Wildlife Conservation Plan for the Impact Zone of Etalin HEP, Dibang Valley District, Arunachal Pradesh
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Wildlife Conservation Plan ETALIN HEP Wildlife Conservation Plan for the impact zone of Etalin HEP, Dibang Valley District, Arunachal Pradesh 2019 Wildlife Conservation Plan ETALIN HEP Project Team: Project Leader Dr. V.B. Mathur, Director, Wildlife Institute of India Project Coordinator Dr. G.S. Rawat, Dean - FWS, Wildlife Institute of India Project Co-coordinator Dr. Gopi.G.V (Terrestrial ecology, Conservation plan) Investigators Dr. Asha Rajvanshi (Impact Assessment component); Dr. V.P.Uniyal (Entomofauna component); Dr. B.S. Adhikari (Vegetation and habitat ecology component); Dr. K.Sivakumar (Aquatic ecology component); Dr. J.A. Johnson (Aquatic ecology component), Dr. Gautam Talukdar (GIS/RS component) and Mr. Salvador Lyngdoh (Socio-economics component) Subject Matter Specialists Dr. Sarnam Singh (Conservation and mitigation plan); Dr. Justus (Senior Level) Joshua (Terrestrial ecology, conservation and mitigation plan); Dr. Wesley Sundarraj (Terrestrial ecology, conservation and mitigation plan); Dr. Roshni Arora (Aquatic ecology, conservation and mitigation plan component) and Dr. Vidyadhar Atkore (Aquatic ecology, conservation and mitigation plan component) Subject Matter Specialists Er. A.D.Udhayaraj (GIS/RS component); Ms. Arundhati Mohanty (Junior Level) (Mammal component) and Ms. Irina Das Sarkar (Entomofauna component) Project Biologists Ms. Monideepa Mitra (Vegetation and habitat ecology component); Mr. Sumit Arya (Bird component); Ms. Divya Deshwal (Socio- economics component) and Ms. Pallabi Mitra (Aquatic ecology component) Project Interns Mr. Aisho Sharma Adhikarimayum and Mr. S.Deepan Chackaravarthy All the team members mentioned above equally contributed in field data collection, analysis and report writing Funding Agency: Etalin Hydro Electric Power Company Limited (EHEPCL), Arunachal Pradesh Budget: 170.36 Lakhs Only Citation: WII (2019). Wildlife Conservation Plan for the impact zone of Etalin HEP, Dibang Valley District, Arunachal Pradesh. Wildlife Institute of India, Dehradun. Technical Report TR No/2019/01. Pp - 298 (i) Wildlife Conservation Plan ETALIN HEP CONTENTs List of tables List of Maps List of Plates List of Boxes List of Annexures Acknowledgement Abbreviations Executive summary 1 Chapter 1- Introduction 21 1.1 Hydropower potential of Arunachal Pradesh 21 1.2 Biodiversity status of Arunachal Pradesh 22 1.3 Overview of hydropower impacts on the biodiversity of AP 24 a) General overview 24 b) Hydropower development and its impact on the biodiversity of Arunachal Pradesh 25 1.4 Rationale for harmonising hydropower development and conservation planning for sustainable outcomes 36 Chapter 2- Environmental and Technical Considerations 28 2.1 Project Background 28 2.2 Objectives of the study 28 2.3 Scope of work and implementation schedule 28 Chapter 3- The Study Area and Project Profiles 31 3.1 Ecological profile 31 3.1.1 Dri River 32 3.1.2 Tangon River 33 3.1.3 Dibang River 34 3.1.4 Sociology of Dibang valley 34 3.2 Project Profile 34 3.3 Delineation of Zone of Influence (ZoI) 35 Chapter 4- Approach and Methodology 