13 results on '"Brendan D. Shea"'
Search Results
2. Humpback Whale Instigates Object Play with a Lion’s Mane Jellyfish
- Author
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Brendan D. Shea and Austin J. Gallagher
- Subjects
humpback whale ,innovation ,lion’s mane jellyfish ,object use ,cetacean ,Oceanography ,GC1-1581 - Abstract
Cetaceans are well-known for their intelligence, charismatic nature, and curiosity. Many species, particularly odontocetes, are known to investigate and manipulate novel objects they encounter. Yet, disentangling the drivers of these behaviors and distinguishing between those that are simply playful and those which serve a specific function remains challenging due to a lack of direct observations and detailed descriptions of behaviors. This is particularly true for mysticetes such as humpback whales (Megaptera novaeangliae), as records of object use are far less common than in odontocetes. Here, we present evidence of novel object use from a first of its kind encounter between an individual humpback whale and a large lion’s mane jellyfish (Cyanea capillata) in the coastal waters off New England. We detail the interaction and discuss possible drivers for the behavior, with a focus on cetacean innovation, ectoparasite removal, and wound healing.
- Published
- 2021
- Full Text
- View/download PDF
3. First Application of 360-Degree Camera Technology to Marine Predator Bio-Logging
- Author
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Austin J. Gallagher, Nourah A. Alsudairy, Brendan D. Shea, Nicholas L. Payne, and Carlos M. Duarte
- Subjects
bio-logging ,camera ,360 ,shark ,telemetry ,monitoring ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
Animal-borne video camera systems have long-been used to capture the fine-scale behaviors and unknown aspects of the biology of marine animals. However, their utility to serve as robust scientific tools in the greater bio-logging research community has not been fully realized. Here we provide, for the first time, an application of 360-degree camera technology to a marine organism, using a large tiger shark as a proof-of-concept case study. Leveraging the three-dimensional nature of the imaging technology, we derived 224 seafloor habitat assessments over the course of the nearly 1-h track, whereby the shark was able to survey ∼23,000 square meters of seafloor; over three-times greater than the capacity of non 360-degree cameras. The resulting data provided detailed information on habitat use, diving behavior, and swimming speed, as well seafloor mapping. Our results suggest that 360-degree cameras provide complimentary benefits—and in some cases superior efficiency—than unidirectional video packages, with an enhanced capacity to map seafloor.
- Published
- 2021
- Full Text
- View/download PDF
4. Spatial Connectivity and Drivers of Shark Habitat Use Within a Large Marine Protected Area in the Caribbean, The Bahamas Shark Sanctuary
- Author
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Austin J. Gallagher, Oliver N. Shipley, Maurits P. M. van Zinnicq Bergmann, Jacob W. Brownscombe, Craig P. Dahlgren, Michael G. Frisk, Lucas P. Griffin, Neil Hammerschlag, Sami Kattan, Yannis P. Papastamatiou, Brendan D. Shea, Steven T. Kessel, and Carlos M. Duarte
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shark ,acoustic telemetry ,marine protected area ,MPA ,seagrass ,coral reef ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
Marine protected areas (MPAs) have emerged as potentially important conservation tools for the conservation of biodiversity and mitigation of climate impacts. Among MPAs, a large percentage has been created with the implicit goal of protecting shark populations, including 17 shark sanctuaries which fully protect sharks throughout their jurisdiction. The Commonwealth of the Bahamas represents a long-term MPA for sharks, following the banning of commercial longlining in 1993 and subsequent designation as a shark sanctuary in 2011. Little is known, however, about the long-term behavior and space use of sharks within this protected area, particularly among reef-associated sharks for which the sanctuary presumably offers the most benefit. We used acoustic telemetry to advance our understanding of the ecology of such sharks, namely Caribbean reef sharks (Carcharhinus perezi) and tiger sharks (Galeocerdo cuvier), over two discrete islands (New Providence and Great Exuma) varying in human activity level, over 2 years. We evaluated which factors influenced the likelihood of detection of individuals, analyzed patterns of movement and occurrence, and identified variability in habitat selection among species and regions, using a dataset of 23 Caribbean reef sharks and 15 tiger sharks which were passively monitored in two arrays with a combined total of 13 acoustic receivers. Caribbean reef sharks had lower detection probabilities than tiger sharks, and exhibited relatively low habitat connectivity and high residency, while tiger sharks demonstrated wider roaming behavior across much greater space. Tiger sharks were associated with shallow seagrass habitats where available, but frequently transited between and connected different habitat types. Our data support the notion that large MPAs afford greater degrees of protection for highly resident species such as Caribbean reef sharks, yet still may provide substantial benefits for more migratory species such as tiger sharks. We discuss these findings within the context of species-habitat linkages, ecosystem services, and the establishment of future MPAs.
- Published
- 2021
- Full Text
- View/download PDF
5. Energetic connectivity of diverse elasmobranch populations – implications for ecological resilience
- Author
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Oliver N. Shipley, Philip Matich, Nigel E. Hussey, Annabelle M. L. Brooks, Demian Chapman, Michael G. Frisk, Annie E. Guttridge, Tristan L. Guttridge, Lucy A. Howey, Sami Kattan, Daniel J. Madigan, Owen O'Shea, Nicholas V. Polunin, Michael Power, Matthew J. Smukall, Eric V. C. Schneider, Brendan D. Shea, Brendan S. Talwar, Maggie Winchester, Edward J. Brooks, and Austin J. Gallagher
- Subjects
General Immunology and Microbiology ,General Medicine ,General Agricultural and Biological Sciences ,General Biochemistry, Genetics and Molecular Biology ,General Environmental Science - Abstract
Understanding the factors shaping patterns of ecological resilience is critical for mitigating the loss of global biodiversity. Throughout aquatic environments, highly mobile predators are thought to serve as important vectors of energy between ecosystems thereby promoting stability and resilience. However, the role these predators play in connecting food webs and promoting energy flow remains poorly understood in most contexts. Using carbon and nitrogen isotopes, we quantified the use of several prey resource pools (small oceanic forage, large oceanics, coral reef, and seagrass) by 17 species of elasmobranch fishes ( n = 351 individuals) in The Bahamas to determine their functional diversity and roles as ecosystem links. We observed remarkable functional diversity across species and identified four major groups responsible for connecting discrete regions of the seascape. Elasmobranchs were responsible for promoting energetic connectivity between neritic, oceanic and deep-sea ecosystems. Our findings illustrate how mobile predators promote ecosystem connectivity, underscoring their functional significance and role in supporting ecological resilience. More broadly, strong predator conservation efforts in developing island nations, such as The Bahamas, are likely to yield ecological benefits that enhance the resilience of marine ecosystems to combat imminent threats such as habitat degradation and climate change.
