1
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Fernandez A, Jepson PD, Diaz-Delgado J, de Quiros YB, Sierra E, Mompeo B, Vela AI, Di Guardo G, Suarez-Santana C, de Los Monteros AE, Herraez P, Andrada M, Caballero MJ, Rivero M, Consoli F, Castro-Alonso A, Quesada-Canales O, Arbelo M. Budd-Chiari-like pathology in dolphins. Sci Rep 2022; 12:12635. [PMID: 35879404 PMCID: PMC9314369 DOI: 10.1038/s41598-022-16947-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 07/19/2022] [Indexed: 11/24/2022] Open
Abstract
Nearly two decades ago, pathologic examination results suggested that acoustic factors, such as mid-frequency active naval military sonar (MFAS) could be the cause of acute decompression-like sickness in stranded beaked whales. Acute systemic gas embolism in these whales was reported together with enigmatic cystic liver lesions (CLL), characterized by intrahepatic encapsulated gas-filled cysts, tentatively interpreted as “gas-bubble” lesions in various other cetacean species. Here we provide a pathologic reinterpretation of CLL in odontocetes. Among 1,200 cetaceans necropsied, CLL were only observed in four striped dolphins (Stenella coeruleoalba), with a low prevalence (2%, N = 179). Together, our data strongly suggest that CLL are the result of the combination of a pre-existing or concomitant hepatic vascular disorder superimposed and exacerbated by gas bubbles, and clearly differ from acute systemic gas embolism in stranded beaked whales that is linked to MFAS. Budd-Chiari-like syndrome in dolphins is hypothesized based on the present pathologic findings. Nonetheless, further researched is warranted to determine precise etiopathogenesis(es) and contributing factors for CLL in cetaceans.
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Affiliation(s)
- Antonio Fernandez
- Veterinary Histology and Pathology, Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School, C/ Transmontaña s/n, Arucas, 35416, Las Palmas, Spain.
| | - Paul D Jepson
- Veterinary Histology and Pathology, Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School, C/ Transmontaña s/n, Arucas, 35416, Las Palmas, Spain.,Institute of Zoology, London, UK
| | - Josue Diaz-Delgado
- Veterinary Histology and Pathology, Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School, C/ Transmontaña s/n, Arucas, 35416, Las Palmas, Spain
| | - Yara Bernaldo de Quiros
- Veterinary Histology and Pathology, Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School, C/ Transmontaña s/n, Arucas, 35416, Las Palmas, Spain
| | - Eva Sierra
- Veterinary Histology and Pathology, Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School, C/ Transmontaña s/n, Arucas, 35416, Las Palmas, Spain
| | - Blanca Mompeo
- Veterinary Histology and Pathology, Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School, C/ Transmontaña s/n, Arucas, 35416, Las Palmas, Spain.,Human Medicine School, University Las Palmas de Gran Canaria, Las Palmas, Spain
| | | | - Giovanni Di Guardo
- Veterinary Histology and Pathology, Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School, C/ Transmontaña s/n, Arucas, 35416, Las Palmas, Spain.,Veterinary School, Teramo University, Teramo, Italy
| | - Cristian Suarez-Santana
- Veterinary Histology and Pathology, Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School, C/ Transmontaña s/n, Arucas, 35416, Las Palmas, Spain
| | - Antonio Espinosa de Los Monteros
- Veterinary Histology and Pathology, Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School, C/ Transmontaña s/n, Arucas, 35416, Las Palmas, Spain
| | - Pedro Herraez
- Veterinary Histology and Pathology, Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School, C/ Transmontaña s/n, Arucas, 35416, Las Palmas, Spain
| | - Marisa Andrada
- Veterinary Histology and Pathology, Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School, C/ Transmontaña s/n, Arucas, 35416, Las Palmas, Spain
| | - Maria Jose Caballero
- Veterinary Histology and Pathology, Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School, C/ Transmontaña s/n, Arucas, 35416, Las Palmas, Spain
| | - Miguel Rivero
- Veterinary Histology and Pathology, Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School, C/ Transmontaña s/n, Arucas, 35416, Las Palmas, Spain
| | - Francesco Consoli
- Veterinary Histology and Pathology, Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School, C/ Transmontaña s/n, Arucas, 35416, Las Palmas, Spain
| | - Ayoze Castro-Alonso
- Veterinary Histology and Pathology, Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School, C/ Transmontaña s/n, Arucas, 35416, Las Palmas, Spain.,Canary Islands Oceanic Platform (Plocan), Canary Islands, Spain
| | - Oscar Quesada-Canales
- Veterinary Histology and Pathology, Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School, C/ Transmontaña s/n, Arucas, 35416, Las Palmas, Spain
| | - Manuel Arbelo
- Veterinary Histology and Pathology, Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School, C/ Transmontaña s/n, Arucas, 35416, Las Palmas, Spain
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2
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Velázquez-Wallraf A, Fernández A, Caballero MJ, Arregui M, González Díaz Ó, Betancor MB, Bernaldo de Quirós Y. Establishment of a fish model to study gas-bubble lesions. Sci Rep 2022; 12:6592. [PMID: 35449183 PMCID: PMC9023494 DOI: 10.1038/s41598-022-10539-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 04/01/2022] [Indexed: 11/08/2022] Open
Abstract
Decompression sickness (DCS) is a clinical syndrome caused by the formation of systemic intravascular and extravascular gas bubbles. The presence of these bubbles in blood vessels is known as gas embolism. DCS has been described in humans and animals such as sea turtles and cetaceans. To delve deeper into DCS, experimental models in terrestrial mammals subjected to compression/decompression in a hyperbaric chamber have been used. Fish can suffer from gas bubble disease (GBD), characterized by the formation of intravascular and extravascular systemic gas bubbles, similarly to that observed in DCS. Given these similarities and the fact that fish develop this disease naturally in supersaturated water, they could be used as an alternative experimental model for the study of the pathophysiological aspect of gas bubbles. The objective of this study was to obtain a reproducible model for GBD in fish by an engineering system and a complete pathological study, validating this model for the study of the physiopathology of gas related lesions in DCS. A massive and severe GBD was achieved by exposing the fish for 18 h to TDG values of 162-163%, characterized by the presence of severe hemorrhages and the visualization of massive quantities of macroscopic and microscopic gas bubbles, systemically distributed, circulating through different large vessels of experimental fish. These pathological findings were the same as those described in small mammals for the study of explosive DCS by hyperbaric chamber, validating the translational usefulness of this first fish model to study the gas-bubbles lesions associated to DCS from a pathological standpoint.
