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Hall AJ, Kershaw JL, Fraser S, Davidson K, Rowland-Pilgrim S, Turner AD, McConnell B. Estimating the risks of exposure to harmful algal toxins among Scottish harbour seals. HARMFUL ALGAE 2024; 136:102653. [PMID: 38876527 DOI: 10.1016/j.hal.2024.102653] [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: 02/21/2024] [Revised: 05/20/2024] [Accepted: 05/20/2024] [Indexed: 06/16/2024]
Abstract
Harmful algal bloom (HAB) toxins consumed by marine predators through fish prey can be lethal but studies on the resulting population consequences are lacking. Over the past approximately 20 years there have been large regional declines in some harbour seal populations around Scotland. Analyses of excreta (faeces and urine from live and dead seals and faecal samples from seal haulout sites) suggest widespread exposure to toxins through the ingestion of contaminated prey. A risk assessment model, incorporating concentrations of the two major HAB toxins found in seal prey around Scotland (domoic acid (DA), and saxitoxins (STX)), the seasonal persistence of the toxins in the fish and the foraging patterns of harbour seals were used to estimate the proportion of adults and juveniles likely to have ingested doses above various estimated toxicity thresholds. The results were highly dependent on toxin type, persistence, and foraging regime as well as age class, all of which affected the proportion of exposed animals exceeding toxicity thresholds. In this preliminary model STX exposure was unlikely to result in mortalities. Modelled DA exposure resulted in doses above an estimated lethal threshold of 1900 µg/kg body mass affecting up to 3.8 % of exposed juveniles and 5.3 % of exposed adults. Given the uncertainty in the model parameters and the limitations of the data these conclusions should be treated with caution, but they indicate that DA remains a potential factor involved in the regional declines of harbour seals. Similar risks may be experienced by other top predators, including small cetaceans and seabirds that feed on similar prey in Scottish waters.
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Affiliation(s)
- Ailsa J Hall
- Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St Andrews, UK, KY16 8LB.
| | - Joanna L Kershaw
- Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St Andrews, UK, KY16 8LB
| | - Shaun Fraser
- UHI Shetland, University of the Highlands and Islands, Port Arthur, Scalloway, Shetland, UK, ZE1 0UN
| | - Keith Davidson
- Scottish Association for Marine Science, Oban, UK, PA37 1QA
| | - Stephanie Rowland-Pilgrim
- Food Safety Group, Centre for Environment and Fisheries Science (Cefas), Weymouth, Dorset, UK, DT4 8UB
| | - Andrew D Turner
- Food Safety Group, Centre for Environment and Fisheries Science (Cefas), Weymouth, Dorset, UK, DT4 8UB
| | - Bernie McConnell
- Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St Andrews, UK, KY16 8LB
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Gonzales-Viera O, Goldstein T, Duignan P, Eiamcharoen P, Keel MK. California sea lion ( Zalophus californianus) lymph-node explant reveals involvement and possible transcriptional regulation of SLAM and nectin-4 during phocine distemper virus infection. Vet Pathol 2024; 61:125-134. [PMID: 37458158 DOI: 10.1177/03009858231186189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/18/2023]
Abstract
Phocine distemper virus (PDV) is a significant cause of mortality for phocid seals; however, the susceptibility of otariids to this virus is poorly understood. The authors used a lymph-node explant culture system from California sea lions (Zalophus californianus, CSL) to investigate: (1) the role of signaling lymphocyte activation molecule (SLAM) and nectin-4 in PDV infection and their cellular expression patterns, (2) if PDV induces transcriptional regulation of cell-entry receptors, and (3) the involvement of apoptosis in PDV infection. PDV replicated in the lymph-node explants with peak replication 3 days post-infection (dpi), but the replication was not sustained 4 to 5 dpi. The PDV+ cells co-localized SLAM and nectin-4. These cells expressed IBA1, indicating a histiocytic lineage. Comparison of receptor expression between infected and mock-infected lymph nodes suggested transcriptional downregulation of both receptors during the initial stage of infection and upregulation during the late stage of infection, but the values lack of statistical significance. Cleaved caspase-3+ cells were slightly increased in the infected lymph nodes compared with the mock-infected lymph node from 1 to 4 dpi, but without statistical significance, and a few apoptotic cells co-expressed PDV. The results suggest that lymph-node explants might be an important model to study PDV pathogenesis. CSLs have the potential to be infected with PDV, as they express both cell-entry receptors in histiocytes. The lack of statistical significance in the PDV replication, transcriptional regulation of viral receptors, and changes in apoptosis suggest that although CSL might be infected by PDV, they might be less susceptible than phocid species.
