Holocene sea level dynamics drives formation of a large atoll island in the central Indian Ocean

@article{Kench2020,
  Title = {Holocene sea level dynamics drives formation of a large atoll island in the central Indian Ocean},
  Author = {Kench, Paul and Owen, Susan and Beetham, Edward and Mann, Thomas and McLean, Roger and Ashton, Andrew},
  Editor = {},
  Year = {2020},
  Pages = {103354},
  Volume = {195},
  Doi = {10.1016/j.gloplacha.2020.103354},
  Abstract = {The impact of global environmental change on coral reef islands is uncertain with few
studies having resolved the critical controls on island formation and change. Based on
detailed, topographic surveys, sediment analysis and radiometric dating, we present a
multi-phase model of the formation of a large inhabited reef island in the central Indian
Ocean in response to Holocene sea level dynamics and transformations in reef
development and reef ecology. The initial phase of island building occurred later than
elsewhere reported in the Maldives, 2,500-2,100 years ago during the mid-Holocene
sea level highstand. The island was able to support habitation shortly thereafter.
Subsequent island expansion occurred as a consequence of relative sea-level fall and
emergence of the reef platform that forced a transition in reef flat ecology and dominant
sediment producers that contributed to island accumulation to the southwest. Smallscale
sea level oscillations (± 0.8 m) over the past two millennia has driven periods of
island accumulation, that intermittently reactivate geomorphic processes around the
island shoreline. Significantly, the multiple phases of island development have
occurred while the island has been continuously inhabited, demonstrating the adaptive
capacity of the island community to multiple phases of change. Results highlight the
complexity of reef island development and indicate that future physical trajectories will
vary depending on not only relative sea level change, but how such changes modify
water depth and wave regimes across reef surfaces, and changes in dominant
sediment producers able to contribute island building. This interrelationship differs
between sites within and between reef regions and may account for currently
expanding islands on reef surfaces.},
}

TY  - JOUR
AU  - Kench, Paul
AU  - Owen, Susan
AU  - Beetham, Edward
AU  - Mann, Thomas
AU  - McLean, Roger
AU  - Ashton, Andrew
TI  - Holocene sea level dynamics drives formation of a large atoll island in the central Indian Ocean
PY  - 2020
SP  - 103354
VL  - 195
DO  - 10.1016/j.gloplacha.2020.103354
AB  - The impact of global environmental change on coral reef islands is uncertain with few
studies having resolved the critical controls on island formation and change. Based on
detailed, topographic surveys, sediment analysis and radiometric dating, we present a
multi-phase model of the formation of a large inhabited reef island in the central Indian
Ocean in response to Holocene sea level dynamics and transformations in reef
development and reef ecology. The initial phase of island building occurred later than
elsewhere reported in the Maldives, 2,500-2,100 years ago during the mid-Holocene
sea level highstand. The island was able to support habitation shortly thereafter.
Subsequent island expansion occurred as a consequence of relative sea-level fall and
emergence of the reef platform that forced a transition in reef flat ecology and dominant
sediment producers that contributed to island accumulation to the southwest. Smallscale
sea level oscillations (± 0.8 m) over the past two millennia has driven periods of
island accumulation, that intermittently reactivate geomorphic processes around the
island shoreline. Significantly, the multiple phases of island development have
occurred while the island has been continuously inhabited, demonstrating the adaptive
capacity of the island community to multiple phases of change. Results highlight the
complexity of reef island development and indicate that future physical trajectories will
vary depending on not only relative sea level change, but how such changes modify
water depth and wave regimes across reef surfaces, and changes in dominant
sediment producers able to contribute island building. This interrelationship differs
between sites within and between reef regions and may account for currently
expanding islands on reef surfaces.
ER  -