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Van Der Spuy L, Erasmus JH, Nachev M, Schaeffner BC, Sures B, Wepener V, Smit NJ. The use of fish parasitic isopods as element accumulation indicators in marine pollution monitoring. Mar Pollut Bull 2023; 194:115385. [PMID: 37579706 DOI: 10.1016/j.marpolbul.2023.115385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 08/02/2023] [Accepted: 08/04/2023] [Indexed: 08/16/2023]
Abstract
Marine ecosystems are continuously under threat due to pollutants, which endanger marine biodiversity. The present study determines the potential use of the parasitic isopod, Cinusa tetrodontis Schjödte et Meinert, 1884, together with its fish host, Amblyrhynchotes honckenii (Bloch) for marine bioaccumulation monitoring. The concentrations of As, Cd, Cu, Mn, Ni, Pb, Se, and Zn were determined in muscle and liver tissues of infested and uninfested fish, and male and female parasites on the South African temperate south coast. The concentrations of Cu and Ni in C. tetrodontis differed significantly between two sampling sites, a near-pristine (Breede River Estuary, Witsand) and a more polluted site (harbour area in Mossel Bay). Mossel Bay isopods had higher concentrations of Ni, while Witsand isopods had higher concentrations of Cu. In contrast to fish hosts, parasitic isopods accumulated significantly higher levels of all elements except Cd. Most significant relationships between elements accumulated by C. tetrodontis and an increase of elements in fish tissues were seen in liver, rather than muscle tissue samples. Specimens of C. tetrodontis can be defined as good bioindicators for elements such as As, Cu, Mn, Ni, Pb, Se, and Zn, as they possess high bioaccumulation capabilities. This study addresses one of several future directions needed within environmental parasitology and highlights the importance of studying and utilising this host-ectoparasite model system.
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Affiliation(s)
- L Van Der Spuy
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman Street, Potchefstroom 2520, South Africa.
| | - J H Erasmus
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman Street, Potchefstroom 2520, South Africa.
| | - M Nachev
- Department of Aquatic Ecology and Centre for Water and Environmental Research, University of Duisburg-Essen, Universitätsstrasse 5, 45141 Essen, Germany.
| | - B C Schaeffner
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman Street, Potchefstroom 2520, South Africa; Institute for Experimental Pathology at Keldur, University of Iceland, Keldnavegur 3, 112 Reykjavík, Iceland.
| | - B Sures
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman Street, Potchefstroom 2520, South Africa; Department of Aquatic Ecology and Centre for Water and Environmental Research, University of Duisburg-Essen, Universitätsstrasse 5, 45141 Essen, Germany; Research Center One Health Ruhr, Research Alliance Ruhr, University of Duisburg-Essen, Universitätsstrasse 5, 45141 Essen, Germany.
| | - V Wepener
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman Street, Potchefstroom 2520, South Africa.
| | - N J Smit
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman Street, Potchefstroom 2520, South Africa.
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van Rooyen D, Erasmus JH, Gerber R, Nachev M, Sures B, Wepener V, Smit NJ. Bioaccumulation and trophic transfer of total mercury through the aquatic food webs of an African sub-tropical wetland system. Sci Total Environ 2023; 889:164210. [PMID: 37196965 DOI: 10.1016/j.scitotenv.2023.164210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 04/24/2023] [Accepted: 05/12/2023] [Indexed: 05/19/2023]
Abstract
Anthropogenic activities, including combustion of fossil fuels, coal, and gold mining, are significant sources of mercury (Hg) emissions into aquatic ecosystems. South Africa is a major contributor to global Hg emissions (46.4 tons Hg in 2018), with coal-fired power stations as the main source. Atmospheric transport of Hg emissions is the dominant cause of contamination, especially in the east coast of southern Africa where the Phongolo River Floodplain (PRF) is located. The PRF is the largest floodplain system in South Africa, with unique wetlands and high biodiversity, and provides essential ecosystem services to local communities who rely on fish as a protein source. We assessed the bioaccumulation of Hg in various biota, the trophic positions and food webs, as well as the biomagnification of Hg through the food webs from the PRF. Elevated Hg concentrations were found in sediments, macroinvertebrates and fish from the main rivers and associated floodplains in the PRF. Mercury biomagnification was observed through the food webs, with the apex predator tigerfish, Hydrocynus vittatus, having the highest Hg concentration. Our study shows that Hg in the PRF is bioavailable, accumulates in biota and biomagnifies in food webs.
