Coral Reef Diagnostics

Indonesia - Komodo NP: Tatawa Kecil

Reef Check Foundation
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05
Photo: Anderson Mayfield/Coral Reef Diagnostics
Country
Survey date(s)
2019-01-27
Coordinates
-8.5297, 119.6275
Coral cover
32%
Claude computer vision (83 edited photos) · other methods below · median 33%
Observations
None tagged; see Stressors below
Heat stress
Most recent heat load record
26 Oct 2026 · No heat stress
5-year thermal stress load
5-year mean max. degree heating weeks (DHW)
2021–2025
NOAA Coral Reef Watch — East Nusa Tenggara 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 infoEast Nusa Tenggara (NOAA CRW virtual station)
Photographs
96
46 shown on this page
Site summary
Read this summary in:

A genuinely dense but visibly disturbed Acropora reef in Komodo: healthy tables and colorful thickets of branching coral stand beside and on top of beds of bone-white broken Acropora rubble. Anderson did not carry the slate on this dive and logged it from memory; the photographs show many small reef fish.

Max. depth dived
22.3 m
Water temp. during survey
26.7°Cii
-1.6°C vs the 2019 mean sea temperature (28.3°C)
ii Logged water temperature of the dive (dive-computer average), 27 January 2019 (dive log); the dive computer's minimum was 26.1°C.
Bottom time
60 min
in at 07:34

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

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

6 of the 46 photographs on this page are shown beside the text that discusses them under "Site description" below.

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Photo credit & attribution

Site description

General benthic features

Anderson's photographs show a genuinely dense but visibly disturbed acroporid reef; the log calls it a spectacular site for hard coral, with large areas at 5-9 m of 80-90% coral cover, including low-lying acroporids and finger poritids. One frame is a single large Acropora table, roughly a meter across, dark brown with a pale living rim, sitting directly on a bed of bone-white broken Acropora branches — the table is healthy, the ground it stands on is dead skeleton (e.g., Image 2).

A wide slope frame repeats that pattern at scale: a pavement of white branch rubble and old consolidated skeleton with scattered live brown foliose colonies, a tan plating colony, and low green algal turf, dropping into blue water with small planktivores above it (e.g., Image 3).

A substrate close-up in the same vein is mostly white Acropora fragments, dark red foliose macroalgae, pink and lavender crustose coralline algae, a yellow-polyped plating coral, and a small lavender soft coral (e.g., Image 1).

Against that, other frames show the reef Anderson described: a vivid salmon-red branching Acropora with white-tipped branchlets, framed by green digitate Acropora, mustard finger coral, a purple encrusting colony, and gray-brown corymbose colonies at near-continuous cover; and a mid-range garden of Acropora thickets, feathery soft corals, a broad green encrusting sheet, and orange cup coral (e.g., Image 4, Image 5).

Coral cover

Stressors

The photo review resolved no bleaching, disease lesions, or predation scars, and nothing man-made appears; however, a computer-vision point count called 0.7% of coral points bleached (3 of 83 photos). On one green-brown knobby colony, more than a dozen knob tops are bare and white, with sharp edges against the living tissue around them: recently dead, cause not stated (e.g., Image 35).

Read the rubble as physical breakage on a current-swept slope, not as a diagnosed mortality event; these frames cannot date it.

Fish and other fauna

Reef fish in frame are small — damselfish and anthias. Anderson's log records two or three green turtles, a Napoleon wrasse, a manta ray toward the end of the dive, scorpionfish, and nudibranchs.

Comparisons with other data

Turicchia et al. (2018) surveyed this site (E Tatawa Kecil). Within 5 km, seven independent stations (Reef Check and WWF-US / WWF-Indonesia) recorded station-year means of 8.8–59% hard coral cover between 2016 and 2020; the nearest, Reef Check at Siaba Besar (Sector 1), 1.82 km away, read a mean of 51% in 2020.

