2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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5/21/2018  |   12:00 PM - 12:15 PM   |  INTERMITTENT AND PERENNIAL STREAM MACROINVERTEBRATE COMMUNITY RESPONSE TO IMPERVIOUS COVER: THRESHOLD INDICATOR TAXA ANALYSIS AND PERMUTATIONS   |  310 A

INTERMITTENT AND PERENNIAL STREAM MACROINVERTEBRATE COMMUNITY RESPONSE TO IMPERVIOUS COVER: THRESHOLD INDICATOR TAXA ANALYSIS AND PERMUTATIONS

The urban stream syndrome and the impact of impervious cover on macroinvertebrate communities is well-documented, but many exclude intermittent streams despite their prevalence. This study investigated macroinvertebrate communities of intermittent and perennial streams separately in the South Coast and Chaparral regions of California, USA. Macroinvertebrate data from Southern California Coastal Water Research Project and California Environmental Data Exchange Network were used in Threshold Indicator Taxa Analysis (TITAN) to determine macroinvertebrate community’s ecological thresholds and responses to impervious cover across the urban gradient. In a new approach to TITAN, statistical differences in thresholds along impervious cover gradients were determined by permuting observations 1) between intermittent and perennial streams, 2) during different weather regimes described by Palmar Drought Severity Index, 3) between Chaparral and South Coast regions, both with Mediterranean climates, and 4) before and after implementation of the 2010 General Construction Permit in California that developed more stringent stormwater regulations for construction projects. Preliminary results indicated low ecological thresholds (<1% impervious cover) for both intermittent and perennial streams. Results from this study will be used to quantify the ecological influence of the California 2010 General Construction permit with future sampling.

  • Invertebrate
  • Intermittent
  • Watershed

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Presenters/Authors

Stephanie Figary (), ORISE Research Participant at the USEPA EPA/ORD/NHEERL Atlantic Ecology Division, figary.stephanie@epa.gov;


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Naomi Detenbeck (), U.S. EPA/ORD/NHEERL Atlantic Ecology Division, Detenbeck.Naomi@epa.gov;


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