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

Roman-Gonzalez, Alejandro, Scourse, James, Butler, Paul, Reynolds, David, Richardson, Christopher, Peck, Lloyd, Brey, Thomas and Hall, Ian 2017. Analysis of ontogenetic growth trends in two marine Antarctic bivalves Yoldia eightsi and Laternula elliptica: implications for sclerochronology. Palaeogeography, Palaeoclimatology, Palaeoecology 465 (B) , pp. 300-306. 10.1016/j.palaeo.2016.05.004

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Abstract

There is an increasing use of marine species as paleoclimate 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 the growth of both Y. eightsi and L. elliptica follow 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 growth rhythms is important not only for their biological significance but also in sclerochronological analysis because of their importance in developing paleoenvironmental reconstructions.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > Q Science (General)
Q Science > QL Zoology
Q Science > QP Physiology
Additional Information: Yoldia eightsi; Laternula elliptica; Endogenous rhythm; Southern Ocean; Sclerochronology; Shell growth
Publisher: Elsevier
ISSN: 0031-0182
Funders: President's Scholarship Award
Date of First Compliant Deposit: 2 June 2016
Date of Acceptance: 4 May 2016
Last Modified: 22 Feb 2019 22:23
URI: http://orca.cf.ac.uk/id/eprint/91180

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