Nesoenas mayeri

Taxonomy

Assessment Information

Geographic Range

Population

Habitat and Ecology

Threats

Conservation Actions

Bibliography

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Taxonomy [top]

Kingdom	Phylum	Class	Order	Family
ANIMALIA	CHORDATA	AVES	COLUMBIFORMES	COLUMBIDAE

Scientific Name:

Nesoenas mayeri

Species Authority:

Prévost, 1843

Common Name/s:

English	–	Pink Pigeon
French	–	Pigeon rose
Spanish	–	Paloma de Mauricio

Taxonomic Notes:

Columba picturata and C. mayeri (Sibley and Monroe 1990, 1993) were previously transferred to the genus Streptopelia following Johnson et al. (2001), but are now placed in Nesoenas following Cheke (2005).

Assessment Information [top]

Red List Category & Criteria:

Endangered B1ab(iii) ver 3.1

Year Published:

2012

Assessor/s:

BirdLife International

Reviewer/s:

Butchart, S. & Taylor, J.

Contributor/s:

Bell, D., Bunberry, N., Edmunds, K., Hall, D., Jones, C., Swinnerton, K. & Tatayah, V.

Justification:
The population of this species has increased as a result of intensive conservation action, and exceeded 50 mature individuals in 1993, and 300 in 2000. However, it has a very small range concentrated in just a few locations, and remains threatened by a continuing decline in the quality of suitable habitat. For these reasons, the species is still listed as Endangered, however it may become eligible for downlisting in the future. Numbers fluctuate owing to predation and disease and it seems doubtful that present populations could be maintained without the current intense management programme.

History:

2008	–	Endangered
2006	–	Endangered
2004	–	Endangered
2000	–	Endangered
1996	–	Critically Endangered
1994	–	Critically Endangered

Geographic Range [top]

Range Description:	Nesoenas mayeri survives in the Black River Gorges of south-west Mauritius and on Ile aux Aigrettes, just off the eastern coast. Although once common, it declined to just 10 wild individuals in 1990, and were it not for intervention, it would have rapidly gone extinct. Since then, intensive management has resulted in a spectacular increase, although the population is still dependant on ongoing intensive management. Since 2000 the population has been over 300 individuals in five subpopulations; numbers have fluctuated but in April 2007 there were 380 birds (C. Jones in litt. 2007), in April 2010 the population was estimated at 376-493 birds (V. Tatayah in litt. 2010) and in August 2011 the population was estimated at 446 birds in six subpopulations (five in the National Park and one on Ile aux Aigrettes). In 2007, of the five established subpopulations, two were in decline (Plaine Lievre c. 110 birds and Bel Ombre c. 48 birds), two were increasing (Pigeon Wood c. 65 birds and Combo c. 65 birds) and the subpopulation on Ile aux Aigrettes was believed to have reached carrying capacity and to be stable at 85 birds (K. Edmunds in litt. 2007). It is now thought that the Ile aux Aigrettes birds and probably other subpopulations are undergoing natural fluctuations (V. Tatayah in litt. 2010). There is some limited movement between the mainland populations (Jones and Swinnerton 1997), and in 2010 five birds out of 27 which had been translocated from the mainland to Ile aux Aigrettes flew back to the mainland (Raffa 2011).
Countries:	Native: Mauritius
Range Map:	Click here to open the map viewer and explore range.

Population [top]

Population:	C. Jones in litt. (2005) estimated the population to number 360-395 individuals in total, roughly equating to 240-260 mature individuals.
Population Trend:	Decreasing

Habitat and Ecology [top]

Habitat and Ecology:	It inhabits native forest and has a diverse diet, including both native and exotic plants (Jones 1987). In the early 1990s, the entire wild population nested in a single grove of introduced Japanese red cedar Cryptomeria japonica. However, ongoing studies suggest that rat predation in Cryptomeria is higher than in native vegetation, thus the value of Cryptomeria is unclear (Carter 1998, Swinnerton 2001). When there is available restored native vegetation for nesting, birds use this in preference to exotic species.
Systems:	Terrestrial

Habitat and Ecology:

It inhabits native forest and has a diverse diet, including both native and exotic plants (Jones 1987). In the early 1990s, the entire wild population nested in a single grove of introduced Japanese red cedar Cryptomeria japonica. However, ongoing studies suggest that rat predation in Cryptomeria is higher than in native vegetation, thus the value of Cryptomeria is unclear (Carter 1998, Swinnerton 2001). When there is available restored native vegetation for nesting, birds use this in preference to exotic species.

