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Influence of landscape on resident and anadromous life history types of Oncorhynchus mykiss

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Landscape features can significantly influence genetic and life history diversity 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.

Les caractéristiques du paysage peuvent influencer significativement la diversité de la génétique et du cycle biologique de truites arc-en-ciel, Oncorhynchus mykiss, anadromes et non anadromes. Dans notre étude, l’hétérozygotie chez 21 populations d’O. mykiss de la région pacifique du nord-ouest, É.-U., est en forte corrélation négative avec des caractéristiques telles que l’altitude (P = 0,0023), la distance vers l’amont (P = 0,0129) et les précipitations (P = 0,0331) et en corrélation positive avec la température (P = 0,0123). Les tests d’isolement par la distance de Mantel sont significatifs pour les populations anadromes (P = 0,007), mais non pour les échantillons de résidants (P = 0,061), ce qui indique que la distance fluviale n’est pas la seule variable physique significative qui influence la structure génétique des types de cycles biologiques. Une interpolation des composantes principales dans le bassin versant montre que les sites de haute altitude sont surtout occupés par des truites à cycle biologique de type résidant et que les pentes abruptes et les barrières ont pour effet de restreindre la répartition des truites anadromes aux sites de plus basse altitude. Ces patrons de diversité des cycles biologiques chez O. mykiss ouvrent des perspectives sur les interactions, la répartition et les limites chez les formes résidante et anadrome de l’espèce dans la région.

Document Type: Research Article

Publication date: 2008-06-01

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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