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The functional response of copepodid stages to adult of Parabroteas sarsi (copepoda, calanoida)
Author(s) -
Vega Marina Patricia A.
Publication year - 1997
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19970820112
Subject(s) - predation , biology , functional response , predator , calanoida , crustacean , juvenile , biomass (ecology) , zoology , ecology , copepod
P. sarsi is a carnivorous calanoid commonly found in South Andes lakes. Feeding experiments were carried out in order to analyze the functional response of P. sarsi (copepodid IV to adult) on different cladoceran prey. Predation rates increased with increasing prey density up to maximum (type II) in almost cases. The highest attack coefficients were obtained when P. sarsi adults were fed with the smaller prey ( C. dubia juvenile and B. longirostris ). The ingestion rates of copepodid IV and CV were smaller than for the adults. The ingested biomass as a proportion of predator biomass (B e /B p ) showed an inversal relationship with the predator length. The maximum B e /B p ratio, in both sex of P. sarsi , was achieved with C. dubia adult, the intermediate‐sized prey.