Should I stay or should I go? Optimal parental care decisions of a nest-guarding fish
Should I stay or should I go? Optimal parental care decisions of a nest-guarding fish
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我应该走还是留？
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
E. Marschall
中科院分区：
文献类型：
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作者：
G. Steinhart;E. Dunlop;M. Ridgway;E. Marschall
背景：父母的照顾通常会增加后代的存活率，但对父母来说，提供照顾会降低成年人的生长和存活率。因此，在当前或未来的生殖投资之间存在一种权衡，不同人口结构和选择压力的人口可能对何时提供护理和提供多少护理有不同的阈值。问：不同种群的小口鲈鱼Micropterus bassieu在为小窝提供照顾的意愿上有多大的差异？什么因素是最重要的，在确定最佳育雏遗弃阈值？研究方法：我们用动态规划，探讨成年和少年的生存，育雏捕食，成功的巢的概率，钓鱼压力，和父母的照顾成本影响育雏遗弃阈值。结果：成人年生存率是决定最佳父母照顾决定的最重要因素。当成年人的年存活率和后代的日存活率较低时，遗弃的可能性较小。高昂的父母照顾成本导致雄性放弃较大的育雏。与父母的年龄不同的因素（如成年人的生存或提供护理的成本）更重要的是在确定遗弃行为比年龄独立变量（如后代的生存或巢成功的概率），部分原因是较大的育雏大小为老年人，较大的男性。增加钓鱼压力，风暴或巢捕食者增加放弃阈值，但不同程度。
Background: Parental care generally increases offspring survival but, for the parent, providing care can reduce adult growth and survival. Therefore, a trade-off exists between investments in current or future reproduction, and populations with different demographics and selective pressures may have different thresholds for when and how much care they provide. Question: How variable are different populations of smallmouth bass Micropterus dolomieu in their willingness to provide care for small broods? What factors are most important in determining optimal brood abandonment thresholds? Methods: We used dynamic programming to explore how adult and juvenile survival, brood predation, probability of nest success, angling pressure, and parental care costs affected brood abandonment thresholds. Results: Adult annual survival was the most significant factor in determining optimal parental care decisions. Abandonment was less likely when adult annual survival and offspring daily survival were low than when survival was high. High parental care costs led males to abandon larger broods. Factors varying with parental age (e.g. adult survival or cost of providing care) were more important in determining abandonment behaviour than ageindependent variables (e.g. offspring survival or probability of nest success) in part because of the larger brood sizes for older, larger males. Increasing angling pressure, storms or nest predators increased abandonment thresholds, but to differing degrees.