Dr. Bellwood et Pc. Wainwright, Locomotion in labrid fishes: implications for habitat use and cross-shelf biogeography on the Great Barrier Reef, CORAL REEF, 20(2), 2001, pp. 139-150
Coral reefs exhibit marked zonation patterns within single reefs and across
continental shelves. For sessile organisms these zones are often related t
o wave exposure. We examined the extent to which wave exposure may shape th
e distribution patterns of fishes. We documented the distribution of 98 spe
cies of wrasses and parrotfishes at 33 sites across the Great Barrier Reef.
The greatest difference between labrid assemblages was at the habitat leve
l, with exposed reef fiats and crests on mid- and outer reefs possessing a
distinct faunal assemblage. These exposed sites were dominated by individua
ls with high pectoral fin aspect ratios, i.e. fishes believed to be capable
of lift-based swimming which often achieve high speeds. Overall, there was
a strong correlation between estimated swimming performance, as indicated
by fin aspect ratio, and degree of water movement. We propose that swimming
performance in fishes limits access to high-energy locations and may be a
significant factor influencing habitat use and regional biogeography of ree
f fishes.