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1986

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/32783

Deriva nictemeral de macroinvertebrados en el rio Llobregat (Barcelona)

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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)

Subject

Invertebrats aquàtics, Cursos d'aigua, Dípters, Biologia d'aigua dolça, Llobregat (Catalunya : Curs d'aigua)

Subject (English)

Aquatic invertebrates, Rivers, Diptera, Freshwater biology, Llobregat River (Catalonia)

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Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

Citation

RIERADEVALL I SANT, Maria and PRAT I FORNELLS, Narcís. Deriva nictemeral de macroinvertebrados en el rio Llobregat (Barcelona). Limnetica. 1986. Vol. 2, num. 147-156. [consulted: 15 of August of 2026]. Available at: https://hdl.handle.net/2445/32783

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