Dynamic versus Instantaneous Models of Diet Choice

Brian, O.; Abrams, Peter A.; Brassil, Chad E.

doi:10.1086/378783

Cited by 41 publications

(35 citation statements)

References 49 publications

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“…Instability due to adaptive behavior by the middle species in a three-species food chain was demonstrated in Abrams (2003); in this case, the instability was due to a trade-off between foraging and defense that involved a fitness-minimizing equilibrium. Abrams (1999) and Ma et al (2003) showed that the lags in food choice could greatly alter the dynamics of a one-predator-two-prey model that cycled even in the absence of behavioral choice. Finally, Abrams (2007) and Abrams et al (2007) provided examples of instability arising from the combination of adaptive movement between patches and interspecific interactions within patches for systems with a three-species food chain (Abrams 2007) and a pair of competing species ).…”

Section: Twelve Questions About Choice Of Resourcementioning

confidence: 99%

Quantitative descriptions of resource choice in ecological models

Abrams

2009

Population Ecology

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This article reviews the subject of resource choice by consumers. It is concerned with how such choice has been and should be represented in quantitative ecological models. This requires consideration of the dynamics of behavioral change and the fitness consequences of different resource intake rates. The topic is important because of the impact of choice on the functional response of the consumer to each of the resources it consumes. A variety of open questions related to choice are addressed. These include: the relationship between optimal diet choice and switching; the relationship between adaptive choice of two or resources and type-3 functional responses to a single resource; whether switching behavior requires choice and whether choice always results in switching behavior; why partial preferences are observed; whether choice between habitats is fundamentally different from choice within habitats; how between-individual variation in parameters related to resource use alters functional responses measured at the population level. The impacts of choice on stability are discussed briefly. The costs of increased resource use and the type of nutritional interactions between resources are particularly important determinants of adaptive resource choice, and are considered in some detail.

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Section: Twelve Questions About Choice Of Resourcementioning

confidence: 99%

Quantitative descriptions of resource choice in ecological models

Abrams

2009

Population Ecology

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“…The work presented here highlights the complexity of behavioural (within-generation) dynamics that can be lost in (between-generation) population dynamic models (Mangel and Roitberg 1992;Bolker et al 2003;Ma et al 2003;Persson and De Roos 2003). Adaptive host selection (or in the case of predator-prey interactions, adaptive diet choice) is thought to be a stabilizing process (Comins and Hassell 1979;Fryxell and Lundberg 1994).…”

Section: Discussionmentioning

confidence: 99%

“…However, the presence of smaller parasitoids may mitigate this effect, as they will generally select smaller hosts. Temporal refuges will create time-lagged responses by parasitoids (or predators), which may destabilize population dynamics (Gurney and Nisbet 1985;Ma et al 2003;Pachepsky et al 2008). The influence of this trait-mediated interaction on between-generation dynamics has yet to be fully explored.…”

Section: Discussionmentioning

confidence: 99%

“…Werner et al 1983;Beckerman et al 1997;Luttbeg and Schmitz 2000;Peacor and Werner 2001). An extensive body of theory has been developed that extends individual-level behaviour into a community ecology framework (Dill 1987;Fryxell and Lundberg 1994;Ma et al 2003;Persson and De Roos 2003). In hostparasitoid systems, a parasitoid's choice of habitat, host species or host size may influence parasitoid-host dynamics (Mangel and Roitberg 1992), which in turn can produce cascading effects on populations that shape the structure of communities (Petchey et al2008).…”

Section: Introductionmentioning

confidence: 99%

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Size-mediated adaptive foraging: a host-selection strategy for insect parasitoids

2009

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Foraging models are useful tools for generating predictions on predator-prey interactions, such as habitat or diet choice. However, the majority of studies attempting to explain adaptive behaviour using optimality criteria have assumed that there is no trait (e.g. size) variation among individual consumers or their prey. Hymenopteran parasitoids that attack the free-living stages of their host are an ideal system for studying the influence of body size on host selection because of the wide range of adult parasitoid sizes coupled with the defensive capabilities of their hosts. We report here our application of an experimentally parameterized host selection model to investigate the influence of parasitoid body size on the range of acceptable host instar classes. Using a demographic model, we compared the efficiency of parasitoids using an optimal host selection strategy against parasitoids using an indiscriminate host selection strategy over a range of different parasitoid body sizes. Net fitness accrual of parasitoids and the impact of host instar selection on aphid recruitment were assessed on different stage-structured aphid populations. Our results demonstrate that optimal host selection allows larger parasitoids to utilize a wider range of hosts. However, smaller parasitoids receive the greatest benefits from selecting hosts optimally by utilizing a restricted range of small, poorly defended hosts when they are abundant. We argue that the correlation between flexible host selection behaviour and adult body size may be a general phenomenon that applies to the majority of hymenopteran parasitoids that attack free-living, well-defended hosts. The potential of within-generation behavioural interactions to impact between-generation dynamics in host-parasitoid populations are discussed.

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“…Adaptive behaviour is considered to be important for shaping local (Abrams and Matsuda, 2004;Abrams, 2000;Ma et al, 2003;Post et al, 2000;Teng and McCann, 2004) and regional Abrams et al, 2012;Amarasekare, 2008Amarasekare, , 2007Ruokolainen et al, 2011) population dynamics, food web structure (e.g., Beckerman et al, 2006;Heckmann et al, 2012), and species persistence (Kondoh, 2006(Kondoh, , 2003Uchida and Drossel, 2007). Dynamic coupling of distinct food chains by an actively foraging top predator is regarded as important for community stability (e.g., Abrams, 2000;McCann et al, 2005;Rooney et al, 2008;Teng and McCann, 2004).…”

Section: Introductionmentioning

confidence: 99%

Environmental weakening of trophic interactions drives stability in stochastic food webs

Ruokolainen

McCann

2013

Journal of Theoretical Biology

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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.

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Dynamic versus Instantaneous Models of Diet Choice

Cited by 41 publications

References 49 publications

Quantitative descriptions of resource choice in ecological models

Quantitative descriptions of resource choice in ecological models

Size-mediated adaptive foraging: a host-selection strategy for insect parasitoids

Environmental weakening of trophic interactions drives stability in stochastic food webs

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