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Subject: Biodiversity

1. Ecology & Ecosystems
2. Indian Biodiversity

  • Chinese dam projects on Brahmaputra and impact on downstream countries

    Scarcity of water in India and China

    • As India and China continue to grow demographically as well as economically amid increased consumption among its citizenry, both nations face water constraints.
    • China, which is home to close to 20 per cent of the world’s population, has only 7 per cent of its water resources.
    • Severe pollution of its surface and groundwater caused by rapid industrialisation is a source of concern for Chinese planners.
    • China’s southern regions are water-rich in comparison to the water-stressed northern part.
    • The southern region is a major food producer and has significant industrial capacity as a consequence of more people living there.
    • India is severely water-stressed as well.
    • Similar to China, India has 17 per cent of the world’s population and 4 per cent of water.
    • As in China, an equally ambitious north-south river-linking project has been proposed in India.

    Impact on downstream states

    • The construction of several dams along the Yarlung (Brahmaputra) river on the Chinese side has been a repeated cause for concern for Indian officials and the local people.
    • China has an ambitious plan to link its south and north through canals, aqueducts and linking of major rivers to ensure water security.
    • In pursuit of these goals, China, being an upper riparian state in Asia, has been blocking rivers like the Mekong and its tributaries, affecting Southeast Asian countries like Thailand, Vietnam, Laos and Cambodia.
    • It has caused immense damage to the environment and altered river flows in the region.
    • China sees these projects as a continuation of their historic tributary system as the smaller states have no means of effectively resisting or even significant leverage in negotiations.

    Challenges for India

    • There are now multiple operational dams in the Yarlung Tsangpo basin with more dams commissioned and under construction. These constructions present a unique challenge for Indian planners.
    • 1) Dams will eventually lead to degradation of the entire basin:
    • Silt carried by the river would get blocked by dams leading to a fall in the quality of soil and eventual reduction in agricultural productivity.
    • 2) The Brahmaputra basin is one of the world’s most ecologically sensitive zones.
    • It is identified as one of the world’s 34 biological hotspots.
    • This region sees several species of flora and fauna that are endemic to only this part of the world.
    • The river itself is home to the Gangetic river dolphin, which is listed as critically endangered.
    • 3) The location of the dams in the Himalayas pose a risk.
    • Seismologists consider the Himalayas as most vulnerable to earthquakes and seismic activity.
    • The sheer size of the infrastructure projects undertaken by China, and increasingly by India, poses a significant threat to the populations living downstream.
    • Close to a million people live in the Brahmaputra basin in India and tens of millions further downstream in Bangladesh.
    • 4) Damming Brahmaputra would result in water security in an era of unprecedented shifting climate patterns.
    • This security extends beyond water, as there is the potential to significantly change the flow rate during times of standoffs and high tensions.

    Way forward

    • Both sides must cease new constructions on the river and commit to potentially less destructive solutions.
    • Building a decentralised network of check dams, rain-capturing lakes and using traditional means of water capture have shown effective results in restoring the ecological balance while supporting the populations of the regions in a sustainable manner.

    Conclusion

    There are alternate solutions to solving the water crisis.  It is in the interest of all stakeholders to neutralise this ticking water bomb.

  • Species in news: Meghalaya’s Glowing Mushrooms

    A mushroom documentation project in the forests of Northeast India has discovered a bioluminescent — or light-emitting — variety of mushroom.

    Try this PYQ:

    Q.Lichens, which are capable of initiating ecological succession even on a bare rock, are actually a symbiotic association of:

    (a) Algae and bacteria

    (b) Algae and fungi

    (c) Bacteria and fungi

    (d) Fungi and mosses

    Roridomyces phyllostachydis

    • The new species was first sighted near a stream in Meghalaya’s Mawlynnong in East Khasi Hills district and later at Krang Shuri in West Jaintia Hills district.
    • It is now one among the 97 known species of bioluminescent fungi in the world.

