Abstract
Anthropogenic and biogenic hydrocarbons have been determined in approximately 160 sediments, organisms and water samples from Tampa Bay, Florida, a highly urbanized and industrialized subtropical estuary. Results are compared with data from a similar study in Charlotte Harbor, Florida, a relatively unimpacted estuary 93 km south of Tampa Bay. Sedimentary hydrocarbon concentrations in both summer (5–30 μg/g) and winter (0–5 μg/g) are similar in the two estuaries, although levels in both subtropical systems are generally much lower than in most temperate estuaries. We postulate that this difference is the result of both larger average grain size and higher annual temperatures in the subtropical estuaries. “Hot-spots” of localized anthropogenic inputs were observed in both subtropical systems but decreased rapidly both vertically and laterally in the sediments.
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