Effects of interference and exploitative competition from large-bodied cladocerans on rotifer community structure |
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Authors: | Fradkin Steven C |
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Institution: | (1) Kellogg Biological Station and Department of Zoology, Michigan State University, 49060 Hickory Corners, MI, USA;(2) Present address: Department of Biological Sciences, Dartmouth College, 03755 Hanover, NH, USA |
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Abstract: | I examined the effects of a graded density of the large-bodied cladoceran Daphnia pulicaria upon a natural rotifer assemblage to assess the relative magnitudes of interference and exploitative competition. An in situ, 5-day, bag-enclosure experiment was conducted to test the hypothesis that populations of the rotifers Anuraeopsis spp., Keratella cochlearis typica and Polyarthra spp. are differentially suppressed by interference competition. Rotifer density decreases and observed vs. expected mortality rates for all three rotifer taxa were consistent with the hypothesis of suppression via interference competition. Evidence of exploitative effects were also apparent, though interference effects appeared more important at higher cladoceran densities. |
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Keywords: | exploitative competition field enclosures interference competition large-bodied cladocerans rotifers |
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