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Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
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Internal relocation as a relevant and feasible adaptation strategy in Rangiroa Atoll, French Polynesia.

Virginie K E Duvat1, Alexandre K Magnan2,3, Lydie Goeldner-Gianella4

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Internal relocation is a viable climate adaptation strategy for atoll islands facing sea-level rise. This study confirms its physical relevance and societal feasibility on Rangiroa Atoll, supporting in situ adaptation pathways.

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Area of Science:

  • Climate Change Adaptation
  • Coastal Geomorphology
  • Environmental Planning

Background:

  • Atoll islands confront escalating coastal risks like erosion and flooding due to climate change and sea-level rise.
  • Adaptation strategies include hard protection, nature-based solutions, and island raising, but internal relocation has been overlooked.
  • Low-lying coastal areas face dual threats of climate risks and diminishing viable land.

Purpose of the Study:

  • To assess the physical and societal feasibility of internal relocation as a climate adaptation strategy for atoll islands.
  • To apply a two-fold assessment framework to Rangiroa Atoll, French Polynesia.
  • To determine if internal relocation can serve as a robust in situ adaptation pathway.

Main Methods:

  • A two-fold assessment framework was applied to Rangiroa Atoll.
  • Physical relevance was evaluated by assessing future settlement suitability of island elevations.
  • Societal feasibility was examined through political-institutional, socio-economic conditions, and community willingness.

Main Results:

  • Internal relocation was found to be both physically relevant and societally feasible on Rangiroa Atoll.
  • Specific islands on Rangiroa Atoll possess adequate elevation for future settlements.
  • Favorable political-institutional and socio-economic conditions, alongside community willingness, support relocation.

Conclusions:

  • Internal relocation is a crucial, yet previously disregarded, climate adaptation strategy for atoll nations.
  • The study demonstrates the relevance and feasibility of internal relocation on Rangiroa Atoll.
  • Internal relocation should be integrated as a key component of robust in situ adaptation strategies for atolls.