Indirect Effects of Temperature Drive Gradients in Fish Food Web Properties

IF 6 1区环境科学与生态学 Q1 ECOLOGY

Global Ecology and Biogeography Pub Date : 2025-08-31 DOI:10.1111/geb.70110

Azenor Bideault, Matthieu Barbier, Arnaud Sentis, Michel Loreau, Dominique Gravel

{"title":"Indirect Effects of Temperature Drive Gradients in Fish Food Web Properties","authors":"Azenor Bideault, Matthieu Barbier, Arnaud Sentis, Michel Loreau, Dominique Gravel","doi":"10.1111/geb.70110","DOIUrl":null,"url":null,"abstract":"<div>\n \n \n <section>\n \n <h3> Aim</h3>\n \n <p>Understanding the direct (e.g., on biological rates) and indirect (e.g., through changes in species richness) effects of temperature on food web properties, in the context of latitudinal gradients and climate warming. We focus on species interactions and predict variations in two metrics of food web properties: trophic control and temporal variability.</p>\n </section>\n \n <section>\n \n <h3> Location</h3>\n \n <p>Global oceans.</p>\n </section>\n \n <section>\n \n <h3> Time Period</h3>\n \n <p>2001–2018.</p>\n </section>\n \n <section>\n \n <h3> Major Taxa Studied</h3>\n \n <p>Marine fish species.</p>\n </section>\n \n <section>\n \n <h3> Methods</h3>\n \n <p>We use a modelling approach coupled with a global dataset of fish food webs. Species occurrences are obtained from data sources, while trophic interactions are predicted by a size-based niche model calibrated with a global interaction dataset. Interaction strengths are constrained by allometric scaling laws for predation and biomass. We investigate how predictors varying with latitude (temperature, species richness, productivity, food web structure) drive latitudinal variations in trophic regulation and variability.</p>\n </section>\n \n <section>\n \n <h3> Results</h3>\n \n <p>Our results suggest a latitudinal gradient in two metrics of community dynamics, with both trophic feedback strength (underlying phenomena such as cycles and cascades) and temporal stability increasing with latitude. In our model, this variation is tied directly and indirectly to temperature, and we find that direct effects of temperature are weaker than (or at most equal to) indirect effects. The direct effect on interaction rates decreases trophic feedbacks yet increases variability. The organism-level temperature–size rule is found to increase both feedback and variability. Finally, community-level indirect effects (species richness and connectance) impact trophic control but not variability. Climate warming moderately affects trophic control, variability and total biomass, but more strongly alters individual species biomass.</p>\n </section>\n \n <section>\n \n <h3> Main Conclusions</h3>\n \n <p>Our study improves understanding of the drivers of latitudinal variation in food web properties and helps disentangle the direct and indirect effects of temperature. Indirect effects are predicted to drive biogeographic variation in food web properties, while direct effects such as short-term warming could have stronger consequences at the species level.</p>\n </section>\n </div>","PeriodicalId":176,"journal":{"name":"Global Ecology and Biogeography","volume":"34 9","pages":""},"PeriodicalIF":6.0000,"publicationDate":"2025-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/geb.70110","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Global Ecology and Biogeography","FirstCategoryId":"93","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/geb.70110","RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ECOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

Aim

Understanding the direct (e.g., on biological rates) and indirect (e.g., through changes in species richness) effects of temperature on food web properties, in the context of latitudinal gradients and climate warming. We focus on species interactions and predict variations in two metrics of food web properties: trophic control and temporal variability.

Location

Global oceans.

Time Period

2001–2018.

Major Taxa Studied

Marine fish species.

Methods

We use a modelling approach coupled with a global dataset of fish food webs. Species occurrences are obtained from data sources, while trophic interactions are predicted by a size-based niche model calibrated with a global interaction dataset. Interaction strengths are constrained by allometric scaling laws for predation and biomass. We investigate how predictors varying with latitude (temperature, species richness, productivity, food web structure) drive latitudinal variations in trophic regulation and variability.

Results

Our results suggest a latitudinal gradient in two metrics of community dynamics, with both trophic feedback strength (underlying phenomena such as cycles and cascades) and temporal stability increasing with latitude. In our model, this variation is tied directly and indirectly to temperature, and we find that direct effects of temperature are weaker than (or at most equal to) indirect effects. The direct effect on interaction rates decreases trophic feedbacks yet increases variability. The organism-level temperature–size rule is found to increase both feedback and variability. Finally, community-level indirect effects (species richness and connectance) impact trophic control but not variability. Climate warming moderately affects trophic control, variability and total biomass, but more strongly alters individual species biomass.

Main Conclusions

Our study improves understanding of the drivers of latitudinal variation in food web properties and helps disentangle the direct and indirect effects of temperature. Indirect effects are predicted to drive biogeographic variation in food web properties, while direct effects such as short-term warming could have stronger consequences at the species level.

Abstract Image

查看原文本刊更多论文

温度驱动梯度对鱼类食物网特性的间接影响

目的了解在纬度梯度和气候变暖的背景下，温度对食物网特性的直接影响（如对生物速率的影响）和间接影响（如通过物种丰富度的变化）。我们关注物种的相互作用，并预测食物网属性的两个指标的变化：营养控制和时间变异。全球海洋。时间范围2001-2018。主要分类群研究海洋鱼类。方法采用建模方法，结合全球鱼食网数据集。物种发生率从数据源获得，而营养相互作用是通过基于尺寸的生态位模型与全球相互作用数据集校准来预测的。相互作用强度受捕食和生物量异速缩放规律的制约。我们研究了随纬度变化的预测因子（温度、物种丰富度、生产力、食物网结构）如何驱动营养调节和变异的纬度变化。结果群落动态的两个指标存在纬度梯度，营养反馈强度（潜在现象如循环和级联）和时间稳定性随纬度增加而增加。在我们的模型中，这种变化与温度直接或间接地联系在一起，我们发现温度的直接影响比间接影响弱（或最多等于）。对相互作用速率的直接影响减少了营养反馈，但增加了变异。发现有机体水平的温度-尺寸规则增加了反馈和可变性。最后，群落水平的间接效应（物种丰富度和连通性）影响营养控制，但不影响变异。气候变暖适度影响营养控制、变率和总生物量，但更强烈地改变了单个物种生物量。我们的研究提高了对食物网特性纬度变化驱动因素的理解，并有助于理清温度的直接和间接影响。据预测，间接影响将推动食物网特性的生物地理变异，而短期变暖等直接影响可能在物种水平上产生更强的后果。

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

Global Ecology and Biogeography 环境科学-生态学

CiteScore

12.10

自引率

3.10%

发文量

170

审稿时长

3 months

期刊介绍： Global Ecology and Biogeography (GEB) welcomes papers that investigate broad-scale (in space, time and/or taxonomy), general patterns in the organization of ecological systems and assemblages, and the processes that underlie them. In particular, GEB welcomes studies that use macroecological methods, comparative analyses, meta-analyses, reviews, spatial analyses and modelling to arrive at general, conceptual conclusions. Studies in GEB need not be global in spatial extent, but the conclusions and implications of the study must be relevant to ecologists and biogeographers globally, rather than being limited to local areas, or specific taxa. Similarly, GEB is not limited to spatial studies; we are equally interested in the general patterns of nature through time, among taxa (e.g., body sizes, dispersal abilities), through the course of evolution, etc. Further, GEB welcomes papers that investigate general impacts of human activities on ecological systems in accordance with the above criteria.