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3 documents found tagged seasonal variation [X]
  • Title
    Status and population of vultures in Moyar Valley, southern India
    Type
    Journal Article
    Description
    Four species of vultures were surveyed using road transects in two parts of the Moyar Valley, three of these are Critically Endangered by IUCN criteria and one is Endangered. The vulture study was done for the first time in Nilgiri North Forest Division and Sathyamangalam Tiger Reserve of Moyar Valley to determine the flock size in the three species of vultures and also to get a rough estimation of vultures. The results show higher flock size and higher densities in Nilgiri North Forest Division than in Sathyamangalam Tiger Reserve and the most numerous of these was the White-rumped Vulture. There is also evidence of seasonal movements in Nilgiri North Forest Division. These data represent the first systematic survey results from the area and demonstrate the significance of the Moyar Valley for all four Endangered vulture species, probably the main stronghold remaining in southern India. They are White-rumped Vulture Gyps bengalensis, Indian Vulture Gyps indicus, Red-headed Vulture Sarcogyps calvus and Egyptian Vulture Neophron percnopterus. The study recommends that immediate long-term conservation efforts should be taken to save the Critically Endangered vultures in the Moyar Valley.
    Attribution
    Venkitachalam R., Senthilnathan S. (2016). Journal of Threatened Taxa 1(8) pp. 8358-8364; doi:10.11609/jott.2522.8.1.8358-8364
  • Title
    Distribution and abundance of pit vipers (Reptilia: Viperidae) along the Western Ghats of Goa, India
    Type
    Journal Article
    Description
    The distribution and abundance of pit vipers in the Western Ghats namely Trimeresurus gramineus (Bamboo Pit Viper), T. malabaricus (Malabar Pit Viper) and Hypnale hypnale (Hump-nosed Pit Viper) was investigated in five wildlife sanctuaries of Goa from 2005 to 2009. Seasonal day-night data was collected based on band transect methods. All the pit viper species showed specific habitat preferences and their abundance changed with season. They were most abundant during monsoon. H. hypnale extended its range to the adjoining cashew plantations during the post monsoon and winter.
    Attribution
    Sawant N.S., Jadhav T.D., Shyama S.K. (2010). Journal of Threatened Taxa 10(2) pp. 1199-1204; doi:10.11609/JoTT.o2489.1199-204
  • Title
    Species composition and seasonal variation of butterflies in Dalma Wildlife Sanctuary, Jharkhand, India
    Type
    Journal Article
    Description
    Dalma Wildlife Sanctuary is located 10km from Jamshedpur in Jharkhand, India. The species composition and seasonal variation of butterflies was analyzed in this sanctuary over the course of 2 years. A total of 39 species belonging to 31 genera and 4 families were identified. Of these, Nymphalidae and Pieridae were found to be the dominant families, in comparison to Lycaenidae and Papilionidae. The monthly diversity was calculated by using the Shannon-Weiner diversity index. The highest diversity was found during late winter and spring while a comparatively low diversity was observed during the rainy season and summer. Nymphalidae showed the greatest variation with respect to distribution of species richness throughout the year. Nymphalidae and Lycaenidae showed greatest species richness and relative abundance during the rainy season. Little seasonal variation in species richness was observed in case of families Pieridae and Papilionidae
    Attribution
    Verma S.K. (2009). Journal of Threatened Taxa 5(1) pp. 295-297; doi:10.11609/JoTT.o2126.295-7