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Enhancing the ecosystem approach for the fishery for Antarctic krill within the complex, variable, and changing ecosystem at South Georgia
ICES Journal of Marine Science ( IF 3.3 ) Pub Date : 2021-04-22 , DOI: 10.1093/icesjms/fsab092
P N Trathan 1 , S Fielding 1 , P R Hollyman 1 , E J Murphy 1 , V Warwick-Evans 1 , M A Collins 1
Affiliation  

The objective of the ecosystem approach to fisheries management is to sustain healthy marine ecosystems and the fisheries they support. One of the earliest implementations was in the Southern Ocean, where decision rules and stock reference points were developed for managing the Antarctic krill fishery, together with an ecosystem-monitoring programme intended to aid management decisions. This latter component has not been incorporated directly into management, so here, we consider variability in the krill fishery at South Georgia, relating it to physical and biological monitoring indices, finding sea surface temperature to be a key correlate with both annual catch and long-term biological indices. Some indices from krill predators showed significant positive relationships with krill harvesting in the preceding winter, presumably indicative of the importance of winter foraging conditions. We explore how ecological structure affects results, examining two monitoring sites 100 km apart. Results suggest different biological conditions at the two sites, probably reflecting different scales of ecosystem operation, emphasizing that an appreciation of scale will enhance krill fishery management. Finally, in reviewing different drivers of ecological change, we identify important additional monitoring that would help better reflect ecosystem status, improve the utility of CEMP, providing information necessary for the ecosystem approach at South Georgia.

中文翻译:

在南乔治亚岛复杂、多变和不断变化的生态系统中加强南极磷虾渔业的生态系统方法

渔业管理生态系统方法的目标是维持健康的海洋生态系统及其支持的渔业。最早的实施之一是在南大洋,在那里制定了管理南极磷虾渔业的决策规则和种群参考点,以及旨在帮助管理决策的生态系统监测计划。后一个组成部分尚未直接纳入管理,因此在这里,我们考虑南乔治亚磷虾渔业的可变性,将其与物理和生物监测指数联系起来,发现海面温度是与年捕捞量和长期捕捞量的关键相关因素。术语生物指数。磷虾捕食者的一些指数与前一个冬季的磷虾捕捞量显示出显着的正相关关系,大概说明了冬季觅食条件的重要性。我们探索生态结构如何影响结果,检查相距 100 公里的两个监测点。结果表明,两个地点的生物条件不同,可能反映了生态系统运行的不同规模,强调规模升值将加强磷虾渔业管理。最后,在审查生态变化的不同驱动因素时,我们确定了重要的额外监测,这将有助于更好地反映生态系统状况,提高 CEMP 的效用,为南乔治亚州的生态系统方法提供必要的信息。可能反映生态系统运行的不同规模,强调规模升值将加强磷虾渔业管理。最后,在审查生态变化的不同驱动因素时,我们确定了重要的额外监测,这将有助于更好地反映生态系统状况,提高 CEMP 的效用,为南乔治亚州的生态系统方法提供必要的信息。可能反映生态系统运行的不同规模,强调规模升值将加强磷虾渔业管理。最后,在审查生态变化的不同驱动因素时,我们确定了重要的额外监测,这将有助于更好地反映生态系统状况,提高 CEMP 的效用,为南乔治亚州的生态系统方法提供必要的信息。
更新日期:2021-04-22
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