Intrinsic and environmental drivers of growth in an Alaskan rockfish: an otolith biochronology approach

Mary Elizabeth Matta, Thomas E. Helser, Bryan A. Black

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Otolith growth-increment chronologies provide an approach for evaluating the impacts of both high-frequency (e.g., interannual) and low-frequency (e.g., interdecadal) climate variability on fish growth. A growth-increment biochronology spanning six decades, spanning several warm and cold climate regime periods, was developed for a commercially important species of rockfish, Sebastes polyspinis, in the Gulf of Alaska. To confirm that all increments were correctly identified and placed in time, we borrowed the technique of crossdating from the tree-ring science of dendrochronology, which ensured high data quality. We then used a mixed effects model to partition variance in otolith growth-increment width among intrinsic (e.g., age-related) and extrinsic (e.g., climate-related) factors. This biochronology was contrasted with one recently developed for S. alutus, a closely-related species which exhibited a significant change in growth following the late 1970s North Pacific climate regime shift. Both species generally showed positive relationships between warm climate conditions and growth, though S. polyspinis experienced a relatively smaller step-increase in growth following the regime shift. The new S. polyspinis otolith biochronology represents a long-term record of growth that extends well before biological specimens were first collected in the Gulf of Alaska, providing a potential tool for fisheries managers to evaluate the effects of climate variability on growth and biological reference points.

Original languageEnglish (US)
Pages (from-to)1571-1587
Number of pages17
JournalEnvironmental Biology of Fishes
Volume101
Issue number11
DOIs
StatePublished - Nov 1 2018
Externally publishedYes

Keywords

  • Age and growth
  • Climate change
  • North Pacific
  • Otoliths
  • Regime shift
  • Sclerochronology

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science

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