NDLI: Spatio^temporal di¡erentiation in the population structure of Hydrobia ulvae on an intertidal mud£at (Marennes-Ole¤ ron Bay, France)

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Spatio^temporal di¡erentiation in the population structure of Hydrobia ulvae on an intertidal mud£at (Marennes-Ole¤ ron Bay, France)

Content Provider	Semantic Scholar
Author	Haubois, A.-G. Guarini, J.-M. Richard, Pierre Blanchard, Gérard F. Sauriau, P.-G.
Copyright Year	2002
Abstract	Spatio^temporal changes in density, breeding cycle, growth and population structure of Hydrobia ulvae (Gastropoda: Prosobranchia) were studied by monthly sampling of a wide bare mud£at in MarennesOle¤ ron Bay. Four stations, located along a cross-shore transect and characterized by di¡erent geomorphological structures, were investigated from March 2000 to February 2001. Hydrobia ulvae was mainly distributed in the upper half part of the mud£at and no individuals were found in the lower part. The breeding cycle extended from March to December and showed two annual peaks, in spring and in autumn. Three cohorts were recruited during the year and showed high growth rates during summer; the parameters of the von Bertalan¡y model describing the growth curves were equal to kmax1⁄40.47 0.5 mm month71 and L11⁄45.4 0.2 mm. The snail population had similar size^ frequency structure along the transect at the beginning of the survey but summer recruitment initiated spatial di¡erentiation. Reproduction occurred in the middle part of the mud£at but recruits mainly settled down at the upper level of the mud£at; new cohorts appeared with increasing individual densities. The middle part of the mud£at was rather dominated by adult individuals which showed large density £uctuations.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://archimer.ifremer.fr/doc/2002/publication-598.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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