密集的海收获重新削弱了Paracentrotus lividus的种群结构,并威胁到自给自足

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Nicole Ruberti¹, Gianni Brundu², Giulia Ceccherelli^3,4

¹Department of Architecture, Design and Planning, University of Sassari, Sassari, Italy.

|November 29, 2023

概括

强化采集可食用海 (Paracentrotus lividus),在五年内大幅减少了40%的种群生殖潜力. 这种规模选择性捕捞对物种产生影响.

科学领域:

海洋生态海洋生态学
渔业科学渔业科学
保护生物学保护生物学

背景情况:

可食用海Paracentrotus lividus的密集采集在西地中海地区普遍存在.
选择性去除大型个体可以减少种群规模和缩小规模类别,危及自给自足.
了解采摘对生殖潜力的影响对于可持续管理至关重要.

研究的目的:

评估五年来Paracentrotus lividus种群生殖潜力的年比年变化.
为了比较一个被采集的热点与一个受保护的海洋区域中的生殖潜力.
评估大小选择性采摘对人口生殖产量的影响.

主要方法:

在撒丁岛的一个收获热点,每月抽取商业和非商业大小的个体,长达五年.
估计繁殖动物的淋巴体索引 (GSI) 和个体雌激素产量 (IGO).
计算总子产量 (TGO) 和与海洋保护区种群进行比较.

主要成果:

在五年内或与受保护群体相比,没有观察到GSI和IGO的显著变化.
密集的采摘导致不足商业规模的个体减少了一半,总人口的生殖潜力减少了40%.
尽管密度减少,但平均IGO增加,这表明幸存者可能进行生殖投资.

结论:

尺寸选择性采摘直接导致对Paracentrotus lividus的种群自我维持的快速丧失.
这项研究强调了改变人口体型结构对功能特征的间接影响.
这些发现对于海的可持续开发和生态系统保护管理至关重要.

关键词:

生态保护保护生态渔业管理渔业管理淋巴体上腺体指数 (GONADOSOMATIC INDEX) 是一个指数.生殖潜力繁殖潜力海的过度采集海的过度采集海是一种海.根据大小选择性采摘.

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