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Lakenarine R, Chhetri N, Chhetri N, Senko J. Characterization of small-scale net fisheries off the coast of Guyana. PLoS One 2024; 19:e0306332. [PMID: 38941279 PMCID: PMC11213293 DOI: 10.1371/journal.pone.0306332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Accepted: 06/14/2024] [Indexed: 06/30/2024] Open
Abstract
Fish stocks have declined rapidly over the past half-century due to the increased demand for seafood and unsustainable fishing practices. The incidental capture of non-target species (bycatch) is a pervasive issue in fisheries management and has led to population declines in non-target species worldwide. The fisheries sector in Guyana currently supports the livelihoods of over 10,000 Guyanese and contributes approximately 2% to the country's GDP. Bycatch is believed to be a major threat to Guyana's marine fisheries, especially the small-scale sector, due to a lack of management infrastructure and limited data and monitoring. Here, we assessed bycatch in Guyana's artisanal gillnet and Chinese seine fisheries through vessel observations and semi-structured interviews with local fishers. Most of the discarded species documented had no commercial importance to the fisheries in Guyana. Although no statistical difference was observed among the bycatch rates in the gillnet and Chinese seine fisheries, the latter generally had more discarded individuals, most of which were juveniles. The Shannon-Weiner diversity index showed a greater diversity of bycatch species in the gillnet fisheries compared to the Chinese seine. Jaccard's similarity index indicated a low similarity among the gear types. Even though most fishers were aware of bycatch, they did not view it as a major issue and were not interested in reducing their discards. We recommend a collaborative approach in exploring solutions to ensure the ecological and socioeconomic sustainability of the fisheries sector.
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Affiliation(s)
- Rovindra Lakenarine
- School for the Future of Innovation in Society, College of Global Futures, Arizona State University, Tempe, Arizona, United States of America
- Department of Biology, Faculty of Natural Sciences, University of Guyana, Georgetown, Guyana
| | - Netra Chhetri
- School for the Future of Innovation in Society, College of Global Futures, Arizona State University, Tempe, Arizona, United States of America
| | - Neha Chhetri
- School for the Future of Innovation in Society, College of Global Futures, Arizona State University, Tempe, Arizona, United States of America
| | - Jesse Senko
- School for the Future of Innovation in Society, College of Global Futures, Arizona State University, Tempe, Arizona, United States of America
- School of Ocean Futures, College of Global Futures, Arizona State University, Tempe, Arizona, United States of America
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2
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Hatch JM, Murray KT, Patel S, Smolowitz R, Haas HL. Evaluating simple measures of spatial-temporal overlap as a proxy for encounter risk between a protected species and commercial fishery. FRONTIERS IN CONSERVATION SCIENCE 2023. [DOI: 10.3389/fcosc.2023.1118418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023] Open
Abstract
Spatial and temporal assessments of overlap are becoming increasingly popular as indicators of encounter risk. The overlap in distributions between protected species and commercial fishing effort is of interest for reducing bycatch. We explored overlap between the U.S. Atlantic sea scallop fishery and loggerhead turtles (Caretta caretta) using 2 metrics, and we assessed the ability of one of those metrics to track estimated fishery interactions over time. Moderate overlap occurred between June - September; mild overlap in the spring (May) and fall (October - November); and relatively little overlap from December to April. Qualitatively, there appeared to be some correspondence between the overlap values averaged across months for each calendar year and published annual loggerhead interaction estimates with fisheries, but the predictive performance of the overlap metric was low. When data on the relative distributions of commercial fishing effort and protected species are available, simple measures of spatial and temporal overlap can provide a quick and cost-effective way to identify when and where bycatch is likely to occur. In this case study, however, overlap was limited in helping to understand the relative susceptibility of protected species to commercial fishing (i.e., magnitude of interactions). We therefore caution against using overlap as a meaningful predictor of absolute risk unless there is direct evidence to suggest a relationship.
