Tropical rays are intrinsically more sensitive to overfishing than the temperate skates
Tropical rays are intrinsically more sensitive to overfishing than the temperate skates
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DOI：
10.1016/j.biocon.2023.110003
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发表时间：
2023-03-29
影响因子：
5.9
通讯作者：
Dulvy, Nicholas K.
中科院分区：
文献类型：
--
作者：
Barrowclift, Ellen;Gravel, Sarah M.;Dulvy, Nicholas K.
过度捕捞、栖息地丧失和气候变化正在导致许多物种的数量下降。了解一个物种从这些和其他威胁中恢复的能力对于优先管理是必要的。最大内在种群增长率（rmax）可以用来比较哪些物种或群体对持续的威胁特别敏感。要调查全球模式的内在敏感性的射线和冰鞋（总目蝙蝠总科），我们计算了rmax的85种使用修改后的欧拉-洛特卡模型，占生存到成熟。我们研究了rmax如何随着体重，温度和深度的变化，通过模型选择，占系统发育的非独立性的信息理论的方法。虽然我们观察到的rmax和温度之间的整体正相关关系，我们发现，温暖，浅水射线更本质上敏感的开发（较低的rmax）比冷，深水冰鞋（较高的rmax）。我们假设，这种模式可能是由它们不同的生殖策略驱动的，因为与产卵的冰鞋相比，活的射线的后代较少，并警告说，未来的研究应该集中在了解青少年和亚成年人死亡时间表的差异上，以了解生存到成熟是否具有可比性。我们的研究结果强调了温暖，浅水射线物种的过度开发和其他威胁，由于其固有的低最大人口增长率的高度脆弱性。rmax的这些差异对我们理解灭绝风险的地理模式具有保护意义，表明热带射线在本质上更敏感。
Overfishing, habitat loss, and climate change are driving population declines in many species. Understanding a species' capacity to recover from these and other threats is necessary for prioritising management. The maximum intrinsic rate of population increase (rmax) can be used to compare which species or groups are particularly sensitive to ongoing threats. To investigate global patterns of intrinsic sensitivity of rays and skates (superorder Batoidea), we calculated rmax of 85 species using a modified Euler-Lotka model that accounts for survival to maturity. We examined how rmax varies with body mass, temperature, and depth using an information-theoretic approach through model selection, accounting for phylogenetic non-independence. Although we observed an overall positive relationship between rmax and temperature, we found that warm, shallow-water rays were more intrinsically sensitive to exploitation (lower rmax) than cold, deep-water skates (higher rmax). We hypothesise that this pattern is likely driven by their different reproductive strategies as live-bearing rays have fewer offspring compared to egg-laying skates, and caution that future research should focus on understanding differences in the mortality schedule of juveniles and sub-adults to understand if survival to maturity is comparable. Our findings highlight the high vulnerability of warm, shallow-water ray species to overexploitation and other threats due to their intrinsically low maximum population growth rates. These differences in rmax have conservation implica-tions for our understanding of the geographic patterns in extinction risk, suggesting that tropical rays are more intrinsically sensitive.