Cost-efficient sampling of fish assemblages: Comparison of baited video stations and diver video transects
MetadataShow full item record
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 census methods, the use of stereo-video reduces interobserver variability, improves definition of the sample unit area, increases accuracy of fish length estimates and provides a permanent record of the assemblage that can be validated where required or independently reanalysed. Previous studies have suggested that stereo-BRUV collects representative data on both carnivorous and herbivorous species and can be more cost-efficient than diverbased survey methods. This study compares estimates of common fish assemblage metrics obtained with stereo-BRUV stations and stereo-DOV transects across 3 biogeographic regions, and uses a costoptimization procedure to compare the efficiency of these 2 methods. Stereo-BRUV stations were found to sample greater species richness and obtain greater estimates of relative biomass of generalist carnivores, but no differences occurred in the biomass of herbivores sampled by the 2 techniques. Stereo-BRUV stations generally obtained estimates of assemblage metrics with less variance, resulting in greater power to detect spatial and temporal changes in the fish assemblage metrics. Cost–benefit analyses found that stereo-BRUV was generally more time efficient than stereo-DOV transects in terms of smaller standard error around the mean of the various metrics considered. However, across the 3 biogeographic regions sampled there was considerable variation in the magnitude of these differences. Results suggest that stereo-BRUV stations are, in general, a more cost-effectivemethod for monitoring fish assemblages than stereo-DOV transects.
Showing items related by title, author, creator and subject.
Diver operated video most accurately detects the impacts of fishing within periodically harvested closuresGoetze, J.; Jupiter, S.; Langlois, T.; Wilson, S.; Harvey, Euan; Bond, T.; Naisilisili, W. (2015)Periodically harvested closures (PHCs) have become the most common form of spatial management in Melanesia. Despite their popularity, their effectiveness to sustain local fish stocks remains largely unknown. Here we test ...
Combining underwater video methods improves effectiveness of demersal fish assemblage surveys across habitatsLogan, J.; Young, M.; Harvey, Euan; Schimel, A.; Ierodiaconou, D. (2017)© Inter-Research 2017. Knowledge of the biases and advantages of various methods can inform and create more efficient sampling of either whole fish assemblages or targeted species. Comparisons of stereo baited remote ...
McIlwain, Jennifer; Harvey, Euan; Grove, S.; Shiell, G.; Al Oufi, H.; Al Jardani, N. (2011)The coastal shelf of the Gulf of Oman experiences periodic upwelling events during the summer months that are driven by the southwest monsoon. It is unclear what role these events play in the spatial and temporal distribution ...