Decline in Avian Species in Assam
Subject: Biodiversity
Topic: Bird Conservation

A recent study published in the Journal of Threatened Taxa highlights a significant decline in avian species at the Bordoibam-Bilmukh Bird Sanctuary (BBBS) in Assam, with numbers dropping by nearly 72% over the past 27 years. The research was conducted by a team of independent researchers from North Lakhimpur and Barpeta over 154 days between October 2022 and March 2024. Their findings indicate alarming trends in biodiversity loss in this important wetland area.

Key findings from the study:

  • The total number of bird species recorded in the BBBS has decreased from 167 species in 1997 to only 47 species during the recent study, a decline of about 71.85%.
  • The decline has been particularly sharp since 2018, suggesting a worsening trend in avian diversity.
  • The research team observed 47 species during their study, which belong to 16 orders and 29 families.
  • Previous surveys conducted in 2011 and 2017-2018 reported 133 species and 120 species of birds, respectively, indicating a steady decline over the years.
  • Among the bird species examined, several were migratory, such as the brown shrike, citrine wagtail, and summer migratory lesser kestrel, alongside various resident species.
  • The study identified several anthropogenic factors contributing to the decline in bird species, including:
    • Overfishing and excessive harvesting of aquatic plants
    • Poaching of wild birds and collection of bird eggs
  • Specific bird species mentioned in the poaching context include the lesser whistling duck, fulvous whistling duck, white-breasted waterhen, and others.
  • Environmental disturbances such as crop cultivation using high-decibel machines near the water body's edge and using the sanctuary for grazing are forcing birds to relocate their foraging and breeding grounds.
  • The researchers noted that the deterioration of wetland habitats could lead to broader ecological issues, such as a decline in the water table, disruption of food chains, and a slowdown in the nutrient cycle, ultimately affecting both wildlife and humans.

The study urges for immediate conservation efforts to protect the BBBS, which is situated in Assam—one of India's most biodiverse states, home to around 950 bird species, including 17 endemic ones. Moreover, the state holds 55 Important Bird and Biodiversity Areas that serve as critical habitats for avian life.

In summary, the findings of this study raise serious concerns about the future of avian species in the Bordoibam-Bilmukh Bird Sanctuary due to human activities and habitat degradation. There is a pressing need for conservation initiatives to restore avian diversity and preserve the ecological balance of this key biodiversity hotspot.

Important Points to Note:

  • 72% decline in avian species at BBBS over 27 years.
  • Study involved 154 days of observation from October 2022 to March 2024.
  • 167 species recorded in 1997 dropped to 47 species recently.
  • Significant decline noted since 2018.
  • Previous surveys (2011 and 2017-2018) reported higher numbers of species.
  • Anthropogenic activities identified as primary causes of decline.
  • Concern raised over habitat degradation and its broader ecological impact.
  • Urgent conservation efforts are recommended to mitigate decline.
  • Assam identified as a biodiversity-rich state with significant avian habitats.
Key Terms, Keywords and Fact Used in the Article:
  • Bordoibam-Bilmukh Bird Sanctuary - Location of avian study
  • Dhemaji and Lakhimpur districts - Regions of the sanctuary
  • Journal of Threatened Taxa - Publication of study results
  • Biodiversity-rich States - Characteristic of Assam
  • Important Bird and Biodiversity Areas - Conservation hotspots
  • Decline in Avian Species in Assam
    Decline in Avian Species in Assam
    Subject: Biodiversity
    Topic: Bird Conservation

    A recent study published in the Journal of Threatened Taxa highlights a significant decline in avian species at the Bordoibam-Bilmukh Bird Sanctuary (BBBS) in Assam, with numbers dropping by nearly 72% over the past 27 years. The research was conducted by a team of independent researchers from North Lakhimpur and Barpeta over 154 days between October 2022 and March 2024. Their findings indicate alarming trends in biodiversity loss in this important wetland area.

