Skip to Main Content
Rapid decline of the volcanically threatened Montserrat oriole.Author(s): Geoff M. Hilton; Phil W. Atkinson; Gerard A.L. Gray; Wayne J. Arendt; David W. Gibbons
Source: Biological Conservation 111 :79–89
Publication Series: Miscellaneous Publication
PDF: View PDF (0 B)
DescriptionPrior to 1995, the Montserrat oriole (Icterus oberi) was confined to ca. 30 km2 of hill forest on the Lesser Antillean island of Montserrat, but was not listed as globally threatened. Since then, the eruption of the Soufriere Hills volcano has destroyed more than half of the species’ range. Recent intensive monitoring has indicated that the species has also declined dramatically within the remaining intact forest, and is now critically threatened. Different monitoring and analytical methods indicate a decline of 8–52% p.a., and a remaining global population of ca. 100–400 pairs. This case study justifies the use of the restricted range criterion in designating threatened species. Despite intensive monitoring and the use of several analytical methods, it has proved surprisingly difficult to estimate the magnitude of the oriole’s decrease, or to control for potential artefacts in the census method. We discuss the reasons for this. The cause(s) of population decline in the intact forest are unclear, though two hypotheses appear plausible: a decrease in arthropod food, a result of volcanic ash fall, and an increase in nest predation as a result of increases in populations of opportunistic omnivores.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationHilton,Geoff M.; Atkinson, Phil W.; Gray, Gerard A.L.; Arendt,Wayne J.; Gibbons, David W. 2003. Rapid decline of the volcanically threatened Montserrat oriole. Biological Conservation. 111:79–89
KeywordsBird census technique, Volcano, Icterus oberi, Ecological disturbance
- Impacts of a volcanic eruption on the forest birdcommunity of Montserrat, Lesser Antilles.
- Population decline of the Elfin-woods Warbler Setophaga angelae in eastern Puerto Rico
- 6.0 Monitoring recovery from calcium depletion and nitrogen saturation
XML: View XML