36 4.1 Baseline data collection 36 4.1.1 Terrestrial biodiversity 36 4.1.1.1 Flora 36 4.1.1.2 Entomofauna (Arthropods – Butterflies, Moths, Odonates and Spiders) 40 4.1.1.3 Herpetofauna 43 4.1.1.4 Avifauna 45 4.1.1.5 Mammals 48 4.1.2 Aquatic biodiversity 50 4.1.3 Socio-cultural Status 57 4.4 Geospatial database 60 (ii) Wildlife Conservation Plan ETALIN HEP 4.4.1 Methodology 62 4.4.1.1 Demarcation of the Study area / Delineation of Zones of Impact (ZOI) 62 4.4.1.2 Satellite data used 63 4.4.1.3 Software used 63 4.4.1.4 Methodology adopted for the Vegetation Types and Land Use / Land Cover Mapping. 63 Chapter 5- Assessment of Biodiversity values in the study area 64 5.1 Habitat Status – Mapping Vegetation and Land Use / Land Cover and other features 64 5.1.1 Vegetation types and Land Use / Land Cover 64 5.1.1.1 Description of different Vegetation and Land Use/Land Cover types 66 5.1.2 Terrain and Topographic features 68 5.1.2.1 Slope 68 5.1.2.2 Aspect 70 5.2 Terrestrial Biodiversity 71 5.2.1 Status of Flora 71 5.2.1.1 Vegetation Community Composition 72 5.2.1.2 Species Richness and Diversity 75 5.2.1.3 Status of Species of Conservation Significance 76 5.2.1.4 Overall Status of Plant Species in and around Etalin HEP Study Area 78 5.2.2 Status of Entomofauna 79 5.2.2.1 Butterflies 79 5.2.2.2 Odonates 84 5.2.2.3 Spiders 87 5.2.2.4 Moths 89 5.2.3 Status of Herpetofauna 92 5.2.3.1 Amphibians 92 5.2.3.2 Reptiles 93 5.2.3.3 Species of Conservation Significance 93 5.2.4 Status of Birds 95 5.2.4.1 Bird Species Richness based on Inventory 105 5.2.4.2 Overall species Richness 105 5.2.4.3 Species of Conservation Significance 106 5.2.5 Status of Mammals 112 5.2.6 Terrestrial Biodiversity Values of Etalin HEP Study Area 119 5.3 Aquatic Biodiversity 120 5.3.1 Habitat Quality 120 5.3.2 Richness and Diversity of Fishes and Benthic Invertebrates 121 5.3.2.1 Benthic Invertebrate Richness 121 5.3.2.2 Fish Richness 127 5.3.2.3 Aquatic biodiversity values in EHEP 132 5.4 Socio-cultural Status and Biodiversity Conservation 134 (iii) Wildlife Conservation Plan ETALIN HEP 5.4.1 Household and demographic profile of the Project Affected Villages (PAV) 135 5.4.2 Nature based Livelihood 136 5.4.3 Socio-cultural Importance of Natural Resources 138 5.4.3.1 Importance of Plant Resources 138 5.4.3.2 Importance of Animal Resources 142 5.4.3.3 Religious importance of Natural Resources 144 5.4.3.4 People’s Perception on Etalin HEP Project 145 Chapter 6- Assessment of Impacts of hydropower on key biodiversity areas & values 147 6.1 Introduction 147 6.2 Identification of potential significance of terrestrial biodiversity – spatial scale 147 6.2.1 Impact Potential of the EHEP with respect to Terrestrial Biodiversity –Spatial Scale 147 6.2.2 Significance of the Impacts of EHEP on Terrestrial Biodiversity – Spatial Scale 148 6.3 Impacts of project activities on biodiversity – micro level evaluation 149 6.3.1 Predicted Impact Matrix 149 6.4 Land-acquisition Impact on Forest/Community Forest Land 153 6.4.1 Acquisition of Forest and Community Forest Lands – Impacts of Habitat Loss and Biodiversity Values 153 6.5 Project associated activities- Impacts on Biodiversity 160 6.5.1 Muck-Dump Generation and Handling – Impacts on Physical and