Seasonality in the deep sea and tropics revisited: what can otoliths tell us?
Beatriz Morales-Nin A C and Jacques Panfili BA IMEDEA (CSIC/UIB), Miquel Marques 21, 07190 Esporles, Spain.
B IRD, B.P. 1386, 18524 Dakar, Senegal.
C Corresponding author. Email: beatriz.morales@uib.es
Marine and Freshwater Research 56(5) 585-598 https://doi.org/10.1071/MF04150
Submitted: 13 July 2004 Accepted: 12 April 2005 Published: 21 July 2005
Abstract
The accepted idea that fish otoliths from supposedly aseasonal environments, such as the deep sea and tropics, do not present seasonal growth increments is questioned and re-evaluated. The main seasonal fluctuation in deep seas is a result of the transfer of organic material from the productive upper layers to the abyssal depths. There is some evidence for seasonal patterns of otolith growth, although the validation of seasonal structures is limited owing to the difficulties inherent in deep-water studies. Tropical regions have an extremely high diversity of aquatic environments but in fact very few are aseasonal, and almost all areas have strong hydrological seasons, mainly annual, interacting with temperature variations. These climatic fluctuations have undoubtedly an effect on otolith growth, therefore leading to a succession of different incremental zones. The lack of previous knowledge on this impact of seasonality is probably a result of the previous low level of exploitation or economic interest of target species, and consequently the absence of age-based assessments. This trend has now changed possibly as a result of the increased exploitation of the resources, and to the greater involvement of international and national fishery management bodies. The number of studies showing apparent or validated seasonal marks has recently increased for these environments.
Extra keywords: aseasonality, deep-sea environment, seasonal increment, state of the art, tropical environment, validation.
Acknowledgments
We would like to acknowledge C. Roy (IRD, Brest), J.-P. Rébert (IRD, Paris) and J. Ruiz (ICMAN, Cadiz) for their help providing information on world climatic variations. We thank also Ms S. Swan and specially Dr J. M. Gordon (SAMS, UK) for their help in providing information on deep-sea fisheries and on Macrourids. D. Tracey (NIWA, New Zealand) who has kindly made available information in NIWA Reports is thanked with P. McMillan (NIWA, New Zealand) for the image and details used in Fig. 3. P. Tugores (IMEDEA) is thanked for technical assistance and D. Ponton (IRD, New-Caledonia) for helping with bibliography. We acknowledge R. Britton (Britton Traductions, France) for correcting the English and for constructive remarks on the article. Finally we would like also to acknowledge three reviewers and A. J. Fowler and S. E. Campana for constructive comments on a previous version of the manuscript.
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