Are tuna always hungry? A deep dive into stomach-fullness measures in the western and central Pacific Ocean

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-09-16 DOI:10.1071/mf23174

Pauline Machful, Annie Portal, Jed Macdonald, Valerie Allain, Joe Scutt Phillips, Joanne Potts, Simon Nicol

{"title":"Are tuna always hungry? A deep dive into stomach-fullness measures in the western and central Pacific Ocean","authors":"Pauline Machful, Annie Portal, Jed Macdonald, Valerie Allain, Joe Scutt Phillips, Joanne Potts, Simon Nicol","doi":"10.1071/mf23174","DOIUrl":null,"url":null,"abstract":" ContextUnderstanding tuna diet and its drivers can provide valuable insights into the dynamics of pelagic ecosystems and their capacity to adapt to environmental and human-induced stressors. AimsTo reconstruct tropical tuna dietary histories by using different metrics of stomach fullness and to assess their association with fisheries-related, environmental and biological covariates. MethodsWe examined stomachs from 8229 skipjack (Katsuwonus pelamis), yellowfin (Thunnus albacares) and bigeye tuna (T. obesus) captured in the western and central Pacific Ocean between 2001 and 2021, classified each on the basis of categorical and continuous fullness metrics, then built statistical models to gauge covariate effects. Key resultsOnly models for the binary fullness metric (i.e. empty or non-empty) performed well. Tuna with empty stomachs were more likely to be caught on active gear (e.g. purse seine) and earlier in the day. Skipjack and bigeye tuna with empty stomachs were more likely to be associated with floating objects (e.g. fish-aggregating devices). ConclusionsOur results add to the evidence that tropical tunas forage more effectively during the day and more actively when not associated with floating objects. At the individual level, tuna stomach fullness is highly variable. ImplicationsFurther research is needed to understand the factors governing this promising indicator of ecosystem change.","PeriodicalId":1,"journal":{"name":"Accounts of Chemical Research","volume":null,"pages":null},"PeriodicalIF":16.4000,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Accounts of Chemical Research","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1071/mf23174","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Context

Understanding tuna diet and its drivers can provide valuable insights into the dynamics of pelagic ecosystems and their capacity to adapt to environmental and human-induced stressors.

Aims

To reconstruct tropical tuna dietary histories by using different metrics of stomach fullness and to assess their association with fisheries-related, environmental and biological covariates.

Methods

We examined stomachs from 8229 skipjack (Katsuwonus pelamis), yellowfin (Thunnus albacares) and bigeye tuna (T. obesus) captured in the western and central Pacific Ocean between 2001 and 2021, classified each on the basis of categorical and continuous fullness metrics, then built statistical models to gauge covariate effects.

Key results

Only models for the binary fullness metric (i.e. empty or non-empty) performed well. Tuna with empty stomachs were more likely to be caught on active gear (e.g. purse seine) and earlier in the day. Skipjack and bigeye tuna with empty stomachs were more likely to be associated with floating objects (e.g. fish-aggregating devices).

Conclusions

Our results add to the evidence that tropical tunas forage more effectively during the day and more actively when not associated with floating objects. At the individual level, tuna stomach fullness is highly variable.

Implications

Further research is needed to understand the factors governing this promising indicator of ecosystem change.

查看原文本刊更多论文

金枪鱼总是饥饿吗？深入研究太平洋西部和中部的饱腹感测量方法

背景了解金枪鱼的饮食及其驱动因素可以为了解远洋生态系统的动态及其适应环境和人类引起的压力因素的能力提供有价值的见解。目的通过使用不同的胃饱满度指标重建热带金枪鱼的饮食历史，并评估它们与渔业相关、环境和生物协变量的关系。方法我们研究了2001年至2021年期间在太平洋西部和中部捕获的8229条鲣鱼（Katsuwonus pelamis）、黄鳍金枪鱼（Thunnus albacares）和大眼金枪鱼（T. obesus）的胃，根据分类和连续饱腹度指标对每条金枪鱼进行分类，然后建立统计模型来评估协变量的影响。主要结果只有二元饱腹度量（即空腹或非空腹）模型表现良好。肚子空空的金枪鱼更有可能是在活动渔具（如围网）上捕获的，而且捕获时间更早。空胃的鲣鱼和大眼金枪鱼更有可能与漂浮物（如聚鱼装置）有关。结论我们的研究结果进一步证明，热带金枪鱼在白天与漂浮物无关时觅食更有效、更积极。在个体水平上，金枪鱼胃的饱满度变化很大。意义需要进一步研究，以了解影响这一生态系统变化指标的因素。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

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.