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Apr 9, 2003 - analyses of the in situ community data show distinct differences in ... Analysis of diversity statistics r
NOVA SOUTHEASTERN UNIVERSITY OCEANOGRAPHIC CENTER

MACROBENTHIC SPATIAL PATTERNS AND COMMUNITY STRUCTURE ON THE BROWARD COUNTY, FLORIDA (USA) REEFS. By Ryan P. Moyer

SUBMITTED TO THE FACULTY OF NOVA SOUTHEASTERN UNIVERSITY OCEANOGRAPHIC CENTER IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE WITH SPECIALTY IN:

MARINE BIOLOGY

NOVA SOUTHEASTERN UNIVERSITY 9 APRIL 2003

MOYER, RYAN P. MarineBiology)

(M.S.,

MACROBENTHIC SPATIAL PATTERNS AND COMMUNITY STRUCTURE ON THE BROWARD COUNTY, FLORIDA (USA) REEFS (April 2003) Master’s Thesis at Nova Southeastern University, Oceanographic Center ABSTRACT: High latitude reef communities consisting of typical Caribbean fauna of variable composition and density exist on four parallel ridges at varying depths along the Broward County (FL, USA) coast. At least two of these ridges, at 7-13m and 15-30m depth, are drowned early Holocene coral reefs of 5 ky and 7 ky uncorrected radiocarbon age, respectively. Previous work has shown that the present reef communities growing on these ridges can be detected and mapped using acoustic remote sensing and has suggested that different benthic assemblages may exist between each of these reefs. In this study, in situ community data was taken in four corridors on each reef using fifty-meter line-intercept transects. Multidimensional scaling analyses of the in situ community data show distinct differences in benthic community structure across several spatial gradients within the county. This clustering agrees well with an acoustic data set, taken in the same four corridors along the Broward County coast. Analysis of diversity statistics revealed that whereas species diversity (H’) was consistent throughout the county, species richness (d) and eveness (J’) increased along a north-south gradient. Total scleractinian cover was generally low in all areas (

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