✦ LIBER ✦

Spring-Summer Succession of Planktonic Rotifers in a South Andes Lake

✍ Scribed by Beatriz E. Modenutti

Publisher: John Wiley and Sons
Year: 1994
Tongue: English
Weight: 603 KB
Volume: 79
Category: Article
ISSN: 1434-2944
DOI: 10.1002/iroh.19940790306

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✦ Synopsis

Abstract

The dynamics of planktonic rotifer in Laguna Ezquerra (Rio Negro, Argentina) was studied from October 1988 to March 1989, in relation to food resources and cladoceran populations. During the spring and summer period, total rotifer density differed markedly. In spring rotifer populations remained at low density and an inverse relationship with cladoceran biomass was found. In contrast, in summer, the rotifer densities increased greatly and a positive relationship with cladoceran biomass was observed. Food resources decreased during mid January and this seemed to give rotifers a competitive advantage over cladocerans. Bosmina longirostris and Ceriodaphnia dubia were both present during the spring, but only Bosmina prevailed in summer. The composition of cladoceran assemblages together with food resources seem to be an important factor in rotifer dynamics.

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