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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. 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, more
Peer reviewed article  

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Keywords
    Adults; Intertidal environment; Juveniles; Mud flats; Population dynamics; Population structure; Spatial variations; Hydrobia ulvae (Pennant, 1777) [WoRMS]; ANE, France, Poitou-Charentes, Marennes-Oleron Bay [Marine Regions]; Marine

Authors  Top 
  • Haubois, A.-G.
  • Guarini, J.-M.
  • Richard, P.
  • Hemon, A.
  • Arotcharen, E.
  • Blanchard, G.F., more

Abstract
    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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