Aerial surveys and distribution models enable monitoring of fishing in Marine Protected Areas

Zellmer, Amanda J.; Burdick, Heather; Medel, Ivan D.; Pondella, Daniel J.; Ford, Tom

doi:10.1016/j.ocecoaman.2018.08.027

Cited by 8 publications

(8 citation statements)

References 35 publications

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“…We were not able to directly test that hypothesis because we had at most only four years of site-specific survey data prior to 2003 at these sites, and our simulation analyses have shown that amount of data is inadequate to obtain an unbiased estimate of harvest rates. However, the pattern of higher fishing at those sites is consistent with an observed increase (via aerial monitoring) in the number of recreational fishing vessels on the north shore of Santa Cruz Island and the south shores of Anacapa Island in the 2003-2008 period (Cabral, Gaines, Johnson, Bell, & White, 2017;Zellmer et al, 2018a). The higher estimated fishing rates for kelp bass relative to the other three species are also consistent with kelp bass being the top species caught by recreational fishers in Southern California since the 1930s.…”

Section: Discussionsupporting

confidence: 76%

“…By contrast, we estimated remarkably high harvest rates-up to 10 times greater than previous regional-scale estimates-at several sites where fishing remains legal. To our knowledge, this is the first study to directly assess whether MPAs have eliminated harvest in a fished population, rather than determining whether fish abundance or biomass increased (which could still be possible even if some poaching was occurring) or using surveys of fisher abundance in or near MPAs (e.g., Zellmer, Burdick, Medel, Pondella, & Ford, 2018a). This is an important advance in MPA assessment, because a major concern in MPA design is that fish will tend to move across MPA boundaries and be captured, even if the center of their home range is inside an MPA (Moffitt, Botsford, Kaplan, & O'Farrell, 2009;Zeller & Russ, 1998).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of fish population size distributions confirms cessation of fishing in marine protected areas

White

Yamane

Nickols

et al. 2020

CONSERVATION LETTERS

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The number of protected areas that restrict or prohibit harvest of wild populations is growing. In general, protected areas are expected to increase the abundance of previously-harvested species. Whether a protected area achieves this expectation is typically evaluated by assessing trends in abundance after implementation. However, the underlying assumption that harvest has actually ceased is rarely tested directly. Determining whether illegal harvest (poaching) has continued in a protected area is important to planning enforcement and adaptive management. Here, we estimated harvest rates for four kelp forest fish species inside marine protected areas (MPAs) and non-MPA reference sites in the California Channel Islands, from 2003 (when MPAs were implemented) to 2017. We estimated harvest by fitting a size-structured population model to survey data. Overall, harvest rates were effectively zero in MPAs but much higher in non-MPA sites. This indicates successful adherence to MPA regulations, and possible displacement of fishing effort to reference sites. However, some poaching was detected in two MPA sites, highlighting the importance of assessing this quantity. This modeling approach could provide a tool to complement the long-term management of MPA networks, particularly given the difficulty of acquiring harvest rate data at the spatial scale of individual MPAs.

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Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Analysis of fish population size distributions confirms cessation of fishing in marine protected areas

White

Yamane

Nickols

et al. 2020

CONSERVATION LETTERS

View full text Add to dashboard Cite

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“…The second requirement corresponds to the prompt updating capacity for a large-scale area, which mainly depends on the swath width of the satellite. This aspect can facilitate the rapid monitoring of construction areas [7], daily distribution survey of marine vessels [8], and agricultural surveys, among other applications, in which large-scale time series satellite images must be acquired in a small period.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Optical Satellite Sensor and Positioning Accuracy Assessment for The Hongqi-H9 Wide-Range Satellite in Different Terrains

