Data Zone
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| A3be+4be | A3be+4be; B2ab(v) | A3be+4be; B2ab(v); D2 |
| Year | Category | Criteria |
|---|---|---|
| 2022 | Critically Endangered | A3be+4be |
| 2018 | Endangered | B2ab(v) |
| 2016 | Endangered | B2ab(v) |
| 2012 | Not Recognised | |
| 2008 | Not Recognised | |
| 2004 | Not Recognised | |
| 2000 | Not Recognised | |
| 1994 | Not Recognised | |
| 1988 | Not Recognised |
| Migratory status | full migrant | Forest dependency | does not normally occur in forest |
| Land-mass type | Average mass | 159 g |
| Estimate | Data quality | |
|---|---|---|
| Number of locations | 2-10 | - |
| Severely fragmented? | no | - |
| Estimate | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| Population size | 48300-2421480 mature individuals | poor | estimated | 2020 |
| Population trend | decreasing | - | inferred | 2020-2054 |
| Rate of change over the future 10 years/3 generations (longer of the two periods) | 95.7% | - | - | - |
| Rate of change over the past & future 10 years/3 generations (longer of the two periods) | 95.7% | - | - | - |
| Generation length | 11.15 years | - | - | - |
Population justification: Jones et al. (2021) estimate the population on Gough in 2020 to be 175,000 pairs (95% CI 24,000-1,210,000 pairs [48,000-2,420,000 mature individuals). An additional 150-200 breeding pairs (c.300-400 mature individuals) were estimated to be present on Roche Quille, Île Saint-Paul (Jiguet et al. 2007). Following the successful eradication of the Black Rat (Rattus rattus) and European Rabbit (Oryctolagus cuniculus), surveys showed an increase in numbers with a rough estimate of 740 breeding pairs (Barbraud et al. 2021). However, mice are still present on Saint-Paul, so the long term prospects of this population remain unknown (C. W. Jones in litt. 2022). The population size is therefore estimated to be in the range of 48,300-2,421,480 mature individuals.
Trend justification: This species is inferred to be declining as it is currently suffering a very high chick mortality rate as a result of nest predation by mice (Dilley et al. 2015). These declines are projected to occur at a rate of 9% per annum over the next 36 years (Jones et al. 2021), a rate equivalent to 95.7% over three generation lengths (33.45 years [Bird et al. 2020]). A mouse eradication attempt on Gough Island occurred in June-August 2021, and although this killed a large proportion of the island's mice, some mice did survive the attempt (S. Oppel in litt. 2022). Although it is unknown how long it will take mice to reach carrying capacity, it is likely there will be no long-term improvement in breeding success that could counteract the current projected declines.
| Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
|---|---|---|---|---|---|---|
| French Southern Territories | extant | native | yes | |||
| St Helena (to UK) | extant | native | yes |
| Country/Territory | IBA Name |
|---|---|
| French Southern Territories | Île aux Cochons |
| French Southern Territories | Île de l'Est |
| French Southern Territories | Île de la Possession |
| French Southern Territories | Îles des Apôtres |
| South Africa | Prince Edward Islands Special Nature Reserve |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Caves and Subterranean Habitats (non-aquatic) | Caves | suitable | breeding |
| Grassland | Subantarctic | major | breeding |
| Marine Neritic | Pelagic | major | breeding |
| Marine Neritic | Pelagic | major | non-breeding |
| Marine Oceanic | Epipelagic (0-200m) | major | breeding |
| Marine Oceanic | Epipelagic (0-200m) | major | non-breeding |
| Altitude | 0 - 300 m | Occasional altitudinal limits |
| Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Mus musculus | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | Very Rapid Declines | High Impact: 8 | ||||||
|
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| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Named species | Timing | Scope | Severity | Impact | ||||
| Past, Likely to Return | Minority (<50%) | Slow, Significant Declines | Past Impact | ||||||
|
|||||||||
| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Named species | Timing | Scope | Severity | Impact | ||||
| Past, Unlikely to Return | Minority (<50%) | Very Rapid Declines | Past Impact | ||||||
|
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Recommended citation
BirdLife International (2024) Species factsheet: MacGillivray's Prion Pachyptila macgillivrayi. Downloaded from
https://datazone.birdlife.org/species/factsheet/macgillivrays-prion-pachyptila-macgillivrayi on 26/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from
https://datazone.birdlife.org/species/search on 26/12/2024.