    Bioluminescence in fungi

    • Bioluminescence is the property of a living organism to produce and emit light.
    • Bioluminescent organisms are usually found in ocean environments, but they are also found in terrestrial environments.
    • The colour of the light emitted by the organism depends on its chemical properties.
    • In the case of fungi, the luminescence comes from the enzyme, luciferase.
    • The green light emits when luciferans is catalysed by the enzyme luciferase, in the presence of oxygen.

  • Vulture Action Plan for 2020-25

    Union Minister for Environment, Forests and Climate Change has launched a Vulture Action Plan 2020-25 for the conservation of vultures in the country.

    Vulture Action Plan

    • While the ministry has been carrying out a conservation project for vultures since 2006, the plan is to now extend the project to 2025 to not just halt the decline but to actively increase the vulture numbers in India.
    • There are nine recorded species of vultures in India — the Oriental white-backed, long-billed, slender-billed, Himalayan, red-headed, Egyptian, bearded, cinereous and the Eurasian Griffon.
    • Vulture numbers saw a steep slide — as much as 90 per cent in some species — in India since the 1990s in one of the most drastic declines in bird populations in the world.

    Decline in Populations

    • Between the 1990s and 2007, numbers of three presently critically-endangered species – the Oriental white-backed, long-billed and slender-billed vultures — crashed massively with 99 per cent of the species having been wiped out.
    • The number of red-headed vultures, also critically-endangered now, declined by 91% while the Egyptian vultures by 80%.
    • The Egyptian vulture is listed as ‘endangered’ while the Himalayan, bearded and cinereous vultures are ‘near threatened’.

    Why protect vultures?

    • Vultures are often overlooked and perceived as lowly scavengers, but they play a crucial role in the environments in which they live.
    • The scavenging lifestyle that gives them a bad reputation is, in fact, that makes them so important for the environment, nature and society.
    • Vultures, also known as nature’s cleanup crew, do the dirty work of cleaning up after death, helping to keep ecosystems healthy as they act as natural carcass recyclers.

    Various threats

    • The crash in vulture populations came into limelight in the mid-90s, and in 2004.
    • The cause of the crash was established as diclofenac — a veterinary nonsteroidal anti-inflammatory drug (NSAID) used to treat pain and inflammatory diseases such as gout — in carcasses that vultures would feed off.
    • Just 0.4-0.7 per cent of animal carcasses contaminated with diclofenac was sufficient to decimate 99 per cent of vulture populations.

    Various initiatives

    • The MoEFCC released the Action Plan for Vulture Conservation 2006 with the drugs controller banning the veterinary use of diclofenac in the same year and the decline of the vulture population being arrested by 2011.
    • The Central Zoo Authority (CZA) and Bombay Natural History Society (BNHS) also established the Vulture Conservation Breeding Programme.
    • It has been successful and had three critically-endangered species bred in captivity for the first time.
    • The ministry has now also launched conservation plans for the red-headed and Egyptian vultures, with breeding programmes for both.
    • The Vulture Safe Zone programme is being implemented at eight different places in the country where there were extant populations of vultures, including two in Uttar Pradesh.

  • Species in news: Rohanixalus -the frogs of the new genus

    Indian researchers have discovered a genus of tree frog found in the Andaman Islands and the northeast.

    A stand-alone species being mentioned in the news for the first time find their way into the prelims. Make special note here. Usually, note the species and its habitat location (IUCN status if available), in the purview of a generic prelims question.

    Genus Rohanixalus

    • Named after Sri Lankan taxonomist Rohan Pethiyagoda, the frogs of the new genus Rohanixalus are characterised by a rather small and slender body (size about 2 to 3 cm long).
    • It has a pair of contrastingly coloured lateral lines on either side of the body, minute brown speckles scattered throughout the upper body surfaces, and light green coloured eggs laid in arboreal bubble-nests.
    • Based on DNA studies, the new genus is also revealed to be a distinct evolutionary lineage from all previously known tree frog genera.
    • It is the 20th recognised genus of the family Rhacophoridae that comprises 422 known Old World tree frog species found in Asia and Africa.

    Sub-species of this frog

    • There are eight frog species in this genus Rohanixalus.
    • They are known to inhabit forested as well as human-dominated landscapes right from the northeast to Myanmar, Thailand, Malaysia, Indonesia, Vietnam, Laos, and Cambodia, up to southern China.