- Published
- 2023
6. Diving into the vertical dimension of elasmobranch movement ecology
- Author
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Samantha Andrzejaczek, Tim C.D. Lucas, Maurice C. Goodman, Nigel E. Hussey, Amelia J. Armstrong, Aaron Carlisle, Daniel M. Coffey, Adrian C. Gleiss, Charlie Huveneers, David M. P. Jacoby, Mark G. Meekan, Johann Mourier, Lauren R. Peel, Kátya Abrantes, André S. Afonso, Matthew J. Ajemian, Brooke N. Anderson, Scot D. Anderson, Gonzalo Araujo, Asia O. Armstrong, Pascal Bach, Adam Barnett, Mike B. Bennett, Natalia A. Bezerra, Ramon Bonfil, Andre M. Boustany, Heather D. Bowlby, Ilka Branco, Camrin D. Braun, Edward J. Brooks, Judith Brown, Patrick J. Burke, Paul Butcher, Michael Castleton, Taylor K. Chapple, Olivier Chateau, Maurice Clarke, Rui Coelho, Enric Cortes, Lydie I. E. Couturier, Paul D. Cowley, Donald A. Croll, Juan M. Cuevas, Tobey H. Curtis, Laurent Dagorn, Jonathan J. Dale, Ryan Daly, Heidi Dewar, Philip D. Doherty, Andrés Domingo, Alistair D. M. Dove, Michael Drew, Christine L. Dudgeon, Clinton A. J. Duffy, Riley G. Elliott, Jim R. Ellis, Mark V. Erdmann, Thomas J. Farrugia, Luciana C. Ferreira, Francesco Ferretti, John D. Filmalter, Brittany Finucci, Chris Fischer, Richard Fitzpatrick, Fabien Forget, Kerstin Forsberg, Malcolm P. Francis, Bryan R. Franks, Austin J. Gallagher, Felipe Galvan-Magana, Mirta L. García, Troy F. Gaston, Bronwyn M. Gillanders, Matthew J. Gollock, Jonathan R. Green, Sofia Green, Christopher A. Griffiths, Neil Hammerschlag, Abdi Hasan, Lucy A. Hawkes, Fabio Hazin, Matthew Heard, Alex Hearn, Kevin J. Hedges, Suzanne M. Henderson, John Holdsworth, Kim N. Holland, Lucy A. Howey, Robert E. Hueter, Nicholas E. Humphries, Melanie Hutchinson, Fabrice R. A. Jaine, Salvador J. Jorgensen, Paul E. Kanive, Jessica Labaja, Fernanda O. Lana, Hugo Lassauce, Rebecca S. Lipscombe, Fiona Llewellyn, Bruno C. L. Macena, Ronald Mambrasar, Jaime D. McAllister, Sophy R. McCully Phillips, Frazer McGregor, Matthew N. McMillan, Lianne M. McNaughton, Sibele A. Mendonça, Carl G. Meyer, Megan Meyers, John A. Mohan, John C. Montgomery, Gonzalo Mucientes, Michael K. Musyl, Nicole Nasby-Lucas, Lisa J. Natanson, John B. O’Sullivan, Paulo Oliveira, Yannis P. Papastamtiou, Toby A. Patterson, Simon J. Pierce, Nuno Queiroz, Craig A. Radford, Andy J. Richardson, Anthony J. Richardson, David Righton, Christoph A. Rohner, Mark A. Royer, Ryan A. Saunders, Matthias Schaber, Robert J. Schallert, Michael C. Scholl, Andrew C. Seitz, Jayson M. Semmens, Edy Setyawan, Brendan D. Shea, Rafid A. Shidqi, George L. Shillinger, Oliver N. Shipley, Mahmood S. Shivji, Abraham B. Sianipar, Joana F. Silva, David W. Sims, Gregory B. Skomal, Lara L. Sousa, Emily J. Southall, Julia L. Y. Spaet, Kilian M. Stehfest, Guy Stevens, Joshua D. Stewart, James A. Sulikowski, Ismail Syakurachman, Simon R. Thorrold, Michele Thums, David Tickler, Mariana T. Tolloti, Kathy A. Townsend, Paulo Travassos, John P. Tyminski, Jeremy J. Vaudo, Drausio Veras, Laurent Wantiez, Sam B. Weber, R.J. David Wells, Kevin C. Weng, Bradley M. Wetherbee, Jane E. Williamson, Matthew J. Witt, Serena Wright, Kelly Zilliacus, Barbara A. Block, David J. Curnick, Andrzejaczek, Samantha [0000-0002-9929-7312], Lucas, Tim CD [0000-0003-4694-8107], Goodman, Maurice C [0000-0002-6874-2313], Hussey, Nigel E [0000-0002-9050-6077], Armstrong, Amelia J [0000-0001-8103-4314], Carlisle, Aaron [0000-0003-0796-6564], Coffey, Daniel M [0000-0001-5983-0146], Huveneers, Charlie [0000-0001-8937-1358], Jacoby, David MP [0000-0003-2729-3811], Meekan, Mark G [0000-0002-3067-9427], Mourier, Johann [0000-0001-9019-1717], Peel, Lauren R [0000-0001-6960-5663], Abrantes, Kátya [0000-0001-7430-8428], Afonso, André S [0000-0001-9129-278X], Ajemian, Matthew J [0000-0002-2725-4030], Anderson, Brooke N [0000-0003-4299-3496], Araujo, Gonzalo [0000-0002-4708-3638], Armstrong, Asia O [0000-0002-9307-0598], Barnett, Adam [0000-0001-7430-8428], Bennett, Mike B [0000-0001-8051-0040], Bezerra, Natalia A [0000-0002-4203-8408], Bonfil, Ramon [0000-0002-5753-464X], Boustany, Andre M [0000-0001-5501-7190], Bowlby, Heather D [0000-0002-2532-3725], Branco, Ilka [0000-0001-8136-2596], Braun, Camrin D [0000-0002-9317-9489], Brooks, Edward J [0000-0001-5206-7133], Burke, Patrick J [0000-0002-7217-0215], Butcher, Paul [0000-0001-7338-6037], Castleton, Michael [0000-0001-9639-6967], Chapple, Taylor K [0000-0002-0357-0223], Chateau, Olivier [0000-0003-1153-6284], Coelho, Rui [0000-0003-3813-5157], Cortes, Enric [0000-0001-6001-2482], Couturier, Lydie IE [0000-0002-3885-3397], Cuevas, Juan M [0000-0003-0086-5963], Curtis, Tobey H [0000-0003-0164-7335], Dale, Jonathan J [0000-0001-8565-3841], Daly, Ryan [0000-0002-4409-6951], Dewar, Heidi [0000-0002-8202-1387], Doherty, Philip D [0000-0001-7561-3731], Domingo, Andrés [0000-0002-1793-7663], Dove, Alistair DM [0000-0003-3239-4772], Drew, Michael [0000-0002-5109-7792], Dudgeon, Christine L [0000-0001-5059-7886], Duffy, Clinton AJ [0000-0002-3352-1609], Elliott, Riley G [0000-0003-0234-5953], Erdmann, Mark V [0000-0002-3644-8347], Farrugia, Thomas J [0000-0001-9052-8826], Ferreira, Luciana C [0000-0001-6755-2799], Ferretti, Francesco [0000-0001-9510-3552], Finucci, Brittany [0000-0003-1315-2946], Forget, Fabien [0000-0002-4845-4277], Forsberg, Kerstin [0000-0002-1233-9381], Franks, Bryan R [0000-0003-4016-9225], Gallagher, Austin J [0000-0003-1515-3440], García, Mirta L [0000-0003-0143-7397], Gaston, Troy F [0000-0003-0049-0831], Gillanders, Bronwyn M [0000-0002-7680-2240], Green, Jonathan R [0000-0001-7671-6716], Green, Sofia [0000-0002-2878-5984], Griffiths, Christopher A [0000-0001-7203-0426], Hammerschlag, Neil [0000-0001-9002-9082], Hawkes, Lucy A [0000-0002-6696-1862], Hearn, Alex [0000-0002-4986-098X], Hedges, Kevin J [0000-0002-2219-2360], Holland, Kim N [0000-0003-4663-7026], Howey, Lucy A [0000-0001-7381-4871], Humphries, Nicholas E [0000-0003-3741-1594], Hutchinson, Melanie [0000-0001-7042-0658], Jaine, Fabrice RA [0000-0002-9304-5034], Jorgensen, Salvador J [0000-0002-4331-1648], Kanive, Paul E [0000-0003-2430-6920], Labaja, Jessica [0000-0001-6916-7050], Lana, Fernanda O [0000-0001-7235-069X], Lassauce, Hugo [0000-0001-9636-6522], Lipscombe, Rebecca S [0000-0001-9602-643X], Llewellyn, Fiona [0000-0003-4309-8311], Macena, Bruno CL [0000-0001-5010-8560], McCully Phillips, Sophy R [0000-0003-3110-5916], McGregor, Frazer [0000-0002-7441-4404], McMillan, Matthew N [0000-0001-6348-184X], Mendonça, Sibele A [0000-0002-1981-5950], Mohan, John A [0000-0002-2758-163X], Mucientes, Gonzalo [0000-0001-6650-3020], Musyl, Michael K [0000-0003-4719-9259], Nasby-Lucas, Nicole [0000-0001-8355-9392], Natanson, Lisa J [0000-0002-2903-6037], O'Sullivan, John B [0000-0002-1689-2141], Oliveira, Paulo [0000-0001-7697-2111], Papastamtiou, Yannis P [0000-0002-6091-6841], Patterson, Toby A [0000-0002-7150-9205], Pierce, Simon J [0000-0002-9375-5175], Queiroz, Nuno [0000-0002-3860-7356], Radford, Craig A [0000-0001-7949-9497], Richardson, Andy J [0000-0003-2598-5080], Richardson, Anthony J [0000-0002-9289-7366], Righton, David [0000-0001-8643-3672], Rohner, Christoph A [0000-0001-8760-8972], Royer, Mark A [0000-0002-6938-7536], Schaber, Matthias [0000-0003-1032-4626], Schallert, Robert J [0000-0002-3584-2668], Scholl, Michael C [0000-0002-6014-1759], Semmens, Jayson M [0000-0003-1742-6692], Setyawan, Edy [0000-0001-6629-5997], Shea, Brendan D [0000-0001-7771-0586], Shillinger, George L [0000-0001-5168-4551], Shipley, Oliver N [0000-0001-5163-3471], Sianipar, Abraham B [0000-0003-4049-3893], Silva, Joana F [0000-0002-2897-1410], Sims, David W [0000-0002-0916-7363], Sousa, Lara L [0000-0002-4392-3572], Southall, Emily J [0000-0001-7246-278X], Spaet, Julia LY [0000-0001-8703-1472], Stevens, Guy [0000-0002-2056-9830], Sulikowski, James A [0000-0002-3646-5200], Thums, Michele [0000-0002-8669-8440], Tickler, David [0000-0001-7722-0771], Tolloti, Mariana T [0000-0001-6895-2479], Townsend, Kathy A [0000-0002-2581-2158], Travassos, Paulo [0000-0001-8667-5292], Tyminski, John P [0000-0001-8251-7385], Vaudo, Jeremy J [0000-0002-6826-3822], Veras, Drausio [0000-0001-5627-6848], Wantiez, Laurent [0000-0001-5024-2057], Weber, Sam B [0000-0003-1447-4082], Wells, RJ David [0000-0002-1306-0614], Weng, Kevin C [0000-0002-7069-7152], Wetherbee, Bradley M [0000-0002-3753-8950], Williamson, Jane E [0000-0003-3627-4508], Witt, Matthew J [0000-0002-9498-5378], Zilliacus, Kelly [0000-0001-9166-5611], Block, Barbara A [0000-0001-5181-3616], Curnick, David J [0000-0002-3093-1282], Apollo - University of Cambridge Repository, Zoological Society of London - ZSL (UNITED KINGDOM), Centre de recherches insulaires et observatoire de l'environnement (CRIOBE), Université de Perpignan Via Domitia (UPVD)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), MARine Biodiversity Exploitation and Conservation (UMR MARBEC), and Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)
- Subjects
Multidisciplinary ,[SDV]Life Sciences [q-bio] ,Violacea Bonaparte ,3103 Ecology ,Pelagic stingray ,Scalloped hammerhead shark ,41 Environmental Sciences ,Western North Pacific ,Reproductive-biology ,Habitat Use ,Carcharhinus-falciformis ,Galeocerdo-cuvier ,Sexual segregation ,Sphyna-lewini ,31 Biological Sciences - Abstract
20 pages, 3 tables, 5 figures.-- Samantha Andrzejaczek ... et al.-- Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC), Knowledge of the three-dimensional movement patterns of elasmobranchs is vital to understand their ecological roles and exposure to anthropogenic pressures. To date, comparative studies among species at global scales have mostly focused on horizontal movements. Our study addresses the knowledge gap of vertical movements by compiling the first global synthesis of vertical habitat use by elasmobranchs from data obtained by deployment of 989 biotelemetry tags on 38 elasmobranch species. Elasmobranchs displayed high intra- and interspecific variability in vertical movement patterns. Substantial vertical overlap was observed for many epipelagic elasmobranchs, indicating an increased likelihood to display spatial overlap, biologically interact, and share similar risk to anthropogenic threats that vary on a vertical gradient. We highlight the critical next steps toward incorporating vertical movement into global management and monitoring strategies for elasmobranchs, emphasizing the need to address geographic and taxonomic biases in deployments and to concurrently consider both horizontal and vertical movements, Data analysis was funded by the Bertarelli Foundation through the Marine Science program through grants to D.J.C., B.A.B., and S.A. D.J.C. is also funded through Research England, UK. S.A. and B.A.B. thank the Moore Foundation and the Packard Foundation. F.G.-M. thanks the Instituto Politecnico Nacional for fellowships (COFAA, EDI). S.B.W. thanks funding from the Darwin Initiative (DPLUS046). A.D.M.D. acknowledges funding from the Research and Conservation Budget at Georgia Aquarium, including philanthropic gifts from several anonymous donors. K.F. acknowledges funding from the Rolex Awards for Enterprise and the Whitley Fund for Nature
- Published
- 2022
7. Oceans
- Author
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Brendan D. Shea, Austin J. Gallagher, and Fish and Wildlife Conservation
- Subjects
