Somatic growth of mussels Mytilus edulis in field studies compared to predictions using BEG, DEB, and SFG models

Poul Scheel Larsen, Ramón Filgueira, Hans Ulrik Riisgård

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Prediction of somatic growth of blue mussels, Mytilus edulis, based on the data from 2 field-growth studies of mussels in suspended net-bags in Danish waters was made by 3 models: the bioenergetic growth (BEG), the dynamic energy budget (DEB), and the scope for growth (SFG). Here, the standard BEG model has been expanded to include the temperature dependence of filtration rate and respiration and an ad hoc modification to ensure a smooth transition to zero ingestion as chlorophyll a (chl a) concentration approaches zero, both guided by published data. The first 21-day field study was conducted at nearly constant environmental conditions with a mean chl a concentration of C=2.7μgL−1, and the observed monotonous growth in the dry weight of soft parts was best predicted by DEB while BEG and SFG models produced lower growth. The second 165-day field study was affected by large variations in chl a and temperature, and the observed growth varied accordingly, but nevertheless, DEB and SFG predicted monotonous growth in good agreement with the mean pattern while BEG mimicked the field data in response to observed changes in chl a concentration and temperature. The general features of the models were that DEB produced the best average predictions, SFG mostly underestimated growth, whereas only BEG was sensitive to variations in chl a concentration and temperature. DEB and SFG models rely on the calibration of the half-saturation coefficient to optimize the food ingestion function term to that of observed growth, and BEG is independent of observed actual growth as its predictions solely rely on the time history of the local chl a concentration and temperature.
Original languageEnglish
JournalJournal of Sea Research
Volume88
Pages (from-to)100-108
ISSN1385-1101
DOIs
Publication statusPublished - 2014

Keywords

  • Energy budget
  • Specific growth rate
  • Modelling
  • Chl a
  • Mussel growth
  • Mytilus edulis

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