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Lusseau D, Kindt-Larsen L, van Beest FM. Emergent interactions in the management of multiple threats to the conservation of harbour porpoises. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 855:158936. [PMID: 36152860 DOI: 10.1016/j.scitotenv.2022.158936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 09/09/2022] [Accepted: 09/18/2022] [Indexed: 06/16/2023]
Abstract
Human activities at sea are intensifying and diversifying. This is leading to more complex interactions of anthropogenic impacts requiring adaptable management interventions to mitigate their cumulative effects on biodiversity conservation and restoration objectives. Bycatch remains the dominant conservation threat for coastal cetaceans. Additionally, the indirect impact of repeated exposure to disturbances, particularly acoustic disturbances, can affect cetacean population growth and therefore conservation objectives. Pingers are used to ensonify nets to provide an effective mitigation of bycatch risk. As those become more prevalent across fisheries at risk to catch for example harbour porpoises, pingers become contributors to the anthropogenic noise landscape which may affect the vital rates of this species as well. Currently, we do not know how to best balance pinger prevalence to minimise both bycatch rate and the population consequences of acoustic disturbance (PCoD). Here we use an agent-based model to determine how pinger prevalence in nets can be adjusted to minimise bycatch rate and noise disturbance propagating to affect population growth for harbour porpoises. We show that counter-intuitively bycatch rate can increase at lower pinger prevalence. When ecological conditions are such that PCOD can emerge, higher prevalence of pingers can lead to indirect effects on population growth. This would result from condition-mediated decreased reproductive potential. Displacing fishing effort, via time-area closure, can be an effective mitigation strategy in these circumstances. These findings have important implications for current management plans which, for practical consideration, may lead to lower overall pinger prevalence at sea. This study also shows that estimating the reproductive potential of the species should be incorporated in bycatch monitoring programmes. We now need to better understand how physiological condition affect reproductive decisions and behavioural responses to noise in cetaceans to better appraise and estimate the cumulative impacts of bycatch and its mitigations.
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Affiliation(s)
- David Lusseau
- National Institute for Aquatic Resources, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
| | - Lotte Kindt-Larsen
- National Institute for Aquatic Resources, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Floris M van Beest
- Department of Bioscience, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
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4
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Affiliation(s)
- Filipe Alves
- Marine and Environmental Sciences Centre (MARE), Agência Regional para o Desenvolvimento da Investigação, Tecnologia e Inovação, Madeira, Portugal
| | - Massimiliano Rosso
- Centro Internazionale in Monitoraggio Ambientale (CIMA) Research Foundation, 17100 Savona, Italy
| | - Songhai Li
- Marine Mammal and Marine Bioacoustics Laboratory, Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China.,Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China.,Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
| | - Douglas P Nowacek
- Nicholas School of the Environment and Pratt School of Engineering, Duke University Marine Laboratory, Beaufort, NC 28516, USA
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5
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White ER, Schakner Z, Bellamy A, Srinivasan M. Detecting population trends for US marine mammals. CONSERVATION SCIENCE AND PRACTICE 2022. [DOI: 10.1111/csp2.611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Affiliation(s)
- Easton R. White
- Department of Biological Sciences University of New Hampshire Durham New Hampshire USA
- Gund Institute for Environment University of Vermont Burlington Vermont USA
| | - Zachary Schakner
- Office of Science and Technology, National Marine Fisheries Service, National Oceanic and Atmospheric Administration Silver Spring Maryland USA
| | - Amber Bellamy
- Office of Science and Technology, National Marine Fisheries Service, National Oceanic and Atmospheric Administration Silver Spring Maryland USA
| | - Mridula Srinivasan
- Office of Science and Technology, National Marine Fisheries Service, National Oceanic and Atmospheric Administration Silver Spring Maryland USA
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6