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Affiliation(s)
- Alicia Velázquez-Wallraf
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria (ULPGC), Canary Islands, Spain
| | - Antonio Fernández
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria (ULPGC), Canary Islands, Spain
| | - María José Caballero
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria (ULPGC), Canary Islands, Spain.
| | - Marina Arregui
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria (ULPGC), Canary Islands, Spain
| | - Óscar González Díaz
- Physical and Chemical Instrumental Center for the Development of Applied Research Technology and Scientific Estate, Institute for Environmental Studies and Natural Resources (I-UNAT), University of Las Palmas de Gran Canaria (ULPGC), Las Palmas, Spain
| | - Mónica B Betancor
- Institute of Aquaculture, Faculty of Natural Sciences, University of Stirling, Stirling, UK
| | - Yara Bernaldo de Quirós
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria (ULPGC), Canary Islands, Spain
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA
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3
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Velázquez-Wallraf A, Fernández A, Caballero MJ, Møllerløkken A, Jepson PD, Andrada M, Bernaldo de Quirós Y. Decompressive Pathology in Cetaceans Based on an Experimental Pathological Model. Front Vet Sci 2021; 8:676499. [PMID: 34169109 PMCID: PMC8218990 DOI: 10.3389/fvets.2021.676499] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Accepted: 04/26/2021] [Indexed: 11/26/2022] Open
Abstract
Decompression sickness (DCS) is a widely known clinical syndrome in human medicine, mainly in divers, related to the formation of intravascular and extravascular gas bubbles. Gas embolism and decompression-like sickness have also been described in wild animals, such as cetaceans. It was hypothesized that adaptations to the marine environment protected them from DCS, but in 2003, decompression-like sickness was described for the first time in beaked whales, challenging this dogma. Since then, several episodes of mass strandings of beaked whales coincidental in time and space with naval maneuvers have been recorded and diagnosed with DCS. The diagnosis of human DCS is based on the presence of clinical symptoms and the detection of gas embolism by ultrasound, but in cetaceans, the diagnosis is limited to forensic investigations. For this reason, it is necessary to resort to experimental animal models to support the pathological diagnosis of DCS in cetaceans. The objective of this study is to validate the pathological results of cetaceans through an experimental rabbit model wherein a complete and detailed histopathological analysis was performed. Gross and histopathological results were very similar in the experimental animal model compared to stranded cetaceans with DCS, with the presence of gas embolism systemically distributed as well as emphysema and hemorrhages as primary lesions in different organs. The experimental data reinforces the pathological findings found in cetaceans with DCS as well as the hypothesis that individuality plays an essential role in DCS, as it has previously been proposed in animal models and human diving medicine.
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Affiliation(s)
- Alicia Velázquez-Wallraf
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria, Canary Islands, Spain
| | - Antonio Fernández
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria, Canary Islands, Spain
| | - Maria José Caballero
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria, Canary Islands, Spain
| | - Andreas Møllerløkken
- Faculty of Engineering, Norwegian University of Science and Technology, NTNU, Trondheim, Norway
| | - Paul D Jepson
- Institute of Zoology, Zoological Society of London, London, United Kingdom
| | - Marisa Andrada
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria, Canary Islands, Spain
| | - Yara Bernaldo de Quirós
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria, Canary Islands, Spain
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4
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NAGY G, AMBRUS M. The Evaluation of Syngas Loss from Disposable Syringe Sampling System: A Case Study. JOURNAL OF THE TURKISH CHEMICAL SOCIETY, SECTION A: CHEMISTRY 2020. [DOI: 10.18596/jotcsa.644994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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5
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Puig-Lozano R, Fernández A, Saavedra P, Tejedor M, Sierra E, De la Fuente J, Xuriach A, Díaz-Delgado J, Rivero MA, Andrada M, Bernaldo de Quirós Y, Arbelo M. Retrospective Study of Traumatic Intra-Interspecific Interactions in Stranded Cetaceans, Canary Islands. Front Vet Sci 2020; 7:107. [PMID: 32181264 PMCID: PMC7059454 DOI: 10.3389/fvets.2020.00107] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Accepted: 02/12/2020] [Indexed: 01/05/2023] Open
Abstract
