Coexistence with similar life cycles in two species of freshwater copepods (Crustacea) |
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Authors: | K. Elgmork G. Halvorsen J. A. Eie A. Langeland |
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Affiliation: | (1) Department of Biology, Division of Zoology, University of Oslo, Blindern, N-0316, P.O. Box 1050, 3 Oslo, Norway;(2) Borgarheimvn. 7, N-1435 Kråkstad;(3) Norwegian Institute for Nature Research, Tungasletta 2, N-7004 Trondheim |
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Abstract: | Two species of freshwater cyclopoid copepods, Cyclops scutifer Sars and Mesocyclops leuckarti (Claus), with different ecological requirements, coexist in three humic ponds near the timberline in boreal forests in south-central Norway. The life cycle in both species is basically regulated by complete depletion of oxygen during the long winter. There is a short period of reproduction in spring followed by a rapid development during summer and autumn to advanced instars, capable of diapause when oxygen depletion starts in early winter. Both species have an exclusive 1-yr cycle.The long winter under anoxic conditions is passed in diapause as large copepodids (late developmental instars) with usually no individuals left in the plankton.Even if co-occurring in the same habitats with similar life cycles, there is a temporal and spatial segregation. |
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Keywords: | life cycles coexistence competition diapause humic lakes hydrography |
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