0303 health sciences ,Jellyfish ,biology ,Specific function ,Novel object ,Cyanea (jellyfish) ,GC1-1581 ,030204 cardiovascular system & hematology ,biology.organism_classification ,Oceanography ,Object (philosophy) ,innovation ,lion’s mane jellyfish ,Fishery ,Humpback whale ,03 medical and health sciences ,0302 clinical medicine ,New england ,Geography ,biology.animal ,object use ,cetacean ,humpback whale ,Lion's mane jellyfish ,030304 developmental biology - Abstract
Cetaceans are well-known for their intelligence, charismatic nature, and curiosity. Many species, particularly odontocetes, are known to investigate and manipulate novel objects they encounter. Yet, disentangling the drivers of these behaviors and distinguishing between those that are simply playful and those which serve a specific function remains challenging due to a lack of direct observations and detailed descriptions of behaviors. This is particularly true for mysticetes such as humpback whales (Megaptera novaeangliae), as records of object use are far less common than in odontocetes. Here, we present evidence of novel object use from a first of its kind encounter between an individual humpback whale and a large lion’s mane jellyfish (Cyanea capillata) in the coastal waters off New England. We detail the interaction and discuss possible drivers for the behavior, with a focus on cetacean innovation, ectoparasite removal, and wound healing. Published version
- Published
- 2021
8. Physiological consequences of varying large shark exposure on striped bass (Morone saxatilis)
- Author
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Steven J. Cooke, C. de Silva, C. W. Benson, D. Donovan, Peter E. Holder, Austin J. Gallagher, and Brendan D. Shea
- Subjects
0106 biological sciences ,food.ingredient ,Morone saxatilis ,010604 marine biology & hydrobiology ,Zoology ,Biology ,010603 evolutionary biology ,01 natural sciences ,Predation ,Optimal foraging theory ,Bass (fish) ,food ,Animal Science and Zoology ,Ecology, Evolution, Behavior and Systematics - Abstract
Large marine predators often aggregate seasonally in discrete locations to take advantage of optimal foraging conditions, leading to spatial and temporal variation in their exposure on other species. However, our understanding of the impacts this exposure may have on the behavior and physiology of prey is poor, especially in marine systems. Here, we evaluated the non-consumptive effects of potential exposure to large sharks (white sharks, Carcharodon carcharias (Linnaeus, 1758)) on the stress physiology of an economically important teleost, the striped bass (Morone saxatilis (Walbaum, 1792)), off Cape Cod, Massachusetts, USA. We sampled fish in habitats that varied significantly in shark exposure across 5 months and over 2 years, evaluating blood physiology stress indicators (i.e., cortisol, glucose, and lactate concentrations) and reflex impairment. None of the blood parameters were influenced by shark exposure, although we did observe subtle temperature and seasonal effects. One of the three reflex tests (the vertical orientation test) was negatively affected by shark exposure, although the mechanistic basis for this finding is unclear. This work supports the notion that predictable sources of predation pressure tend not to manifest in stress-related costs in free-ranging prey, which has implications for shaping our understanding of how large sharks influence ecosystems through non-consumptive effects.
- Published
- 2019
9. Frontiers in Marine Science
- Author
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Austin J. Gallagher, Nourah A. Alsudairy, Brendan D. Shea, Nicholas L. Payne, and Carlos M. Duarte
- Subjects
0106 biological sciences ,Science ,Real-time computing ,Ocean Engineering ,Video camera ,QH1-199.5 ,Aquatic Science ,Oceanography ,010603 evolutionary biology ,01 natural sciences ,shark ,law.invention ,law ,Research community ,Water Science and Technology ,Scientific instrument ,Global and Planetary Change ,biology ,010604 marine biology & hydrobiology ,telemetry ,Logging ,General. Including nature conservation, geographical distribution ,biology.organism_classification ,monitoring ,Swimming speed ,Habitat ,Imaging technology ,bio-logging ,Tiger shark ,camera - Abstract
Animal-borne video camera systems have long-been used to capture the fine-scale behaviors and unknown aspects of the biology of marine animals. However, their utility to serve as robust scientific tools in the greater bio-logging research community has not been fully realized. Here we provide, for the first time, an application of 360-degree camera technology to a marine organism, using a large tiger shark as a proof-ofconcept case study. Leveraging the three-dimensional nature of the imaging technology, we derived 224 seafloor habitat assessments over the course of the nearly 1-h track, whereby the shark was able to survey similar to 23,000 square meters of seafloor; over threetimes greater than the capacity of non 360-degree cameras. The resulting data provided detailed information on habitat use, diving behavior, and swimming speed, as well seafloor mapping. Our results suggest that 360-degree cameras provide complimentary benefits-and in some cases superior efficiency-than unidirectional video packages, with an enhanced capacity to map seafloor. Wanderlust Fund; National GeographicNational Geographic Society Published version This work was supported by grants to AG from the Wanderlust Fund, National Geographic, and was also facilitated by Hazmat Productions and Discovery Channel. These funders were not involved in the study design, collection, analysis, interpretation of data, the writing of this article or the decision to submit it for publication.
