Browsing by Author "Bhattacharya, T."

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    Assessment of impacts on wildlife of Kedarnath Musk deer sanctuary due to helicopter services
    (WII and Uttarakhand State Forest Department, 2017) Sathyakumar, S.; Bhattacharya, T.; Arya, S.; Iyer, B.; Kumar, Arun; Kumar, A.; Mondal, K.; Umapathy, G.; Mathur, V.B.
    The Kedamath shrine is an important and famous Hindu religious site situated at 3 583 m near the source of the Mandakini River in Uttarakhand. For centunes, large numbers of pilgrims visit the shrine in the summer months. The stretch between Gaurikund and Rambara of the pilgrim route passes through the Kedarnath Musk Deer Sanctuary (WS). Helicopter services were initiated during 2~07 -08 to ferry pilgrims. In June 2013, devastating flash floods swept through the region, and almost half of the old pilgrim route was damaged, and a new slightly longer route was constructed. After 2013, the number of helicopters operating daily flights to Kedarnath shrine increased dramatically. Some of the local residents raised concerns over the potential impact on wildlife of Kedarnath WS due to high intensity sound produced by the helicopters. Based on the request from Uttarakhand State Forest Department, the Wildlife Institute of India carried out a study to assess the impacts of helicopter flights on wildlife of Kedarnath WS and to suggest mitigation measures. The Mandakini valley was selected as the main study site, where the helicopter flights operate. The adjacent Kaliganga valley, and Shokharakh area were taken as control sites. The sampling was carried out in Mandakini valley in two different study periods - September to December 2015 and April to June 2016; coinciding with the helicopter flying period. Helicopter aviation data and noise levels in different elevation and habitat types were recorded in the Mandakini Valley to detect wildlife species presence, Trails (n=7) and vantage points (n=2) were sampled, and camera traps (11=23) were deployed. Comparative studies on wildlife species presence in Kaliganga Valley and Shokharkh (control sites) were carried out using trail sampling and camera trapping. Fresh faecal samples of wild mammals were collected from Mandakini Valley and the two control sites to analyse the levels of stress hormone using Enzyme Immuno-Assay procedure at the CCMB-LaCONES, Hyderabad. A detailed literature review was carried out on impacts of aircraft flights on wildlife carried out in different parts of the world to understand likely impacts on wildlife and various mitigation measures proposed. The results showed that May is the month when maximum number of flights operated (305/day) in Mandakini Valley followed by June and October, as Sersi helipad is nearest to Kedarnath, the onward journey to Kedarnath from Sersi reached the lowest mean flight height (152.4 ± 6.11 m). Noise levels recorded from six recording sites in Mandakini valley had a mean well above the 50 dB upper noise limit for silence zones. Negative correlation (R2 = 0.33 and 0.25) was observed between flight height and noise level for open coniferous and broadleaved forest. Presence of 20 mammal species (carnivore-8, ungulate-7, primate-2, rodent- 2, lagomorph-l) and five galliformes species (pheasants-3, partridge-2) has been confined from the study area. In. general, the study area is. already exposed to immense anthropogenic pressure (pilgrimage, constructions, etc) It is very difficult to decouple the effects of helicopter flying and other anthropogenic disturbances. Based on the findings of this study and a perusal of published information on Impacts of aircraft flights on wildlife the following conclusions are arrived at: ' I. All the commo~ wildlife species of Kedarnath WS are present in Mandakini valley. The comparison among the photo-capture rates of different wild animals depicts the consistent use of available habitat in the Mandakini valley despite a high level of helicopter operations. 2. Some wildlife species altered their activity pattern to either crepuscular or nocturnal due to the cumulative effects of anthropogenic pressures in this area mostly in the form of pilgrimage and associated human activities. However, in the case of Himalayan monal pheasant, there was a marginal overlap in peak activity period with that of peak helicopter operations. 3. Results of stress hormone studies are in-conclusive due to low sample sizes. However, the results can be used as baseline for future comparative studies on similar investigations pertaining to helicopter flight impacts on wildlife. 4. Taking the above three observations into consideration, it appears that most of the mammals have adapted to the anthropogenic disturbances in Mandakini valley. However, repeated observations in the future would be needed to draw robust conclusions. 5. There is a high negative correlation between flying height and noise levels and the current levels of noise due to anthropogenic activities and helicopter flights. Thus, prescribing a minimal flight height would be useful to reduce the noise levels. 6. Helicopter sorties ranged from 2 to >300 flights per day in Mandakini Valley. Since most of the mammals appear to have adapted to this level of noise, it should not be allowed to go beyond the current levels of helicopter flights. Therefore, efforts has to be made to ensure that the upper limit for number of flights per day does not exceed 300 flights/day. The study recommends the following measures: 1. Restricting helicopter flight heights to at least 600 m (2000 ') with the exception of take-off and landing times. This would help in reducing noise levels in the area. 2. Monitoring the helicopter operations with regard to adherence to the prescribed heights will be required. This could be done using laser distometers or lidar guns or set up an Automatic Dependent Surveillance-Broadcast (ADS-B) within the Kedarnath Wildlife Sanctuary. Monitoring of impacts of helicopter flights on wildlife could be carried out on a regular basis (every 3 to 5 years) including stress hormone studies so that a comprehensive database can be developed for rigorous statistical analysis 3. As a long-term measure, passenger ropeway for transportation of pilgrims as educe pilgrim foot falls in the trekking path to the shrine and helicopter services. The passenger ropeway will not require building a motorable road through the Kedarnath WS as all the material and machines required for building ropeway could be transported by air using specialized helicopters.