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Vigil K, Aw TG. Comparison of de novo assembly using long-read shotgun metagenomic sequencing of viruses in fecal and serum samples from marine mammals. Front Microbiol 2023; 14:1248323. [PMID: 37808316 PMCID: PMC10556685 DOI: 10.3389/fmicb.2023.1248323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 09/04/2023] [Indexed: 10/10/2023] Open
Abstract
Introduction Viral diseases of marine mammals are difficult to study, and this has led to a limited knowledge on emerging known and unknown viruses which are ongoing threats to animal health. Viruses are the leading cause of infectious disease-induced mass mortality events among marine mammals. Methods In this study, we performed viral metagenomics in stool and serum samples from California sea lions (Zalophus californianus) and bottlenose dolphins (Tursiops truncates) using long-read nanopore sequencing. Two widely used long-read de novo assemblers, Canu and Metaflye, were evaluated to assemble viral metagenomic sequencing reads from marine mammals. Results Both Metaflye and Canu assembled similar viral contigs of vertebrates, such as Parvoviridae, and Poxviridae. Metaflye assembled viral contigs that aligned with one viral family that was not reproduced by Canu, while Canu assembled viral contigs that aligned with seven viral families that was not reproduced by Metaflye. Only Canu assembled viral contigs from dolphin and sea lion fecal samples that matched both protein and nucleotide RefSeq viral databases using BLASTx and BLASTn for Anelloviridae, Parvoviridae and Circoviridae families. Viral contigs assembled with Canu aligned with torque teno viruses and anelloviruses from vertebrate hosts. Viruses associated with invertebrate hosts including densoviruses, Ambidensovirus, and various Circoviridae isolates were also aligned. Some of the invertebrate and vertebrate viruses reported here are known to potentially cause mortality events and/or disease in different seals, sea stars, fish, and bivalve species. Discussion Canu performed better by producing the most viral contigs as compared to Metaflye with assemblies aligning to both protein and nucleotide databases. This study suggests that marine mammals can be used as important sentinels to surveil marine viruses that can potentially cause diseases in vertebrate and invertebrate hosts.
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Affiliation(s)
| | - Tiong Gim Aw
- Department of Environmental Health Sciences, School of Public Health and Tropical Medicine, Tulane University, New Orleans, LA, United States
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Banerjee S, Maity S, Guchhait R, Chatterjee A, Biswas C, Adhikari M, Pramanick K. Toxic effects of cyanotoxins in teleost fish: A comprehensive review. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2021; 240:105971. [PMID: 34560410 DOI: 10.1016/j.aquatox.2021.105971] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 09/03/2021] [Accepted: 09/13/2021] [Indexed: 06/13/2023]
Abstract
The phenomenon of eutrophication leads to the global occurrence of algal blooms. Cyanotoxins as produced by many cyanobacterial species can lead to detrimental effects to the biome due to their stability and potential biomagnification along food webs. Therefore, understanding of the potential risks these toxins pose to the most susceptible organisms is an important prerequisite for ecological risks assessment of cyanobacteria blooms. Fishes are an important component of aquatic ecosystems that are prone to direct exposure to cyanotoxins. However, relatively few investigations have focused on measuring the toxic potentials of cyanotoxins in teleost fishes. This review comprehensively describes the major toxicological impacts (such as hepatotoxicity, neurotoxicity, immune toxicity, reproductive toxicity and cytogenotoxicity) of commonly occurring cyanotoxins in teleost fishes. The present work encompasses recent research progresses with special emphasis on the basic molecular mechanisms by which different cyanotoxins impose their toxicities in teleost fishes. The major research areas, which need to be focused on in future scientific investigations, have also been highlighted. Protein kinase inhibition, transcriptional dysregulation, disruption of redox homeostasis and the induction of apoptotic pathways appear to be the key drivers of the toxicological effects of cyanotoxins in fish. Analyses also showed that the impacts of cyanotoxins on specific reproductive processes are relatively less described in teleosts in comparison to mammalian systems. In fact, as compared to other toxicological effects of cyanotoxins, their reproductive toxicity (such as impacts on oocyte development, maturation and their hormonal regulation) is poorly understood in fish, and thus requires further studies. Furthermore, additonal studies characterizing the molecular mechanisms responsible for the cellular uptake of cyanotoxins need to be investigated.
