Bhrigu Prasad Saikia - Academia.edu (original) (raw)
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Papers by Bhrigu Prasad Saikia
Chinese pangolin is a least known species in terms of its ecology and population status in India.... more Chinese pangolin is a least known species in terms of its ecology and population status in India. The present study of Chinese pangolin in Kaziranga-Karbi-Anglong landscape aimed to gather information on species distribution and population status and also an account of threats of the species was investigated. A total of 24 occurrence points were collected from all over Assam and used to get a predictive potential distribution map for the species via Maxent and Random Forest models. To understand the knowledge level of the local people, a total of 13 villages in the north east boundary of North Karbi Anglong Wildlife Sactuary have been surveyed and 160 respondents were interviewed. The AUC values for the two models namely Maxent (0.736) and Random Forest (0.87) were different. Out of the six environmental parameters chosen, the altitude clarified the maximum variation in the model (62 %) followed by the seasonal temperature (bio4; 19.6 %) in the Maxent model. At the same time, these ...
Ecology, Environment and Conservation, 2023
Ichthyofaunal diversity in Jia Bharali River of Assam, Northeast India, has been carried out from... more Ichthyofaunal diversity in Jia Bharali River of Assam, Northeast India, has been carried out from September 2018 to March 2021. The study emphasized the documentation of fish faunal diversity in relation to water parameters of previously undocumented ecological pockets of Himalayan foothill zones of north-bank landscapes of Assam. Study revealed altogether 69 fish species belonging to 6 orders and 20 families in Jia Bharali River. Cypriniformes was the most dominant (42 species) order followed by Siluriformes (14 species), Perciformes (8 species), Synbranchiformes (3 species), whereas, Beloniformes and Clupeiformes support one species each. The highest species diversity was found in Site-1 (H' = 3.76) whereas, in terms of seasons, the highest species diversity was found in retreating monsoon (H' = 3.80). Among the 69 species of fish, 56 species (81.16%) were IUCN categorized as Least Concern, 6 were Not Evaluated (8.7%), two species were Near Threatened (2.90%), three were Data Deficient (4.34%), and one species each was Endangered (1.45%) and Vulnerable (1.45%) respectively. Analysis of the relationships between water parameters and ichthyofaunal diversity showed a positive correlation between increasing dissolved oxygen and species richness. Water temperature and pH showed a positive correlation with species abundance in the study area.
Environmental monitoring and assessment, 2017
Spatially explicit approach is essential to prioritise the ecosystems for biodiversity conservati... more Spatially explicit approach is essential to prioritise the ecosystems for biodiversity conservation. In the present study, the conservation status of 20 protected areas of the Western Ghats of Kerala, India, was analysed based on long-term changes in forests (1975-1985-1995-2005-2013), landscape level changes in fragmentation and forest fires (2005-2015). This study has shown that a significant forest loss occurred in protected areas before declaration. Idukki is one of the major protected areas which showed a drastic reduction (18.83%) in its forest cover. During 1985-1995, Periyar tiger reserve had lost 24.19 km(2) core 3 forest area followed by Peppara (18.54 km(2)), Parambikulam (17.93 km(2)), Chimmony (17.71 km(2)), Peechi-Vazhani (12.31 km(2)) and Neyyar (11.67 km(2)). An area of 71.33 km(2) of the protected area was affected by fires in 2014. Overall protected area-wise decadal analysis indicates Periyar has the highest number of fire incidences followed by Wayanad, Kurinjima...
Scientific Reports, 2021
The present study aimed at predicting the potential habitat of Western Hoolock Gibbon (Hoolock ho... more The present study aimed at predicting the potential habitat of Western Hoolock Gibbon (Hoolock hoolock) in the upper Brahmaputra River Valley, Assam, India, and identifying priority conservation areas for the species, taking canopy cover into account. We used the maximum entropy algorithm for the prediction of the potential habitat of the gibbon using its current distribution with 19 environmental parameters as primary predictors. Spatio-temporal analyses of the habitat were carried out using satellite-based remote sensing and GIS techniques for two decades (1998–2018) along with Terra Modis Vegetation Continuous Field product to examine land use land cover (LULC), habitat fragmentation, Normalized Difference Vegetation Index (NDVI) and tree cover percentage of the study area. To identify the conservation priority area, we applied a cost-effective decision-making analysis using systematic conservation prioritization in R programming. The model predicted an area of 6025 km2 under hig...