- Published
- 2021
10. Recreational fishing fight times are not correlated with physiological status of blue sharks (Prionace glauca) in the Northwestern Atlantic
- Author
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Brendan D. Shea, Sydney K. Coulter, Kelly E. Dooling, Hana L. Isihara, Jessica C. Roth, Elliot Sudal, Donald J. Donovan, Lisa A. Hoopes, Alistair D.M. Dove, Steven J. Cooke, and Austin J. Gallagher
- Subjects
Aquatic Science - Published
- 2022
11. Global COVID-19 lockdown highlights humans as both threats and custodians of the environment
- Author
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Francesca Cagnacci, Anastasios Bounas, Víctor Vázquez, Volen Arkumarev, Margarita Roa, Christopher J. Henderson, Neil Hammerschlag, Marc J. S. Hensel, Ian MacGregor-Fors, Catherine Hobaiter, Elijah Panipakoochoo, Gonzalo Mucientes, Million Tesfaye, Camilo E. Sánchez-Sarria, Dallas D'Silva, Grant Garner, Cloé Pourchier, Erin E. Posthumus, Zuania Colón-Piñeiro, Theresa M. Crimmins, Charlie Huveneers, Victor China, William D. Halliday, Avi Bar-Massada, Breyl X. K. Ng, Jennifer D. Reilly, Brendan J. Godley, Thibaud Gruber, Natalia Ocampo-Peñuela, Mitchell J. Rider, Lori Anne Barnett, Vladimir Dobrev, Nicholas D. Higgs, Christopher J. Patrick, Angélica Hernández-Palma, Kenneth B.H. Er, Rebecca A. Hutchinson, Harel Baz, Pia Anderwald, Marc Shellard, Camilo M. Botero, Sang Don Lee, Megan E. Hanna, Christopher D. Stallings, Yehezkel Buba, Pamela Carzon, Aroha Miller, David R. Barclay, Steffen Oppel, Juan Sebastian Ulloa, Víctor M. Eguíluz, Justin R. Perrault, Thomas A. Schlacher, Lisandro Benedetti-Cecchi, Victoria Saravia-Mullin, Nuno Queiroz, Fabio Bulleri, Zehava Sigal, Robert J. Orth, Jonas Hentati-Sundberg, Tomas J. Bird, Ron Chen, Jarod Lyon, Mengistu Wondafrash, Laurent Chauvaud, Gabriel Barros Gonçalves de Souza, Sarah J. L. Severino, Clive R. McMahon, Christian Requena-Mesa, Eulogio H. Soto, Amir Ayali, Jesse S. Lewis, Mark J. Costello, Miguel A. Furtado, Jessica P. Diaz-Orozco, Eleanor A. Weideman, Kyle Maclean, Frédéric LeTourneux, Lorenzo Sileci, Clementine Seguine, Sarah Abarro, Mackenzie B. Woods, David March, Qiang Yang, Katja Baerenfaller, Catherine M. Foley, Sharon Davidzon, David W. Sims, Ku'ulei S. Rodgers, Cheryl A. Frederick, Andrew G. Jeffs, Ohad Hatzofe, Yigael Ben Ari, Shmulik Yedvab, Cyril Piou, Gregory D. LeClair, Juan C. Franco Morales, Matthew G. Henderson, Cristian A. Cruz-Rodríguez, Ron Efrat, Tabi Karkom, Thomas A. Okey, Tudor Racoviceanu, Enrico Lunghi, Alazar Ruffo, Mohlamatsane M. Mokhatla, Ofer Yaakov, Stephanie M. Martin, Dobromir Dobrev, Matthew K. Pine, Dinusha R.M. Jayathilake, Antonia T. Cooper, Andrea Corradini, Eva Cacabelos, Yunior R. Velázquez, Amber Dearden, Iacopo Bertocci, Tal Gavriel, Sarah E. Hirsch, Elzbieta Kret, Meaghan E. Faletti, Matthew W. H. Chatfield, Lucy C. Woodall, Mary E. Clinton, Gal Badihi, Ilia Baskin, Carina Terry, Christopher G. Lowe, Joseph S. Curtis, Brandy S. Biggar, Nicole Esteban, Ellen G. Denny, Margot L. Hessing-Lewis, David Elustondo, Jeffrey Haight, Donna Gibbs, Robert L. Thomson, Maxim Larrivée, Matthew D. Adams, Camrin D. Braun, Mark G. Meekan, Brendan Connors, Avi Berkovitch, Jessica Schultz, Sigal Balshine, Lauren McWhinnie, Hanspeter Loetscher, Vicent Calatayud, Simon R. Thorrold, Christian Rutz, Nataliya A. Milchakova, Martin K.S. Smith, Stephanie K. Archer, Richard K. Dewey, Raoul Manenti, Kristina Boerder, Alon Penn, Ogen Licht, Susana Rodríguez-Buriticá, Zhu Liu, Rotem Sade, Michael B. Schrimpf, Nicola Koper, Rick D. Stuart-Smith, Austin J. Gallagher, Clayton T. Lamb, Reilly Rodriguez, Luca Pedrotti, Arjun Amar, Amanda E. Bates, Solomon Mengistu, Thierry Grandmont, Guojun He, Oliver N. Shipley, Sara N. Schaffer, Jorge P. Rodríguez, Cecilia Martin, Robin Hale, Simon A. Morley, Eyal Miller, Catherine Alexandra Gagnon, Sarah E. Dudas, Hyomin Park, Sally Hofmeyr, Paulson G. Des Brisay, Matthias-Claudio Loretto, Assaf Zvuloni, Elena Maggi, Jasmine A. Ballantyne, Susan J. Cunningham, Malcolm C.K. Soh, Elizabeth M. P. Madin, Sonja Wipf, David S. Hik, Stoyan C. Nikolov, Cameron J. Baker, Ben L. Gilby, Felipe A. Estela, Chiara Ravaglioli, Christophe Guinet, Alyssa Rosemartin, Lauren Dares, Gilles Gauthier, Michelle García-Arroyo, Luca Rindi, Oded Berger-Tal, Brendan D. Shea, Lucy Zipf, Michael S. Diamond, Shengjie Lai, Giann K. Aguirre-Samboní, Jennifer M. Jackson, Peter G. Ryan, Emily J. Southall, Kyle D. Kittelberger, Fabio C. De Leo, Jonathan Belmaker, Olof Olsson, Steven J. Cooke, Yuhang Pan, Rylan J. Command, Vincent Z. Kuuire, Kevin Wong, Reut Vardi, Xiangliang Zhang, Cristian Mihai Adamescu, Craig A. Radford, Enrique Arbeláez-Cortés, Andrew Graham, Joël Bêty, Charles Palmer, Yuval Zukerman, Miyako H. Warrington, Michael J. Schram, Amit Dolev, Orlando Acevedo-Charry, Claudio A. Quesada-Rodriguez, Kara R. Wall, Nikita Sergeenko, Celene B. Milanes, Jaein Choi, Paula Moraga, Jeff Switzer, Yenifer Herrera-Varón, Jonathan D. Midwood, Manor Gury, Amanda Weltman, Emiliano Mori, Thomas M. Clarke, Mai Lazarus, Jeffrey R. Parmelee, Petra Sumasgutner, Patrick T. Rex, Ziv Birman, Rodrigo Solis, Jennifer Chapman, Alejandro Bernal-Ibáñez, Vinay Udyawer, Itai Namir, David Ocampo, Justin A. Del Bel Belluz, Egide Kalisa, Reny P. Devassy, Pierre Legagneux, Jorge Ramírez-González, Jessleena Suri, Shelby R. Hoover, Michelle E. Taylor, Carlos M. Duarte, Ana F. L. Sobral, Graham J. Edgar, Francesc Peters, Philina A. English, Francis Juanes, Lisa C. Lacko, Marta Coll, Gentile Francesco Ficetola, Nicolas Moity, Emily Weigel, Nathan