    Key findings from the study:

    • The total number of bird species recorded in the BBBS has decreased from 167 species in 1997 to only 47 species during the recent study, a decline of about 71.85%.
    • The decline has been particularly sharp since 2018, suggesting a worsening trend in avian diversity.
    • The research team observed 47 species during their study, which belong to 16 orders and 29 families.
    • Previous surveys conducted in 2011 and 2017-2018 reported 133 species and 120 species of birds, respectively, indicating a steady decline over the years.
    • Among the bird species examined, several were migratory, such as the brown shrike, citrine wagtail, and summer migratory lesser kestrel, alongside various resident species.
    • The study identified several anthropogenic factors contributing to the decline in bird species, including:
      • Overfishing and excessive harvesting of aquatic plants
      • Poaching of wild birds and collection of bird eggs
    • Specific bird species mentioned in the poaching context include the lesser whistling duck, fulvous whistling duck, white-breasted waterhen, and others.
    • Environmental disturbances such as crop cultivation using high-decibel machines near the water body's edge and using the sanctuary for grazing are forcing birds to relocate their foraging and breeding grounds.
    • The researchers noted that the deterioration of wetland habitats could lead to broader ecological issues, such as a decline in the water table, disruption of food chains, and a slowdown in the nutrient cycle, ultimately affecting both wildlife and humans.

    The study urges for immediate conservation efforts to protect the BBBS, which is situated in Assam—one of India's most biodiverse states, home to around 950 bird species, including 17 endemic ones. Moreover, the state holds 55 Important Bird and Biodiversity Areas that serve as critical habitats for avian life.

    In summary, the findings of this study raise serious concerns about the future of avian species in the Bordoibam-Bilmukh Bird Sanctuary due to human activities and habitat degradation. There is a pressing need for conservation initiatives to restore avian diversity and preserve the ecological balance of this key biodiversity hotspot.

    Important Points to Note:

    • 72% decline in avian species at BBBS over 27 years.
    • Study involved 154 days of observation from October 2022 to March 2024.
    • 167 species recorded in 1997 dropped to 47 species recently.
    • Significant decline noted since 2018.
    • Previous surveys (2011 and 2017-2018) reported higher numbers of species.
    • Anthropogenic activities identified as primary causes of decline.
    • Concern raised over habitat degradation and its broader ecological impact.
    • Urgent conservation efforts are recommended to mitigate decline.
    • Assam identified as a biodiversity-rich state with significant avian habitats.
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    Limitations of Geological Carbon Storage

    The recent study published in Nature challenges the prevailing assumptions regarding geological carbon storage, an important strategy in combating climate change. The research emphasizes the finite nature of CO2 storage capacities, which may significantly impact global climate policies and strategies.

    Key Highlights:

    • Geological Carbon Storage: This process captures CO2 emissions from sources like power plants and injects it into deep rock formations for long-term storage.

    • Capacity Limit: The study asserts that the Earth can safely hold only about 1,460 billion tonnes of CO2 underground, contrary to earlier estimates of 11,800 billion tonnes. This drastic reduction indicates that resources for carbon storage are limited and should not be regarded as infinite.

    • Research Methodology: Researchers from Europe, the UK, and the US developed a global map of sedimentary basins, identifying suitable locations for CO2 storage while excluding:

      • Areas near earthquake zones
      • Polar regions
      • Biodiversity hotspots
      • Locations with practical constraints such as inadequate storage depth or offshore drilling limitations
    • Impact on Climate Strategies: The research warns that overreliance on geological storage could undermine effective climate strategies, compelling countries to reduce emissions promptly and treat carbon storage as a limited resource.

    • Temperature Reversal Limit: The study indicates that the maximum potential temperature reversal through carbon storage would be about 0.7º C, underscoring that while carbon storage can aid in climate mitigation, it cannot singularly address global warming.

    • Global Disparity in Storage Capacities: The research highlights unequal distribution of CO2 storage capacities, with higher capacities found in Russia, the US, and Saudi Arabia, while countries like India and several European nations possess significantly less capacity.

    • Recommendations for Global Climate Policy:

      • Governments should plan with precise knowledge of CO2 storage limits.
      • The study encourages prioritizing emission cuts over reliance on carbon storage.
      • Emphasis on rapid transitions to renewable energy sources, industrial changes, and the conservation of natural carbon sinks remains crucial.
    • Acknowledgment of Limitations: The authors note the study's limitation in not considering challenges in scaling up carbon capture and storage technology or potential advancements in related technologies in the future.

