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The Barnacle, Balanus subalbidus, as a Salinity Bioindicator in the Oligohaline Estuarine Zone

Michael A. Poirrier and Mickel Ray Partridge
Estuaries
Vol. 2, No. 3 (Sep., 1979), pp. 204-206
Stable URL: http://www.jstor.org/stable/1351738
Page Count: 3
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Barnacle, Balanus subalbidus, as a Salinity Bioindicator in the Oligohaline Estuarine Zone
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Abstract

The distribution and size of the barnacle Balanus subalbidus were studied along salinity gradients in coastal Louisiana and Mississippi. It was common in gradient estuaries occurring in salinities ranging from near fresh water to 16 ppt. It was the dominant barnacle species in the oligohaline zone, but at salinities above 6 ppt its relative abundance decreased and it was replaced by B. improvisus and B. eburneus. Its low-salinity limit corresponded to the boundary between the oligohaline and fresh water estuarine salinity zones and there was a high negative correlation between size (basal rostral-carinal diameter) and salinity. Its size and distribution could be used to determine prevailing salinity at a site because of its abundance and uniform distribution in oligohaline areas.

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