Density‐dependent dispersal complicates spatial synchrony in tri‐trophic food chains

Liu, Zhiguang; Zhang, Fengpan; Hui, Cang

doi:10.1007/s10144-015-0515-0

Cited by 11 publications

(13 citation statements)

References 53 publications

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“…Not surprisingly therefore, density-dependence of dispersal has been thoroughly investigated both theoretically and empirically. Theoretical investigations have focused on the effects of DDD on population distribution (Namba 1980), synchrony (Liu et al 2016), and source-sink dynamics (Amarasekare 2004), as well as the conditions under which DDD is expected to evolve (Travis et al 1999, Metz and Gyllenberg 2001, Poethke and Hovestadt 2002. Empirical studies across multiple taxa show that increased intraspecific competition is expected to drive higher emigration at high densities, leading to positive DDD (De Meester and Bonte 2010, Lutz et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Pre‐dispersal context and presence of opposite sex modulate density dependence and sex bias of dispersal

Mishra

Tung

Sruti

et al. 2018

Oikos

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Density‐dependent dispersal (DDD) has been observed across taxa, and is expected to affect phenomena such as population dynamics, biological invasions, range expansions, and community assembly. However, little is known about whether the patterns of DDD are robust to changes in the environment. For example, the pre‐dispersal context could affect the physiology of organisms, which in turn could alter their DDD. Similarly, in sexually reproducing organisms, males and females might be differentially affected by the environment, with possible changes in their dispersal properties. To investigate some of these issues, we performed three independent experiments using laboratory populations of Drosophila melanogaster, which tested the effects of pre‐dispersal context, sex of the dispersers and presence of mates on DDD. A two‐patch dispersal setup was used to estimate the dispersal propensity and temporal dispersal profile of adult fruit flies. Comparing the data from two different pre‐dispersal contexts (variable and uniform pre‐dispersal adult densities), we found that longer pre‐dispersal exposure to higher densities led to stronger negative DDD in both males and females. Surprisingly, this change in DDD strength was accompanied by a switch in the direction of sex‐biased dispersal: from female‐biased dispersal at a low density to male‐biased dispersal at a high density. Moreover, we found that patterns of both density dependence and sex bias were contingent upon the interaction of males and females, as neither sex exhibited DDD in the absence of the other. Taken together, these results suggest that DDD and sex‐biased dispersal can be labile and be driven by the environmental context. Finally, we discuss the potential implications of these findings in terms of various ecological and evolutionary processes.

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Section: Introductionmentioning

confidence: 99%

Pre‐dispersal context and presence of opposite sex modulate density dependence and sex bias of dispersal

Mishra

Tung

Sruti

et al. 2018

Oikos

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“…Dispersal also enables prey to escape their predators by migrating in a "refuge" patch where they are less abundant. This can be represented by density-dependent dispersal rates, which have a strong impact on dynamics (Hauzy et al, 2010;Liu et al, 2016). However, densitydependent dispersal changes the relative importance of dispersal and local demography as dispersal then scales with biomass similarly to self-regulation or predation, thus changing the interplay between dispersal and biomass distribution.…”

Section: Discussionmentioning

confidence: 99%

Synchrony and Perturbation Transmission in Trophic Metacommunities

Quévreux

Barbier

Loreau

2021

The American Naturalist

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In a world where natural habitats are ever more fragmented, the dynamics of metacommunities are essential to properly understand species responses to perturbations. If species' populations fluctuate asynchronously, the risk of their simultaneous extinction is low, thus reducing the species' regional extinction risk. However, identifying synchronising or desynchronising mechanisms in systems containing several species and when perturbations affect multiple species is challenging. We propose a metacommunity model consisting of two food chains connected by dispersal to study the transmission of small perturbations affecting populations in the vicinity of an equilibrium. In spite of the complex responses produced by such a system, two elements enable us to understand the key processes that rule the synchrony between populations: (1) knowing which species have the strongest response to perturbations and (2) the relative importance of dispersal processes compared with local dynamics for each species. We show that perturbing a species in one patch can lead to asynchrony between patches if the perturbed species is not the most affected by dispersal. The synchrony patterns of rare species are the most sensitive to the relative strength of dispersal to demographic processes, thus making biomass distribution critical to understand the response of trophic metacommunities to perturbations. We further partition the effect of each perturbation on species synchrony when perturbations affect multiple trophic levels. Our approach allows disentangling and predicting the responses of simple trophic metacommunities to perturbations, thus providing a theoretical foundation for future studies considering more complex spatial ecological systems.

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“…Dispersal also enables prey to escape their predators by migrating in a "refuge" patch where they are less abundant. This can be represented by density-dependent dispersal rates, which have a strong impact on dynamics (Hauzy et al, 2010;Liu et al, 2016). However, density-dependent dispersal changes the relative importance of dispersal and local demography as dispersal then scales with biomass similarly to self-regulation or predation, thus changing the interplay between dispersal and biomass distribution.…”

Section: Discussionmentioning

confidence: 99%

Synchrony and perturbation transmission in trophic metacommunities

Quévreux

Barbier

Loreau

2020

Preprint

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In a world where natural habitats are ever more fragmented, the dynamics of metacommunities is essential to properly understand species responses to perturbations. If species' populations fluctuate asynchronously, the risk of their simultaneous extinction is low, thus reducing the species' regional extinction risk. We propose a metacommunity model consisting of two food chains connected by dispersal to study the transmission of small perturbations affecting populations in the vicinity of an equilibrium. We show that perturbing a species in one patch can lead to asynchrony between patches if the perturbed species is not the most affected by dispersal. Dispersal affects rare species the most, thus making biomass distribution critical to understand the response of trophic metacommunities to perturbations. We further partition the effect of each perturbation on species synchrony when several independent perturbations are applied. Our approach allows disentangling and predicting the responses of simple trophic metacommunities to perturbations, thus providing a theoretical foundation for future studies considering more complex spatial ecological systems.

show abstract

Density‐dependent dispersal complicates spatial synchrony in tri‐trophic food chains

Cited by 11 publications

References 53 publications

Pre‐dispersal context and presence of opposite sex modulate density dependence and sex bias of dispersal

Pre‐dispersal context and presence of opposite sex modulate density dependence and sex bias of dispersal

Synchrony and Perturbation Transmission in Trophic Metacommunities

Synchrony and perturbation transmission in trophic metacommunities

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