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A process for comparing and interpreting differences in two benthic indices in New York Harbor.

Sandra J Benyi¹, Jeffrey W Hollister, John A Kiddon

¹US Environmental Protection Agency, Office of Research and Development, National Health and Environmental Effects Research Laboratory, Atlantic Ecology Division, Narragansett, RI 02882, United States. benyi.sandra@epa.gov

Marine Pollution Bulletin

|December 27, 2008

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When estuarine benthic indices differ, they reveal distinct ecological aspects. This study developed a method to compare indices, finding the New York Harbor index strongly correlates with sediment contamination and grain size.

Area of Science:

Estuarine Ecology
Environmental Monitoring
Benthic Ecology

Background:

Benthic indices are crucial for assessing estuarine health but can yield conflicting results.
Discrepancies often arise because indices measure different facets of benthic condition.
Understanding these differences is key to accurate environmental assessment.

Purpose of the Study:

To develop and apply a process for screening and evaluating estuarine benthic indices.
To compare the US EPA Environmental Monitoring and Assessment Program's Virginian Province index with the New York Harbor index of biotic integrity.
To assess index agreement and their associations with habitat and sediment contamination.

Main Methods:

Utilized radar plots for multi-metric visualization.

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Employed conditional probability plots and receiver operating characteristic curves to evaluate associations.

Analyzed data from New York Harbor, comparing two specific benthic indices.

Main Results:

The two indices agreed in approximately 78% of cases.
The New York Harbor index demonstrated stronger associations with sediment metal contamination and grain size.
The study identified a systematic approach to reconcile differing index assessments.

Conclusions:

Different benthic indices capture unique aspects of estuarine condition.
The New York Harbor index is more sensitive to sediment contamination and physical characteristics.
The developed screening process aids in interpreting and integrating multiple benthic assessment tools.