Indonesia - Halmahera: Tanjung Dehebra
Part of the regional summaries: Indonesia - Halmahera and Indonesia - Maluku
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North Maluku, Indonesia (NOAA CRW virtual station)Tanjung Dehebra had poor visibility (perhaps 2–3 m in Anderson's field note), brown plankton, and strong currents, yet the reef itself reads as consistently developed, built on large tabulate and foliose plate corals and massive coral boulder clusters. Two small white branching colonies on one massive are flagged as possible bleaching or partial mortality, not a wider pattern. A blind Claude computer-vision point count puts coral cover around 25%.
Tanjung Dehebra memiliki jarak pandang yang buruk (mungkin 2–3 m menurut catatan lapangan Anderson), plankton cokelat, dan arus yang kuat, namun terumbunya sendiri terbaca berkembang secara konsisten, terbangun di atas karang lembaran tabulat dan foliaseus yang besar serta gugusan bongkahan karang masif. Dua koloni bercabang putih kecil pada satu koloni masif dicatat sebagai kemungkinan pemutihan atau kematian sebagian, bukan pola yang lebih luas. Penghitungan titik buta visi komputer Claude memperkirakan tutupan karang sekitar 25%.
Terjemahan ringkasan ini oleh AI; versi bahasa Inggris yang berlaku.
These are unedited originals; edited versions will replace them.
This page shows 50 of the 103 photographs from this site, including every one the text cites.
34 of the 50 photographs on this page are shown beside the text that discusses them under "Site description" below.
Site description
Setting
Tanjung Dehebra (Halmahera dive 14) had poor visibility: Anderson logged perhaps 2–3 m, brown plankton, and strong currents.
General benthic features
Growth is dominated by large tabulate and foliose plate corals, gray-tan to salmon discs from 0.5 to well over a meter across, recurring through the entire dive and frequently the largest single subject in frame (e.g., Image 10, Image 17, Image 21, Image 25, Image 28, Image 33, Image 47, Image 50).
Massive brown-tan boulder colonies stand in clusters mid-dive (e.g., Image 13, Image 34, Image 37, Image 38, Image 43, Image 48, Image 53, Image 55).
Dense corymbose and staghorn coral thickets punctuate the plate-and-boulder matrix at several points, reading among the dive's highest single-frame covers (e.g., Image 4, Image 5, Image 15, Image 31, Image 40).
Crustose coralline pink pavement and encrusting orange-red and dark maroon sponges cover much of the remaining substrate, and a pair of frames show massive gray boulder-sponge/coral heads with feather-star crinoids perched on them (e.g., Image 9, Image 14, Image 16, Image 26).
Coral cover
- Reference: Claude CV point count (this site's photos)
- Coral cover: 25% — a blind Claude computer-vision point count of 103 of Anderson's unedited photographs (20 points per photo; water, fish, and obstructions excluded). Other computer-vision methods are listed in the method table.
Stressors
Two small, stark-white branching colonies sit on the side of a larger brown massive, distinct enough from their neighbors to flag as possible bleaching or recent partial mortality, but nothing resembling them recurs elsewhere in the dive (e.g., Image 29).
No disease, crown-of-thorns, or predation was seen in any frame.
Fish and other fauna
Anderson logged three turtles on this dive; none appears in the published photographs.
Comparisons with other data
We found no other surveys at this site as of 2026. If you would like to share yours, please email us.
Other notes
Divers appear repeatedly giving scale on the wall and over the plate fields (e.g., Image 2, Image 3, Image 12, Image 19, Image 23, Image 30, Image 46, Image 49).
Anderson's field note on visibility: “maybe 2-3 m, brown plankton, strong currents, three turtles.”
CV model comparison
More info
A few colony-focused photos raise the mean; 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.More info
DINOv3 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.| Method | Hard coral cover (%) | Photos (n) ± SE |
|---|---|---|
| In-house DINOv3 | 27.7 | n = 103 · SE 1.0 |
| CoralSCOP unedited | 34.3 | n = 103 · SE 1.4 |
| Claude | 25.0 | n = 103 · SE 2.1 |
The two computer-vision methods agree within 6.6 pp (27.7–34.3%) and read 2.7–9.3 pp above Claude's blind point count (25.0%); the headline is Claude's blind point count because no transect or manual count exists here.
See a more detailed, stand-alone version of this table.
Data & links
All images from Coral Reef Diagnostics. Data are from Coral Reef Diagnostics.
© Coral Reef Diagnostics.