Benefits and shortcomings of non-destructive benthic imagery for monitoring hard-bottom habitats

Beisiegel, Kolja; Darr, Alexander; Gogina, Mayya; Zettler, Michael L.

doi:10.1016/j.marpolbul.2017.04.009

Cited by 42 publications

(36 citation statements)

References 53 publications

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“…Even studies using a large dataset of sediment sample information often underestimate size classes of gravel and stones [36]. Moreover, earlier studies reported that grab samplers deployed in stony areas mainly catch finer sediment in between stones and are therefore not representative [37][38][39][40]. This has been confirmed during surveys for this study.…”

Section: Discussionsupporting

confidence: 68%

Detection of Stones in Marine Habitats Combining Simultaneous Hydroacoustic Surveys

Papenmeier

Hass

2018

Geosciences

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Exposed stones in sandy sublittoral environments are hotspots for marine biodiversity, especially for benthic communities. The detection of single stones is principally possible using sidescan-sonar (SSS) backscatter data. The data resolution has to be high to visualize the acoustic shadows of the stones. Otherwise, stony substrates will not be differentiable from other high backscatter substrates (e.g., gravel). Acquiring adequate sonar data and identifying stones in backscatter images is time consuming because it usually requires visual-manual procedures. To develop a more efficient identification and demarcation procedure of stone fields, sidescan sonar and parametric echo sound data were recorded within the marine protected area of "Sylt Outer Reef" (German Bight, North Sea). The investigated area (~5.900 km 2 ) is characterized by dispersed heterogeneous moraine and marine deposits. Data from parametric sediment echo sounder indicate hyperbolas at the sediment surface in stony areas, which can easily be exported. By combining simultaneous recorded low backscatter data and parametric single beam data, stony grounds were demarcated faster, less complex and reproducible from gravelly substrates indicating similar high backscatter in the SSS data.

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Section: Discussionsupporting

confidence: 68%

Detection of Stones in Marine Habitats Combining Simultaneous Hydroacoustic Surveys

Papenmeier

Hass

2018

Geosciences

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“…Both in Baltic Sea and North Sea exposed stones are generally settled by sessile organisms [8,34,36,55]. For the North Sea Michaelis et al [34] have shown that the proportion of colonized hard substrate is increasing with object size.…”

Section: Hard Substrate Originmentioning

confidence: 99%

Hydroacoustic Mapping of Geogenic Hard Substrates: Challenges and Review of German Approaches

et al. 2020

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Subtidal hard substrate habitats are unique habitats in the marine environment. They provide crucial ecosystem services that are socially relevant, such as water clearance or as nursery space for fishes. With increasing marine usage and changing environmental conditions, pressure on reefs is increasing. All relevant directives and conventions around Europe include sublittoral hard substrate habitats in any manner. However, detailed specifications and specific advices about acquisition or delineation of these habitats are internationally rare although the demand for single object detection for e.g., ensuring safe navigation or to understand ecosystem functioning is increasing. To figure out the needs for area wide hard substrate mapping supported by automatic detection routines this paper reviews existing delineation rules and definitions relevant for hard substrate mapping. We focus on progress reached in German approval process resulting in first hydroacoustic mapping advices. In detail, we summarize present knowledge of hard substrate occurrence in the German North Sea and Baltic Sea, describes the development of hard substrate investigations and state of the art mapping techniques as well as automated analysis routines.

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“…The discovery of a small hard‐substratum ‘island’ surrounded by a sea of mud (see Meyer et al, ) highlights the importance of ongoing acoustic surveys that produce high‐resolution data over extensive areas, to help identify small benthic habitats that might be of high conservation importance. Towed camera imagery proved an appropriate, non‐destructive tool for the estimation of reef substratum structure and sessile species cover (Beisiegel et al, ), as well as for detection of fish species in situ in a highly complex terrain (Somerton, Williams, & Campbell, ). Furthermore, the study also highlights that, even 26 years after the introduction of the Habitats Directive, many sublittoral reef habitats in European waters remain undiscovered and unprotected.…”

Section: Discussionmentioning

confidence: 99%

“…In total, 231 seabed images (24 Mpx) were collected with a downward‐facing photographic camera, and 1 h 23 min of video was recorded with an oblique forward‐looking video camera (1920 px × 1080 px). Both cameras were installed on a carrier platform, the Baltic Seafloor Imaging System (BaSIS; see Beisiegel, Darr, Gogina, & Zettler, ; Beisiegel et al, ) and towed by the vessel at a speed of 0.5 kn and a target altitude of 1 m above the sea bed. Photographs were taken every 20 s, with an average sampled area of 0.8 m 2 .…”

Section: Methodsmentioning

confidence: 99%

“…The entire field of view was used for the analysis, and species were assigned. However, by deriving biological data from image‐based sampling, it must always be considered that small organisms (typically individuals smaller than 1 cm) as well as cryptic species living in interstitial spaces, camouflaged or actively avoiding the camera platform, cannot be detected (Beisiegel et al, ; Howell et al, ; Williams et al, ).…”

Section: Methodsmentioning

confidence: 99%

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The potential exceptional role of a small Baltic boulder reef as a solitary habitat in a sea of mud

Beisiegel

Tauber

Gogina

et al. 2019

Aquatic Conservation

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1. In this study, non-destructive seafloor imaging techniques were employed to assess the benthic community structure of a recently discovered boulder reef within the central Arkona Basin of the Baltic Sea.2. Data indicate that geographical isolation, water column stratification and temporary oxygen deficiency create an exceptional reef habitat in a sea of mud. 3. The reef forms a saline refuge for the deepest and easternmost known population of the plumose sea anemones (Metridium dianthus Ellis, 1768) in the Baltic Sea. 4. Limited connectivity to other reefs and dominance of the aggressively colonizing and planktivorous M. dianthus hamper the recruitment of other species and lead to an overall low invertebrate richness. 5. Large boulders attract ecologically and economically important fish like Baltic cod (Gadus morhua Linnaeus, 1758) that find shelter in the otherwise heavily fished Arkona Basin.6. Despite this very first exploration being only a snapshot of the observed community, findings imply a potential conservation importance of this Germany's deepest known natural habitat type 1170 ('reefs').

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Benefits and shortcomings of non-destructive benthic imagery for monitoring hard-bottom habitats

Cited by 42 publications

References 53 publications

Detection of Stones in Marine Habitats Combining Simultaneous Hydroacoustic Surveys

Detection of Stones in Marine Habitats Combining Simultaneous Hydroacoustic Surveys

Hydroacoustic Mapping of Geogenic Hard Substrates: Challenges and Review of German Approaches

The potential exceptional role of a small Baltic boulder reef as a solitary habitat in a sea of mud

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