CO2 generation by calcified invertebrates along rocky shores of Brittany, France

Christian Hily 1, * Jacques Grall 2 Laurent Chauvaud 1 Morgane Lejart 1 Jacques Clavier 1
* Auteur correspondant
1 LEMAR - Laboratoire des Sciences de l'Environnement Marin (LEMAR)
2 UBO - Université de Brest
Abstract : Many autochthonous and alien macroinvertebrates of the intertidal zone are biocalcifiers, and the present study proposes a first assessment of their calcimass and their annual calcium carbonate (CaCO3) production at a regional scale, along 500 km of the coastline of Brittany, France, which represents a wide range of the rocky-shore habitats commonly encountered in the north-eastern Atlantic region. All sites considered together gave a mean calcimass estimate of 5327 g m-2. The corresponding mean CaCO3 gross production was 2584 g m-2 year-1. The net production (including dissolution) by biocalcification was 2384 g CaCO3 m-2 year-1. Estimations of CO2 production via both calcification and respiration were carried out in particular for the phylum Mollusca and for crustacean barnacles, dominating in terms of calcimass. Mean CO2 production obtained by summing CO2 fluxes related to net CaCO3 production and respiration for all sampled sites was 22.9 mol m-2 year-1. These results illustrate the significance of CO2 production during biogenic CaCO3 precipitation of intertidal invertebrates in such temperate coastal environment compared with tropical zones and the contribution of the shelves to the global CaCO3 budget.
Keywords : biocalcification CaCO3 production CO2 macrozoobenthos rocky shores temperate
Type de document :
Article dans une revue
Marine and Freshwater Research, CSIRO Publishing, 2013, 64 (2), pp.91-101. 〈10.1071/MF12146M〉
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http://hal.univ-brest.fr/hal-00816968
Contributeur : Adminhal Univbrestbu <>
Soumis le : mardi 23 avril 2013 - 13:45:28
Dernière modification le : jeudi 11 janvier 2018 - 06:22:24

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Christian Hily, Jacques Grall, Laurent Chauvaud, Morgane Lejart, Jacques Clavier. CO2 generation by calcified invertebrates along rocky shores of Brittany, France. Marine and Freshwater Research, CSIRO Publishing, 2013, 64 (2), pp.91-101. 〈10.1071/MF12146M〉. 〈hal-00816968〉

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