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Affiliation(s)
- D van Rooyen
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom, South Africa
| | - J H Erasmus
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom, South Africa.
| | - R Gerber
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom, South Africa
| | - M Nachev
- Department of Aquatic Ecology and Centre for Water and Environmental Research, University of Duisburg-Essen, Essen, Germany.
| | - B Sures
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom, South Africa; Department of Aquatic Ecology and Centre for Water and Environmental Research, University of Duisburg-Essen, Essen, Germany; Research Center One Health Ruhr, Research Alliance Ruhr, University of Duisburg-Essen, Germany.
| | - V Wepener
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom, South Africa.
| | - N J Smit
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom, South Africa.
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Erasmus JH, Smit NJ, Gerber R, Schaeffner BC, Nkabi N, Wepener V. Total mercury concentrations in sharks, skates and rays along the South African coast. Mar Pollut Bull 2022; 184:114142. [PMID: 36182787 DOI: 10.1016/j.marpolbul.2022.114142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 09/11/2022] [Accepted: 09/13/2022] [Indexed: 06/16/2023]
Abstract
Global declines in elasmobranch populations resulting from several stressors raises conservation concern. Additionally, apex predators bioaccumulate high concentrations of total mercury (THg), due to biomagnification. Although South Africa is considered one of the top ten contributors of Hg emissions globally, information on Hg concentrations in elasmobranchs is limited. The aim of this study was to evaluate the THg concentrations in 22 species of elasmobranchs along the South African coastline. Concentrations ranged between 0.22 and 5.8 mg/kg in Haploblepharus pictus (dark shysharks) and Rostroraja alba (white skates) on the south coast, respectively. Along the east coast it ranged between 0.21 and 17.8 mg/kg in Mobula kuhlii (shortfin devil rays) and Sphyrna lewini (scalloped hammerheads), respectively. Mercury concentrations on the east coast were in the same range or higher compared to the same species sampled between 2005-10 from the same region, with generally higher concentrations compared to the same species sampled globally.
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Affiliation(s)
- J H Erasmus
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman Street, Potchefstroom 2520, South Africa.
| | - N J Smit
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman Street, Potchefstroom 2520, South Africa.
| | - R Gerber
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman Street, Potchefstroom 2520, South Africa; South African Shark Conservancy, Old Harbour, 22 Marine Drive, Hermanus 7200, South Africa.
| | - B C Schaeffner
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman Street, Potchefstroom 2520, South Africa; South African Shark Conservancy, Old Harbour, 22 Marine Drive, Hermanus 7200, South Africa; Institute for Experimental Pathology at Keldur, University of Iceland, Keldnavegur 3, 112 Reykjavík, Iceland.
| | - N Nkabi
- KwaZulu-Natal Sharks Board, 1a Herrwood Drive, Umhlanga Rocks 4320, South Africa.
| | - V Wepener
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman Street, Potchefstroom 2520, South Africa.