Systems:

Terrestrial

Threats [top]

Major Threat(s):	Severe loss of habitat has been compounded by continued predation of nests and adults by introduced crab-eating macaque Macaca fascicularis, mongoose Herpestes auropunctatus, rats and feral cats (Reese Lind 1994, Swinnerton 2001). Invasive plant species reduce the quality of breeding and foraging habitat. Cyclones destroy nests and accelerate habitat degradation (C. Jones in litt. 2000). Natural food shortages mean that birds must be provided with supplementary food. The disease Trichomonosis was brought to Mauritius by alien pigeons (which now act as a reservoir for the disease) and 359 (84.3%) of 429 individual birds screened between 2002-2004 tested positive for Trichomonas gallinae at least once, however pathogenicity was found to be low, with active sigens of the disease recorded in only 1.9% of birds which tested positive (Bunbury et al. 2008). Nevertheless, the disease causes significant levels of mortality, especially in juveniles, and it is likely to be limiting population growth (Swinnerton et al. 2005, Bunbury et al. 2008). Inbreeding depression is an ongoing concern (Swinnerton et al. 2004).

Major Threat(s):

Severe loss of habitat has been compounded by continued predation of nests and adults by introduced crab-eating macaque Macaca fascicularis, mongoose Herpestes auropunctatus, rats and feral cats (Reese Lind 1994, Swinnerton 2001). Invasive plant species reduce the quality of breeding and foraging habitat. Cyclones destroy nests and accelerate habitat degradation (C. Jones in litt. 2000). Natural food shortages mean that birds must be provided with supplementary food. The disease Trichomonosis was brought to Mauritius by alien pigeons (which now act as a reservoir for the disease) and 359 (84.3%) of 429 individual birds screened between 2002-2004 tested positive for Trichomonas gallinae at least once, however pathogenicity was found to be low, with active sigens of the disease recorded in only 1.9% of birds which tested positive (Bunbury et al. 2008). Nevertheless, the disease causes significant levels of mortality, especially in juveniles, and it is likely to be limiting population growth (Swinnerton et al. 2005, Bunbury et al. 2008). Inbreeding depression is an ongoing concern (Swinnerton et al. 2004).

Conservation Actions [top]

Conservation Actions:	Conservation Actions Underway A captive-breeding and reintroduction programme, combined with establishment of Conservation Management Areas, habitat restoration, control of exotic predators, supplementary feeding, nest guarding, clutch and brood (fostering) manipulations, rescue of eggs and young from failing nests, control of disease and monitoring of survival and productivity, has helped this species survive (C. Jones in litt. 2000). The Black River National Park covers much of its range (Swinnerton 2001). The population is managed to maximise genetic diversity and counter the effects of inbreeding depression, with birds moved beetween subpopulations (Swinnerton et al. 2004, Raffa 2011). There are plans to release three additional populations (K. Edmunds in litt. 2007). Conservation Actions Proposed Continue research into population genetics and disease (C. Jones in litt. 2000). Continue rehabilitation of mainland native vegetation (Safford and Jones 1998). Continue intensive mangement of wild-living populations. Extend Conservation Management Areas and surrounding predator-proof fences (C. Jones in litt. 2000). Consider introduction to other Mauritian islets (and Réunion) if ecosystem rehabilitation and predator elimination are successful (Safford and Jones 1998).

Conservation Actions:

Conservation Actions Underway
A captive-breeding and reintroduction programme, combined with establishment of Conservation Management Areas, habitat restoration, control of exotic predators, supplementary feeding, nest guarding, clutch and brood (fostering) manipulations, rescue of eggs and young from failing nests, control of disease and monitoring of survival and productivity, has helped this species survive (C. Jones in litt. 2000). The Black River National Park covers much of its range (Swinnerton 2001). The population is managed to maximise genetic diversity and counter the effects of inbreeding depression, with birds moved beetween subpopulations (Swinnerton et al. 2004, Raffa 2011). There are plans to release three additional populations (K. Edmunds in litt. 2007).

Conservation Actions Proposed
Continue research into population genetics and disease (C. Jones in litt. 2000). Continue rehabilitation of mainland native vegetation (Safford and Jones 1998). Continue intensive mangement of wild-living populations. Extend Conservation Management Areas and surrounding predator-proof fences (C. Jones in litt. 2000). Consider introduction to other Mauritian islets (and Réunion) if ecosystem rehabilitation and predator elimination are successful (Safford and Jones 1998).

