short communication Wader Study 126(1): 71–74. doi:10.18194/ws.00138
Status of Javan Plovers Charadrius javanicus on the Indralaya floodplains of South Sumatra, Indonesia
Doni Setiawan1, Muhammad Iqbal2*, Yopi Mainanda3, Rizky Hidayat3, Arum Setiawan1 & Indra Yustian1
1Department of Biology, Faculty of Science, Sriwijaya University, Jalan Raya Palembang-Prabumulih km 32, Indralaya, Sumatera Selatan 30662, Indonesia 2Conservation Biology Program, Faculty of Science, Sriwijaya University, Jalan Padang Selasa 524, Palembang, Sumatera Selatan 30139, Indonesia 3Community of Conservation, Department of Biology, Faculty of Science, Sriwijaya University, Jalan Raya Palembang- Prabumulih km 32, Indralaya, Sumatera Selatan 30662, Indonesia *Corresponding author: [email protected]
Keywords: Javan Plover, Charadrius javanicus, population, Sumatra, wetlands
The Javan PloverCharadrius javanicus is a small wader Plover can easily be distinguished by its variegated upper- formerly known as endemic to the coastal lowlands of parts when compared to the uniform upper-parts of Javan Java and Bali (MacKinnon & Phillipps 1993). Chasen Plover and Kentish Plover. Javan Plovers usually have a (1938), however, suggested that it occurred outside this white supercilium in front of the eye with an obvious area, and it has since been recorded as breeding on the pale buff extension behind the eye and a white hind- islands of Sumbawa and Sumba, and more recently in collar that is invariably incomplete; this contrasts with Sumatra, Sulawesi, Meno Island (off Lombok), Semau Kentish Plover which usually has a dusky brown supercilium Island (off West Timor), Flores and Timor-Leste (Iqbal et that is very indistinct behind the eye and a white collar al. 2011, 2013a, Trainor 2011). The taxonomic status of that is split dorsally by a brown line extending from the the Javan Plover is unclear. It is closely related to Kentish hind-crown, though it appears complete in most birds. Plover Charadrius alexandrinus, White-faced Plover C. We focussed on the Ogan River of Indralaya subdistrict dealbatus, White-fronted Plover C. marginatus, Snowy (a tributary of the Musi River) which flows through the Plover C. nivosus, and Red-capped Plover C. ruficapillus, floodplain, on which lakes, extending to about 400 ha, and on occasion all have been treated as conspecific. form during the rainy season. This area is a part of Recently, however, it has been tentatively regarded as a Dataran Banjir Ogan Komering, a site listed as an Important distinct species (del Hoyo & Collar 2014). Bird Area by Birdlife International (2018). The Indralaya Javan Plover was not recorded in Sumatra prior to 2007, floodplain covers 4 km2, which is 0.08% of the Dataran when it was reported as breeding in Lampung province, Banjir Ogan Komering area. During the rainy season southern Sumatra (Kennerley et al. 2008, Iqbal et al. (October–March), water levels are 4–5 m higher than 2011). It has since been recorded elsewhere in Sumatra during the dry season (April–September), and the area 2 on the islands of Bangka and Belitung and on the Indralaya covered by water increases from 50 km in August to 2 floodplain (Iqbal et al. 2013b, Iqbal 2015, Setiawan et al. 5,000 km in February. 2016). The recent spate of records outside Java is probably During 2013–2018, our waterbird monitoring on the at least partly due to increased survey effort, but another floodplain found that Javan Plovers occur there in small possible factor is that birds have dispersed from Java to numbers at three localities: Tanjung Putus, Tanjung Senai find suitable habitat, as many coastal areas of Java have and Danau Seruo (Figs. 1–3, Table 1). All sites have come under heavy development pressure (Iqbal et al. similar characteristics: flooding during October and 2013c). March, and dry during April to September. During the Since Javan Plovers were first found on the Indralaya dry season, the area provides many small grassy areas, floodplain in the Ogan Ilir district of South Sumatra which are suitable habitat for foraging and breeding (Fig. province, Sumatra (3°14'S, 104°38'E) in 2013, we have 4). When water level is increased, the suitable habitat is closely monitored their occurrence in this area, as part of limited, but it still contains foraging area. When the area waterbird monitoring activities of the Community of is mostly flooded (less than ca. 15% dry area; see Table Conservation of Sriwijaya University (a student organization 1), the habitat becomes largely unsuitable for Javan Plovers. of the Dept. of Biology, Faculty of Science, Sriwijaya Uni- Since Javan Plovers were first encountered on the Indralaya versity). Careful attention is paid to correct identification floodplain in 2013, they have been recorded in small using appropriate references (e.g. MacKinnon & Phillipps numbers in all survey years, although none were carried 1993, Iqbal et al. 2013b). Two similar species to Javan out in 2014 or 2015 (Table 1). Their consistent presence, Plover potentially found on Indralaya floodplain are in both wet and dry seasons, suggests the species is now Malaysian Plover C. peronii and Kentish Plover. Malaysian established as a resident. There has also been a trend for 72 Wader Study 126(1) 2019
Fig. 1. Map of the Indralaya floodplain (Indralaya subdistrict), OganIlir district, South Sumatra province, Sumatra, Indonesia. The area surveyed for Javan Plovers is indicated by the yellow box (inset). The pink line shows the boundaries of Indralaya subdistrict. The area covers 0.08% of Dataran Banjir Ogan Komering Lebak. The white star shows the location of Javan Plovers at Tanjung Putus, the white dots show records at Tanjung Senai, and the white triangles show records at Danau Seruo.
