How does adaptive consumer movement affect population dynamics in consumer–resource metacommunities with homogeneous patches?

Abrams, Peter A.; Ruokolainen, Lasse

doi:10.1016/j.jtbi.2011.02.019

Cited by 28 publications

(34 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In previous models of one species population performing fitness-dependent dispersal, population asynchrony is viewed as a stabilizing factor that reduces total population fluctuation (e.g. [31], [32]). However, our results suggest that asynchrony in consumer population sizes is coupled with asynchrony in resource levels (as in [31], [32]), which could make the system more susceptible to the invasion of adaptive disperser.…”

Section: Discussionmentioning

confidence: 99%

“…In the context of competition, density-dependent dispersal is also used to explain coexistence pattern [28], and it realizes the spatially segregated distribution of populations, which, promotes coexistence of directly-competing species whose competition outcomes are otherwise determined by priority effect [29]. Directed dispersal based on fitness differences between patches are also studied in the single species context, and theoretical studies show that this fitness-dependent dispersal can affect resource distribution [30] and stabilize total population size by creating asynchrony of population sizes and resource levels among patches [31], [32]. Fitness-dependent dispersal is also known to affect species interaction with its predator [33], [34].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Difference Inadaptive Dispersal Ability Can Promote Species Coexistence in Fluctuating Environments

2013

View full text Add to dashboard Cite

Theories and empirical evidence suggest that random dispersal of organisms promotes species coexistence in spatially structured environments. However, directed dispersal, where movement is adjusted with fitness-related cues, is less explored in studies of dispersal-mediated coexistence. Here, we present a metacommunity model of two consumers exhibiting directed dispersal and competing for a single resource. Our results indicated that directed dispersal promotes coexistence through two distinct mechanisms, depending on the adaptiveness of dispersal. Maladaptive directed dispersal may promote coexistence similar to random dispersal. More importantly, directed dispersal is adaptive when dispersers track patches of increased resources in fluctuating environments. Coexistence is promoted under increased adaptive dispersal ability of the inferior competitor relative to the superior competitor. This newly described dispersal-mediated coexistence mechanism is likely favored by natural selection under the trade-off between competitive and adaptive dispersal abilities.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Difference Inadaptive Dispersal Ability Can Promote Species Coexistence in Fluctuating Environments

2013

View full text Add to dashboard Cite

show abstract

“…35 We limit the density-dependent response of prey to predation risk rather than to their total fitness. 3 Specifically, densitydependent dispersal is proportional to the per capita (of prey) predation rate. It increases as the density of predators increases but decreases as the density of prey increases since the individual predation risk decreases.…”

Section: A the Ecological Modelmentioning

confidence: 99%

“…Because we highlight the role of non-consumptive effects of predation on synchrony through predator avoidance, our results also contribute to the integration between theories of metacommunities and of trait-mediated indirect interactions. 3,33 Finally, the importance of landscape feature for movement of organisms has been investigated through habitat fragmentation and corridors, which are often assumed to affect the rate of movement between habitats in theoretical studies. Our analysis shows that the temporal scales of movements driven by both landscape properties and behavior are key for explaining the maintenance of heterogeneity across weakly connected communities.…”

Section: A Interactions Between Time To Movement and Travel Timementioning

confidence: 99%

How robust is dispersal-induced spatial synchrony?

Zhang

Lutscher

Guichard

2015

Chaos: An Interdisciplinary Journal of Nonlinear Science

View full text Add to dashboard Cite

Many biological populations fluctuate in synchrony over large geographic regions. This behavior may increase the chance of extinction. The combination of time-scale separation between interacting species and weak spatial linear diffusive coupling is one mechanism that can generate synchrony; however, accounting for travel time between habitat patches may destabilize this synchrony. Here, we show that ubiquitous behavioral aspects of dispersal (e.g., predator avoidance), implemented as nonlinear diffusive coupling, may also destabilize synchrony. In addition, these aspects interact with travel-time delays and amplify mechanisms that destroy synchrony. Our work suggests that dispersal-induced synchrony is more rare than typically assumed.

show abstract

“…Following earlier work on adaptive consumer foraging, parameter values are chosen to generate cyclic population dynamics in the absence of consumer adaptation and environmental stochasticity (e.g., Abrams and Ruokolainen, 2011;Rooney et al, 2006;Vasseur and Fox, 2007). We set r i ¼0.65, k i ¼ 1, b¼0.25, I i ¼ 0.65, B 0 ¼ 0.15, e¼ 0.5, and d ¼0.1.…”

Section: Food Web Modelmentioning

confidence: 99%

Environmental weakening of trophic interactions drives stability in stochastic food webs

Ruokolainen

McCann

2013

Journal of Theoretical Biology

Self Cite

View full text Add to dashboard Cite

A 3-species food web model is analysed, with stochastic variation in parameters. Noise affects either resource growth or consumer intake as a Gaussian function. Noise variance, colour, and the consumers foraging adaptation rate is varied. Environmental characteristics impact on the consumer-resource interaction strength. Noise impact on population variability depends on where it hits in the food web. a r t i c l e i n f o t r a c tThe physiological performance and behaviour of organisms are contingent on environmental conditions. When these conditions vary over time, this can have important consequences for the dynamics of individual populations and entire species communities. While the importance of environmental variation on the structuring and stability of natural food webs is recognised, little work has been done so far to build up a theoretical understanding of these processes. Here we investigate a simple model food web, where a consumer species forages flexibly upon two distinct, inter-competing resource species. Resource productivities or the resource intake rates by the consumer are assumed to depend on environmental conditions in a realistic manner. Fluctuations in these parameters drive variation in the strength of consumer-resource interactions, depending on whether the resource or the consumer is sensitive to environmental noise. The way resources and the consumer respond to changes in environmental conditions stems from the deterministic influence of each stochastic parameter on food web dynamics, which interact with the consumer adaptation process as well as between-resource competition. According to recent empirical reports, the mechanisms behind our results are likely to be relevant in natural systems and thus the model predictions are of potential importance in understanding food web responses to environmental stochasticity in general.

show abstract

How does adaptive consumer movement affect population dynamics in consumer–resource metacommunities with homogeneous patches?

Cited by 28 publications

References 47 publications

Difference Inadaptive Dispersal Ability Can Promote Species Coexistence in Fluctuating Environments

Difference Inadaptive Dispersal Ability Can Promote Species Coexistence in Fluctuating Environments

How robust is dispersal-induced spatial synchrony?

Environmental weakening of trophic interactions drives stability in stochastic food webs

Contact Info

Product

Resources

About