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Richard MA, Elliott S, Hummel SL, Woolnough DA, Rzodkiewicz LD, Gill SP, Rappold J, Annis ML. Reduced Freshwater Mussel Juvenile Production as a Result of Agricultural and Urban Contaminant Mixture Exposures. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2024. [PMID: 38517160 DOI: 10.1002/etc.5844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 09/17/2023] [Accepted: 02/10/2024] [Indexed: 03/23/2024]
Abstract
Freshwater mussels provide invaluable ecological services but are threatened by habitat alteration, poor water quality, invasive species, climate change, and contaminants, including contaminants of emerging concern (CECs). Contaminants of emerging concerns are well documented in aquatic environments, including the Great Lakes Basin, but limited information is available on how environmentally relevant mixtures affect freshwater mussel biology throughout their varied life stages. Our main goal was to assess mussels' reproductive output in response to exposure to agricultural and urban CEC mixtures during glochidial development through juvenile transformation and excystment focusing on how exposure duration and treatment affect: (1) the number of glochidia prematurely released by brooding females, (2) glochidial transformation through host-fish excystment, and (3) the number of fully metamorphosed juveniles able to continue the lifecycle. Mussels and host fish were exposed to either a control water (CW), control ethanol (CE), agriculture CEC mixture (AM), or urban CEC mixture (UM) for 40 and 100 days. We found no effect from treatment or exposure duration on the number of glochidia prematurely released. Fewer partially and fully metamorphosed AM juveniles were observed during the 100-day exposure, compared with the 40-day. During the 40-day exposure, CW produced more fully metamorphosed individuals compared with CE and UM, but during the 100-day exposure AM produced more fully metamorphosed individuals compared with the CW. There was reduction in fully metamorphosed juveniles compared with partially metamorphosed for CE and UM during the 40-day exposure, as well as in the CW during the 100-day exposure. These results will be important for understanding how mussel populations are affected by CEC exposure. The experiments also yielded many insights for laboratory toxicology exposure studies. Environ Toxicol Chem 2024;00:1-14. © 2024 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC. This article has been contributed to by U.S. Government employees and their work is in the public domain in the USA.
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Affiliation(s)
- Molly A Richard
- Upper Midwest Water Science Center, US Geological Survey, Lansing, Michigan, USA
| | - Sarah Elliott
- Upper Midwest Water Science Center, US Geological Survey, Mounds View, Minnesota, USA
| | - Stephanie L Hummel
- Midwest Regional Office, US Fish and Wildlife Service, Bloomington, Minnesota, USA
| | - Daelyn A Woolnough
- Department of Biology and Institute for Great Lakes Research, Central Michigan University, Mt. Pleasant, Michigan, USA
| | - Lacey D Rzodkiewicz
- Department of Biology and Institute for Great Lakes Research, Central Michigan University, Mt. Pleasant, Michigan, USA
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Stephanie P Gill
- Department of Biology and Institute for Great Lakes Research, Central Michigan University, Mt. Pleasant, Michigan, USA
| | - Justin Rappold
- Department of Biology and Institute for Great Lakes Research, Central Michigan University, Mt. Pleasant, Michigan, USA
| | - Mandy L Annis
- Michigan Ecological Services Field Office, US Fish & Wildlife Service, East Lansing, Michigan, USA
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Abstract
Freshwater mussels in the order Unionida are highly adapted to parasitize fish for the primary purpose of dispersal. The parasitic larval stage affixes itself to the gills or fins of the host where it becomes encysted in the tissue, eventually excysting to develop into a free-living adult. Research on the parasitic interactions between unionids and their host fishes has garnered attention recently due to the increase in worldwide preservation efforts surrounding this highly endangered and ecologically significant order. With the exception of heavy infestation events, these mussels cause minor effects to their hosts, typically only observable effect in combination with other stressors. Moreover, the range of effect intensities on the host varies greatly with the species involved in the interaction, an effect that may arise from different evolutionary strategies between long- and short-infesting mussels; a distinction not typically made in conservation practices. Lower growth and reduced osmotic potential in infested hosts are commonly observed and correlated with infestation load. These effects are typically also associated with increases in metabolic rate and behaviour indicative of stress. Host fish seem to compensate for this through a combination of rapid wound healing in the parasitized areas and higher ventilation rates. The findings are heavily biased towards Margaritifera margaritifera, a unique mussel not well suited for cross-species generalizations. Furthermore, the small body of molecular and genetic studies should be expanded as many conclusions are drawn from studies on the ultimate effects of glochidiosis rather than proximate studies on the underlying mechanisms.
