Macrofauna Techniques

Eleftheriou, A.; Moore, D.C.

doi:10.1002/9781118542392.ch5

Cited by 40 publications

(33 citation statements)

References 170 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: 77%

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: 77%

Detection of Stones in Marine Habitats Combining Simultaneous Hydroacoustic Surveys

Papenmeier

Hass

2018

Geosciences

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“…Bed samples have been gathered using a Hamon grab (Eleftheriou & Moore, 2013;Oele, 1978) on 24 and 27 November 2017 in the main and side channels, respectively. Figure 3 provides an overview of the location of longitudinal profiles (example shown: 16 February 2018) and lateral profiles (11 October 2018) along with the locations where bed samples were taken on 11 October 2018.…”

Section: Field Datamentioning

confidence: 99%

Diversion of Flow and Sediment Toward a Side Channel Separated From a River by a Longitudinal Training Dam

Ruijsscher

Vermeulen

Hoitink

2020

Water Resources Research

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A human-made entrance to a side channel separated from the river by a longitudinal training dam can be considered a new, emergent type of river bifurcation. To understand the processes controlling the diversion of flow and sediment toward the side channel at such bifurcations, a comprehensive field monitoring program was performed in the Waal River, which is the main branch of the Rhine River in the Netherlands. Local processes govern the flow field in the bifurcation region. The angle between the main river flow and the flow into the side channel increases with decreasing lateral and longitudinal distance to the bifurcation point, which corresponds to the head of the training dam. The general flow pattern can be well reproduced with a uniform depth, potential flow model consisting of a superposition of main channel flow and lateral outflow. For submerged flow conditions over the sill, the side channel hydraulic conditions influence the exchange processes, yet free flow side weir theory describes the flow field at this bifurcation type qualitatively well. The vertical flow structure in the side channel, which governs the sediment exchange between the main channel and the side channel, is steered by the geometrical details of the sill. The presence of the sill structure is key to controlling the morphological stability of this type of bifurcation given its primary influence on bed load sediment import and exerts an indirect impact on suspended sediment exchange.

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“…Area trawled was used to estimate abundance and biomass as catch per unit effort (CPUE), which were then normalized to 1,000 m -2 . Given the semi-quantitative nature of trawl surveys, these data should be considered gross estimates (Bluhm et al, 2009;Eleftheriou and Moore, 2013). Taxonomic names used for macro-and epifauna follow the currently accepted names in the World Register of Marine Species (http://www.marinespecies.org).…”

Section: Epifaunal Communitiesmentioning

confidence: 99%

Time-Series Benthic Community Composition and Biomass and Associated Environmental Characteristics in the Chukchi Sea During the RUSALCA 2004–2012 Program

Grebmeier¹,

Bluhm²,

Cooper³

et al. 2015

Oceanog

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Macrofauna Techniques

Cited by 40 publications

References 170 publications

Detection of Stones in Marine Habitats Combining Simultaneous Hydroacoustic Surveys

Detection of Stones in Marine Habitats Combining Simultaneous Hydroacoustic Surveys

Diversion of Flow and Sediment Toward a Side Channel Separated From a River by a Longitudinal Training Dam

Time-Series Benthic Community Composition and Biomass and Associated Environmental Characteristics in the Chukchi Sea During the RUSALCA 2004–2012 Program

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