Leading up to the National Moth Week on July 22, we interview some contributors of moth observations.Listen to the first podcast episode with Nagesh O. S. on the IBP blog.

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1 document found tagged monitoring station [X]
  • Title
    Metropolitan garbage dumps: possible winter migratory raptor monitoring stations in peninsular India
    Type
    Journal Article
    Description
    Winter raptor migration and movement is poorly documented for peninsular India, mainly due to the lack of geographical bottlenecks. We describe, for the first time, the use of a garbage dump in a metropolitan city as an alternative visual winter raptor monitoring station. The daily count, adult to juvenile ratios and species composition of three migratory raptor species, Steppe Eagle Aquila nipalensis, Black-eared Kite Milvus migrans lineatus and Tawny Eagle Aquila rapax are presented. Ground temperatures at the garbage dump site and surrounding area, and the wing beat rate of migratory raptors before and after arrival in the early morning were measured. A total of 355 raptors migrating over a period of six observation days with 250 adults and 105 juveniles were recorded. The temperature of the garbage dump was significantly higher than the surrounding area, while the wing flapping rate was significantly lower over the garbage dump area. It is possible that migrating raptors use garbage dump thermals in the early morning to save energy with soaring and gliding flight (versus flapping flight). We propose that such sites may be used as visual winter migration monitoring stations in metropolitan cities in peninsular India.
    Attribution
    Pande S., Pawashe A., Sant N., Mahabal A., Dahanukar N. (2010). Journal of Threatened Taxa 10(2) pp. 1214-1218; doi:10.11609/JoTT.o2403.1214-8