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Horne L, DeVries D, Stoeckel J. The Effects of Glochidia Infection on the Metabolic Rate and Hypoxia Tolerance of Bluegill Lepomis macrochirus and Largemouth Bass Micropterus salmoides. J Parasitol 2022; 108:467-475. [DOI: 10.1645/22-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- Lindsay Horne
- School of Fisheries, Aquaculture and Aquatic Sciences, Auburn University, Auburn, Alabama 36849
| | - Dennis DeVries
- School of Fisheries, Aquaculture and Aquatic Sciences, Auburn University, Auburn, Alabama 36849
| | - James Stoeckel
- School of Fisheries, Aquaculture and Aquatic Sciences, Auburn University, Auburn, Alabama 36849
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Castrillo PA, Varela-Dopico C, Ondina P, Quiroga MI, Bermúdez R. Early stages of Margaritifera margaritifera glochidiosis in Atlantic salmon: Morphopathological characterization. JOURNAL OF FISH DISEASES 2020; 43:69-80. [PMID: 31642063 DOI: 10.1111/jfd.13100] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Revised: 09/26/2019] [Accepted: 09/27/2019] [Indexed: 06/10/2023]
Abstract
Freshwater mussels of the order Unionida encyst into the fish mucosa to metamorphose and complete their life cycle, causing a parasitic disease known as glochidiosis. This parasitic stage represents a bottleneck for the survival of naiads, particularly for critically endangered species as Margaritifera margaritifera; however, little is known about the events occurring during this critical stage. Therefore, this study aimed to histologically characterize the development of M. margaritifera glochidiosis in Atlantic salmon to get insight into the pathogenesis of this interaction. Fish exposed to glochidia were sampled during the first 44 days post-exposure, and organs were observed by stereomicroscopy and light microscopy. Glochidia attached to the gills by pinching the lamellar epithelium, whereupon an acute proliferative branchitis engulfed most of the larvae. However, during the first 14 days, a severe detachment of unviable glochidia occurred, associated with the presence of pleomorphic inflammatory infiltrate and epithelial degeneration. In the cases where larvae remained attached, a chronification of the lesions with none to scarce inflammation was observed. These results provide key information to better understand the complex host-parasite interaction during the early stages of glochidiosis and provide valuable information to optimize artificial rearing of naiads in conservation of threatened freshwater mussel populations.
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Affiliation(s)
- Pedro A Castrillo
- Department of Anatomy, Animal Production and Veterinary Clinical Sciences, Faculty of Veterinary, Universidade de Santiago de Compostela, Lugo, Spain
| | - Catuxa Varela-Dopico
- Department of Zoology, Genetics and Physical Anthropology, Faculty of Veterinary, Universidade de Santiago de Compostela, Lugo, Spain
| | - Paz Ondina
- Department of Zoology, Genetics and Physical Anthropology, Faculty of Veterinary, Universidade de Santiago de Compostela, Lugo, Spain
| | - María Isabel Quiroga
- Department of Anatomy, Animal Production and Veterinary Clinical Sciences, Faculty of Veterinary, Universidade de Santiago de Compostela, Lugo, Spain
- Instituto de Acuicultura, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Roberto Bermúdez
- Department of Anatomy, Animal Production and Veterinary Clinical Sciences, Faculty of Veterinary, Universidade de Santiago de Compostela, Lugo, Spain
- Instituto de Acuicultura, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
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5
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Methling C, Douda K, Reichard M. Intensity-dependent energetic costs in a reciprocal parasitic relationship. Oecologia 2019; 191:285-294. [PMID: 31494712 DOI: 10.1007/s00442-019-04504-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 09/04/2019] [Indexed: 01/05/2023]
Abstract
Parasitic infections elicit host defences that pose energetic trade-offs with other fitness-related traits. Bitterling fishes and unionid mussels are involved in a two-way parasitic interaction. Bitterling exploit mussels by ovipositing into their gills. In turn, mussel larvae (glochidia) develop on the epidermis and gills of fish. Hosts have evolved behavioural responses to reduce parasite load, suggesting that glochidia and bitterling parasitism are costly. We examined the energetic cost of parasitism on both sides of this relationship. We used intermittent flow-through respirometry to measure (1) standard metabolic rate (SMR) of individual duck mussels Anodonta anatina (a common bitterling host) before and during infection by embryos of the European bitterling Rhodeus amarus, and (2) SMR and maximum oxygen uptake (MO2max) of individual R. amarus before and during infection with glochidia of the Chinese pond mussel Sinanodonta woodiana (a mussel species that successfully infects bitterling). As predicted, we observed an increase in mussel SMR when infected by bitterling embryos and an increased SMR in glochidia-infected bitterling, though this was significantly mediated by the time post-infection. Contrary to our predictions, glochidia infection did not impair MO2max and the number of glochidia attached to gills positively (rather than negatively) correlated with MO2max. The results suggest that tolerance is the prevailing coping mechanism for both fish and mussels when infected, while resistance mechanisms appear to be confined to the behavioural level.
