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Fluctuating interaction network and time-varying stability of a natural fish community.

Abstract：

:Ecological theory suggests that large-scale patterns such as community stability can be influenced by changes in interspecific interactions that arise from the behavioural and/or physiological responses of individual species varying over time. Although this theory has experimental support, evidence from natural ecosystems is lacking owing to the challenges of tracking rapid changes in interspecific interactions (known to occur on timescales much shorter than a generation time) and then identifying the effect of such changes on large-scale community dynamics. Here, using tools for analysing nonlinear time series and a 12-year-long dataset of fortnightly collected observations on a natural marine fish community in Maizuru Bay, Japan, we show that short-term changes in interaction networks influence overall community dynamics. Among the 15 dominant species, we identify 14 interspecific interactions to construct a dynamic interaction network. We show that the strengths, and even types, of interactions change with time; we also develop a time-varying stability measure based on local Lyapunov stability for attractor dynamics in non-equilibrium nonlinear systems. We use this dynamic stability measure to examine the link between the time-varying interaction network and community stability. We find seasonal patterns in dynamic stability for this fish community that broadly support expectations of current ecological theory. Specifically, the dominance of weak interactions and higher species diversity during summer months are associated with higher dynamic stability and smaller population fluctuations. We suggest that interspecific interactions, community network structure and community stability are dynamic properties, and that linking fluctuating interaction networks to community-level dynamic properties is key to understanding the maintenance of ecological communities in nature.

journal_name

Nature

journal_title

Nature

authors

Ushio M,Hsieh CH,Masuda R,Deyle ER,Ye H,Chang CW,Sugihara G,Kondoh M

doi

10.1038/nature25504

subject

Has Abstract

pub_date

2018-02-15 00:00:00

pages

360-363

issue

7692

eissn

0028-0836

issn

1476-4687

pii

nature25504

journal_volume

554

pub_type

杂志文章

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Fluctuating interaction network and time-varying stability of a natural fish community.