Song

Wang²,

Yang³

et al. 2020

Preprint

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The Hongqi-H9 wide-range satellite, which was launched on January 15, 2020, has a resolution of less than 1 m and a swath width of 136 km. This satellite is the largest sub-meter level satellite worldwide and the first ton-level commercial remote sensing satellite in China. In particular, this satellite can acquire sub-meter image data for an area of approximately 1,000 km2 per second and full-coverage image information for an area of more than 1,000,000 km2. This study was aimed at assessing the geometric positioning accuracy of the Hongqi-H9 satellite considering three aspects, namely, the circle error accuracy, rational polynomial coefficient based direct geometric positioning accuracy and ground control point based absolute positioning accuracy under urban, plain, and mountainous areas, with different topographies. The results of the conducted experimental investigation indicated that the Hongqi-H9 satellite could exhibit a high positioning accuracy in planar and vertical directions for different terrains. In particular, for areas with a low topography and few surface structures, the geometric positioning accuracy of the Hongqi-H9 satellite imagery was less than 4 and 2 m in the planimetry and elevation directions, respectively. These characteristics can promote the application of the Hongqi-H9 satellite images in agricultural surveys, target detection, and land surveys, among other domains.

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“…Static MPA boundaries were chosen in the siting process in California to facilitate public awareness and compliance evaluation [24]. Since implementation of the MLPA, there has been a decrease in vessel presence within MPAs in some regions, but the magnitude of change varies by vessel type, suggesting a mixed response across different fisheries [25].…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies in California and elsewhere have used different strategies to estimate fishing effort including interviews [5,16,[26][27][28][29], logbooks [16,17,27,30], shore-or aerial-based observation [16,25,[31][32][33], and population modeling [21]. Participatory vessel tracking systems that require vessel cooperation, like the Automatic Identification System (AIS) and vessel monitoring systems (VMS), help document large-scale commercial fishing activity, but these technologies are not required or used by most state-managed small-scale fisheries in nearshore waters [34] including those in California [35].…”

Section: Introductionmentioning

confidence: 99%

Coastal radar as a tool for continuous and fine-scale monitoring of vessel activities of interest in the vicinity of marine protected areas

Cope¹,

Tougher²,

Morten

et al. 2022

PLoS ONE

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Marine protected areas (MPAs) are widely utilized for conservation of the world’s marine resources. Yet, compliance with MPA regulations remains difficult to measure because of limits to human resources and a lack of affordable technologies to automate monitoring over time. The Marine Monitor, an autonomous vessel monitoring, recording, and reporting system leveraging commercial off-the-shelf X-band marine radar to detect and track vessels, was used to monitor five nearshore California MPAs simultaneously and continuously to identify and compare site-specific use patterns over one year. Vessel tracks were classified into two movement patterns to capture likely fishing activity, “focal” or “linear”, that corresponded with local targeted species. Some illegal fishing potentially occurred at all sites (7–17% of tracks depending on site) most frequently on weekends and at mid-day, but the majority of activity occurred just outside the MPAs and in the near vicinity suggesting both a high level of compliance with regulations and awareness of MPA boundaries. Time spent engaged in potential fishing activity compared to track counts suggests that unique vessels may spend more time fishing inside area boundaries at some sites than others. The spatial distribution of activity shows distinct concentrations near MPA boundaries at all sites which strongly suggests vessels purposefully target the narrow area at the MPA boundary or “fish the line”, a potential acknowledgement of successful spillover. This activity increased significantly during some local fishing seasons. Concentration of activity at MPA boundaries highlights the importance of continuous monitoring at a high spatial and temporal resolution. Reporting of vessel behavior at a fine-scale using radar can help resource managers target enforcement efforts and understand human use patterns near coastal MPAs.

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Aerial surveys and distribution models enable monitoring of fishing in Marine Protected Areas

Cited by 8 publications

References 35 publications

Analysis of fish population size distributions confirms cessation of fishing in marine protected areas

Analysis of fish population size distributions confirms cessation of fishing in marine protected areas

WITHDRAWN: Optical Satellite Sensor and Positioning Accuracy Assessment for The Hongqi-H9 Wide-Range Satellite in Different Terrains

Coastal radar as a tool for continuous and fine-scale monitoring of vessel activities of interest in the vicinity of marine protected areas

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