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Affiliation(s)
- Sambuddha Banerjee
- Integrative Biology Research Unit, Department of Life Sciences, Presidency University, 86/1, College Street, Kolkata 700073, India
| | - Sukhendu Maity
- Integrative Biology Research Unit, Department of Life Sciences, Presidency University, 86/1, College Street, Kolkata 700073, India
| | - Rajkumar Guchhait
- P.G. Department of Zoology, Mahishadal Raj College, Garkamalpur, Purba Medinipur, India
| | - Ankit Chatterjee
- Integrative Biology Research Unit, Department of Life Sciences, Presidency University, 86/1, College Street, Kolkata 700073, India
| | - Chayan Biswas
- Integrative Biology Research Unit, Department of Life Sciences, Presidency University, 86/1, College Street, Kolkata 700073, India
| | - Madhuchhanda Adhikari
- Integrative Biology Research Unit, Department of Life Sciences, Presidency University, 86/1, College Street, Kolkata 700073, India
| | - Kousik Pramanick
- Integrative Biology Research Unit, Department of Life Sciences, Presidency University, 86/1, College Street, Kolkata 700073, India.
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Dusek RJ, Smith MM, Van Hemert C, Shearn-Bochsler VI, Hall S, Ridge CD, Hardison DR, Kaler RSA, Bodenstein BL, Hofmeister EK, Hall JS. Acute oral toxicity and tissue residues of saxitoxin in the mallard (Anas platyrhynchos). HARMFUL ALGAE 2021; 109:102109. [PMID: 34815022 DOI: 10.1016/j.hal.2021.102109] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 09/16/2021] [Accepted: 09/20/2021] [Indexed: 06/13/2023]
Abstract
Since 2014, widespread, annual mortality events involving multiple species of seabirds have occurred in the Gulf of Alaska, Bering Sea, and Chukchi Sea. Among these die-offs, emaciation was a common finding with starvation often identified as the cause of death. However, saxitoxin (STX) was detected in many carcasses, indicating exposure of these seabirds to STX in the marine environment. Few data are available that describe the effects of STX in birds, thus presenting challenges for determining its contributions to specific mortality events. To address these knowledge gaps, we conducted an acute oral toxicity trial in mallards (Anas platyrhynchos), a common laboratory avian model, using an up-and-down method to estimate the median lethal dose (LD50) for STX. Using an enzyme-linked immunosorbent assay (ELISA), we tested select tissues from all birds and feces from those individuals that survived initial dosing. Samples with an ELISA result that exceeded approximately 10 µg 100 g-1 STX and randomly selected ELISA negative samples were further tested by high-performance liquid chromatography (HPLC). Tissues collected from mallards were also examined grossly at necropsy and then later by microscopy to identify lesions attributable to STX. The estimated LD50 was 167 µg kg-1 (95% CI = 69-275 µg kg-1). Saxitoxin was detected in fecal samples of all mallards tested for up to 48 h after dosing and at the end of the sampling period (7 d) in three birds. In those individuals that died or were euthanized <2 h after dosing, STX was readily detected throughout the gastrointestinal tract but only infrequently in heart, kidney, liver, lung, and breast muscle. No gross or microscopic lesions were observed that could be attributable to STX exposure. Given its acute toxicity, limited detectability, and frequent occurrence in the Alaska marine environment, additional research on STX in seabirds is warranted.
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Affiliation(s)
- Robert J Dusek
- U.S. Geological Survey, National Wildlife Health Center, 6006 Schroeder Road, Madison, WI 53711, United States.
| | - Matthew M Smith
- U.S. Geological Survey, Alaska Science Center, 4210 University Drive, Anchorage, AK 99508, United States.
| | - Caroline Van Hemert
- U.S. Geological Survey, Alaska Science Center, 4210 University Drive, Anchorage, AK 99508, United States.
| | - Valerie I Shearn-Bochsler
- U.S. Geological Survey, National Wildlife Health Center, 6006 Schroeder Road, Madison, WI 53711, United States.
| | - Sherwood Hall
- U.S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, 5001 Campus Drive, College Park, MD 20740, United States.
| | - Clark D Ridge
- U.S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, 5001 Campus Drive, College Park, MD 20740, United States.
| | - D Ransom Hardison
- National Oceanic and Atmospheric Administration, National Centers for Coastal Ocean Science, 101 Pivers Island Road, Beaufort, NC 28516, United States.
| | - Robb S A Kaler
- U.S. Fish and Wildlife Service, Division of Migratory Bird Management, 1011 East Tudor Road, Anchorage, AK 99503, United States.
| | - Barbara L Bodenstein
- U.S. Geological Survey, National Wildlife Health Center, 6006 Schroeder Road, Madison, WI 53711, United States.
| | - Erik K Hofmeister
- U.S. Geological Survey, National Wildlife Health Center, 6006 Schroeder Road, Madison, WI 53711, United States.
| | - Jeffrey S Hall
- U.S. Geological Survey, National Wildlife Health Center, 6006 Schroeder Road, Madison, WI 53711, United States.
