Daily survival rate of Painted Stork (Mycteria leucocephala) nests from four different nesting colonies in northern India (Delhi Zoo, Keoladeo National Park, Chhata and Khanpur) were modeled as a function of multiple covariates. These included nest and colony specific parameters, year, daily maximum and minimum temperatures and sizes of foraging wetlands in the vicinity. A total of 1,095 Painted Stork nests (606 from 2013–2014 and 489 nests from 2014–2015) were monitored at an interval of 4–7 days during a study spanning two breeding seasons. Considerable variations were observed in annual nest survival due to the amount of rainfall and hence availability of suitable wetlands for foraging in the vicinity of the colony. Nest survival was strongly dependent upon nest age in that nests built early in the season had a higher survival probability (βNest age = 1.13, SE = 0.16). Daily survival rate was higher for nests located in high nest density colonies (βnest density = 0.64, SE = 0.04). The additive effect of daily minimum temperature on the nest survival rate was positive (βTemp. min = 1.21, SE = 0.26) indicating that lower temperatures in winter negatively influenced daily survival rate. Nest survival in Painted Stork is significantly affected by environmental factors like rainfall and daily minimum temperature, besides colony specific parameters such as nest density.
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Vol. 39 • No. 2