Aggressive encounters involving cetacean species are widely described in the literature. However, detailed pathological studies regarding lesions produced by these encounters are scarce. From January 2000 to December 2017, 540 cetaceans stranded and were necropsied in the Canary Islands, Spain. Of them, 24 cases of eight species presented social traumatic lesions produced by cetaceans of the same or different species. All the cases presented severe multifocal vascular changes, 50% (12/24) presented fractures affecting mainly the thoracic region, 41.7% (10/24) acute tooth-rake marks, 37.5% (9/24) undigested food in the stomach, 33.3% (8/24) tracheal edema, and 12.5% (3/24) pulmonary perforation. In 10 cases with tooth-rake marks, the distance between the teeth, allowed us to further identify the aggressor species: four cases were compatible with killer whales (Orcinus orca) affecting three species [pigmy sperm whale (Kogia breviceps), Cuvier's beaked whale (Ziphius cavirostris), and short-finned pilot whale (Globicephala macrorhynchus)] and four cases compatible with common bottlenose dolphins (Tursiops truncatus) affecting two species [short-beaked common dolphin (Delphinus delphis) and Atlantic spotted dolphin (Stenella frontalis)]. We also described two cases of intraspecific interaction in stripped dolphin (Stenella coeruleoalba). Microscopically, 70.8% (17/24) of the cases presented acute degenerative myonecrosis, 66.7% (14/21) presented vacuoles in the myocardiocytes, 36.8% (7/19) pigmentary tubulonephrosis, 31.6% (6/19) cytoplasmic eosinophilic globules within hepatocytes, 21.4% (3/14) hemorrhages in the adrenal gland, and 17.3% (4/23) bronchiolar sphincter contraction. The statistical analysis revealed that deep divers, in good body condition and nearby La Gomera and Tenerife were more prone to these fatal interactions. Additionally, in this period, three animals died due to an accident during predation: a false killer whale (Pseudorca crassidens) died because of a fatal attempt of predation on a stingray, and two Risso's dolphins (Grampus griseus) died as a consequence of struggling while predating on large squids.
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Affiliation(s)
- Raquel Puig-Lozano
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria, Canary Islands, Spain
| | - Antonio Fernández
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria, Canary Islands, Spain
| | - Pedro Saavedra
- Department of Mathematics, University of Las Palmas de Gran Canaria, Las Palmas of Gran Canaria, Spain
| | - Marisa Tejedor
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria, Canary Islands, Spain
| | - Eva Sierra
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria, Canary Islands, Spain
| | - Jesús De la Fuente
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria, Canary Islands, Spain
| | - Aina Xuriach
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria, Canary Islands, Spain
| | - Josué Díaz-Delgado
- TVMDL, Texas A&M, Veterinary Medical Diagnostic Laboratory, Amarillo, TX, United States
| | - Miguel Antonio Rivero
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria, Canary Islands, Spain
| | - Marisa Andrada
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria, Canary Islands, Spain
| | - Yara Bernaldo de Quirós
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria, Canary Islands, Spain
| | - Manuel Arbelo
- Veterinary Histology and Pathology, Atlantic Center for Cetacean Research, University Institute of Animal Health and Food Safety (IUSA), Veterinary School, University of Las Palmas de Gran Canaria, Canary Islands, Spain
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6
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Bernaldo de Quirós Y, Fernandez A, Baird RW, Brownell RL, Aguilar de Soto N, Allen D, Arbelo M, Arregui M, Costidis A, Fahlman A, Frantzis A, Gulland FMD, Iñíguez M, Johnson M, Komnenou A, Koopman H, Pabst DA, Roe WD, Sierra E, Tejedor M, Schorr G. Advances in research on the impacts of anti-submarine sonar on beaked whales. Proc Biol Sci 2020; 286:20182533. [PMID: 30963955 DOI: 10.1098/rspb.2018.2533] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Mass stranding events (MSEs) of beaked whales (BWs) were extremely rare prior to the 1960s but increased markedly after the development of naval mid-frequency active sonar (MFAS). The temporal and spatial associations between atypical BW MSEs and naval exercises were first observed in the Canary Islands, Spain, in the mid-1980s. Further research on BWs stranded in association with naval exercises demonstrated pathological findings consistent with decompression sickness (DCS). A 2004 ban on MFASs around the Canary Islands successfully prevented additional BW MSEs in the region, but atypical MSEs have continued in other places of the world, especially in the Mediterranean Sea, with examined individuals showing DCS. A workshop held in Fuerteventura, Canary Islands, in September 2017 reviewed current knowledge on BW atypical MSEs associated with MFAS. Our review suggests that the effects of MFAS on BWs vary among individuals or populations, and predisposing factors may contribute to individual outcomes. Spatial management specific to BW habitat, such as the MFAS ban in the Canary Islands, has proven to be an effective mitigation tool and mitigation measures should be established in other areas taking into consideration known population-level information.