Chinese pangolin is a least known species in terms of its ecology and population status in India.... more Chinese pangolin is a least known species in terms of its ecology and population status in India. The present study of Chinese pangolin in Kaziranga-Karbi-Anglong landscape aimed to gather information on species distribution and population status and also an account of threats of the species was investigated. A total of 24 occurrence points were collected from all over Assam and used to get a predictive potential distribution map for the species via Maxent and Random Forest models. To understand the knowledge level of the local people, a total of 13 villages in the north east boundary of North Karbi Anglong Wildlife Sactuary have been surveyed and 160 respondents were interviewed. The AUC values for the two models namely Maxent (0.736) and Random Forest (0.87) were different. Out of the six environmental parameters chosen, the altitude clarified the maximum variation in the model (62 %) followed by the seasonal temperature (bio4; 19.6 %) in the Maxent model. At the same time, these ...
Ecology, Environment and Conservation, 2023
Ichthyofaunal diversity in Jia Bharali River of Assam, Northeast India, has been carried out from... more Ichthyofaunal diversity in Jia Bharali River of Assam, Northeast India, has been carried out from September 2018 to March 2021. The study emphasized the documentation of fish faunal diversity in relation to water parameters of previously undocumented ecological pockets of Himalayan foothill zones of north-bank landscapes of Assam. Study revealed altogether 69 fish species belonging to 6 orders and 20 families in Jia Bharali River. Cypriniformes was the most dominant (42 species) order followed by Siluriformes (14 species), Perciformes (8 species), Synbranchiformes (3 species), whereas, Beloniformes and Clupeiformes support one species each. The highest species diversity was found in Site-1 (H' = 3.76) whereas, in terms of seasons, the highest species diversity was found in retreating monsoon (H' = 3.80). Among the 69 species of fish, 56 species (81.16%) were IUCN categorized as Least Concern, 6 were Not Evaluated (8.7%), two species were Near Threatened (2.90%), three were Data Deficient (4.34%), and one species each was Endangered (1.45%) and Vulnerable (1.45%) respectively. Analysis of the relationships between water parameters and ichthyofaunal diversity showed a positive correlation between increasing dissolved oxygen and species richness. Water temperature and pH showed a positive correlation with species abundance in the study area.
Environmental monitoring and assessment, 2017
Spatially explicit approach is essential to prioritise the ecosystems for biodiversity conservati... more Spatially explicit approach is essential to prioritise the ecosystems for biodiversity conservation. In the present study, the conservation status of 20 protected areas of the Western Ghats of Kerala, India, was analysed based on long-term changes in forests (1975-1985-1995-2005-2013), landscape level changes in fragmentation and forest fires (2005-2015). This study has shown that a significant forest loss occurred in protected areas before declaration. Idukki is one of the major protected areas which showed a drastic reduction (18.83%) in its forest cover. During 1985-1995, Periyar tiger reserve had lost 24.19 km(2) core 3 forest area followed by Peppara (18.54 km(2)), Parambikulam (17.93 km(2)), Chimmony (17.71 km(2)), Peechi-Vazhani (12.31 km(2)) and Neyyar (11.67 km(2)). An area of 71.33 km(2) of the protected area was affected by fires in 2014. Overall protected area-wise decadal analysis indicates Periyar has the highest number of fire incidences followed by Wayanad, Kurinjima...
Scientific Reports, 2021
The present study aimed at predicting the potential habitat of Western Hoolock Gibbon (Hoolock ho... more The present study aimed at predicting the potential habitat of Western Hoolock Gibbon (Hoolock hoolock) in the upper Brahmaputra River Valley, Assam, India, and identifying priority conservation areas for the species, taking canopy cover into account. We used the maximum entropy algorithm for the prediction of the potential habitat of the gibbon using its current distribution with 19 environmental parameters as primary predictors. Spatio-temporal analyses of the habitat were carried out using satellite-based remote sensing and GIS techniques for two decades (1998–2018) along with Terra Modis Vegetation Continuous Field product to examine land use land cover (LULC), habitat fragmentation, Normalized Difference Vegetation Index (NDVI) and tree cover percentage of the study area. To identify the conservation priority area, we applied a cost-effective decision-making analysis using systematic conservation prioritization in R programming. The model predicted an area of 6025 km2 under hig...