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Affiliation(s)
- Caroline Methling
- Institute of Vertebrate Biology, Czech Academy of Sciences, Květná 8, 603 65, Brno, Czech Republic
| | - Karel Douda
- Department of Zoology and Fisheries, Czech University of Life Sciences Prague, Prague, Czech Republic
| | - Martin Reichard
- Institute of Vertebrate Biology, Czech Academy of Sciences, Květná 8, 603 65, Brno, Czech Republic.
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Gendron AD, Sanchez D, Douville M, Houde M. Stress-related gene transcription in fish exposed to parasitic larvae of two freshwater mussels with divergent infection strategies. DISEASES OF AQUATIC ORGANISMS 2019; 132:191-202. [PMID: 31188134 DOI: 10.3354/dao03319] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Freshwater unionoid mussels have a unique life cycle involving a temporary parasitic phase. Their larvae (glochidia) attach to the gills or fins of fish hosts where they remain encysted until metamorphosis into free-living juveniles. The physiological response of fish during the critical period of glochidial attachment is not well understood, but recent work suggests that glochidia retention and survival is enhanced in stressed and cortisol-injected hosts. In this study, the early changes induced by glochidiosis were investigated for the first time at the transcriptional level. In 2 separate experiments, juvenile yellow perch Perca flavescens were inoculated with glochidia of Elliptio complanata (a host generalist) and Lampsilis radiata (a host specialist) following a standardized procedure. The transcriptional levels of 5 genes involved in the fish response to stress were assessed in the host liver and gills 24 h post-infection using quantitative real-time PCR. The number of encysted glochidia did not significantly differ between fish inoculated with E. complanata and L. radiata. Both species induced a 3-fold increase of 70 kDa heat-shock protein gene (hsp70) transcription in host liver. However, only E. complanata influenced the transcription of cortisol-regulated genes, notably glucocorticoid receptor DNA-binding factor 1 (grlf1). This gene, known to modulate tissue responsiveness to cortisol, was downregulated in infected fish compared to controls. Our findings suggest that different glochidia species interact with their fish host in distinct ways. Additional studies are required to address this hypothesis and further investigate the significance of the observed host transcriptional responses.
