Abiotic controls on chemoautotrophic primary producer succession at deep-sea hydrothermal vent inferred from in situ chemical monitoring

Deep-sea submarine volcanic eruptions on mid ocean ridges provide an opportunity to investigate the environmental factors associated with the succession of dominant chemoautotrophic primary producers. Between 2006 and 2012, we have investigated the physico-chemical conditions of diffuse-flow habitats displaying a typical successional sequence of recolonisation at EPR9°50’N. Combined in situ measurements of temperature, pH and hydrogen sulfide, three parameters linked with stress conditions and available energy, allowed to compare different stages of colonisation. While several studies have emphasized changes in fluid properties as a driver of species predominance over time, our results show that the ability of the two tubeworm species, Riftia pachyptila and Tevnia jerichonana, in forming mature assemblages is not necessarily related to the S/T ratio of diffuse fluids. This ratio did not show substantial variation over the transition period. Beyond the primary role of biological interactions on larvae settlement, individual growth could still correlate with different habitat conditions. Rather than change in fluid properties, these differences might reflect fluctuation in the mixing ratio, highlighting the role of temporal dynamics as a major control on primary producers in these ecosystems.

Your format preference:: 
Oral Presentation
Would you be interested in publishing this conference paper in a special issue of Marine Ecology?: 
Yes
First Name: 
Nadine
Last Name: 
Le Bris
Telephone: 
0430192414
Affiliation: 
Université Paris 6 -CNRS LECOB
First Name: 
Leonardo
Last Name: 
Contreira-Pereira
Affiliation: 
University Paris 6 -CNRS LECOB
First Name: 
Mustafa
Last Name: 
Yücel
Affiliation: 
University Paris 6 -CNRS LECOB
First Name: 
Stefan
Last Name: 
Sievert
Affiliation: 
WHOI Biology Department
First Name: 
Lauren
Last Name: 
Mullineaux
Affiliation: 
WHOI Biology Department
Choose keywords that are most applicable to your abstract. (Three maximum.): 
Trophic relations (including symbiosis)
Ecological Interactions
Abstract ID: 
CBE5-156