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Chestnut-Cheeked Starling Komukudori (Jpn) Agropsar Philippensis

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Chestnut-Cheeked Starling Komukudori (Jpn) Agropsar Philippensis Bird Research News Vol.4 No.9 2007.9.13. Chestnut-cheeked Starling Komukudori (Jpn) Agropsar philippensis Morphology and classification Egg: The egg was solid blue in color Classification: Passeriformes Sturnidae and was 24.4 ± 0.3mm by 18.1 ± 0.1mm (mean ± S.E., n = 13) in Total length: 192mm (183-198) n size. Chestnut-cheeked Starlings Wing length: ♂ 106.76±2.12mm (41) ♀ 104.55±2.36mm (33) laid eggs from late April to early Tail length: ♂ 52.71±2.16mm (41) ♀ 51.36±1.76mm (33) June, but about half of them start- Culmen length: ♂ 19.61±0.63mm (40) ♀ 19.39±0.52mm (33) ed laying in mid-May in Niigata Tarsus length: ♂ 24.09±0.91mm (41) ♀ 23.89±0.95mm (33) City from 1978 to 2005. "Mean Weight: ♂ 46.70±2.77g (38) ♀ 47.22±3.88g (33) first egg-laying date" varied be- Photo 2. The egg and nestlings of tween the years. The clutch size Chestnut-cheeked Starlings Total length after Enomoto (1941). Other measurements are of the breeding period in immediately after hatching. Niigata City (mean ± S.D.) by the author. was 3-9 eggs and a clutch of 5-6 eggs represented more than 70% Appearance: of the clutches. The clutch size decreased as the breeding season Males are white on the head with progressed. They usually laid an egg every day from six to ten a brown patch on the cheek. This o'clock in the morning. The morning egg-laying was also con- patch varies in size between indi- firmed by measuring a difference in temperature between the inside viduals. The back is lustrous and outside of a nest using a temperature logger placed in a fake purple black. The wing and tail egg (Fig. 1). are lustrous greenish black. There 40 the female left the nest due to Fig. 1. Temperatures of is a white part on the shoulder. 35 temperature investigation disturbance The flank is gray and the rump is within the nest the inside and outside 30 of a nest in the egg- pale brown. Females, on the oth- 25 laying period. Hours er hand, are brown all over. The Photo 1. Chestnut-cheeked Star- 20 of a great difference bill and mouth are black both in ling male (left) and female 15 in temperature con- outside temperature males and females. (right). temperatures(℃) 10 centrate in the morn- ing, which shows that 5 Vocalization: 061218066 121806 12180 1218 the female stays in the May 26 May 27 May 28 nest to lay an egg in Chestnut-cheeked Starlings sing like "Kyu-kyu-kyu, pee-pee, (second egg) (third egg) (fourth egg) pippbee-peebibi" for about eight seconds. They sing to attract fe- the morning. males, not to defend their territory. Their call sounds "Gyuk" Incubation and nestling periods and predators: which is lower than White-cheeked Starlings (Spodiopsar cinera- Males and females incubate eggs alternately during the daytime. ceus). During the night, however, only females do. Not only females but also males develop a brood patch (a feather-lost bare skin area) on Distribution and Habitat the abdomen. Males do not feed their partner. The incubation peri- od is 12-13 days, but the eggs begin to hatch 11 days after the last Distribution: egg was laid in more than 50% of the nests because the incubation Chestnut-cheeked Starlings breed north of central Japan (central starts before the clutch is completed. As a result, the nestling that Honshu to Hokkaido), in the southern Kuril Islands as far as south- hatched one day later sometimes grow slowly. Both males and ern Sakhalin. females feed the nestlings. For a while after hatching, the parent birds brood over the nestlings after feeding them. When the nest- Habitat: lings grow up, the parents stop brooding at nighttime as well. They They breed in the woodland of ranches and highlands in the hills, mostly feed larvae of moths to the nestlings, but also give adults of and groves on rivers and fields as well as vegetation-rich back- moths, spiders and grasshoppers to them yards of villages and towns in the lowlands. They prefer an open (Photo. 