ENVIRONMENT

Oil from a wrecked tanker is creating a disaster in the waters of Bangladesh’s Sundarbans, the largest contiguous tidal mangrove forest in the world and a haven for a spectacular array of species, including rare dolphins and the endangered Bengal tiger. (Nat Geo News)

Use this activity to help students model an oil spill’s impact on mangrove trees.

Teachers, scroll down for a short list of key resources in our Teachers’ Toolkit.

Discussion Ideas

• An oil spill is threatening the economic and environmental security of the Sundarbans, a region of “extraordinary biodiversity,” according to the Nat Geo News article. How are mangrove trees uniquely adapted to the Sundarbans? (Read the Nat Geo News article or the last two paragraphs in our encyclopedic entry on the physical geography of Asia, which are all about the Sundarbans!)
  • Mangroves thrive in brackish water. According to our encyclopedic entry, “mangroves are hardy trees that are able to withstand the powerful, salty tides of the Bay of Bengal as well as the freshwater flows from the Ganges and Brahamaputra Rivers.”
  • Mangroves have adapted to both aquatic and terrestrial soil. This means the trees help provide habitats for terrestrial species (such as monkeys and tigers), aquatic species (such as fish and crabs), and species that live and migrate through both habitats (such as insects and amphibians).

• “In the short to medium term, plants with pneumatophores will struggle,” says Anurag Danda, head of the Sundarbans Program Office for WWF India. What are pneumatophores, and how will the oil spill impact them specifically? Read through our terrific, hands-on activity “Oil’s Impact on Black Mangrove Trees” for guidance.
  • A pneumatophore, also called an aerial root, is a snorkel-like plant root. Unlike most plant roots, pneumatophores grow above ground. In addition to mangroves, plants such as orchids, banyan, and even poison ivy have pneumatophores.
  • In our activity, students use everyday items such as straws, sand, and molasses to create their own “oil spill” in a hand-made mangrove environment. This is a great activity that allows students to create their own muddy mangrove swamp—and see how it responds to changes in weather or the ocean. Students will also understand how those factors (weather and ocean conditions) change the impact of an oil spill. Look in the “Preparation” tab for a complete list of materials.
    • FYI: The shadowy pneumatophores of mangrove species support rich tropical and subtropical biodiversity, and our activity applies to both the Gulf Coast of the United States and the Ganges Delta of Bangladesh. The black mangrove is indigenous only to the Americas and West Africa, however. Its sister species, the sundari mangrove, is the dominant tree in the Sundarbans, and the plant for which the region is named. A good way to tell the difference between these species is that the black mangrove lacks the twisting, overlapping prop roots common to the sundari.

• Read the Nat Geo News article and the final two paragraphs in our encyclopedic entry on the physical geography of Asia. Make a list of some of the animals likely to be affected by the oil spill.
  • These are just a few of the species mentioned in the article and encyclopedic entry. The Sundarbans is rich in biodiversity.

    

    

    

    

    

    

    

    

    

    

    

    

    

     

• How will the Sundarbans oil spill impact the Bangaldeshi and Indian residents of the Sundarbans?
  • According to the Nat Geo News article, “the mangrove’s sprawling root system is the land’s front-line defense against erosion.” Loss of mangroves could mean increased vulnerability to flooding—a very, very real threat in cyclone-prone region—and loss of cropland.
  • Mangroves provide wood and tannin, a chemical that can be sold for use in medicines.
  • Loss of wildlife would reduce the hunting and fishing income of many local residents.
  • Thousands of tourists visit the Sundarbans, a UNESCO World Heritage Site, every year. An oil spill would reduce the regional economy.

• Why is the Sundarbans region, which straddles India and Bangladesh, so vulnerable to an oil spill?
  • Lack of resources. “This catastrophe is unprecedented in the Sundarbans, and we don’t know how to tackle this,” Amir Hossain, chief forest official of the Sundarbans in Bangladesh, told reporters (including Nat Geo News). Another environmental scientist is quoted as saying “Possibly, there is no expertise to handle an oil spill in an estuary in this part of the world.”

TEACHERS’ TOOLKIT

Nat Geo: After Oil Spill in Bangladesh’s Unique Mangrove Forest, Fears About Rare Animals

Nat Geo: Oil’s Impact on Black Mangrove Trees

Nat Geo: Asia: Physical Geography

UNESCO World Heritage: Sundarbans National Park