Treubia 43: 71–78, December 2016 MORPHOMETRIC AND MOLT OF THE CRESCENT-CHESTED BABBLER (STACHYRIS MELANOTHORAX) IN CISARUA FOREST, WEST JAVA Fransisca Noni Tirtaningtyas*¹,³, Yeni Aryati Mulyani¹, Dewi Malia Prawiradilaga², Joseph Adiguna Hutabarat³, Iis Sabahudin³ 1Department of Forest Resources Conservation and Ecotourism, Faculty of Forestry, Bogor Agricultural University, Kampus IPB Darmaga, Bogor 16680 Indonesia 2Museum Zoologicum Bogoriense, Research Center for Biology, Indonesian Institute of Sciences (LIPI) Jl. Raya Jakarta-Bogor Km 46 Cibinong 16911, Indonesia ³ GAIA-DB Consulting, The CEO Building, Level 12. Jl. TB Simatupang No.18C, Jakarta Selatan 12430, Indonesia *Corresponding author: [email protected] Received: 9 August 2016; Accepted: 5 December 2016 ABSTRACT Crescent-chested Babbler is endemic to the island of Java and Bali, Indonesia and protected by the Indonesian Government Regulation No. 7/ 1999. Its population is suspected to be declining due to ongoing habitat destruction and fragmentation. Information on its eco-biology is very poorly known. There is a need to obtain the information in order to conserve this species and its habitat. Morphometric and molt stages were recorded from 23 individuals captured by mist-nets between February and April 2016. There were variations in morphometric measurement in weight, head bill length, wing length and tail length in Cisarua Forest habitat, but no significant difference was found (F = 0.822, P> 0.05) in body weight among the 2.19 three different habitats. This habitat has sufficient resource for Crescent-crested Babbler for molt activity during the study. Key words : Morphometric, molt, Stachyris melanothorax, West Java INTRODUCTION Crescent-chested Babbler (Stachyris melanothorax (Temminck, 1823)) is endemic to the islands of Java and Bali, Indonesia and is protected by the Indonesian Government regulation No. 7/ 1999. This is a small bird with a total length of approximately 126 mm, bill length of 14 mm, and legs of 21 mm (Prawiradilaga et al. 2003). It has short bright chestnut wings and crown, pale grey cheeks, white throat with black patch on sides, and small crescent on breast (Fig. 1). It is a secretive bird that remains hidden in dense undergrowth, dense thickets and thick shrub (MacKinnon et al. 2010, Collar & Robson 2016). Its population is allegedly to be decreasing due to habitat destruction and fragmentation, although no quantification of the population has been made (Birdlife International 2016), and information on its bio-ecology is still lacking. Morphological characters reflect bird adaptation to its habitat. Bird morphology affects foraging behaviour of the bird in certain environment (Martin & Karr 1990), which in turns will influence its survival. Molt is an event in the life of birds when food is abundant, because molt is energetically expensive (Chai 1997). This paper is aimed at describing morphometric and molt of Crescent-chested Babler inhabiting a block of forested land in Cisarua, West Java. 71 Treubia 43: 71–78, December 2016 Figure 1. Crescent-chested Babbler Stachyris melanothorax 72 Tirtaningtyas et al.: Morphometric and molt of the crescent-chested babbler……... Treubia 43: 71–78, December 2016 MATERIALS AND METHODS Data on morphometric and molt stages were obtained from six mist-netting activities conducted from February to April 2016 in secondary forest, mixed forest and agroforestry coffee. The secondary forest composed of four strata with Castanopsis acuminatissima as the most dominant tree, other dominant plants are Elatostema acuminatum, Diplazium pallidum, and Lasianthus stercorarius. The mixed forest composed of three strata with Calliandra calothyrsus as the most dominant tree, other dominant plants are Acyranthes aspera, Oplismenus compositus, and Nephrolepis biserrata. The agroforestry coffee composed of four strata with Pinus merkusii as the most dominant tree; other dominant plants are Eupatorium riparium, Ichanantus pallens, Diplazium pallidum, and Coffea arabica. The height of nets was 2.5-3.0 m, five shelves, 30 mm mesh size and were set up 0-1.0 m above the ground, depending on the site conditions. The total net hours were 28,850 net hours in three habitats (secondary forest: 10,595 net hours; mixed forest: 8,769 net hours; agroforestry coffee: 9,486 net hours). The study was conducted in a block of lowland forest in West Java that has been exposed to high anthropogenic activities, such as logging in the past, agricultural land and conversion for settlement. This area consisted of a production forest and protected forest, both managed by Perum Perhutani (State owned enterprise managing State Forests) regional division of West Java and Banten. It is located at 1,200-1,700 m a.s.l. with an annual rainfall of about 3,555 mm/year. The average highest temperature recorded in June was 26.28°C, whilst the lowest average temperature recorded in January was 25.08°C (BMKG 2016). The