Independence Lake Fisheries Research Challenges by liuhongmei

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									Independence Lake Preserve
           Public Input Process


We are seeking public input on recreation and
access management issues.
Variety of opportunities to provide direct feedback:
•Public Meetings
•Online Survey:
   –https://www.surveymonkey.com/s/ILP2011
•Focus Group Sessions
•Blog Website with comment options:
   –http://tncindependencelake.wordpress.com/
              Topic Stations


1) Aquatic Invasive Species/Lake Health
  – Educational Station
2) Watercraft Options
  – Input on the types of watercraft and related issues
3) Seasonal Recreation Activities
  – Input on other types of recreational activities
4) General Issues/Map of the property
  – Input on all other issues not covered by the other topic
    stations
              Introduction: The Independence Lake Preserve
              and Aquatic Invasive Species Information

Kathryn Landreth, Nevada State Director for The
Nature Conservancy, will provide an introduction
about the acquisition of the property around
Independence Lake and the Conservancy’s goals.

David Kean, Program Coordinator for the Truckee
Regional AIS Prevention Program will now do a brief
presentation on the issue of aquatic invasive species
(AIS) and the relevance of this issue to Independence
Lake.
The Property
               Why The Nature Conservancy is Here


 Mountain lake
  ecosystem

 Lahontan cutthroat trout

 Lahontan native fish
   assemblage-

   •   Lahontan lake tui chub
   •   Paiute sculpin
   •   Mountain whitefish
   •   Speckled dace
   •   Lahontan redside
   •   Tahoe sucker
Old Growth Conifers, Aspen Groves, Wet
Meadows
Recreation
Forest Restoration
              Management Goals for the Independence Lake
              Preserve

 Support public and private agency partners with
  restoration of native fish and the Lahontan cutthroat trout
  population.

 Prevent aquatic invasive species introduction to
  Independence Lake.

 Restore a healthy forest system, and reduce threat of
  catastrophic wildfire.

 Provide public access for recreation compatible with
  protection of the ecology of the watershed that is cost-
  effective and administratively feasible.
            Science and Managing Partners


•   California Department of Fish and Game
•   Northern Sierra Partnership
•   Truckee Donner Land Trust
•   Truckee Meadows Water Authority
•   Truckee River Watershed Council
•   U.S. Fish and Wildlife Service
•   U.S. Forest Service
•   U.S. Geological Survey
              Property Acquisition Budget


U.S. Bureau of Reclamation:        $6,594,028

CA Wildlife Conservation Board     $5,500,000

CA Resources Agency:               $1,310,294

Sierra Nevada Conservancy:         $1,000,000

Northern Sierra Partnership:       $ 495,678

Private donation:                  $ 100,000
                   Why did Public & Private Sources Fund this
                   Acquisition?


Bureau of Reclamation: “For the acquisition of land surrounding
Independence Lake and protection of the native fishery and water quality of
Independence Lake.”($6 million)
CA Wildlife Conservation Board: “The Property shall be held and used for
the purposes of acquisition and protection of habitat that promotes the
recovery of threatened and endangered species, that provides corridors for
linking separate habitat areas to prevent habitat fragmentation and that
protects significant natural landscapes and ecosystems.” ($5.5 million)
CA Resources Agency: “For the purpose of protecting this pristine
watershed which surrounds Independence Lake and straddles
approximately 3.5 miles of Independence Creek. The Grant Funds will be
used to acquire the property along Independence Creek and surrounding
Independence Lake and to allow open space for low-impact recreational
uses.” ($1.3 million)
                         Didymosphenia geminata
                         A diatom that grows in
                         shallow water. Easily
                         transmitted by fishing
                         equipment.




