Abstract
Spatial overlap between Acanthocyclops robustus, with special emphasis on the adult females, and other zooplankton in one basin of a shallow (approximate depth of 2 m) eutrophic lake was studied.
Horizontal distribution patterns were analysed on two dates. On both dates, most taxa examined showed large-scale patchiness between the three sections of the lake basin (approximate length of 1.2 km). Similarly, most taxa, with the important exception of the adult female Acanthocyclops robustus, were significantly patchily distributed on the small-scale (i.e. within sections). However, the intensity of such patchiness was, in general, relatively low. There was no consistent evidence of aggregation by the adult females or copepodites and adult males (the latter two were considered together) of the predator in such small-scale prey patches.
Diurnal vertical distribution patterns were studied on two 24–25 hour periods. The first period was characterized by calm weather. Adult female, and perhaps male, Acanthocyclops robustus, Chydorus sphaericus, Bosmina Coregoni, Keratella cochlearis, Asplanchna species, Polyarthra vulgaris and Pompholyx sulcata seemed to show diurnal migration patterns, while seven other taxa showed consistent preferences for particular depths. Only copepod nauplii and Daphnia species were approximately evenly distributed. Negative correlations were found between the vertical distributions of the adult female predator and seven of the seventeen potential prey recognized.
The first half of the second period was characterised by strong winds which abated during the second half. Most zooplankton taxa showed inconsistent heterogeneous vertical distributions or were homogeneously distributed with vertical heterogeneity developing towards the end of the period. Only Bosmina longirostris and Daphnia species seemed to show vertical migration patterns. Thus, no consistent vertical segregation between predator and prey was detected.
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Roche, K. (1990). Spatial overlap of a predatory copepod, Acanthocyclops robustus, and its prey in a shallow eutrophic lake. In: Dumont, H.J., Tundisi, J.G., Roche, K. (eds) Intrazooplankton Predation. Developments in Hydrobiology, vol 60. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2067-5_16
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DOI: https://doi.org/10.1007/978-94-009-2067-5_16
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