Marine & Environmental Sciences Faculty Articles
Document Type
Article
Publication Date
12-31-1996
Publication Title
Marine Ecology Progress Series
Keywords
Coral, Sediment, Shape, Ecology, South Africa
ISSN
0171-8630
Volume
145
First Page
87
Last Page
93
Abstract
Advantages and disadvantages of a funnel-shaped growth in 2 coral species (Acropora clathrata, Turbinaria peltata) in a high-sedimentation environment (Natal, South Africa) were observed in the field and modeled in a flow tank. Funnel-shaped growth serves different purposes in different hydrographic settings. In calm waters with little currents (in our case deep reef areas, 18 to 25 m) funnel-shaped colonies served as 'sacrificial sediment traps': all sediment trapped inside the funnel was directed towards the centre, where it was concentrated. There, tissues underwent necroses, but all other tissues remained sediment free and healthy. In areas with high currents (in our case shallower reef areas with high surge, 8 to 14 m) funnels tended to be self-cleaning. By a process of vortex shedding, mass replacement of fluid within the funnel also led to the removal of all sediment. Current speeds between 30 and 90 cm s-1 were enough to clean the funnels of 3 experimental grain sizes (coarse, fine, medium sand).
NSUWorks Citation
Bernhard Riegl, Carlton Heine, and George M. Branch. 1996. Function of Funnel-Shaped Coral Growth in a High-Sedimentation Environment .Marine Ecology Progress Series : 87 -93. https://nsuworks.nova.edu/occ_facarticles/336.
ORCID ID
0000-0002-6003-9324
ResearcherID
F-8807-2011
DOI
10.3354/meps145087
Comments
©Inter-Research 1996