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Seagrass beds of the Florida Keys National Marine Sanctuary (FKNMS) have global renown, yet their fish populations require study. A 24-mo trawl survey determined that Haemulon plumierii (Lacépède, 1801), Lagodon rhomboides (Linnaeus, 1766), Monacanthus
ciliatus (Mitchill, 1818), and Eucinostomus spp. constituted nearly 70% of small-bodied fishes in FKNMS seagrasses. Mean abundance and species richness were significantly higher in areas containing larger, denser, and more structurally complex seagrass beds on the gulf of Mexico
side, especially in the middle and lower Keys, than in the sparser and less complex Atlantic seagrass beds, which are much closer to the Florida reef tract. There was limited seasonal variation in fish-assemblage composition. Abiotic factors (water temperature, salinity, and dissolved oxygen)
appeared less important in defining assemblages than biotic characteristics (i.e., seagrass structure). The only prevalent, economically important reef-associated fishes using the seagrass beds as nurseries were H. plumierii, Lutjanus synagris (Linnaeus, 1758), and Lachnolaimus
maximus (Walbaum, 1792). Many coral-reef-associated families were absent and most members of the locally important snapper-grouper complex (Lutjanidae and Serranidae) were captured infrequently. This may be attributable to distance from the reefs and also because some of these species
inhabit seagrasses nocturnally and so were not collected by the diurnal trawling.
The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.