    Unique features of this genus

    • The genus has several unique behavioural traits including maternal egg attendance where the female (mother) attends the egg clutches until hatching and assists in the release of the tadpoles into the water.
    • During the first three days after egg-laying, the female sits over the eggs and produces a gelatinous secretion with which she glazes the egg mass through the clock-wise movement of her legs.
    • This behaviour provides necessary moisture to the eggs laid on exposed leaf surfaces and protects them from insect predation.

  • Species in news: Echinops Sahyadricus

    Researchers have discovered a new species of Echinops Sahyadricus (Sahyadri Globe Thistle) from the Rajgad Fort in the Sahyadri Mountains.

    Echinops Sahyadricus

    • Echinops is a genus of about 130 species of flowering plants found in tropical and North Africa, the Mediterranean basin and West Asia, extending eastwards to China and Japan.
    • The highest number of taxa (76) is concentrated in the Iranian plateau. Five species are found in India including two in Maharashtra.
    • The new species is unique because of the size of its composite inflorescence which measures up to 9 cm in diameter that is relatively large compared to other Echinops species found around the world.
    • It grows vegetative on open grassy slopes of mountains in four months of monsoon and blooms in November. Fruiting can be seen in December.

  • Kaleshwaram Lift Irrigation System (KLIS)

    The National Green Tribunal (NGT) wants a relook at Kaleshwaram Project since the Telangana government subsequently changed the design of the project.

    Try this question from our AWE initiative:

    The Kaleshwaram Project

    • The Kaleshwaram Lift Irrigation System is considered to be one of the world’s largest multi-purpose projects.
    • It is designed to provide water for irrigation and drinking purposes to about 45 lakh acres in 20 of the 31 districts in Telangana, apart from Hyderabad and Secunderabad.
    • This project is unique because Telangana will harness water at the confluence of two rivers with the Godavari by constructing a barrage at Medigadda in Jayashankar Bhupalpally district.
    • It would reverse pump the water into the main Godavari River and divert it through lifts and pumps into a huge and complex system of reservoirs, water tunnels, pipelines and canals.

    Records to its glory

    • The project has set many records with the world’s longest water tunnels, aqueducts, underground surge pools, and biggest pumps.
    • By the time the water reaches Kondapochamma Sagar, the last reservoir in the system, the water would have been lifted to a height of 618 metres from its source at Medigadda.
    • The total length of the entire Kaleshwaram project is approximately 1,832 km of which 1,531 km is gravity canals and 203 km comprises water tunnels.

    How important is KLIS to Telangana?

    • The project will enable farmers in Telangana to reap multiple crops with a year-round supply of water wherein earlier they were dependent on rains resulting in frequent crop failures.
    • This year, Telangana farmers have already delivered bumper rabi crops of paddy and maize due to better irrigation facilities and an extended monsoon.
    • KLIS covers several districts which used to face rainfall deficit and the groundwater is fluoride-contaminated.
    • Apart from irrigation, a main component of the project is the supply of drinking water to several towns and villages and also to twin cities of Hyderabad and Secunderabad.
    • Mission Bhagiratha, the Rs 43,000-crore project to supply drinking water to every household in villages, draws a large quantity of water from the KLIS and some quantity from projects on River Krishna.
    • There is a burgeoning freshwater fishing industry in the state.

    Issues raised by NGT

    • The NGT has observed that the Telangana government subsequently changed the design of the project to increase its capacity.
    • By increasing its capacity to pump 3 TMC water from 2 TMC, large tracts of forest land and other land was taken over and massive infrastructure was built causing adverse impact on the environment.
    • Extraction of more water certainly requires more storage capacity and also affects hydrology and riverine ecology of Godavari River.
    • Such issues have to be examined by the statutory authorities concerned.

    B2Basics

    National Green tribunal

    • It is a specialised body set up under the National Green Tribunal Act (2010) for effective and expeditious disposal of cases relating to environmental protection and conservation of forests and other natural resources.
    • With the establishment of the NGT, India became the third country in the world to set up a specialised environmental tribunal, only after Australia and New Zealand, and the first developing country to do so.
    • NGT is mandated to make disposal of applications or appeals finally within 6 months of filing of the same.
    • The NGT has five places of sittings, New Delhi is the Principal place of sitting and Bhopal, Pune, Kolkata and Chennai are the other four.

