Derelict fishing gear in Chesapeake Bay, Virginia: Spatial patterns and implications for marine fauna

Bilkovic, Donna Marie; Havens, Kirk J.; Stanhope, David; Angstadt, Kory

doi:10.1016/j.marpolbul.2014.01.034

Cited by 74 publications

(43 citation statements)

References 21 publications

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“…However, these inexpensive, lightweight (portable) sidescan sonar units can be deployed on almost any waterborne craft without the requirement of specialist knowledge of sonar and geodetics, and with little to no experience with acoustic remote sensing. This accessibility is behind the rapid increase in popularity of these sonar systems, among the scientific research community for benthic imaging in a range of aquatic environments, both marine and freshwater, lotic and lentic (Kaeser and Litts, 2008;Gonzalez-Socoloske et al, 2009;Collins et al, 2010;Kaeser and Litts, 2010;Havens et al, 2011;Goclowski et al, 2013;Kitchingman et al, 2013;Kaeser et al, 2013;Flowers and Hightower, 2013;Powers et al, 2014;Bilkovic et al, 2014;La Croix and Dashtgard, 2015;Sterrett et al, 2015;Froehlich and Kline, 2015;Buscombe et al, 2015;Cheek et al, 2016;Dunlop et al, 2016;Smit and Kaeser, 2016). Such spatially distributed benthic data are especially important in the development and evaluation of models for habitat suitability and vulnerability (e.g.…”

Section: The Democratization Of Sidescan Sonar Technologymentioning

confidence: 99%

Shallow water benthic imaging and substrate characterization using recreational-grade sidescan-sonar

Buscombe

2017

Environmental Modelling & Software

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In recent years, lightweight, inexpensive, vessel-mounted 'recreational grade' sonar systems have rapidly grown in popularity among aquatic scientists, for swath imaging of benthic substrates. To promote an ongoing 'democratization' of acoustical imaging of shallow water environments, methods to carry out geometric and radiometric correction and georectification of sonar echograms are presented, based on simplified models for sonar-target geometry and acoustic backscattering and attenuation in shallow water. Procedures are described for automated removal of the acoustic shadows, identification of bed-water interface for situations when the water is too turbid or turbulent for reliable depth echosounding, and for automated bed substrate classification based on singlebeam full-waveform analysis. These methods are encoded in an open-source and freely-available software package, which should further facilitate use of recreational-grade sidescan sonar, in a fully automated and objective manner. The sequential correction, mapping, and analysis steps are demonstrated using a data set from a shallow freshwater environment.

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Section: The Democratization Of Sidescan Sonar Technologymentioning

confidence: 99%

Shallow water benthic imaging and substrate characterization using recreational-grade sidescan-sonar

Buscombe

2017

Environmental Modelling & Software

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“…The latter include fishing activities, shipping, marine leisure industry, and offshore oil and hydrocarbon industries (Mouat et al 2010). In particular, derelict fishing gear 2 has become a serious concern with the intensified fishing effort in the world's oceans and the increasing durability of fishing gear (Macfadyen et al 2009;Bilkovic et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Regulation and Management of Marine Litter

Chen

2015

Marine Anthropogenic Litter

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This chapter aims to provide an overview of the regulation and management instruments developed at international, regional and national levels to address marine litter problems, put forward the potential gaps in the existing management body and suggest solutions. While not covering the gamut of all relevant instruments, a number of existing instruments, including specific management measures contained therein, were profiled as illustration. The management measures illustrated are either on a mandatory or voluntary basis and provide a general, snapshot picture of the management framework of marine litter. They can be broadly divided into four categories: preventive, mitigating, removing and behavior-changing. The preventive and behavior-changing measures are particularly important in addressing marine litter at its root. The former schemes include source reduction, waste reuse and recycling, containing debris at points of entry into receiving waters and land-based management initiatives (e.g. restriction of the use of plastic bags, establishment of extended producer responsibility). The latter schemes aid people's engagement in the other three types of measures, including education campaigns and activities raising awareness (e.g. Fishing for Litter). The potential gaps include limits of existing instruments in addressing plastic marine litter, deficiencies in the legislation and a lack of enforcement of regulations, poor cooperation among countries on marine litter issues and insufficient data on marine litter. To fill these gaps, recommendations are proposed, including establishment of a new international instrument targeted to the plastic marine litter problem, amending existing instruments to narrow exceptions and clarify enforcement standards, establishing national marine litter programe, enhancing participation and cooperation of states with regard to international/regional initiative, and devising measures to prevent marine litter from fishing vessels.

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“…Increasingly durable materials used in fishing equipment means that it can continue to ghost fish for some time; in this way it presents particular challenges as marine waste. Fisheries incur costs, firstly in having to replace the fishing gear they have lost at sea, and secondly in a reduction in their potential harvestable catch, and indeed the sustainability of that catch (Butler et al 2013;Arthur et al 2014;Bilkovic 2014). One study in Puget Sound, Washington, estimated that over 175,000 dungeness crab (Metacarcinus magister) were killed each year by derelict fishing traps, equivalent to around €586,000 or 4.5 % of the average annual harvest (Antonelis 2011).…”

Section: Fisheriesmentioning

confidence: 99%

The Economics of Marine Litter

Newman

Watkins

Farmer

et al. 2015

Marine Anthropogenic Litter

120

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This chapter aims to provide an overview of research into quantifying the economic impacts of marine litter. From an environmental economics perspective it introduces the difficulties in measuring the economic costs of marine litter; reviews those sectors where these costs are notable; and considers policy instruments, which can reduce these costs. Marine litter is underpinned by dynamic and complex processes, the drivers and impacts of which are multi-scalar, transboundary, and play out in both marine and terrestrial environments. These impacts include economic costs to expenditure, welfare and lost revenue. In most cases, these are not borne by the producers or the polluters. In industries such as fisheries and tourism the costs of marine litter are beginning to be quantified and are considerable. In other areas such as impacts on human health, or more intangible costs related to reduced ecosystem services, more research is evidently needed. As the costs of marine litter are most often used to cover removing debris or recovering from the damage which they have caused, this expenditure represents treatment rather than cure, and although probably cheaper than inaction do not present a strategy for cost reduction. Economic instruments, such as taxes and charges addressing the drivers of waste, for instance those being developed for plastic bags, could be used to reduce the production of marine litter and minimise its impacts. In any case, there remain big gaps in our understanding of the harm caused by marine litter, which presents difficulties when attempting to both quantify its economic costs, and develop effective and efficient instruments to reduce them.

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Derelict fishing gear in Chesapeake Bay, Virginia: Spatial patterns and implications for marine fauna

Cited by 74 publications

References 21 publications

Shallow water benthic imaging and substrate characterization using recreational-grade sidescan-sonar

Shallow water benthic imaging and substrate characterization using recreational-grade sidescan-sonar

Regulation and Management of Marine Litter

The Economics of Marine Litter

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