numbers to increase: from two in 2013, four in 2016, We consider it likely that Javan Plovers have bred in our three to seven in 2017, and eight to eleven in 2018 (Table study area or adjacent areas with similar wetland charac- 1). Numbers observed at Tanjung Senai and Danau Seruo teristics, including Indralaya Utara, Indralaya Selatan, in 2018 suggest that these birds are the same individuals, Pemulutan Barat, and Tanjung Batu subdistricts (all of because the two sites are only 2 km apart and within the these subdistricts are administratively located in Ogan range of expected local movements. Ilir district). This is suggested by their occurrence in all
Fig. 2. Javan Plover on 11 May 2016 at Danau Seruo, Indra- Fig. 3. Two Javan Plovers on 19 January 2017 at Danau laya floodplain, Sumatra, Indonesia (photo: Rizky Hidayat). Seruo, Indralaya floodplains, Sumatra, Indonesia (photo: Yopi Mainanda). short communications 73
months from January to May and in September, and also by the apparently increasing numbers (Table 1). On Java, breeding has been reported in May and June (Piersma & Wiersma 1996, Iwan Londo pers. comm.), and an adult with two chicks was observed in July in Sumatra (Iqbal et al. 2011). Breeding probably occurs at Indralaya during May to July, which is the early part of the dry season when water levels recede, providing areas of suitable breeding habitat, an extensive dry wet shortgrass habitat surrounded by fragmented pools of deeper area. Globally, Javan Plover is thought to have a small population (ca. 2,000–6,000 individuals; Iqbal et al. 2013) and to be declining; it is consequently classified as Near Threatened (Birdlife International 2017), although more information is needed for a strong conclusion. This series of observations of Javan Plovers on the Indralaya floodplains represents the first monitoring of the species in Sumatra. Further monitoring should be conducted to learn about population Fig. 4. Tanjung Senai on 1 October 2018, Indralaya trends and seasonal movements. floodplain, Sumatra, Indonesia (photo: Muhammad Iqbal).
Table 1. Waterbird surveys of the Indralaya floodplains, South Sumatra during 2012–2018, and the number of Javan Plovers recorded. Number Date Sites visited Effort (observers) Habitat status recorded 12 May 2012 0 Tanjung Putus 1 km walked in 1.5 hrs (DS, MI) Area ca. 35% dry
11 May 2013 0 Tanjung Putus 1 km walked in 1.5 hrs (DS, MI) Area ca. 30% dry
24 September 2013 2 Tanjung Putus 1 km walked in 1.5 hrs (DS, RH) Area ca. 35% dry 0 Tanjung Putus 11 May 2016 0 Tanjung Senai 3 km walked in 2.5 hrs (YM, RH) Area ca. 40% dry 4 Danau Seruo 0 Tanjung Putus 20 September 2016 0 Tanjung Senai 3 km walked in 2.5 hrs (YM, RH) Area ca. 40% dry 4 Danau Seruo 0 Tanjung Putus 19 January 2017 0 Tanjung Senai 3 km walked in 2.5 hrs (YM, RH) Area ca. 20% dry 3 Danau Seruo 23 January 2017 0 Tanjung Senai 3 km walked in 2.5 hrs (YM, RH) Area ca. 10% dry 0 Tanjung Putus 8 April 2017 0 Tanjung Senai 3 km walked in 2.5 hrs (YM, RH) Area ca. 30% dry 3 Danau Seruo 0 Tanjung Putus 13 May 2017 0 Tanjung Senai 3 km walked in 2.5 hrs (YM, RH) Area ca. 40% dry 7 Danau Seruo 0 Tanjung Putus 27 January 2018 0 Tanjung Senai 3 km walked in 2.5 hrs (YM, RH) Area ca. 10% dry 8 Danau Seruo 0 Tanjung Putus 25 February 2018 11 Tanjung Senai 3 km walked in 2.5 hrs (YM, RH) Area ca. 20% dry 0 Danau Seruo 0 Tanjung Putus 11 March 2018 8 Tanjung Senai 3 km walked in 2.5 hrs (YM, RH) Area ca. 25% dry 0 Danau Seruo 2.5 km walked in 2 hrs; most 0 Tanjung Putus 1 October 2018 observation in Tanjung Senai Area mostly dry 0 Tanjung Senai (MI, YM, RH, AS, IY) 74 Wader Study 126(1) 2019
