Pelagic Organism Decline Overview

The Interagency Ecological Program (IEP), a consortium of nine state and federal agencies, has been monitoring aquatic organisms and water quality in the San Francisco estuary for decades. Since late 2004, scientific and public attention has focused on the unexpected decline of several pelagic (open-water) fishes (delta smelt, longfin smelt, juvenile striped bass, and threadfin shad) in the freshwater portion of the estuary known as the Delta. This decline has collectively become known as the Pelagic Organism Decline (POD). In 2005, the IEP formed a multi-agency POD Management Team tasked with designing and managing a comprehensive study to evaluate the causes of the decline and to synthesize and report the results. The causes under investigation include stock-recruitment effects, a decline in habitat quality; increased mortality rates; and reduced food availability due to invasive species.



CALFED Science Program POD Support

The Science Program has made concerted efforts to help support the IEP Pelagic Organism Decline effort. While not an official member of the IEP, the Science program has contributed Independent Science Reviews, documents, and financial support in an effort to identify the source(s) that are contributing to the decline of pelagic organisms in the Bay-Delta Region.

Science Program funded POD focused PSP's

#0106
Life cycle models and population biology of key species, environmental influences on key species and ecosystems , relative stresses on key fish species, direct and indirect effects of diversions on at-risk species.

Paap, Kenneth
kenp@sfsu.edu
(415) 338-7091

Kimmerer, Wim J.
kimmerer@sfsu.edu
415 338 3515
510 555 1212

#0107
Environmental influences on key species and ecosystems , relative stresses on key fish species, Delta smelt-related projects.

Paap, Kenneth
kenp@sfsu.edu
(415) 338-7091

Kimmerer, Wim J.
kimmerer@sfsu.edu
415 338 3515
510 555 1212

#0122
Environmental influences on key species and ecosystems , relative stresses on key fish species, processes controlling Delta water quality.

Lehman, Peggy W., PhD
plehman@water.ca.gov
916-227-7551
916-715-0845

Supporting Documents