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Marine Biology

, Volume 142, Issue 5, pp 925–935 | Cite as

The effects of an extraordinary El Niño / La Niña event on the size and growth of the squid Loligo opalescens off Southern California

  • G. D. Jackson
  • M. L. Domeier
Article

Abstract

The population structure of the California market squid Loligo opalescens was studied for the Channel Islands region off Southern California between June 1998 and March 2000. During this time Californian waters were exposed to an extraordinary El Niño event that was possibly the most dramatic change in oceanographic conditions that occurred last century. There was then a rapid transition to record cool La Niña conditions. Statolith increments were used to determine age parameters and increment periodicity was validated for the first 54 days of life. Based on statolith increment counts, the oldest males and females were 257 and 225 days respectively and individuals matured as young as 129 and 137 days respectively. No distinct hatching period was detected. There was a general trend of increasing body size throughout the study period. Squid that hatched and grew through the El Niño were strikingly smaller and had slower growth rates compared to squid that grew through the La Niña. This was related to oceanography and associated productivity. There was a positive correlation between squid mantle length and upwelling index and a negative correlation between mantle length and sea temperature. The 'live-fast die-young' life history strategy of squid makes them ideal candidates for following the effects of the dramatic changes in oceanographic conditions off California. We propose that squid can serve as ecosystem recorders and productivity integrators over time and space and are useful organisms to tie oceanography to biology.

Keywords

Mantle Length California Current Californian Water Californian Coastal Water Large Squid 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

This research was made possibly from grants from the Offield Family Foundation, the George T. Pfleger Foundation and the Australian Research Council. We would like to thank commercial fishers of Southern California who assisted with supplying squid specimens and Erica Vidal for providing squid grown at Galveston. We are also grateful to Natalie Moltschaniwskyj who assisted with statistical advice, Emma Hatfield for interesting discussions on L. opalescens and Howard Choat, Ron O'Dor and two anonymous referees who made useful comments during the preparation of the manuscript.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Institute of Antarctic and Southern Ocean StudiesUniversity of TasmaniaHobartAustralia
  2. 2.Pfleger Institute of Environmental ResearchOceansideUSA

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