科研之友
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摘要
Coscinasterias acutispina is a multi-armed fissiparous sea star notorious for vigorous predation on the juveniles of abalone (e.g. Nardotis discus hannai) and the horned turban snail (e.g. Turbo cornutus). In the present study, the relationship between fission of the sea star and water temperature and nutritional condition was examined in three series of culture experiments. Twenty eight C. acutispina were kept individually in a concrete tank with running seawater (10-28 degrees C) and fed mussels for sixteen months. Twenty one of them divided once or more during the experiment. Forty three underwent fission. One occurred from August to December when the water temperature was relatively high (%26gt;18 degrees C). Under controlled water temperature conditions, 90% of C. acutispina divided at temperatures %26gt; 19 degrees C, whereas only 7 % of them divided at temperatures %26lt; 13 degrees C. Fourteen sister pairs of two small individuals derived from one sea star by fission were kept under different nutritional conditions of either starved or fed mussels (Mytilus galloprovincialis) ad libitum for more than a year. The starved individuals never divided, while almost all the fed sea stars divided at least once. These results suggest that both water temperature and nutritional conditions influence the frequency of fission in C. acutispina.
- 出版日期2013
