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Abstract
Cold-Water Corals on the Tisler Reef: Preliminary observations on the dynamic reef environment
Highlights
In t r o d uc t i o n The occurrence of the scleractinian cold-water corals Lophelia pertusa and Madrepora oculata is strongly dependent on environmental variables, those related to (1) water depth, (2) water temperature (4–12°C; Dodds et al, 2007), (3) availability of hard substrata for colonization (Wilson, 1979; Mortensen et al, 2001; Freiwald, 2002; Freiwald et al, 2004), and (4) suitable food supply
There is a need for a quantitative approach to determine the hydrodynamics, particulate organic matter (POM) supply, and respiration of the corals and associated fauna (O2 uptake) so that we can better understand the environmental services that cold-water coral reefs provide, in terms of carbon and nutrient remineralization
The advantages of this particular location are that it is close to the facilities of the Tjärno Marine Biological Laboratory (TMBL, University of Gothenburg), it is protected from the ocean so that relatively small vessels can be used to reach and work on it, and its water depth is relatively shallow (< 200 m), allowing easy operation of the TMBL remotely operated vehicle (ROV)
Summary
In t r o d uc t i o n The occurrence of the scleractinian cold-water corals Lophelia pertusa and Madrepora oculata is strongly dependent on environmental variables, those related to (1) water depth (i.e., below the photic zone from 50–1000 m at high latitudes and up to 4000-m water depth at low latitudes; Roberts et al, 2006), (2) water temperature (4–12°C; Dodds et al, 2007), (3) availability of hard substrata for colonization (Wilson, 1979; Mortensen et al, 2001; Freiwald, 2002; Freiwald et al, 2004), and (4) suitable food supply. An additional advantage of the Tisler reef for our experiments is that it is located in a long gully, forcing the currents in a northwest-southeast direction, which makes it easier to measure a possible reef effect on the quality and quantity of particles in the near-bottom water.
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