Cold-water coral ecosystems from the Moira Mounds (NE … › download › 5_EUROFLEETS_Final... ·...
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Cold-water coral ecosystems from the Moira
Mounds (NE Atlantic):
the RV Belgica EUROFLEETS – CWC Moira cruise
S. Spezzaferri1 , G. Gennari1,, A. Vertino2, C. Stalder1, A. Wheeler3,
L. Naudts4, and the E-CWC Moira Cruise Scientific Party
Eurofleets Final Conference, Brussels, 13 June, 2013
1 Department of Geosciences, University of Fribourg, Switzerland 2 Department of Earth & Environmental Sciences, University of Milano-Bicocca, Italy
3 Department of Geology and Environmental Research Institute, University College Cork, Ireland
4 RBINS-MUMM, Belgium
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fro
m
Cold-water corals
• Temperature (4-12°C)
• High surface productivity
• Favourable substratum
• High currents regime
• Water density
after Roberts et al., 2006; Foubert et al.,
2008; Dullo et al., 2008
(United Nations Environmental Program, 2005)
Eurofleets Final Conference, Brussels, 13 June, 2013
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Aims of the EUROFLEET-CWC MOIRA cruise
1 . Collect seafloor and seawater samples for characterizing
CWC habitats and their biomineralized benthic facies.
2. Collect box-core samples to carry out a comparative study
between NE Atlantic and Mediterranean CWC benthic habitats
and facies.
3. To increase our knowledge on CWC ecosystem biodiversity
by performing taxonomic (and genetic) analysis of all collected
organisms.
Eurofleets Final Conference, Brussels, 13 June, 2013
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Wheeler et al., 2005
The Belgica Province
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Wheeler et al., 2007
Wheeler et al., 2005
Wheeler et al., 2011
Thérèse Mound Moira Mounds
210 m
1.5 Km
De Mol et al., 2007
Thérèse Mound
Moira Mounds
Eurofleets Final Conference, Brussels, 13 June, 2013
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• 7 MM have been investigated by ROV and
• 1 by box-coring
• 256 MM identified so far on the basis of SSS
imaging
Moira Mounds:
• Occur in water depths between 900 and
1080 m
• Diameter up to 40-50 m
• Heigths up to 10 m
• Slope gradients: 15-20°
Eurofleets Final Conference, Brussels, 13 June, 2013
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Why the Moira Mounds?:
• had been previously interpreted as possible
early stage of giant coral mounds
Roberts et al., 2006
• were already acoustically and video
surveyed during previous cruises
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Area 2
Area 1
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from Wheeler et al., 2011
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EA400 Echosounder
Box-coring
GAPS
Positioning system
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Box-core described and subsampled
Selected samples
preserved in ethanol
Eurofleets Final Conference, Brussels, 13 June, 2013
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Samples sieved
onboard
CTD profiles and
water sampling
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CORAL FRAME AND CORAL RUBBLE (CF-CR)
SAND AND DROPSTONES (SD)
SAND AND BIOGENIC GRAVEL (S-BG)
Bio-sedimentary facies
MOUNDS TOP
INTERMOUNDS AREA
INTERMOUNDS AREA
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Bio-sedimentary facies
CORAL FRAME AND CORAL RUBBLE (CF-CR)
dominance of frame-building corals (L. pertusa, M. oculata, D. dianthus) and
subordinate sandy to muddy sandy sediment
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Madrepora oculata Lophelia pertusa
Lophelia corallites
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Madrepora
ophiuroids
encrusting
sponges
Hydrozoan Desmophyllum dianthus
Gorgonian colony
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Bioeroded coral frame showing
activity of boring organisms
Actinians
Stalked crinoid on sponge
Apocallisted bocagei
Sessile echinoderm (Psolus sp.)
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cirriped
Verruca stroemia
ophiuroid
gastropods
Calliostoma sp.
Amphissa acuticostata
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Bio-sedimentary facies
SAND AND DROPSTONES (SD)
Sandy to muddy sandy sediments and heterometric dropstones from densely to
loosely distributed on the soft sediment
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Bio-sedimentary facies
SAND AND BIOGENIC GRAVEL (S-BG)
samples whose surface is dominated by sandy to muddy- sandy sediment
and/or by bioclastic gravel
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Bio-sedimentary facies
SAND AND BIOGENIC GRAVEL (S-BG)
samples whose surface is dominated by sandy to muddy- sandy sediment
and/or by bioclastic gravel
agglutinant polychaete encrusting
a dead Lophelia branch
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Bio-sedimentary facies
transitional SD to BG transitional SD to S
transitional BG to CR
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Station 18, CTD cast A
MOW?
Dullo et al., 2008
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Conclusions
1. The bio-sedimentary facies observed in the collected box-
cores can be grouped in three main categories (CF-CR; SD;
S-BG).
2. Living frame-building corals are mainly represented by M.
oculata and L. pertusa.
3. All exposed coral branches devoid of soft tissue are intensely
colonised by a diverse epifauna.
4. CTD profiles show an increase in salinity at around 900-1000
m depth, possibly due to the influence of MOW.
Eurofleets Final Conference, Brussels, 13 June, 2013
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Press relese
EUROFLEETS and the BELGICA (Galway 4-9 juni
2012). 31 May 2012: The Belgica will be... Swiss next
week!
http://www.mumm.ac.be/EN/News/index.php?page=
7&total=285
Newspaper article
Le role climatique des coreaux d’eau froide. La Liberté,
24 July, 2012, p. 1 and 7.
Radio emission
4 June 2012. Les ecosystems à coreaux d’au froides.
La croisièe océnographique Eurofleets
CWC-Moira (Porcupine Basin) avec le RV Belgica.
Le site de la Radio Télevision Belge Francophone
(RTBF).
http://podaudio.rtbf.be/pod/lp-nuwa_nuwa_
292f062f2012_coup_d27oeil_sur_la_pl_12092297.mp3
Eurofleets Final Conference, Brussels, 13 June, 2013
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Output so far:
1 chapter in a monograph
1 abstract published
2 presentations
More is coming!
Eurofleets Final Conference, Brussels, 13 June, 2013
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Thank you!
We are ready for the next…
RV Marion Dufresne EUROFLEETS - Mediterranean Gateway
10-21 June 2013, many swiss on board
15 Participants: 2 Bachelor students, 2 Master students, 5 PhD students
1 young post-doc, 5 senior scientists
Eurofleets Final Conference, Brussels, 13 June, 2013