Anti-Predator Defenses in Daphnia: Are Life-History Changes Always Linked to Induced Neck Spines?
Anti-Predator Defenses in Daphnia: Are Life-History Changes Always Linked to Induced Neck Spines?
复制标题
水蚤的反捕食者防御：生活史的变化是否总是与诱发颈刺有关？
作者：
J. Lüning
枝角类蚤状蚤对无脊椎动物捕食者黄巢藻释放的化学物质有表型反应。它们的颈刺上通常有几颗牙齿，这可能会增加它们在捕食者的攻击下幸存的机会。另一方面，这些有刺动物在延迟成熟和降低繁殖力方面遭受降低的适应性。一些研究将颈部牙齿和生活史反应描述为直接相关的权衡，尽管没有直接证据表明颈部牙齿本身承担了这些生活史成本。本研究描述了一种可能的方法来测试形态学和生活史变化之间的联系
The cladoceran Daphnia pulex responds phenotypically to chemicals released by one of its invertebrate predators Chaoborus flavicans. They produce neck spines with often several teeth which possibly increase the chance to survive the predator's attacks. On the other hand, these spined animals suffer a reduced fitness in terms of delayed maturity and reduced fecundity. Several studies describe both neck teeth and life-history responses as trade-offs which are directly linked although there is no direct evidence that neck teeth themselves bear those life-history costs. One possible way of testing the connection between morphology and life-history shifts is described in this study