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Affiliation(s)
- Andrée D Gendron
- Aquatic Contaminants Research Division, Water Science and Technology Directorate, Environment and Climate Change Canada, 105 McGill, Montreal, Quebec H2Y 2E7, Canada
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7
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Hewitt TL, Wood CL, Ó Foighil D. Ecological correlates and phylogenetic signal of host use in North American unionid mussels. Int J Parasitol 2019; 49:71-81. [DOI: 10.1016/j.ijpara.2018.09.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 09/01/2018] [Accepted: 09/03/2018] [Indexed: 10/27/2022]
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8
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Methling C, Douda K, Liu H, Rouchet R, Bartáková V, Yu D, Smith C, Reichard M. Energetic costs in the relationship between bitterling and mussels in East Asia. Biol J Linn Soc Lond 2018. [DOI: 10.1093/biolinnean/bly178] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Caroline Methling
- The Czech Academy of Sciences, Institute of Vertebrate Biology, Brno, Czech Republic
| | - Karel Douda
- Department of Zoology and Fisheries, Czech University of Life Sciences Prague, Prague, Czech Republic
| | - Huanzhang Liu
- The Key Laboratory of Aquatic Biodiversity and Conservation, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
| | - Romain Rouchet
- The Czech Academy of Sciences, Institute of Vertebrate Biology, Brno, Czech Republic
| | - Veronika Bartáková
- The Czech Academy of Sciences, Institute of Vertebrate Biology, Brno, Czech Republic
| | - Dan Yu
- The Key Laboratory of Aquatic Biodiversity and Conservation, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
| | - Carl Smith
- The Czech Academy of Sciences, Institute of Vertebrate Biology, Brno, Czech Republic
- Department of Ecology and Vertebrate Zoology, University of Łódź, Łódź, Poland
- School of Biology, University of St Andrews, St Andrews, UK
- Bell Pettigrew Museum of Natural History, University of St Andrews, St Andrews, UK
| | - Martin Reichard
- The Czech Academy of Sciences, Institute of Vertebrate Biology, Brno, Czech Republic
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Gąsienica-Staszeczek M, Zając K, Zając T, Olejniczak P. In vitro culture of glochidia of the threatened freshwater mussel Unio crassus Philipsson 1788 – the dilution problem. INVERTEBR REPROD DEV 2017. [DOI: 10.1080/07924259.2017.1362482] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
| | - Katarzyna Zając
- Institute of Nature Conservation, Polish Academy of Sciences, Kraków, Poland
| | - Tadeusz Zając
- Institute of Nature Conservation, Polish Academy of Sciences, Kraków, Poland
| | - Paweł Olejniczak
- Institute of Nature Conservation, Polish Academy of Sciences, Kraków, Poland
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10
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Direct impact of invasive bivalve (Sinanodonta woodiana) parasitism on freshwater fish physiology: evidence and implications. Biol Invasions 2016. [DOI: 10.1007/s10530-016-1319-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Harriger KM, Knight JR, Wegener MG. Host-Fish Identifications for Two Gulf Coast-Drainage Freshwater Mussels, Lampsilis straminea(Southern Fatmucket) and Quadrula succissa(Purple Pigtoe). SOUTHEAST NAT 2015. [DOI: 10.1656/058.014.0204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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12
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Haag WR, Stoeckel JA. The role of host abundance in regulating populations of freshwater mussels with parasitic larvae. Oecologia 2015; 178:1159-68. [DOI: 10.1007/s00442-015-3310-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Accepted: 03/19/2015] [Indexed: 11/28/2022]
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13
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Fritts AK, Barnhart MC, Bradley M, Liu N, Cope WG, Hammer E, Bringolf RB. Assessment of toxicity test endpoints for freshwater mussel larvae (glochidia). ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2014; 33:199-207. [PMID: 24122868 DOI: 10.1002/etc.2417] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2013] [Revised: 09/23/2013] [Accepted: 09/27/2013] [Indexed: 06/02/2023]
Abstract
The objectives of the present study were to determine if the viability of freshwater mussel larvae (glochidia) is an ecologically relevant endpoint for toxicity tests and to define the appropriate duration of those tests. The authors assessed 1) how viability (the shell closure response to sodium chloride) compares with infectivity (ability to attach to a host fish and successfully metamorphose to the juvenile stage), and 2) the decline of viability and infectivity over time after glochidia were released from female mussels. Glochidia of 7 mussel species were isolated from females, placed in water, and subsampled daily for 2 d to 5 d. Viability, when ≥90%, was generally a good predictor of infectivity; however, when viability was <90%, infectivity was often disproportionately low, especially for glochidia collected near the end of the brooding period. Viability and infectivity declined more rapidly in natural water and sediment compared to reconstituted water. Following 24-h exposure to a toxicant (sodium chloride or copper), infectivity of the viable glochidia did not differ among concentrations of toxicants. The results indicate that viability is a valid proxy for infectivity and an ecologically relevant endpoint for standard toxicity tests with freshwater mussels for any test duration with control viability >90%.
