[Download] "Trophic Relationships of Small Nonnative Fishes in a Natural Creek and Several Agricultural Drains Flowing Into the Salton Sea, And Their Potential Effects on the Endangered Desert Pupfish (Report)" by Southwestern Naturalist # Book PDF Kindle ePub Free
eBook details
- Title: Trophic Relationships of Small Nonnative Fishes in a Natural Creek and Several Agricultural Drains Flowing Into the Salton Sea, And Their Potential Effects on the Endangered Desert Pupfish (Report)
- Author : Southwestern Naturalist
- Release Date : January 01, 2009
- Genre: Life Sciences,Books,Science & Nature,
- Pages : * pages
- Size : 256 KB
Description
Predation is one of the most important ecological threats, along with competition, disease, and hybridization, posed by deliberate or inadvertent introductions of nonnative fishes into habitats of native fish throughout the world (Moyle and Cech, 1996). Examples of predation from nonnative species causing dramatic effects in native fish faunas are widespread and include invasion of the upper Great Lakes by sea lamprey (Petromyzon marinas) that virtually wiped out populations of large fishes in 20 years (Coble et al., 1990; Schneider et al., 1996), peacock bass (Cichla ocellaris) and largemouth bass (Micropterus salmoides) introduced into Central America, eliminating most species of fish from large lakes (Zaret and Paine, 1973), and Nile perch (Lates niloticus) introduced into Lake Victoria in eastern Africa, leading to extinction of nearly 200 native species (e.g., Witte et al., 1992; Ogutu-Ohwayo, 1993). In the American Southwest, predation by rainbow trout (Oncorhynchus mykiss) may be responsible for decimating the Little Colorado spinedace (Leriidomeda vittata) in the Little Colorado River system (Blinn et al., 1993), whereas predation by western mosquitofish (Gambusia affinis) is likely to have eliminated the Sonoran topminnow (Poeciliopsis occidentalis) from many waters in southern Arizona (Meffe et al., 1983). Although competition from nonnative fishes also is believed to adversely affect native fishes, such interactions are difficult to prove. The desert pupfish (Cyprinodon macularius) is another southwestern species whose original range in portions of Arizona, California, and northern Mexico may have been greatly curtailed by proliferation of nonnative fishes, although the exact ecological mechanisms are poorly documented. Several researchers (e.g., Schoenherr, 1981x; Steinhart, 1990; Moyle, 2002) have suggested predation on eggs, juveniles, and adults, and competition for food and space as possible ways that the hybrid Mozambique tilapia (Oreochromis mossambica by O. uroleriis), redbelly tilapia (Tilapia zillii), sailfin molly (Poecilia latipinna), and other nonnative species can adversely affect populations of desert pupfish.
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