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Fire SE, Bogomolni A, DiGiovanni RA, Early G, Leighfield TA, Matassa K, Miller GA, Moore KMT, Moore M, Niemeyer M, Pugliares K, Wang Z, Wenzel FW. An assessment of temporal, spatial and taxonomic trends in harmful algal toxin exposure in stranded marine mammals from the U.S. New England coast. PLoS One 2021; 16:e0243570. [PMID: 33406141 PMCID: PMC7787384 DOI: 10.1371/journal.pone.0243570] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Accepted: 11/23/2020] [Indexed: 01/31/2023] Open
Abstract
Despite a long-documented history of severe harmful algal blooms (HABs) in New England coastal waters, corresponding HAB-associated marine mammal mortality events in this region are far less frequent or severe relative to other regions where HABs are common. This long-term survey of the HAB toxins saxitoxin (STX) and domoic acid (DA) demonstrates significant and widespread exposure of these toxins in New England marine mammals, across multiple geographic, temporal and taxonomic groups. Overall, 19% of the 458 animals tested positive for one or more toxins, with 15% and 7% testing positive for STX and DA, respectively. 74% of the 23 different species analyzed demonstrated evidence of toxin exposure. STX was most prevalent in Maine coastal waters, most frequently detected in common dolphins (Delphinus delphis), and most often detected during July and October. DA was most prevalent in animals sampled in offshore locations and in bycaught animals, and most frequently detected in mysticetes, with humpback whales (Megaptera novaeangliae) testing positive at the highest rates. Feces and urine appeared to be the sample matrices most useful for determining the presence of toxins in an exposed animal, with feces samples having the highest concentrations of STX or DA. No relationship was found between the bloom season of toxin-producing phytoplankton and toxin detection rates, however STX was more likely to be present in July and October. No relationship between marine mammal dietary preference and frequency of toxin detection was observed. These findings are an important part of a framework for assessing future marine mammal morbidity and mortality events, as well as monitoring ecosystem health using marine mammals as sentinel organisms for predicting coastal ocean changes.
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Affiliation(s)
- Spencer E. Fire
- Florida Institute of Technology, Melbourne, FL, United States of America
- * E-mail:
| | - Andrea Bogomolni
- Massachusetts Maritime Academy, Buzzards Bay, Massachusetts, United States of America
| | - Robert A. DiGiovanni
- Atlantic Marine Conservation Society, Hampton Bays, New York, United States of America
| | - Greg Early
- Integrated Statistics, Woods Hole, Massachusetts, United States of America
| | - Tod A. Leighfield
- National Oceanic and Atmospheric Administration, National Ocean Service, Charleston, South Carolina, United States of America
| | - Keith Matassa
- Ocean Animal Response and Research Alliance, Laguna Niguel, California, United States of America
| | - Glenn A. Miller
- Florida Institute of Technology, Melbourne, FL, United States of America
| | - Kathleen M. T. Moore
- International Fund for Animal Welfare, Yarmouth Port, Massachusetts, United States of America
| | - Michael Moore
- Biology Department, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, United States of America
| | - Misty Niemeyer
- International Fund for Animal Welfare, Yarmouth Port, Massachusetts, United States of America
| | - Katie Pugliares
- New England Aquarium, Boston, Massachusetts, United States of America
| | - Zhihong Wang
- CSS Corporation, Fairfax, VA, United States of America
- Under Contract to National Ocean Service, Charleston, South Carolina, United States of America
| | - Frederick W. Wenzel
- National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Woods Hole, Massachusetts, United States of America
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Levin M, Jasperse L, Desforges JP, O'Hara T, Rea L, Castellini JM, Maniscalco JM, Fadely B, Keogh M. Methyl mercury (MeHg) in vitro exposure alters mitogen-induced lymphocyte proliferation and cytokine expression in Steller sea lion (Eumetopias jubatus) pups. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 725:138308. [PMID: 32302832 DOI: 10.1016/j.scitotenv.2020.138308] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Revised: 03/23/2020] [Accepted: 03/28/2020] [Indexed: 06/11/2023]
Abstract
