The Belize Barrier Reef Reserve System (BBRRS) is the second largest reef system next to the Great Barrier Reef. Sediment composition and distribution across the reef environment correlates to extent of coral cover (Morgan, 2016). Analysis of coral debris can indicate previous wave induced forces, including hurricane action, and organismal response to proxy environmental conditions (Storlazzi et. al., 2004). The purpose of this research is to compare the origin and source distribution of sediments on the BBRRS through the analysis of biological contributors from the fore reef to the lagoon. Samples from four sites were collected by transecting reef zones off the coast of San Pedro, Belize. Sediment sizes at 50% of each sample show that the reef crest and back reef have the largest grain size, lagoon and channel are moderately sized, and the reef flat has the smallest grains, with biological components sorting by size. A modified method for determining carbonate composition of reef sediments to limit error in determination was evaluated (Ashworth, 1997). A pH assay to evaluate the rate at which the sediments dissolved in a pH range of 6.5 to 8.5 was performed (Kroeker, 2013). To asses the ratio of magnesium to calcium biomineralized as carbonates by reef organisms, the acid digested samples were selectively precipitated for gravimetric analysis (Irving, 1926). Results indicate the majority of samples are predominantly carbonate in composition and reflect the expected Mg2+/Ca2+ ratios expected from reef organisms (Clarke and Wheeler, 1922).

Sediment composition in the barrier reef system near San Pedro, Belize

2019 Spring National Meeting

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