Abstract
Members of rotifer family Asplanchnidae are important invertebrate predators in freshwater communities. Although a considerable amount of information exists on species of Asplanchna, relatively less is known about Asplanchnopus. We isolated Asplanchnopus multiceps from the littoral of a small river in the State of Hidalgo in Central Mexico and separated a clone in our cultures. The gut content analysis of some animals collected from the field revealed the presence of cladocerans and rotifers, and therefore we cultured A. multiceps on a food mixture comprising littoral rotifers and cladocerans. We conducted population growth experiments of A. multiceps using six prey types (cladocerans: Macrothrix triserialis, Alona rectangula and Pleuroxus aduncus; rotifers, Brachionus patulus, B. macracanthus and B. urceolaris). The prey species (A. rectangula and B. patulus) on which the highest growth rates were observed were used to test the life-table demographic patterns in A. multiceps. All experiments were conducted in 50 ml containers with 25 ml of the medium and at three food levels (0.5, 1.0 and 2.0 ind. ml−1 for the cladocerans, and 2.0, 4.0 and 8.0 ind. ml−1 for the rotifers) with four replicates at each treatment. The spines of M. triserialis and B. macracanthus were apparently effective deterrents against Asplanchnopus predation since both these diets resulted in low, and sometimes negative, growth rates of the predator. The average lifespan and net reproductive rate of A. multiceps ranged from 3.8 to 8.4 days and 2.6 to 12.2 ind. female−1, respectively, on A. rectangula; and from 5.0 to 9.4 days and 1.6–18.4 ind. female−1, respectively, on B. patulus. The rate of population increase of A. multiceps ranged from 0.1 to 0.8 d−1, depending on the prey type and density. The role of A. multiceps in structuring littoral rotifer and cladoceran communities is discussed.
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Nandini, S., Sarma, S. Life History Characteristics of Asplanchnopus multiceps (Rotifera) Fed Rotifer and Cladoceran Prey. Hydrobiologia 546, 491–501 (2005). https://doi.org/10.1007/s10750-005-4291-2
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DOI: https://doi.org/10.1007/s10750-005-4291-2