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Erasmus JH, Zimmermann S, Smit NJ, Malherbe W, Nachev M, Sures B, Wepener V. Human health risks associated with consumption of fish contaminated with trace elements from intensive mining activities in a peri-urban region. Sci Total Environ 2022; 825:154011. [PMID: 35192810 DOI: 10.1016/j.scitotenv.2022.154011] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 02/15/2022] [Accepted: 02/15/2022] [Indexed: 06/14/2023]
Abstract
Worldwide, numerous rural communities and low-income groups depend on fish harvested by subsistence fishers from local rivers and its impoundments as a source of protein. The aim of the present study was to determine the trace element bioaccumulation (As, Cd, Cr, Cu, Ni, Pb, Pt, Zn) in three edible fish species (Cyprinus carpio, Clarias gariepinus, Oreochromis mossambicus) from two impoundments in the Hex River system, South Africa, as well as the chronic health risk these trace elements pose to regular fish consumers. Trace element concentrations in the Hex River are naturally high (geogenic source), however, increased anthropogenic activities, such as intensive platinum mining activities, elevate the already high background concentrations. Concentrations of As, Cr, and Pt in C. carpio and C. gariepinus, as well as Ni and Zn in O. mossambicus were significantly higher in the impacted impoundment as compared to the reference impoundment. Concentrations of Cr and Cu were at both sampling sites the highest in O. mossambicus. From the human health risk assessment, As poses non-carcinogenic (HQ = 2-7) and carcinogenic risks (33-93 out of 10,000 people), while Cr (3-10 out of 10,000 people) and Ni (2-6 out of 10,000 people) pose only carcinogenic risks for the regular consumption of all three fish species from both impoundments, indicating a high probability of adverse human health effects. For As, Cr and Ni, also the sediment concentrations exceeded the levels of concern within the consensus based sediment quality guideline (CBSQG), while Cd, Cu, Ni and Zn exceeded the water quality guideline values. Thus, the CBSQG approach could be a promising tool for predicting human health risk associated with fish consumption. Since the present study only focused on the individual trace element risks, mixed toxicity of these trace elements and possible other pollutants within these fish species may pose an even greater risk to people who consume these fish regularly.
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Affiliation(s)
- J H Erasmus
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman St, Potchefstroom, 2520, South Africa.
| | - S Zimmermann
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman St, Potchefstroom, 2520, South Africa; Department of Aquatic Ecology and Centre for Water and Environmental Research, University of Duisburg-Essen, Universitätsstr. 5, Essen 45141, Germany.
| | - N J Smit
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman St, Potchefstroom, 2520, South Africa.
| | - W Malherbe
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman St, Potchefstroom, 2520, South Africa.
| | - M Nachev
- Department of Aquatic Ecology and Centre for Water and Environmental Research, University of Duisburg-Essen, Universitätsstr. 5, Essen 45141, Germany.
| | - B Sures
- Department of Aquatic Ecology and Centre for Water and Environmental Research, University of Duisburg-Essen, Universitätsstr. 5, Essen 45141, Germany.
| | - V Wepener
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman St, Potchefstroom, 2520, South Africa.
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de Necker L, Manfrin A, Ikenaka Y, Ishizuka M, Brendonck L, van Vuren JHJ, Sures B, Wepener V, Smit NJ. Using stable δ13C and δ15N isotopes to assess foodweb structures in an African subtropical temporary pool. African Zoology 2020. [DOI: 10.1080/15627020.2020.1731331] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- L de Necker
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
| | - A Manfrin
- Environmental Campus Birkenfeld, University of Applied Sciences Tier, Standort Umwelt-Campus Birkenfeld, Germany
- Department of Aquatic Ecology and Centre for Water and Environmental Research (ZWU), University of Duisburg-Essen, Essen, Germany
| | - Y Ikenaka
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - M Ishizuka
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - L Brendonck
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
- Animal Ecology, Global Change and Sustainable Development, Department of Biology, University of Leuven, Leuven, Belgium
| | - JHJ van Vuren
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
| | - B Sures
- Department of Aquatic Ecology and Centre for Water and Environmental Research (ZWU), University of Duisburg-Essen, Essen, Germany
| | - V Wepener
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
| | - NJ Smit
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
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Dube T, de Necker L, Wepener V, Smit NJ, Pinceel T, Mwaijengo GN, Lemmens P, Brendonck L. A comparison of aquatic macroinvertebrate and large branchiopod community composition between temporary pans of a conservation area and surrounding communal area in South Africa. African Zoology 2020. [DOI: 10.1080/15627020.2020.1724827] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- T Dube
