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Description |
Geographic Range [top]
Range Description: Acrocephalus orinus was known until relatively recently from only from one specimen, collected in the Sutlej Valley near Rampoor, Himachal Pradesh, India in November 1867. In March 2006, one was trapped at Laem Phak Bia, Phatchaburi Province, south-west Thailand, 3,100 km from the type locality (Round et al. 2007), and soon afterwards a further museum specimen was located (taken in Uttar Pradesh, India in October 1869, and previously labelled as A. dumetorum) (Anon 2007, Pearson et al. 2008). Subsequent searches have located additional museum specimens from Central Asia, India and Myanmar (Svensson et al. 2008). In April 2007 a bird apparently of this species was observed and photographed near Chintamani Kar Bird Sanctuary, Narendrapur, West Bengal, India (Round and Kennerley 2007). No other individuals were trapped at the site of the 2006 bird during 2000-2006 and the lack of records from this comparatively well-studied country suggest it is likely to be only an extreme vagrant to Thailand (Round et al. 2007). Fieldwork conducted in Badakshan province, north-eastern Afghanistan, located a likely breeding population in 2008-2009 (Timmins et al. 2009, 2010). In spring 2009, a probable breeding population was also located in the Badakshan region of Tajikistan (Ayé et al. 2010). It may be a long-distance migrant like A. dumetorum, breeding in the Palearctic and wintering in southern Asia. It may be genuinely rare but it is possible a substantial population exists and has been overlooked due to its similarity to A. concinens and A. dumetorum. Its taxonomic status was uncertain for more than a century but was recently confirmed based on morphology and mtDNA evidence (Bensch and Pearson 2002). Given the lack of information, and the previous confusion over the status of this taxon, it is best treated presently as Data Deficient.
Countries occurrence:
Native:
Afghanistan; Myanmar; Tajikistan
Present - origin uncertain:
India; Kazakhstan; Pakistan; Thailand
Continuing decline in area of occupancy (AOO): Unknown
Extreme fluctuations in area of occupancy (AOO): No
Estimated extent of occurrence (EOO) - km2: 22400
Continuing decline in extent of occurrence (EOO): Unknown
Extreme fluctuations in extent of occurrence (EOO): No
Continuing decline in number of locations: Unknown
Extreme fluctuations in the number of locations: No
Range Map: Click here to open the map viewer and explore range.
Population [top]
Population: The global population size has not been quantified, but the species is described as probably extremely rare (del Hoyo et al. 2006).
Trend Justification: The current trend is unknown as almost nothing is known of the speciess range, movements or ecological requirements.
Current Population Trend: Unknown
Additional data:
?Number of mature individuals: Unknown ?Continuing decline of mature individuals: Unknown
?Extreme fluctuations: No ?Population severely fragmented: No
?Continuing decline in subpopulations: Unknown
?Extreme fluctuations in subpopulations: No ?All individuals in one subpopulation: No
Habitat and Ecology [top]
Habitat and Ecology: The 2006 Thailand bird was trapped in area of grassy filter beds at a water treatment site in an area dominated by salt-pans but it is likely this record refers to a vagrant and thus may not be representative of its habitat preferences (Round et al. 2007). The sighting near Kolkata in April 2007 was of a bird feeding in tall bamboo. The likely breeding populations located in north-eastern Afghanistan and in Tajikistan were found in riparian bushland/woodland (Ayé et al. 2010, Timmins et al. 2010).
Systems: Freshwater
Continuing decline in area, extent and/or quality of habitat: Unknown
Generation Length (years): 4.4
Movement patterns: Full Migrant
Threats [top]
Major Threat(s): Unknown.
Conservation Actions [top]
Conservation Actions: Conservation Actions Underway
None is known.
Conservation Actions Proposed
Examine Acrocephalus museum specimens to search for further examples of the species and to further elucidate its distribution and migration patterns. Obtain photographic evidence and, ideally, DNA from putative individuals. Examine the possibility of stable isotope analysis of any further individuals that are trapped, with the aim of discovering other breeding grounds.
Citation: BirdLife International. 2012. Acrocephalus orinus. The IUCN Red List of Threatened Species 2012: e.T22729551A38224921. http://dx.doi.org/10.2305/IUCN.UK.2012-1.RLTS.T22729551A38224921.en. Downloaded on 09 December 2015.
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