R. Geraldi, Jill L. Brooks, Philippe Archambault, Nicholas A. W. Brown, Julia Wakeling, Tanya Otero, Matt Rothendler, Shira Salingré, Laura Borden, Richard B. Primack, Veronica Nanni, Miqkayla Stofberg, Guy Lavian, Jacob W. Brownscombe, Samuel Bakari, Jonathan A. Peake, Andrew D. Olds, Paris V. Stefanoudis, Patricia S. Albano, Alexandre Alonso-Fernández, Seth G. Cherry, Juan Fernández-Gracia, Çağan H. Şekercioğlu, Shahar Malamud, Eric Clua, Jeannette Bedard, Dugald Thomson, Josip Kusak, Uri Roll, Louise Wilson, Craig E. Franklin, Roanna Y. T. Pang, Jose Manuel Ochoa-Quintero, Lina María Sánchez-Clavijo, Julien Bonnel, Sorin Cheval, Christine M. Boston, Mark A. Hindell, R. L. Marsh, Ruthy Yahel, Samuel Wiesmann, Frédéric Dulude de-Broin, Adrian H.B. Loo, Ross G. Dwyer, Takahiro Shimada, M. Ortega, Laura P. Kroesen, Ignacio Gestoso, Bibiana Gómez-Valencia, Valeria Vergara, Takanao Tanaka, Fiona Francis, Benjamin P. Y.-H. Lee, Delphine Mathias, Steven Mihaly, Kathleen L. Prudic, Alessia Scuderi, Dana Haggarty, Kent P. McFarland, Katharine L. Gerst, Paul B. Day, Vikram Aditya, Graeme C. Hays, Cerren Richards, Jeffrey A. Seminoff, Robert Harcourt, Matthew P. Stefanak, European Commission, Agencia Estatal de Investigación (España), Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), Department of Ocean Sciences [Newfoudland, Canada] (Memorial University of Newfoundland), Memorial University of Newfoundland (Memorial University of Newfoundland)-Department of Biology, Memorial University of Newfoundland, Gordon and Betty Moore Foundation, National Geographic Society, University of St Andrews. School of Biology, University of St Andrews. Centre for Biological Diversity, University of St Andrews. Centre for Social Learning & Cognitive Evolution, and Group, PAN-Environment Working
- Subjects
0106 biological sciences ,QH301 Biology ,Politique sanitaire ,Biodiversity ,GF Human ecology. Anthropogeography ,01 natural sciences ,3rd-NDAS ,Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Zoogeografi: 486 [VDP] ,RA0421 ,RA0421 Public health. Hygiene. Preventive Medicine ,Pandemic ,Enforcement ,GE ,pandémie ,évaluation de l'impact social ,COVID-19 ,lockdown ,human activity ,wildlife ,environmental treats ,GF ,Global monitoring ,S50 - Santé humaine ,Nature Conservation ,Restoration ,[SDE]Environmental Sciences ,Conservation de la nature ,P01 - Conservation de la nature et ressources foncières ,Samfunnsvitenskap: 200::Samfunnsgeografi: 290 [VDP] ,GE Environmental Sciences ,Coronavirus disease 2019 (COVID-19) ,Wildlife ,010603 evolutionary biology ,Surveillance de l’environnement ,Article ,QH301 ,Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Etologi: 485 [VDP] ,Dual role ,SDG 3 - Good Health and Well-being ,Settore BIO/07 - ECOLOGIA ,Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 [VDP] ,14. Life underwater ,Environmental planning ,Ecology, Evolution, Behavior and Systematics ,Nature and Landscape Conservation ,Custodians ,010604 marine biology & hydrobiology ,Impact sur l'environnement ,Évaluation de l'impact ,15. Life on land ,Protection de l'environnement ,13. Climate action ,Business ,Gestion de l'environnement - Abstract
18 pages, 5 figures, supplementary data https://doi.org/10.1016/j.biocon.2021.109175.-- The data supporting the findings of this study are available in the Supplementary Materials (Appendix 3–5, Table A3-A5). Raw datasets (where available) and results summary tables for each analysis of human mobility and empirical datasets are deposited in a github repository: https://github.com/rjcommand/PAN-Environment, The global lockdown to mitigate COVID-19 pandemic health risks has altered human interactions with nature. Here, we report immediate impacts of changes in human activities on wildlife and environmental threats during the early lockdown months of 2020, based on 877 qualitative reports and 332 quantitative assessments from 89 different studies. Hundreds of reports of unusual species observations from around the world suggest that animals quickly responded to the reductions in human presence. However, negative effects of lockdown on conservation also emerged, as confinement resulted in some park officials being unable to perform conservation, restoration and enforcement tasks, resulting in local increases in illegal activities such as hunting. Overall, there is a complex mixture of positive and negative effects of the pandemic lockdown on nature, all of which have the potential to lead to cascading responses which in turn impact wildlife and nature conservation. While the net effect of the lockdown will need to be assessed over years as data becomes available and persistent effects emerge, immediate responses were detected across the world. Thus initial qualitative and quantitative data arising from this serendipitous global quasi-experimental perturbation highlights the dual role that humans play in threatening and protecting species and ecosystems. Pathways to favorably tilt this delicate balance include reducing impacts and increasing conservation effectiveness, The Canada Research Chairs program provided funding for the core writing team. Field research funding was provided by A.G. Leventis Foundation; Agence Nationale de la Recherche, [grant number ANR-18-32–0010CE-01 (JCJC PEPPER)]; Agencia Estatal de Investigaci; Agência Regional para o Desenvolvimento da Investigação Tecnologia e Inovação (ARDITI), [grant number M1420-09-5369-FSE-000002]; Alan Peterson; ArcticNet; Arkadaşlar; Army Corp of Engineers; Artificial Reef Program; Australia's Integrated Marine Observing System (IMOS), National Collaborative; Research Infrastructure Strategy (NCRIS), University of Tasmania; Australian Institute of Marine Science; Australian Research Council, [grant number LP140100222]; Bai Xian Asia Institute; Batubay Özkan; BC Hydro Fish and Wildlife Compensation Program; Ben-Gurion University of the Negev; Bertarelli Foundation; Bertarelli Programme in Marine Science; Bilge Bahar; Bill and Melinda Gates Foundation; Biology Society of South Australia; Boston University; Burak Över; California State Assembly member Patrick O'Donnell; California State University Council on Ocean Affairs, Science & Technology; California State University Long Beach; Canada Foundation for Innovation (Major Science Initiative Fund and funding to Oceans Network Canada), [grant number MSI 30199 for ONC]; Cape Eleuthera Foundation; Centre National d'Etudes Spatiales; Centre National de la Recherche Scientifique; Charles Darwin Foundation, [grant number 2398]; Colombian Institute for the Development of Science and Technology (COLCIENCIAS), [grant number 811–2018]; Colombian Ministry of Environment and Sustainable Development, [grant number 0041–2020]; Columbia Basin Trust; Commission for Environmental Cooperation; Cornell Lab of Ornithology; Cultural practices and environmental certification of beaches, Universidad de la Costa, Colombia, [grant number INV.1106–01–002-15, 2020–21]; Department of Conservation New Zealand; Direction de l'Environnement de Polynésie Française; Disney Conservation Fund; DSI-NRF Centre of; Excellence at the FitzPatrick Institute of African Ornithology; Ecology Project International; Emin Özgür; Environment and Climate Change Canada; European Community: RTD programme - Species Support to Policies; European Community's Seventh Framework Programme; European Union; European Union's Horizon 2020 research and innovation programme, Marie Skłodowska-Curie, [grant number 798091, 794938]; Faruk Eczacıbaşı; Faruk Yalçın Zoo; Field research funding was provided by King Abdullah University of Science and Technology; Fish and Wildlife Compensation Program; Fisheries and Oceans Canada; Florida Fish and Wildlife Conservation Commission, [grant numbers FWC-12164, FWC-14026, FWC-19050]; Fondo Europeo de Desarrollo Regional; Fonds québécois de la recherche nature et technologies; Foundation Segré; Fundação para a Ciência e a Tecnologia (FCT Portugal); Galapagos National Park Directorate research, [grant number PC-41-20]; Gordon and Betty Moore Foundation, [grant number GBMF9881 and GBMF 8072]; Government of Tristan da Cunha; Habitat; Conservation Trust Foundation; Holsworth Wildlife Research Endowment; Institute of Biology of the Southern Seas, Sevastopol, Russia; Instituto de Investigación de Recursos Biológicos Alexander von Humboldt; Instituto Nacional de Pesquisas Espaciais (INPE), Brazil; Israeli Academy of Science's Adams Fellowship; King Family Trust; Labex, CORAIL, France; Liber Ero Fellowship; LIFE (European Union), [grant number LIFE16 NAT/BG/000874]; María de Maeztu Program for Units of Excellence in R&D; Ministry of Science and Innovation, FEDER, SPASIMM,; Spain, [grant number FIS2016–80067-P (AEI/FEDER, UE)]; MOE-Korea, [grant number 2020002990006]; Mohamed bin Zayed Species Conservation Fund; Montreal Space for Life; National Aeronautics and Space Administration (NASA) Earth and Space Science Fellowship Program; National Geographic Society, [grant numbers NGS-82515R-20]; National Natural Science Fund of China; National Oceanic and Atmospheric Administration; National Parks Board, Singapore; National Science and Technology Major Project of China; National Science Foundation, [grant number DEB-1832016]; Natural Environment Research Council of the UK; Natural Sciences and Engineering Research Council of Canada (NSERC), Alliance COVID-19 grant program, [grant numbers ALLRP 550721–20, RGPIN-2014-06229 (year: 2014), RGPIN-2016-05772 (year: 2016)]; Neiser Foundation; Nekton Foundation; Network of Centre of Excellence of Canada: ArcticNet; North Family Foundation; Ocean Tracking Network; Ömer Külahçıoğlu; Oregon State University; Parks Canada Agency (Lake Louise, Yoho, and Kootenay Field Unit); Pew Charitable Trusts; Porsim Kanaf partnership; President's International Fellowship Initiative for postdoctoral researchers Chinese Academy of Sciences, [grant number 2019 PB0143]; Red Sea Research Center; Regional Government of the Azores, [grant number M3.1a/F/025/2015]; Regione Toscana; Rotary Club of Rhinebeck; Save our Seas Foundation; Science & Technology (CSU COAST); Science City Davos, Naturforschende Gesellschaft Davos; Seha İşmen; Sentinelle Nord program from the Canada First Research Excellence Fund; Servizio Foreste e Fauna (Provincia Autonoma di Trento); Sigrid Rausing Trust; Simon Fraser University; Sitka Foundation; Sivil Toplum Geliştirme Merkezi Derneği; South African National Parks (SANParks); South Australian Department for Environment and Water; Southern California Tuna Club (SCTC); Spanish Ministry for the Ecological Transition and the Demographic Challenge; Spanish Ministry of Economy and Competitiveness; Spanish Ministry of Science and Innovation; State of California; Sternlicht Family Foundation; Suna Reyent; Sunshine Coast Regional Council; Tarea Vida, CEMZOC, Universidad de Oriente, Cuba, [grant number 10523, 2020]; Teck Coal; The Hamilton Waterfront Trust; The Ian Potter Foundation, Coastwest, Western Australian State NRM; The Red Sea Development Company; The Wanderlust Fund; The Whitley Fund; Trans-Anatolian Natural Gas Pipeline; Tula Foundation (Hakai Institute); University of Arizona; University of Pisa; US Fish and Wildlife Service; US Geological Survey; Valencian Regional Government; Vermont Center for Ecostudies; Victorian Fisheries Authority; VMRC Fishing License Fund; and Wildlife Warriors Worldwide, With funding from the Spanish government through the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000928-S
