Space use patterns of sharks in relation to boat activity in an urbanized coastal waterway

Rider, Mitchell J.; Kirsebom, O. S.; Gallagher, Austin J.; Staaterman, Erica; Ault, Jerald S.; Sasso, Christopher R.; Jackson, Tom; Browder, Joan A.; Hammerschlag, Neil

doi:10.1016/j.marenvres.2021.105489

Cited by 9 publications

(5 citation statements)

References 42 publications

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“…Nevertheless, we found that juvenile smooth hammerheads tagged at or near the eastern boundary of the De Hoop MPA were spending significantly more time outside the eastern boundary, leaving them vulnerable to fishing pressure here. It is also interesting to note that residency indices for tagged sharks in this study are comparable to other hammerhead species (Guttridge et al, 2017;Rider et al, 2021) in studies that investigated coastal movement patterns.…”

Section: Discussionsupporting

confidence: 70%

“…To account for variation in tagging dates and receiver deployment time, a residency index (RI) was calculated for each individual at each receiver as the number of days an individual shark was detected at a receiver divided by the total number of days it could have been detected at that station (Rider et al, 2021) according to the following formula:…”

Section: Discussionmentioning

confidence: 99%

“…Receivers were deployed using ATAP's standardized railway anchor moorings (Cowley et al, 2017), and were recovered by divers for maintenance and data download four times throughout the study period (January 2019 -May 2020). The nine receivers deployed specifically for this study were tested to determine their effective detection range following the methods of Kessel et al (2014) and Rider et al (2021). Specifically, two V16 continuous pinging sentinel tags (Innovasea) were deployed at distance intervals of 350 m and 650 m from receivers.…”

Section: Acoustic Telemetrymentioning

confidence: 99%

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Acoustic tracking of a threatened juvenile shark species, the smooth hammerhead (Sphyrna zygaena), reveals vulnerability to exploitation at the boundary of a marine reserve

Albano

Fallows²,

Fallows³

et al. 2023

Front. Mar. Sci.

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The coastal waters of South Africa are habitat to a diverse composition of sharks that are vulnerable to exploitation, many of which are endemic and/or classified by the International Union for Conservation of Nature (IUCN) Red List as Threatened or Data Deficient. Accordingly, this region has been identified as a global research and conservation priority for elasmobranchs. The De Hoop Marine Protected Area (MPA), in the Western Cape Province of South Africa, provides 288 km2 of no-take protection within its boundaries. However, the region experiences heavy commercial fishing, with two vessels actively operating as dedicated shark longliners (as of 2022). When crossing MPA boundaries, sharks are susceptible to capture by these vessels. Utilizing passive acoustic telemetry, the present study evaluated the movements of a threatened juvenile shark species, the smooth hammerhead (Sphyrna zygaena), both inside and adjacent to the De Hoop MPA, and along the greater coastline. Movement data from 20 tagged sharks were used to explore the effects of spatial, environmental, and management variables on their residency and movement patterns. Results indicate a high reliance of sharks on unprotected waters immediately adjacent to the MPA’s eastern boundary, an area of high biological productivity due to its proximity to the mouth of an estuary. Although some tagged sharks did move regionally along the South African coastline, individuals spent 95% of their days detected just outside the eastern boundary of the MPA, rendering them vulnerable to commercial shark longlining occurring there. These findings have conservation implications for smooth hammerhead sharks in South Africa and present an opportunity to revisit management practices that may optimize spatial protection for an important life stage of this threatened species.

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Section: Discussionsupporting

confidence: 70%

Section: Discussionmentioning

confidence: 99%

Section: Acoustic Telemetrymentioning

confidence: 99%

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Acoustic tracking of a threatened juvenile shark species, the smooth hammerhead (Sphyrna zygaena), reveals vulnerability to exploitation at the boundary of a marine reserve

Albano

Fallows²,

Fallows³

et al. 2023

Front. Mar. Sci.

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“…Accounting for such behavioural responses to anthropogenic sound in the field is challenging, particularly over the spatial scales presented here, and may require tagging of animals 76 , which often requires a permit, or expensive equipment, such as sonar 77 . However, such applications to monitor behavioural responses to boat sound are fairly unexplored 12 .…”

Section: Discussionmentioning

confidence: 99%

Impact of small boat sound on the listening space of Pempheris adspersa, Forsterygion lapillum, Alpheus richardsoni and Ovalipes catharus

Wilson¹,

Constantine

Pine

et al. 2023

Sci Rep

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Anthropogenic stressors, such as plastics and fishing, are putting coastal habitats under immense pressure. However, sound pollution from small boats has received little attention given the importance of sound in the various life history strategies of many marine animals. By combining passive acoustic monitoring, propagation modelling, and hearing threshold data, the impact of small-boat sound on the listening spaces of four coastal species was determined. Listening space reductions (LSR) were greater for fishes compared to crustaceans, for which LSR varied by day and night, due to their greater hearing abilities. Listening space also varied by sound modality for the two fish species, highlighting the importance of considering both sound pressure and particle motion. The theoretical results demonstrate that boat sound hinders the ability of fishes to perceive acoustic cues, advocating for future field-based research on acoustic cues, and highlighting the need for effective mitigation and management of small-boat sound within coastal areas worldwide.

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“…Measuring the effects of these disturbances on aquatic animal behavior has been impaired by the lack of appropriate tools (Barcelo-Serra et al, 2021). However, recent AT studies managed to reveal significant impacts of seismic surveys (Figure 2), shipping, and wind farm noise on fish behavioral patterns (Davidsen et al, 2019;Ivanova et al, 2020;Rider et al, 2021;Wardle et al, 2001;Winter et al, 2010) and potential effects on population survival and fisheries productivity (Bruce et al, 2018;Hubert et al, 2020;van der Knaap et al, 2021van der Knaap et al, , 2022. The benefits of AT to measure the effects of light pollution is extended to other no-fish taxa.…”

Section: S Dg14 Targ E T 1-acous Ti C Tr Ack Ing To Me a Sure The Eff...mentioning

confidence: 99%

Toward a decade of ocean science for sustainable development through acoustic animal tracking

Alós

Aarestrup

Abecasis

et al. 2022

Global Change Biology

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Space use patterns of sharks in relation to boat activity in an urbanized coastal waterway

Cited by 9 publications

References 42 publications

Acoustic tracking of a threatened juvenile shark species, the smooth hammerhead (Sphyrna zygaena), reveals vulnerability to exploitation at the boundary of a marine reserve

Acoustic tracking of a threatened juvenile shark species, the smooth hammerhead (Sphyrna zygaena), reveals vulnerability to exploitation at the boundary of a marine reserve

Impact of small boat sound on the listening space of Pempheris adspersa, Forsterygion lapillum, Alpheus richardsoni and Ovalipes catharus

Toward a decade of ocean science for sustainable development through acoustic animal tracking

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