I sink therefore I am: 20 years of tagging small cetacean carcasses in the North-East Atlantic for bycatch estimation

IF 2.5 3区 环境科学与生态学 Q2 BIODIVERSITY CONSERVATION
Hélène Peltier , Matthieu Authier , Willy Dabin , Pierre Daniel , Cécile Dars , Fabien Demaret , Eleonore Meheust , Vincent Ridoux , Jérôme Spitz , Olivier Van Canneyt
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引用次数: 0

Abstract

For common dolphin (Delphinus delphis Linnaeus, 1758) and harbour porpoise (Phocoena phocoena Linnaeus, 1758), bycatch levels exceed the thresholds in the North-East Atlantic. Reverse drift modelling was developed to infer bycatch from stranding data. It is then necessary to define three parameters: the proportion of carcasses that float, the probability of a floating carcass drifting until stranding; and finally, the proportion of beached carcasses that are discovered and reported. The proportion of floating carcasses is the most influential corrective factor in the reverse drift modelling process. The objective of this study is to provide a better estimation of this proportion following bycatch in fishing gear. The predicted drift of 455 common dolphins and harbour porpoises that were tagged and discarded by fishing vessels was calculated by a drift prediction model (MOTHY). Of the tags deployed, stranding was predicted for 309 carcasses (278 common dolphins and 31 harbour porpoises), and 84 animals were discovered (78 common dolphins and 6 harbour porpoises). Bycatch in trammel nets and in midwater pair trawls resulted in a higher probability of these carcasses being recovered stranded. The predicted duration of the drift, on the other hand, had a negative effect on the number of strandings observed. The percentage of harbour porpoises that float was 27% (95% CI [12%,43%]), while it was 31% (95% CI [24%, 39%]) for common dolphins. These results contribute to the improvement of estimates of bycatch of small cetaceans inferred from strandings, which are used to inform conservation measures, particularly for the common dolphin in the North-East Atlantic.
20年来,我在东北大西洋为估计副渔获物而标记小型鲸类动物的尸体
在东北大西洋,普通海豚(Delphinus delphis Linnaeus, 1758年)和港湾鼠海豚(Phocoena Phocoena Linnaeus, 1758年)的副渔获量超过了阈值。开发了逆漂模型,从搁浅数据推断副渔获量。然后有必要定义三个参数:漂浮的尸体比例,漂浮的尸体漂流直到搁浅的概率;最后,被发现和报告的搁浅动物尸体的比例。在反漂建模过程中,浮尸比例是影响最大的校正因子。本研究的目的是更好地估计渔具附带渔获物所占的比例。利用MOTHY漂量预测模型,对455头被渔船贴标丢弃的白海豚和港鼠海豚的漂量进行了预测。在这些标签中,预计有309具尸体(278具普通海豚和31具港湾鼠海豚)搁浅,并发现84具动物(78具普通海豚和6具港湾鼠海豚)。束缚网和水中双拖网的副捕获导致这些尸体被搁浅的可能性更高。另一方面,预测的漂流持续时间对观察到的搁浅数量有负面影响。港湾鼠海豚漂浮的比例为27% (95% CI[12%,43%]),而普通海豚则为31% (95% CI[24%, 39%])。这些结果有助于改进从搁浅中推断出的小型鲸类附带捕获量的估计,这些估计用于为保护措施提供信息,特别是对东北大西洋的普通海豚。
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来源期刊
Journal for Nature Conservation
Journal for Nature Conservation 环境科学-生态学
CiteScore
3.70
自引率
5.00%
发文量
151
审稿时长
7.9 weeks
期刊介绍: The Journal for Nature Conservation addresses concepts, methods and techniques for nature conservation. This international and interdisciplinary journal encourages collaboration between scientists and practitioners, including the integration of biodiversity issues with social and economic concepts. Therefore, conceptual, technical and methodological papers, as well as reviews, research papers, and short communications are welcomed from a wide range of disciplines, including theoretical ecology, landscape ecology, restoration ecology, ecological modelling, and others, provided that there is a clear connection and immediate relevance to nature conservation. Manuscripts without any immediate conservation context, such as inventories, distribution modelling, genetic studies, animal behaviour, plant physiology, will not be considered for this journal; though such data may be useful for conservationists and managers in the future, this is outside of the current scope of the journal.
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