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Affiliation(s)
- Y Bernaldo de Quirós
- 1 Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School , C/Transmontaña s/n, 35416, Arucas, Las Palmas , Spain
| | - A Fernandez
- 1 Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School , C/Transmontaña s/n, 35416, Arucas, Las Palmas , Spain
| | - R W Baird
- 2 Cascadia Research Collective , 218½ W. 4th Avenue, Olympia, WA 98501 , USA
| | - R L Brownell
- 3 NOAA Fisheries, Southwest Fisheries Science Center , Monterey, CA 93940 , USA
| | - N Aguilar de Soto
- 4 BIOECOMAC. Dept. Animal Biology, Geology and Edaphology, University of La Laguna , Tenerife , Spain
| | - D Allen
- 5 US Marine Mammal Commission , 4340 East-West Highway, Suite 700, Bethesda, MD 20814 , USA
| | - M Arbelo
- 1 Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School , C/Transmontaña s/n, 35416, Arucas, Las Palmas , Spain
| | - M Arregui
- 1 Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School , C/Transmontaña s/n, 35416, Arucas, Las Palmas , Spain
| | - A Costidis
- 6 Virginia Aquarium & Marine Science Center Stranding Response Program , 717 General Booth Blvd, Virginia Beach, VA 23451 , USA
| | - A Fahlman
- 7 Fundación Oceanogràfic de la Comunitat Valenciana , Gran Vía Marqués del Turia 19, 46005, Valencia , Spain
| | - A Frantzis
- 8 Pelagos Cetacean Research Institute , Terpsichoris 21, 16671 Vouliagmeni , Greece
| | - F M D Gulland
- 5 US Marine Mammal Commission , 4340 East-West Highway, Suite 700, Bethesda, MD 20814 , USA.,9 The Marine Mammal Center , 2000 Bunker Road, Sausalito, CA 94965 , USA
| | - M Iñíguez
- 10 Fundación Cethus and WDC , Cap J. Bermúdez 1598, (1636), Olivos, Prov. Buenos Aires , Argentina
| | - M Johnson
- 11 Sea Mammal Research Unit, University of St Andrews , St Andrews , UK
| | - A Komnenou
- 12 School of Veterinary Medicine, Aristotle University of Thessaloniki , Thessaloniki , Greece
| | - H Koopman
- 13 Department of Biology and Marine Biology, University of North Carolina Wilmington , Wilmington, NC 28403 , USA
| | - D A Pabst
- 13 Department of Biology and Marine Biology, University of North Carolina Wilmington , Wilmington, NC 28403 , USA
| | - W D Roe
- 14 Massey University , Palmerston North, PN4222 , New Zealand
| | - E Sierra
- 1 Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School , C/Transmontaña s/n, 35416, Arucas, Las Palmas , Spain
| | - M Tejedor
- 15 Canary Islands Stranding Network , Irlanda 7, Playa Blanca, 35580, Lanzarote , Spain
| | - G Schorr
- 16 Marine Ecology & Telemetry Research , 2468 Camp McKenzie Tr NW, Seabeck, WA 98380 , USA
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7
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Mazzariol S, Centelleghe C, Cozzi B, Povinelli M, Marcer F, Ferri N, Di Francesco G, Badagliacca P, Profeta F, Olivieri V, Guccione S, Cocumelli C, Terracciano G, Troiano P, Beverelli M, Garibaldi F, Podestà M, Marsili L, Fossi MC, Mattiucci S, Cipriani P, De Nurra D, Zaccaroni A, Rubini S, Berto D, de Quiros YB, Fernandez A, Morell M, Giorda F, Pautasso A, Modesto P, Casalone C, Di Guardo G. Multidisciplinary studies on a sick-leader syndrome-associated mass stranding of sperm whales (Physeter macrocephalus) along the Adriatic coast of Italy. Sci Rep 2018; 8:11577. [PMID: 30068967 PMCID: PMC6070578 DOI: 10.1038/s41598-018-29966-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 07/21/2018] [Indexed: 11/20/2022] Open
Abstract
Mass strandings of sperm whales (Physeter macrocephalus) are rare in the Mediterranean Sea. Nevertheless, in 2014 a pod of 7 specimens stranded alive along the Italian coast of the Central Adriatic Sea: 3 individuals died on the beach after a few hours due to internal damages induced by prolonged recumbency; the remaining 4 whales were refloated after great efforts. All the dead animals were genetically related females; one was pregnant. All the animals were infected by dolphin morbillivirus (DMV) and the pregnant whale was also affected by a severe nephropathy due to a large kidney stone. Other analyses ruled out other possible relevant factors related to weather conditions or human activities. The results of multidisciplinary post-mortem analyses revealed that the 7 sperm whales entered the Adriatic Sea encountering adverse weather conditions and then kept heading northward following the pregnant but sick leader of the pod, thereby reaching the stranding site. DMV infection most likely played a crucial role in impairing the health condition and orientation abilities of the whales. They did not steer back towards deeper waters, but eventually stranded along the Central Adriatic Sea coastline, a real trap for sperm whales.
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Affiliation(s)
- Sandro Mazzariol
- Department of Comparative Biomedicine and Food Science, University of Padova, Padova, Italy
| | - Cinzia Centelleghe
- Department of Comparative Biomedicine and Food Science, University of Padova, Padova, Italy.
