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Oral presentation at the 9th International Coral Reef
Symposium, October 2000, Bali, Indonesia
FISH COMMUNITIES ON JORDANIAN CORAL REEFS AND ADJACENT
HABITATS
IN THE GULF OF AQABA, RED SEA
Khalaf, M.A.* & Kochzius, M.**
*Marine Science Station (MSS), University of Jordan, P.O. Box 195, Aqaba,
Jordan. maroof@ju.edu.jo
**Centre for Tropical Marine Ecology (ZMT), Fahrenheitstr. 1, 28359
Bremen, Germany. kochzius@uni-bremen.de
This study investigates for the first time the fish communities
of shallow water habitats along the Jordanian coast. Transects of 50 m
length were marked at six sites along the Jordanian coast. At each site
visual censuses were conducted along three transects at 6 m respectively
12 m depth. In this study 202 species belonging to 123 genera and 43 families
were identified. Most individuals belong to the families Serranidae, subfamily
Anthininae (37.1%), Pomacentridae (22.3%) and Labridae (8.0%). The most
abundant species are Pseudanthias squamipinnis (36.8 %), Pomacentrus
trichourus (6.0 %), Atherinomorus lacunosus (5.1 %) and
Paracheilinus octotaenia (3.7 %). Multivariate analysis of the data
is based on Bray–Curtis similarities. Cluster analysis of the sites shows
three main clusters: the seagrass dominated Al Mamlah Bay and the 6 m and
12 m transects of the coral dominated sites. This indicates different fish
communities at 6 and 12 m depth as well as in the seagrass dominated Al
Mamlah Bay. Confirmation of this pattern is evidenced by an ANOSIM significance
test. This picture can be connected to the benthic substrate. Cluster analysis
of the benthic habitat composition gives the same pattern. Analysis by
species shows two main clusters, one representing fishes of the coral habitat,
the other fishes of the seagrass beds. A biogeographic comparison based
on presence/absence of species showed decreasing similarity of fish communities
from the northern tip of the Gulf of Aqaba going south through the Red
Sea proper into the Indian Ocean.
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