Contribution
About the separation of benthos from stream samples
Rosillon, Dominique
Archiv für Hydrobiologie Volume 110 Number 3 (1987), p. 469 - 475
11 références bibliographiques
publié: Sep 30, 1987
DOI: 10.1127/archiv-hydrobiol/110/1987/469
ArtNo. ESP141011003011, Prix: 29.00 €
Abstract
A sorting procedure of the stream benthos samples is explained and tested. First, the samples are screened on three sieves (4, 1 and 0.4 mm mesh opening) in order to obtain 3 fractions. Three sorting methods are tested on the middle fraction (1 mm). The simple technique of “stirring” can largely reduce the sorting time. A sugar flotation applied on the 0.4 mm fraction is also very effective but the percentage of efficiency ranges from 100 to 22 according to the taxonomic groups. A subsampling method is also tested to estimate the number of individuals present in the flotation residue.
Mots-clefs
fauna • river • benthos • sugar