    Conclusion:

    The study’s findings underscore the necessity for a paradigm shift in climate strategies, advocating for immediate emission reductions over dependence on geological carbon storage. It highlights the urgent need for coherent global policies that recognize both the potential and limitations of carbon capture and storage technologies.

    Important Sentences:

    • The Earth’s safe CO2 storage capacity is estimated at 1,460 billion tonnes.
    • Earlier estimates of capacity were around 11,800 billion tonnes.
    • The research emphasizes the finite nature of underground storage and its implications for climate strategy.
    • The study found that the maximum temperature reversal through storage is only about 0.7º C.
    • There is a significant disparity in CO2 storage capacities among countries.
    • Immediate emission cuts remain the most viable solution to combating climate change.

    Environment and Ecology

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    Bats and Conservation Awareness Event

    Summary of the Article on Pint of View Lecture Featuring Bats

    The article revolves around a lecture conducted by Rohit Chakravarty at the Pint of View event on August 24, 2025, in Bengaluru. The event is inspired by a similar series in the United States known as "Lectures on Tap," aiming to discuss scientific topics in an informal yet engaging setting.

    • Event Details:

      • Date: August 24, 2025
      • Context: Part of Pint of View, which encourages informal discussions on scientific subjects.
      • Organizer: Harsh Snehanshu and Shruti Sah, with Meghna Chaudhary involved technical background.
    • Speaker Introduction:

      • Rohit Chakravarty is a bat project manager with associations to Nature Conservation Foundation and Bat Conservation International.
      • He shared personal anecdotes, emphasizing the non-threatening nature of bats based on his childhood experience rescuing a fruit bat.
    • Content of the Lecture:

      • Chakravarty discussed the diversity of bat species, their diets, life expectancy, and their behaviors.
      • Highlighted the social behavior of vampire bats sharing food during scarcity, and how Rodrigues fruit bats exhibit midwifing behaviors.
    • Historical Insights:

      • Spoke about Lazaro Spallanzani's 1794 discovery of bats using echolocation, further validated by Donald Griffin’s work on ultrasonic sounds.
    • Personal Discoveries:

      • Rohit recounted his research expeditions in locations from the Andaman and Nicobar Islands to the Himalayas.
      • He announced the discovery of a new species, the Himalayan long-tailed myotis, in the Western Himalayas extending into Khyber Pakhtunkhwa, Pakistan.
    • Ecological Significance:

      • Stressing the ecological importance of bats, he noted their role in pollinating agave plants, vital for tequila production, and their contribution to the ecosystem, especially for mangrove preservation against natural disasters.
    • Conservation Concerns:

      • Addressed the threats to bat populations, citing the near extinction risk facing the Kolar leaf-nosed bat due to granite mining.
      • Provided safety advice for humans while coexisting with bats, recommending to:
        • Maintain distance and avoid handling bats.
        • Avoid consuming fallen fruits that might be contaminated by bats’ saliva.
        • Keep distance from bat droppings to mitigate health risks.
    • Conclusion and Future Events:

      • Chakravarty concluded by asserting the responsibility of scientists to raise awareness about neglected species.
      • The next Pint of View lecture is set for September 7, 2025, focusing on textiles, memories, and history with fashion researcher Niyati Hirani. Upcoming lecture details can be accessed through their social media channel (@pintofview.club).

    The article combines educational content about bats with a cultural initiative aimed at fostering community interest in science, combining an accessible format with rigorous scientific discussion.

    Key Points:

    • Rohit Chakravarty is a notable bat researcher.
    • Pint of View aims to make science discussions more accessible.
    • Echolocation discovered by Spallanzani in 1794 was confirmed by Griffin later.
    • Human-bat coexistence requires awareness and safety measures.
    • Upcoming events continue to promote community engagement in scientific topics.

