Delta Inter-agency Invasive Species Coordination (DIISC) Team

Delta Invasive Species Symposium at UC Davis Conference Center Occurred on August 29, 2017 (9:00-4:30)

Tools and Actions to Meet Current Needs and Prepare for Future Challenges

This one-day science symposium on Invasive Species at U.C. Davis August 29 was co-sponsored by the Delta Interagency Invasive Species Coordination (DIISC) Team, Delta Stewardship Council’s Delta Science Program, and UC Davis.

Presentations explored tools and actions being developed to meet today’s management needs as well as to prepare for future challenges. The seminar also explored our understanding of how habitats can be managed to encourage native and deter invasive species and how social science can be better integrated into invasive species management.

Videos of the 2017 Symposium presentations are available through UC Davis here.


9:00-9:15            Welcome and introductions

9:15-11:35          Tools and techniques for management of current and future invasions

  • Predictive tools and methods for invasion risk for aquatic species – Catherine Jarnevich, USGS
  • Prioritizing Prevention Efforts for Invasive Dreissenid Mussels – Rachael Klopfenstein, CDFW
  • Integrating eDNA and Occupancy Modeling to Estimate the Distribution of Non-Native Watersnakes: Lessons Learned – Jonathan Rose, UC Davis
  • Predictive mapping in pest risk analysis – Glenn Fowler, USDA-APHIS
  • Assessing Risk and Mapping Distribution for Invasive Plants: Cal-IPC’s Inventory and CalWeedMapper Decision-Support Tools – Ramona Robison, Cal-IPC

11:35-12:00        Program updates: Brief lightning talks providing updates on various invasive species, programs, and projects in the Delta

12:00-1:20          Poster session and lunch break

1:20-3:15            Managing habitat conditions to shift non-natives to natives

  • Space Invaders:  The Challenge of Alien Fishes in the Bay-Delta – Ted Sommer, DWR
  • Invasive fish species and salmon predation in the Delta – Brendan Lehman, NOAA SFCS
  • Waxing and waning of invasive aquatic vegetation with annual variability in California weather – Shruti Khanna, CDFW and UC Davis
  • Human component of implementing control in Lake Tahoe – Lars Anderson, USDA-ARS (retired)

3:15-4:25            Panel discussion: The human dimension of invasive species management

4:25-4:30           Wrap up and adjourn

DIISC Team Purpose

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, with involvement from key Federal agencies.

DIISC Team Activities

  • Develop and implement actions to improve communication among California land and water resource managers, regulators, and stakeholders involved in invasive species management in the Delta, including scientific symposia; technical, regulatory, and other agency updates at quarterly meetings; and outreach activities.
    • 2015 Symposium on Invasive Aquatic Vegetation.
    • Invasive aquatic vegetation synthesis paper (Ta et al., 2017, in review, SFEWS).
    • 2017 symposium on invasive species in the Delta.
      • August 29th Delta Invasive Species Symposium at UC Davis
    • Quarterly DIISC team meetings with participants. Contact Maggie Christman, Delta Science Program for information on upcoming meetings.
  • Collaborate on outreach opportunities to the public to prevent introduction or transport of invasive species.
  • Develop and implement actions to increase support for invasive species knowledge and management in the Delta, including writing and submission of interagency Proposition 1 and other grant proposals, and keeping agencies informed about their grant opportunities.
    • Completed a prioritized table of research needs.
    • Developed three proposals for highest priority projects and submitted to CDFW and the Delta Conservancy Proposition 1 Grant Programs. The Delta Conservancy conditionally approved funding for the Investigations of restoration techniques that limit invasion of tidal wetlands in April 2017.
    • Collaborated with participants that own land within the Sacramento-San Joaquin Delta to identify additional release sites for U.S. Department of Agriculture-Agricultural Research Service Arundo biocontrol agents.

DIISC Team Participants

Examples of invasive species of concern for the Delta (copied with permission from USDA-ARS DRAAWP and CDFW Invasive Species)

Brazilian Egeria

Egeria densa

(Photo by Jack Kelly. © 2005 UC Regents)

Curlyleaf pondweed

Potamogeton crispis

(Photo from DiTomaso et al., 2013)

New Zealand mudsnails

Potamopyrgus antipodarum

(Photo by U.S. Geological Survey; dime for size reference.)

Giant reed

Arundo donax 

(Photo from DiTomaso et al., 2013)

South AmericanSpongeplant

Limnobium laevigatum

(Photo from DiTomaso et al., 2013)

Chinese mitten crab

Eriocheir sinensi

(Photo by CDFW)

Water hyacinth

Eichhornia crassipes

(Photo from DiTomaso et al., 2013)


Ludwigia spp.

(Photo from DiTomaso et al., 2013)


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