Differences in spatial structures between juveniles and adults of the gastropod Hydrobia ulvae on an intertidal mudflat (Marennes-Oléron Bay, France) potentially affect estimates of local demographic processes
Haubois, A.-G.; Guarini, J.-M.; Richard, P.; Hemon, A.; Arotcharen, E.; Blanchard, G.F. (2004). Differences in spatial structures between juveniles and adults of the gastropod Hydrobia ulvae on an intertidal mudflat (Marennes-Oléron Bay, France) potentially affect estimates of local demographic processes. J. Sea Res. 51(1): 63-68. http://dx.doi.org/10.1016/j.seares.2003.02.001
In: Journal of Sea Research. Elsevier/Netherlands Institute for Sea Research: Amsterdam; Den Burg. ISSN 1385-1101; e-ISSN 1873-1414, more
Spatial structures of juvenile and adult cohorts of the gastropod Hydrobia ulvae were investigated over a surface area of several km² in an intertidal mudflat at the end of the recruitment period. Three cohorts (average shell lengths of 3.9 ± 0.89 mm, 1.8 ± 0.43 mm and 1.1 ± 0.18 mm for cohorts I, II and III, respectively) were identified by a statistical analysis and their spatial distributions were characterised. Cohorts of juveniles (cohorts II and III) showed a patchy distribution pattern, whereas the cohort of adults (cohort I) was homogeneously distributed over the study area. These marked differences in spatial distribution of cohorts are likely to have a strong effect on estimates of local demographic processes, and hence of population dynamics.
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