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Marine Ecology Progress Series

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MEPS 558:21-33 (2016)  -  DOI:

Traits controlling body size in copepods: separating general constraints from species-specific strategies

Neil S. Banas1,*, Robert G. Campbell2

1Department of Mathematics and Statistics, University of Strathclyde, Glasgow G1 1XQ, UK
2Graduate School of Oceanography, University of Rhode Island, Narragansett, RI 02881, USA
*Corresponding author:

ABSTRACT: A new synthesis of laboratory measurements of food-saturated development and growth across diverse copepod taxa was conducted in a theoretical framework that distinguishes general allometric constraints on copepod physiology from contingent strategies that correlate with size for other reasons. After temperature correction, the allometry of growth rate is inconsistent between the ontogeny of Calanus spp., where it follows the classic -0.3 power-law scaling, and a broader spectrum of adult size Wa (0.3 to 2000 µg C, Oithona spp. to Neocalanus spp.), across which the classic scaling appears to represent only an upper limit. Over the full size spectrum, after temperature correction, a growth rate g0 relative to the -0.3 power law correlates with adult size better than does relative (temperature-corrected) development rate u0; in contrast, at a finer scale of diversity (among Calanus spp., or among large (>50 µg C) calanoids in general), u0 is the better correlate with adult size and the effect of g0 is insignificant. Across all these scales, the ratio of relative growth and development rates g0/u0 is a better predictor of adult size than g0 or u0 alone, consistent with a simple model of individual growth.

KEY WORDS: Copepods · Body size · Development rate · Growth rate · Zooplankton · Trait-based · Diversity

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Cite this article as: Banas NS, Campbell RG (2016) Traits controlling body size in copepods: separating general constraints from species-specific strategies. Mar Ecol Prog Ser 558:21-33.

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