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Influence of landscape on
resident and anadromous life history types of Oncorhynchus mykiss
Abstract |
| Landscape
features can significantly influence genetic and life history diverstiy
of rainbow/steelhead trout, Oncorhynchus mykiss. In this
study, heterozygosity of 21 populations of O. mykiss from
the Pacific Northwest, USA, was significantly negatively correlated
with features such as elevation (P=0.0023), upstream distance
(P=0.0129), and precipitation (P=0.0331), and positively
correlated with temperature (P=0.0123). Mantel tests of isolation
by distance were significant for anadromous populations (P=0.007)
but not for resident collections (P=0.061), and suggested
that fluvial distance was not the only significant physical variable
that influenced genetic structure of life history types. Principal
components interpolated to the drainage indicated that high-elevation
sites were primarily occupied by the resident form, and high gradients
and barriers act to limit anadromous distribution to lower elevation
sites. These patterns of O. mykiss life history diversity
provide insight regarding the interaction, distribution, and limitations
of resident and anadromous forms of the species within this region. |
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