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Title: Deriva nictemeral de macroinvertebrados en el rio Llobregat (Barcelona)
Author: Rieradevall i Sant, Maria
Prat i Fornells, Narcís
Keywords: Invertebrats aquàtics
Cursos d'aigua
Biologia d'aigua dolça
Llobregat (Catalunya : Curs d'aigua)
Aquatic invertebrates
Freshwater biology
Llobregat River (Catalonia)
Issue Date: 1986
Publisher: Asociación Ibérica de Limnología
Abstract: A study on the qualitative and quantitative coniposition of macroinvertebrate drift in the Llobregat river ( N E Spain) is put fonvard. Samples were taken hourly during a 24 hour period in august 1982. The samples were taken with a net of 625 cm. of filtering surface and an opening mesh size of 500 microns, which íiltered 72,1 m3 /h. and collected 75.719 individuals during the sampling period. That means a drift rate of 1.224 indiv./h. and a drift density of 17 indi/m3 . 8 I0/o of the organismes collected were exuviae, mainly pupal chironomid skins (54%) and nimphal ephemeroptera moults (27(Ynj. The remainder percentage of living organisms represents a drift rate of 227 indiv./h. and a drift density of 3.14 indiv./m3. These are intermediate values ifwe compare them with the data published. Sixty per cent of the living drift were chiroiiomids. 17.5 '1 ephemeroptera and 10 (%1 trichoptera; these being the niost iniportant groups. Ofthe 87 species identified in those groups 23 were common in al1 the (7 1 ) samples (Table 1)
Note: Reproducció del document publicat a:
It is part of: Limnetica, 1986, vol. 2, p. 147-156
Appears in Collections:Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

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