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SCI论文目录 |
Long-term changes in crustacean zooplankton and water quality in a
shallow, eutrophic Chinese lake densely stocked with fish
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| 出 版 社：Hydrobiologia [Hydrobiologia]. |
| 发表时间：1999 |
| 台 站：
东湖湖泊生态系统试验站
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| 作 者：Yufeng, Y; Xiangfei, H; Jiankang, L |
| 点 击 率：2685 |
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| 关 键 字：null |
| 摘 要：null |
| 关 键 字(英文)：null |
摘 要(英文)：From surveys made in 1962-1963, 1973-1974, 1979-1996 at two
Stations in Lake Donghu, a shallow eutrophic water body near
Wuhan, P. R. China, the authors, derive long-term changes in
species composition, standing crop and body-size of planktonic
crustaceans. The species number decreased from the 1960s to the
1990s. The cladocerans dropped from 46 (1960s) to 26 (1980s) to 13
(1990s); the copepods decreased from 14 (1960s) to 10 (1980s) to 7
(1990s). From the mid-1980s on, the dominant crustaceans also
changed: Daphnia hyalina and D. carinata ssp. were replaced by
Moina micrura and Diaphanosoma brachyurum at Stations 1 and 2,
respectively; Cyclops vicinus replaced Mesocyclops leuckarti.
Densities and biomass of Cladocera decreased markedly after 1987.
Annual average densities and biomass of cladocerans were
statistically differences between 1962-1986 and 1987-1996 (P <
0.01). Annual average densities of Daphnia (Station 1 + Station 2)
were negatively correlated with fish yield. Since the 1980s,
annual average body length of Cladocera and Calanoida decreased,
while annual average body length of Cyclopoida increased. In the
same years, average body length of copepods was lower during
May-October than during January-April and November-December. A
12-yr data analysis showed annual average concentration of
chlorophyll-a (Chl-a) to be negatively correlated with annual
average density of Daphnia, whilst lake transparency was
positively correlated with annual average densities of Daphnia.
The results imply that, since Daphnia feeds efficiently on
phytoplankton, it could decrease concentration of Chl-a, and
enhance water transparency.
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