Note4Students
From UPSC perspective, the following things are important :
Prelims level: Eurasian Otters
Mains level: NA
Researchers conducting a study in Odisha’s Chilika Lake have found the presence of a viable, breeding population of Eurasian Otters, a fishing cat in the brackish water lagoon.
Eurasian Otters
- IUCN Status: Near Threatened
- Species in India: Smooth-coated, Asian small-clawed and Eurasian Otters
- Habitat: Smooth-coated — all over India; Asian small-clawed — only in the Himalayan foothills, parts of the Eastern and southern Western Ghats; Eurasian — Western Ghats and Himalayas.
- Diet comprises several small animals, mainly crabs and small fishes.
- Lives in small packs, is mostly nocturnal, but can be diurnal in areas which are less disturbed.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Thanatotheristes
Mains level: Not Much
Scientists have found that a dinosaur fossil, found in Alberta in Canada in 2010, belongs to a new species of tyrannosaur. They have named it Thanatotheristes, which means “reaper of death”.
Thanatotheristes
- Tyrannosaurs were one of the largest meat-eating dinosaurs to have ever lived, with very large and high skulls, and the best known among them is the Tyrannosaurus rex, celebrated in the Jurassic Park series.
- The 79-million-year-old fossil that the researchers have found is the oldest tyrannosaur known from northern North America.
- Thanatotheristes preyed on large plant-eating dinosaurs such as the horned xenoceratops and the dome-headed colepiochephale.
- The research suggests that tyrannosaurs did not have one general body type; rather different tyrannosaur species evolved distinct body sizes, skull forms and other such physical features.
- The fossil specimen is important to understand the Late Cretaceous period, which is the period when tyrannosaurs roamed the Earth.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Flame-throated Bulbul
Mains level: NA
The flame-throated bulbul, also called the Rubigula, was chosen as the mascot of the 36th National Games to be held in Goa. It is the State bird of Goa.
Flame-throated Bulbul
IUCN status: Least Concern
- The Flame-throated Bulbul is endemic to southern peninsular India where it is locally distributed in southern Andhra Pradesh, eastern Karnataka, Goa, Orissa, eastern Kerala and northern Tamil Nadu.
- It prefer habitats like rocky, scrub-covered hills mostly in the Eastern Ghats and central peninsular India but also in some places in the Western Ghats.
- It is a Schedule – IV bird under the Wildlife (Protection) Act, 1972.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Natrialba Swarupiae, Sambhar Lake
Mains level: Not Much
- Scientists at the National Centre for Microbial Resource — National Centre for Cell Science (NCMR-NCCS) in Pune have reported a new archaeon (a kind of microorganism), which they discovered in Sambhar Salt Lake in Rajasthan.
- The new archaeon has been named Natrialba swarupiae, after Dr Renu Swarup, secretary, Department of Biotechnology, for her initiative in supporting microbial diversity studies in the country.
Archaea
- Archaea (singular archaeon) are a primitive group of microorganisms that thrive in extreme habitats such as hot springs, cold deserts and hypersaline lakes.
- These slow-growing organisms are also present in the human gut, and have a potential relationship with human health.
- They are known for producing antimicrobial molecules, and for anti-oxidant activity with applications in eco-friendly waste-water treatment.
- Archaea are extremely difficult to culture due to challenges in providing natural conditions in a laboratory setting.
- As archaea are relatively poorly studied, very little is known about how archaea behave in the human body.
- The organism has potential gene clusters that helps maintain the metabolism of the archaea to survive in extreme harsh conditions.
Search and discovery
- Sambhar Lake has been poorly studied for microbial ecology studies.
- With a salt production of 0.2 million tonnes per annum, it is also a hypersaline ecosystem which provides an opportunity for microbial ecologists to understand organisms that thrive in such concentrations.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Steppe Eagle
Mains level: Conservation of migratory birds in India
A lone endangered steppe eagle (Aquila nipalensis) has been sighted by a group of birdwatchers in a paddy field near Vijayawada.
Steppe Eagle
- The Steppe Eagle is a migratory raptor which has undergone extremely rapid population declines within all its range.
- It breeds in Russia, Kazakhstan, and Mongolia during the winter season.
- Steppe eagle is the second-largest migratory eagle species to India.
- IUCN Status: It has moved from ‘Least Concern’ to ‘Endangered’
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: In-vitro fertilization, White Rhinos
Mains level: Ethical issues surrounding IVF
Researchers had created another embryo — the third — of the nearly extinct northern white rhino. This is seen as a remarkable success in an ongoing global mission to keep the species from going extinct.
What is IVF?
- IVF is a type of assisted reproductive technology used for infertility treatment and gestational surrogacy.