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Chang CS, Huang SL, Chen S, Chen SN. Innate immune responses and efficacy of using mushroom beta-glucan mixture (MBG) on orange-spotted grouper, Epinephelus coioides, aquaculture. FISH & SHELLFISH IMMUNOLOGY 2013; 35:115-125. [PMID: 23603237 DOI: 10.1016/j.fsi.2013.04.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Revised: 03/08/2013] [Accepted: 04/04/2013] [Indexed: 06/02/2023]
Abstract
This study attempts to describe the effects of innate immunity responses and field application of mushroom beta-glucan mixture (MBG) in cultured orange-sported grouper, Epinephelus coioides. Chemical analysis for MBG showed that the mixture contains 34.06% of macro-molecular polymers with bio-active linkage such as 3-; 3,4- and 4,6-glucopyranosyl and 6-linked galactopyranosyl residues. Study performed on the innate immunity showed that oral ingestion of MBG at 1.0 g and 2.0 g per kilogram of feed levels may significantly enhance the lysozyme activity, alternative complement activity, phagocytic activity and respiration burst of the experimental groupers. Observation on the experimental challenge of pathogen showed that uses of MBG at 0.1% and 0.2% levels in feed might significantly enhance the protection of grouper against Vibrio alginolyticus. Field trials performed on short and long-term culture showed that feeding of diet containing 0.1% or 0.2% of MBG may significantly enhance the survival of cultured groupers up to 16% when compared with those obtained from controls.
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Affiliation(s)
- Ching-Sheng Chang
- Institute of Fisheries Science, National Taiwan University, Taipei, Taiwan
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15
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Newly Documented Host Fishes for the Eastern Elliptio Mussel Elliptio complanata. JOURNAL OF FISH AND WILDLIFE MANAGEMENT 2013. [DOI: 10.3996/102012-jfwm-094] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Abstract
The eastern elliptio Elliptio complanata is a common, abundant, and ecologically important freshwater mussel that occurs throughout the Atlantic Slope drainage in the United States and Canada. Previous research has shown E. complanata glochidia to be host fish generalists, parasitizing yellow perch Perca flavescens, banded killifish Fundulus diaphanus, banded sculpin Cottus carolinae, and seven centrarchid species. Past laboratory studies have been conducted in the Midwest; however, glochidia used in these studies were obtained from adult mussels in the Great Lakes or St. Lawrence River basins, or glochidia sources were not reported. The objective of this study was to identify host fishes for E. complanata from streams in the Mid-Atlantic region. We used artificial laboratory infections to test host suitability of 38 fish and 2 amphibian species with E. complanata glochidia from the Chesapeake Bay drainage. Glochidia successfully metamorphosed into juvenile mussels on five fish species: American eel Anguilla rostrata, brook trout Salvelinus fontinalis, lake trout Salvelinus namaycush, mottled sculpin Cottus bairdii, and slimy sculpin Cottus cognatus. American eel was the most effective host, yielding the highest overall metamorphosis success (percentage of attached glochidia that transformed into juvenile mussels; ≥0.90) and producing 13.2 juveniles per fish overall. No juvenile E. complanata metamorphosed on other fish or amphibian species tested, including many previously identified host fishes that appear in the literature. Reasons for discrepancies in published host fish could include geographic variation in host use across the species' range, differences in host use between lentic and lotic populations, or poorly resolved taxonomy within the genus Elliptio.
