TY - JOUR
T1 - Foraminiferal Assemblages in Biscayne Bay, Florida, USA: Responses to Urban and Agricultural Influence in a Subtropical Estuary
AU - Carnahan, Elizabeth A.
AU - Hoare, A. M.
AU - Hallock, Pamela
AU - Lidz, Barbara H.
AU - Reich, Christopher D.
AU - Muller, Pamela Hallock
PY - 2009/1/1
Y1 - 2009/1/1
N2 - 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.
AB - 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.
KW - ammonia
KW - archaias
KW - eutrophication
KW - foram index
KW - heavy metals
KW - hypoxia
UR - https://digitalcommons.usf.edu/msc_facpub/936
UR - https://doi.org/10.1016/j.marpolbul.2009.08.008
U2 - 10.1016/j.marpolbul.2009.08.008
DO - 10.1016/j.marpolbul.2009.08.008
M3 - Article
C2 - 19744675
VL - 59
JO - Marine Pollution Bulletin
JF - Marine Pollution Bulletin
ER -