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Bahaman patch reefs: Numerous and neglected
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Abstract
Phanerozoic patch reefs are extensively studied because they are abundant and are potential reservoirs for valuable fluids. In contrast, geologic studies of modern reefs have largely focused on platform margins, leaving patch reefs comparatively neglected. What conditions favour patch‐reef development? What is their potential as reservoirs or as coral refugia under deteriorating environmental conditions? Where other environmental conditions are favourable, the availability of lithified Holocene sediment or Pleistocene rock as substrates for coral colonization appears to control patch‐reef distribution in The Bahamas. A census of patch reefs from satellite imagery of the eastern Great Bahama Bank (GBB) tallies 23 reefs/km
2
, for a total of 70,000 reefs over 3,000 km
2
. Higher resolution images of favorable areas tally up to 80 reefs/km
2
. Patch reefs accumulate sediment typically 3 m, and exceptionally 10 m, above the surrounding sea floor and amalgamate into complexes up to 2150 m long, illustrating their potential to form reservoirs. Patch‐reef corals have adapted to conditions of elevated suspended sediment, salinity and temperature, suggesting they could provide refuge for corals as platform‐margin reefs are decimated by climate change. Data on the distribution, abundance, morphology and health of patch reefs on the GBB may stimulate further research on modern patch reefs.
Title: Bahaman patch reefs: Numerous and neglected
Description:
Abstract
Phanerozoic patch reefs are extensively studied because they are abundant and are potential reservoirs for valuable fluids.
In contrast, geologic studies of modern reefs have largely focused on platform margins, leaving patch reefs comparatively neglected.
What conditions favour patch‐reef development? What is their potential as reservoirs or as coral refugia under deteriorating environmental conditions? Where other environmental conditions are favourable, the availability of lithified Holocene sediment or Pleistocene rock as substrates for coral colonization appears to control patch‐reef distribution in The Bahamas.
A census of patch reefs from satellite imagery of the eastern Great Bahama Bank (GBB) tallies 23 reefs/km
2
, for a total of 70,000 reefs over 3,000 km
2
.
Higher resolution images of favorable areas tally up to 80 reefs/km
2
.
Patch reefs accumulate sediment typically 3 m, and exceptionally 10 m, above the surrounding sea floor and amalgamate into complexes up to 2150 m long, illustrating their potential to form reservoirs.
Patch‐reef corals have adapted to conditions of elevated suspended sediment, salinity and temperature, suggesting they could provide refuge for corals as platform‐margin reefs are decimated by climate change.
Data on the distribution, abundance, morphology and health of patch reefs on the GBB may stimulate further research on modern patch reefs.
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