ISSN:
1573-5117
Keywords:
Abra community
;
annual and pluriannual cycles
;
hydrologicals parameters
;
silting up
;
competitions
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The Abra alba community is considered as a faunistical unity well established on coastal areas of North Sea. This community shows, since several years, very important recruitments of certain species. Since 1978, recruitments of Abra alba, Tellina fabula, Phyllodoce (Anaïtides) mucosa, Lagis koreni or Lanice conchilega have been observed. However these demographic phenomena does not affect the structure of the community, which shows, through rank-frequency diagrams, the characteristic of a mature population, principally constituted of 7 species. An annual cycle study shows a succession of recruitments of several species. A correspondance factorial analysis was realised from grain size datas as well as abundances of 18 main species. This analysis shows an annual cycle which seems to be linked to the clay part. Maximal values of clay part appears in summer and minimal values at the end of winter or early springtime. The hydrological parameters studied, allowed to make the difference between external factors (continental contributions, phytoplanctonic activity etc...) and benthic activity.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00026758
Permalink