Dive record

Anderson dived this site once, on 27 January 2019 (07:34, 60 min, max 22.3 m, average depth 7.9 m, 26.7°C dive-computer average). Anderson did not carry the slate on this dive and logged it from memory; the gallery is a selection of the photographs from the dive.

CV model comparison

Mean 32%, median 33% across 83 photos.
More infoA few low-cover photos (sand, rubble, or open bottom) pull the mean down; the median is the typical photo. No computer-vision method yet estimates coral cover accurately on new images, so treat this as indicative rather than a measurement; it is revised as the methods improve.
Headline: Claude computer vision — a blind point count of this site's own photographs.
More infoDINOv3 and CoralSCOP were run on the same photos and are listed for comparison. No diver transect exists for this trip, so agreement between the rows is not accuracy, and no computer-vision method yet estimates coral cover accurately on new images; treat every row as indicative.
MethodHard coral cover (%)Photos (n) ± SE
In-house DINOv328.8n = 83 · SE 1.2
CoralSCOP edited37.9n = 83 · SE 2.0
Claude (edited photos)32.1n = 83 · SE 2.5

The two computer-vision methods differ by 9.1 pp (28.8–37.9%) and read within 5.8 pp of Claude's blind point count (32.1%); the headline is Claude's blind point count because no transect or manual count exists here.

Independent surveys nearby

Data availability near this site
Agency / programYear(s)Stations / distanceLink
Reef Check20205 stations, 1.82–3.47 kmRecords ↓
WWF-US / WWF-Indonesia20162 stations, 2.43–4.61 kmRecords ↓
Hard coral cover over time — this site and 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%15%30%45%60%201620182020WWF-US / WWF-Indonesia 2016: 40%WWF-US / WWF-Indonesia 2016: 59%Reef Check 2020: 8.8%Reef Check 2020: 10%Reef Check 2020: 47%Reef Check 2020: 48%Reef Check 2020: 51%Coral Reef Diagnostics 2019: 32%Year-averaged across all programs: illustrative only; the programs differ in stations and method, so no trend is claimed (3 years)
WWF-US / WWF-Indonesia Reef Check Coral Reef DiagnosticsYear-average (illustrative only, programs differ)

Within 5 km, 7 independent survey stations recorded hard coral cover in 11 surveys between 2016 and 2020. The most recent nearby survey is from 2020, so these values predate recent heat stress. This site's own estimate (32%) sits 15 points below the range of these station-year means up to 2 km away (47–51%); the methods differ, so the comparison is context, not a like-for-like test.

Collected by other programs using different methods (Reef Check uses point-intercept transects), 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.

Independent survey data near this site
AgencySite / locationDateHard coral cover (%)DistanceLink
WWF-US / WWF-IndonesiaTNK06201640%2.43 kmAmkieltiela, Abdillah T, Amkieltiela A, Andradi-Brown D, Lazuardi E. 2016. Komodo MPA. MERMAID
WWF-US / WWF-IndonesiaTNK08201659%4.61 kmAmkieltiela, Abdillah T, Amkieltiela A, Andradi-Brown D, Lazuardi E. 2016. Komodo MPA. MERMAID
Reef CheckSiaba Besar (Sector 1)202051% (44–59%, 2 surveys, Mar–Aug 2020)1.82 km—
Reef CheckSiaba Besar (Sector 2)202047% (41–52%, 2 surveys, Mar–Aug 2020)1.82 km—
Reef CheckMawan (Sector 1)202010% (2 surveys)2.63 km—
Reef CheckMawan (Sector 2)20208.8%2.63 km—
Reef CheckPengah Kecil (Sector 1) SW Side202048% (2 surveys)3.47 km—

Data & links

All images from Coral Reef Diagnostics. Data are from Coral Reef Diagnostics and the organizations named in the data sources above.

© Coral Reef Diagnostics.

References

  1. Turicchia E, Hoeksema BW, Ponti M (2018). The coral-killing sponge Chalinula nematifera as a common substrate generalist in Komodo National Park, Indonesia. Marine Biology Research 14:827-833. DOI