Article (Scientific journals)
Contribution of a Dense Population of the Brittle Star Acrocnida brachiata (Montagu) to the Biogeochemical Fluxes of CO2 in a Temperate Coastal Ecosystem
Davoult, D.; Harlay, Jérôme; Gentil, F.
2009In Estuaries and Coasts, 32 (6), p. 1103-1110
Peer reviewed
 

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Abstract :
[en] The production of organic matter and calcium carbonate by a dense population of the brittle star Acrocnida brachiata (Echinodermata) was calculated using demographic structure, population density, and relations between the size (disk diameter) and the ash-free dry weight (AFDW) or the calcimass. During a 2-year survey in the Bay of Seine (Eastern English Channel, France), organic production varied from 29 to 50 g(AFDW) m(-2) year(-1) and CaCO3 production from 69 to 104 g(CaCO3) m(-2) year(-1). Respiration was estimated between 1.7 and 2.0 mol(CO2) m(-2) year(-1). Using the molar ratio (psi) of CO2 released: CaCO3 precipitated, this biogenic precipitation of calcium carbonate would result in an additional release between 0.5 and 0.7 mol(CO2) m(-2) year(-1) that represented 23% and 26% of total CO2 fluxes (sum of calcification and respiration). The results of the present study suggest that calcification in temperate shallow environments should be considered as a significant source of CO2 to seawater and thus a potential source of CO2 to the atmosphere, emphasizing the important role of the biomineralization (estimated here) and dissolution (endoskeletons of dead individuals) in the carbon budget of temperate coastal ecosystems.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Davoult, D.
Harlay, Jérôme ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique
Gentil, F.
Language :
English
Title :
Contribution of a Dense Population of the Brittle Star Acrocnida brachiata (Montagu) to the Biogeochemical Fluxes of CO2 in a Temperate Coastal Ecosystem
Publication date :
2009
Journal title :
Estuaries and Coasts
ISSN :
1559-2723
eISSN :
1559-2731
Publisher :
Springer, New York, United States - New York
Volume :
32
Issue :
6
Pages :
1103-1110
Peer reviewed :
Peer reviewed
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