Integrating multibeam sonar and underwater video data to map benthic habitats in an East Antarctic nearshore environment

Smith, J. A.; O'Brien, P. E.; Stark, Jonathan S.; Johnstone, Glenn; Riddle, Martin J.

doi:10.1016/j.ecss.2015.07.036

Cited by 27 publications

(26 citation statements)

References 43 publications

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“…The development of remote sensing methods, such as acoustics, satellites, radar techniques or even the use of photography using drones, are promising for approaches for assessing extent and distribution of benthic habitats in the marine environment [ 35 , 38 , 94 – 97 ]. These methods, however, need to be complemented with detailed data collected in situ which can be used to parameterise, calibrate and validate empirical models based on remote sensing data [ 37 , 40 , 59 , 63 ]. Observations using towed video, allowing species identification and estimation of local abundance and cover, appear to be very useful here.…”

Section: Discussionmentioning

confidence: 99%

“…[ 35 , 36 ]). To verify biological predictions and ground-truth seabed characterization made by acoustic methods, various image and video based methods have frequently been used [ 37 – 40 ]. Such underwater imagery methods are non-destructive, which makes them especially useful in biological sampling in sensitive benthic environments.…”

Section: Introductionmentioning

confidence: 99%

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Developing methods for assessing abundance and distribution of European oysters (Ostrea edulis) using towed video

et al. 2017

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Due to large-scale habitat losses and increasing pressures, benthic habitats in general, and perhaps oyster beds in particular, are commonly in decline and severely threatened on regional and global scales. Appropriate and cost-efficient methods for mapping and monitoring of the distribution, abundance and quality of remaining oyster populations are fundamental for sustainable management and conservation of these habitats and their associated values. Towed video has emerged as a promising method for surveying benthic communities in a both non-destructive and cost-efficient way. Here we examine its use as a tool for quantification and monitoring of oyster populations by (i) analysing how well abundances can be estimated and how living Ostrea edulis individuals can be distinguished from dead ones, (ii) estimating the variability within and among observers as well as the spatial variability at a number of scales, and finally (iii) evaluating the precision of estimated abundances under different scenarios for monitoring. Overall, the results show that the can be used to quantify abundance and occurrence of Ostrea edulis in heterogeneous environments. There was a strong correlation between abundances determined in the field and abundances estimated by video-analyses (r2 = 0.93), even though video analyses underestimated the total abundance of living oysters by 20%. Additionally, the method was largely repeatable within and among observers and revealed no evident bias in identification of living and dead oysters. We also concluded that the spatial variability was an order of magnitude larger than that due to observer errors. Subsequent modelling of precision showed that the total area sampled was the main determinant of precision and provided general method for determining precision. This study provides a thorough validation of the application of towed video on quantitative estimations of live oysters. The results suggest that the method can indeed be very useful for this purpose and we therefor recommend it for future monitoring of oysters and other threatened habitats and species.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Developing methods for assessing abundance and distribution of European oysters (Ostrea edulis) using towed video

et al. 2017

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“…This approach is especially relevant and timely, as the use of non-invasive imaging technology in marine research has increased over the last decades (Mallet and Pelletier 2014) and technologies as well as methodologies continue to develop rapidly (Durden et al 2016;Schoening et al 2017). In the Antarctic, in particular, they are already widely applied in benthic studies in the Weddell Sea (e.g., Fillinger et al 2013;Segelken-Voigt et al 2016;Ambroso et al 2017), the East Antarctic shelf (e.g., Smith et al 2015;Post et al 2017), the Ross Sea (e.g., Clark and Bowden 2015), the West Antarctic (e.g., Eastman et al 2013) and in large-scale comparative studies (e.g., Santagata et al 2018).…”

Section: Relevance and Applicability Of The Described Characteristicsmentioning

confidence: 99%

Macroscopic characteristics facilitate identification of common Antarctic glass sponges (Porifera, Hexactinellida, Rossellidae)

2020

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Glass sponges (Porifera, Hexactinellida) are conspicuous habitat-forming members of many Antarctic shelf communities. Despite their ecological importance, in-situ species identification remains problematic as it is traditionally based on microscopic analysis of spicules. External morphological features, in contrast, have largely been disregarded, so that different species have been mislabeled or lumped together when their identification was based on image material. In this paper, we provide a straight-forward guideline for in-situ identification of the most common rossellid sponges of the Antarctic shelf based on macroscopic characteristics. To determine diagnostic macroscopic characteristics of Anoxycalyx (Scolymastra) joubini and eight Rossella species, we combined examination of trawl-collected specimens, previous species descriptions and in-situ image material from the eastern Weddell Sea. Our study revealed that the smooth-walled species A. joubini, R. nuda and R. vanhoeffeni, previously often mixed up, can be distinguished by the form of their basal spicule tuft, their surface structure and their overall body form. The previously synonymized species R. racovitzae and R. podagrosa can be distinguished by their markedly different habitus. Based on our results, the so-called 'R. racovitzae budding type' in fact refers to R. podagrosa which occurs regularly in the eastern Weddell Sea. The species R. villosa, R. levis, R. fibulata and R. antarctica can be distinguished by the appearance of their conules, protruding spicules and overall body form. We conclude that macroscopic characteristics are helpful means for identification of Antarctic rossellid sponge species. This approach enables species-specific quantitative studies of Antarctic glass sponge grounds based on increasingly used non-invasive imaging technology.

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“…1). Full details of the collection and characterization of underwater video including the biota is published in Smith et al (2015). The sea bed was characterized using the scheme of Anderson et al (2008) to record substrate composition (rock, boulder, cobble, pebble, sand, mud), bedforms (ripples, hummocks, iceberg scour features) and relief (smooth < 1 m, moderate 1-3 m, high > 3 m).…”

Section: Underwater Videomentioning

confidence: 99%

Submarine geomorphology and sea floor processes along the coast of Vestfold Hills, East Antarctica, from multibeam bathymetry and video data

O’Brien¹,

Smith

Stark

et al. 2015

Antartic science

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A survey of nearshore areas in the Vestfold Hills, Antarctica, using high-resolution multibeam swath bathymetry provided both a detailed digital bathymetric model and information on sediment acoustic backscatter. Combined with underwater video transects and sediment sampling, these data were used to identify and map geomorphic units. Six geomorphic units identified in the survey region include: rocky outcrops, basins, pediments, valleys, scarps and embayments. In addition to geomorphic units, the data revealed sedimentary features that provide insights into post-glacial sediment transport and erosion in the area. Ice keel pits and scours are common, and sea floor channels, scour depressions and sand ribbons indicate transport and deposition by wind-driven currents and oceanographic circulation. Gullies and sediment lobes observed on steep slopes indicate mass movement of sediment. Some of these processes have not been directly observed to date, but their effectiveness in shaping the modern sea floor is clearly indicated by the sea floor mapping data. The embayments preserve a mantle of boulder sand probably deposited by cold-based glaciers which were flanked by faster-flowing ice in adjoining regions.

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Integrating multibeam sonar and underwater video data to map benthic habitats in an East Antarctic nearshore environment

Cited by 27 publications

References 43 publications

Developing methods for assessing abundance and distribution of European oysters (Ostrea edulis) using towed video

Developing methods for assessing abundance and distribution of European oysters (Ostrea edulis) using towed video

Macroscopic characteristics facilitate identification of common Antarctic glass sponges (Porifera, Hexactinellida, Rossellidae)

Submarine geomorphology and sea floor processes along the coast of Vestfold Hills, East Antarctica, from multibeam bathymetry and video data

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