Impacts on the Green & Golden Bell Frog Prof Graham H. Pyke - - PowerPoint PPT Presentation

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Impacts on the Green & Golden Bell Frog Prof Graham H. Pyke - - PowerPoint PPT Presentation

Nov 22, 2023 128 likes •295 views

PWCS T4 project proposal: Impacts on the Green & Golden Bell Frog Prof Graham H. Pyke (UTS) Representing the NSW Frog & Tadpole Study Group Main points GGBF critically endangered, within NSW, within the Hunter region and at

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PWCS T4 project proposal: Impacts on the Green & Golden Bell Frog

Prof Graham H. Pyke (UTS) Representing the NSW Frog & Tadpole Study Group

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Main points

  • GGBF critically endangered, within NSW, within the

Hunter region and at Kooragang

  • Single highly-significant population of GGBFs on

Kooragang/ Ash islands; it needs to be managed as such

  • Assessing impacts of human activities on GGBF

populations rests on breeding habitat

  • T4 project will probably lead to population extinction;

‘death by several cuts’

  • Contribution of proposed offset area to GGBF

conservation is close to zero

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GGBF- Heading for extinction

  • Up to 1995
  • over 80% loss
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Green & Golden Bell Frog in NSW – 1995 to 2007

  • Populations

23% lost

  • Only about 40

populations remaining in 2007, out of thousands

  • More disappeared

since 2007

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GGBFs in Upper Hunter

  • 8 recorded

sites

  • Possibly all

gone

  • One site

uncertain

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GGBFs in Middle Hunter

  • 8

recorded sites

  • Probably

all gone

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GGBFs in Lower Hunter

  • Probably only

Kooragang/ Ash Island still extant

  • Sig population
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GGBFs on Kooragang/ Ash Island

  • Scattered

records of GGBFs

  • Single, large

population

  • Development

areas treated as separate

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GGBF population size on Kooragang/ Ash Island

  • The trend is in the

wrong direction!

1,995 2,000 2,005 2,010 2,015

YEAR

200 400 600 800 1,000

# GGBF adults

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GGBF breeding and assessing human impacts

NO:

  • Calling (by males)
  • Eggs
  • Immatures
  • Adults

YES:

  • Tadpoles
  • Metamorphs
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Impacts on GGBFs on Kooragang island

  • GGBF breeding

habitat lost

BHPB 1.4ha => 0.7ha NCIG 0.8ha

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Impacts on GGBFs on Kooragang island

  • GGBF breeding

habitat lost

BHPB & NCIG 1.5ha PWCS 5.1ha Death by three cuts

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GGBFs in Ramsar wetland

  • Kooragang population

declines => Fewer GGBFs in Ramsar wetland

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No worries? – New breeding habitat on the way

  • Success unlikely

& will take time

Recipe not worked out Previous such attempts have mostly failed Max success rate

  • nly ~10%

Outcome requires at least 3 years

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Proposed Brundee offset area: Contribution to GGBF conservation?

  • Negligible

GGBF records few & restricted in location No breeding habitat Potential to develop breeding habitat

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Impact of proposed T4 project on GGBF

  • Likely extinction of

Kooragang/ Ash Island population

  • Negligible contribution

to GGBF conservation from proposed offset area T4 bad news for GGBF