    Structure of NGT

    • The Tribunal comprises of the Chairperson, the Judicial Members and Expert Members. They shall hold office for term of five years and are not eligible for reappointment.
    • The Chairperson is appointed by the Central Government in consultation with Chief Justice of India (CJI).
    • A Selection Committee shall be formed by central government to appoint the Judicial Members and Expert Members.
    • There are to be least 10 and maximum 20 full time Judicial members and Expert Members in the tribunal.

  • Medicinal plants in news

    This newscard is an excerpt from the original article published in DownToEarth.

    Explained below are the medicinal properties of 10 valuable plants known to boost natural immunity:

    (1) Abrusprecatorius (Indian liquorice, Ratti)

    • The bright red ovoid seeds with a black spot weigh 1/10th of a gram, and were hence used as weighing unit called ‘Ratti’ in ancient India by goldsmiths.
    • Its seeds are said to have immune-modulating properties.

    (2) Artemisia scoparia (Redstem Wormwood)

    • These plants have excellent clinical anti-malarial properties due to the presence of artemisinin.
    • They possess potent anti-inflammatory properties and help regulate both innate and adaptive immunity.

    (3) Azadirachtaindica (Neem)

    • It is a well-known tree used in various systems of traditional medicine since time immemorial. In Sanskrit, it is known as Arishtha, which means ‘reliever of sicknesses’.
    • Neem bark is known to have strong immunostimulant Neem oil has been shown to possess activity by selectively activating cell-mediated immune mechanisms.

    (4) Boerhaviadiffusa (Punarnava)

    • In Ayurveda, Punarnava is included in the category of rasayana herbs that possess anti-ageing properties. It helps prevent diseases.
    • This means they increase resistance by providing hepatoprotection (the ability of a substance to prevent damage to the liver) and immune-modulation.

    (5) Cardaminehirsuta (Hairy Bitter Cress)

    • The plants contain vitamin C, calcium, magnesium, beta carotene, antioxidants and sulfur-containing compounds that boost immunity.

    (6) Clerodendrumphlomidis (Sage Glory Bower, Arni, Agnimantha)

    • It is an essential medicinal plant that is also mentioned in texts since the Vedic period. It is known to boost the immune system, purify the blood and cure urinary tract infection.
    • The decoction made from the whole plant is useful in improving strength and immunity following a bout of fever or other ailments.

    (7) Phyllanthus tenellus (Mascarene Island leaf-flower)

    • It is an annual herb commonly found near wetlands, ditches, wet places, edges of drains and disturbed places. It is known for immune-modulatory properties.
    • Physalis peruviana (Cape Gooseberry, Rasbhari) (Family: Solanaceae): It is used in traditional folk medicines as an immunomodulatory drug. It is rich in vitamin C and helps enhance body immunity.

    (8) Portulaca oleracea (Purslane)

    • Purslane has been used in folk medicine since ancient times and is included in the World Health Organization’s list of most widely used medicinal plants.
    • The leaves of the plant are a rich source of omega-3 fatty acids, which is important in preventing heart attacks and strengthening the immune system.

    (9) Withaniasomnifera (Indian Winter Cherry, Indian Ginseng, Aswagandha)

    • Ashwagandha is an important ancient herb and has been used in the indigenous medical system for over 3,000 years.
    • It is considered to be one of the best rejuvenating agents in Ayurveda that helps to maintain proper nourishment of the tissues. It possesses antioxidant, mind-boosting and immune-enhancing properties.

    Now try this PYQ:

    Q.Consider the following statements:

    1. The Taxus tree is naturally found in the Himalayas
    2. The Taxus tree is listed in the Red Data Book.
    3. A drug called “taxol” is obtained from Taxus tree is effective against Parkinson’s disease

    Which of the above statements is/are correct?

