Coral Reef Diagnostics

Maldives - South Male Atoll

Reef Check Foundation
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05
Country
Date(s) visited
2016-01-14
2016-01-15
2016-01-16
2016-01-17
2016-01-18
2016-01-19
2017-05-16
2017-05-17
2017-05-18
2017-05-19
2017-05-22
2017-05-23
Coordinates
3.9500, 73.5000
Approximate position.
Coral cover
5.5%
newest survey within 0.5 km, not this site: XL Catlin Seaview Survey, transect 37035 station, 2017-03-31, 0.40 km away
Observations
None tagged; see Stressors below
Heat stress
Most recent heat load record
26 Oct 2026 · Bleaching Watch
5-year thermal stress load
5-year mean max. degree heating weeks (DHW)
2021–2025
NOAA Coral Reef Watch — Maldives virtual station
i 5-year mean max. DHW is the mean of the annual maximum DHWs over the five complete years named above, not conditions today.
More infoMaldives (NOAA CRW virtual station)
Site summary
Read this summary in:

South Male Atoll carries no photographs or cover figure of its own. The 17 Reef Check station-year records within 10 km (33 surveys, 2012-2025) ranged from 8.8% to 31% hard coral, averaging 23%; closer in, XL Catlin Seaview Survey transects recorded 5.5% to 38% (2015-2017), and Montefalcone et al. (2020) recorded 76% at Cocoa Corner in 2015, a best-patch value that may overstate the reef as a whole.

Sea surface temp. (satellite)
29.5°C
mean; range 29.1–30.0°C
satellite sea surface temperature (SST), mean of the 12 trip dates (NOAA Coral Reef Watch, Maldives), not an in-water reading; it is the warmest-pixel (90th percentile) reading in the station area and can run 1–1.5°C above the reef

Six independent survey stations shown with the program’s logo — click one to see how far it is from this site.

Seven other CRD dive sites with their own pages within 5 km shown in orange — click a marker to open its page.

Site description

Setting

South Male Atoll is a central Maldivian atoll (3.95 N, 73.50 E), immediately south of North Male across the Vaadhoo Channel.

Coral cover

Stressors

Satellite five-year mean annual maximum heat stress at NOAA Coral Reef Watch's Maldives virtual station: 2.2 degree heating weeks.

Comparisons with other data

Gulhi Island Backreef, the closest Reef Check site, 5.04 km away, read 19% in 2022. At 5 km this describes the surrounding area, not this reef. Across all 17 Reef Check station-year records within 10 km (33 surveys, 2012-2025), hard coral ranged from 8.8% to 31%, averaging 23%. Other programs recorded higher values closer to this point: 38% on XL Catlin Seaview Survey transect 37036 (2015, 1.13 km) and 76% at Cocoa Corner (Montefalcone et al. 2020; 2015, 3.52 km), a best-patch value: surveys often target a coral-dense part of a reef, so it may overstate the reef as a whole.

Independent surveys nearby

Data availability near this site
Agency / programYear(s)Stations / distanceLink
Montefalcone et al. (2020)20151 station, 3.52 kmRecords ↓
Montefalcone et al. 20262023–20253 stations, 2.83–4.51 kmRecords ↓
XL Catlin Seaview Survey2015–20172 stations, 0.40–1.13 kmRecords ↓
Hard coral cover over time — every independent station within 5 km. Programs are shown separately because they use different methods at different stations; the lines are not one comparable series.
0%20%40%60%80%201520202025XL Catlin Seaview Survey 2015: 7.1%XL Catlin Seaview Survey 2015: 38%XL Catlin Seaview Survey 2017: 5.5%Montefalcone et al. (2020) 2015: 76%Montefalcone et al. 2026 2023: 72%Montefalcone et al. 2026 2024: 43%Montefalcone et al. 2026 2024: 60%Montefalcone et al. 2026 2025: 37%Montefalcone et al. 2026 2025: 39%Montefalcone et al. 2026 2025: 43%Year-averaged across all programs: illustrative only; the programs differ in stations and method, so no trend is claimed (5 years)
XL Catlin Seaview Survey Montefalcone et al. (2020) Montefalcone et al. 2026Year-average (illustrative only, programs differ)

Within 5 km, 6 independent survey stations recorded hard coral cover in 10 records between 2015 and 2025. Of the 4 stations surveyed in more than one year, 3 were scored by divers or by people annotating photographs: 3 declined (by 4.0–35 points) between their first and latest surveys. The other 1 was scored by automated image analysis: changed by 7 points or less, inside the 7-point method-noise floor (inconclusive). Two stations have the longest records (2 years each); one, transect 37035 (XL Catlin Seaview Survey, 0.40 km away), went from 7.1% in 2015 to 5.5% in 2017. Since 2021, station-year means average 44% (range 37–60%; n = 5 station-years from 5 records); 1 best-patch value above 70% is left out, as it is not a site mean.

Collected by other programs using different methods (the XL Catlin Seaview Survey uses photo-transects with automated image annotation), 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.

Independent survey data near this site
AgencySite / locationDateHard coral cover (%)DistanceLink
XL Catlin Seaview Surveytransect 370352015–20175.5–7.1% (2 surveys)0.40 kmdoi:10.14264/uql.2019.930
XL Catlin Seaview Surveytransect 37036201538%1.13 kmdoi:10.14264/uql.2019.930
Montefalcone et al. (2020)Cocoa Corner201576% best patch3.52 kmdoi:10.3389/fmars.2020.00587
Montefalcone et al. 2026Cocoa Beyru2023–202537–72% (2 surveys) best patch4.51 kmdoi:10.1007/s00338-026-02850-x
Montefalcone et al. 2026Kuda Giri Wreck2024–202539–43% (2 surveys)2.83 kmdoi:10.1007/s00338-026-02850-x
Montefalcone et al. 2026Bajiy Giri2024–202543–60% (2 surveys)4.10 kmdoi:10.1007/s00338-026-02850-x

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.

References

  1. Montefalcone M, Morri C, Bianchi CN (2020). Influence of Local Pressures on Maldivian Coral Reef Resilience Following Repeated Bleaching Events, and Recovery Perspectives. Frontiers in Marine Science 7:587. PDF
  2. Montefalcone M, Bianchi CN, Morri C, Ahmed H, Pancrazi I (2026). Outcomes of the fourth global coral bleaching (2023–2024) in the Maldives. Coral Reefs. DOI
  3. Gonzalez-Rivero M, et al. (2019). Seaview Survey photo-quadrat and image classification dataset. The University of Queensland (UQ eSpace) data collection. DOI