Strengthening of negative density dependence mediates population decline at high temperatures

IF 4.4 2区 环境科学与生态学 Q1 ECOLOGY
Ecology Pub Date : 2025-03-03 DOI:10.1002/ecy.70030
Lillie Stockseth, Zoey Neale, Volker H. W. Rudolf
{"title":"Strengthening of negative density dependence mediates population decline at high temperatures","authors":"Lillie Stockseth,&nbsp;Zoey Neale,&nbsp;Volker H. W. Rudolf","doi":"10.1002/ecy.70030","DOIUrl":null,"url":null,"abstract":"<p>While temperature is well known to affect many life history traits of ectothermic organisms, any attempt to scale up these individual-level processes to population-level consequences must assume a relationship between temperature and the strength of per capita density dependence. Yet, theory has made contrasting predictions about this relationship, and we still need clear experimental tests to determine which relationship is realized in natural systems, especially in heterotrophs. Here, we experimentally isolated and quantified the thermal response of density dependence from the population dynamics of the herbivore <i>Daphnia pulex</i>. We show that the strength of negative density dependence increased linearly with temperature, doubling every 7°C, while the intrinsic growth rate of increase showed a humped shape relationship. This difference caused a humped-shaped relationship of carrying capacity with temperature, with a dramatic 50% decline at the highest temperature. The results provide a sorely needed test of theory and highlight the importance of accounting for thermal responses of indirect effects that only emerge at the population level when forecasting the effects of global warming. While warming temperatures may benefit the individual (via increased growth and reproduction), our results reveal that warming still can be a detriment to the population by strengthening density-dependent processes.</p>","PeriodicalId":11484,"journal":{"name":"Ecology","volume":"106 3","pages":""},"PeriodicalIF":4.4000,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ecy.70030","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ecology","FirstCategoryId":"93","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/ecy.70030","RegionNum":2,"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

While temperature is well known to affect many life history traits of ectothermic organisms, any attempt to scale up these individual-level processes to population-level consequences must assume a relationship between temperature and the strength of per capita density dependence. Yet, theory has made contrasting predictions about this relationship, and we still need clear experimental tests to determine which relationship is realized in natural systems, especially in heterotrophs. Here, we experimentally isolated and quantified the thermal response of density dependence from the population dynamics of the herbivore Daphnia pulex. We show that the strength of negative density dependence increased linearly with temperature, doubling every 7°C, while the intrinsic growth rate of increase showed a humped shape relationship. This difference caused a humped-shaped relationship of carrying capacity with temperature, with a dramatic 50% decline at the highest temperature. The results provide a sorely needed test of theory and highlight the importance of accounting for thermal responses of indirect effects that only emerge at the population level when forecasting the effects of global warming. While warming temperatures may benefit the individual (via increased growth and reproduction), our results reveal that warming still can be a detriment to the population by strengthening density-dependent processes.

Abstract Image

负密度依赖性的加强介导了高温下的种群数量下降
虽然众所周知,温度会影响恒温生物的许多生活史特征,但任何将这些个体水平的过程扩大到种群水平的结果的尝试,都必须假设温度与人均密度依赖的强度之间存在关系。然而,理论对这种关系做出了截然不同的预测,我们仍然需要明确的实验测试来确定哪种关系在自然系统中实现,特别是在异养生物中。本文通过实验分离和量化了草食动物水蚤种群动态中密度依赖的热响应。我们发现,负密度依赖的强度随温度线性增加,每7°C增加一倍,而内在增长率呈驼峰状关系。这种差异导致承载能力与温度呈驼峰状关系,在最高温度下急剧下降50%。这些结果提供了一个急需的理论测试,并强调了在预测全球变暖的影响时,只在人口水平上出现的间接影响的热响应的重要性。虽然变暖的温度可能有利于个体(通过增加生长和繁殖),但我们的研究结果表明,变暖仍然可以通过加强密度依赖过程对种群造成损害。
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
Ecology
Ecology 环境科学-生态学
CiteScore
8.30
自引率
2.10%
发文量
332
审稿时长
3 months
期刊介绍: Ecology publishes articles that report on the basic elements of ecological research. Emphasis is placed on concise, clear articles documenting important ecological phenomena. The journal publishes a broad array of research that includes a rapidly expanding envelope of subject matter, techniques, approaches, and concepts: paleoecology through present-day phenomena; evolutionary, population, physiological, community, and ecosystem ecology, as well as biogeochemistry; inclusive of descriptive, comparative, experimental, mathematical, statistical, and interdisciplinary approaches.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信