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Influence of the Landscape Template on Chemical and Physical Habitat for Brown Trout Within a Boreal Stream Network

Buffam, Ishi and Bishop, Kevin and Laudon, Hjalmar (2021). Influence of the Landscape Template on Chemical and Physical Habitat for Brown Trout Within a Boreal Stream Network. Frontiers in Water. 3 , 683070
[Research article]

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We used the distribution of stream-dwelling brown trout (Salmo trutta) in a 67 km(2) boreal catchment to explore the importance of environmental organizing factors at a range of spatial scales, including whole-catchment characteristics derived from map data, and stream reach chemical and physical characteristics. Brown trout were not observed at any sites characterized by pH < 5.0 during the spring snowmelt episode, matching published toxicity thresholds. Brown trout distributions were patchy even in less acidic regions of the stream network, positively associated with glaciofluvial substrate and negatively associated with fine sand/silty sediments. A multivariate model including only whole-catchment characteristics explained 43% of the variation in brown trout densities, while models with local site physical habitat characteristics or local stream chemistry explained 33 and 25%, respectively. At the stream reach scale, physical habitat apparently played a primary role in organizing brown trout distributions in this stream network, with acidity placing an additional restriction by excluding brown trout from acidic headwater streams. Much of the strength of the catchment characteristics-fish association could be explained by the correlation of catchment-scale landscape characteristics with local stream chemistry and site physical characteristics. These results, consistent with the concept of multiple hierarchical environmental filters regulating the distribution of this fish species, underline the importance of considering a range of spatial scales and both physical and chemical environments when attempting to manage or restore streams for brown trout.

Authors/Creators:Buffam, Ishi and Bishop, Kevin and Laudon, Hjalmar
Title:Influence of the Landscape Template on Chemical and Physical Habitat for Brown Trout Within a Boreal Stream Network
Series Name/Journal:Frontiers in Water
Year of publishing :2021
Article number:683070
Number of Pages:17
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:pH, Salmo trutta, salmonid distributions, catchment-scale, Sweden
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Additional ID:
Type of IDID
Web of Science (WoS)000698620900001
ID Code:28513
Faculty:S - Faculty of Forest Sciences
NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(S) > Dept. of Forest Ecology and Management
(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:22 Aug 2022 12:30
Metadata Last Modified:22 Aug 2022 12:31

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