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Johnson JA, Wisniewski JM, Fritts AK, Bringolf RB. Host Identification and Glochidia Morphology of Freshwater Mussels from the Altamaha River Basin. SOUTHEAST NAT 2012. [DOI: 10.1656/058.011.0411] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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17
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Dubansky B, Whitaker B, Galvez F. Influence of cortisol on the attachment and metamorphosis of larval Utterbackia imbecillis on bluegill sunfish (Lepomis macrochirus). THE BIOLOGICAL BULLETIN 2011; 220:97-106. [PMID: 21551446 DOI: 10.1086/bblv220n2p97] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The larvae of unionid freshwater mussels (i.e., glochidia) undergo a parasitic stage requiring their attachment to the external epithelia of fish hosts, where they metamorphose into free-living juveniles. We describe the physiological effects in bluegill sunfish (Lepomis macrochirus) of infection with glochidia from the paper pondshell (Utterbackia imbecillis). Glochidia accumulation on bluegill increased dramatically at concentrations of 2000 glochidia liter(-1) and above, reaching a maximum attachment density of about 30 glochidia g(-1) fish at 4000 glochidia liter(-1). Plasma cortisol was the most sensitive indicator of biological effect to glochidial exposure, increasing significantly in hosts exposed to 2000 glochidia liter(-1) or greater. Glochidia were 31% more likely to undergo successful juvenile metamorphosis when attached to bluegill with elevated plasma cortisol, largely due to the enhanced survivorship of these larvae during the first 48 h after infection. We tested the hypothesis that glochidial attachment and juvenile metamorphosis were stimulated directly by plasma cortisol in fish hosts. Bluegill were given an intraperitoneal injection of cortisol, then infected with 1000 glochidia liter(-1) at 48 h after hormone supplementation. Cortisol-injected fish had a 42% increase in the number of attached glochidia g(-1) fish and a 28% increase in larval metamorphosis compared to sham-injected and control fish. We provide evidence that cortisol enhances glochidial metamorphosis on hosts by improving the retention of attached glochidia. This study gives insights into the influence of host physiology on glochidial attachment and juvenile mussel transformation.
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Affiliation(s)
- Benjamin Dubansky
- Department of Biological Sciences, Louisiana State University, Baton Rouge, 70803, USA
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18
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Barnhart MC, Haag WR, Roston WN. Adaptations to host infection and larval parasitism in Unionoida. ACTA ACUST UNITED AC 2008. [DOI: 10.1899/07-093.1] [Citation(s) in RCA: 232] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
| | - Wendell R. Haag
- Center for Bottomland Hardwoods Research, Southern Research Station, US Department of Agriculture Forest Service, 1000 Front St., Oxford, Mississippi 38655 USA
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Zanatta DT, Fraley SJ, Murphy RW. Population structure and mantle display polymorphisms in the wavy-rayed lampmussel, Lampsilis fasciola (Bivalvia: Unionidae). CAN J ZOOL 2007. [DOI: 10.1139/z07-089] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Genotypes from 10 polymorphic DNA microsatellite loci were used to make assessments of population structure, measurements of gene flow, and attempts to genetically segregate polymorphic host fish-attracting mantle displays for the wavy-rayed lampmussel, Lampsilis fasciola Rafinesque, 1820 — an endangered species in Canada. Specimens were collected from seven localities — six in the Great Lakes drainages of Ontario, Canada, and one from the Little Tennessee River in North Carolina, USA. Four distinct and sympatric mantle display morphologies were observed on female L. fasciola. Displays could not be distinguished genetically using analysis of molecular variance and genotypic assignment tests. The diversity of mantle displays was correlated with the overall genetic diversity observed among populations of L. fasciola. In managing populations of L. fasciola for propagation, augmentation, and translocation, polymorphic lures should be represented in proportion to what is observed in wild populations. Through moderately high FSTvalues and high assignment to population in genotype assignment tests, genetic structure was evident among the river drainages. Within-drainage gene flow was very high, and sampling localities within the Ontario drainages displayed panmixia. Efforts in artificial propagation and possible translocations to reintroduce or augment populations should be made to maintain the substantial levels of genetic variation while maintaining distinctiveness.
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Affiliation(s)
- David T. Zanatta
- Royal Ontario Museum, Department of Natural History, 100 Queen’s Park, Toronto, ON M5S 2C6, Canada
- North Carolina Wildlife Resources Commission, 50 Trillium Way, Clyde, NC 28721, USA
| | - Stephen J. Fraley
- Royal Ontario Museum, Department of Natural History, 100 Queen’s Park, Toronto, ON M5S 2C6, Canada
- North Carolina Wildlife Resources Commission, 50 Trillium Way, Clyde, NC 28721, USA
| | - Robert W. Murphy
- Royal Ontario Museum, Department of Natural History, 100 Queen’s Park, Toronto, ON M5S 2C6, Canada
- North Carolina Wildlife Resources Commission, 50 Trillium Way, Clyde, NC 28721, USA
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