Behavioral repertoire of Lahille’s bottlenose dolphins that interact with artisanal fishers

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
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引用次数: 0

Abstract

Many human cultures involve positive interactions with wildlife in the past and present. Lahille’s bottlenose dolphins (Tursiops gephyreus), for example, have developed tactics for coastal and estuarine foraging, which sustains a fishing practice known as “cooperative fishing” by traditional fishers in estuaries of southern Brazil. Here, we use aerial footage to describe the behavioral repertoire of the Lahille’s bottlenose dolphins and how it relates to the frequency of net casting by fishers in the Tramandaí Inlet. From nearly 8 h of footage from June 2017 to May 2018, we mainly observed dolphins foraging in the estuary inlet when fishers were present along the shoreline. Dolphins performed at least 27 clearly distinct behaviors and three types of movement patterns. A generalized additive model supported that the fishers interpret a subset of this repertoire (64%) as cues for casting their nets. The behavioral overview of the Lahille’s bottlenose dolphins presented here demonstrates not only a diverse repertoire for this population, but also its clear influence on fishers’ activities. Scientific and traditional perspectives should be integrated to better understand the ecological significance of this “cooperative fishing” for both dolphin populations and fishers that depend on them.

Significance statement

Interactions between different species can be very complex. It is a three-dimensional universe that comprises the behavioral and ecological characteristics of both sides, and then the dynamic they create together. In the case of the “cooperative fishing” between fishers and dolphins in southern Brazil, we still have one dimension to disclose in detail: the dolphins’ behavioral repertoire. Using aerial videos from a drone, we were able to shed light on how those dolphins behave and also how fishers coordinate their activity in response to the dolphins. We also showed that the dolphins’ behavioral repertoire is more diverse than assumed so far. Results suggest that the “cooperative fishing” seems to be based on the human’s perception of an extensive Lahille’s bottlenose dolphin behavioral repertoire during hunting. The knowledge provided here is essential to track the dynamic of this unique interaction in a given space and time.

与个体渔民互动的拉氏瓶鼻海豚的行为曲目
摘要 在过去和现在,许多人类文化都涉及与野生动物的积极互动。例如,拉氏瓶鼻海豚(Tursiops gephyreus)已经形成了在沿海和河口觅食的策略,这种策略维持了巴西南部河口传统渔民称为 "合作捕鱼 "的捕鱼方式。在这里,我们利用航拍镜头来描述拉氏瓶鼻海豚的行为剧目,以及它与特拉曼达伊海湾渔民撒网频率的关系。从 2017 年 6 月至 2018 年 5 月近 8 小时的录像中,我们主要观察到海豚在河口入海口觅食时,捕鱼者出现在海岸线上。海豚至少有 27 种明显不同的行为和 3 种运动模式。广义相加模型证明,渔民将这些行为中的一部分(64%)解释为撒网的提示。本文介绍的拉氏瓶鼻海豚行为概述不仅展示了这一种群的多种行为,而且还展示了其对渔民活动的明显影响。应将科学和传统观点结合起来,以更好地理解这种 "合作捕鱼 "对海豚种群和依赖它们的渔民的生态意义。 意义声明 不同物种之间的相互作用可能非常复杂。这是一个由双方的行为和生态特征以及它们共同创造的动态组成的三维世界。就巴西南部渔民与海豚之间的 "合作捕鱼 "而言,我们仍有一个维度需要详细披露:海豚的行为剧目。利用无人机拍摄的空中视频,我们得以揭示这些海豚的行为方式,以及渔民如何协调他们的活动以应对海豚。我们还发现,海豚的行为剧目比目前假设的更加多样化。研究结果表明,"合作捕鱼 "似乎是基于人类对拉氏瓶鼻海豚在捕猎过程中广泛行为的感知。这里提供的知识对于在特定空间和时间内追踪这种独特互动的动态至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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