Steller sea lions (Eumetopias jubatus, SSLs) are managed as two distinct population segments within U.S. waters: the endangered western distinct population segment and the recently delisted eastern distinct population segment. Recent studies reported concentrations of mercury in several tissues collected from young SSLs in the Aleutian Islands that were at or above concentrations found to negatively impact health in other fish-eating mammals. However, there are limited studies which have investigated the range of mercury concentrations that may negatively influence the SSL immune system. This study assessed relationships between methyl mercury (MeHg+) concentrations and two immune functions, lymphocyte proliferation and cytokine expression. Peripheral blood mononuclear cells (PBMCs) were isolated and cryopreserved from pups on three rookeries within the western distinct population segment: Chiswell Island, Ulak, and Agattu Islands. Lymphocyte proliferation and cytokine expression were assessed in vitro using thawed PBMCs with exposure to MeHg+ (unexposed control, 0.001, 0.01, and 0.1 μg/ml). Lymphocyte proliferation was measured without and with stimulation with a T cell mitogen (ConA) and B cell mitogen (LPS) and the concentration of cytokines was measured in the cell culture supernatant (with and without ConA or LPS). Spontaneous lymphocyte proliferation was significantly increased at 0.01 and 0.1 μg/ml. T lymphocyte proliferation was significantly increased at 0.001 μg/ml and 0.1 μg/ml, while B lymphocyte proliferation was decreased at 0.1 μg/ml. Cytokine concentrations for INFγ, IL-10, IL-6, and TNFα were reduced at 0.1 μg/ml upon either T or B cell mitogen stimulation, with the exception for IL-10, where 0.1 μg/ml reduced IL-10 concentration compared to unstimulated cells. These data suggest immune functions were affected by MeHg+ exposure requiring in vivo follow up investigations. The observed modulation of immune functions is of concern as any toxicant-induced modulation may adversely affect the health of individuals, particularly younger animals undergoing periods of critical development.
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Affiliation(s)
- Milton Levin
- University of Connecticut, Department of Pathobiology and Veterinary Science, 61 N. Eagleville Road U-3089, Storrs, CT 06269, United States of America.
| | - Lindsay Jasperse
- University of Connecticut, Department of Pathobiology and Veterinary Science, 61 N. Eagleville Road U-3089, Storrs, CT 06269, United States of America
| | - Jean-Pierre Desforges
- Department of Bioscience, Arctic Research Centre, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
| | - Todd O'Hara
- Department of Veterinary Medicine, University of Alaska Fairbanks, Fairbanks, AK 99775-5910, United States of America; Veterinary Integrative Biosciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, 4458 TAMU, College Station, TX 77843, United States of America
| | - Lorrie Rea
- Institute of Northern Engineering, University of Alaska Fairbanks, Fairbanks, AK 99775-5910, United States of America
| | - J Margaret Castellini
- Department of Veterinary Medicine, University of Alaska Fairbanks, Fairbanks, AK 99775-5910, United States of America
| | - John M Maniscalco
- Alaska SeaLife Center, P.O. Box 1329, Seward, AK 99664, United States of America
| | - Brian Fadely
- Marine Mammal Laboratory, Alaska Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 7600 Sand Point Way NE, Seattle, WA 98115, United States of America
| | - Mandy Keogh
- Alaska Department of Fish and Game, Marine Mammal Program. 1300 College Rd., Fairbanks, AK 99701, United States of America
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Boroda AV. Marine mammal cell cultures: To obtain, to apply, and to preserve. MARINE ENVIRONMENTAL RESEARCH 2017; 129:316-328. [PMID: 28683932 DOI: 10.1016/j.marenvres.2017.06.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Revised: 06/28/2017] [Accepted: 06/28/2017] [Indexed: 06/07/2023]
Abstract
The world's oceans today have become a place for the disposal of toxic waste, which leads to the degradation of marine mammal habitats and populations. Marine mammal cell cultures have proven to be a multifunctional tool for studying the peculiarities of the cell physiology and biochemistry of these animals as well as the destructive effects of anthropogenic and natural toxicants. This review describes the sources of marine mammal live tissues and the methods required for establishing cell cultures, their use, and long-term storage. Approaches to conserving rare animal species by applying cell biology methodologies are also discussed.
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Affiliation(s)
- A V Boroda
- A.V. Zhirmunsky Institute of Marine Biology, National Scientific Center of Marine Biology, Far Eastern Branch of the Russian Academy of Sciences, 17 Palchevsky St., Vladivostok, 690041, Russia.
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