- Animal Ecology, Global Change and Sustainable Development, Leuven, Belgium
- Department of Applied Biosciences and Biotechnology, Midlands State University, Gweru, Zimbabwe
| | - L de Necker
- Water Research Group, School for Biological Sciences, North-West University, Potchefstroom, South Africa
| | - V Wepener
- Water Research Group, School for Biological Sciences, North-West University, Potchefstroom, South Africa
| | - NJ Smit
- Water Research Group, School for Biological Sciences, North-West University, Potchefstroom, South Africa
| | - T Pinceel
- Animal Ecology, Global Change and Sustainable Development, Leuven, Belgium
- Centre for Environmental Management, University of the Free State, Bloemfontein, South Africa
| | - GN Mwaijengo
- Animal Ecology, Global Change and Sustainable Development, Leuven, Belgium
- School of Materials, Energy, Water and Environmental Sciences, Nelson Mandela Institute, Arusha, Tanzania
| | - P Lemmens
- Laboratory of Aquatic Ecology, Evolution and Conservation, Leuven, Belgium
| | - L Brendonck
- Animal Ecology, Global Change and Sustainable Development, Leuven, Belgium
- Water Research Group, School for Biological Sciences, North-West University, Potchefstroom, South Africa
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Erasmus JH, Malherbe W, Zimmermann S, Lorenz AW, Nachev M, Wepener V, Sures B, Smit NJ. Metal accumulation in riverine macroinvertebrates from a platinum mining region. Sci Total Environ 2020; 703:134738. [PMID: 31731169 DOI: 10.1016/j.scitotenv.2019.134738] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 09/27/2019] [Accepted: 09/28/2019] [Indexed: 06/10/2023]
Abstract
South Africa is the world's main supplier of Pt. The Bushveld Igneous Complex in South Africa contains 75% of the world's Pt resources. Mining of this precious metal requires large volumes of water for production and removal of waste products. Most of this wastewater is discharged into river systems. Although the source of contamination with Pt in aquatic systems due to mining activities is known, little to no information is available about the impact of Pt on aquatic organisms. Additionally, other metals are released as byproducts of Pt mining, which might also be discharged into the environment. Therefore, concentrations of Cr, Ni, Cu, Zn, Cd, Pt and Pb were determined in water, sediment and macroinvertebrate samples from a reference site (Site 1), a highly impacted site (Site 2) and a moderately impacted site (Site 3) along the Hex River, South Africa. Aquatic invertebrate families representing different functional feeding groups i.e. scraper-grazers (Lymnaeidae), collector-gatherers (Potamonautidae, Hydropsychidae, Tubificidae and Chironomidae), shredders (Baetidae) and predators (Coenagrionidae and Libellulidae) were studied. In the sediments, the concentrations of Cr and Pt were significantly higher at Site 2 than at Sites 1 and 3, respectively, whereas concentrations of Ni, Cu, Cd, and Pb showed no significant differences between the sites. Depending on the metal, the aquatic invertebrate families showed different grades of bioaccumulation. The results from especially Lymnaeidae, Baetidae, Tubificidae and Chironomidae showed great promise for the use of these taxa for biomonitoring of metal contaminations. The macroinvertebrates accumulated metals associated with Pt mining, with epi-benthic dwelling taxa (Tubificidae) accumulating higher concentrations of Pt and Cr than other families (e.g. Potamonautidae, Coenagrionidae and Lymnaeidae). These results provide valuable information on the behavior of metals related to Pt mining in aquatic ecosystems and therefore can contribute to the risk assessment of these intensive mining activities.
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Affiliation(s)
- J H Erasmus
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman St, Potchefstroom 2520, South Africa.
| | - W Malherbe
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman St, Potchefstroom 2520, South Africa.
| | - S Zimmermann
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman St, Potchefstroom 2520, South Africa; Department of Aquatic Ecology and Centre for Water and Environmental Research, University of Duisburg-Essen, Universitätsstr. 5, Essen 45141, Germany.
| | - A W Lorenz
- Department of Aquatic Ecology and Centre for Water and Environmental Research, University of Duisburg-Essen, Universitätsstr. 5, Essen 45141, Germany.
| | - M Nachev
- Department of Aquatic Ecology and Centre for Water and Environmental Research, University of Duisburg-Essen, Universitätsstr. 5, Essen 45141, Germany.
| | - V Wepener
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman St, Potchefstroom 2520, South Africa.
| | - B Sures
- Department of Aquatic Ecology and Centre for Water and Environmental Research, University of Duisburg-Essen, Universitätsstr. 5, Essen 45141, Germany.
| | - N J Smit
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman St, Potchefstroom 2520, South Africa.
