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Projeto de Restauro do Habitat da Geórgia do Sul — Erradicação de Roedores em Toda a Ilha para a Recuperação das Aves Marinhas

Geórgia do Sul e Ilhas Sandwich do Sul · Grytviken · Ver o perfil de Geórgia do Sul e Ilhas Sandwich do Sul

Evidência: Observacional / pré-pós Top 81% 33/100 · Pergunte a Evidence Copilot sobre esta prática

O maior projeto de erradicação de roedores do mundo eliminou ratos e ratazanas de mais de 100 000 ha da Geórgia do Sul entre 2011 e 2015, permitindo a recuperação de aves marinhas; declarada livre de roedores em 2018, com custo revisto por pares de cerca de 7,5 milhões de libras.

128 km²
Rodent baiting phase 1 area (2011) (2011)
580 km²
Rodent baiting phase 2 area (2013) (2013)
360 km²
Rodent baiting phase 3 area (2015) (2015)
4600+ devices
Detection devices deployed for verification (2015-2018)
7 of 30 species
Bird species with documented short-term losses (of 30 monitored) (2011-2018)
8 x larger
Scale relative to previous largest eradication (Macquarie Island) (2018)
Projeto de Restauro do Habitat da Geórgia do Sul — Erradicação de Roedores em Toda a Ilha para a Recuperação das Aves Marinhas

Detalhes

Maturidade
Consolidada
Promotor
South Georgia Heritage Trust (SGHT)
Período
2011-2018 (baiting 2011-2015, declared rodent-free 2018)
Palavras-chave
invasive species eradication, island restoration, seabird conservation, public-works conservation finance

Contexto

Two centuries of visiting sealing and whaling ships left South Georgia infested with Norway rats and house mice, which devastated the ground-nesting colonies of the South Georgia pipit — the world's southernmost-breeding songbird — and the South Georgia pintail across the island's 3,528 km² of mostly ice-free habitat.

Atividades

Between 2011 and 2015 the South Georgia Heritage Trust, with the Government of South Georgia and the South Sandwich Islands and the Friends of South Georgia Island, ran three helicopter-based aerial baiting phases in stages of increasing scale (128 km² in 2011, 580 km² in 2013, 360 km² in 2015), followed by a multi-year verification programme using more than 4,600 detection devices and three trained detection dogs.

Resultados

On 8 May 2018 the government declared South Georgia officially rodent-free, more than eight times the scale of the previous largest eradication (Macquarie Island, Australia). Peer-reviewed monitoring published in Oryx documents that South Georgia pipits recolonised the mainland and were the first bird to breed in newly rat-free areas, and that skua and snowy sheathbill numbers recovered within five years of baiting, though 7 of 30 monitored bird species suffered documented short-term losses during the operation.

Implementação

Custo indicativo
Elevado (500 mil €–5 M€) — Peer-reviewed estimate ~£7.5 million (~£69/hectare); other sources cite ~£10 million total, funded almost entirely by public and philanthropic donation rather than government appropriation.
Tempo até resultados
Longo (> 3 anos) — Baiting conducted in three phases (2011, 2013, 2015); multi-year verification programme confirmed rodent-free status, declared officially on 8 May 2018.
Equipa e competências
South Georgia Heritage Trust field and verification teams, Three trained detection dogs

Condições de sucesso

  • Three-phase progressively scaled aerial baiting to manage operational risk
  • Multi-year verification with >4,600 detection devices and trained dogs before declaring success
  • Sustained philanthropic/public donation funding independent of government appropriation

Modos de falha comuns

  • 7 of 30 monitored bird species suffered documented short-term losses during the baiting operation

Habitualmente financiado por

Philanthropic / foundation funding

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Fontes de dados

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Anexos

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