Integrating time-series hydroacoustics and video observations for detecting changes in benthic habitats

Rattray, Alex, Ierodiaconou, Daniel, Monk, Jacquomo, Laurenson, Laurie and Quinn, Gerry 2011, Integrating time-series hydroacoustics and video observations for detecting changes in benthic habitats, in GeoHab 2011 : Conference Abstract volume, [Marine Geological and Biological Habitat Mapping], [Helsinki, Finland], pp. 75-75.

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Title Integrating time-series hydroacoustics and video observations for detecting changes in benthic habitats
Author(s) Rattray, Alex
Ierodiaconou, Daniel
Monk, Jacquomo
Laurenson, Laurie
Quinn, Gerry
Conference name Marine Geological and Biological Habitat Mapping. Conference (2011 : Helsinki, Finland)
Conference location Helsinki, Finland
Conference dates 3-6 May 2011
Title of proceedings GeoHab 2011 : Conference Abstract volume
Editor(s) Kotilainen, Aarno
Kaskela, Anu
Publication date 2011
Conference series Marine Geological and Biological Habitat Mapping. Conference
Start page 75
End page 75
Publisher [Marine Geological and Biological Habitat Mapping]
Place of publication [Helsinki, Finland]
Keyword(s) marine benthic habitats
marine habitat mapping activities
habitat change
Summary The ability to quantify change in marine benthic habitats must be considered a key goal of marine habitat mapping activities. Changes in distribution of distinct suites of benthic biological species may occur as a result of natural or human induced processes and these processes may operate at a range of temporal and spatial scales. It is important to understand natural small scale inter-annual patterns of change in order to separate these signals from potential patterns of longer term change. Work to describe these processes of change from an acoustic remote sensing stand point has thus far been limited due to the relatively recent availability of full coverage swath acoustic datasets and cost pressures associated with multiple surveys of the same area. This paper describes the use of landscape transition analysis as a means to differentiate seemingly random patterns of habitat change from systematic signals of habitat transition at a shallow (10–50 m depth) 18 km2 study area on the temperate Australian continental shelf between the years 2006 and 2007. Supervised classifications for each year were accomplished using independently collected high resolution (3 m cell-size) multibeam echosounder (MBES) and video-derived reference data. Of the 4 representative biotic classes considered, signals of directional systematic changes were observed to occur between a shallow kelp dominated class, a deep sessile invertebrate dominated class and a mixed class of kelp and sessile invertebrates. These signals of change are interpreted as inter-annual variation in the density and depth related extent of canopy forming kelp species at the site, a phenomenon reported in smaller scale temporal studies of the same species. The methods applied in this study provide a detailed analysis of the various components of the traditional change detection cross tabulation matrix allowing identification of the strongest signals of systematic habitat transitions across broad geographical regions. Identifying clear patterns of habitat change is an important first step in linking these patterns to the processes that drive them.
ISSN 0367-5211
Language eng
Field of Research 069999 Biological Sciences not elsewhere classified
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category E3 Extract of paper
Persistent URL http://hdl.handle.net/10536/DRO/DU:30042305

Document type: Conference Paper
Collection: School of Life and Environmental Sciences
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