3). In addition to these inverte- habitat with a mosaic of the woods and meadows. brates, fruits of cherry trees, oleaster (Elaeagnus spp.) and Lonicera morrowii Life history account for 20-30% of the food. The nes- tling period is about 18 days. During the 1 2 3 4 5 6 789101112 incubation and nestling periods, some wintering breeding molting period period period migration nests fall victim to the predation of snakes Photo 3. Male with and weasels (Mustela itatsi). Parent birds Breeding system: larvae and imagoes feed the young for a while after fledging. of moths at the nest. Chestnut-cheeked Starlings arrive at the breeding grounds of Nii- gata City, Niigata Prefecture from early April to early May. They Roost: are monogamous, but they remain their pair-bond for a single Chestnut-cheeked Starlings form a communal roost from summer breeding season alone, and they do not necessarily pair with the to autumn. Although they may roost with a flock of White-cheeked same partner the following year. When they succeed in their first Starlings, they tend to make a single species flock by themselves. breeding attempt, they do not breed for the second time in the They leave the roost for the foraging grounds in a small flock in the same season. morning, but they gradually disperse. Nest: Migration: They nest in tree cavities and often use nest boxes. Both males and Most Chestnut-cheeked Starlings leave the breeding grounds and females build a nest. When old nest materials remain in a nest, head south by the end of September. They travel through the Nan- they carry them out. They mostly use dry pine needles and grass as sei Islands, southernmost Japan, Taiwan and the Philippines to the nest materials, but occasionally add green leaves. They line the northern part of Borneo Island to spend the winter. In spring, they inner cup with finer materials and sometimes place green leaves retrace their migratory route and arrive at the breeding grounds and feathers there as well. from April to May (Brazil 1991). 4 ♪ http://www.bird-research.jp/1_shiryo/koe/komukudori_100610_nikkou.mp3 Toshiaki Hirano Bird Research News Vol.4 No.9 2007.9.13. © Japan Bird Research Association Sumiyoshi 1-29-9, Fuchu, Tokyo, Japan バードリサーチ生態図鑑 Topics of ecology, behavior and conservation respectively. The date was advanced by 15.3 days in 28 years, which corresponds to 0.57 days per year (Fig. 2). In the breeding grounds (Niigata City: 37° 54′ N, 139° 01′E) and the stopover site ● Dispute over a nesting site (Naha City, Okinawa Pref.: 26° 12′ N, 127° 41′E), on the other hand, the temperatures in the early spring (February-April) in- A dispute between males over creased by 1.5°C and 1.1°C in 28 years, respectively. In addition, a nest site is fierce. Nest own- the first egg-laying date is correlated with the temperatures of ers threaten other males intrud- these two areas. There was a tendency for Chestnut-cheeked Star- ing into the territory, fluffing lings to lay eggs early in the years when the temperatures of the their feathers up and calling breeding grounds or stopover site were high. The analyses suggest vigorously. If the intruders that the advanced first egg-laying date was induced by a rise in refuse to leave, the nest owners temperature in the last 30 years as a result of the rapidly progress- attack them fiercely or may ing global warming. Many pairs started breeding in a short span of perch at the nest hole and time with the advanced first egg-laying date. The clutch size also threaten them, with their black increased from 5.0 to 6.1 eggs (Koike & Higuchi 2002, Koike et mouth open. The males occa- al. 2006). sionally fall to the ground, Photo 4. Male Chestnut-cheeked grappling with each other. 22 Once a dispute over territorial Starling singing in front of a nest 46 box. May 25 7 claims has been settled, howev- 17 27 er, neighboring males usually stop fighting. Since the function of a May 20 42 30 territory is to secure a nest site, they do not establish a large terri- 31 59 59 May 15 60 57 tory to acquire the foraging grounds, which allows them to breed 28 15 60 23 28 relatively close together. In the study site, for example, they breed May 10 36 in a territory of about 200m2. It is assumed that this behavioral 31 60 60 60 flexibility contributes to the effective use of insufficient nesting First egg-laying date May 5 sites. May 1 y=22.94－0.57x (1978=0), r =－0.876, P < 0.0001, N = 22. When males have secured a nesting site, they sing vigorously to (One-way ANOVA: F = 48.12, df = 21,836,P < 0.0001) attract females (Photo 4). When females come flying close to 1980 1985 1990 1995 2000 2005 them, they stop singing. They lower the wings slightly and make Fig. 2. Annual changes of first egg-laying date (1978-2005). Figures themselves slender, and then start to sing again, but softly this on the graph are the number of nests studied each year. (modified time. They also perch at the nest hole or go in and out the nest, from Koike et. al. 2006). when they may carry green leaves into the nest in the bill.
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