Analysis of ontogenetic growth trends in two marine Antarctic bivalves Yoldia eightsi and Laternula elliptica: Implications for sclerochronology

Alejandro Román-González*, James D. Scourse, Paul G. Butler, David J. Reynolds, Christopher A. Richardson, Lloyd S. Peck, Thomas Brey, Ian R. Hall

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

There is an increasing use of marine species as palaeoclimate recorders for the marine realm. These archives provide novel baseline records of past oceanographic variability in regions devoid of instrumental observations. Here we report results of a study of the ontogenetic growth pattern of two Antarctic marine bivalve molluscs: Yoldia eightsi and Laternula elliptica from West Antarctic Peninsula populations using negative exponential detrending technique and multi-taper method spectral analysis. Our data show that the growth of both Y. eightsi and L. elliptica follows a general negative exponential trend over their longevity. However, our analyses also identified an innate 9.06 year periodic endogenous growth rhythm in the growth increment pattern of Y. eightsi and two innate periodic growth rhythms, 5 and 6.6 year period, were found in L. elliptica. We hypothesize that the Y. eightsi endogenous growth rhythm may be related to the reallocation of energetic resources between somatic growth and gametogenesis although more biological data are required to test this hypothesis. Further work into L. elliptica biology is required to understand the possible meaning of the innate growth rhythms found for this species. The identification of growth rhythms is important not only for their biological significance but also in sclerochronological analysis because of their importance in developing palaeoenvironmental reconstructions.

Original languageEnglish
Pages (from-to)300-306
Number of pages7
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume465
Early online date11 May 2016
DOIs
Publication statusPublished - 1 Jan 2017

Keywords

  • Endogenous rhythm
  • Laternula elliptica
  • Sclerochronology
  • Shell growth
  • Southern Ocean
  • Yoldia eightsi

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