- Published
- 2021
- Full Text
- View/download PDF
12. Effects of exposure to large sharks on the abundance and behavior of mobile prey fishes along a temperate coastal gradient
- Author
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Connor W. Benson, Christine de Silva, Scott Creel, Joe Romeiro, Don Donovan, Austin J. Gallagher, Brendan D. Shea, and Mark E. Bond
- Subjects
0106 biological sciences ,Binomials ,Predation ,Social Sciences ,01 natural sciences ,Polynomials ,Abundance (ecology) ,Psychology ,Foraging ,Chondrichthyes ,Apex predator ,Multidisciplinary ,biology ,Geography ,Ecology ,Animal Behavior ,Fishes ,Eukaryota ,Trophic Interactions ,Community Ecology ,Dogfish ,Vertebrates ,Physical Sciences ,Medicine ,Research Article ,food.ingredient ,Fish Biology ,Science ,Movement ,Context (language use) ,010603 evolutionary biology ,Fish physiology ,food ,Fish Physiology ,Animals ,Animal Physiology ,Community Structure ,Ecosystem ,Behavior ,010604 marine biology & hydrobiology ,Ecology and Environmental Sciences ,Organisms ,Biology and Life Sciences ,Environmental Exposure ,biology.organism_classification ,Vertebrate Physiology ,Carcharias ,Carcharodon ,Fishery ,Fish ,Algebra ,Predatory Behavior ,Sharks ,human activities ,Zoology ,Mathematics ,Elasmobranchii - Abstract
Top predators can exert strong influences on community structure and function, both via direct, consumptive effects, as well as through non-consumptive, fear-based effects (i.e. predation risk). However, these effects are challenging to quantify, particularly for mobile predators in marine ecosystems. To advance this field of research, here we used baited remote underwater video stations (BRUVs) to assess how the behavior of mobile fish species off Cape Cod, Massachusetts, was affected by exposure to large sharks. We categorized sites into three levels of differential shark predation exposure (white sharks, Carcharodon carcharias) and quantified the relative abundance and arrival times (elapsed time before appearing on screen) for six mobile fish prey groups to the BRUV stations. Increased large shark exposure was associated with a decrease in overall prey abundance, but the overall response was prey group-specific. Foraging of smooth dogfish, a likely important prey item for large sharks in the system, was significantly reduced in areas frequented by white sharks. Specifically, the predicted probabilities of smooth dogfish bait contacts or bite attempts occurring were reduced by factors of 5.7 and 8.4, respectively, in areas of high exposure as compared to low exposure. These modifications were underscored by a decrease in smooth dogfish abundance in areas of high exposure as well. Our results suggest that populations of large, roving sharks may induce food-related costs in prey. We discuss the implications of this work within the context of the control of risk (COR) hypothesis, for the purposes of advancing our understanding of the ecological role and effects of large sharks on coastal marine ecosystems.
- Published
- 2019
13. Effects of exposure to large sharks on the abundance and behavior of mobile prey fishes along a temperate coastal gradient.
- Author
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Brendan D Shea, Connor W Benson, Christine de Silva, Don Donovan, Joe Romeiro, Mark E Bond, Scott Creel, and Austin J Gallagher
- Subjects
Medicine ,Science - Abstract
Top predators can exert strong influences on community structure and function, both via direct, consumptive effects, as well as through non-consumptive, fear-based effects (i.e. predation risk). However, these effects are challenging to quantify, particularly for mobile predators in marine ecosystems. To advance this field of research, here we used baited remote underwater video stations (BRUVs) to assess how the behavior of mobile fish species off Cape Cod, Massachusetts, was affected by exposure to large sharks. We categorized sites into three levels of differential shark predation exposure (white sharks, Carcharodon carcharias) and quantified the relative abundance and arrival times (elapsed time before appearing on screen) for six mobile fish prey groups to the BRUV stations. Increased large shark exposure was associated with a decrease in overall prey abundance, but the overall response was prey group-specific. Foraging of smooth dogfish, a likely important prey item for large sharks in the system, was significantly reduced in areas frequented by white sharks. Specifically, the predicted probabilities of smooth dogfish bait contacts or bite attempts occurring were reduced by factors of 5.7 and 8.4, respectively, in areas of high exposure as compared to low exposure. These modifications were underscored by a decrease in smooth dogfish abundance in areas of high exposure as well. Our results suggest that populations of large, roving sharks may induce food-related costs in prey. We discuss the implications of this work within the context of the control of risk (COR) hypothesis, for the purposes of advancing our understanding of the ecological role and effects of large sharks on coastal marine ecosystems.
- Published
- 2020
- Full Text
- View/download PDF
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