Breeding Phenology of the Foothill Yellowlegged Frogs 20042006

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Breeding Phenology of the Foothill Yellow-legged
Frogs 2004-2006

• Jamie Bettaso
• U. S. Fish Wildlife Service
• Hartwell H. Welsh, Jr. Don Ashton
• Redwood Sciences Lab, USFS

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Overview

• Animal and Life History
• Survey efforts 2004-2006
• Breeding Phenology 2006

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Foothill Yellow-legged Frog (Rana boylii) RABO
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Foothill Yellow-legged Frog Generalized Life
History
Mar Apr May Jun Jul Aug Sep Oct No
v Dec-Feb
Reproductive Success
Tadpole/Larva - Tadpole/Larval Development
and Metamorphosis to Sub-adult Frogs
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Float Surveys For Egg Masses
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15MAY 1890 cfs / 14.8 C
29JUNE 2970 cfs / 11.5 C
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15 MAY 1890 cfs / 14.8 C
29 JUNE 2970 cfs / 11.5 C
6 JUNE 12.4 C
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2006 Flows on MSTR SFTR
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Fate of the 2006 MSTR RABO Larvae
17 JULY 06 965 cfs
24 JULY 06 508 cfs
31 JULY 06 489 cfs
31 JULY 06 489 cfs
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Conclusions

• Water Temperature can influence Egg Deposition
• Timing of Flow releases can influence Egg
  Deposition
• Rate of Change in Flows may influence Egg
  Deposition
• Rate of Change can have an impact on Tadpole
  Survival

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Acknowledgements
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Acknowledgements

• TRRP USFWS for funding
• TMC SAB for support
• Tina Freeman (GIS) and Mike Cunanan (DB) from
  USFWS
• And the frogs and their F1 stages