    Environment and Ecology

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    Biodiversity Study in Nilgiri Mountains

    Summary

    The Nilgiri mountains, located in the Western Ghats of India, are recognized as a critical biodiversity hotspot characterized by a rich tapestry of endemic species such as the Nilgiri pipit and Nilgiri laughingthrush. In a recent study published in Global Change Biology, researchers led by Vijay Ramesh examined the impact of land-use changes over the past 170 years on the bird populations of this region. The study collated historical bird data collected by British ornithologists in the late 1800s alongside contemporary surveys.

    Key Findings:

    • The researchers utilized historical specimens preserved in natural history museums and conducted field surveys at 42 previously studied sites to assess the changes in bird diversity.
    • They discovered a staggering 90% reduction in the relative abundance of grassland birds, with species like the Nilgiri pipit and Malabar lark experiencing the most significant declines.
    • The extent of grasslands in the Nilgiris dropped dramatically by 80%, from 993 square kilometers in 1848 to just 201 square kilometers in 2018.
    • Conversely, 53% of forest bird populations remained stable over the last century. This stability resulted from the conversion of grassland habitats to woodlands and forests due to anthropogenic influences and climate change, thereby providing alternative habitats for forest-dwelling species.

    Ecological Implications:

    • This study highlights that grasslands are often overlooked in conservation efforts, with a predominant focus on forest conservation. Associate Professor V.V. Robin pointed out that the perception around grasslands must shift to recognize their ecological significance.
    • The methods employed in the study underscore the importance of combining historical data with modern ecological analysis to understand biodiversity shifts comprehensively.

    Role of Natural History Museums:

    • The research relied heavily on historical collections from natural history museums, which serve as vital repositories of biodiversity data.
    • Pritha Dey, a moth biologist, emphasized the role of these museums in preserving historical species records essential for taxonomic identification and conservation research.
    • The study utilized statistical models such as the Field Abundance—Museum Abundance (FAMA) method to estimate species population changes by comparing historical and modern specimens.

    Challenges in Biodiversity Research:

    • Issues surrounding museum access include outdated infrastructure, lack of funding, and bureaucratic obstacles.
    • Sushma Reddy noted ongoing debates about the ownership and responsibility of international museums regarding specimens collected from countries like India.
    • The reliance on archival resources is hindered by complications in accessing and digitizing these historical materials, particularly in maintaining equitable sharing of biodiversity resources.

    Important Points:

    • Location: Nilgiri mountains, Western Ghats, India.
    • Research Publication: Study published in Global Change Biology on September 3, 2025.
    • Study Focus: Impact of land-use changes on bird diversity over 170 years.
    • Historical Data: Utilized specimens from the Victorian era and conducted field surveys.
    • Grassland Decline: 80% reduction in grassland area; 90% decline in grassland bird abundance.
    • Forest Bird Stability: 53% of forest bird populations remained stable due to habitat conversion.
    • Conservation Awareness: Need for recognition of grasslands in conservation efforts.
    • Natural History Museums: Essential for biodiversity research, preserving historical species data.
    • Challenges: Access to archival materials is complicated by institutional obstacles and funding issues.

    Environment and Ecology

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    Tamil Nadu Raptor Research Foundation Established

    On September 2, 2025, the Tamil Nadu Forest Department conducted a one-day workshop alongside the inaugural meeting of the Tamil Nadu Raptor Research Foundation (TNRRF) at the Advanced Institute for Wildlife Conservation (AIWC) in Vandalur, Chennai. This initiative is aimed at enhancing raptor conservation efforts and supporting research endeavors within the state of Tamil Nadu.

    Key Highlights:

    • Significance of Raptors: Raptors, also known as birds of prey, play a crucial role as indicators of ecosystem health. The global situation for these species is concerning, with approximately 18% at risk of extinction and numerous populations declining due to various threats.

    • Threats Faced: In Tamil Nadu, raptors are increasingly subjected to habitat loss, poisoning, electrocution from power lines, and illegal trade. Important raptor habitats within the state include the Western Ghats, Eastern Ghats, and coastal wetlands.

    • Government Initiatives: On July 9, 2025, the Tamil Nadu government issued a Government Order (G.O.) that allocated ₹1 crore from the Endangered Species Conservation Corpus Fund for the establishment of TNRRF, reflecting the state's commitment to biodiversity and conservation.

