Journal of the Marine Biological Association of the UK

Research Article

An assemblage of the host anemone Heteractis magnifica in the northern Red Sea, and distribution of the resident anemonefish

Thea Marie  Brolund a1p1, Anders  Tychsen a2, Lis Engdahl  Nielsen a1 and Michael  Arvedlund a3
a1 The August Krogh Institute, University of Copenhagen, Universitetsparken 13, DK-2100 Copenhagen Ø, Denmark
a2 Geological Museum, University of Copenhagen, Øster Voldgade 5–7, DK-1350 Copenhagen K, Denmark
a3 Sesoko Station, Tropical Biosphere Research Center, University of the Ryukyus, 3422 Sesoko, Motobu, Okinawa 905-0227, Japan

Article author query
brolund tm   [PubMed][Google Scholar] 
tychsen a   [PubMed][Google Scholar] 
nielsen le   [PubMed][Google Scholar] 
arvedlund m   [PubMed][Google Scholar] 


The Heteractis magnifica assemblage at the tip of the Sinai Peninsula was examined. The actinian size, location, and number of resident anemonefishes were recorded. The anemones were found at depths down to approximately 40 m and the sizes of clustering H. magnifica and clusters were positively correlated with depth. The shallow waters of the anemone assemblage contained few mainly small, solitary actinians. There seemed to be a tendency for solitary actinians to cluster once they reached a certain size-range. The resident anemonefishes Amphiprion bicinctus and Dascyllus trimaculatus were present in very large numbers (approximately 250 and 1800 respectively) and the A. bicinctus home range size was positively correlated with depth.

(Received April 26 2004)
(Accepted May 9 2004)

p1 Present address of corresponding author: Department of Marine Biology, James Cook University, Townsville QLD 4811, Australia, E-mail: