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SCI论文目录 |
Experimental and Field Studies of Mesocyclops notius (Copepoda:
Cyclopoida) from a Subtropical Chinese Lake, Lake Donghu
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| 出 版 社： Journal of Plankton Research11 |
| 发表时间：2001 |
| 台 站：
东湖湖泊生态系统试验站
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| 作 者： Xie, P; Chen, X |
| 点 击 率：2394 |
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| 关 键 字：null |
| 摘 要：null |
| 关 键 字(英文)：null |
| 摘 要(英文)：null |
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This paper reports experimental and field studies on the cyclopoid
Mesocyclops notius from subtropical Lake Donghu close to the
Yangtze river. Mesocyclops notius, a dominant crustacean
zooplankter throughout tropical Australia, was previously
considered to be endemic to Australia, but recently, Mesocyclops
leuckarti in Lake Donghu was re-identified as M. notius.
Laboratory experiments were conducted to reveal the effect of
temperature (15, 20, 25 and 30 degree C) on the development,
growth and reproduction of M. notius. Temperature was inversely
related to development times of eggs, nauplii and copepodites,
body length and physiological longevity of adults, and brood size.
Body length and physiological longevity of females were greater
than those of males at the same temperature. No reproduction took
place at 15 degree C. Production and seasonal cycles of M. notius
during 1980 1982 were studied at two sampling stations of Lake
Donghu. At the mid-lake station, the annual production and
production/biomass (P/B) ratio of M. notius varied between 6.0
and18.0 g dry wt m super( 2) year super(1) and 74.6 and 95.5,
respectively. Mesocyclops notius reached their highest density
peaks in the warm months (July October), with a maximum density of
1256 individuals l super(1) at a littoral site. No reproduction
and recruitment by M. notius took place during the cold months
(December March) when the temperature of the lake water was <15
degree C. Mesocyclops notius were more abundant at a littoral
station than at a pelagic station, possibly due to different food
availability. The higher male:female sex ratio of M. notius at the
littoral station was most likely caused by size-selective fish
predation on larger females.
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