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1 January 2004 Population-level responses to sediment during early life inbrook trout
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Abstract

The spawning sites, incubation success, and density of young-of-the-year (YOY) brook trout (Salvelinus fontinalis) were examined in stream populations experiencing varying levels of sediment stress. Our objective was to determine effects on embryos and YOY and examine cumulative effects on the populations. Early development was unaffected (88% survival). Mortality occurred at late, encapsulated embryo stages likely as a function of oxygen deprivation within redds. Survival to emergence from the substrate was significantly reduced (∼50%) in redds in which fine sediments accumulated. Groundwater reduced sediment accumulation in redds and enhanced survival. Sediment may have affected dispersal of YOY trout. All populations appeared successful in term of total density (average = 72/100 m2). Our findings emphasize the importance of targeting multiple life-history stages and understanding local adaptations when searching for true population-level effects in any stressed ecosystem.

R. Allen Curry and W. Scott MacNeill "Population-level responses to sediment during early life inbrook trout," Journal of the North American Benthological Society 23(1), 140-150, (1 January 2004). https://doi.org/10.1899/0887-3593(2004)023<0140:PRTSDE>2.0.CO;2
Received: 18 March 2003; Accepted: 19 November 2003; Published: 1 January 2004
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