Predator-induced diapause in Daphnia magna may require two chemical cues
Predator-induced diapause in Daphnia magna may require two chemical cues
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DOI：
10.1007/s004420050772
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发表时间：
1999-05
期刊：
影响因子：
2.7
通讯作者：
M. Ślusarczyk
中科院分区：
文献类型：
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作者：
M. Ślusarczyk
鱼类分泌物刺激大型蚤产生滞育卵可以解释为一种抗捕食者防御，确保在鱼类捕食的高风险时期保护基因组。联合作用对D.测试了源自受伤的同种猎物和鱼类利它素的“报警”化学品的大滞育。实验结果表明，当这些线索同时存在时，它们同时促进了上卵的产生和雄性的形成，表明它们在整个Daphniasexploration模式的同步化中起作用。Ephippial鸡蛋只产生在鱼利它素和同种报警化学物质的存在下，而男性后代发生在治疗中，其中两个，一个或没有的线索存在。然而，当两种线索都提供时，雄性的产量最高。无论假设的报警物质与捕食者的气味来自Daphniaspecimens实际上吃的鱼或从粉碎的同种个体测试线索相似。然而，化学品从粉碎摇蚊幼虫结合鱼类利它素没有引起类似的反应在大型蚤。利用报警线索或捕食者利它素在诱导防御反应的猎物生物的相对优势进行了讨论。
The production of diapausing eggs byDaphnia magnastimulated by fish exudates can be explained as an anti-predator defence ensuring genome protection in periods of high risk from fish predation. The combined effects on the induction ofD. magnadiapause of an “alarm” chemical originating from injured conspecific prey and fish kairomones were tested. The results of the experiment showed that the cues when present together promote both the production of ephippial eggs and male formation, indicating their role in the synchronization of the entire mode ofDaphniasexual reproduction. Ephippial eggs were only produced in the presence of both fish kairomone and conspecific alarm chemicals, while male offspring occurred in the treatments where both, one or none of the cues were present. However, production of males was the highest when both cues were provided.D. magnaresponded similarly to the tested cues whether or not the hypothetical alarm substance associated with predator odour came fromDaphniaspecimens actually eaten by fish or from crushed conspecific individuals. However, chemicals from crushed chironomid larvae combined with fish kairomones did not induce a similar response inD. magna. The relative advantage of utilization of alarm cues or predator kairomones in the induction of defence responses in prey organisms is discussed.