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PeerJ
2022 Oct 06;10:e13634. doi: 10.7717/peerj.13634.
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Recent deterioration of coral reefs in the South China Sea due to multiple disturbances.
Xiao J
,
Wang W
,
Wang X
,
Tian P
,
Niu W
.
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More frequent global warming events, biological disasters, and anthropogenic activities have caused extensive damage to coral reefs around the world. Coral reefs in the Xisha Islands (also known as the Paracel Islands) have been damaged following rounds of heatwaves and crown-of-thorns starfish (CoTS) outbreaks over recent decades. Based on a comprehensive community survey in 2020, we determined a diagnosis for the present state of six coral regions in the Xisha Islands. The findings suggested that these regions had a total of 213 species of scleractinian corals belonging to 43 genera and 16 families. Living coral coverage across sites was widely divergent and ranged from 0.40% (IQR: 7.74-0.27%) in Panshi Yu to 38.20% (IQR: 43.00-35.90%) in Bei Jiao. Coral bleaching prevalence was 23.90% (IQR: 41.60-13.30%) overall and topped out at 49.30% (IQR: 50.60-48.10%) in Bei Jiao. Five of the coral regions (all but Yongxing Dao) were under threat of CoTS outbreaks. High mortality combined with excellent recruitment rates suggested potential rehabilitation after recent deterioration. We employed a quantifiable Deterioration Index (DI) to evaluate the intensity of deterioration of coral reefs in the Xisha Islands. The results showed that Yongxing Dao and Langhua Jiao had low recent deterioration (DIrecent = 0.05, IQR: 0.07-0.02 and 0.04, IQR: 0.11-0.01, respectively), while Bei Jiao, Yongle Atoll, Yuzhuo Jiao, and Panshi Yu had high recent deterioration (DIrecent > 0.16). Different monitoring sites within the same coral region were heterogeneous with regards to all above indexes. Moreover, we reviewed and discussed potential disturbances that threaten the health of the Xisha Islands' corals. It is crucial to identify severely afflicted areas and find successful methods to better manage coral reef health in this region.
Figure 1. Six regions in the Xisha Islands with 44 coral reef monitoring sites denoted by red dots.
Figure 2. Dimensional difference of health indicators across different monitoring sites in the Xisha Islands.
Figure 3. Deterioration Index recent values (DIrecent) of 43 survey sites.Inset map shows the location of different monitoring sites and regions with numbers and colors.
Figure 4. Sea surface temperature (SST) by month (A) and degree heating week (DHW) time series graph (B) of Xisha Islands.MMM SST: maximum monthly mean SST, threshold SST: MMM SST + 1 °C. No stress: SST ⤠MMM SST; bleaching watch: MMM SST < SST < threshold SST; bleaching warning: SST ⥠threshold SST and 0 < DHW < 4, possible bleaching; alert level 1: SST ⥠threshold SST and 4 ⤠DHW < 8, significant bleaching likely; alert level 2: SST ⥠threshold SST and DHW ⥠8, severe bleaching and significant mortality likely.
Figure 5. Crown-of-thorns starfish (CoTS) of Xisha Islands.(A) Spatial distribution and density (ind. per 100 m2) of crown-of-thorns starfish (CoTS) across six coral regions. (B and C) CoTS are attacking corals, arrows point the bleaching or dead tissues.
Ateweberhan,
Climate change impacts on coral reefs: synergies with local effects, possibilities for acclimation, and management implications.
2013, Pubmed
Ateweberhan,
Climate change impacts on coral reefs: synergies with local effects, possibilities for acclimation, and management implications.
2013,
Pubmed
Ben-Tzvi,
Deterioration Index (DI): a suggested criterion for assessing the health of coral communities.
2004,
Pubmed
Bruno,
Regional decline of coral cover in the Indo-Pacific: timing, extent, and subregional comparisons.
2007,
Pubmed
De'ath,
The 27-year decline of coral cover on the Great Barrier Reef and its causes.
2012,
Pubmed
,
Echinobase
Díaz-Pérez,
Coral Reef Health Indices versus the Biological, Ecological and Functional Diversity of Fish and Coral Assemblages in the Caribbean Sea.
2016,
Pubmed
Donner,
Global assessment of coral bleaching and required rates of adaptation under climate change.
2005,
Pubmed
Dwivedi,
Analysis of small sample size studies using nonparametric bootstrap test with pooled resampling method.
2017,
Pubmed
Halpern,
A global map of human impact on marine ecosystems.
2008,
Pubmed
Hoegh-Guldberg,
Coral reefs under rapid climate change and ocean acidification.
2007,
Pubmed
Hughes,
Spatial and temporal patterns of mass bleaching of corals in the Anthropocene.
2018,
Pubmed
Hughes,
Climate change, human impacts, and the resilience of coral reefs.
2003,
Pubmed
Hughes,
Coral reefs in the Anthropocene.
2017,
Pubmed
Kayal,
Predator crown-of-thorns starfish (Acanthaster planci) outbreak, mass mortality of corals, and cascading effects on reef fish and benthic communities.
2012,
Pubmed
,
Echinobase
Kroeker,
Impacts of ocean acidification on marine organisms: quantifying sensitivities and interaction with warming.
2013,
Pubmed
McCook,
Adaptive management of the Great Barrier Reef: a globally significant demonstration of the benefits of networks of marine reserves.
2010,
Pubmed
,
Echinobase
Morrison,
Save reefs to rescue all ecosystems.
2019,
Pubmed
Nolan,
Widespread bleaching in the One Tree Island lagoon (Southern Great Barrier Reef) during record-breaking temperatures in 2020.
2021,
Pubmed
Pielou,
Species-diversity and pattern-diversity in the study of ecological succession.
1966,
Pubmed
Sakai,
Bleaching and post-bleaching mortality of Acropora corals on a heat-susceptible reef in 2016.
2019,
Pubmed
Timmers,
There's no place like home: crown-of-thorns outbreaks in the central pacific are regionally derived and independent events.
2012,
Pubmed
,
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