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Richard V. Lacouture Morgan State University Estuarine Research Center

The Use of an Index of Biotic Integrity to Assess Phytoplankton Habitat Conditions in Chesapeake Bay. Richard V. Lacouture Morgan State University Estuarine Research Center. The Phytoplankton Index of Biotic Integrity.

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Richard V. Lacouture Morgan State University Estuarine Research Center

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  1. The Use of an Index of Biotic Integrity to Assess Phytoplankton Habitat Conditions in Chesapeake Bay Richard V. Lacouture Morgan State University Estuarine Research Center

  2. The Phytoplankton Index of Biotic Integrity • The PIBI is a set of metrics (12) established for specific assemblage of organisms which describes habitat conditions for that assemblage • Reference and degraded habitat conditions were classified (DIN, PO4, light) • Metrics were selected based upon their power to discriminate (Kruskal-Wallis Chi-squared and Wilcoxon tests) the correct habitat conditions • Scoring criteria were established from metric thresholds based on the distribution of each metric in the reference community • A scoring system of 1-3-5 is used for all metrics such that a score of 1 reflects impaired conditions and a score of 5 indicates conditions within the ‘desirable’ half (50%) of the reference distribution • The scores are totaled and averaged for a specific site and season • The PIBI was validated by applying it to an independent data set

  3. Parameters Selected for PIBI - Spring

  4. Parameters Selected for PIBI - Summer

  5. Meets Expectations Establishing Metric Scoring Thresholds

  6. Validation - Overall Classification Efficiencies This was run on 2003 Monitoring data and 1998-2002 Pfiesteria Monitoring data

  7. Seasonal Kendall Linear Trend Analysis of Spring/Summer Mean PIBI Values 1985-2006 SIGNIFICANT TREND = p < 0.05

  8. Incorporating the PIBI into an Overall Index of Bay Habitat Health (BHHI) • 6 parameters have been selected for this BHHI - 3 water quality parameters – chlorophyll a, water clarity (secchi) and dissolved oxygen - 3 biotic parameters – PIBI, Benthic Index of Biotic Integrity and SAV coverage • A goal for each parameter was established • A measure of percent attainment (temporally and then areally weighted) of each parameter’s goal is used for the scoring system for the BHHI

  9. Temporal Percent Attainment of PIBI Goal

  10. Areally Weighted Percent Attainment of PIBI Goal

  11. Bay Health Index

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