morfometric data consisted of weight, head-bill length, wing length and tail length. The age was determined by colour of body parts, type of feathers and gape color. Adult birds were characterised by white patch throat with black edges, whitish supercilium, bright chestnut wings and crown, olive-brown back and tail, grey cheeks, the occurrence of brood patch or eggs in oviduct, and having rounded tail tips. Juvenile bird was identified from the yellow gape, whitish supercilium, whitish ear coverts and cheek, and having pointed tail tips (Lowe 1989). Crescent- chested Babbler does not show sexual dimorphism nor sexual dichromatism; therefore effort to identify sex was done by palpating the abdomen to check the occurrence of eggs. Molt was checked by examining primary wing feathers and was scored from 0 (old feather) until 5 (new feather) following Ginn and Melville (1983). Primary molt was scored on one wing only, so the sum of molt score ranges from 0 to 50. Figure 1. Crescent-chested Babbler Stachyris melanothorax 72 73 Treubia 43: 71–78, December 2016 RESULTS Twenty-three individuals of Crescent-chested Babbler were marked and examined out of 153 individual birds (15%) of 32 species captured during mist-netting sessions. The Crescent- chested Babbler consisted of 22 adult birds and single juvenile bird. The number of individuals captured was highest in secondary forest (12 adult individuals), followed by mixed forest (7 adults and 1 juvenile), and coffee agroforestry (3 adults). There were 11 individuals (47.8%) of Crescent- chested Babbler showing brood patch, and 9 of them (39.1%) were having eggs. There were variations in body weight of Crescent-chested Babbler among the three different habitats although no significant difference was found (F = 0.822, P> 0.05), and from the range 2.19 variation of head-bill length, wing length and tail length, there was no difference in size between three different habitats (Table 1). Table 1. Morphometric measurement of Stachyris melanothorax in Cisarua Forest (n=23) in three habitat types from February-April 2016 Range variation (means ± SD) Morphometric Mixed Forest Secondary Forest (n=11) Agroforestry coffee (n=3) (n=8) Weight (g) 12-16 (13.7 ± 1.2 ) 11-17 (14.1 ± 2.0) 14-16 (15.0 ± 1.0) Head-Bill length (mm) 30.2-32.9 (31.8 ± 0.9) 31.0-34.1 (32.13 ± 1.1) 31.7-32.6 (32.1 ± 0.5) Wing Length (mm) 55-61 (57.8 ± 2.2) 57-62 (58.5 ± 1.5) 57-59 (58.0 ± 1.0) Tail Length (mm) 50-57 (54.2 ± 2.3) 50-57 (54.3 ± 2.4) 52-54 (53.0 ± 1.0) Jan Feb Mar Apr Figure 2. Scattered plot of molt score of Crescent- chested Babler Stachyris melanothorax. The y-axis showed the total numbers of molt score 74 Tirtaningtyas et al.: Morphometric and molt of the crescent-chested babbler……... Treubia 43: 71–78, December 2016 Molt data were obtained from 22 adult birds and a single juvenile bird. Primary wing feathers RESULTS Twenty-three individuals of Crescent-chested Babbler were marked and examined out of were examined for molt and scored. Crescent-chested Babbler had new feathers in February until 153 individual birds (15%) of 32 species captured during mist-netting sessions. The Crescent- April (n=17), two individuals had growing feathers in February and three individuals had old chested Babbler consisted of 22 adult birds and single juvenile bird. The number of individuals feathers in March (Fig. 2). DISCUSSION captured was highest in secondary forest (12 adult individuals), followed by mixed forest (7 adults The study found that over 90% of caught individuals were adults. This is contrasting to other and 1 juvenile), and coffee agroforestry (3 adults). There were 11 individuals (47.8%) of Crescent- studies that found mist net method is more likely to catch young individuals. Adult birds that are chested Babbler showing brood patch, and 9 of them (39.1%) were having eggs. more experienced than the young ones may avoid mistnets when they heard the alarm call from There were variations in body weight of Crescent-chested Babbler among the three different other bird already caught in the mist net (DoméNech & Strings 1997; Gutiérrez and Pritchard 1990; habitats although no significant difference was found (F = 0.822, P> 0.05), and from the range 2.19 Noske et al. 2011). The high numbers of adult birds in this study might relate to the territorial variation of head-bill length, wing length and tail length, there was no difference in size between behavior during breeding season. There is very limited information on breeding biology of this three different habitats (Table 1). species, but if only females incubate then the suggested sex ratio would be approximately 1:1 (Zacharias 1978). Crescent-chested Babbler may breed the whole year round except July Table 1. Morphometric measurement of Stachyris melanothorax in Cisarua Forest (n=23) in three habitat types from (Prawiradilaga 2004; Collar and Robson 2016), and we found 47.8% birds with brood patch in February-April 2016 February until