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Subject: Biodiversity

1. Ecology & Ecosystems
2. Indian Biodiversity

  • Species in news: Swamp Wallaby

     

    Researchers reported that the swamp wallaby, a marsupial related to the kangaroo, is pregnant throughout its adult life. It typically conceives a new embryo days before delivering the newborn from its previous pregnancy.

    Swamp wallaby

    IUCN Status: Least Concerned

    • The swamp wallaby is a small macropod marsupial of eastern Australia. It is likely the only mammal pregnant and lactating all lifelong.
    • Female wallabies and kangaroos have two uteri and two separate ovaries.
    • At the end of a pregnancy in one uterus, a new embryo develops in the other uterus.
    • Kangaroos and wallabies regularly have an embryo in the uterus, a young joey in the pouch, and a third semi-dependent young at foot, still drinking its mother’s milk.

    How it is different from Kangaroo?

    • In kangaroos, the new embryo is conceived a day or two after the previous birth.
    • In the swamp wallaby (Wallabia bicolor), the new conception happens one or two days before the previous joey is delivered.

    What happens after?

    • As soon as the mature foetus is born and settles in the pouch, the swamp wallaby arrests the development of the new embryo.
    • This is called embryonic diapause, which happens in many animals to pause reproduction until the conditions are right — season, climate, food availability.
    • For wallabies, this is also to ensure that the new one is born only when the pouch is free again.
    • If this did not happen, the swamp wallaby would be birthing new young every 30 days — it has a short gestation period — and its pouch could not support that.

  • Migratory species in India

     

     

    With new additions to the wildlife list put out by the Convention on the Conservation of Migratory Species (CMS), scientists say that the total number of migratory fauna from India comes to 457 species.

    Migratory species in India

    • Globally, more than 650 species are listed under the CMS appendices and India, with over 450 species, plays a very important role in their conservation.
    • The Zoological Survey of India (ZSI) had for the first time compiled the list of migratory species of India under the CMS before the Conference of Parties (COP 13) held in Gujarat recently.
    • It had put the number at 451. They are the Asian elephant, great Indian bustard, Bengal florican, oceanic white-tip shark, urial and smooth hammerhead shark.
    • Birds comprise 83% (380 species) of this figure.

    Various species mentioned

    • India has three flyways (flight paths used by birds): the Central Asian flyway, East Asian flyway and East Asian–Australasian flyway.
    • In India, their migratory species number 41, followed by ducks (38) belonging to the family Anatidae.
    • The estimate of 44 migratory mammal species in India has risen to 46 after COP 13.
    • The largest group of mammals is definitely bats belonging to the family Vespertilionidae. Dolphins are the second highest group of mammals with nine migratory species of dolphins listed.
    • Fishes make up another important group of migratory species. Before COP 13, the ZSI had compiled 22 species, including 12 sharks and 10 ray fish.
    • Seven reptiles, which include five species of turtles and the Indian gharial and salt water crocodile, are among the CMS species found in India. There was no addition to the reptiles list.

  • Species in news: Eurasian Otters

     

     

    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.

  • Pakke Tiger Reserve

     

    The government in Arunachal Pradesh is planning to build a 692.7 km highway through the 862 sq km Pakke Tiger Reserve (PTR). Named the East-West Industrial Corridor, the highway aims to connect Bhairabhunda in West Kameng district and Manmao in Changlang district along Arunachal Pradesh’s border with Assam.

    About Pakke Tiger Reserve (PTR)

    • Pakke Tiger Reserve, also known as Pakhui Tiger Reserve, is a Project Tiger reserve in the East Kameng district of Arunachal Pradesh.
    • The 862 km2 reserve is protected by the Department of Environment and Forest of Arunachal Pradesh.
    • This Tiger Reserve has won India Biodiversity Award 2016 in the category of ‘Conservation of threatened species’ for its Hornbill Nest Adoption Programme.
    • It falls within the Eastern Himalaya Biodiversity Hotspot.

  • Species in news: Senna spectabilis


    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.

  • New Species of Plants and Animals Discovered