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Long-term cyclic persistence in an experimental predator-prey system 期刊论文
NATURE, 2020, 577 (7789) : 226-+
作者:  Blasius, Bernd;  Rudolf, Lars;  Weithoff, Guntram;  Gaedke, Ursula;  Fussmann, Gregor F.
收藏  |  浏览/下载:8/0  |  提交时间:2020/04/16

Predator-prey cycles rank among the most fundamental concepts in ecology, are predicted by the simplest ecological models and enable, theoretically, the indefinite persistence of predator and prey(1-4). However, it remains an open question for how long cyclic dynamics can be self-sustained in real communities. Field observations have been restricted to a few cycle periods(5-8) and experimental studies indicate that oscillations may be short-lived without external stabilizing factors(9-19). Here we performed microcosm experiments with a planktonic predator-prey system and repeatedly observed oscillatory time series of unprecedented length that persisted for up to around 50 cycles or approximately 300 predator generations. The dominant type of dynamics was characterized by regular, coherent oscillations with a nearly constant predator-prey phase difference. Despite constant experimental conditions, we also observed shorter episodes of irregular, non-coherent oscillations without any significant phase relationship. However, the predator-prey system showed a strong tendency to return to the dominant dynamical regime with a defined phase relationship. A mathematical model suggests that stochasticity is probably responsible for the reversible shift from coherent to non-coherent oscillations, a notion that was supported by experiments with external forcing by pulsed nutrient supply. Our findings empirically demonstrate the potential for infinite persistence of predator and prey populations in a cyclic dynamic regime that shows resilience in the presence of stochastic events.


  
Trophic niche segregation allows range-extending coral reef fishes to co-exist with temperate species under climate change 期刊论文
GLOBAL CHANGE BIOLOGY, 2019
作者:  Kingsbury, Kelsey M.;  Gillanders, Bronwyn M.;  Booth, David J.;  Nagelkerken, Ivan
收藏  |  浏览/下载:14/0  |  提交时间:2020/02/17
diet  niche use  ocean warming  range shifts  stable isotopes  
Pulsed seaweed subsidies drive sequential shifts in the effects of lizard predators on island food webs 期刊论文
ECOLOGY LETTERS, 2019, 22 (11) : 1850-1859
作者:  Piovia-Scott, Jonah;  Yang, Louie H.;  Wright, Amber N.;  Spiller, David A.;  Schoener, Thomas W.
收藏  |  浏览/下载:7/0  |  提交时间:2019/11/27
Allochthonous resource  Anolis  diet shift  flexible foraging  numerical response  resource pulse  resource subsidy  temporal variation  transient dynamics  trophic cascade  
Collaborative Research: Comparative feeding by gelatinous grazers on microbial prey 项目
项目编号:1851537; 经费:396702(USD); 起止日期:2019 / dc_date_end
项目负责人:  Kelly Sutherland (Principal Investigator)
收藏  |  浏览/下载:3/0  |  提交时间:2019/11/27
Collaborative Research: Mesoscale variability in nitrogen sources and food-web dynamics supporting larval southern bluefin tuna in the eastern Indian Ocean 项目
项目编号:1851395; 经费:162505(USD); 起止日期:2019 / dc_date_end
项目负责人:  David Die (Principal Investigator)
收藏  |  浏览/下载:22/0  |  提交时间:2019/11/27
Collaborative Research: Comparative feeding by gelatinous grazers on microbial prey 项目
项目编号:1851412; 经费:347810(USD); 起止日期:2019 / dc_date_end
项目负责人:  Anne Thompson (Principal Investigator)
收藏  |  浏览/下载:2/0  |  提交时间:2019/11/27
Collaborative Research: Mesoscale variability in nitrogen sources and food-web dynamics supporting larval southern bluefin tuna in the eastern Indian Ocean 项目
项目编号:1851347; 经费:191840(USD); 起止日期:2019 / dc_date_end
项目负责人:  Sven Kranz (Principal Investigator)
收藏  |  浏览/下载:12/0  |  提交时间:2019/11/27
Collaborative Research: Mesoscale variability in nitrogen sources and food-web dynamics supporting larval southern bluefin tuna in the eastern Indian Ocean 项目
项目编号:1851381; 经费:59732(USD); 起止日期:2019 / dc_date_end
项目负责人:  Karen Selph (Principal Investigator)
收藏  |  浏览/下载:17/0  |  提交时间:2019/11/27
Collaborative Research: Mesoscale variability in nitrogen sources and food-web dynamics supporting larval southern bluefin tuna in the eastern Indian Ocean 项目
项目编号:1851558; 经费:23625(USD); 起止日期:2019 / dc_date_end
项目负责人:  Michael Landry (Principal Investigator)
收藏  |  浏览/下载:6/0  |  提交时间:2019/11/27
Conflicting consequences of climate change for Arctic nesting geese 新闻
来源平台:EurekAlert!. 发布日期:2019
作者:  admin
收藏  |  浏览/下载:0/0  |  提交时间:2019/09/19