Regulation of rotifer species by invertebrate predators in a hypertrophic lake: Selective predation on egg-bearing females and induction of morphological defences

J-M. Conde-Porcuna, S. Declerck

Onderzoeksoutput: Bijdrage aan wetenschappelijk tijdschrift/periodieke uitgaveArtikelWetenschappelijkpeer review

Samenvatting

Temporal changes in the biomass of rotifer plankton were examined in a shallow hypertrophic lake during 1 month (April/May), when the predatory rotifer Asplanchna brightwelli develops. The abundance of herbivorous rotifers was regulated by predation from A.brightwelli and from the copepod Acanthocyclops robustus. The densities and fecundity rates of Keratella cochlearis and Keratella quadrata were negatively related with the biomass of predators. Stomach analyses showed that Asplanchna fed selectively on reproductive females of K. cochlearis, reducing the fecundity of this species. Predators induced longer caudal spines in K. quadrata, which were negatively related to the fecundity of this rotifer, suggesting a reproductive cost associated with spine production. In contrast, spine length of K. cochlearis was not related to predators, but to temperature. These results showed that predators can reduce rotifer densities through increasing mortality and through decreasing rotifer fecundity rates regardless of phytoplankton biomass. We also show that morphological defences of K. cochlearis and K. quadrata are induced in different ways.
Originele taal-2Engels
Pagina's (van-tot)605-618
Aantal pagina's14
TijdschriftJournal of Plankton Research
Volume20
Nummer van het tijdschrift4
DOI's
StatusGepubliceerd - 1998
Extern gepubliceerdJa

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