Eating the competition speeds up invasions

Hall, Richard J.

doi:10.1098/rsbl.2010.0766

Cited by 13 publications

(11 citation statements)

References 18 publications

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“…). The importance of intraguild predation in invasions and biological control has become increasingly apparent (Hall ; Hatcher & Dunn ) and promises to be an area of fruitful research.…”

Section: Indirect Effects Of Parasites In Consumer–resource Interactionsmentioning

confidence: 99%

“…Parasitized G. pulex show reduced intraguild predation of the native G. duebeni celticus, which may slow the displacement of the native species (MacNeil et al 2003b). The importance of intraguild predation in invasions and biological control has become increasingly apparent (Hall 2011;Hatcher & Dunn 2011) and promises to be an area of fruitful research.…”

Section: P a R A S I T E S O F T H E R E S O U R C E A N D C O N S U mentioning

confidence: 99%

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Indirect effects of parasites in invasions

et al. 2012

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Summary1. Introduced species disrupt native communities and biodiversity worldwide. Parasitic infections (and at times, their absence) are thought to be a key component in the success and impact of biological invasions by plants and animals. They can facilitate or limit invasions, and positively or negatively impact native species. 2. Parasites have not only direct effects on their hosts, but also indirect effects on the species with which their hosts interact. Indirect effects include density-mediated effects (resulting from parasite-induced reduction in host reproduction and survival) as well as trait-mediated indirect effects (resulting from parasite-induced changes in host phenotype, behaviour or life history). These effects are not mutually exclusive but often interact. 3. The importance of these indirect interactions for invasion success, and the extent to which these effects ramify throughout communities and influence ecosystems undergoing biological invasion provide the focus of our review. Examples from the animal and plant literature illustrate the importance of parasites in mediating both competitive and consumer-resource interactions between native and invasive species. 4. Parasites are involved in indirect interactions at all trophic levels. Furthermore, the indirect effects of parasitic infection are important at a range of biological scales from within a host to the whole ecosystem in determining invasion success and impact. 5. To understand the importance of parasitic infection in invasion success and in the outcomes for invaded communities requires an interdisciplinary approach by ecologists and parasitologists, across animal and plant systems. Future research should develop a framework integrating community ecology, evolution and immunology to better understand and manage the spread of invasive species and their diseases.

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“…). The importance of intraguild predation in invasions and biological control has become increasingly apparent (Hall ; Hatcher & Dunn ) and promises to be an area of fruitful research.…”

Section: Indirect Effects Of Parasites In Consumer–resource Interactionsmentioning

confidence: 99%

Section: P a R A S I T E S O F T H E R E S O U R C E A N D C O N S U mentioning

confidence: 99%

Indirect effects of parasites in invasions

et al. 2012

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“…Initially, the introduction of an omnivore with its simultaneous predation and competition would appear to be devastating to recipient communities, particularly consumers. While there are many documented introductions with deleterious effects, as in native food webs, stabilizing mechanisms could reduce interaction strengths in food webs with introduced omnivores (Dick & Platvoet, ; Hall, ,b; Lodge et al., ). Further, our study suggests that these coexistence mechanisms need not necessarily evolve if the traits that form these stabilizing mechanisms are pre‐existing and that these stabilizing mechanisms may reduce the impact of the introduced omnivores facilitating for the persistence food webs, generally.…”

Section: Discussionmentioning

confidence: 99%

Stabilizing mechanisms in a food web with an introduced omnivore

Granados

Duffy

McKindsey

et al. 2017

Ecology and Evolution

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Intraguild predation (IGP) is an omnivorous food web configuration in which the top predator consumes both a competitor (consumer) and a second prey that it shares with the competitor. This omnivorous configuration occurs frequently in food webs, but theory suggests that it is unstable unless stabilizing mechanisms exist that can decrease the strength of the omnivore and consumer interaction. Although these mechanisms have been documented in native food webs, little is known about whether they operate in the context of an introduced species. Here, we study a marine mussel aquaculture system where the introduction of omnivorous mussels should generate an unstable food web that favors the extinction of the consumer, yet it persists. Using field and laboratory approaches, we searched for stabilizing mechanisms that could reduce interaction strengths in the food web. While field zooplankton counts suggested that mussels influence the composition and abundance of copepods, stable isotope results indicated that life‐history omnivory and cannibalism facilitated the availability of prey refugia, and reduced competition and the interaction strength between the mussel omnivore and zooplankton consumers. In laboratory experiments, however, we found no evidence of adaptive feeding which could weaken predator–consumer interactions. Our food web study suggests that the impact of an introduced omnivore may not only depend on its interaction with native species but also on the availability of stabilizing mechanisms that alter the strength of those interactions.

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“…Similar systems are common in native intertidal communities where generalist crabs and seastars feed on both predatory snails and bivalve prey of snails (e.g., [20], [21]). Additionally, models predict unintuitive dynamics caused by IGP in systems where the intraguild predator is a non-native species [22], and demonstrate that IGP by non-natives can accelerate the speed of invasion [23]. Less is known about IGP in systems where the intraguild prey is a non-native.…”

Section: Introductionmentioning

confidence: 99%

Preference Alters Consumptive Effects of Predators: Top-Down Effects of a Native Crab on a System of Native and Introduced Prey

Grason

Miner

2012

PLoS ONE

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Top-down effects of predators in systems depend on the rate at which predators consume prey, and on predator preferences among available prey. In invaded communities, these parameters might be difficult to predict because ecological relationships are typically evolutionarily novel. We examined feeding rates and preferences of a crab native to the Pacific Northwest, Cancer productus, among four prey items: two invasive species of oyster drill (the marine whelks Urosalpinx cinerea and Ocenebra inornata) and two species of oyster (Crassostrea gigas and Ostrea lurida) that are also consumed by U. cinerea and O. inornata. This system is also characterized by intraguild predation because crabs are predators of drills and compete with them for prey (oysters). When only the oysters were offered, crabs did not express a preference and consumed approximately 9 juvenile oysters crab−1 day−1. We then tested whether crabs preferred adult drills of either U. cinerea or O. inornata, or juvenile oysters (C. gigas). While crabs consumed drills and oysters at approximately the same rate when only one type of prey was offered, they expressed a strong preference for juvenile oysters over drills when they were allowed to choose among the three prey items. This preference for oysters might negate the positive indirect effects that crabs have on oysters by crabs consuming drills (trophic cascade) because crabs have a large negative direct effect on oysters when crabs, oysters, and drills co-occur.

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Eating the competition speeds up invasions

Cited by 13 publications

References 18 publications

Indirect effects of parasites in invasions

Indirect effects of parasites in invasions

Stabilizing mechanisms in a food web with an introduced omnivore

Preference Alters Consumptive Effects of Predators: Top-Down Effects of a Native Crab on a System of Native and Introduced Prey

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