- A fertilised egg may be implanted into a surrogate’s uterus, and the resulting child is genetically unrelated to the surrogate.
- Some countries have banned or otherwise regulate the availability of IVF treatment, giving rise to fertility tourism.
- Restrictions on the availability of IVF include costs and age, in order for a woman to carry a healthy pregnancy to term.
- IVF is generally not used until less invasive or expensive options have failed or been determined unlikely to work.
IVF process
- In vitro fertilisation (IVF) is a process of fertilization where an egg is combined with sperm outside the body, in vitro (“in glass”).
- The process involves monitoring and stimulating a female ovulatory process, removing an ovum or ova (egg or eggs) from the female ovaries and letting sperm fertilise them in a liquid in a laboratory.
- After the fertilised egg (zygote) undergoes embryo culture for 2–6 days, it is implanted in the same or another female uterus, with the intention of establishing a successful pregnancy.
Types of Rhinos
- The northern white is one of the two subspecies of the white (or square-lipped) rhinoceros, which once roamed several African countries south of the Sahara.
- The other subspecies, the southern white is, by contrast, the most numerous subspecies of rhino, and is found primarily in South Africa.
- There is also the black (or hook-lipped) rhinoceros in Africa, which too, is fighting for survival, and at least three of whose subspecies are already extinct.
- The Indian rhinoceros is different from its African cousins, most prominently in that it has only one horn.
- There is also a Javan rhino, which too, has one horn, and a Sumatran rhino which, like the African rhinos, has two horns.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: IUCN , Red List, Chinese paddlefish
Mains level: IUCN mechanism of listing
One of the largest freshwater species, Chinese paddlefish has been declared extinct.
Chinese paddlefish
- The Chinese paddlefish (Psephurus gladius) was an iconic species, measuring up to 7 m in length, dating back from 200 million years ago, and therefore swimming the rivers when dinosaurs ruled the Earth.
- Its ancestral home was the Yangtze River.
- It was once common in the Yangtze, before overfishing and habitat fragmentation — including dam building — caused its population to dwindle from the 1970s onwards.
- Between 1981 and 2003, there were just around 210 sightings of the fish. The researchers estimate that it became functionally extinct by 1993, and extinct sometime between 2005-2010.
How did the study determine that it has gone extinct?
- Chinese researchers made this conclusion based on the Red List criteria of the International Union for Conservation of Nature (IUCN).
- The Red List has several categories for extinction, or for how endangered a species is.
- For example, “extinct in the wild” means a species survives only in a captive environment while “locally extinct” means a species has ceased to exist in a particular area but may exist in other areas.
- Then there is “functionally extinct”, which means the species continues to exist but it has too few members to enable to reproduce meaningfully enough to ensure survival.
- To be “globally extinct”, it means a species has no surviving member anywhere. Such a conclusion is reached when there is no reasonable doubt left that its last member has died.
How does extinction status matters for conservation?
- Declaring a species extinct is an elaborate process.
- It involves a series of exhaustive surveys, which need to be taken at appropriate times, throughout the species’ historic range and over a time-frame that is appropriate to the species’ life cycle and form.
- When these surveys fail to record the existence of any individuals belonging to that species, a species may be presumed to be extinct.
- Once declared extinct, a species is not eligible for protective measures and conservation funding; therefore, the declaration has significant consequences.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Senna spectabilis
Mains level: Impacts of the invasive alien species
The Kerala Forest Department is planning to adopt steps to arrest the rampant growth of invasive plants, especially Senna spectabilis, in the forest areas of the Nilgiri Biosphere Reserve (NBR).
Senna spectabilis
- The Senna spectabilis species was planted as avenue trees in Wayanad. The vayal ecosystem (marshy land) of the forest area now has this plant in large numbers.
- The spread is posing a major threat to the forest areas of the reserve, owing to its quick growth and coppicing character.
- The tree species was found in nearly 10 sq km area of the 344.44 sq km sanctuary around five years ago.
- The plant has started to invade the adjacent Bandipur and Nagarhole tiger reserves in Karnataka and the Mudumalai tiger reserve in Tamil Nadu.
- Now, it had invaded to more than 50 sq km of the sanctuary Wayanad WLS.
- A recent study of the Ferns Nature Conservation Society recorded the presence of the plant in 78.91 sq km area of the sanctuary.
Impact
- An adult tree grows up to 15 to 20 metres in a short period of time and every year distributes thousands of seeds after gregarious flowering.
- The thick foliage arrests the growth of other indigenous tree and grass species and causes food shortage for the wildlife population, especially herbivores.
- Moreover, wildlife will not feed on the leaf of the treeas it is not palatable for them.
- The allelochemicals produced by this plant adversely affect the germination and growth of the native species.
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