NDLI: Sympatric relationship between redband trout and non-native brook trout in the Southeastern Oregon Great Basin

Content Provider	Springer Nature Link
Author	Miller, Stephanie A. Gunckel, Stephanie Jacobs, Steve Warren, Dana R.
Copyright Year	2013
Abstract	Brook trout (Salvelinus fontinalis) and rainbow trout (Oncorhynchus mykiss) have been widely introduced outside their respective ranges within North America causing declines and displacement of native trout. Yet, successful coexistence of native and non-native trout has received little attention. Here we evaluated the effect of introduced brook trout on the size and density of native redband trout in two invaded sub-basins in southeastern Oregon. In a multi-year study, we investigated whether habitat and fish communities differed between streams and stream reaches where redband trout were allopatric versus where redband trout were sympatric with brook trout. We hypothesized that redband trout would be less dense and have smaller total length in sympatry with brook trout than in allopatry, but that total trout density would not differ. We investigated whether differences in habitat existed between sympatric and allopatric locations that would indicate differentiation in site level habitat preferences for each trout species. We found that sympatric locations had more wood but similar fish community structure. Mean length and densities of redband trout were higher at allopatric locations. However, in most years at sympatric locations total trout density was twice that of allopatric redband trout sites. Using comparable data from an eastern United States system where brook trout are native, sympatric sites had lower densities of brook trout; however, total trout density did not differ. We conclude that invading trout negatively impact native trout densities; but in southeastern Oregon system the negative impact is minimized.
Starting Page	357
Ending Page	369
Page Count	13
File Format	PDF
ISSN	03781909
Journal	Environmental Biology of Fishes
Volume Number	97
Issue Number	4
e-ISSN	15735133
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-08-13
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Redband trout Brook trout Interactions Density Sympatry Allopatry Freshwater & Marine Ecology Zoology Animal Systematics/Taxonomy/Biogeography Environment Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Ecology, Evolution, Behavior and Systematics

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