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Volschenk CM, Gerber R, Mkhonto MT, Ikenaka Y, Yohannes YB, Nakayama S, Ishizuka M, van Vuren JHJ, Wepener V, Smit NJ. Bioaccumulation of persistent organic pollutants and their trophic transfer through the food web: Human health risks to the rural communities reliant on fish from South Africa's largest floodplain. Sci Total Environ 2019; 685:1116-1126. [PMID: 31390702 DOI: 10.1016/j.scitotenv.2019.06.144] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 06/04/2019] [Accepted: 06/09/2019] [Indexed: 06/10/2023]
Affiliation(s)
- C M Volschenk
- Department of Zoology, Kingsway Campus, University of Johannesburg, PO Box 524, Auckland Park 2006, South Africa
| | - R Gerber
- Unit for Environmental Sciences and Management, Potchefstroom Campus, North-West University, X6001, Potchefstroom 2520, South Africa.
| | - M T Mkhonto
- Department of Zoology, Kingsway Campus, University of Johannesburg, PO Box 524, Auckland Park 2006, South Africa
| | - Y Ikenaka
- Unit for Environmental Sciences and Management, Potchefstroom Campus, North-West University, X6001, Potchefstroom 2520, South Africa; Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, N18, W9, Kita-ku, Sapporo 060-0818, Japan
| | - Y B Yohannes
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, N18, W9, Kita-ku, Sapporo 060-0818, Japan; Department of Chemistry, College of Natural and Computational Sciences, University of Gondar, P.O. Box 196, Gondar, Ethiopia
| | - S Nakayama
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, N18, W9, Kita-ku, Sapporo 060-0818, Japan
| | - M Ishizuka
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, N18, W9, Kita-ku, Sapporo 060-0818, Japan
| | - J H J van Vuren
- Department of Zoology, Kingsway Campus, University of Johannesburg, PO Box 524, Auckland Park 2006, South Africa; Unit for Environmental Sciences and Management, Potchefstroom Campus, North-West University, X6001, Potchefstroom 2520, South Africa
| | - V Wepener
- Unit for Environmental Sciences and Management, Potchefstroom Campus, North-West University, X6001, Potchefstroom 2520, South Africa; Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, N18, W9, Kita-ku, Sapporo 060-0818, Japan
| | - N J Smit
- Unit for Environmental Sciences and Management, Potchefstroom Campus, North-West University, X6001, Potchefstroom 2520, South Africa
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Malherbe W, Christison KW, Wepener V, Smit NJ. Epizootic ulcerative syndrome - First report of evidence from South Africa's largest and premier conservation area, the Kruger National Park. Int J Parasitol Parasites Wildl 2019; 10:207-210. [PMID: 31667083 PMCID: PMC6812056 DOI: 10.1016/j.ijppaw.2019.08.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2019] [Revised: 08/26/2019] [Accepted: 08/27/2019] [Indexed: 11/16/2022]
Abstract
This study reports on the first evidence of genomic material of the causative agent for epizootic ulcerative syndrome (EUS), Aphanomyces invadans, from fish in the Limpopo River system and the Kruger National Park, South Africa. Fourteen fish species were collected from various depressions in the floodplains of the Limpopo and Luvuvhu Rivers in the Makuleke Wetlands during 2015 and 2017. A single individual of Clarias gariepinus was found to have a suspected epizootic ulcerative syndrome (EUS) lesion. Samples were collected and evidence of A. invadans DNA in the samples was found through PCR and amplicon sequencing. The spread of EUS into this premier conservation area is of concern as it could potentially spread across borders and into other naïve river systems with important conservation statuses. First evidence of genomic material of Aphanomyces invadans from the Limpopo River. Incidental discovery of A. invadans on Clarias gariepinus in the Makuleke Wetlands. Little information known about the distribution of EUS in northern South Africa.
