When to act and how? Active vs passive restoration of mangroves in - - PowerPoint PPT Presentation

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When to act and how? Active vs passive restoration of mangroves in - - PowerPoint PPT Presentation

Aug 29, 2023 13 likes •244 views

When to act and how? Active vs passive restoration of mangroves in shrimp farming areas in Sri Lanka AH Wijesundara Wayamba University of Sri Lanka Shrimp farming is responsible for the decline of mangrove forests Abandoning culture

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When to act and how? Active vs passive restoration of mangroves in shrimp farming areas in Sri Lanka

AH Wijesundara Wayamba University of Sri Lanka

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  • Shrimp farming is responsible for the decline of

mangrove forests

  • Abandoning culture ponds in large numbers, leaving

large areas of unutilized land

  • New opportunities for restoration has emerged.
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Zone 1- Chilaw Zone 2- Arachchikattuwa Zone 3- Mundal Zone 4- Kalpitiya Zone 5- Puttalama

  • There are 31 sub zones
  • The present investigation

covered 23 sub zones

Shrimp farming zones

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Objectives

  • Review the present status of shrimp farming

industry in Puttalama district

  • Map the distribution of abandoned shrimp farms
  • Estimate the extent of abandoned shrimp farming

areas

  • Develop models for ecological restoration
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Approach

  • Map active and abandoned shrimp farms
  • Identify the floral composition of selected

areas for restoration

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Determination of potential restoration areas

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Results

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Farm Area (ha) Farm Numbers Area abandoned (ha)

Allocate for farming Operational Total farms Operational

Total 2799 1267 814 524 1532 Zone Active % Abandoned % Arachchikattuwa 66.4 33.6 Mundal 21.9 78.1 Puttalama 49.1 50.8 Kalpitiya 29.5 78.1

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Active Abandoned shrimp farms in areas surrounding Kusala, Kottage (zone 2 )

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  • Core mangroves -12

Diversity of mangroves in shrimp farming zones

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  • Magrove associates

and salt marsh vegetation

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Other Vegetation

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Undisturbed abandoned shrimp farms

  • Dominants

– Excoecaria agallocha –Sueda monoica – Salvadora persica – Rhizophora spp. –Avicennia spp. – Dominant Sapling

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Disturbed abandoned shrimp farms

– Excoecaria agallocha – A total of 19 species were recorded in abandoned shrimp farms.

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  • Approaches proposed can broadly be divided

into 2

– Abandoned shrimp farms with already occurring natural succession- Passive – Active restoration

Models for restoration

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  • Anavilundawa, Pinkattiya

Near to AnawillundawaRamsar Sanctuary

  • Seguwanthivu,Manathivu and Anaikutti area

Near to protected mangrove patches

  • Muthupanthiya

Near to protected mangrove patches

Identified areas in need of active restoration

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  • Almost all big farms are abandoned.
  • 1532 ha are abandoned
  • Active mobilisation of social groups along with the

local skills and knowledge and

  • Placement of policies and political which will result

in meaningful restoration

Conclusions

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Acknowledgements

  • IUCN - Sri Lanka
  • National Aquaculture Development Authority

(NAQDA) – Sri Lanka

  • Department of Forest – Sri Lanka
  • Wayamba University of Sri Lanka
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Thank you