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SCI论文目录 |
Long-term changes of planktonic rotifers in a subtropical Chinese
lake dominated by filter-feeding fishes.
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| 出 版 社：Freshwater Biology [Freshwat. Biol.]. |
| 发表时间：2001 |
| 台 站：
东湖湖泊生态系统试验站
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| 作 者：Shao, Z; Xie, P*; Zhuge, Y |
| 点 击 率：2862 |
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| 关 键 字：null |
| 摘 要：null |
| 关 键 字(英文)：null |
摘 要(英文)：The long-term changes (1956-1998) in density and species
composition of planktonic rotifers were studied at two sampling
stations (I, II) of Lake Donghu, a shallow eutrophic Chinese lake
densely stocked with filter-feeding fishes. Annual average
densities of rotifers increased with an increase in fish yield and
eutrophication, whilst species number decreased from 82 in
1962-1963 to 62 in 1994-1998. During 1962-98, some species such as
Anuraeopsis fissa, Polyarthra spp. (including P. dolichoptera & P.
vulgaris), Trichocerca pusilla and Synchaeta oblonga increased
their percentage in abundance remarkably, whilst the proportion of
Keratella cochlearis decreased at two relatively eutrophic
stations from 19 to 4.2% at Station I and from 30 to 3.2% at
Station II. The high r sub(max) of A. fissa probably made it more
successful than other rotifers under high predation pressure by
planktivorous fish. The decrease in the K. cochlearis population
might be attributed partly to predation by Cyclops vicinus. Small
rotifers were less vulnerable to fish predation than large-sized
cladocerans. Decreases in cladocerans coincided with increases in
rotifers, suggesting that the indirect effect of fish predation on
cladocerans might have partly contributed to the population
development of rotifers in Lake Donghu during recent decades. The
authors also conducted surveys (1994-1998) of seasonal dynamics of
rotifers at four sampling stations (I-IV) which have varied in
trophic status after fragmentation of the lake in the 1960s. A
total of 75 species were identified at the four stations. Both
densities and biomass of rotifers were considerably higher in the
two more eutrophic stations than in the two less eutrophic
stations. This indicates that the population increase of rotifers
at Stations I and II during recent decades might be partly
attributed to eutrophication of the lake water.
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