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Affiliation(s)
- W Malherbe
- Water Research Group, Unit for Environmental Sciences and Management, Potchefstroom Campus, North-West University, Private Bag X6001, Potchefstroom, 2520, South Africa
| | - K W Christison
- Department of Agriculture Forestry and Fisheries, Private Bag X2, Roggebaai, 8012, South Africa.,Biodiversity and Conservation Biology, University of the Western Cape, Bellville, South Africa
| | - V Wepener
- Water Research Group, Unit for Environmental Sciences and Management, Potchefstroom Campus, North-West University, Private Bag X6001, Potchefstroom, 2520, South Africa
| | - N J Smit
- Water Research Group, Unit for Environmental Sciences and Management, Potchefstroom Campus, North-West University, Private Bag X6001, Potchefstroom, 2520, South Africa
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10
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Gerber R, Smit NJ, van Vuren JHJ, Ikenaka Y, Wepener V. Biomarkers in tigerfish (Hydrocynus vittatus) as indicators of metal and organic pollution in ecologically sensitive subtropical rivers. Ecotoxicol Environ Saf 2018; 157:307-317. [PMID: 29627415 DOI: 10.1016/j.ecoenv.2018.03.091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Revised: 03/19/2018] [Accepted: 03/30/2018] [Indexed: 06/08/2023]
Abstract
Studies have shown high levels of contamination of both metals and organochlorine pesticides (OCPs) in aquatic systems of the world renowned Kruger National Park, South Africa. With effects evident in top predators, including, unexplained Crocodylus niloticus deaths and organ level and histological changes in Hydrocynus vittatus. A suite of biomarkers reflecting exposure and were selected to evaluate biological responses of H. vittatus to anthropogenic stressors as well as to evaluate whether the chosen suite of biomarkers could successfully distinguish between the different pollution profiles present in the selected rivers. During this study a clear relationship was found between exposure to environmental contaminants and the concomitant responses of H. vittatus to these stressors. The ensuing biomarker responses indicated that there is a physiological attempt to deal with, and mitigate the deleterious effects that metals and OCPs may induce. In the Luvuvhu River there is a clear indication in H. vittatus of the stimulation of anti-oxidant protective mechanisms in response to internal OCP exposure. This is reflected by the increasing cytochrome P-450, superoxide dismutase, and more specifically reduced glutathione, which resulted in decreased lipid and protein breakdown (reflected in decreased lipid peroxidation and protein carbonyl levels). Consequently H. vittatus populations of the Luvuvhu River are under greater cumulative stress and this is reflected in the lower energy budgets. Our results further show the integrated application value of the current suite of biomarkers in assessing responses of subtropical fish to metal and OCP exposure as the entire suite of biomarkers when used in conjunction were able to explain 100% of the variation in the data.
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Affiliation(s)
- R Gerber
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom 2520, South Africa
| | - N J Smit
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom 2520, South Africa
| | - Johan H J van Vuren
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom 2520, South Africa
| | - Y Ikenaka
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom 2520, South Africa; Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Kita 18, Nishi 9, Kita-ku, Sapporo 060-0818, Japan
| | - Victor Wepener
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom 2520, South Africa
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11
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Thompson LA, Ikenaka Y, Yohannes YB, Ichise T, Ito G, Bortey-Sam N, van Vuren JJ, Wepener V, Smit NJ, Darwish WS, Nakayama SMM, Mizukawa H, Ishizuka M. Human Health Risk from Consumption of Marine Fish Contaminated with DDT and Its Metabolites in Maputo Bay, Mozambique. Bull Environ Contam Toxicol 2018; 100:672-676. [PMID: 29546500 DOI: 10.1007/s00128-018-2323-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Accepted: 03/12/2018] [Indexed: 06/08/2023]
Abstract
Many countries with incidence of malaria, including those surrounding Maputo Bay, use dichloro-diphenyl-trichloroethane (DDT) to reduce mosquitoes. This study is the first to estimate the human health risk associated with consumption of marine fish from Maputo Bay contaminated with DDTs. The median for ∑DDTs was 3.8 ng/g ww (maximum 280.9 ng/g ww). The overall hazard ratio for samples was 1.5 at the 75th percentile concentration and 28.2 at the 95th percentile. These calculations show increased potential cancer risks due to contamination by DDTs, data which will help policy makers perform a risk-benefit analysis of DDT use in malaria control programs in the region.
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Affiliation(s)
- L A Thompson
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - Y Ikenaka
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
| | - Y B Yohannes
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
- Department of Chemistry, College of Natural and Computational Science, University of Gondar, Gondar, Ethiopia
| | - T Ichise
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - G Ito
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - N Bortey-Sam
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - J J van Vuren
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
| | - V Wepener
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
| | - N J Smit
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
| | - W S Darwish
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
- Food Control Department, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
| | - S M M Nakayama
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - H Mizukawa
- Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - M Ishizuka
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan.
