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I compare the distribution and abundance of fishes between macroalga and seagrass habitats in Indian River lagoon, Florida. I sampled fishes monthly (Oct. 1986 Sept. 1987) for a year by placing seines 10 m apart and pulling them together. I used a 1 m2 throw net to sample during March, May, June, August and September 1987. There was no significant difference in temperature, salinity, dissolved oxygen, and pH between habitats. Water depth was significantly different between alga (mean = 0.80 m) and seagrass (mean = 0.52 m). Dominate species (Lucania parva, Menidia peninsu/ae, Gobiosoma robustum, Syngnathus scovelli, Microgobius gu/osus, Eucinostomus /efroyi, Floridichthys carpio, and Strongy/ura notata) were similar between the two habitats. Mean abundance, biomass, juvenile abundance and richness per seine tow; and abundance and biomass per throw net throw were significantly greater for sea grass habitat (p ~0.05). Multiple regression analysis indicated that habitat type accounted for the majority of the variation in abundance (37%) and biomass of fishes (31 %) collected. Vegetation biomass, dissolved oxygen, pH, salinity, temperature, and water depth accounted for smaller amounts ( ~10%) of variation in abundance and biomass of fishes. MMy studies of fishes associated with macrophyte habitats have concentrated on describing and quantifying fishes associated with seagrass habitat (Heese and Jones 1963, Briggs and O'Connor 1971, Gilmore 1977, Schooley 1977, Orth and Heck 1980, Martin and Cooper 1981, Livingston 1982, Stoner 1983, Sogard eta/. 1987, Heck eta/. 1989, Sogard et a/. 1989a, 1989b). Briggs and O'Connor (1971) and Heck et a/. (1889) compared fishes occurring over naturally vegetated and sand/mud bottoms and Martin and Cooper (1981) and Stoner (1983) compared fishes found in pure stand of different seagrass species. These descriptive and comparative studies reveal the abundance and diversity of fishes occurring in seagrass habitats. In contrast to seagrasses, the macroalgae habitats of shallow water estuaries have received little attention. 'Present address: Institute of Ecology, Ecology Building, University of Georgia, Athen, GA 30602 119 These habitats often account for large portions of the submerged aquatic vegetation in lagoon systems of Florida (Thompson 1978, Benz eta/. 1979, White and Snodgrass 1990). Macroalgae habitats have both an attached and a drifting component (Dawes 1985). Both attached and drifting macroalgae are found interspersed among seagrasses or as large aggregations removed from or adjacent to seagrasses (Thompson 1978, White and Snodgrass 1990). Kulczycki et a/. (1981) studied fish abundance in relationship to drift algae in a seagrass-drift algae community. Their study found a positive relationship between drift algae abundance and abundance of two fishes, Gobiosoma robustum and Syngnathus scovelli. However, studies of macrophyte habitats have not investigated the relationship of fishes to attached macroalgae. In this paper I describe the distribution and abundance of fishes in at1 Snodgrass: Comparison of Fishes Occurring in Alga and Seagrass Habitats on t Published by The Aquila Digital Community, 1991 120 Snodgrass, J. W. tached macroalgal habitat and compare them with nearby seagrass habitat in the Indian River lagoon, Florida. The wide distribution of the macroalgae, Caulerpa prolifera in Indian River lagoon during 1986 and 1987 allowed fishes occurring in near monospecific stands of the alga and the seagrass, Halodule wrightii to be collected and compared.

Comparison of Fishes Occurring in Alga and Seagrass Habitats on the East Coast of Florida