    • Foundation Objectives: The TNRRF will focus on several key areas:

      • Conducting species surveys and tracking migratory patterns of raptors.
      • Implementing rehabilitation programs for endangered species, such as eagles, vultures, and hawks.
      • Developing conservation strategies and community outreach initiatives to raise awareness and educate local populations regarding raptor conservation.
    • Guidelines and Expert Contributions: During the workshop, the TNRRF logo was unveiled, and the Wild Animal Carcass Management Guidelines were released. Experts, including Ranjit Daniels from Care Earth Trust and Sanjeev Menon from the State of India’s Birds Partnership, provided valuable insights on raptor conservation issues and identified various threats to these avian species.

    Conclusion:

    The establishment of the Tamil Nadu Raptor Research Foundation and the associated workshop signify a multi-faceted approach towards raptor conservation in Tamil Nadu. With government backing through financial support and a strategic plan focusing on research, community involvement, and education, it aims to address the pressing threats faced by raptor populations and promote healthier ecosystems in the state.

    Important Bullet Points:

    • A one-day workshop and inaugural meeting of the Tamil Nadu Raptor Research Foundation (TNRRF) took place on September 2, 2025.
    • The workshop was held at the Advanced Institute for Wildlife Conservation in Vandalur, Chennai.
    • Raptors serve as key indicators of ecosystem health but are facing significant global threats.
    • In Tamil Nadu, 18% of raptor species are at risk of extinction due to habitat loss, poisoning, electrocution, and illegal trade.
    • The Tamil Nadu government allocated ₹1 crore for TNRRF from the Endangered Species Conservation Corpus Fund as per the G.O. on July 9, 2025.
    • TNRRF's objectives include species surveys, migration tracking, and setting up rehabilitation programs for endangered raptors.
    • Presentations from experts during the workshop addressed conservation challenges and strategies.
    • The event emphasized the importance of community outreach and education in raptor conservation efforts.

    Environment and Ecology

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    Bats: Unveiling Their Mysteries and Importance

    On August 24, 2025, Rohit Chakravarty delivered the inaugural lecture at "Pint of View," a research-based discussion event inspired by a similar U.S. concept, "Lectures on Tap." The informal gathering encourages researchers to present their work, aiming to engage the public on various scientific topics. Chakravarty's session focused on the fascinating world of bats, dispelling myths around them, and highlighting their ecological significance.

    Key Highlights:

    • Event Overview:

      • The event, "Pint of View," aims to foster curiosity and intellectual exchange in a casual atmosphere.
      • Rohit Chakravarty was the first speaker, sharing insights into bat species and conservation efforts.
    • Chakravarty’s Experience with Bats:

      • He started by sharing his personal experience rescuing a fruit bat as a child, emphasizing his positive relationship with bats contrary to widespread misconceptions about them.
    • Ecological Importance of Bats:

      • Bats play crucial roles in pollination, particularly for agave plants, which are necessary for tequila production, and for mangroves, which serve as natural shields against storms and tsunamis.
    • Bat Behavior:

      • Interesting behaviors of bats were discussed, including:
        • Vampire bats in Central and South America sharing food with starving peers.
        • Rodrigues fruit bats exhibiting caregiving behaviors during childbirth.
        • Historical insights on echolocation, established by Lazaro Spallanzani in 1794 and later confirmed in the 20th century by American zoologists.
    • Diverse Species and Conservation:

      • Chakravarty detailed his research efforts across various geographical areas, including the Andaman and Nicobar Islands and the Western Himalayas, where he discovered a new species, the Himalayan long-tailed myotis.
      • Various bat species were presented, including the endangered horseshoe bats and Salim Ali’s fruit bat, highlighting the need for increased awareness and conservation measures.
    • Conservation Challenges:

      • The lecture pointed out threats to bat populations, such as habitat destruction due to granite mining, with specific reference to the endangered Kolar leaf-nosed bat.
      • Recommendations for coexisting with bats were made, including:
        • Maintaining distance from bats and their habitats.
        • Avoiding fallen fruits that may be contaminated.
        • Keeping away from bat droppings to prevent disease transmission.
    • Educational Outreach:

      • The concept of "Pint of View" represents an initiative by Harsh Snehanshu, Shruti Sah, and Meghna Chaudhary to promote learning and curiosity among the public, especially in a setting dominated by technology and corporate culture.
      • The event's format encourages informal learning and community engagement, breaking traditional barriers present in formal educational setups.
    • Upcoming Events:

      • The next session is scheduled for September 7, 2025, featuring a talk on textiles, memories, and history delivered by fashion researcher Niyati Hirani.