| | - Bruno Cozzi
- Department of Comparative Biomedicine and Food Science, University of Padova, Padova, Italy
| | - Michele Povinelli
- Department of Comparative Biomedicine and Food Science, University of Padova, Padova, Italy
| | - Federica Marcer
- Department of Animal Medicine, Production and Health, University of Padova, Padova, Italy
| | - Nicola Ferri
- Istituto Zooprofilattico Sperimentale dell'Abruzzo e del Molise "G. Caporale", Teramo, Italy
| | - Gabriella Di Francesco
- Istituto Zooprofilattico Sperimentale dell'Abruzzo e del Molise "G. Caporale", Teramo, Italy
| | - Pietro Badagliacca
- Istituto Zooprofilattico Sperimentale dell'Abruzzo e del Molise "G. Caporale", Teramo, Italy
| | - Francesca Profeta
- University of Teramo, Faculty of Veterinary Medicine, Località Piano d'Accio, 64100, Teramo, Italy
| | | | | | - Cristiano Cocumelli
- Istituto Zooprofilattico Sperimentale del Lazio e della Toscana M. Aleandri, Rome, Italy
| | - Giuliana Terracciano
- Istituto Zooprofilattico Sperimentale del Lazio e della Toscana M. Aleandri, Rome, Italy
| | - Pasquale Troiano
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Foggia, Italy
| | - Matteo Beverelli
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Foggia, Italy
| | | | | | - Letizia Marsili
- Department of Physical Science, Earth and Environment, University of Siena, Siena, Italy
| | - Maria Cristina Fossi
- Department of Physical Science, Earth and Environment, University of Siena, Siena, Italy
| | - Simonetta Mattiucci
- Department of Public Health and Infectious Diseases, University La Sapienza, Rome, Italy
| | - Paolo Cipriani
- Department of Public Health and Infectious Diseases, University La Sapienza, Rome, Italy
| | - Daniele De Nurra
- Istituto Zooprofilattico Sperimentale della Sardegna, Sassari, Italy
| | | | - Silva Rubini
- Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia Romagna, Ferrara, Italy
| | | | - Yara Beraldo de Quiros
- Institute of Animal Health and Food Safety, Universitad de Las Palmas de Gran Canaria, Las Palmas, Spain
| | - Antonio Fernandez
- Institute of Animal Health and Food Safety, Universitad de Las Palmas de Gran Canaria, Las Palmas, Spain
| | - Maria Morell
- Institute for Neurosciences of Montpellier (Inserm UMR 1051), Montpellier, France
| | - Federica Giorda
- Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Val d'Aosta, Torino, Italy
| | - Alessandra Pautasso
- Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Val d'Aosta, Torino, Italy
| | - Paola Modesto
- Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Val d'Aosta, Torino, Italy
| | - Cristina Casalone
- Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Val d'Aosta, Torino, Italy
| | - Giovanni Di Guardo
- University of Teramo, Faculty of Veterinary Medicine, Località Piano d'Accio, 64100, Teramo, Italy
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8
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Bernaldo de Quirós Y, Hartwick M, Rotstein DS, Garner MM, Bogomolni A, Greer W, Niemeyer ME, Early G, Wenzel F, Moore M. Discrimination between bycatch and other causes of cetacean and pinniped stranding. DISEASES OF AQUATIC ORGANISMS 2018; 127:83-95. [PMID: 29384478 DOI: 10.3354/dao03189] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The challenge of identifying cause of death in discarded bycaught marine mammals stems from a combination of the non-specific nature of the lesions of drowning, the complex physiologic adaptations unique to breath-holding marine mammals, lack of case histories, and the diverse nature of fishing gear. While no pathognomonic lesions are recognized, signs of acute external entanglement, bulging or reddened eyes, recently ingested gastric contents, pulmonary changes, and decompression-associated gas bubbles have been identified in the condition of peracute underwater entrapment (PUE) syndrome in previous studies of marine mammals. We reviewed the gross necropsy and histopathology reports of 36 cetaceans and pinnipeds including 20 directly observed bycaught and 16 live stranded animals that were euthanized between 2005 and 2011 for lesions consistent with PUE. We identified 5 criteria which present at significantly higher rates in bycaught marine mammals: external signs of acute entanglement, red or bulging eyes, recently ingested gastric contents, multi-organ congestion, and disseminated gas bubbles detected grossly during the necropsy and histologically. In contrast, froth in the trachea or primary bronchi, and lung changes (i.e. wet, heavy, froth, edema, congestion, and hemorrhage) were poor indicators of PUE. This is the first study that provides insight into the different published parameters for PUE in bycatch. For regions frequently confronted by stranded marine mammals with non-specific lesions, this could potentially aid in the investigation and quantification of marine fisheries interactions.
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Affiliation(s)
- Yara Bernaldo de Quirós
- Woods Hole Oceanographic Institution, Biology Department, Woods Hole, Massachusetts 02543, USA
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9
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Bernaldo de Quirós Y, Saavedra P, Møllerløkken A, Brubakk AO, Jørgensen A, González-Díaz O, Martín-Barrasa JL, Fernández A. Differentiation at necropsy between in vivo gas embolism and putrefaction using a gas score. Res Vet Sci 2016; 106:48-55. [PMID: 27234535 DOI: 10.1016/j.rvsc.2016.03.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2015] [Revised: 02/19/2016] [Accepted: 03/07/2016] [Indexed: 11/18/2022]
Abstract
Gas bubble lesions consistent with decompression sickness in marine mammals were described for the first time in beaked whales stranded in temporal and spatial association with military exercises. Putrefaction gas is a post-mortem artifact, which hinders the interpretation of gas found at necropsy. Gas analyses have been proven to help differentiating putrefaction gases from gases formed after hyperbaric exposures. Unfortunately, chemical analysis cannot always be performed. Post-mortem computed tomography is used to study gas collections, but many different logistical obstacles and obvious challenges, like the size of the animal or the transport of the animal from the stranding location to the scanner, limit its use in stranded marine mammals. In this study, we tested the diagnostic value of an index-based method for characterizing the amount and topography of gas found grossly during necropsies. For this purpose, putrefaction gases, intravenously infused atmospheric air, and gases produced by decompression were evaluated at necropsy with increased post-mortem time in New Zealand White Rabbits using a gas score index. Statistical differences (P<0.001) were found between the three experimental models immediately after death. Differences in gas score between in vivo gas embolism and putrefaction gases were found significant (P<0.05) throughout the 67h post-mortem. The gas score-index is a new and simple method that can be used by all stranding networks, which has been shown through this study to be a valid diagnostic tool to distinguish between fatal decompression, iatrogenic air embolism and putrefaction gases at autopsies.