April. Range variation (means ± SD) Research by Zduniak & Yodep (2004) of birds in sub tropic found that adults of Graceful Morphometric Mixed Forest Warbler (Prinia gracilis) were often captured in the spring because they defend their territory during Secondary Forest (n=11) Agroforestry coffee (n=3) (n=8) breeding season from young individuals who enter their territory. Foster (2001) also found that the Weight (g) 12-16 (13.7 ± 1.2 ) 11-17 (14.1 ± 2.0) 14-16 (15.0 ± 1.0) Head-Bill length (mm) 30.2-32.9 (31.8 ± 0.9) 31.0-34.1 (32.13 ± 1.1) 31.7-32.6 (32.1 ± 0.5) breeding female of Crescent Honeyeater (Phylidonyris pyrrhoptera) more frequently spent time in Wing Length (mm) 55-61 (57.8 ± 2.2) 57-62 (58.5 ± 1.5) 57-59 (58.0 ± 1.0) the lower strata than the non- breeding female in spring. Tail Length (mm) 50-57 (54.2 ± 2.3) 50-57 (54.3 ± 2.4) 52-54 (53.0 ± 1.0) The body weight of Crescent-chested Babbler did not differ among habitats. Changes in body weight can indicate environmental conditions of the species in these habitats. Small body weight during cold weather or very thin body weight may indicate a lack of food or indicate a poor environment. High body weight in high predation risk places will probably indicate a good environment (Brown & Brown 1998, MacLeod et al. 2007, Creswell 2009). Therefore, monitoring changes in body weight through mist nets method is important to assess environmental quality (Cresswell 2009). The molt data showed the progress of molting season and the duration of molt in an individual bird (Ginn & Melville 1983). Table 1 showed that Crescent-chested Babbler has new feathers from February until April. Besides the birds molt in February and March, one individual had the brood patch in February during active molting. Jan Feb Mar Apr Birds in good weight have ability for more rapid molt and frequency (Senar et al. 1998, Senar et al. 2002, Lind & Jakobsson 2001). Molt is an important process in avian life histories, and it needs careful regulation in timing because it consumes high energy. The process of molting and the Figure 2. Scattered plot of molt score of Crescent- chested Babler Stachyris melanothorax. The y-axis showed the total numbers of molt score 74 75 Treubia 43: 71–78, December 2016 growth of new feathers require high energy, so that the birds will usually set the time of molt when the environmental condition ensures sufficient resources. Fogden (1972) and Poulin et al. (1992) showed that tropical birds avoid molt and breeding at the same time during food depletion. Based on molting time of the Crescent-chested Babbler, which occurred between February and April at Cisarua Forest, it can be assumed that there are sufficient resource for birds. The availability of sufficient resources allows birds to molt and breed (Howell 1999). Some tropical birds have records of molt and breeding overlaps (Miller 1961). Habitat should provide adequate food for the birds during breeding season: pre nesting, nest construction, incubation until nestlings. If the habitat lacks of food, bird would delay the breeding period due to poor body condition (Bortolotti et al. 2002). However the Crescent-chested Babbler may breed the whole year and the study found some of this species was breeding. It means that Cisarua Forest provided sufficient food availability, such as spider (Araneae) and insect (Collar and Robson 2016) to support the breeding season.The research on female Willow Flycatchers (Empidonax traillii) showed that bird needs to consume energy more during incubation than during nest construction (pre nesting) and care for nestlings (Ettinger and King 1980). It is important for the local government of this site to monitor and save the habitat of the Crescent-chested Babbler by keeping understory plant growth as feeding grounds. However small sample size in this study should be interpreted carefully. A long term mist-netting study will be beneficial to reveal molt and breeding pattern of this species. ACKNOWLEDGMENTS The authors would like to thank Perhutani Bogor, Lembaga Masyarakat Desa and Kelompok Tani Hutan from Tugu Utara, Bogor Agricultural University, Indonesian Bird Banding Scheme, The Indonesian Institute of Sciences (LIPI), Gaia – dB Consulting Company, Indonesian Agency for Meteorology, Climatology and Geophysics, the research assistants: Entol Mochamad Afnan, Abdu Rohman, Zulfikar Abdullah, Waskito Kukuh Wibowo, Yanuar Ishaq Dwi Cahyo, Bagus Chandra Hermawan. We indebted to anonymous reviewers of an earlier paper for providing insightful comments and directions for additional work to improve the manuscript. 76 Tirtaningtyas et al.: Morphometric and molt of the crescent-chested babbler……... Treubia 43: 71–78, December 2016 REFERENCES growth of new feathers require high energy, so that the birds will usually set the time of molt when Birdlife International. 2016. Species factsheet: Stachyris melanothorax. 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