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Allman P, Agyekumhene A, Stemle L. Gillnet illumination as an effective measure to reduce sea turtle bycatch. CONSERVATION BIOLOGY : THE JOURNAL OF THE SOCIETY FOR CONSERVATION BIOLOGY 2021; 35:967-975. [PMID: 33000519 DOI: 10.1111/cobi.13647] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 07/16/2020] [Accepted: 09/25/2020] [Indexed: 06/11/2023]
Abstract
The growing demand for fish around the world is an immediate threat to marine megafauna that are unintentionally captured in commercial and artisanal fishery operations. Bycatch mitigation strategies, such as turtle excluder devices, circle hooks, and net illumination, have successfully reduced this risk in some fisheries. We explored the effectiveness of gillnet illumination to reduce sea turtle captures in 2 artisanal fisheries (Mankoadze and Winneba, Ghana) under normal fishing conditions. We first quantified sea turtle bycatch in Ghana's artisanal gillnet fishery from 15 boats for 12 months. We then quantified catch of targeted species and sea turtle bycatch from 20 boats for 15 months (7427 net sets). For 10 of these boats, we placed a Centro Economy green light (1 LED) at each 10-m interval on the net. We also quantified target catch and sea turtle bycatch from 30 boats for 8 months (2250 net sets). In 15 of these boats, a Centro Deluxe green light (3 LEDs) was installed at 15-m intervals. Boats with economy lights and those with deluxe lights both exhibited an 81% decrease in sea turtle captures (W = 1, p < 0.001, n = 20; W = 215, p < 0.001, n = 30, respectively) compared with control boats without lights. Illuminated nets resulted in fewer turtle catches for leatherback (Dermochelys coriacea), olive ridley (Lepidochelys olivacea), and green sea turtles (Chelonia mydas) (p < 0.05 for all species). Target catch (mass) (W = 53, p = 0.853 n = 20; W = 76, p = 0.449, n = 23) and value (W = 50, p = 1, n = 20; W = 69, p = 0.728, = 23) were not different across treatments. Our study affirms net illumination can reduce capture rates of 3 species of sea turtles, including the imperiled leatherback. Gear modification methods can successfully reduce bycatch if they are affordable and have broad applications for multiple species in different fisheries.
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Affiliation(s)
- Phil Allman
- Department of Biological Sciences, Florida Gulf Coast University, 10501 FGCU Boulevard South, Fort Myers, FL, 33965, U.S.A
| | | | - Leyna Stemle
- Department of Marine and Fisheries Science, University of Ghana, Legon, Ghana
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7
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Patel SH, Winton MV, Hatch JM, Haas HL, Saba VS, Fay G, Smolowitz RJ. Projected shifts in loggerhead sea turtle thermal habitat in the Northwest Atlantic Ocean due to climate change. Sci Rep 2021; 11:8850. [PMID: 33893380 PMCID: PMC8065110 DOI: 10.1038/s41598-021-88290-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Accepted: 03/31/2021] [Indexed: 11/24/2022] Open
Abstract
It is well established that sea turtles are vulnerable to atmospheric and oceanographic shifts associated with climate change. However, few studies have formally projected how their seasonal marine habitat may shift in response to warming ocean temperatures. Here we used a high-resolution global climate model and a large satellite tagging dataset to project changes in the future distribution of suitable thermal habitat for loggerheads along the northeastern continental shelf of the United States. Between 2009 and 2018, we deployed 196 satellite tags on loggerheads within the Middle Atlantic Bight (MAB) of the Northwest Atlantic continental shelf region, a seasonal foraging area. Tag location data combined with depth and remotely sensed sea surface temperature (SST) were used to characterize the species’ current thermal range in the MAB. The best-fitting model indicated that the habitat envelope for tagged loggerheads consisted of SST ranging from 11.0° to 29.7 °C and depths between 0 and 105.0 m. The calculated core bathythermal range consisted of SSTs between 15.0° and 28.0 °C and depths between 8.0 and 92.0 m, with the highest probability of presence occurred in regions with SST between 17.7° and 25.3 °C and at depths between 26.1 and 74.2 m. This model was then forced by a high-resolution global climate model under a doubling of atmospheric CO2 to project loggerhead probability of presence over the next 80 years. Our results suggest that loggerhead thermal habitat and seasonal duration will likely increase in northern regions of the NW Atlantic shelf. This change in spatiotemporal range for sea turtles in a region of high anthropogenic use may prompt adjustments to the localized protected species conservation measures.
