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Saxicola Caprata) Етологія Беркут 21 Вип. 1-2 2012 116 - 126 OBSERVATIONS ON THE BREEDING BEHAVIOUR OF THE PIED BUSH CHAT (SAXICOLA CAPRATA) Vinaya Kumar Sethi, Dinesh Bhatt, Amit Kumar Gurukula Kangri University, Dep. of Zoology and Environmental Science, Avian Diversity and Bioacoustics Lab.; Haridwar, 249404, Uttarakhand, India D. Bhatt, e-mail: [email protected] Abstract. Understanding the life history events is a crucial factor in developing conservation and management approaches for any avian species. Nevertheless such studies on the avifauna of the Indian subcontinent are scanty. This paper deals with the breeding behaviour of the tropical avian species, the Pied Bush Chat, observed during 2008–2009 in district Haridwar, Uttarakhand state, India. Breeding activities commenced with the advent of spring (in late February) and continued till July. The peak in breeding activity (availability of maximum clutches) was observed in May. Males were found highly territorial during breeding season and delivered dawn chorus with immediate variety. Dawn chorus seemed to play a role mainly in maintenance and adjustment of social relationship among neighbouring males. Nest-site selection was performed by both the sexes and only female built the nest. Nest was a cup of grass and rootlets lined with finer grass and animal hair. Clutch size averaged 3.67 ± 0.47. Only females incubated and developed brood patch during incubation. Different factors such as predation, rain water overflow in nest, hatching failure were found responsible for the loss of eggs/young ones. Nestlings and fledglings delivered begging and contact calls respectively for being fed from parents. Both sexes fed the young and delivered alarm call on observing any predator nearby the nesting area. We observed pairs nesting in partially-developed human settlements also suggesting scarcity of natural nesting habitat due to urbanization in the study area. Key words: breeding ecology, habitat, clutch, egg, song, incubation. Наблюдения за гнездовым поведением черного чекана (Saxicola caprata). - В.К. Сети, Д. Бхатт, А. Кумар. - Беркут. 21 (1-2). 2012. - Исследования проводились в округе Харидвар (штат Уттараханд, Индия) в 2008–2009 гг. Гнездовой сезон чеканов продолжался с конца февраля до июля. Пик гнездовой активности (максимум кладок) приходился на май. Каждая пара имела 2–3 кладки в сезон. У самцов вы- ражена территриальность. Место для гнезда выбирали оба партнера, но строила его только самка. Гнездо в виде чаши из травы и корешков с выстилкой из тонких травинок и волос. Самка откладывала 3 или 4 яйца. Средние размеры яиц 17.41 ± 0.35 × 13.58 ± 0.19 мм (n = 16), вес свежеснесенного яйца – 1.64 ± 0.09 г (n = 54). Средний размер кладки 3.67 ± 0.47 яйца. Насиживала их только самка. Птенцы вылуплялись в один день. Потери яиц и птенцов были связаны с хищничеством, затоплением гнезд во время дождей, гибелью эмбрионов во время насиживания. Кормили птенцов оба родителя. Выделены 94 типа песни (12 самцов). Introduction are responsible for the differences in breed- ing parameters between species (Dowling, Behavioural studies on birds have sig- 2003). Besides this, understanding the life nificant potential to contribute to a number of history events is a crucial factor in developing questions related to ornithology (Virolainen, conservation and management approaches for 1984; Sherry, Holmes, 1992). That is, ornitho- any avian species (Kitowski, Pawlega, 2010). logical science can develop and mature mainly Unfortunately, studies on the behavioural ecol- by the collection and proper interpretation of ogy of the avifauna of the Indian subcontinent data collected in the field on different aspects are scanty (Sharma et al., 2004; Sethi, Bhatt, of birds’ life (Nolan, 1978). For example, 2008). Consequently, we largely lack funda- studies on the breeding behaviour of a species mental data on behavioural ecology of most provide insights in to the selection pressures of the Indian avian species. that individuals of that species have faced over This paper aims to fill one of these gaps time. Long term and systematic data on the through studying some aspects of the breeding breeding ecology of unstudied species make behaviour of a tropical avian species, the Pied it possible to conduct comparative tests with Bush Chat (Saxicola caprata) under natural the studied ones to determine what factors conditions. © V.K. Sethi, D. Bhatt, A. Kumar, 2012 Вип. 1-2. 2012. Breeding behaviour of the Pied Bush Chat 117 Photo 1. Ringed individuals of Pied Bush Chat: (A) Female and (B) Male. Фото 1. Окольцованные особи черного чекана: (A) самка и (B) самец. Materials and Methods Intersexual colour difference found in the Pied Bush Chat was of considerable help in Study Species the collection and interpretation of field data The Pied Bush Chat (Order Passeriformes, on various breeding related aspects such as Family Muscicapidae, Photo 1) is a tropical nest site selection, nest building, incubation, songbird that occurs discontinuously from parental provisioning etc. Behaviour of indi- Transcaspia and the Indian subcontinent to viduals was observed using 8 × 50 prismatic South-East Asia, the Philippines, Indonesia, field binocular (Nikon) and still camera (Nikon New Guinea and New Britain (Ali, Ripley, FM 3A with 300 mm zoom lens). 