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12
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Přikrylová I, Smit NJ, Gelnar M. Description of Afrogyrodactylus ardae sp. n. (Monogenea: Gyrodactylidae) from Rhabdalestes septentrionalis (Characiformes: Alestidae) in the Niokolo-Koba National Park, Senegal. Helminthologia 2017. [DOI: 10.1515/helm-2017-0045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Summary
The monogenean, Afrogyrodactylus ardae sp. n., is described from the African tetra, Rhadbalestes septentrionalis (Characiformes: Alestidae), collected from the Niokolo Koba and Gambie Rivers in the Niokolo-Koba National Park, Senegal during 2008. The newly described species can be differentiated from three known species of the genus based on the dimensions of its opisthaptoral hard parts, having the smallest ones, and based on the shape of the marginal hooks sickle. The present finding represents a new host record for the genus Afrogyrodactylus.
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Affiliation(s)
- I. Přikrylová
- Department of Botany and Zoology, Faculty of Science , Masaryk University , Brno , Czech Republic
- Water Research Group, Unit for Environmental Sciences and Management, Potchefstroom Campus , North-West University , Potchefstroom , South Africa
- Department of Biodiversity , University of Limpopo , Sovenga, South Africa
| | - N. J. Smit
- Water Research Group, Unit for Environmental Sciences and Management, Potchefstroom Campus , North-West University , Potchefstroom , South Africa
| | - M. Gelnar
- Department of Botany and Zoology, Faculty of Science , Masaryk University , Brno , Czech Republic
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13
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Thompson LA, Ikenaka Y, Yohannes YB, van Vuren JJ, Wepener V, Smit NJ, Darwish WS, Nakayama SMM, Mizukawa H, Ishizuka M. Concentrations and human health risk assessment of DDT and its metabolites in free-range and commercial chicken products from KwaZulu-Natal, South Africa. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2017; 34:1959-1969. [DOI: 10.1080/19440049.2017.1357209] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- L. A. Thompson
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - Y. Ikenaka
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
| | - Y. B. Yohannes
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
- Department of Chemistry, College of Natural and Computational Science, University of Gondar, Gondar, Ethiopia
| | - J. J. van Vuren
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
- Department of Zoology, University of Johannesburg, Johannesburg, South Africa
| | - V. Wepener
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
| | - N. J. Smit
- Water Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
| | - W. S. Darwish
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
- Food Control Department, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
| | - S. M. M. Nakayama
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - H. Mizukawa
- Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - M. Ishizuka
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
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14
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McHugh KJ, Weyl OLF, Smit NJ. Parasite diversity of African longfin eel Anguilla mossambica Peters with comments on host response to the monogenean Pseudodactylogyrus anguillae (Yin and Sproston). J Fish Dis 2017; 40:959-961. [PMID: 27723106 DOI: 10.1111/jfd.12560] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Revised: 08/22/2016] [Accepted: 08/22/2016] [Indexed: 06/06/2023]
Affiliation(s)
- K J McHugh
- Water Research Group (Ecology), Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
- South African Institute for Aquatic Biodiversity, Grahamstown, South Africa
| | - O L F Weyl
- South African Institute for Aquatic Biodiversity, Grahamstown, South Africa
| | - N J Smit
- Water Research Group (Ecology), Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
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15
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Soekoe M, van der Bank FH, Smit NJ. Determining the most suitable method of otolith preparation for estimating the age of tigerfish, Hydrocynus vittatus in the Pongolapoort Dam, South Africa. African Zoology 2015. [DOI: 10.1080/15627020.2013.11407582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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16
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O'Brien GC, Jacobs F, Evans SW, Smit NJ. First observation of African tigerfish Hydrocynus vittatus predating on barn swallows Hirundo rustica in flight. J Fish Biol 2014; 84:263-266. [PMID: 24354922 DOI: 10.1111/jfb.12278] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Accepted: 10/14/2013] [Indexed: 06/03/2023]
Abstract
A population of African tigerfish Hydrocynus vittatus from the Schroda Dam, actively prey on barn swallows Hirundo rustica in flight. This behaviour was discovered during a radio telemetry study and documented using a motion picture video camera. These results show that an avivorous diet is a part of the feeding biology of H. vittatus, and may occur in other populations.
