Long-term changes in muddy fine sand community of the Rance Basin: role of recruitment
Desroy, N.; Retière, C. (2001). Long-term changes in muddy fine sand community of the Rance Basin: role of recruitment. J. Mar. Biol. Ass. U.K. 81(4): 553-564
In: Journal of the Marine Biological Association of the United Kingdom. Cambridge University Press/Marine Biological Association of the United Kingdom: Cambridge. ISSN 0025-3154; e-ISSN 1469-7769, more
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| Keywords |
ANE, France, Basse-Normandie
Aquatic communities
Population functions > Recruitment
Temporal variations > Long-term changes
Abra alba (W. Wood, 1802) [WoRMS]
Basse-Normandie [Marine Regions]
Marine/Coastal |
| Abstract |
Dynamics of the Abra alba muddy fine sand community of the Rance Basin (western English Channel), initially sampled in one station by Retière at the beginning of the 1970s after the tidal power station built at the mouth of the estuary went into service, was reassessed from 1995 to 1997. Results showed a more 'mature' community in 1995-1997 with an increase in the number of species. After a short period, in spring 1995, during which the structure of the community was comparable to those described in 1972-1973, the assemblage was characterized by a great interannual structural stability. Densities of dominant species seem to fluctuate around a mean value comparable to the carrying capacity of the biota for these species. The recruitment of the dominant species with a long life span appears low compared to the densities of adults but seems sufficient to assure the replacement of individuals. Our results suggest that the pattern of massive recruitment followed by high mortality rates could not be the general rule and that a pattern of moderate recruitment followed by low post-settlement mortality of recruits should be more frequent. |
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