The role of gape‐limitation in intraguild predation between endangered <scp>M</scp>ohave tui chub and non‐native western mosquitofish

Henkanaththegedara, Sujan M.; Stockwell, Craig A.

doi:10.1111/j.1600-0633.2012.00587.x

Cited by 10 publications

(10 citation statements)

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“…Relatively low male survival is also consistent with the gape‐size limitation hypothesis as male mosquitofish are much smaller than females. Elsewhere, we have reported the results of laboratory predation trials and vulnerability modelling that also showed evidence for gape‐size limitation in this study system (Henkanaththegedara & Stockwell ). Additionally, in a more food‐limited natural environment, the effects of predation might be even more pronounced as both species would have more motivation to be piscivorous.…”

Section: Discussionmentioning

confidence: 63%

“…Reduced tui chub larval production was presumably due to mosquitofish predation on tui chub eggs and larvae, rather than competition, because food was provided. Further, it is noteworthy that mosquitofish preyed on tui chub larvae during laboratory trials (Henkanaththegedara & Stockwell ). Other studies have reported mosquitofish predation as the primary mechanism of mosquitofish impact on native fishes (Belk & Lydeard ; Mills, Rader & Belk ; Rogowski & Stockwell ).…”

Section: Discussionmentioning

confidence: 99%

“…In addition to IGP, mechanisms such as habitat complexity and niche partitioning may explain the long‐term co‐persistence of mosquitofish and Mohave tui chub (Henkanaththegedara & Stockwell ). Although we provided cover in our experimental mesocosms, it is likely that habitat complexity in the wild is more complex and predation risk may be lower than observed in our experiment.…”

Section: Discussionmentioning

confidence: 99%

“…Briefly, the relative vulnerability of prey ( V ) to predation is modelled as a function of prey body depth ( d ) and the relative frequency ( W ) of predators' gape size ( w ) in the predator population (Hambright et al . ; Henkanaththegedara & Stockwell ).

V_{d} = 1 - \sum_{w = 0}^{d} W

…”

Section: Methodsmentioning

confidence: 99%

“…We excluded male mosquitofish from this modelling exercise due to insufficient sample size. We have provided detailed methods for vulnerability modelling to assess Mohave tui chub‐western mosquitofish reciprocal predation in elsewhere (see Henkanaththegedara & Stockwell ).…”

Section: Methodsmentioning

confidence: 99%

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Intraguild predation may facilitate coexistence of native and non‐native fish

Henkanaththegedara

Stockwell

2014

Journal of Applied Ecology

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Summary1. Although largely ignored, coexistence of native species with non-native species is the rule rather than the exception in the contemporary world. Therefore, understanding the mechanisms that facilitate coexistence of native species with non-native invasive species is critical in implementing effective management strategies to conserve native biodiversity. 2. We conducted field mesocosm experiments to study reciprocal predation between an invasive fish species (Western mosquitofish Gambusia affinis) and an endangered fish species (Mohave tui chub Siphateles bicolor mohavensis). Additional predation vulnerability modelling was conducted to assess the vulnerability of a given prey population to predation by a gapesize limited predator population. 3. Adult mosquitofish reduced Mohave tui chub recruitment through predation on tui chub larvae. Reciprocally, adult tui chubs limited the population growth of mosquitofish through predation on adult mosquitofish, providing evidence for intraguild predation (IGP). Mohave tui chub predation on adult mosquitofish was apparently gape-size limited and larger female mosquitofish avoided tui chub predation. 4. Vulnerability modelling provided additional information on gape-size limited reciprocal predation between these two fish species and insights on the effects of such IGP on persistence of Mohave tui chub in the presence of invasive mosquitofish. 5. Synthesis and applications. Our results collectively show size-structured intraguild predation (IGP) between a native endangered fish and an invasive fish species, which may facilitate coexistence of these species. Invasive species often prey on native species, thus IGP may be a common but neglected phenomenon for invaded systems. Therefore, understanding the complex interactions among native and non-native species in the whole-ecosystem context may help conservation practitioners identify novel management strategies. This may be especially necessary when natural, uninvaded habitats for native species become increasingly scarce due to alterations resulting from multiple forms of human impact.

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Section: Discussionmentioning

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

V_{d} = 1 - \sum_{w = 0}^{d} W

…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Intraguild predation may facilitate coexistence of native and non‐native fish

Henkanaththegedara

Stockwell

2014

Journal of Applied Ecology

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Unstable intraguild predation causes establishment failure of a globally invasive species

Tuckett

Deacon

Fraser

et al. 2021

Ecology

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Biotic resistance is often posited, but rarely known, to be the cause of invasion failure. Competition and predation are the most frequently identified processes that may prevent or limit the establishment of nonnative species. Interactions between nonnative and native species that involve intraguild predation (IGP) are very common in nature, although theory predicts most IGP systems should be unstable and lead to extinction. If this prediction is true, the frequency of invasion failures due to IGP may be underappreciated because of their fleeting nature and, thus, studies of unstable IGP systems are lacking, despite the opportunities they offer for understanding the factors affecting their unstable dynamics. We investigated a failed invasion involving an IGP relationship. In Florida, the guppy (Poecilia reticulata), a worldwide invader, fails to establish in the presence of eastern mosquitofish (Gambusia holbrooki). We tested whether and how resident mosquitofish cause guppy invasion failure using replicated mesocosm and aquarium trials. Both the predator and competitor components of the IGP relationship were strongly asymmetrical, with large impacts on guppies. We identified two effects, direct consumption of neonates and aggressive interference competition, that limited survival and recruitment. The highly unstable nature of this IGP relationship is the primary cause of the failure of the guppy to establish in Florida. Our study shows that the transient nature of an ephemeral IGP relationship can yield important insights into the underlying causes of invasion failure, including the role of strong biotic resistance.

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A comparison of the ecological effects of two invasive poeciliids and two native fishes: a mesocosm approach

Tsang

Dudgeon

2021

Biol Invasions

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The role of gape‐limitation in intraguild predation between endangered Mohave tui chub and non‐native western mosquitofish

Cited by 10 publications

References 48 publications

Intraguild predation may facilitate coexistence of native and non‐native fish

Intraguild predation may facilitate coexistence of native and non‐native fish

Unstable intraguild predation causes establishment failure of a globally invasive species

A comparison of the ecological effects of two invasive poeciliids and two native fishes: a mesocosm approach

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