    Overall, the event illustrated the significance of research in public awareness and the ongoing need for conservation of often-overlooked species like bats, underlining their invaluable contributions to ecosystems.

    Biodiversity

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    Kishtwar Faces Threat from GLOF Risks

    Summary of the News Article on GLOF Risks in Kishtwar, Jammu and Kashmir

    On September 2, 2025, a report from the Disaster Management Plan for Kishtwar (2024-25) highlighted the vulnerability of Kishtwar district in Jammu and Kashmir to Glacial Retreat and Lake Outburst Floods (GLOFs). This concern follows the tragic event on August 14, when at least 65 civilians died due to a GLOF in Chisoti village, which marked the district’s first major incident of this nature.

    Key Findings of the Report:

    • Causal Factors: The report attributes the increase in GLOFs to the retreat of glaciers, a consequence of global warming, leading to the formation of new and expanding glacial lakes, which are held behind unstable moraine dams.
    • High-Risk Areas: The report specifically identifies the tehsils of Padder, Machail, Dachhan, Marwah, and Warwan as the most affected due to their proximity to glacial lakes.
    • Infrastructure Threats: Key infrastructure including roads, schools, hospitals, and government buildings in the aforementioned areas are at significant risk from potential flooding.
    • Impact on Hydroelectric Projects: The ongoing hydroelectric projects, such as those under Chenab Valley Power Projects (CVPPL Limited), are highlighted as being particularly vulnerable to GLOFs, which could disrupt operations and exacerbate flood risks downstream.
    • Environmental Concerns: The Kishtwar High Altitude National Park faces potential ecological disruptions, habitat loss, and threats to biodiversity due to GLOF events and contamination of water sources, which could negatively impact public health.

    Statistical Insights:

    • The region features a total of 197 glacial lakes, which constitute 36.08% of all such lakes in Jammu and Kashmir, covering approximately 392.64 hectares.
    • Notably, around 90.86% of these lakes are smaller than 5 hectares, while larger lakes (over 5 hectares) are relatively rare.

    Preparedness and Recommendations:

    • The report underscores the urgent need for proactive measures, which include:
      • The establishment of early warning systems (EWS) to anticipate climatic conditions that may trigger GLOFs.
      • Regular monitoring and assessment of glacier behavior using satellite-based technologies.
      • Enhancing community education on GLOF risks and providing training for emergency responses, including simulation drills to ensure preparedness.

    Seismic Risks:

    • The Kishtwar district lies in a seismically active region (Zone IV), which increases the vulnerability of moraine dams to collapse during seismic events, compounding the GLOF risk.

    In conclusion, the report outlines the critical situation regarding climate-induced GLOF threats in Kishtwar, necessitating immediate attention and action to safeguard both the local population and vital infrastructure.

    Important Points:

    • Date of Incident: August 14, 2025.
    • Victims: 65 deaths, over 100 injuries, and 33 missing.
    • Key Areas Impacted: Padder, Machail, Dachhan, Marwah, Warwan.
    • Infrastructure at Risk: Hospitals, schools, roads.
    • Hydroelectric Project Threats: Operations could be disrupted by GLOFs.
    • Glacial Lakes Count: 197 lakes, with 90.86% smaller than 5 hectares.
    • Urgent Actions: Establish early warning systems, community training, satellite monitoring.
    • Seismic Risk: Kishtwar located in Zone IV adds to vulnerabilities.

    The findings convey the urgent need for measures to mitigate these risks, protect natural resources, and prepare local communities effectively against this climate change-induced threat.

    Environment and Ecology

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