Chapter three - Variation in the diet of juvenile salmonids across a gradient of stream development in Glacier Bay, Alaska

Clitherow, Leonie R., Sønderland, Svein H., Windsor, Fredric M. ORCID: https://orcid.org/0000-0001-5030-3470 and Milner, Alexander M. 2024. Chapter three - Variation in the diet of juvenile salmonids across a gradient of stream development in Glacier Bay, Alaska. Dumbrell, Alex J. and AMilner, Alexander M., eds. Advances in Ecological Research, Vol. 71. Elsevier, pp. 85-112. (10.1016/bs.aecr.2024.10.005)

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Abstract

Links between streams and their riparian zones, also known as reciprocal subsidies, have been well studied in many stream systems, but this research has typically been conducted over short timescales (e.g., annually). Understanding how these linkages change over longer time scales, for example multi-decadal to centennial, is a significant gap in our knowledge base, but critically important as it is over these timescales that landscape and successional processes operate. Glacier Bay, southeast Alaska, is a well-documented example of glacial retreat, which allows for studying the interactions between terrestrial and aquatic communities along a spacefor-time substitution approach, using post-glacial streams in differently aged watersheds (36 to 203 years since ice receded from the mouth of the stream). Gut contents and stable isotope analyses for juvenile salmonids were completed for six stream ecosystems. The balance of terrestrial and aquatic dietary contributions for juvenile salmonids varied across the streams and was influenced by physical habitat complexity in mid-aged streams and reflected the geomorphology and vegetational properties. Juvenile salmonids, particularly coho salmon, in streams with higher channel sinuosity consumed a higher proportion of terrestrial prey. Salmonids also showed preference and avoidance or certain aquatic prey items, indicating that feeding was not always density-dependent. These patterns in diet were influenced by physical habitat complexity in mid-aged streams and reflected the geomorphology and vegetational properties as well as periodic disturbances in the watersheds. Moving forward it is important to account for these natural development processes in river management, especially when thinking about restoration of stream ecosystems.

Item Type:	Book Section
Date Type:	Publication
Status:	Published
Schools:	Biosciences
Subjects:	Q Science > QL Zoology
Publisher:	Elsevier
ISSN:	0065-2504
Date of First Compliant Deposit:	27 November 2024
Date of Acceptance:	24 October 2024
Last Modified:	27 Nov 2024 13:00
URI:	https://orca.cardiff.ac.uk/id/eprint/173855

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