Archived 2014 discussion: Standardwing (Semioptera wallacii): uplist to Near Threatened?

This discussion was first published as part of the 2013 Red List update, but remains open for comment to enable reassessment in 2014.

Standardwing Semioptera wallacii (BirdLife species factsheet) is found on Halmahera, Kasiruta and Bacan (in the Northern Maluku Endemic Bird Area), Indonesia, where it inhabits primary and logged rainforest in the lowlands and hills, from sea-level to 1,000-1,200 m, but mostly above 250 m, occurring rarely in mature secondary woodland (del Hoyo et al. 2009).

It is currently listed as being of Least Concern, on the basis that it was not thought to approach the thresholds for Vulnerable under any of the IUCN Red List criteria.

A recent study by Vetter (2009) used remote sensing techniques to track the rate and spatial pattern of forest loss in the Northern Maluku Endemic Bird Area between 1990 and 2003, and project rates of deforestation over the next three generations for restricted range bird species found in this region, with consequent recommendations for category changes on the IUCN Red List.

This study estimated the rate of forest loss within the geographic and elevation range of Standardwing to be c.8.4% between 1990 and 2003, and projected the loss of c.16.6% of forest in its range over the next three generations (estimated by BirdLife to be c.24 years, based on an estimated generation length of c.7.9 years). Vetter (2009) recommends that it be uplisted to Vulnerable, based on its small range (IUCN Red List criterion B) and the analysis of forest loss; however, the species is not considered to be restricted to fewer than 11 locations and its habitat may not be severely fragmented (over 50% in patches too small to support viable populations).

It is suggested that the species be uplisted to Near Threatened under criterion B1ab(ii,iii,v), on the basis that it has a small range, occupying an Extent of Occurrence (EOO) estimated at c.13,300 km2, in which suitable habitat is considered very fragmented by clearance for logging, agriculture and development, but is not considered severely fragmented under the IUCN definition, and the area and quality of suitable habitat is in continuing decline, with continuing declines in the species’s population inferred as a result.

Comments on this potential category change and further information would be welcomed.

References:

del Hoyo, J., Elliott, A. and Christie, D. (2009) Handbook of the Birds of the World, vol. 14: Bush-shrikes to Old World Sparrows. Barcelona, Spain: Lynx Edicions.

Vetter, J. (2009) Impacts of Deforestation on the Conservation Status of Endemic Birds in the North Maluku Endemic Bird Area from 1990-2003. MSc Project. Durham, NC: Duke University.

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3 Responses to Archived 2014 discussion: Standardwing (Semioptera wallacii): uplist to Near Threatened?

  1. Joe Taylor says:

    The following comments were received from Burung Indonesia on 27 February 2014:

    During the avifauna surveys conducted by Burung Indonesia in 2008-2012, in North Maluku, observations of Standarwing were quite often during the surveys, both within the area of Aketajawe Lolobata national park (Halmahera) and outside the national park. Encounter of this species is more frequent in Lolobata block (East Halmahera) than Aketajawe block (central part of Halmahera). In Halmahera, the encounter occurred in primary and secondary forests , 40 to 1.070 meters above sea level.

    Burung Indonesia did an intensive survey of avifauna twice in Aketajawe Lolobata national park, namely in 2008 and 2012, beside that, Burung Indonesia also conducted short small scale surveys whether inside Aketajawe Lolobata national park or at surrounding area.

    Over the past 5 years (2008-2012), there is no significant land use change occurs inside the national park area. Changes in forest cover are more frequent occur outside of the national park, whether it turns into human settlement , agricultural land / plantation, and logging activities from the mining companies.

    Based on Burung Indonesia avifauna survey in 2012, the population density of this species was estimated at 6.83 individuals/km2 in Aketajawe block and 36.37 in Lolobata block or total of38.075 individual inside the primary forest habitat of Aketajawe Lolobata National Park (167.300 ha), Halmahera . Although the encounter rate for this species is not common, however, this species could be easily encountered in suitable habitats (primary forest above an altitude of 600 meters above sea level) .

    Burung Indonesia has also conduct habitat condition surveys, especially survey for display site of this species inside Aketajawe Lolobata national park area (2010). The survey shows that although Standardwing can be found in primary and secondary forests , but the location for the display ( lek -site ), only found in primary forest. Three lek -site location were found in Aketajawe block, at the altitude of 81, 115, and 117 meters above sea level ( Bashari , 2011) .

    Uplisting of this species to Near Threatened is possible, considering this species is North Maluku endemic and quite dependent on the presence of submontane and montane primary forest.

    References:
    Bashari, H. 2012. Survei Avifauna di Dalam Kawasan Taman Nasional Aketajawe Lolobata, Halmahera, Maluku Utara. Laporan Teknis. Program Kemiteraan untuk Pengelolaan Konservasi di Kawasan TN Aketajawe Lolobata. Burung Indonesia. Bogor.

    Bashari, H. 2011. Kajian Status dan Habitat Bidadari Halmahera Semioptera wallacii di Kawasan Taman Nasional Aketajawe Lolobata, Pulau Halmahera, Maluku Utara. Laporan Teknis No. 08. Program Kemiteraan untuk Pengelolaan Konservasi di Kawasan TN Aketajawe Lolobata. Burung Indonesia. Bogor

  2. Andy Symes says:

    Preliminary proposals

    Based on available information and comments posted above, our preliminary proposal for the 2014 Red List would be to treat Standardwing Semioptera wallacii as Near Threatened, approaching the threshold for Vulnerable under criterion B1ab(ii,iii,v).

    There is now a period for further comments until the final deadline of 31 March, after which recommended categorisations will be put forward to IUCN.

    The final Red List categories will be published on the BirdLife and IUCN websites in mid-2014, following further checking of information relevant to the assessments by both BirdLife and IUCN.

  3. Andy Symes says:

    Recommended categorisation to be put forward to IUCN

    Following further review, there has been no change to our preliminary proposal for the 2014 Red List status of this species.

    The final categorisation will be published later in 2014, following further checking of information relevant to the assessment by BirdLife and IUCN.

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