Citation:

PANGAEA.983427

Name: Seagrass community data derived from field surveys at Hera Bay, Timor-Leste, conducted 30 November 2022 and 08 March 2023
Published: 2025-09-10
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Seagrass; seagrass ecosystems; Timor-Leste

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Published: 2025-09-10 • DOI registered: 2025-10-09

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Abstract:

The area of interest of approximately 590 ha was surveyed by boat and by foot at low tide between 30th October 2022 and 8th March 2023, resulting in 275 spot-checks. For the boat-based subtidal surveys, at each mapping point, a GoPro® drop–camera assembly (incl. frame with 0.25 m2 quadrat in field of view), was used to visually assess the seabed and the photoquadrat footage captured for post-field analysis. Within a 3 m radius of an individual point, between 1 and 4 geo-located photoquadrats were collected (742 total). Subtidal assessments were conducted using a real time drop-camera slaved to a surface tablet, to ensure photoquadrats were sufficiently spaced apart and the vision captured was suitable for post-field analysis. For the foot-based intertidal surveys, at each mapping point, a spot-check was conducted by collecting three photoquadrat taken haphazardly within 5-10 m2 area. All individual photoquadrats were assessed for seagrass percentage cover, species composition, sediment classification, macroalgae abundance and epiphyte abundance. These various data fields were then aggregated for each mapping point by taking the mean of the numerical fields and most occurring value for the text field. Additional mapping points were included from Seagrass Spotter.

Keyword(s):

Seagrass; seagrass ecosystems; Timor-Leste

Other version:

Gomes, Jemima; Lay, Cecilia; Ximenes, Patricio; Dos Reis Pereira, Advento F; Martins, Joãozinho Dedito; Amaral, Nelson; Bartlett, Alex; Lewis, Ryan; Langlois, Lucas; Yoshida, Rudi L; McKenzie, Len (2025): Seagrass community data derived from field surveys at Hera Bay, Timor-Leste, conducted 30 November 2022 and 08 March 2023 provided as ArcMap shapefile [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.983426

Project(s):

IKI Seagrass Ecosystem Services Project (PROJECT1363-1)

Coverage:

Median Latitude: -8.527701 * Median Longitude: 125.694622 * South-bound Latitude: -8.536056 * West-bound Longitude: 125.666631 * North-bound Latitude: -8.515949 * East-bound Longitude: 125.714239

Date/Time Start: 2022-11-30T00:00:00 * Date/Time End: 2023-03-08T00:00:00

Minimum Elevation: -12.0 m * Maximum Elevation: 0.0 m

Event(s):

Seagrass_1 * Latitude: -8.526314 * Longitude: 125.707874 * Date/Time: 2022-12-01T15:20:00 * Elevation: -1.0 m

Seagrass_1J * Latitude: -8.525586 * Longitude: 125.709979 * Date/Time: 2022-12-01T10:50:00 * Elevation: -0.5 m

Seagrass_1Z * Latitude: -8.524013 * Longitude: 125.708794 * Date/Time: 2022-12-01T11:30:00 * Elevation: -1.2 m

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event
2	Latitude of event	Latitude
3	Longitude of event	Longitude
4	Date/Time of event	Date/Time
5	Elevation of event	Elevation	m
6	Sample code/label	Sample label		McKenzie, Len J	Visual observation	FID
7	Sample code/label	Sample label		McKenzie, Len J	Visual observation	Mapping point ID
8	Location	Location		McKenzie, Len J	Visual observation
9	Sample source	Sample source		McKenzie, Len J	Visual observation	In-situ Photoquadrat collected on foot at low tide
10	Sample source	Sample source		McKenzie, Len J		Drop-camera Photoquadrat collected by boat with drop-camera set up
11	Sample source	Sample source		McKenzie, Len J		Grab van Veen grab taken at the mapping point
12	Sample source	Sample source		McKenzie, Len J		Spotter Data from Seagrass Spotter
13	Sediment type	Sediment		McKenzie, Len J	Visual observation
14	Seagrass, presence/absence	Seagr		McKenzie, Len J	Visual observation
15	Observer	Observer		McKenzie, Len J		Observer Observer who produced the data
16	Seagrass, cover	Seagr cov	%	McKenzie, Len J	Visual observation
17	Cymodocea rotundata, presence/absence	C. rotundata		McKenzie, Len J	Visual observation
18	Cymodocea serrulata, presence/absence	C. serrulata		McKenzie, Len J	Visual observation
19	Enhalus acoroides, presence/absence	E. acoroides		McKenzie, Len J	Visual observation
20	Halophila decipiens presence/absence	H. decipiens		McKenzie, Len J	Visual observation
21	Halophila ovalis, presence/absence	H. ovalis		McKenzie, Len J	Visual observation
22	Halodule pinifolia, presence/absence	H. pinifolia		McKenzie, Len J	Visual observation
23	Halodule uninervis, presence/absence	H. uninervis		McKenzie, Len J	Visual observation
24	Syringodium isoetifolium, presence/absence	S. isoetifolium		McKenzie, Len J	Visual observation
25	Thalassodendron ciliatum, presence/absence	T. ciliatum		McKenzie, Len J	Visual observation
26	Thalassia hemprichii, presence/absence	T. hemprichii		McKenzie, Len J	Visual observation
27	Cymodocea rotundata	C. rotundata	%	McKenzie, Len J	Visual observation
28	Cymodocea serrulata	C. serrulata	%	McKenzie, Len J	Visual observation
29	Enhalus acoroides	E. acoroides	%	McKenzie, Len J	Visual observation
30	Halophila decipiens	H.decipiens	%	McKenzie, Len J	Visual observation
31	Halophila ovalis	H. ovalis	%	McKenzie, Len J	Visual observation
32	Halodule pinifolia	H. pinifolia	%	McKenzie, Len J	Visual observation
33	Halodule uninervis	H. uninervis	%	McKenzie, Len J	Visual observation
34	Syringodium isoetifolium	S. isoetifolium	%	McKenzie, Len J	Visual observation
35	Thalassodendron ciliatum	T. ciliatum	%	McKenzie, Len J	Visual observation
36	Thalassia hemprichii	T. hemprichii	%	McKenzie, Len J	Visual observation
37	Epiphytes, cover	Epiphytes cov	%	McKenzie, Len J	Visual observation	blank if seagrass absent or could not be assessed from photo
38	Algae, cover	Algae cov	%	McKenzie, Len J	Visual observation	blank if could not be assessed from photo
39	Algae species	Algae		McKenzie, Len J	Visual observation
40	Comment	Comment		McKenzie, Len J

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

10514 data points

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