Insights from baited video sampling of temperate reef fishes: How biased are angling surveys?
MetadataShow full item record
The need to address biodiversity information requirements has led to ‘methods research’ growing significantly in the field of ecology. Optimizing inference from survey data is dependent upon understanding the extent of sampling bias, which is inevitable when a subsample is taken to represent the entire population. In this study, angling is compared to Baited Remote Underwater Stereo–Video systems (stereo-BRUVs) as fisheries-independent sampling techniques for surveying temperate reef fishes in the Tsitsikamma Marine Protected Area, South Africa. The comparison highlighted a number of differences in the observed ichthyofauna, notably the ability of stereo-BRUVs to sample a wider range of species while also providing a more consistent index of relative abundance. Comparing relative abundance estimates indicated that both sampling methods were, in general, detecting similar environmentally-induced trends. Size distribution data from the two methods differed significantly amongst the predominant species, and angling produced consistently larger length–frequencies than stereo-BRUVs. However, when the hook-based size selectivity of angling was taken into account, there were no significant differences between the two methods. The ability to detect a species-specific population change over a period of five years was assessed using power analyses, and stereo-BRUVs consistently outperformed angling. The results identify stereo-BRUVs as the superior technique for monitoring the population and size-structure of temperate reef fishes.
Showing items related by title, author, creator and subject.
Comparison of the relative efficiencies of stereo-BRUVs and traps for samplingtropical continental shelf demersal fishesHarvey, Euan; Newman, S.; McLean, D.; Cappo, M.; Meeuwig, J.; Skepper, C. (2012)The sampling efficiencies of commercial standard fish traps and baited remote underwater stereo-video systems (stereo-BRUVs) were compared by examining the diversity and relative abundance of tropical demersal fish that ...
Cost-efficient sampling of fish assemblages: Comparison of baited video stations and diver video transectsLanglois, T.; Harvey, Euan; Fitzpatrick, B.; Meeuwig, J.; Shedrawi, G.; Watson, D. (2010)Baited remote underwater stereo-video (stereo-BRUV) stations and diver operatedstereo-video (stereo-DOV) transects are increasingly used to sample both tropical and temperate fish assemblages. Compared to in situ visual ...
Baited remote underwater stereo-video outperforms baited downward-facing single-video for assessments of fish diversity, abundance and size compositionCundy, M.; Santana Garcon, Julia; Ferguson, A.; Fairclough, D.; Jennings, P.; Harvey, Euan (2017)Â© 2017 Rapid changes in video technology have allowed for the development of sophisticated, efficient methods for surveying fish communities, including systems that use single or stereo video cameras, which are baited ...