Structure des peuplements de macroinvertébrés benthiques en place et en dérive

Auteurs :
BOURNAUD, M.
MAUCET, D.
CHAVANON, G.

Description :
The species-abundance curves are used to study the structure of drifting macroinvertebrate communities in small streams (discharge about 0.1 m/s) in comparison with the standing crop of the benthos. Both the benthic communities during periods of stability and the diurnal drift ressemble the broken stick model of McArthur. Several kinds of perturbation, such as spates or organic pollution, or the nocturnal activity of drifting organisms induce deviations from the present model. These deviations spread further downstream for the drifting communities than for the standing ones. So the structure of drifting communities, although very sensitive to variations in the environment, is well defined, in spite of the temporary instability of drifting organisms. Moreover, the main features of the community are well summarized by the present representation (the species-abundance curves), which does not depend of faunistics and integrates the changes in the environment.


Type de document :
Article de périodique

Source :
Acta oecologica. Série Oecologia generalis Montreuil, 1983, vol. 4, n°. 1, p. 27-42, Références bibliographiques : 39 réf.

Date :
1983