Foraminiferal assemblages in Biscayne Bay, Florida, USA: Responses to urban and agricultural influence in a subtropical estuary

Carnahan, E. A.; Hoare, A. M.; Hallock, P.; Lidz, B. H.; Reich, C. D.

Abstract:

This study assessed foraminiferal assemblages in Biscayne Bay, Florida, a heavily utilized estuary, interpreting changes over the past 65 years and providing a baseline for future comparisons. Analyses of foraminiferal data at the genus level revealed three distinct biotopes. The assemblage from the northern bay was characterized by stress-tolerant taxa, especially Ammonia, present in low abundances (???2.0 ?? 10³ foraminifers/gram) though relatively high diversity (???19 genera/sample). The southwestern margin of the bay was dominated by Ammonia and Quinqueloculina, an assemblage characterized by the lowest diversities (???12 genera/sample) and highest abundances (???1.1 ?? 10⁴ foraminifers/gram), influenced by both reduced salinity and elevated organic-carbon concentrations. A diverse assemblage of smaller miliolids and rotaliids (???26 genera/sample) characterized the open-bay assemblage, which also had a significant component (???10%) of taxa that host algal endosymbionts. In the past 65 years, populations of symbiont-bearing taxa, which are indicators of normal-marine conditions, have decreased while stress-tolerant taxa, especially Ammonia spp., have increased in predominance. ?? 2009 Elsevier Ltd.

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Article

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70036802

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Carnahan, E. A.; Hoare, A. M.; Hallock, P.; Lidz, B. H.; Reich, C. D.

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233

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8-12

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English

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Marine Pollution Bulletin

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Foraminiferal assemblages in Biscayne Bay, Florida, USA: Responses to urban and agricultural influence in a subtropical estuary; 2009; Article; Journal; Marine Pollution Bulletin; Carnahan, E. A.; Hoare, A. M.; Hallock, P.; Lidz, B. H.; Reich, C. D.