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What can size distributions within cohorts tell us about ecological processes in fish larvae?
Folkvord, A.; Fiksen, Ø.; Høie, H.; Johannessen, A.; Otterlei, E.; Vollset, K.W. (2009). What can size distributions within cohorts tell us about ecological processes in fish larvae? Sci. Mar. (Barc.) 73(Suppl. 1): 119-130. https://hdl.handle.net/10.3989/scimar.2009.73s1119
In: Scientia Marina (Barcelona). Consejo Superior de Investigaciones Científicas. Institut de Ciènces del Mar: Barcelona. ISSN 0214-8358; e-ISSN 1886-8134, meer
Peer reviewed article  

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Trefwoorden
    Availability > Food availability
    Concentration
    Environmental effects > Temperature effects
    Growth rate
    Interspecific relationships > Predation
    Life history
    Population characteristics > Population structure > Size distribution
    Population functions > Mortality
    Marien
Author keywords
    growth strategies; life history; mortality; prey concentration; sizedistribution; temperature; trade-off

Auteurs  Top 
  • Folkvord, A.
  • Fiksen, Ø.
  • Høie, H.
  • Johannessen, A.
  • Otterlei, E.
  • Vollset, K.W.

Abstract
    Marine fish larvae are subject to variable environments, which is probably reflected in their growth and survival rates. Mortality rates are generally high and size-dependent. At the species level, these mortality rates are usually accompanied by correspondingly high growth rates. Here we provide examples from experimental studies with Atlantic cod (Gadus morhua) and Atlantic herring (Clupea harengus) larvae, in which multiple cohorts were followed over time. Body size, prey concentrations, and temperature are shown to influence growth rates. We present a method based on Cumulative size distributions (CSDs) for visualizing variability of sizes within cohorts over time. Analysis of CSDs revealed size-selective mortality and variations among populations in size- and temperature-dependent growth throughout ontogeny. We found that cod larvae consistently exhibit higher growth rates than herring larvae. While cod larvae may have an advantage over herring larvae when food availability is high, herring were more able to survive at low food concentrations than cod. Cod and herring seem to represent two growth strategies: cod larvae are relatively small at hatching and a high growth rate appears to be a prerequisite for success, whereas herring larvae are initially large, but grow more slowly.

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