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2 documents found tagged nesting success [X]
  • Title
    The nesting success of the Oriental Darter Anhinga melanogaster (Aves: Suliformes: Anhingidae) in the Yamuna Biodiversity Park, New Delhi, India
    Type
    Journal Article
    Description
    The Oriental Darter Anhinga melanogaster is a globally Near Threatened species that has been breeding in the Yamuna Biodiversity Park, Delhi since 2006.  This is a recently restored site with the help of plant species assemblage in the form of plant communities of the Yamuna River basin and restoration of wetland ecosystems.  A study was carried out during the nesting period of 2011 to assess the nesting success of the Oriental Darter in the park.  A total of eight out of the nine incubated nests (88.88%) were successful with hatchlings and one was abandoned within three weeks of incubation.  An average of 2.87 chicks hatched per nest with 2.1 fledglings per nest.  The males fed the nestlings more than the females during the study hours. The restored landscape, the Yamuna Biodiversity Park and its wetlands provide a suitable habitat for supporting the breeding population of many important birds including the Darter due to the availability of prey species, vegetation for roosting and nesting, and low disturbance leading to optimization of nesting of the Darters.  
    Attribution
    Niangthianhoi S. L., Khudsar Faiyaz A. (2015). Journal of Threatened Taxa 14(7) pp. 8148-8153; doi:10.11609/jott.2430.7.14.8148-8153
  • Title
    Breeding biology of the Grey-headed Bulbul Pycnonotus priocephalus (Aves: Pycnonotidae) in the Western Ghats, India
    Type
    Journal Article
    Description
    The breeding biology of the endemic Grey-headed Bulbul Pycnonotus priocephalus was studied from 2003 to 2005 in Silent Valley National Park, Western Ghats, India. Nests were located during three field seasons from the arrival (December) to the dispersal of the birds (June) and collected data on various breeding parameters, availability of fruits and weather conditions. All nests were found in mid-elevation evergreen forests ranging from 900 to 1,400 m elevation. Breeding occurred in the drier months (January-May), which coincides with high fruit availability. Nest building lasted 3-8 days. Majority of the nests (72%; n = 39) were built on two plant species (Ochlandra travancorica and saplings of Syzygium sp.) and the mean nest height was 1.52 plus or minus 0.80 m (n = 52). Nests were randomly oriented around the nesting plants with a mean vector of orientation equaling 160.450. The clutch size averaged 1.53 plus or minus 0.50 eggs (range = 1-2; n = 47). Incubation and nestling periods were 13 plus or minus 0.87 (n = 9) and 12 plus or minus 0.50 (n = 9) days, respectively. Overall nest success was 10.79%. Nest success rates varied among incubation and nestling periods. Grey-headed Bulbul exhibit life-history traits associated with low productivity such as short breeding season, low clutch size, fewer broods per year and high predation rates indicating that deterioration of breeding habitats might seriously hamper the long-term survival of the species.
    Attribution
    Balakrishnan P. (2011). Journal of Threatened Taxa 1(3) pp. 1415-1424; doi:10.11609/JoTT.o2381.1415-24