Evidence of indirect impacts of introduced trout on native amphibians via facilitation of a shared predator

Pope, Karen L.; Garwood, Justin M.; Welsh, Hartwell H.; Lawler, Sharon P.

doi:10.1016/j.biocon.2008.03.008

Cited by 38 publications

(23 citation statements)

References 40 publications

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“…Diffuse facilitation has also been reported in analogous situations to that reported here, e.g. brown tree snakes in Guam which survive by feeding at low levels on lizards but have decimated bird populations (Fritts & Rodda 1998), and garter snakes in California supported by feeding on introduced trout but also preying on and reducing the abundance of amphibians (Pope et al 2008). These 2 cases and that of A. sinensis are instances of hyperpredation (Smith & Quin 1996), by which an abundant prey supports the predator population, which then also preys on the less abundant alternative prey, resulting in population declines.…”

Section: Discussionmentioning

confidence: 71%

Abiotic and biotic controls on the copepod Pseudodiaptomus forbesi in the upper San Francisco Estuary

Kayfetz¹,

Kimmerer²

2017

Mar. Ecol. Prog. Ser.

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Salinity is a key control on species distribution in estuaries, but interspecific interactions can shift distributions of estuarine species away from physiologically optimal salinities. The distribution of the introduced calanoid copepod Pseudodiaptomus forbesi in the upper San Francisco Estuary (SFE) shifted from brackish to fresh water in 1993 following the introductions of 2 brackish-water copepods, the small but numerically dominant Limnoithona tetraspina (Cyclopoida) and the predatory Acartiella sinensis (Calanoida). The nearly simultaneous timing of these introductions complicated interpretation of the temporal change in distribution of P. forbesi. Although P. forbesi is now uncommon at salinity >~2, which might be interpreted as the result of salinity stress, short-term experiments showed high survival of adults up to salinity ~8 and of nauplii to salinity of at least 14, and reproduction was highest at salinity 5. Feeding experiments showed some overlap in diets of P. forbesi and L. tetraspina, but P. forbesi consumed a broader range of prey than L. tetraspina. Furthermore, feeding rates of the L. tetraspina population appeared insufficient to reduce prey availability to P. forbesi. Previous reports of high consumption of nauplii by A. sinensis and the clam Potamocorbula amurensis suggest that these interspecific interactions are important in constraining the distribution of P. forbesi in the upper SFE. Thus, we interpret the temporal shift in distribution of P. forbesi as due mainly to the introduction of the predatory copepod, whose high abundance may have been facilitated by the availability of a common alternative prey, L. tetraspina.

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Section: Discussionmentioning

confidence: 71%

Abiotic and biotic controls on the copepod Pseudodiaptomus forbesi in the upper San Francisco Estuary

Kayfetz¹,

Kimmerer²

2017

Mar. Ecol. Prog. Ser.

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“…This has been observed in lakes of the Klamath Mountains, California, where introduced trout have reduced populations of a native frog both through their own predation and by facilitating predation by an introduced aquatic snake ( Pope et al 2008 ).…”

Section: Cascading Impacts On Food Websmentioning

confidence: 99%

Impacts of Biological Invasions on Freshwater Ecosystems

Ricciardi

MacIsaac

2010

Fifty Years of Invasion Ecology

103

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“…Thus, intra-guild interactions in a predator community may emerge and this may have profound effects on both predators and native prey communities (Snyder and Evans 2006;Hogg and Daane 2011). Invasive predators may displace native predators either directly, via intra-guild predation, or indirectly, through scramble competition (Pope et al 2008;Cupples et al 2011;Hogg and Daane 2011). Therefore, the negative impact of invasive predatory species may spread beyond the native predators to indirectly affect native prey as well (Gregory and Quijón 2011;Hogg and Daane 2011).…”

Section: Introductionmentioning

confidence: 99%

An invasive gull displaces native waterbirds to breeding habitats more exposed to native predators

et al. 2014

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The effect of invasive opportunistic predators may include population changes in both native prey and native predators as well as alteration of predator-prey interactions. We analyzed the activity of native magpie Pica pica and changes in population, nest sites and nesting success probability of native waterbirds (namely: grebes, ducks, rails and native gulls) in response to the population growth of the invasive Caspian gull Larus cachinnans. The study was carried out at a reservoir in southern Poland and at a similar control reservoir where the Caspian gull was absent. Both the invasive gulls and the native magpie are opportunistic predators of nests of native waterbirds. The population increase of the invasive gull led to a decline in the population of native black-headed gulls Larus ridibundus only. However, the invasive gull displaced all the native species from the breeding islets located in the central part of the reservoir to islets located close to the shoreline. The latter were frequently visited by magpies, which depredated on nests along the shores, leading to an up to threefold decrease in nesting success as compared with nests located in the central area of the invaded reservoir. Predation by Caspian gulls was rarely observed. Thus, the invasion of Caspian gull caused complex direct and indirect effects on the waterbird community that included competition for breeding sites, changes in the spatial distribution of nests and alteration of predation rate by native predators. Moreover, the effects of invasion may not be reflected by changes in population size of native species.

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Evidence of indirect impacts of introduced trout on native amphibians via facilitation of a shared predator

Cited by 38 publications

References 40 publications

Abiotic and biotic controls on the copepod Pseudodiaptomus forbesi in the upper San Francisco Estuary

Abiotic and biotic controls on the copepod Pseudodiaptomus forbesi in the upper San Francisco Estuary

Impacts of Biological Invasions on Freshwater Ecosystems

An invasive gull displaces native waterbirds to breeding habitats more exposed to native predators

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