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SCI论文目录 |
Changes of Leptodora kindti abundance (1957-1996) in a
planktivorous fishes-dominated subtropical Chinese lake (Lake
Donghu)
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| 出 版 社：Archiv fuer Hydrobiologie [Arch. Hydrobiol.]. |
| 发表时间：2000 |
| 台 站：
东湖湖泊生态系统试验站
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| 作 者：Xie, Ping; Huang, Xiangfei; Takamura, Noriko |
| 点 击 率：2343 |
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| 关 键 字：null |
| 摘 要：null |
| 关 键 字(英文)：null |
摘 要(英文)：The changes of L. kindti density from 1957 to 1996 were studied in
a shallow, eutrophic Chinese lake, Lake Donghu. Despite the fact
that the fish yield of planktivorous fish (silver carp and bighead
carp) has increased steadily, the population density of L. kindti
has also increased since 1957 and peaked in 1982/1983. The
increase of both fish and L. kindti densities during this period
may have benefitted from a considerable increase in the densities
of their zooplankton prey, and fish predation on L. kindti might
have been minor. As the fish yield increased further, their
predation began to suppress most zooplankton prey including L.
kindti. The largely increased fish predation on L. kindti is also
evidenced by the remarkable decline of their body length after
1984. The density of L. kindti was significantly higher at the
pelagic station (II) than at the littoral station (I), although
for L. kindti, the littoral zone was significantly more resource
profitable than the pelagic zone. The gradient of fish predation
(more fish in the littoral zone) is the most likely explanation,
since L. kindti is reported to be a preferred prey for many
planktivorous fishes. The maximum density of L. kindti was 1.78
ind./l (on Aug. 17, 1984) at Station I and 1.55 ind./l (on Sep.
13, 1985) at Station II, respectively, which are close to those in
several other eutrophic lakes.
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