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Surveys of Octocoral communities, benthic cover and environmental factors on coral reefs of Hong Kong

Created 24/06/2017

Updated 09/10/2017

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All surveys were carried out by the principal researcher using Rapid Ecological Assessment. The dataset comprises 41 surveys from 21 reef locations, recording 42 species in 23 genera (dominated by azooxanthellate taxa).

On each reef, 1-3 sites were surveyed with up to 5 transects (usually 200-300m long, 1-3m wide for 10-15 minutes) per site at pre-defined depths (1-3m, 3-8m, 8-13m, 13-18m and reef flat).

Taxa recorded: octocorals (soft corals, gorgonians, sea fans, sea whips, sea pens, leather corals, arborescent octocorals, blue coral, stoloniferans), black and wire coral. Note that species are mostly at generic level.

Site variables comprise: visibility (a modified Secchi technique - estimating maximum visible distance of a bright object in metres); depth; exposure (very exposed, protected, exposed, moderate); orientation (E, NNE, etc.); formation (Point, Face, Bay/Inlet, Channel); slope angle (assigned to 5° categories); flowspeed (estimated by 5 timings of the traveling speed of suspended particles along a ruler at cm/second); wave exposure (0=sheltered to 4=very exposed); sediment deposit (0=none, 1=thin layer, 2=considerable, 3=thick layer); rubble % cover; sand % cover.

Visual estimates of overall abundance (percent cover) were estimated in 2.5% increments from 1-10%, 5% increments from 10-30% and 10% increments over 30%). Categories are: hard corals, soft corals, dead coral, turf algae, coralline algae, macroalgae (conspicuous macroalgae - Halimeda and sargassum - were recorded separately), and total percent cover including sand and silt.

Octocoral genera (in some cases species) were given a taxon abundance ranking (0=absent, 1=rare, 2=uncommon, 3=common, 4=abundant, 5=dominant).

Zooxanthellate and azooxanthellate richness was calculated based on the numbers of octocoral taxa with (or without) zooxanthellae.

Where applicable, samples taken for taxonomic purposes are noted .

Site locations: Bokhara Rocks, Breakers Rock, Fo Shek Chau, Junk Bay, Kung Chau, Lo Chau Pak Poi, Long Ke Wan, Luk Chau, Luk Chau Wan, North Ninepin, Pak Shau, Ping Chao, Po Toi, Sham Wan, South Ninepin, Tai Tau Chau, Waglan.

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Field Value
Title Surveys of Octocoral communities, benthic cover and environmental factors on coral reefs of Hong Kong
Language English
Licence Other
Landing Page https://devweb.dga.links.com.au/data/dataset/8a297eea-cc9b-49c9-a95b-6a5c18e8a239
Contact Point
Australian Institute of Marine Science
adc@aims.gov.au
Geospatial Coverage {"type": "Polygon", "coordinates": [[[114.07, 22.547], [114.4252, 22.547], [114.4252, 22.1], [114.07, 22.1], [114.07, 22.547]]]}
Data Portal data.gov.au

Data Source

This dataset was originally found on data.gov.au "Surveys of Octocoral communities, benthic cover and environmental factors on coral reefs of Hong Kong". Please visit the source to access the original metadata of the dataset:
https://devweb.dga.links.com.au/data/dataset/surveys-of-octocoral-communities-benthic-cover-and-environmental-factors-on-coral-reefs-of-hong

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No duplicate datasets found.