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Affiliation(s)
- Samir H Patel
- Coonamessett Farm Foundation, 277 Hatchville Road, East Falmouth, MA, 02536, USA.
| | - Megan V Winton
- School for Marine Science and Technology, University of Massachusetts Dartmouth, 836 S Rodney French Blvd, New Bedford, MA, 02744, USA.,Atlantic White Shark Conservancy, 235 Orleans Road, North Chatham, MA, 02650, USA
| | - Joshua M Hatch
- Northeast Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 166 Water Street, Woods Hole, MA, 02543, USA
| | - Heather L Haas
- Northeast Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 166 Water Street, Woods Hole, MA, 02543, USA
| | - Vincent S Saba
- Geophysical Fluid Dynamics Laboratory, Northeast Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Princeton University Forrestal Campus, 201 Forrestal Road, Princeton, NJ, 08544, USA
| | - Gavin Fay
- School for Marine Science and Technology, University of Massachusetts Dartmouth, 836 S Rodney French Blvd, New Bedford, MA, 02744, USA
| | - Ronald J Smolowitz
- Coonamessett Farm Foundation, 277 Hatchville Road, East Falmouth, MA, 02536, USA
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8
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Ferrette BLDS, Domingues RR, Rotundo MM, Miranda MP, Bunholi IV, De Biasi JB, Oliveira C, Foresti F, Mendonça FF. DNA Barcode Reveals the Bycatch of Endangered Batoids Species in the Southwest Atlantic: Implications for Sustainable Fisheries Management and Conservation Efforts. Genes (Basel) 2019; 10:genes10040304. [PMID: 31003471 PMCID: PMC6523448 DOI: 10.3390/genes10040304] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 04/01/2019] [Accepted: 04/01/2019] [Indexed: 01/17/2023] Open
Abstract
Today, elasmobranchs are one the most threatened vertebrate groups worldwide. In fact, at least 90% of elasmobranch species are listed in the International Union for Conservation of Nature (IUCN) Red List, while more than 40% are data-deficient. Although these vertebrates are mainly affected by unsustainable fishery activities, bycatch is also one of the major threats to sharks and batoids worldwide, and represents a challenge for both sustainable fishery management and for biodiversity and conservational efforts. Thus, in this study, DNA barcode methodology was used to identify the bycatch composition of batoid species from small-scale industrial fisheries in the southwest Atlantic and artisanal fisheries from southeast Brazil. A total of 228 individuals belonging to four Chondrichthyes orders, seven families, and at least 17 distinct batoid species were sequenced; among these individuals, 131 belonged to species protected in Brazil, 101 to globally threatened species, and some to species with trade restrictions provided by Appendix II of the Convention on International Trade in Endangered Species (CITES). These results highlight the impacts on marine biodiversity of bycatch by small-scale industrial and unmanaged artisanal fisheries from the southwest Atlantic, and support the implementation of DNA-based methodologies for species-specific identification in data-poor fisheries as a powerful tool for improving the quality of fisheries’ catch statistics and for keeping precise bycatch records.
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Affiliation(s)
- Bruno Lopes da Silva Ferrette
- Laboratório de Genética e Conservação, Universidade Santa Cecília (UNISANTA), Santos 11045-907, Brazil.