    (a) 1 only

    (b) 1 and 2 only

    (c) 2 and 3 only

    (d) 3 only

  • Species in news: Aenigmachanna Gollum

    Scientists have discovered a new family of bony fish from the Western Ghats and named it Aenigmachannidae.

    A stand-alone species being mentioned in the news for the first time (and that too from Southern India) find their way into the prelims. Make special note here. Usually, note the species and its habitat location (IUCN status if available), in the purview of a generic prelims question.

    Aenigmachannidae

    • Aenigmachanna Gollum has a surprisingly large number of primitive characters, and detailed molecular phylogenetic analyses including of its Mitochondrial DNA suggested an ancient separation from Channidae.
    • Many such species were earlier found in the aquifers of Kerala.
    • Many of these species are blind, pigment-less, and have peculiar morphological characters that are otherwise not seen in species occurring in surface waters.

    Significance of the discovery

    • The presence of two unique endemic families of freshwater fish in a small region like Kerala is unparalleled and indicates the exceptional diversity and endemicity of fishes in this part of the world.
    • The members of Aenigmachannidae are “living fossils” and comprise an ancient Gondwanan lineage that survived the break-up of the supercontinent and the northward drift of the Indian subcontinent.

  • [pib] Calcium Nitrate and Boronated Calcium Nitrate

    Union Ministry of Chemicals & Fertilizers has launched an indigenous variety of fertilizers- ‘Calcium Nitrate’ & ‘Boronated Calcium Nitrate’.

    Try this PYQ:

    Why does the Government of India promote the use of ‘Neem-coated Urea’ in agriculture?

    (a) Release of Neem oil in the soil increases nitrogen fixation by the soil microorganisms

    (b) Neem coating slows down the rate of dissolution of urea in the soil

    (c) Nitrous oxide, which is a greenhouse gas, is not at all released into atmosphere by crop fields

    (d) It is a combination of a weedicide and a fertilizer for particular crops

    What is Calcium Nitrate?

    • Calcium nitrate is used as a water-soluble fertilizer in agriculture. In addition, this product is also used in wastewater treatment and to increase the strength of cement concrete.
    • Last year, around 1.25 lakh metric tons (1,23,000 tons) of Calcium Nitrate was imported in the country.
    • Of this, 76% was imported from China and the rest from other countries like Norway and Israel.
    • These indigenous varieties will provide a quality product at a cheaper rate to the farmer community in the country than imported ones.

    Uses of Calcium nitrate

    • The fertilizer grade calcium nitrate is popular in the greenhouse and hydroponics. It is also used to control certain plant diseases.
    • Calcium nitrate is also used in wastewater pre-conditioning for odour emission prevention.

  • 3 contenders for National Butterfly Status

    A citizen poll to identify the national butterfly concluded with three species garnering the highest number of votes.

    Try this PYQ:

    Q.With reference to India’s Biodiversity, Ceylon frogmouth, Coppersmith barbet, Gray-chinned minivet and White-throated redstart are-
    (a) Birds
    (b) Primates
    (c) Reptiles
    (d) Amphibians

    Which are the three species?

    (1) Indian Jezebel

    • Blessed with a vibrant colour pattern, including vermilion (Haldi – kumkum), the Indian Jezebel (or Common Jezebel) is known to deter its predators with its flashy wing colours.
    • Regarded as soldiers of farmers, they also prey on parasites that infest fruit-bearing plants.
    • Widely distributed, the species can be spotted in gardens and other lightly wooded areas.

    (2) Krishna Peacock

    • It is a flagship species for biodiversity and conservation, generally found in large numbers in the Himalayas.
    • Possessing a peculiarly large swallowtail, its iridescent green scales diffract light to coat itself in radiance.

    (3) Orange Oakleaf

    • It is commonly known as ‘dead leaf’ for its ability to camouflage as a dry autumn leaf while striking a stationary pose with its wings closed.
    • The masquerade enables the species to prevent it from being devoured by birds in the moist forests of the northern Western Ghats, central, northern and northeastern parts of India where they are generally found.
    • Besides, the Oakleaf is also known to exhibit polyphenism as it assumes specific colour and size during dry and wet seasons.