Biological Resources 160 6.6 Dust and Oxides Emission- Impacts on Forest habitat and Fauna 161 6.6.1 Impacts of Construction Activities - Dust and Gaseous Emission on Vegetation and Faunal Diversity 161 6.6.2 Drilling and Blasting for Coarse and Aggregates Quarry – Impacts of Noise and Ground Vibration on selected Faunal groups 163 6.7 Roads, Heavy Vehicle and Equipment Movements – Impacts on Faunal Groups 164 6.7.1 Unregulated Vehicle Movement - Road Mortality on selected Faunal groups 164 6.8 Impacts on Aquatic Ecology 166 6.8.1 Impact Potential of the EHEP with respect to Aquatic Biodiversity 166 6.8.2 Significance of the Impacts of EHEP on the Aquatic Biodiversity 167 6.8.3 Impacts on Habitats - Water Quality and Physical Changes 168 6.8.4 Assessment of Impacts on Aquatic Biodiversity 169 6.8.4.1 Impacts of construction and widening of Roads 170 6.8.4.2 Impacts of Hazardous and Domestic Waste Disposal – River system 170 6.9 Impacts on Threatened Biodiversity 171 6.9.1 Overall of Project Associated Construction Activities - Impacts on Threatened Fauna 171 6.10 Biodiversity use Values of Local People 173 6.10.1 Loss of Forest Habitat and Impact on Natural Resource Dependency of Local People 173 6.10.2 Labour force related Biotic Pressure- Impact on Forest Resources and Faunal Species 174 6.11 Impacts on Ecologically Sensitive Area –ESA 176 6.11.1 Vicinity of Ecologically Sensitive Area to Project location - Impacts on Ecologically Sensitive Area 176 6.11.2 Project location on Wildlife Corridor – Impacts through Restriction of Movement of Key Species 176 (iv) Wildlife Conservation Plan ETALIN HEP Chapter 7: Mitigation – Biodiversity and Wildlife Conservation Plan 182 7.1 Introduction 182 7.1.1 General Priorities for Biodiversity and -Wildlife Conservation Plan 182 7.2 Priority Issues for Mitigation and Conservation Plan 183 7.2.1 Compensatory Afforestation: Loss of Habitat 183 7.2.2 Green Shelterbelt – Phyto-remediation: Impacts of Dust and Gaseous Emission 183 7.2.3 Muck-dump Management and Restoration – Terrestrial and Riverine Habitat 183 7.2.4 Technical and Managerial Interventions - Drilling and Blasting Effects on Selected Faunal Groups 184 7.2.5 Spatio-temporal Regulatory Mechanism - Roads and Vehicle Impacts on selected Faunal Groups 184 7.2.6 Species Group Conservation Plan – Habitat / Niche Enhancement or Development 184 7.2.7 Aquatic Ecosystem 184 7.2.8 Habitat Rehabilitation and Restoration – Impact on RET species 185 7.2.9 Natural Resource and Life Quality Enhancement – Loss of Forest based Natural Resource 185 7.2.10 Research and Monitoring – Ecologically Sensitive Area and Key Species Monitoring 186 7.3 Action Plan – Mitigation and Conservation Plan 187 7.4 Mitigation – Mandatory Action Plan 188 7.4.1 Compensatory Afforestation 188 7.4.2 Green Shelterbelt- Phyto-remediation 189 7.4.3 Muck-dump management and Restoration 191 7.4.4 Technical and Managerial Interventions – Noise and Vibration 192 7.4.5 Technical and Regulatory Mechanism- Mitigation for Faunal Mortality 193 7.5 Conservation Plan – Biodiversity 194 7.5.1 Species Group Conservation plan – Habitat / Niche Development / Enhancement 194 7.5.1.1 Development of Open Butterfly Parks 194 7.5.1.2 Reptile Park Habitat / Niche