Near disappearance of the Angelshark Squatina squatina over half a century of observations

Near disappearance of the Angelshark Squatina squatina over half a century of observations
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经过半个多世纪的观察,天使鲨几乎消失了

DOI:
10.1111/csp2.97
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发表时间:
2019
影响因子:
3.1
通讯作者:
Hiddink J
Hiddink J
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Hiddink J

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海洋生物的灭绝尤其难以发现,几乎所有的物种都是在事后才被发现的。回顾性分析是必要的,以避免在发生灭绝时得出结论。我们利用访谈和机会记录重建了天使鲨在前热点地区(威尔士)的种群轨迹。在校正了观察努力和回忆偏差后,我们估计在46年内丰度下降了70%(1.5%/年)。虽然以前分布广泛,但Angelshark的分布收缩到卡迪根湾的中心核心。在世界上监测最好、管理最集中的海域之一,天使鲨几乎没有被注意到。限制在卡迪根湾的石礁上撒网,可减少副渔获量。我们提供了第一个定量时间序列,揭示了威尔士沿海水域天使鲨数量下降的时间和轨迹,并揭示了丰富和残余种群的历史中心,为保护重点提供了第一个机会。
Marine extinctions are particularly difficult to detect and almost all have been discovered after the fact. Retrospective analyses are essential to avoid concluding no‐extinction when one has occurred. We reconstruct the Angelshark population trajectory in a former hotspot (Wales), using interviews and opportunistic records. After correcting for observation effort and recall bias, we estimate a 70% (1.5%/year) decline in abundance over 46 years. While formerly widespread, Angelshark distribution contracted to a central core of Cardigan Bay. Angelshark declined almost unnoticed in one of the best‐monitored and most intensively managed seas in the world. Bycatch may be minimized by limiting netting on shingle reefs in Cardigan Bay. We provide the first quantitative time series to reveal the timing and trajectory of decline of Angelshark in the coastal waters of Wales and uncover historical centers of abundance and remnant populations that provide the first opportunity for the focus of conservation.
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