- Laboratório de Genética Pesqueira e Conservação (GenPesC), Instituto do Mar, Universidade Federal de São Paulo (UNIFESP), Santos 11070-102, Brazil.
| | - Rodrigo Rodrigues Domingues
- Laboratório de Genética Pesqueira e Conservação (GenPesC), Instituto do Mar, Universidade Federal de São Paulo (UNIFESP), Santos 11070-102, Brazil.
| | - Matheus Marcos Rotundo
- Acervo Zoológico, Universidade Santa Cecília (UNISANTA), Oswaldo Cruz St. 266, Santos 11045-907, Brazil.
| | - Marina Provetti Miranda
- Laboratório de Genética Pesqueira e Conservação (GenPesC), Instituto do Mar, Universidade Federal de São Paulo (UNIFESP), Santos 11070-102, Brazil.
| | - Ingrid Vasconcellos Bunholi
- Laboratório de Genética Pesqueira e Conservação (GenPesC), Instituto do Mar, Universidade Federal de São Paulo (UNIFESP), Santos 11070-102, Brazil.
| | - Juliana Beltramin De Biasi
- Laboratório de Genética Pesqueira e Conservação (GenPesC), Instituto do Mar, Universidade Federal de São Paulo (UNIFESP), Santos 11070-102, Brazil.
| | - Claudio Oliveira
- Laboratório de Biologia e Genética de Peixes (LBGP), Instituto de Biociências de Botucatu (IBB), Universidade Estadual Paulista "Júlio de Mesquita Filho" (UNESP), Botucatu 18618-689, Brazil.
| | - Fausto Foresti
- Laboratório de Biologia e Genética de Peixes (LBGP), Instituto de Biociências de Botucatu (IBB), Universidade Estadual Paulista "Júlio de Mesquita Filho" (UNESP), Botucatu 18618-689, Brazil.
| | - Fernando Fernandes Mendonça
- Laboratório de Genética Pesqueira e Conservação (GenPesC), Instituto do Mar, Universidade Federal de São Paulo (UNIFESP), Santos 11070-102, Brazil.
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9
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Fisheries bycatch risk to marine megafauna is intensified in Lagrangian coherent structures. Proc Natl Acad Sci U S A 2018; 115:7362-7367. [PMID: 29941592 DOI: 10.1073/pnas.1801270115] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Incidental catch of nontarget species (bycatch) is a major barrier to ecological and economic sustainability in marine capture fisheries. Key to mitigating bycatch is an understanding of the habitat requirements of target and nontarget species and the influence of heterogeneity and variability in the dynamic marine environment. While patterns of overlap among marine capture fisheries and habitats of a taxonomically diverse range of marine vertebrates have been reported, a mechanistic understanding of the real-time physical drivers of bycatch events is lacking. Moving from describing patterns toward understanding processes, we apply a Lagrangian analysis to a high-resolution ocean model output to elucidate the fundamental mechanisms that drive fisheries interactions. We find that the likelihood of marine megafauna bycatch is intensified in attracting Lagrangian coherent structures associated with submesoscale and mesoscale filaments, fronts, and eddies. These results highlight how the real-time tracking of dynamic structures in the oceans can support fisheries sustainability and advance ecosystem-based management.
