Interactions between Native and Nonnative Fishes of the Upper Muddy River, Nevada
- 1 July 1993
- journal article
- Published by Oxford University Press (OUP) in Transactions of the American Fisheries Society
- Vol. 122 (4) , 599-608
- https://doi.org/10.1577/1548-8659(1993)122<0599:ibnanf>2.3.co;2
Abstract
I investigated interactions between native and nonnative fishes in the upper Muddy River system to add insight into (1) the mechanism causing the decline of the Moapa dace Moapa coriacea after the introduction of the shortfin molly Poecilia mexicana, (2) the reason Moapa White River springfish Crenichthys bailevi moapae were less affected by the introduction, and (3) the reason interactions between natives is relatively benign. I investigated the hypothesis that the shortfin molly caused the decline of the Moapa dace through competition or predation on larvae, pressures not experienced by the Moapa White River springfish. Relative interspecific competition was analyzed by contrasting the ranges of spatial and dietary overlap among larval, juvenile, and adult life stages. There appeared to be moderate to low spatial overlap between the various life stages of native and nonnative fishes. Overlap in diet was highest between adult Moapa White River springfish and shortfin mollies. Laboratory experime...Keywords
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