We thank the Community of Conservation of Sriwijaya Iqbal, M., H. Abdillah, A. Nurza, T. Wahyudi, Giyanto & University for sharing their information regarding Javan M. Iqbal. 2013a. A review of new and noteworthy Plovers on the Indralaya floodplain, and Iwan Londo shorebird records in Sumatra, Indonesia, during 2001– (Iwan Febrianto) for his personal data on the breeding 2011. Wader Study Group Bulletin 120: 85–95. season of Javan Plover in Java and Sumatra. We are Iqbal, M., I. Taufiqurrahman, M.Gilfedder & K. Baskoro. grateful to Humphrey Sitters, Jesse Conklin, and an 2013b. Field identification of Javan PloverCharadrius anonymous reviewer for comments on an earlier draft. javanicus. Wader Study Group Bulletin 120: 96–101. Iqbal, M., I. Taufiqurrahman, K. Yordan & S. van Balen. BirdLife International. 2017. Charadrius javanicus. In: The 2013c. The distribution, abundance and conservation IUCN Red List of Threatened Species 2017. Accessed 23 status of the Javan Plover Charadrius javanicus. Wader Jun 2018 at: http://dx.doi.org/10.2305/IUCN.UK.2017-3. Study Group Bulletin 120: 75–79. RLTS.T22693839A118306149.en Kennerley, P.R., D.N. Bakewell & P.D. Round. 2008. Redis- BirdLife International. 2018. Important Bird Areas factsheet: covery of a long-lost Charadrius plover from South-East Dataran Banjir Ogan Komering. Accessed 26 Jun 2018 Asia. Forktail 24: 63–79. at: http://www.birdlife.org MacKinnon, J.R. & K. Phillips. 1993. A Field Guide to the Chasen, F.N. 1937. The birds of Billiton island.Treubia 16: Birds of Borneo, Sumatra, Java and Bali. Oxford University 205–238. Press, UK. del Hoyo, J. & N.J. Collar. 2014. Handbook of the Birds of Piersma, T. & P. Wiersma. 1996. Charadriidae (Plovers). the World and BirdLife International Illustrated Checklist Pp. 384–442 in: Handbook of the Birds of the World, Vol. of the Birds of the World, Vol. 1: Non-passerines. Lynx 3: Hoatzin to Auk (J. del Hoyo, A. Elliot & J. Sargatal, Edicions, Barcelona, Spain. Eds.). Lynx Editions, Barcelona, Spain. Iqbal, M. 2015. Javan Plover Charadrius javanicus on Belitung Setiawan, D., H. Marisa & M. Iqbal. 2016. A note on the Island, a new site for Sumatra (Indonesia). Wader Study shorebirds of the Tanjung Putus Wetlands, Indralaya, 122: 160–162. South Sumatra, Indonesia. Stilt 68: 22–24. Iqbal, M., I. Febrianto & H. Zulkifli. 2011. The occurrence Trainor, C.R. 2011. The waterbirds and coastal seabirds of of the Javan Plover Charadrius javanicus in Sumatra, Timor-Leste: new site records, clarifying residence status, Indonesia. Wader Study Group Bulletin 118: 49–51. distribution and taxonomy. Forktail 27: 63–72. 4/28/2020 Wader Study
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Wader Study
Country United Kingdom - SIR Ranking of United Kingdom Subject Area and Agricultural and Biological Sciences 11 Category Animal Science and Zoology Aquatic Science Ecology, Evolution, Behavior and Systematics H Index
Publisher International Wader Study Group
Publication type Journals
ISSN 20588410
Coverage 2015-ongoing
Scope Wader Study is an international scienti c ornithological journal published by the International Wader Study Group. Wader Study is a dedicated outlet for original research and commentary on all aspects of wader biology, ecology and conservation. It also publishes society related issues, and matters of interest to the wader community. All published scienti c studies (empirical and theoretical) are peer-reviewed and have direct relevance to the ecology and/or conservation of this group of birds. Wader Study also serves as a forum for debate and discussion with contributions dedicated to engaging authors and readers with different backgrounds. The aim of these commentaries is to unite wader enthusiasts around the world, including professionals and amateurs. Wader Study is published three times a year in April, August and December.
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Total Cites Self-Cites Cites per document Year Value 0.2Cites / Doc. (4 years) 2011 0.000 80 Evolution of the total number of citations and journal's Cites / Doc. (4 years) 2012 0.786 self-citations received by a journal's published Cites / Doc. (4 years) 2013 0.779 documents during the three previous years. Cites0 / Doc. (4 years) 2014 0.699 40 Journal Self-citation is de ned as the number of citation Cites / Doc. (4 years) 2015 0.805 2011 2012 2013 2014 2015 2016 2017 2018 from a journal citing article to articles published by the Cites / Doc. (4 years) 2016 0.706 Cites / Doc. (4 years) 2017 0.647 same journal. Cites / Doc. (4 years) 0 CitesCites / Doc./ Doc. (4 (3 y years)ears) 2018 0.629 2011 2012 2013 2014 2015 2016 2017 2018 CitesCites / Doc./ Doc. (3 (2 y years)ears) 2011 0.000 Cites Year Value Cites / Doc. (3 years) 2012 0.786 S lf Cit 2011 0 External Cites per Doc Cites per Doc % International Collaboration
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