|Scientific Name:||Podilymbus gigas Griscom, 1929|
|Taxonomic Source(s):||Brooks, T. 2000. Extinct species. In: BirdLife International (ed.), Threatened Birds of the World, pp. 701-708. Lynx Edicions and BirdLife International, Barcelona and Cambridge, U.K.|
|Red List Category & Criteria:||Extinct ver 3.1|
|Reviewer(s):||Butchart, S. & Symes, A.|
|Facilitator/Compiler(s):||Brooks, T., Khwaja, N., Mahood, S., Martin, R|
This species was endemic to Lake Atitlán, Guatemala, but is now Extinct. Its extinction occurred sometime between 1983 and 1986, caused by myriad alterations to its habitat.
|Previously published Red List assessments:|
|Range Description:||Podilymbus gigas was endemic to Lake Atitlán, Guatemala (LaBastille 1974).|
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||Its population dropped from c.200 to 80 in the 1960s, but recovered to a high of 232 in 1975 (LaBastille 1984). However, various factors drove the population down to 30 by 1983, and it was extinct by 1986 (LaBastille 1990).|
|Habitat and Ecology:||It inhabited one freshwater lake.|
|Continuing decline in area, extent and/or quality of habitat:||Unknown|
|Generation Length (years):||5.4|
|Movement patterns:||Not a Migrant|
|Congregatory:||Congregatory (and dispersive)|
|Major Threat(s):||Initial population declines were a result of competition and predation by large-mouth bass Micropterus salmoides, introduced into the lake in 1960 (LaBastille 1984). However, increasing pressure on breeding sites from local reed-cutting and from tourism development, along with the murder of the government game warden for the national park during the political unrest of 1982 and falling lake levels following the earthquake of 1976, are likely to be the factors which drove the population to extinction (LaBastille 1990). Drowning in gill nets and disturbance by increasing boat traffic have also been suggested as contributory factors (Collar et al. 1994).|
Conservation Actions Underway
Still listed on Appendix I of CITES.
Collar, N. J.; Crosby, M. J.; Stattersfield, A. J. 1994. Birds to watch 2: the world list of threatened birds. BirdLife International, Cambridge, U.K.
Howell, S. N. G.; Webb, S. 1995. A guide to the birds of Mexico and northern Central America. Oxford University Press, Oxford.
Hunter, L. A. 1988. Status of the endemic Atitlán Grebe of Guatemala: is it extinct? Condor 90: 906-912.
IUCN. 2016. The IUCN Red List of Threatened Species. Version 2016-3. Available at: www.iucnredlist.org. (Accessed: 07 December 2016).
LaBastille, A. 1974. Ecology and Management of the Atitlán Grebe, Lake Atitlán, Guatemala. Wildlife Society, Unknown.
LaBastille, A. 1984. Drastic decline in Guatemala's giant pied-billed grebe population. Environmental Conservation 11: 346-348.
LaBastille, A. 1990. WW Norton and Company, New York, USA.
Livezey, B. C. 1989. Flightlessness in grebes (Aves: Podicipedidae): its independent evolution in three genera. Evolution 43: 29-53.
|Citation:||BirdLife International. 2016. Podilymbus gigas. The IUCN Red List of Threatened Species 2016: e.T22696577A93572322.Downloaded on 22 January 2018.|
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