, A; Desrosiers, G; Retiere, C; Hudier, E.
Data: | 1993
Ano: | 1993
Palavras-chave: | Orientation; Intertidal; Nereis virens; Nephtys caeca; Interpopulation variability; ORIENTATION; INTERTIDAL; NEREIS-VIRENS; NEPHTYS-CECA; INTERPOPULATION VARIABILITY.
Resumo: | Variations in demographic parameters between intertidal populations of Nereis virens and Nephtys caeca were studied. These polychaetes are major component of the Macoma balthica community in the Lower St. Lawrence estuary (Quebec, Canada). We compared spatial distribution between differently oriented shores in a small geographic area. Our results revealed an interpopulation variability that appears to be dependent on hydrodynamical processes, edaphic parameters and biological interactions. In north and northeast oriented flats, the higher densities of young individuals of Nereis virens are found in the higher tidal levels where we observed larval recruitment and the highest organic matter contents. On the other hand, the lower densities of adult worms are found in the lowermost part of the intertidal zone, in which we observed the lowest organic matter contents and sandy sediment. As for the southwest facing tidal flats, the highest densities of immature individuals were observed in gravelly sediment of the lowermost tidal level. Also, mature individuals of Nereis are found on the uppermost part. Larval recruitment occurs in the central area of these bays. For the other species, Nephtys caeca, intertidal populations were dominated by juvenile individuals. Nevertheless, we remarked some bigger worms on the lower tidal level. The densities of Nephtys are higher in the sandy sediment and lower in the rich organic sediment. Interpopulation variability of Nereis appears to be dependent on many hydrodynamical effects (larval spatial patterns, hypsometric segregation of sediment organic matter, etc.) and the thickness of the colonizable sediment layer. Our results suggest that adult-juvenile interactions play an important role in population regulation of this polychaete. Interpopulation variability of Nephtys caeca seems to be mainly caused by the sediment texture, most probably dependent on hydrodynamical processes. We noted that larval settlement of Nephtys occurs in the most depth zones.
Tipo: | Text
Idioma: | Francês

Identificador:

http://archimer.ifremer.fr/doc/00323/43390/43114.pdf

http://archimer.ifremer.fr/doc/00323/43390/

Editor: | Gauthier-villars
Formato: | application/pdf
Fonte: | Oceanologica Acta (0399-1784) (Gauthier-villars), 1993 , Vol. 16 , N. 4 , P. 403-412

Fonte:

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