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JPR Advance Access published online on February 19, 2008
Journal of Plankton Research, doi:10.1093/plankt/fbn030
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Effects of intra- and inter-annual variability in prey field on the feeding selectivity of larval Atlantic mackerel (Scomber scombrus)

Dominique Robert1,*, Martin Castonguay2 and Louis Fortier1

1 Québec-Océan, Département de Biologie, Université Laval, 1045 avenue de la Médecine, Québec, QC, Canada, G1V 0A6 louis.fortier{at}bio.ulaval.ca 2 Institut Maurice-Lamontagne, Ministère des Pêches et des Océans, CP 1000, Mont-Joli, QC, Canada, G5H 3Z4 CastonguayM{at}dfo-mpo.gc.ca

* Correspondance: e-mail: dominique.robert{at}giroq.ulaval.ca phone: +1 (418) 656-5917 fax: +1 (418) 656-2339

Received on February 13, 2008; revised on February 13, 2008; accepted on February 15, 2008


  Abstract

We identified to the lowest taxonomical level possible the preferred prey of Atlantic mackerel larvae from the southern Gulf of St. Lawrence, and assessed the extent to which prey selectivity varied within and among years. Mackerel larvae and their zooplankton prey were sampled in the summer of four consecutive years (1997-2000). The nauplii of the calanoid copepod Pseudocalanus sp. strongly dominated the diet of larvae <7 mm both in terms of numbers and carbon content, while larvae ≥7 mm mainly fed on fish larvae (including conspecifics) and cladocerans. Chesson's alpha index revealed strong selectivity in all years for Pseudocalanus sp. nauplii in first-feeding larvae. Selectivity shifted to cladocerans and fish larvae around a body length of 7 mm. Intra- and inter-annual prey selectivity changes were mainly observed for alternative prey, during the period surrounding the shift in diet from small to large prey. Our results underscore the importance of considering the availability of the main prey Pseudocalanus sp. nauplii (early larval stage) as well as cladocerans and fish larvae (late larval stage), rather than the entire prey field in the future assessment of the role played by prey availability on larval mackerel vital rates.

Key Words: Fish larvae • Prey selectivity • Pseudocalanus spp. • Atlantic mackerel • Scomber scombrus

Communicating Editor: Dr Roger Harris


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