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Dr Martin Hovland
Ambio Tech Team / Norske Shell, Stavanger
(Professor emeritus CGB, UiB)
SPONGES ASSOCIATED WITH LOPHELIA
REEFS OFF MID-NORWAY
- AND OTHER RARE BIOTOPES
Workshop on seabed habitats of Environmental Concern
Oslo, October, 2013
CONTENTS
• Brief history
• Imaging Lophelia reefs, 1982 - 2013
• Sponges on Lophelia-reefs
• NDP project: Compilation of images from Statoil and
Norske Shell
• Other relevant biotopes: ’Fauna’ reef and Nyegga
• Conclusions
F
H
Investigating anomalies
”ground truthing”
Integral part of infrastructure
development
Norwegian oil and gas transport sytems, 1980 - 2005
From Hovland & Mortensen, 1999
Industry Survey methodollgy
History of industrial (Statoil) documentation of biotopes
- Cold water corals, 1982 (Fugløyreef) – 2010 (Faunareef)
- Seep-related bioherms, 1983 (Tommeliten)
- Pockmark carbonates, 1985 (Gullfaks), 2005 (Troll)
- Fish pockmark cavern, 1985 (Gullfaks)
- Pockmark Lophelia / Acesta reefs, 2004 (Kristin, Morvin)
- Gas hydrate biotopes, 2004, Nyegga
-Unit pockmark relationship, 2010, Faunareef, Morvin
Main Q: who do we report to on such findings?
Easy A: - Nationally: Nobody seems interested –
- Internationally: Several institutions and groups
Hovland et al., 2012.
LOPHELIA REEF IN HIGH-RESOLUTION
v.e. = 3, resolution = 0,5m x 0,5m.
W.d. 274-305 m Lctn. W of SR
ca20m
U-p density:
0 – 16 per 103m2
THE UNIT-PM ENVIRONMENT
The Flustra sp has also been seen
on wellheads at Sleipner – any link
with chemosynth?
From Hovland et al., 2012. Photos courtesy of Statoil
MARKER AT HRC REEF C (1991-1997)
From Hovland & Mortensen, 1999
A prolific
environment?
Photo courtesy of Statoil
NDP-PROJECT (COMPILATION OF IMAGES)
MAIN OBJECTIVES
To:
- Produce a catalogue (Atlas) over sponges associated with
Lophelia-reefs off Mid-Norway.
- Acquire data (stills and video) from Statoil and Norske
Shell A/S that can be used in a catalogue
(publically available via NOG?).
- Seek (hire) relevant professional expertise from
UiB/IMR/DnV or others to identify the sponge species
from acquired images.
Detail from Reef KA2
(Pockmark-Lophelia reef
At the Kristin field)
Photos and image courtesy of Statoil From Jensen et al., 2008
Ag Ae Anthotela grandiflora A. excavata
Morvin reference reef 08 (MRR08)
Photos and 3D-image, courtesy of Statoil
’Unit pockmarks’ and Lophelia-reefs at Morvin
Image courtesy of Statoil from Hovland et al., 2012
Dead portion
Live portion
with available imagery
OTHER RELEVANT LOCATIONS
AND BIOTOPES
e.g., from
-Nyegga, at 750 m water depth, T= - 0.7 C
THE NYEGGA ZOO….
…relying on energy from below…?
Hovland et al. (2006) Photo courtesy of Statoil
Arrow points at hydrate pingo, inside cryptic caronate env.
CONCLUSIONS
- There are numerous sponges associated with
- Lophelia-reefs off mid-Norway
- There is prolific animal growth associated with
- Seep features like pockmarks and hydrates
- Seafloor biotopes are complex and can be
- Associated with the substratum
- However, much work is needed to find out more.
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