Status and future directions of the Devils Hole Pupfish
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1 Status and future directions of the Devils Hole Pupfish M. Schwemm, K. Wilson, O. Feuerbacher, A. Chaudoin, J. Wullschleger, C. Lee, J. Goldstein, J. Linares- Casenave, B. Senger NWFCC Redding, California 5-7 Dec 2017
2 Acknowledgments Death Valley National Park-National Park Service Ecological Services-US Fish and Wildlife Service Fisheries and Aquatic Conservation-US Fish and Wildlife Ash Meadows National Wildlife Refuge-US Fish and Wildlife Water Resources Division, Fisheries-National Park Service Fisheries Division-Nevada Department of Wildlife
3 Devils Hole pupfish (overview) Species description Location Natural history Conservation concern Current habitats Conditions (natural and artificial) Update the abundance for 2017 Devils Hole (Death Valley National Park) Fish Conservation Facility (USFWS) Future management
4 Location- Devils Hole
5 Devils Hole pupfish Natural history and conservation Cyprinodon diabolis (Cyprinodontidae) Approximately 25 mm (TL) Mature, < 3 months; Lifespan, 9-12 mo.) Single natural habitat (~ 2 x 6 m) Cyprinodon diabolis; Wales 1930 Conservation Protected 1967 (USFWS) Endangered Species Preservation Act Documented history of management since 1970s Species jointly managed by NPS, USFWS, NDOW Symbol of aquatic conservation
6 Federal Protection Groundwater Pumping s Landmark Supreme Court case Cappaert v. United States 1976 Maintain water level in Devils Hole Intensive management Grapevine Springs (1972)
7 Devils Hole Conditions Submerged limestone cavern Warm! o C (93 o F) Low dissolved oxygen: mg/l ph: ~7.4 Energy limited system Fluctuations over shelf
8 km SW of Pijijiapan, MX 7 Sept Sept. 2017
9 Devils Hole Pupfish Counts Fish estimated semi-annually since 1970s Spring and fall Direct count (avg. of first count on consecutive days) Established protocol (4 levels + surface) 2017 Fall Count (September) 115 fish 20% decrease from fall 2016 Lower, but not remarkable Relative to inter-annual variation Record lows of 38 (2006) and 35 (2013)
10 Relative Abundance 600 Fall (September or October) Devils Hole Devils Hole Pupfish Population Spring (March or April) 0 Year
11 Relative Abundance Fall (September or October) Devils Hole Devils Hole Pupfish Population Hypotheses Food resources? Predation? Community structure? Climate Change? Inbreeding? Disease? Water Quality? Spring (March or April) 0 Year
12 Relative Abundance 600 Fall (September or October) Devils Hole Devils Hole Pupfish Population Spring (March or April) 0 Year
13 Past Artificial Refuge Populations Hoover Dam (1972) School Springs (1980) Point of Rocks (1990)
14 Ash Meadows Fish Conservation Facility
15 Ash Meadows Fish Conservation Facility (AMFCF) Indoor facility 2013 Aquaria for early life stage 110,000 gal. Refuge Tank (RT) replicate conditions from wild Devils Hole light conditions Temperature: 2 than DH Feeding 2-3x weekly High protein > egg production Antibiotic used > high survival Grows fertilized eggs from DH Released to RT as adults
16 2017 Abundance AMFCF 2017 Total Fish: 92 fish 85 Adult Fish Refuge Tank 7 ongoing breeding experiment Refuge Tank (RT): Reproduction? All life stages evident Eggs to adults (F2 adults) Sampling reveals many non-viable eggs Almost all animals in RT from Devils Hole Husbandry success: 50% eggs from Devils Hole viable > 80% hatch and survive to 15 d 80% of larvae to adults Lifespan 2-3 yrs (vs mo. in Devils Hole)
17 Abundance of Devils Hole pupfish Devils Hole (wild) pupfish abundance at 115 animals Relative stability at +/- 100 for 11 years (ex. 2013) Typical healthy looking fish Refuge population abundance +/- 92 fish Little evidence of substantial recruitment Refuge Tank abundance due to lifespan in moderated conditions Abundance in Devils Hole post 2013 was not impacted by removing 0-10 eggs/month for the Refuge Tank
18 How secure is the Devils Hole pupfish? 200, 400, 800 One population, two population.
19 Future the Devils Hole pupfish? Low recruitment DH (and very, very low RT) Period of stable is atypical Evaluate hypotheses Dytiscids in RT Ostracods in DH not historic Predation by DHP Synergistic effects Strategic planning Develop contingencies Increase research activities Genetic diversity in RT vs DH Hypotheses Food resources? Predation? Community structure? Climate Change? Inbreeding? Disease? Water Quality?
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