Statistical analysis of polychaete population density: dynamics of dominant species and scaling properties in relative abundance fluctuations
- 1Univ. Lille Nord de France, 59000 Lille, France
- 2USTL, LOG, 62930 Wimereux, France
- 3CNRS, Laboratoire d'océanologie et de géosciences (LOG), UMR8187, 62930 Wimereux, France
- 4Université de Caen-Basse Normandie CNRS, UMR M2C 6143, 14000 Caen, France
Abstract. We consider here the dynamics of two polychaete populations based on a 20 yr temporal benthic survey of two muddy fine sand communities in the Bay of Morlaix, Western English Channel. These populations display high temporal variability, which is analyzed here using scaling approaches. We find that population densities have heavy tailed probability density functions. We analyze the dynamics of relative species abundance in two different communities of polychaetes by estimating in a novel way a "mean square drift" coefficient which characterizes their fluctuations in relative abundance over time. We show the usefulness of using new tools to approach and model such highly variable population dynamics in marine ecosystems.