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Affiliation(s)
- Yara Bernaldo de Quirós
- Veterinary Histology and Pathology, Department of Morphology, Institute of Animal Health, Veterinary School, University of Las Palmas de Gran Canaria (ULPGC), Trasmontaña s/n, 35416 Arucas, Las Palmas, Spain.
| | - Pedro Saavedra
- Department of Mathematics, University of Las Palmas de Gran Canaria (ULPGC), Campus de Tafira s/n, 35017, Las Palmas, Spain.
| | - Andreas Møllerløkken
- Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway.
| | - Alf O Brubakk
- Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway.
| | - Arve Jørgensen
- Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway; Department of Diagnostic Imaging, St. Olavs University Hospital, Trondheim, Norway.
| | - Oscar González-Díaz
- Physical and Chemical Instrumental Center for the Development of Applied Research Technology and Scientific estate, Edificio Polivalente 1, University of Las Palmas de Gran Canaria (ULPGC), Campus de Tafira s/n, 35017, Las Palmas, Spain.
| | - Jose L Martín-Barrasa
- Multidisciplinary Organ Dysfunction Evaluation Research Network, Research Unit, Hospital Universitario de Gran Canaria, Dr. Negrín, Las Palmas de Gran Canaria, Las Palmas, Spain; Infectious Diseases and Fish Pathology, Institute of Animal Health, Veterinary School, University of Las Palmas de Gran Canaria (ULPGC), Trasmontaña s/n, 35416 Arucas, Las Palmas, Spain.
| | - Antonio Fernández
- Veterinary Histology and Pathology, Department of Morphology, Institute of Animal Health, Veterinary School, University of Las Palmas de Gran Canaria (ULPGC), Trasmontaña s/n, 35416 Arucas, Las Palmas, Spain.
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10
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García-Párraga D, Crespo-Picazo JL, de Quirós YB, Cervera V, Martí-Bonmati L, Díaz-Delgado J, Arbelo M, Moore MJ, Jepson PD, Fernández A. Decompression sickness ('the bends') in sea turtles. DISEASES OF AQUATIC ORGANISMS 2014; 111:191-205. [PMID: 25320032 DOI: 10.3354/dao02790] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Decompression sickness (DCS), as clinically diagnosed by reversal of symptoms with recompression, has never been reported in aquatic breath-hold diving vertebrates despite the occurrence of tissue gas tensions sufficient for bubble formation and injury in terrestrial animals. Similarly to diving mammals, sea turtles manage gas exchange and decompression through anatomical, physiological, and behavioral adaptations. In the former group, DCS-like lesions have been observed on necropsies following behavioral disturbance such as high-powered acoustic sources (e.g. active sonar) and in bycaught animals. In sea turtles, in spite of abundant literature on diving physiology and bycatch interference, this is the first report of DCS-like symptoms and lesions. We diagnosed a clinico-pathological condition consistent with DCS in 29 gas-embolized loggerhead sea turtles Caretta caretta from a sample of 67. Fifty-nine were recovered alive and 8 had recently died following bycatch in trawls and gillnets of local fisheries from the east coast of Spain. Gas embolization and distribution in vital organs were evaluated through conventional radiography, computed tomography, and ultrasound. Additionally, positive response following repressurization was clinically observed in 2 live affected turtles. Gas embolism was also observed postmortem in carcasses and tissues as described in cetaceans and human divers. Compositional gas analysis of intravascular bubbles was consistent with DCS. Definitive diagnosis of DCS in sea turtles opens a new era for research in sea turtle diving physiology, conservation, and bycatch impact mitigation, as well as for comparative studies in other air-breathing marine vertebrates and human divers.
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Affiliation(s)
- D García-Párraga
- Oceanografic, Veterinary Services, Parques Reunidos Valencia, Ciudad de las Artes y las Ciencias, C/ Eduardo Primo Yúfera 1B, 46013 Valencia, Spain
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11
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Danil K, St Leger JA, Dennison S, Bernaldo de Quirós Y, Scadeng M, Nilson E, Beaulieu N. Clostridium perfringens septicemia in a long-beaked common dolphin Delphinus capensis: an etiology of gas bubble accumulation in cetaceans. DISEASES OF AQUATIC ORGANISMS 2014; 111:183-190. [PMID: 25320031 DOI: 10.3354/dao02783] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
An adult female long-beaked common dolphin Delphinus capensis live-stranded in La Jolla, California, USA, on July 30, 2012 and subsequently died on the beach. Computed tomography and magnetic resonance imaging revealed gas bubble accumulation in the vasculature, organ parenchyma, mandibular fat pads, and subdermal sheath as well as a gas-filled cavity within the liver, mild caudal abdominal effusion, and fluid in the uterus. Gross examination confirmed these findings and also identified mild ulcerations on the palate, ventral skin, and flukes, uterine necrosis, and multifocal parenchymal cavitations in the brain. Histological review demonstrated necrosis and round clear spaces interpreted as gas bubbles with associated bacterial rods within the brain, liver, spleen, and lymph nodes. Anaerobic cultures of the lung, spleen, liver, bone marrow, and abdominal fluid yielded Clostridium perfringens, which was further identified as type A via a multiplex PCR assay. The gas composition of sampled bubbles was typical of putrefaction gases, which is consistent with the by-products of C. perfringens, a gas-producing bacterium. Gas bubble formation in marine mammals due to barotrauma, and peri- or postmortem off-gassing of supersaturated tissues and blood has been previously described. This case study concluded that a systemic infection of C. perfringens likely resulted in production of gas and toxins, causing tissue necrosis.
