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BIBTEX RIS

Deriva nictemeral de macroinvertebrados en el rio Llobregat (Barcelona)

1986; Volume: 2; Issue: 1 Linguagem: Inglês

10.23818/limn.02.17

ISSN

2660-8537

Autores

María Rieradevall,

Tópico(s)

Aquatic Invertebrate Ecology and Behavior

Resumo

A study on the qualitative and quantitative coniposition of niacroiri~ertebrate drift in the Llobregat river (NE 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 m.' /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\.ln~.~ .8 I0/o of the organismes collected were exuviae, mainly pupal chironomid skins (54%) and nimphal ephemeroptera moults (27(Ynj.* * iiORA ',il AK Figura 2.-Variación del número de individuos en la deriva por hora (Tasa de Deriva Total).(-) Horas de oscuridad.(?) Hora de da y puesta del sol.Daily fluctuations of the drifi rate.(-) Darkncss.(1) Sunset aiid wiirisc.

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