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10
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Hazen EL, Scales KL, Maxwell SM, Briscoe DK, Welch H, Bograd SJ, Bailey H, Benson SR, Eguchi T, Dewar H, Kohin S, Costa DP, Crowder LB, Lewison RL. A dynamic ocean management tool to reduce bycatch and support sustainable fisheries. SCIENCE ADVANCES 2018; 4:eaar3001. [PMID: 29854945 PMCID: PMC5976278 DOI: 10.1126/sciadv.aar3001] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Accepted: 04/18/2018] [Indexed: 05/19/2023]
Abstract
Seafood is an essential source of protein for more than 3 billion people worldwide, yet bycatch of threatened species in capture fisheries remains a major impediment to fisheries sustainability. Management measures designed to reduce bycatch often result in significant economic losses and even fisheries closures. Static spatial management approaches can also be rendered ineffective by environmental variability and climate change, as productive habitats shift and introduce new interactions between human activities and protected species. We introduce a new multispecies and dynamic approach that uses daily satellite data to track ocean features and aligns scales of management, species movement, and fisheries. To accomplish this, we create species distribution models for one target species and three bycatch-sensitive species using both satellite telemetry and fisheries observer data. We then integrate species-specific probabilities of occurrence into a single predictive surface, weighing the contribution of each species by management concern. We find that dynamic closures could be 2 to 10 times smaller than existing static closures while still providing adequate protection of endangered nontarget species. Our results highlight the opportunity to implement near real-time management strategies that would both support economically viable fisheries and meet mandated conservation objectives in the face of changing ocean conditions. With recent advances in eco-informatics, dynamic management provides a new climate-ready approach to support sustainable fisheries.
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Affiliation(s)
- Elliott L. Hazen
- National Oceanic and Atmospheric Administration, Southwest Fisheries Science Center, Monterey, CA 93940, USA
- Institute of Marine Sciences, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
- Woods Institute Visiting Scholar, Stanford University, 473 Via Ortega, Stanford, CA 94035, USA
- Corresponding author.
| | - Kylie L. Scales
- Institute of Marine Sciences, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
- University of the Sunshine Coast, School of Science and Engineering, Maroochydore, Queensland, Australia
| | - Sara M. Maxwell
- Department of Biological Sciences, Old Dominion University, Norfolk, VA 23529, USA
| | - Dana K. Briscoe
- Institute of Marine Sciences, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Heather Welch
- Institute of Marine Sciences, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Steven J. Bograd
- National Oceanic and Atmospheric Administration, Southwest Fisheries Science Center, Monterey, CA 93940, USA
- Institute of Marine Sciences, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Helen Bailey
- Chesapeake Biological Laboratory, University of Maryland, Solomons, MD 20688, USA
| | - Scott R. Benson
- National Oceanic and Atmospheric Administration, Southwest Fisheries Science Center, Monterey, CA 93940, USA
- Moss Landing Marine Laboratories, Moss Landing, CA 95039, USA
| | - Tomo Eguchi
- National Oceanic and Atmospheric Administration, Southwest Fisheries Science Center, Monterey, CA 93940, USA
| | - Heidi Dewar
- National Oceanic and Atmospheric Administration, Southwest Fisheries Science Center, Monterey, CA 93940, USA
| | - Suzy Kohin
- National Oceanic and Atmospheric Administration, Southwest Fisheries Science Center, Monterey, CA 93940, USA
| | - Daniel P. Costa
- Institute of Marine Sciences, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Larry B. Crowder
- Stanford University, Hopkins Marine Station, Pacific Grove, CA 93950, USA
| | - Rebecca L. Lewison
- Institute for Ecological Monitoring and Management, San Diego State University, San Diego, CA 92182, USA
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11
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Using temporally explicit habitat suitability models to assess threats to mobile species and evaluate the effectiveness of marine protected areas. J Nat Conserv 2018. [DOI: 10.1016/j.jnc.2017.12.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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12