2001). The male is black except for a white Individuals were ringed for unique identity rump, wing patch and lower belly along with (Photo 1). Territories were mapped by noting dark brown iris. The female is dull brown locations of singing and boundary encounters. and slightly streaked (Grimmett et al., 1998). Songs of male were recorded using Sennheiser This species is insectivore and found in open ME 67 directional microphone and Marantz habitats. Males use dawn chorus from their PMD 670 portable solid state sound recorder. respective territories during the breeding Spectrograms were prepared with Avisoft season (Ali, Ripley, 2001; Sethi et al., 2011a). SASLab Pro 4.1 software (Specht, 2002). Females also deliver songs and the structure Close observations were made to record dif- and contexts of female song in this species ferent breeding activities such as nest site have also been described (Sethi et al., 2012). selection, egg laying, incubation, parental pro- This species appears to be socially monoga- visioning, behaviour of young ones etc. Eggs mous (Bell, Swainson, 1985). were measured and weighed within 24 hrs of laying. Clutch size was defined as the number General Methodology of eggs laid by a female in single breeding at- We observed breeding behavior of the tempt. Incubation period was considered to be Pied Bush Chat during 2008–2009 in district the time elapsed between the laying of the last Haridwar (29° 55΄ N and 78° 08΄ E), Uttara- egg of the clutch and hatching of the last young khand state, India. Field visits were carried (Skutch, 1945). Nestling period was defined out generally on alternate days or as required as the time lapsed between hatching of the for recording different breeding activities. first young and fledging of all young in nest. 118 V.K. Sethi et al. Беркут 21. Photo 2. Habitats of the Pied Bush Chat: (A) natural landscape and (B) partially-developed human settlements. Фото 2. Гнездовые биотопы черного чекана: (A) природный ландшафт и (B) строящиеся поселения. Attempts were also made to understand the New Guinea, breeding season of the species cause of egg/young loss. Data were analyzed extends over a period of seven months from following standard statistical tests (Zar, 1999). July to January (Bell, Swainson, 1985). In the Results are reported as mean ± SD. present study, although availability of insect food for the nestlings in April – May (when Results and Discussion early breeder rear their young) did not seem abundant as in the June – July (monsoon pe- Breeding season riod), early breeding in the season might be The breeding activities of Pied Bush Chat adaptive in acquiring better nesting sites. commenced with the advent of spring in India (late February) and continued till July. Female Habitat of the Pied Bush Chat started adding nesting material to nest site in The species was found in open habitats the first week of March. Building of the first including scrub, grassland and cultivated nest started on 6 March and 9 March in 2008 fields (Photo 2A). Similar habitat features and 2009 respectively. Dates of laying of the for the Pied Bush Chat have been reported first egg were 14 March and 19 March in 2008 by other workers also (Bell, Swainson, 1985; and 2009 respectively. The peak in breeding ac- Ali, Ripley, 2001). Besides, we observed four tivity (availability of maximum clutches) was pairs nesting in partially-developed human set- observed in May as maximum clutches (35%) tlements also (Photo 2B). Two of these nests were observed in the month of May alone. were built even inside the half built houses. Males were found highly territorial during The reason of inhabiting human populated breeding season. Territory size ranged from sites by a wild species seemed to be related 2249.2 m2 to 5447.4 m2 with an average of with the scarcity of micro habitat for nesting. 4018.5 ± 860.4 m2 (n = 17). Each pair produced During this study, we witnessed rapid trend two to three broods probably due to the long of urbanization in the study area engulfing breeding season. Ali (1996) and Grimmett large portion of the open lands (habitat of et al. (1998) have also reported almost the Pied Bush Chat). The species tried to cope same length of breeding season for the Pied with this habitat modification through nesting Bush Chat. However, in Port Moresby, Papua inside human settlements. However, this does Вип. 1-2. 2012. Breeding behaviour of the Pied Bush Chat 119 not ensure the survival of this bird for a long time. For example, in 2008 only four pairs bred inside half built houses, but in the successive year (2009) no pair was observed nesting inside these houses because humans had started to live Spectrogram of a song type of male Pied Bush Chat.
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