Aquatic Invasive Species
Why are some species invasive, where are they
presently, how do they move into new lakes, and, why
are they damaging both economically and
environmentally?
Common Attributes of Invasives
* Reproduce rapidly and reach high densities
* Have few or no predators, also, no native disease
* Voracious users of resources (phytoplankton, DO
  and CO2)
* Nitrogen byproducts can lead to Algal blooms
* Impact economics-can increase the cost of utilities
  such as electric and water
* Impact the ecosystem by disturbing food webs and
  changing water chemistry
* Impact recreation
* Food web disruptions can cause native fish decline
Watercraft and Equipment
as Transmission Vectors
 “…bombardment of every country by foreign species,
  brought accidentally or on purpose, by vessel and by
  air and also overland from that used to be isolated…”
  ‐Charles Elton 1958-Population Biologist
 Long distance dispersal events greatly increase the
  speed of invasions and the expansion of ranges
 Known dispersal vectors, boats (recreational, commercial),
  fishing equipment (creels, boots, lures), waterway connections
  (rivers, canals, currents), aquarium or ornamental release
 Recreational boaters are willing to travel for a variety of
  reasons to use waterways including distance, amenities and
  resource quality
 A precautionary approach toward invasive management and
  prevention of introduction provides the highest
  probability of delaying or avoiding an introduction of AIS
    Marion Whittmann, UC Davis, Recreational Boater Movement in California and Nevada and Implications
    for Dreissenid Mussel Introduction to Inland Water Bodies
Zebra & Quagga Mussels
Originated in Europe
No natural predators in
 the US
Have threads that allow
 them to attach to
 infrastructure
No native mussels have
 threads
Can produce 1 million
 juveniles per year
Juveniles are
 microscopic
High Densities
Asian Clam
 Present in Lake Tahoe and Donner Lake
 Has the highest metabolism of all mollusks-disrupts food
  web
 Hermaphroditic
 Can Produce 100,000 juveniles/year
 Juveniles are microscopic
 No natural predators in US
 Control program in Tahoe
 Spread throughout Texas rapidly
 Reach extremely high densities
Eurasian Watermilfoil
Extensive local populations in
 Tahoe, Martis, & TR
Reproduces vegetatively by
 fragmentation
Dispersed by boats, trailers,
 motors
Spreads quickly, reduces light
 penetration
Water Chemistry
Greatly changes habitat,
 predator-prey relationships, and
 reduces nutrient rich plants
 needed for waterfowl
Didymosphenia geminata
Common name-
 Rock Snot
Grows in shallow water
Easily transmitted by
 fishing gear
Reproduces vegetatively
Uses stalks to attach to
 surfaces
Impacts recreation
Curly Leaf Pondweed
Presently in Tahoe
Reproduces by turions
 (burr like winter buds)
Found in all states except
 Maine
New plants can form under
 ice
Die off in mid-summer
Decaying plants decrease
 DO and can increase algae
The water equivalent of
 cheat grass
Hydrilla
 Can drive out all native
  plants
 Needs very little light
 Photosynthesizes in
  early morning
 Depletes CO2
 Can double biomass in
  two weeks
 At night uses
  dissolved oxygen
 Decreases in DO can
  kill fish
 Reproduces with
  turions
New Zealand Mudsnail
                                  NZMS are tiny
 Is asexual-only takes one
 Easily transported by fishing
  equipment
 Presently in Sacramento and
  American Rivers
 Reaches extremely high
  densities
 500,000/sq. yard
 Can survive for days out of
  water
 Eat algae
 Compete with native bottom
  dwellers
               Topic Station Break-Outs

Please go to the Topic Stations now to provide
   direct feedback.
1) Aquatic Invasive Species/Lake Health
  – Educational Station
2) Watercraft Options
  – Input on the types of watercraft and related issues
3) Seasonal Recreation Activities
  – Input on other types of recreational activities
4) General Issues/Map of the property
  – Input on all other issues not covered by the other topic
    stations
            Wrap-Up

Thank you for your input and feedback about this
important area. If you have further public
  comment,
please complete the online survey or submit your
comments on the blog website.
https://www.surveymonkey.com/s/ILP2011
http://tncindependencelake.wordpress.com/

								
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