Response of endangered Poeciliopsis occidentalis sonoriensis in the R�o Yaqui drainage, Arizona, to introduced Gambusia affinis

Galat, David L.; Robertson, Ben P.

doi:10.1007/bf00005869

Cited by 27 publications

(33 citation statements)

References 18 publications

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“…Field observations by Galat and Robertson (1992) of Sonoran topminnows and mosquitofish showed that sympatric topminnow populations had higher growth and fecundity than allopatric populations. They suggested that size-selective predation by mosquitofish removed smaller topminnows, resulting in larger average size of remaining topminnows where they coexisted with mosquitofish.…”

Section: Discussionmentioning

confidence: 98%

Ex situ evaluation of impacts of invasive mosquitofish on the imperiled Barrens topminnow

Laha

Mattingly

2006

Environ Biol Fish

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Section: Discussionmentioning

confidence: 98%

Ex situ evaluation of impacts of invasive mosquitofish on the imperiled Barrens topminnow

Laha

Mattingly

2006

Environ Biol Fish

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“…Although they are native to the southeastern United States, their range has been expanded throughout North America for mosquito control. Increases in mosquitofish have been correlated with a decline in native species, but the mechanisms are rarely known (e.g., Galat and Robertson 1992;Rincon et al 2002). However, mosquitofish are aggressive predators that feed on a variety of aquatic organisms, including their own young and the young of other fish (Meffe 1985;Sigler and Sigler 1987;Sigler and Miller 1996;Barrier and Hicks 1994;Gamradt and Kats 1996;Goodsell and Kats 1999;Komak and Crossland 2000).…”

Section: Historical Backgroundmentioning

confidence: 98%

Complex interactions between native and invasive fish: the simultaneous effects of multiple negative interactions

2004

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We suggest that the ultimate outcome of interactions between native species and invasive species (extinction or coexistence) depends on the number of simultaneous negative interactions (competition and predation), which depends on relative body sizes of the species. Multiple simultaneous interactions may constrain the ability of native species to trade fitness components (i.e., reduced growth for reduced risk of predation) causing a spiral to extinction. We found evidence for five types of interactions between the adults and juveniles of introduced western mosquitofish (Gambusia affinis) and the juveniles of native least chub (Iotichthys phlegethontis). We added ten large (23-28 mm) and seven small (9-13 mm) young-of-the-year (YOY) least chub to replicate enclosures with zero, low, and high densities of mosquitofish in a desert spring ecosystem. Treatments with mosquitofish reduced the average survival of least chub by one-third. No small YOY least chub survived in enclosures with high mosquitofish densities. We also performed two laboratory experiments to determine mortality to predation, aggressiveness, and habitat selection of least chub in the presence of mosquitofish. Mean mortality of least chub due to predation by large mosquitofish was 69.7% over a 3-h trial. Least chub were less aggressive, selected protected habitats (Potamogeton spp.), and were more stationary in the presence of mosquitofish where the dominance hierarchy was large mosquitofish>>large least chub approximately small mosquitofish>>small least chub. Least chub juveniles appear to be figuratively caught in a vice. Rapid growth to a size refuge could reduce the risk of predation, but the simultaneous effects of competition decreased least chub growth and prolonged the period when juveniles were vulnerable to mosquitofish predation.

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“…and crayfish (Orconectes virilis), both of which have been widely introduced throughout the western United States (Fuller et al 1999). Earlier workers have shown that the mosquitofish may impact certain desert fish species (Schoenherr 1981;Meffe 1985;Galat and Robertson 1992). Introduced crayfish species in general negatively impact native species (Gamradt and Kats 1996;Lodge et al 2000).…”

Section: Introductionmentioning

confidence: 97%

Assessment of Potential Impacts of Exotic Species on Populations of a Threatened Species, White Sands Pupfish, Cyprinodon tularosa

Rogowski

Stockwell

2006

Biol Invasions

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The potential impact of introduced species on rare taxa is of particular concern to conservation biologists. We evaluate the impacts of western mosquitofish (Gambusia affinis) and virile crayfish (Orconectes virilis) on experimental populations of a threatened species, the White Sands pupfish (Cyprinodon tularosa). Forty experimental pupfish populations were exposed to one of four treatments; (a) 1 crayfish, (b) 4 crayfish, (c) 5 adult mosquitofish and (d) control. Pupfish population size and biomass was monitored over the duration of one breeding season. A repeated measure multiple analysis of covariance revealed a significant effect of treatments on response variables (population size and biomass) (P<0.0001). Mosquitofish had a significant effect on population size and biomass (P=0.0330). The effect of one crayfish was not significant (P=0. 0683). However, 4 crayfish had a significant effect (P<0.0001) on population size. We use these data, along with information on environmental tolerances of crayfish and mosquitofish, to evaluate risks for specific pupfish populations.

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Response of endangered Poeciliopsis occidentalis sonoriensis in the R�o Yaqui drainage, Arizona, to introduced Gambusia affinis

Cited by 27 publications

References 18 publications

Ex situ evaluation of impacts of invasive mosquitofish on the imperiled Barrens topminnow

Ex situ evaluation of impacts of invasive mosquitofish on the imperiled Barrens topminnow

Complex interactions between native and invasive fish: the simultaneous effects of multiple negative interactions

Assessment of Potential Impacts of Exotic Species on Populations of a Threatened Species, White Sands Pupfish, Cyprinodon tularosa

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