Maldives - Raa Atoll
Part of the regional summaries: Maldives - North (Haa Alif to Baa / Lhaviyani) and Maldives
More info
Maldives (NOAA CRW virtual station)We took part in both of Coral Reef CPR's 2016 bleaching surveys on Raa's Huruvahli and Villingili reefs, which recorded 46% live hard coral in April 2016, during the bleaching, and 26% by July 2016 (Coral Reef CPR data). The closest long-term transects (LGT1-LGT4), about 39 km away, averaged 30% hard coral in their latest survey round, in February 2009.
ރ. އަތޮޅު (Raa) ގެ Huruvahli އާއި Villingili ފަރުތަކުގައި Coral Reef CPR އިން 2016 ގައި ކުރި ހިރިގާ ހުދުވުމުގެ ދެ ސާވޭގައިވެސް އަހަރެމެން ބައިވެރިވީމެވެ. އެ ސާވޭތަކުގައި، ހިރިގާ ހުދުވަމުން ދިޔަ 2016 ގެ އޭޕްރީލްގައި ދިރިހުރި ހަރު ހިރިގާ 46% ރެކޯޑްކުރިއިރު، 2016 ގެ ޖުލައި ވަންދެން އެ މިންވަރު 26% އަށް ދަށްވިއެވެ (Coral Reef CPR ގެ ޑޭޓާ). އެންމެ ކައިރި ދިގު މުއްދަތުގެ ޓްރާންސެކްޓްތައް (LGT1-LGT4) ހުރީ ގާތްގަނޑަކަށް 39 km ދުރުގައެވެ. 2009 ގެ ފެބްރުއަރީގައި ކުރި އެންމެ ފަހުގެ ސާވޭ ބުރުގައި އެ ޓްރާންސެކްޓްތަކުގެ ހަރު ހިރިގާގެ އެވްރެޖަކީ 30% އެވެ.
AI translation of this summary; the English is authoritative. (low confidence)
Site description
Setting
Raa Atoll is in the northern Maldives (5.60 N, 72.95 E).
Coral cover
- Coral Reef CPR's April and July 2016 bleaching surveys on Huruvahli and Villingili reefs recorded 46% live hard coral in April 2016, during the bleaching (14 transects), and 26% in July 2016, after it (27 transects); the data are Coral Reef CPR's, credited to them.
Stressors
Satellite five-year mean annual maximum heat stress: 2.2 degree heating weeks at this site's Maldives virtual station.
Comparisons with other data
Four long-term transects coded LGT1-LGT4 were surveyed repeatedly between 2007 and 2009, giving 28 records. Hard coral cover across them averaged about 29%, varying by station: LGT1 and LGT2 ran in the mid-30s, while LGT4 sat near 14%. Annual means were 21% in 2007 and 36% in 2008; the latest round, in February 2009, averaged 30% across the four stations (one survey each). Bleaching was logged at those stations in all three years, affecting up to a third of colonies at LGT4 in 2007, and crown-of-thorns starfish appeared at trace levels (0.2%) at LGT1 in 2007 and 2008 — recorded at LGT stations 39 km away, not at this site.
Dive record
We took part in both of Coral Reef CPR's 2016 bleaching surveys here, on Huruvahli and Villingili reefs, in April and July 2016.
No underwater photographs from this site are on file.
Independent surveys nearby
These 6 survey records have no reef-level position, so no distance can be given; they recorded hard coral cover ranging 8.7–76% in 2016. Per-year values are not available for these stations, so no trend is stated. Values above 70% are best-patch surveys, not site means.
Collected by other programs using different methods, so these are context for the figures above, not a like-for-like comparison. Where a station was surveyed more than once, the cell shows either the range of its values or, as a single value, the mean of surveys made in one year. Station names are not dive-site names. Values above 70% are marked “best patch”: surveys often target the densest coral on a reef, so these may overstate the site as a whole.
| Agency | Site / location | Date | Hard coral cover (%) | Distance |
|---|---|---|---|---|
| Coral Reef CPR | Huruvahli (Raa) | 2016-04 | 49% (37–76%) n=9 best patch | — |
| Coral Reef CPR | Villingili (Raa) | 2016-04 | 39% (27–48%) n=5 | — |
| Coral Reef CPR | Huruvahli lagoon (Raa) | 2016-07 | 62% (56–67%) n=2 | — |
| Coral Reef CPR | Huruvahli NW (Raa) | 2016-07 | 20% (14–33%) n=8 | — |
| Coral Reef CPR | Huruvahli SW (Raa) | 2016-07 | 20% (8.7–32%) n=12 | — |
| Coral Reef CPR | Villingili (Raa) | 2016-07 | 38% (32–41%) n=5 | — |
Data & links
Data on this page are from the organizations named in the data sources above, not Coral Reef Diagnostics; Coral Reef Diagnostics has no coral cover estimate of its own at this site.
© Coral Reef Diagnostics.