GS Paper III Mains 2019 Question Analysis

  • Discuss the causes of depletion of Mangroves and explain their importance in maintaining coastal ecology.

Mains Assignment Question

Discuss the causes of depletion of Mangroves and explain their importance in maintaining coastal ecology. (150 Words)

Subjects : Environment, Biodiversity & Climate Change

Answer Approach :
  • Introduction: Define mangroves   
  • Body:  Causes of depletion of Mangroves, Importance in maintaining coastal ecology 
  • Conclusion: Importance of conserving Mangroves

Nikhil J

Mangroves are important ecological zones found at the interface between terrestrial and marine ecosystems. In India Mangroves are found mainly in the Ganga-Brahmaputra delta region, Andaman and Nicobar etc.

 

Causes for Depletion of Mangroves.

1. Unchecked clearing of mangroves for agricultural purposes.

2. Reduction in amount of deltaic deposits due to disruption in flow of rivers. Ex - Farraka Barrage.

3. Discharge of toxic effluents from Industries and Oil refineries.

4. Persistent damage caused due to undulated sea levels and tidal movements.

5. Unchecked Tourist activities and associated pollution - Ex - Plastic Pollution

Importance of Mangroves.

1. Rich Biodiversity - owing to it being an ecotone between terrestrial and marine ecosystem

2. Protection of Coastal Plains from salt water intrusion and destructive tsunamis.

3. Sediments in mangrove region contain traces of important minerals and nutrients carried by rivers.

4. Tourism - Large number of migratory birds.

5. High fertility of the region due to peat soil formed due to high organic content.

6. They act as Carbon sinks and reduce the impact of green house emissions in the region.

Steps to mitigate the depletion and conserve the biodiversity of the mangrove region is therefore critical to the sustenance of coastal ecoystem.

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Mangroves are important ecological zones found at the interface between terrestrial and marine ecosystems. In India Mangroves are found mainly in the Ganga-Brahmaputra delta region, Andaman and Nicobar etc. (This piece of information can be removed as it is not directly related to the demand of the question) (Your introduction covers only Indian perspective. Please add brief mention of world-wide condition of Mangroves depletion.)

 

Causes for Depletion of Mangroves.

  1. (Overharvesting)-Unchecked clearing of mangroves for agricultural purposes.
  2. Reduction in amount of deltaic deposits due to disruption in flow of rivers. Ex - Farraka Barrage. (Good)
  3. (Pollution)- Discharge of toxic effluents from Industries and Oil refineries.
  4. Persistent damage caused due to undulated sea levels and tidal movements.
  5. Unchecked Tourist activities and associated pollution - Ex - Plastic Pollution (Good)

(You could have organised this content in better way. You could give a heading to each point and under that mention more than one point/aspect and example has been given in you points. You can see the example in Model answer also.)

Importance of Mangroves.

  1. Rich Biodiversity - owing to it being an ecotone between terrestrial and marine ecosystem
  2. Protection of Coastal Plains from salt water intrusion and destructive tsunamis.
  3. Sediments in mangrove region contain traces of important minerals and nutrients carried by rivers.
  4. Tourism - Large number of migratory birds.
  5. High fertility of the region due to peat soil formed due to high organic content.
  6. They act as Carbon sinks and reduce the impact of green house emissions in the region.

(This portion of your answer is well presented and well written.)

Steps to mitigate the depletion and conserve the biodiversity of the mangrove region is therefore critical to the sustenance of coastal ecosystem. (Conclusion is very generic and does not contain any thing in concrete, you could mention any step taken recently/any institution/ organisation/ country/ government etc.)

Overall Feedback:

  • Answer is good in direction but lacks world-wide approach while the question wide and open. Do not limit it to India only.
  • There is a lack of examples. You can quote examples from India and other countries also.
  • Presentation needs to be improved little bit. You need to change the simple way of enlisting the causes as this method is consuming more words and also few important aspects and examples are missing.
  • The demand of the answer is Static and Dynamic and hence, you should not only write the content point but also mention recent activities/data and cases. You have answered only static portion of the question.
  • Be cautious about the words limit and try to be in words limit by changing the style of presentation.

All the best!

Feedback:
Rating :
★★★★★★★★★★ ★★★★★★★★★★
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Overall Feedback:

1) Introduction is good and appropriate.

2) Content is good apart from lack of few more points.

3) In second part of the answer requires more elaboration. 

4) Question is specifically asking for examples so please provide more example with variety of aspects and dimensions.

5) ALWAYS LEAVE SIDE MARGINS FOR THE EVALUATION AND UPLOAD YOUR ANSWER IMAGE IN VERTICAL ALIGNMENT.

All the best!

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Description

Mangroves are a group of trees and shrubs which are tolerant of saline or brackish water as well as fluctuations in the water level.

Causes of depletion of Mangroves:

  • Encroachment
    o For agriculture, industrial development and infrastructure projects.
  • Coastal water pollution from agricultural and industrial discharge hampers their growth
  • Climate change is leading to changes in the ambient conditions which are depleting the
    mangroves.
  • Local threats
    o Dams and irrigation that reduce the flow of water.
    o Overfishing.

Importance of Mangroves in maintaining coastal ecology:

 Settlement of sediments due to slowing down of tidal waters in the intertidal zone.
o This leads to stabilization of the coastline.

 Protection from storms and cyclones because of the friction offered by the dense vegetation
slows down the wind

 Mitigation of climate change due to their capacity to act as carbon sink.

 Biodiversity
o A huge variety of wildlife lives or breeds in the mangrove ecosystem, including
numerous fish, crab and shrimp species, molluscs, and mammals like sea turtles.

Hence Mangroves should be protected with utmost priority for the role they play in preservation of ecosystem and biodiversity as well as protection of humans from disasters.

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