North Pacific Anadromous Fish Commission

Technical Report 11

Table of Contents

Unravelling how Climate and Competition Shape Sockeye Salmon Dynamics Across the Northeast Pacific Ocean

Authors:
Brendan Connors, Michael Malick, Gregory T. Ruggerone, Pete Rand, Milo Adkison, James R. Irvine, Rob Campbell, and Kristen Gorman

Abstract Excerpt:
It is well known that both ocean conditions and inter- and intra-specific interactions can influence salmon growth and survival. However, to date, there has been little analysis of the potential mediating effects of ocean conditions on density-dependent interactions among salmon at sea. Such mediating effects may occur, for example, as a result of climate-induced reductions in growth during early marine life leading to increased sensitivity to density-dependent effects later in marine life. Alternatively, favorable ocean conditions during early marine life
may mask the detection of density-dependent interactions or mediate their potential effects. Life-history diversity (e.g., variable age at ocean entry), may also influence the effects of ocean conditions and competition at sea on sockeye survival by spreading the consequences of negative climate or competitive interactions across multiple life histories within a given brood year. However, how and when life-history diversity mediates the influence of the conditions salmon experience at sea has also received little attention to date.

*This is the first paragraph of an extended abstract. Download the full abstract below.

DOI:
https://doi.org/10.23849/npafctr11/72

Citation

Connors, B., M. Malick, G.T. Ruggerone, P. Rand, M. Adkison, J.R. Irvine, R. Campbell, and K. Gorman.  2018.  Unravelling how climate and competition shape sockeye salmon dynamics across the northeast Pacific Ocean.  N. Pac. Anadr. Fish Comm. Tech. Rep. 11: 72.  https://doi.org/10.23849/npafctr11/72