New insights into oyster high-resolution hinge growth patterns

Type Article
Date 2019-04
Language English
Author(s) Huyghe Dimitri1, 2, de Rafelis Marc2, Ropert MichelORCID3, Mouchi Vincent1, 4, Emmanuel Laurent4, Renard Maurice4, Lartaud Franck1
Affiliation(s) 1 : Sorbonne Université, CNRS, Laboratoire d’Ecogéochimie des Environnements Benthiques, LECOB, Observatroire Océanologique de Banyuls, 66650 Banyuls‑sur‑Mer, France
2 : Géosciences Environnement Toulouse, CNRS, IRD, Université Paul Sabatier Toulouse 3, 14 Avenue Edouard Belin, 31400 Toulouse, France
3 : Ifremer, Laboratoire Environnement Ressource de Normandie, Avenue du General de Gaulle, BP 32, 14520 Port.en.Bessin, France
4 : Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, ISTeP, 75005 Paris, France
Source Marine Biology (0025-3162) (Springer Nature), 2019-04 , Vol. 166 , N. 4 , P. 48 (17p.)
DOI 10.1007/s00227-019-3496-2
WOS© Times Cited 14
Abstract

While oyster shells are one of the most common mollusks used for the analysis of (paleo)environmental and (paleo)climatic records based on geochemical proxies, high-resolution growth rate changes still need to be determined. Promising previous works are restricted to small portions of shell sections due to difficulties in continuous growth increment revelation. Based on a mark and recapture experiment of Magallana gigas specimens reared in an intertidal area of Normandy (France) for 22 months, and a sclerochronological approach using cathodoluminescence microscopy, this study provides the longest high-resolution record of growth increments in oyster shells to date. Different growth patterns were identified likely related to the oyster age. After age 1 year, the formation of growth increments follows an expected tide-related model, leading to the mineralization of ~ 2 calcitic increments per day, together with growth rate changes at lunar and semi-lunar periodicities, and a seasonal trend with occasional growth breaks during winter when temperatures fall below ~ 6 °C. However, for oysters younger than 1 year, i.e., before reaching their sexual maturity, the growth increment analysis reveals unconventional patterns. In this case, oysters’ growth is associated with either a large number (~ 5) or less than one increment per day depending on the period. This pattern is also associated with frequent growth cessations, although the growth rate of the shell is high at this period. Our results illustrate that the high-resolution sclerochronological approach is required for accurate paleoenvironmental reconstructions based on oyster shells.

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