An Evolutionary Model of Parental Care in St . Peter ’ s Fish
An Evolutionary Model of Parental Care in St . Peter ’ s Fish
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圣彼得鱼亲代照顾的进化模型
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发表时间：
1997
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通讯作者：
S. B.E
中科院分区：
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作者：
S. B.E
加利利圣彼得鱼在照顾模式方面表现出异常的不稳定；仅男性、仅女性和双亲照顾都发生在同一人群中。我们提出了一个博弈论模型，并研究了观察到的护理频率的进化稳定性。使用每个模型参数的平均值（之前针对圣彼得鱼的基尼雷特湖种群进行估计），我们发现当前的护理频率不稳定，并且仅雄性护理是唯一进化上稳定的亲代护理策略。然而，两个关键模型参数具有显着的离散性：操作性别比（OSR）在时间和空间上都存在变化，双亲抚养相对于单亲抚养的优势主要取决于窝数，而窝数可能变化很大。在观察到的 OSR 和窝数的整个范围内，在某些区域中，纯雄性、纯雌性和双亲照顾都是一种进化稳定的策略；还有一个区域不存在进化稳定的策略。因此，OSR 和离合器尺寸的自然变化可能是观察到的护理频率的原因。 7 1997 学术出版社有限公司
Galilee St. Peter’s fish shows unusual lability in caring patterns; male-only, female-only and biparental care all occur in the same population. We present a game-theoretical model and investigate the evolutionary stability of the care frequencies observed. Using mean values for each of the model’s parameters (estimated previously for the Lake Kinneret population of St. Peter’s fish) we find that the current care frequencies are unstable and male-only care is the only evolutionarily stable parental care strategy. However, two key model parameters have significant dispersions: the operational sex ratio (OSR) varies both temporally and spatially, and the advantage of biparental care relative to uniparental care depends critically on clutch size, which can vary dramatically. Within the full ranges of observed OSRs and clutch sizes, there are regions in which each of male-only, female-only and biparental care is an evolutionarily stable strategy; there is also a region where no evolutionarily stable strategy exists. Thus natural variations in OSR and clutch size may account for the observed care frequencies. 7 1997 Academic Press Limited