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Affiliation(s)
- Kerri Danil
- Marine Mammal & Turtle Division, Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 8901 La Jolla Shores Drive, La Jolla, CA 92037, USA
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12
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Lane EP, de Wet M, Thompson P, Siebert U, Wohlsein P, Plön S. A systematic health assessment of indian ocean bottlenose (Tursiops aduncus) and indo-pacific humpback (Sousa plumbea) dolphins incidentally caught in shark nets off the KwaZulu-Natal Coast, South Africa. PLoS One 2014; 9:e107038. [PMID: 25203143 PMCID: PMC4159300 DOI: 10.1371/journal.pone.0107038] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Accepted: 08/13/2014] [Indexed: 11/21/2022] Open
Abstract
Coastal dolphins are regarded as indicators of changes in coastal marine ecosystem health that could impact humans utilizing the marine environment for food or recreation. Necropsy and histology examinations were performed on 35 Indian Ocean bottlenose dolphins (Tursiops aduncus) and five Indo-Pacific humpback dolphins (Sousa plumbea) incidentally caught in shark nets off the KwaZulu-Natal coast, South Africa, between 2010 and 2012. Parasitic lesions included pneumonia (85%), abdominal and thoracic serositis (75%), gastroenteritis (70%), hepatitis (62%), and endometritis (42%). Parasitic species identified were Halocercus sp. (lung), Crassicauda sp. (skeletal muscle) and Xenobalanus globicipitis (skin). Additional findings included bronchiolar epithelial mineralisation (83%), splenic filamentous tags (45%), non-suppurative meningoencephalitis (39%), and myocardial fibrosis (26%). No immunohistochemically positive reaction was present in lesions suggestive of dolphin morbillivirus, Toxoplasma gondii and Brucella spp. The first confirmed cases of lobomycosis and sarcocystosis in South African dolphins were documented. Most lesions were mild, and all animals were considered to be in good nutritional condition, based on blubber thickness and muscle mass. Apparent temporal changes in parasitic disease prevalence may indicate a change in the host/parasite interface. This study provided valuable baseline information on conditions affecting coastal dolphin populations in South Africa and, to our knowledge, constitutes the first reported systematic health assessment in incidentally caught dolphins in the Southern Hemisphere. Further research on temporal disease trends as well as disease pathophysiology and anthropogenic factors affecting these populations is needed.
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Affiliation(s)
- Emily P. Lane
- Department of Research and Scientific Services, National Zoological Gardens of South Africa, Pretoria, South Africa
| | - Morné de Wet
- Epidemiology Section, Department of Production Animal Studies, Faculty of Veterinary Science, University of Pretoria, Pretoria, South Africa
| | - Peter Thompson
- Epidemiology Section, Department of Production Animal Studies, Faculty of Veterinary Science, University of Pretoria, Pretoria, South Africa
| | - Ursula Siebert
- Institute for Terrestrial and Aquatic Wildlife Research, University of Veterinary Medicine, Hannover, Foundation, Germany
| | - Peter Wohlsein
- Department of Pathology, University of Veterinary Medicine, Hannover, Foundation, Germany
| | - Stephanie Plön
- South African Institute for Aquatic Biodiversity, c/o Port Elizabeth Museum/Bayworld, Port Elizabeth, South Africa
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13
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Bernaldo de Quirós Y, Seewald JS, Sylva SP, Greer B, Niemeyer M, Bogomolni AL, Moore MJ. Compositional discrimination of decompression and decomposition gas bubbles in bycaught seals and dolphins. PLoS One 2013; 8:e83994. [PMID: 24367623 PMCID: PMC3868626 DOI: 10.1371/journal.pone.0083994] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Accepted: 11/11/2013] [Indexed: 11/18/2022] Open
Abstract
Gas bubbles in marine mammals entangled and drowned in gillnets have been previously described by computed tomography, gross examination and histopathology. The absence of bacteria or autolytic changes in the tissues of those animals suggested that the gas was produced peri- or post-mortem by a fast decompression, probably by quickly hauling animals entangled in the net at depth to the surface. Gas composition analysis and gas scoring are two new diagnostic tools available to distinguish gas embolisms from putrefaction gases. With this goal, these methods have been successfully applied to pathological studies of marine mammals. In this study, we characterized the flux and composition of the gas bubbles from bycaught marine mammals in anchored sink gillnets and bottom otter trawls. We compared these data with marine mammals stranded on Cape Cod, MA, USA. Fresh animals or with moderate decomposition (decomposition scores of 2 and 3) were prioritized. Results showed that bycaught animals presented with significantly higher gas scores than stranded animals. Gas composition analyses indicate that gas was formed by decompression, confirming the decompression hypothesis.