Bibliography [top]

	Bunbury, N.; Jones, C. G.; Greenwood, A. G.; Bell, D. J. 2008. Epidemiology and conservation implications of Trichomonas gallinae infection in the endangered Mauritian Pink Pigeon. Biological Conservation 141(1): 153-161. Carter, S. 1998. Mammalian predation on endangered Mauritian birds: predator identification, impacts and refuges in exotic vegetation. Unpublished thesis, Royal Holloway College, University of London.. IUCN. 2012. IUCN Red List of Threatened Species (ver. 2012.1). Available at: http://www.iucnredlist.org. (Accessed: 19 June 2012). Jones, C. G. 1987. The larger land-birds of Mauritius. In: Diamond, A.W. (ed.), Studies of Mascarene Island birds, pp. 208-300. Cambridge University Press, Cambridge, U.K. Jones, C. G.; Swinnerton, K. J. 1997. A summary of the conservation status and research for the Mauritius Kestrel Falco punctatus, Pink Pigeon Columba mayeri and Echo Parakeet Psittacula eques. Dodo: Journal of the Jersey Wildlife Preservation Trust 33: 72-75. Raffa, E. 2011. Translocating Pink Pigeons. Mauritian Wildlife Foundation Newsletter: 5. Reese Lind, C. 1994. Management of the EEP Pink Pigeon Columba (Nesoenas) mayeri population. Dodo: Journal of the Jersey Wildlife Preservation Trust 30: 106-113. Safford, R. J. 1997. A survey of the occurrence of native vegetation remnants on Mauritius in 1993. Biological Conservation 80: 181-188. Safford, R. J.; Jones, C. G. 1998. Strategies for land-bird conservation on Mauritius. Conservation Biology 12: 169-176. Swinnerton, K. 2001. Ecology and conservation of the Pink Pigeon Columba mayeri on Mauritius. Dodo: Journal of the Jersey Wildlife Preservation Trust 37: 99. Swinnerton, K.; Groombridge, J.J.; Jones, C. G.; Burn, R.W.; Mungroo, Y. 2004. Inbreeding depression and founder diversity among captive and free-living populations of the endangered pink pigeon Columba mayeri. Animal Conservation 7(4): 353-364. Swinnerton, K.J.; Greenwood, A. G.; Chapman, R.E.; Jones, C. G. 2005. The incidence of the parasitic disease trichomoniasis and its treatment in reintroduced and wild Pink Pigeons Columba mayeri. Ibis 147: 772-782.

Bunbury, N.; Jones, C. G.; Greenwood, A. G.; Bell, D. J. 2008. Epidemiology and conservation implications of Trichomonas gallinae infection in the endangered Mauritian Pink Pigeon. Biological Conservation 141(1): 153-161.

Carter, S. 1998. Mammalian predation on endangered Mauritian birds: predator identification, impacts and refuges in exotic vegetation. Unpublished thesis, Royal Holloway College, University of London..

IUCN. 2012. IUCN Red List of Threatened Species (ver. 2012.1). Available at: http://www.iucnredlist.org. (Accessed: 19 June 2012).

Jones, C. G. 1987. The larger land-birds of Mauritius. In: Diamond, A.W. (ed.), Studies of Mascarene Island birds, pp. 208-300. Cambridge University Press, Cambridge, U.K.

Jones, C. G.; Swinnerton, K. J. 1997. A summary of the conservation status and research for the Mauritius Kestrel Falco punctatus, Pink Pigeon Columba mayeri and Echo Parakeet Psittacula eques. Dodo: Journal of the Jersey Wildlife Preservation Trust 33: 72-75.

Raffa, E. 2011. Translocating Pink Pigeons. Mauritian Wildlife Foundation Newsletter: 5.

Reese Lind, C. 1994. Management of the EEP Pink Pigeon Columba (Nesoenas) mayeri population. Dodo: Journal of the Jersey Wildlife Preservation Trust 30: 106-113.

Safford, R. J. 1997. A survey of the occurrence of native vegetation remnants on Mauritius in 1993. Biological Conservation 80: 181-188.

Safford, R. J.; Jones, C. G. 1998. Strategies for land-bird conservation on Mauritius. Conservation Biology 12: 169-176.

Swinnerton, K. 2001. Ecology and conservation of the Pink Pigeon Columba mayeri on Mauritius. Dodo: Journal of the Jersey Wildlife Preservation Trust 37: 99.

Swinnerton, K.; Groombridge, J.J.; Jones, C. G.; Burn, R.W.; Mungroo, Y. 2004. Inbreeding depression and founder diversity among captive and free-living populations of the endangered pink pigeon Columba mayeri. Animal Conservation 7(4): 353-364.

Swinnerton, K.J.; Greenwood, A. G.; Chapman, R.E.; Jones, C. G. 2005. The incidence of the parasitic disease trichomoniasis and its treatment in reintroduced and wild Pink Pigeons Columba mayeri. Ibis 147: 772-782.

Citation:	BirdLife International 2012. Nesoenas mayeri. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 22 May 2013.
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