About the Delta Interagency Invasive Species Coordination (DIISC) Team


The DIISC Team was formed in 2013 to foster communication and collaboration among California state agencies that detect, prevent, and manage invasive species and restore invaded habitats in the Sacramento-San Joaquin Delta.  The DIISC Team includes state agency program managers and scientists, and benefits from participation by research and conservation groups and other stakeholders. The DIISC Team also has involvement from key Federal agencies.

As outlined in the Invasive Species Coordination Framework, the goals of the DIISC Team are to establish a framework for:

  • Strategic planning
  • Coordinated implementation
  • Education and outreach
  • Data management
  • Research needs
  • Funding

Click here to view the Invasive Species Coordination Framework draft from January 2015 (PDF file)


Invasive species are nonnative species whose introduction causes or is likely to cause harm to economies, environment or human health.  The Delta is among the world’s estuaries most-invaded by nonnative species.  At least 185 nonnative species are currently present and new species will likely arrive.

The many historical changes to the Delta have made the area more hospitable to certain nonnative species. These factors include changes in the timing and volume of flows, salinity levels and other water quality indicators, and reduction and shifting of habitat. Climate change is also expected to favor nonnative species over natives.

Although many nonnative species will likely remain in the Delta, harmful ecological, economic, and human health impacts from invasive species can be minimized by preventing new introductions and controlling existing ones. Since there is no singular lead entity for managing invasive species in the Delta, the DIISC Team provides a needed forum for the agency collaboration and communication that is essential to preventing and controlling the negative impacts of invasive species.


The DIISC Team meets quarterly. Contact Thomas Jabusch at the Delta Conservancy for information on upcoming meetings. 

Invasive Animal Species in the Delta

Chinese mitten crab - Eriocheir sinensi
Chinese mitten crab – Eriocheir sinensi
(Photo by CDFW)
New Zealand mudsnails - Potamopyrgus antipodarum
New Zealand mudsnails – Potamopyrgus antipodarum
(Photo by U.S. Geological Survey)
Northern Watersnake - Nerodia sipedon
Northern watersnake – Nerodia sipedon
(Photo by Patrick Coin)
Nutria - Myocastor coypus
Nutria – Myocastor coypus
(Photo by CDFW)
Quagga Mussels - Dreissena rostriformis bugensis
Quagga mussels – Dreissena rostriformis bugensis
(Photo by CDFW)
Southern Watersnake - Nerodia fasciata
Southern watersnake – Nerodia fasciata
(Photo by CDFW)
Zebra mussels – Dreissena polymorpha
Zebra mussels – Dreissena polymorpha

Invasive Plant Species in the Delta

Alligatorweed - Alternathera philoxeroides
Alligatorweed – Alternathera philoxeroides
(Photo by National Plant Data Center, Baton Rouge, LA)
Brazilian egeria – Egeria densa
Brazilian egeria – Egeria densa
(Photo by Lara Gudmundsdottir)
Common Reed - Phragmites australis subsp. australis
Common reed – Phragmites australis subsp. australis
(Photo by Erlend Bjortvedt)
Curlyleaf pondweed – Potamogeton crispis
Curlyleaf pondweed – Potamogeton crispis
(Photo by Christian Fischer)
Eurasian watermilfoil – Myriophyllum spicatum
Eurasian watermilfoil – Myriophyllum spicatum
(Photo by Fungus Guy)
Giant reed – Arundo donax
Giant reed – Arundo donax
Perennial Pepperweed - Lepidium latifolium
Perennial pepperweed – Lepidium latifolium
(Photo by Leslie J. Mehrhoff, University of Connecticut, Bugwood.org)
Purple Loosestrife - Lythrum salicaria
Purple loosestrife – Lythrum salicaria
(Photo by Liz West)
South American spongeplant – Limnobium laevigatum
South American spongeplant – Limnobium laevigatum
(Photo by Cardex)
Water hyacinth - Eichhornia crassipes
Water hyacinth – Eichhornia crassipes
(Photo by Wouter Hagens)
Waterprimroses – Ludwigia spp.
Water primrose – Ludwigia spp.
(Photo by Bouba)

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