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Rees AF, Alfaro-Shigueto J, Barata PCR, Bjorndal KA, Bolten AB, Bourjea J, Broderick AC, Campbell LM, Cardona L, Carreras C, Casale P, Ceriani SA, Dutton PH, Eguchi T, Formia A, Fuentes MMPB, Fuller WJ, Girondot M, Godfrey MH, Hamann M, Hart KM, Hays GC, Hochscheid S, Kaska Y, Jensen MP, Mangel JC, Mortimer JA, Naro-Maciel E, Ng CKY, Nichols WJ, Phillott AD, Reina RD, Revuelta O, Schofield G, Seminoff JA, Shanker K, Tomás J, van de Merwe JP, Van Houtan KS, Vander Zanden HB, Wallace BP, Wedemeyer-Strombel KR, Work TM, Godley BJ. Are we working towards global research priorities for management and conservation of sea turtles? ENDANGER SPECIES RES 2016. [DOI: 10.3354/esr00801] [Citation(s) in RCA: 175] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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13
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Lopes K, Passos L, Rodrigues JG, Koenen F, Stiebens V, Székely T, Dutra A. Sea Turtle, Shark, and Dolphin Bycatch Rates by Artisanal and Semi-Industrial Fishers in Maio Island, Cape Verde. CHELONIAN CONSERVATION AND BIOLOGY 2016. [DOI: 10.2744/cb-1213.1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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14
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Peckham SH, Lucero-Romero J, Maldonado-Díaz D, Rodríguez-Sánchez A, Senko J, Wojakowski M, Gaos A. Buoyless Nets Reduce Sea Turtle Bycatch in Coastal Net Fisheries. Conserv Lett 2015. [DOI: 10.1111/conl.12176] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Affiliation(s)
- S. Hoyt Peckham
- Center for Ocean Solutions; Stanford University; Pacific Grove CA USA
| | - Jesus Lucero-Romero
- Grupo Tortuguero de las Californias; A.C; La Paz, Baja California Sur México
| | | | | | - Jesse Senko
- School of Life Sciences; Arizona State University; Tempe AZ USA
| | | | - Alexander Gaos
- Eastern Pacific Hawksbill Initiative; San Diego CA USA
- San Diego State University; San Diego CA USA
- University of California Davis; Davis CA USA
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15
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Bostwick A, Higgins BM, Landry AM, McCracken ML. Novel Use of a Shark Model to Elicit Innate Behavioral Responses in Sea Turtles: Application to Bycatch Reduction in Commercial Fisheries. CHELONIAN CONSERVATION AND BIOLOGY 2014. [DOI: 10.2744/ccb-1110.1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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16
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White ER, Nagy JD, Gruber SH. Modeling the population dynamics of lemon sharks. Biol Direct 2014; 9:23. [PMID: 25403640 PMCID: PMC4289248 DOI: 10.1186/1745-6150-9-23] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Accepted: 10/27/2014] [Indexed: 11/10/2022] Open
Abstract
Background Long-lived marine megavertebrates (e.g. sharks, turtles, mammals, and seabirds) are inherently vulnerable to anthropogenic mortality. Although some mathematical models have been applied successfully to manage these animals, more detailed treatments are often needed to assess potential drivers of population dynamics. In particular, factors such as age-structure, density-dependent feedbacks on reproduction, and demographic stochasticity are important for understanding population trends, but are often difficult to assess. Lemon sharks (Negaprion brevirostris) have a pelagic adult phase that makes them logistically difficult to study. However, juveniles use coastal nursery areas where their densities can be high. Results We use a stage-structured, Markov-chain stochastic model to describe lemon shark population dynamics from a 17-year longitudinal dataset at a coastal nursery area at Bimini, Bahamas. We found that the interaction between delayed breeding, density-dependence, and demographic stochasticity accounts for 33 to 49% of the variance in population size. Conclusions Demographic stochasticity contributed all random effects in this model, suggesting that the existence of unmodeled environmental factors may be driving the majority of interannual population fluctuations. In addition, we are able to use our model to estimate the natural mortality rate of older age classes of lemon sharks that are difficult to study. Further, we use our model to examine what effect the length of a time series plays on deciphering ecological patterns. We find that—even with a relatively long time series—our sampling still misses important rare events. Our approach can be used more broadly to infer population dynamics of other large vertebrates in which age structure and demographic stochasticity are important. Reviewers This article was reviewed by Yang Kuang, Christine Jacob, and Ollivier Hyrien.
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Affiliation(s)
- Easton R White
- School of Life Sciences, Arizona State University, P,O, Box 874501, 85287 Tempe, USA.
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