Brief description
The sub-tropical Houtman Abrolhos Islands and associated reefs are located approximately 60 km offshore from the mid-west coast of Western Australia on the edge of the continental shelf between 28˚15’S and 29˚S. The Houtman Abrolhos comprise three main island groups that span approximately 100 km in a north-south direction. From south to north they are the Pelsaert, Easter and Wallabi groups. From late May to early June 2007, stereo-video surveys were conducted at three sites within each island group). This data was used with data from Ningaloo and Abrolhos regions in a larger study that compared the assemblage composition, relative abundance and size of fishes sampled using Baited remote underwater stereo-video (stereo BRUV) and Diver-operated stereo-video systems (stereo DOV).Lineage
Statement: Abrolhos Islands data was one year of multi-year survey
Statement: Within each region the sampling design was made orthogonal to the two sampling methods to be compared. The design of the studies within each region differed, reflecting the known environmental gradients and particular objectives of the individual investigations. Occasionally problems occurred with the stereo-video methods in a sample, which meant that it was not possible to obtain length measurements of fish, resulting in the sample being discarded.
At the Houtman Abrolhos Islands, a location adjacent to a partial-take marine protected area at each of the three island groups was sampled (Pelsaert and Easter, Wallabi). These three locations were considered as a fixed factor as there is a known gradient in the fish communities between the island groups (Watson et al. 2007). Within each location three sites were randomly chosen and stereo DOV transects were conducted along the same reef slope as stereo BRUV deployments, ensuring similar habitats along the reef edge were sampled. Five replicate 100 m x 5 m stereo DOV transects and five replicate stereo BRUV deployments were analysed from each site. Due to problems with the stereo-systems one stereo BRUV replicate and 4 stereo DOV transects from two sites were missing from the data set. All surveys were conducted on the same coral reef slopes in 8-12 m water depth.
Notes
CreditLanglois, T.J., E.S. Harvey, B. Fitzpatrick, J. Meeuwig, G. Shedrawil, M. Westera and D.L. Watson
Created: 11 08 2009
text: westlimit=113.7; southlimit=-28.9; eastlimit=114.05; northlimit=-28.4
text: uplimit=12; downlimit=8
Subjects
ANIMALS/VERTEBRATES |
AQUATIC ECOSYSTEMS |
BIOLOGICAL CLASSIFICATION |
BIOSPHERE |
EARTH SCIENCE |
Fish |
Marine Habitat |
SPECTRAL/ENGINEERING |
Visible Imagery |
VISIBLE WAVELENGTHS |
biota |
oceans |
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Other Information
global : e9fb0599-a077-46e7-9a49-d41432cd2e85
Identifiers
- global : 15fc642c-0a63-4bf1-b83b-44d870824741
