Diurnal residence of the larger stages of the calanoid copepod Acartia tonsa in the anoxic monimolimnion of a tropical meromictic lake in New Guinea
Diurnal residence of the larger stages of the calanoid copepod Acartia tonsa in the anoxic monimolimnion of a tropical meromictic lake in New Guinea
复制标题
新几内亚热带分生湖缺氧环境中桡足类 Acaria tonsa 较大阶段的昼夜栖息
DOI：
10.1093/plankt/19.4.425
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发表时间：
1997
影响因子：
2.1
通讯作者：
W. Vyverman
中科院分区：
文献类型：
--
作者：
L. Meester;W. Vyverman
本文研究了巴布亚新几内亚纳加达湖沿岸部分消亡湖泊中的水蚤类桡足类Acartia tonsa的昼夜垂直迁移。在白天，动物迁移到氧跃层以下几米的地方，刚好在沉积物上方或进入沉积物，并留在缺氧的水中。个体发育阶段之间的垂直迁移模式各不相同;白天，水样中的成年桡足类和较大的桡足类数量不多（最深处的样品取自沉积物上方约0.5 m处）。在日落前后，较大的桡足类逐渐出现在水柱中，直到日落后才到达近地表食物层（0-2米）。我们的研究结果表明，晚上上升的桡足类在这个热带湖泊的光强度的相对变化有关，并有年龄和性别相关的差异，这些刺激的反应。
We studied diel vertical migration of the calanoid copepod Acartia tonsa in a coastal meromictic lake (Lake Nagada, Papua New Guinea). During the day, the animals migrate several metres below the oxycline to just above or into the sediments, and remain in anoxic water. Vertical migration patterns differ between ontogenetic stages; adults and larger copepodites do not occur in appreciable numbers in the water samples during the day (deepest sample taken at ~0.5 m above the sediment). Around sunset, the larger copepodites gradually appear in the water column, reaching the near-surface food layer (0-2 m) only well after sunset. Our results suggest that the evening ascent of the copepods in this tropical lake is related to relative changes in light intensity, and that there are age- and sex-related differences in the responses to these stimuli.