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Titolo:
Local and landscape effects of introduced trout on amphibians in historically fishless watersheds
Autore:
Pilliod, DS; Peterson, CR;
Indirizzi:
Idaho State Univ, Dept Biol Sci, Pocatello, ID 83209 USA Idaho State UnivPocatello ID USA 83209 Biol Sci, Pocatello, ID 83209 USA
Titolo Testata:
ECOSYSTEMS
fascicolo: 4, volume: 4, anno: 2001,
pagine: 322 - 333
SICI:
1432-9840(200106)4:4<322:LALEOI>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
CANYON-NATIONAL-PARKS; LONG-TOED SALAMANDER; HIGH-ELEVATION LAKES; AMBYSTOMA-MACRODACTYLUM; OVIPOSITION SITE; MOUNTAIN LAKES; NONNATIVE FISH; SIERRA-NEVADA; BUFO-CALAMITA; RANA-MUSCOSA;
Keywords:
Ambystoma macrodactylum; amphibian; extinction; fish stocking; introduced trout; metapopulation; persistance; Rana luteiventris; wilderness;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
61
Recensione:
Indirizzi per estratti:
Indirizzo: Pilliod, DS Idaho State Univ, Dept Biol Sci, Pocatello, ID 83209 USA IdahoState Univ Pocatello ID USA 83209 catello, ID 83209 USA
Citazione:
D.S. Pilliod e C.R. Peterson, "Local and landscape effects of introduced trout on amphibians in historically fishless watersheds", ECOSYSTEMS, 4(4), 2001, pp. 322-333

Abstract

Introduced trout have often been implicated in the decline of high-mountain amphibian populations, but few studies have attempted to understand whether fish stocking also influences the distribution and abundance of amphibians throughout entire mountain basins, including the remaining fishless lakes. We examined this relationship using the relative abundance of long-toed salamanders (Ambystoma macrodactylum) and Columbia spotted frogs (Rana luteiventris) in fish-containing and fishless lentic sites in basins with varying levels of historic fish stocking. All lentic waters were surveyed for fish and amphibians in 11 high-elevation basins in the Frank Church-River of No Return Wilderness, Idaho, between 1994 and 1999. We found introduced trout (Oncorhynchus clarki, O. mykiss, O. m. aguabonita) in 43 of the 101 sites, representing 90% of the total surface area of lentic water bodies available. At the scale of individual water bodies, after accounting for differences in habitat characteristics between fish-containing and fishless sites, the abundance of amphibians at all life stages was significantly lower in lakes with fish. At the basin scale, densities of overwintering life stages of amphibians were lower in the fishless sites of basins where more habitatwas occupied by trout. Our results suggest that many of the remaining fishless habitats are too shallow to provide suitable breeding or overwinteringsites for these amphibians and that current trout distributions may eventually result in the extirpation of amphibian populations from entire landscapes, including sites that remain in a fishless condition.

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Documento generato il 29/03/20 alle ore 12:17:47