Phosphorus flux due to Atlantic salmon (<i>Salmo salar</i>) in an oligotrophic upland stream: effects of management and demography

TitlePhosphorus flux due to Atlantic salmon (Salmo salar) in an oligotrophic upland stream: effects of management and demography
Publication TypeJournal Article
Year of Publication2004
AuthorsNislow, Keith H., Armstrong John D., and McKelvey Simon
JournalCanadian Journal of Fisheries and Aquatic Sciences
Volume61
Pagination2401 - 2410
Date Published2004
Keywordsclimate science center
Abstract

Little is known concerning the role of Atlantic salmon (Salmo salar) in the transport of nutrients to and from river systems. We used demographic data from the River Bran, an oligotrophic river in Scotland, UK, to construct a budget for the transport of phosphorus (P) and applied it to investigate the effects of management strategies and demographic rates on potential transport. At present, because few adults return to their spawning grounds, salmon export 0.2–0.5 kg P•year–1. In contrast, increasing passage rates to a level sufficient to maintain a population without stocking would likely result in a gain of up to several kilograms per year. However, this effect depended on the retention of adult-derived P, which varies across systems and is poorly known at present. Egg-derived P exceeded that from adults at low (