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Affiliation(s)
- Yara Bernaldo de Quirós
- Woods Hole Oceanographic Institution, Biology Department, Woods Hole, Massachusetts, United States of America
- * E-mail:
| | - Jeffrey S. Seewald
- Woods Hole Oceanographic Institution, Marine Chemistry and Geochemistry Department, Woods Hole, Massachusetts , United States of America
| | - Sean P. Sylva
- Woods Hole Oceanographic Institution, Marine Chemistry and Geochemistry Department, Woods Hole, Massachusetts , United States of America
| | - Bill Greer
- Integrated Statistics, Woods Hole, Massachusetts, United States of America
- NOAA NMFS Northeast Fisheries, Woods Hole, Massachusetts, United States of America
| | - Misty Niemeyer
- International Fund for Animal Welfare, Yarmouth Port, Massachusetts, United States of America
| | - Andrea L. Bogomolni
- Woods Hole Oceanographic Institution, Biology Department, Woods Hole, Massachusetts, United States of America
- University of Connecticut, Department of Pathobiology and Veterinary Science, Storrs, Connecticut, United States of America
| | - Michael J. Moore
- Woods Hole Oceanographic Institution, Biology Department, Woods Hole, Massachusetts, United States of America
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14
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First indication of gas embolism in a harbour porpoise (Phocoena phocoena) from German waters. EUR J WILDLIFE RES 2013. [DOI: 10.1007/s10344-013-0700-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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15
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Differentiation at autopsy between in vivo gas embolism and putrefaction using gas composition analysis. Int J Legal Med 2012; 127:437-45. [DOI: 10.1007/s00414-012-0783-6] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2012] [Accepted: 10/04/2012] [Indexed: 11/27/2022]
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16
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Costidis A, Rommel SA. Vascularization of Air Sinuses and Fat Bodies in the Head of the Bottlenose Dolphin (Tursiops truncatus): Morphological Implications on Physiology. Front Physiol 2012; 3:243. [PMID: 22969724 PMCID: PMC3431794 DOI: 10.3389/fphys.2012.00243] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Accepted: 06/13/2012] [Indexed: 11/15/2022] Open
Abstract
Cetaceans have long been considered capable of limiting diving-induced nitrogen absorption and subsequent decompression sickness through a series of behavioral, anatomical, and physiological adaptations. Recent studies however suggest that in some situations these adaptive mechanisms might be overcome, resulting in lethal and sublethal injuries. Perhaps most relevant to this discussion is the finding of intravascular gas and fat emboli in mass-stranded beaked whales. Although the source of the gas emboli has as yet to been ascertained, preliminary findings suggest nitrogen is the primary component. Since nitrogen gas embolus formation in divers is linked to nitrogen saturation, it seems premature to dismiss similar pathogenic mechanisms in breath-hold diving cetaceans. Due to the various anatomical adaptations in cetacean lungs, the pulmonary system is thought of as an unlikely site of significant nitrogen absorption. The accessory sinus system on the ventral head of odontocete cetaceans contains a sizeable volume of air that is exposed to the changing hydrostatic pressures during a dive, and is intimately associated with vasculature potentially capable of absorbing nitrogen through its walls. The source of the fat emboli has also remained elusive. Most mammalian fat deposits are considered poorly vascularized and therefore unlikely sites of intravascular introduction of lipid, although cetacean blubber may not be as poorly vascularized as previously thought. We present new data on the vasculature of air sinuses and acoustic fat bodies in the head of bottlenose dolphins and compare it to published accounts. We show that the mandibular fat bodies and accessory sinus system are associated with extensive venous plexuses and suggest potential physiological and pathological implications.
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Affiliation(s)
- Alex Costidis
- Aquatic Animal Health Program, Department of Physiological Sciences, College of Veterinary Medicine, University of Florida Gainesville, FL, USA
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17
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de Quirós YB, González-Diaz O, Arbelo M, Sierra E, Sacchini S, Fernández A. Decompression vs. Decomposition: Distribution, Amount, and Gas Composition of Bubbles in Stranded Marine Mammals. Front Physiol 2012; 3:177. [PMID: 22675306 PMCID: PMC3366475 DOI: 10.3389/fphys.2012.00177] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2012] [Accepted: 05/14/2012] [Indexed: 11/13/2022] Open
Abstract
Gas embolic lesions linked to military sonar have been described in stranded cetaceans including beaked whales. These descriptions suggest that gas bubbles in marine mammal tissues may be more common than previously thought. In this study we have analyzed gas amount (by gas score) and gas composition within different decomposition codes using a standardized methodology. This broad study has allowed us to explore species-specific variability in bubble prevalence, amount, distribution, and composition, as well as masking of bubble content by putrefaction gases. Bubbles detected within the cardiovascular system and other tissues related to both pre- and port-mortem processes are a common finding on necropsy of stranded cetaceans. To minimize masking by putrefaction gases, necropsy, and gas sampling must be performed as soon as possible. Before 24 h post mortem is recommended but preferably within 12 h post mortem. At necropsy, amount of bubbles (gas score) in decomposition code 2 in stranded cetaceans was found to be more important than merely presence vs. absence of bubbles from a pathological point of view. Deep divers presented higher abundance of gas bubbles, mainly composed of 70% nitrogen and 30% CO2, suggesting a higher predisposition of these species to suffer from decompression-related gas embolism.
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Affiliation(s)
- Yara Bernaldo de Quirós
- Veterinary Histology and Pathology, Department of Morphology, Institute of Animal Health, Veterinary School, University of Las Palmas de Gran Canaria Las Palmas, Spain
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