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首页> 外文期刊>ICES Journal of Marine Science >Evaluating the impacts of fishing on sex-changing fish: a game-theoretic approach
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Evaluating the impacts of fishing on sex-changing fish: a game-theoretic approach

机译：评估捕鱼对变性鱼的影响：一种博弈论方法

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Sex change has been widely documented in many commercially and recreationally important fish species, yet the implications of this life history trait are not considered in most stock assessments. This omission can lead to poor estimates of parameters vital to understanding the health of sequentially hermaphroditic stocks. Here, we present a game theoretic approach to model the sex changing behaviour of a stock of protogynous (female first) hermaphroditic fish and produce estimates of maximum sustainable yield (MSY), equilibrium biomass at MSY (BMSY) and sex ratio, then compare these reference points to those from an otherwise identical gonochoristic (non-sex changing) stock. We tested each stock at varying levels of exploitation and with a range of assumptions about how sex ratio impacts fertilization rate. We show that a protogynous hermaphroditic stock with flexible timing of sex change produces similar MSY and slightly higher BMSY than a gonochoristic stock with otherwise identical vital rates. Sex changing stocks were also able to maintain a higher proportion of males in the population than did non-sex changing stocks as exploitation increased. Although sex changing stocks were able to maintain their sex ratio, the age at which females changed sex decreased with increased exploitation, suggesting smaller body size, and presumably lower fecundity, for females in heavily exploited sex changing stocks. Our game theoretic approach to evaluating hermaphroditic stocks can accommodate a wide variety of sex changing cues and behaviours and allows a flexible model for understanding the effects of exploitation on hermaphroditic stocks.
机译：性别变化已在许多具有商业意义和娱乐意义的重要鱼类中得到了广泛的记录，但是这种生命史特征的影响在大多数种群评估中并未考虑。遗漏会导致对了解顺序雌雄同体种群的健康状况至关重要的参数的估计不足。在这里，我们提出一种博弈论方法来模拟雌性（雌性第一）雌雄同体鱼类种群的性别变化行为，并得出最大可持续产量（MSY），MSY平衡生物量（BMSY）和性别比的估计值，然后进行比较参考指向那些来自其他相同性别（非变性）股票的股票。我们在不同的开采水平下对每种种群进行了测试，并就性别比如何影响施肥率进行了一系列假设。我们显示，具有灵活的性别变化时机的原生雌雄同体种群产生的MSY和略高于具有其他生命率的生殖器种群的BMSY。随着剥削的增加，与不改变性别的种群相比，改变性别的种群也能够维持较高的男性比例。尽管变性种群能够维持其性别比例，但对于被大量利用的变性种群的女性来说，随着剥削的增加女性改变性别的年龄下降，这表明其体型较小，而生殖力较低。我们用于评估雌雄同体种群的博弈论方法可以适应各种各样的性别变化线索和行为，并为了解剥削对雌雄同体种群的影响提供了灵活的模型。

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