Accreting coral reefs in a highly urbanized environment

Globally, many coral reefs have fallen into negative carbonate budget states, where biological erosion exceeds carbonate production. The compounding effects of urbanization and climate change have caused reductions in coral cover and shifts in community composition that may limit the ability of reef...

Celý popis

Uloženo v:

Podrobná bibliografie
Vydáno v:	Coral reefs Ročník 39; číslo 3; s. 717 - 731
Hlavní autoři:	Januchowski-Hartley, Fraser A., Bauman, Andrew G., Morgan, Kyle M., Seah, Jovena C. L., Huang, Danwei, Todd, Peter A.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Berlin/Heidelberg Springer Berlin Heidelberg 01.06.2020 Springer Nature B.V
Témata:	Accretion Bioerosion Biomedical and Life Sciences Bleaching Budgets Calcium carbonate Carbonates Climate change Climate effects Community composition Compounding effects Coral reefs Deposition Environmental conditions Freshwater & Marine Ecology Life Sciences Light penetration Morphology Oceanography Sea level Sea level rise Surveys Turbidity Urbanization Singapore Urbanization Singapore Reef growth Bioerosion Carbonate budget
ISSN:	0722-4028, 1432-0975
On-line přístup:	Získat plný text
Tagy:	Přidat tag Žádné tagy, Buďte první, kdo vytvoří štítek k tomuto záznamu!

Popis
Shrnutí:	Globally, many coral reefs have fallen into negative carbonate budget states, where biological erosion exceeds carbonate production. The compounding effects of urbanization and climate change have caused reductions in coral cover and shifts in community composition that may limit the ability of reefs to maintain rates of vertical accretion in line with rising sea levels. Here we report on coral reef carbonate budget surveys across seven coral reefs in Singapore, which persist under chronic turbidity and in highly disturbed environmental conditions, with less than 20% light penetration to 2 m depth. Results show that mean net carbonate budgets across Singapore’s reefs were relatively low, at 0.63 ± 0.27 kg CaCO 3 m −2 yr −1 (mean ± 1 SE) with a range from − 1.56 to 1.97, compared with the mean carbonate budgets across the Indo-Pacific of 1.4 ± 0.15 kg CaCO 3 m −2 yr −1 , and isolated Indian Ocean reefs pre-2016 bleaching (~ 3.7 kg CaCO 3 m −2 yr −1 ). Of the seven reefs surveyed, only one reef had a net negative, or erosional budget, due to near total loss of coral cover (< 5% remaining coral). Mean gross carbonate production on Singapore’s reefs was dominated by stress-tolerant and generalist species, with low-profile morphologies, and was ~ 3 kg m −2 yr −1 lower than on reefs with equivalent coral cover elsewhere in the Indo-Pacific. While overall these reefs are maintaining and adding carbonate structure, their mean vertical accretion potential is below both current rates of sea level rise (1993–2010), and future predictions under RCP 4.5 and RCP 8.5 scenarios. This is likely to result in an increase of 0.2–0.6 m of water above Singapore’s reefs in the next 80 yr, further narrowing the depth range over which these reefs can persist.
Bibliografie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14
ISSN:	0722-4028 1432-0975
DOI:	10.1007/s00338-020-01953-3