Abstract
We quantified the predation of Acanthocyclops americanus from the shallow Mediterranean lake Albufera, using gut contents from field collections and laboratory feeding tests. For functional response studies, we used Brachionus plicatilis (at 6 concentrations, 400–4000 ind. 40 ml−1) and Diaphanosoma mongolianum (at 2–20 ind. 40 ml−1). Copepod feeding rates were also estimated using different proportions of rotifer prey and lake seston (0–67.5% of seston + 40 individuals of B. plicatilis). Prey selection studies were conducted using five zooplankton species: Brachionus angularis, Brachionus plicatilis, Keratella tropica, Daphnia magna and Diaphanosoma mongolianum. Gut contents of field-collected adult Acanthocyclops contained filamentous algae and cyanobacteria and 16 zooplankton species (Keratella cochlearis, unspined and spined forms, K. tropica, Brachionus plicatilis, Brachionus calyciflorus, Brachionus angularis, Brachionus variabilis, Asplanchna girodi, Polyarthra vulgaris, Synchaeta pectinata, Lepadella rhomboides, unidentified bdelloids, Alona rectangula, Chydorus sphaericus, Bosmina longirostris, D. magna, Ceriodaphnia dubia and copepod nauplii). When fed B. plicatilis or D. mongolianum, female A. americanus had higher prey consumption rates than males. Increased proportion of lake seston caused reduced consumption of brachionid prey. Our data suggest that A. americanus is omnivorous in nature.
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SN and SSSS thank CONACyT (Mexico), the UNAM (DGAPA), and the University of Valencia for support during the stay.
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Maria Rosa Miracle—Deceased.
Guest editors: S. Nandini, S.S.S. Sarma, Erik Jeppesen & Linda May / Shallow Lakes Research: Advances and Perspectives
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Sarma, S.S.S., Miracle, M.R., Nandini, S. et al. Predation by Acanthocyclops americanus (Copepoda: Cyclopoida) in the hypertrophic shallow waterbody, Lake Albufera (Spain): field and laboratory observations. Hydrobiologia 829, 5–17 (2019). https://doi.org/10.1007/s10750-018-3546-7
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DOI: https://doi.org/10.1007/s10750-018-3546-7