NDLI: Plankton dynamics in a high-mountain lake (las-yeguas, sierra-nevada, spain)—indirect evidence of ciliates as food source of zooplankton. Hydrobiologia 274: 29–35 (1994).

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Plankton dynamics in a high-mountain lake (las-yeguas, sierra-nevada, spain)—indirect evidence of ciliates as food source of zooplankton. Hydrobiologia 274: 29–35 (1994).

Content Provider	CiteSeerX
Author	Cruz-Pizarro, L. Reche, I. Carrillo, P.
Abstract	A detailed sampling programme during the ice-free season (July-September) in the oligotrophic lake Las Yeguas (Southern Spain) has shown a well-defined time lag between phytoplankton and zooplankton maximum standing stocks, the former displaying a peak (23 plgC- ') just after the ice-melting, and the latter by the end of September (80 pgC 1-). A ratio of autotrophs to heterotrophs lower than 1 which lasted more than two thirds of the study period may suggest a high algal productivity per unit of biomass. The estimated strong top-down regulation of phytoplankton by zooplankton indicates an efficient utilization of resources. A comparative analysis between the available food supply and the critical food concentration that is necessary to maintain the population of Daphnia pulicaria (which constitutes up to 98 % of the hetero-trophic biomass) proves this species to be food-limited in the lake under study. To explain the dominance (and development) of such large-bodied cladoceran population, we discuss the possibility of the utilization of naked protozoan ciliates (Oligotrichidae) as a complementary high quality food source, and the exploitation of benthic resources through a coupled daily migration behav-iour.
File Format	PDF
Publisher Date	1994-01-01
Access Restriction	Open
Subject Keyword	Food Source Plankton Dynamic High-mountain Lake Coupled Daily Migration Behav-iour Well-defined Time Lag Oligotrophic Lake La Yeguas Benthic Resource Naked Protozoan Ciliate Complementary High Quality Food Source Hetero-trophic Biomass High Algal Productivity Critical Food Concentration Available Food Supply Southern Spain Daphnia Pulicaria Comparative Analysis Strong Top-down Regulation Efficient Utilization Detailed Sampling Programme Large-bodied Cladoceran Population Study Period Ice-free Season
Content Type	Text

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