Periodic fluctuations in recruitment success of Atlantic cod

Anna Rindorf*, Noel G. Cadigan, Daniel Howell, Margit Eero, Henrik Gislason

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Autocorrelation in recruitment success of fish is frequently reported, but the underlying mechanisms are generally only vaguely alluded to. We analysed recruitment success of cod 21 stocks in the North Atlantic to investigate possible common causes of autocorrelation in recruitment. We found autocorrelation and periodic fluctuations in recruitment success and adult growth in just above half of the stocks considered and investigated six possible underlying mechanisms. With three exceptions, the variations in recruitment success were not significantly related to temperature or growth anomalies, indicating that the variation was not caused by temperature dependent survival or growth dependent spawning products. Further, a link between recruitment and subsequent spawning biomass could not explain the observed recruitment patterns. Slow-growing cod stocks tended to exhibit longer cycles and positive autocorrelations consistent with dilution of predation mortality by adjacent large year classes or age reading errors whereas fast growing cod stocks showed shorter cycles and no significant autocorrelation at lag 1. Both types exhibited significant negative autocorrelations consistent with cannibalism at one or more lags greater than lag 1.
Original languageEnglish
JournalCanadian Journal of Fisheries and Aquatic Sciences
Number of pages37
ISSN0706-652X
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • Atlantic cod
  • Recruitment
  • Periodic fluctuations
  • Autocorrelation
  • Cannibalism
  • growth

Cite this

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title = "Periodic fluctuations in recruitment success of Atlantic cod",
abstract = "Autocorrelation in recruitment success of fish is frequently reported, but the underlying mechanisms are generally only vaguely alluded to. We analysed recruitment success of cod 21 stocks in the North Atlantic to investigate possible common causes of autocorrelation in recruitment. We found autocorrelation and periodic fluctuations in recruitment success and adult growth in just above half of the stocks considered and investigated six possible underlying mechanisms. With three exceptions, the variations in recruitment success were not significantly related to temperature or growth anomalies, indicating that the variation was not caused by temperature dependent survival or growth dependent spawning products. Further, a link between recruitment and subsequent spawning biomass could not explain the observed recruitment patterns. Slow-growing cod stocks tended to exhibit longer cycles and positive autocorrelations consistent with dilution of predation mortality by adjacent large year classes or age reading errors whereas fast growing cod stocks showed shorter cycles and no significant autocorrelation at lag 1. Both types exhibited significant negative autocorrelations consistent with cannibalism at one or more lags greater than lag 1.",
keywords = "Atlantic cod, Recruitment, Periodic fluctuations, Autocorrelation, Cannibalism, growth",
author = "Anna Rindorf and Cadigan, {Noel G.} and Daniel Howell and Margit Eero and Henrik Gislason",
year = "2020",
doi = "10.1139/cjfas-2018-0496",
language = "English",
journal = "Canadian Journal of Fisheries and Aquatic Sciences",
issn = "0706-652X",
publisher = "N R C Research Press",

}

Periodic fluctuations in recruitment success of Atlantic cod. / Rindorf, Anna; Cadigan, Noel G.; Howell, Daniel; Eero, Margit; Gislason, Henrik.

In: Canadian Journal of Fisheries and Aquatic Sciences, 2020.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Periodic fluctuations in recruitment success of Atlantic cod

AU - Rindorf, Anna

AU - Cadigan, Noel G.

AU - Howell, Daniel

AU - Eero, Margit

AU - Gislason, Henrik

PY - 2020

Y1 - 2020

N2 - Autocorrelation in recruitment success of fish is frequently reported, but the underlying mechanisms are generally only vaguely alluded to. We analysed recruitment success of cod 21 stocks in the North Atlantic to investigate possible common causes of autocorrelation in recruitment. We found autocorrelation and periodic fluctuations in recruitment success and adult growth in just above half of the stocks considered and investigated six possible underlying mechanisms. With three exceptions, the variations in recruitment success were not significantly related to temperature or growth anomalies, indicating that the variation was not caused by temperature dependent survival or growth dependent spawning products. Further, a link between recruitment and subsequent spawning biomass could not explain the observed recruitment patterns. Slow-growing cod stocks tended to exhibit longer cycles and positive autocorrelations consistent with dilution of predation mortality by adjacent large year classes or age reading errors whereas fast growing cod stocks showed shorter cycles and no significant autocorrelation at lag 1. Both types exhibited significant negative autocorrelations consistent with cannibalism at one or more lags greater than lag 1.

AB - Autocorrelation in recruitment success of fish is frequently reported, but the underlying mechanisms are generally only vaguely alluded to. We analysed recruitment success of cod 21 stocks in the North Atlantic to investigate possible common causes of autocorrelation in recruitment. We found autocorrelation and periodic fluctuations in recruitment success and adult growth in just above half of the stocks considered and investigated six possible underlying mechanisms. With three exceptions, the variations in recruitment success were not significantly related to temperature or growth anomalies, indicating that the variation was not caused by temperature dependent survival or growth dependent spawning products. Further, a link between recruitment and subsequent spawning biomass could not explain the observed recruitment patterns. Slow-growing cod stocks tended to exhibit longer cycles and positive autocorrelations consistent with dilution of predation mortality by adjacent large year classes or age reading errors whereas fast growing cod stocks showed shorter cycles and no significant autocorrelation at lag 1. Both types exhibited significant negative autocorrelations consistent with cannibalism at one or more lags greater than lag 1.

KW - Atlantic cod

KW - Recruitment

KW - Periodic fluctuations

KW - Autocorrelation

KW - Cannibalism

KW - growth

U2 - 10.1139/cjfas-2018-0496

DO - 10.1139/cjfas-2018-0496

M3 - Journal article

JO - Canadian Journal of Fisheries and Aquatic Sciences

JF - Canadian Journal of Fisheries and Aquatic Sciences

SN - 0706-652X

ER -