Download - Implications for the future

Transcript
Page 1: Implications for the future

Life history characteristics and habitat selection of ‘Opae kala’ole

over a strong precipitation gradient

Implications for the future

Ralph W. Tingley III1, Richard MacKenzie2, Dana M. Infante1, Ayron M. Strauch3

1 Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI2 Institute of Pacific Island Forestry, Pacific Southwest Research Station, Hilo, HI

3 University of Hawaii, Manoa, HI

Page 2: Implications for the future

Climate change may lead to decreased flow in Hawai’i’s freshwater streams Increase in air temperature, amplified at high

elevations (Giambelluca 2008) Changes or shifts in annual precipitation Expansion of strawberry guava

USGS has shown a 10% decrease in stream flow over the last 30 years (Oki 2003)

How might these changes impact stream biota? How can we study this impact?

Climate change and Hawai’i’s freshwater systems

Page 3: Implications for the future

Space for time: Differences across a precipitation gradient

Unique and extreme gradient in precipitation

Similar landscape and land cover characteristics

Page 4: Implications for the future

Why focus on shrimp? Keystone species Culturally important Opportunity to gain

knowledge on life history

Does variation in annual precipitation alter life history characteristics, abundance and habitat selection?

‘Opae kala’ole in a changing world

Growth rate Secondary

production Fecundity Habitat selection Abundance

hawaii.edu/hsrc/home/timbolsv.htm

Page 5: Implications for the future

1. Production and growth rate Capture-mark-recapture

2. Fecundity # gravid females and weight

3. Abundance/habitat selection Random 1 m2 visual estimates Stratified by habitat type

Sampling methods

hbs.bishopmuseum.org/waipio/Critter%20pages/atyoida.html

Page 6: Implications for the future

Anticipated results

Growth rate Secondary production Gravid females Individual fecundity

In streams with less precipitation (i.e. flow):

Pool occupancy Density

hawaii.gov/dlnr/dar/streams_native_animals.html

Page 7: Implications for the future

Benefits and applications Immediate applications

Better understanding of life history characteristics

Insight into habitat selection of freshwater shrimp throughout the tropics

Define in-stream flow thresholds Web-based management tool

Future directions Use results and climate change projections to

predict distribution and abundance changes Explore relationships between abundance

and land cover

Page 8: Implications for the future

Acknowledgements

Dr. Christian Giardina, Dr. Gordon Smith, Dr. Robert Nishimoto, Dr. Greg Bruland

Tara Holitzki USDA Forest Service Division of Aquatic Resources HFHP Partnership University of Hawai’i at Manoa Kamehameha Schools Michigan Sate University USGS

Page 9: Implications for the future

Mahalo!