COMING SOON! PQDT Open is getting a new home!

ProQuest Open Access Dissertations & Theses will remain freely available as part of a new and enhanced search experience at

Questions? Please refer to this FAQ.

Dissertation/Thesis Abstract

An investigation of the early life-history of brown trout (Salmo trutta) and potential influences on invasion success in the Logan River, Utah
by Wood, Jeremiah R., M.S., Utah State University, 2008, 57; 1453780
Abstract (Summary)

Due to the significant threats posed by nonnative fish species worldwide, it is important to understand how life-history strategies of individual species interact with environmental conditions to explain the success or failure of nonnative fish invasions. Brown trout are prolific invaders, but often exhibit upstream distributional limits in Intermountain West streams, potentially due to a maladaptive reproductive life-history strategy influenced by hydrologic conditions in high-elevation areas. We used redd counts, egg survival experiments, and temperature modeling to investigate the reproductive life-history strategy of brown trout and its potential for success along an elevational stream gradient. We documented brown trout spawning in stream reaches at elevations higher than where we typically encounter brown trout during summer electrofishing surveys, indicating the potential for upstream invasion. We observed a decline in egg survival at higher elevation, cooler water sites, but did not document complete recruitment failure at these sites, again indicating the potential for successful invasion at this life-stage. Temperature data indicate that during most years, incubating brown trout eggs would likely fail to emerge from the gravel prior to peak spring flows in these high-elevation stream reaches, suggesting that damaging spring floods may cause significant egg and sac-fry mortality at high elevations, and may determine invasion success in these areas. Our results highlight the importance of identifying specific mechanisms of recruitment failure in order to better predict nonnative fish invasions in the future.

Indexing (document details)
Advisor: Budy, Phaedra
Commitee: Roper, Brett, Tarboton, Dave
School: Utah State University
Department: Watershed Sciences (WATS)
School Location: United States -- Utah
Source: MAI 46/06M, Masters Abstracts International
Subjects: Ecology, Aquatic sciences, Physiology
Keywords: Brown trout, Early life-history, Exotic species, Invasion, Salmo trutta, Spawning ecology
Publication Number: 1453780
ISBN: 978-0-549-57662-4
Copyright © 2021 ProQuest LLC. All rights reserved. Terms and Conditions Privacy Policy Cookie Policy