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Affiliation(s)
- G C O'Brien
- Water Research Group (Ecology), Unit of Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom, 2520, South Africa
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17
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McHugh KJ, Van Dyk JC, Weyl OLF, Smit NJ. First report of nephrocalcinosis in a wild population of Mugil cephalus L. and Myxus capensis (Valenciennes). J Fish Dis 2013; 36:887-889. [PMID: 23496659 DOI: 10.1111/jfd.12101] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Revised: 02/04/2013] [Accepted: 02/09/2013] [Indexed: 06/01/2023]
Affiliation(s)
- K J McHugh
- Water Research Group (Ecology), Unit for Environmental Sciences and Management, North West University, Potchefstroom, South Africa
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18
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Hayes PM, Smit NJ, Grutter AS, Davies AJ. Unexpected response of a captive blackeye thicklip, Hemigymnus melapterus (Bloch), from Lizard Island, Australia, exposed to juvenile isopods Gnathia aureamaculosa Ferreira & Smit. J Fish Dis 2011; 34:563-566. [PMID: 21623834 DOI: 10.1111/j.1365-2761.2011.01261.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Affiliation(s)
- P M Hayes
- School of Life Sciences, Kingston University, Kingston upon Thames, Surrey, UK
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19
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Cook CA, Smit NJ, Davies AJ. Hemoproteids (Apicomplexa: Haemoproteidae) from South African tortoises (Cryptodira: Testudinidae). J Parasitol 2010; 96:1168-72. [PMID: 21158631 DOI: 10.1645/ge-2527.1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Terrestrial tortoises, Chersina angulata (Schweigger, 1812), Kinixys belliana belliana Gray, 1831, K. lobatsiana Power, 1927, K. natalensis Hewitt, 1935, and Stigmochelys pardalis (Bell, 1828), both wild (n = 84) and captive (n = 70), were examined for hematozoans from the provinces of Gauteng, Kwazulu-Natal, North West, and Western Cape, South Africa. In Giemsa-stained blood films, 2 species of hemoproteids were identified, 1 previously described, that is, Haemoproteus testudinalis ( Laveran, 1905 ) Wenyon, 1915, the other unknown. Haemoproteus testudinalis occurred in 2/27 wild K. lobatsiana and 1/41 S. pardalis and 2/2 captive K. lobatsiana from the North West and Gauteng, respectively, whereas Haemoproteus sp. A was recorded in 1 of 3 captive K. natalensis from Kwazulu-Natal. Haemoproteus testudinalis had pale blue-stained, often vacuolated, halteridial macrogametocytes, pale pink-stained microhalterdial to halteridial microgametocytes, and dark, scattered, often bacillus-like hemozoin granules. Haemoproteus natalensis n. sp. had ameboid growth stages, blue-stained halteridial to circumnuclear macrogametocytes, purple-stained circumnuclear microgametocytes, and brownish, often clustered, pigment granules. It is recommended that Haemoproteus balazuci Dias, 1953, become a junior synonym of H. testudinalis.
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Affiliation(s)
- C A Cook
- Department of Zoology, University of Johannesburg, Johannesburg, South Africa
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20
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Hayes PM, Smit NJ, Davies AJ. Pathology associated with parasitic juvenile gnathiids feeding on the puffadder shyshark, Haploblepharus edwardsii (Voight). J Fish Dis 2007; 30:55-8. [PMID: 17241405 DOI: 10.1111/j.1365-2761.2007.00777.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Affiliation(s)
- P M Hayes
- School of Life Sciences, Kingston University, Kingston upon Thames, Surrey, UK
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21
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Abstract
Isopods of the family Gnathiidae have free-living adults and parasitic juveniles feeding on the blood and tissue fluids of teleost and elasmobranch fishes. When not feeding on fishes, gnathiids are cryptic and widely distributed, especially among marine habitats. Ten genera are recognized: Bathygnathia, Bythognathia, Caecognathia, Elaphognathia, Euneognathia, Gibbagnathia, Gnathia, Monodgnathia, Paragnathia and Thaumastognathia. Among these are 172 known species, the majority in the genus Gnathia. Species descriptions rely on the morphology of adult male gnathiids. When juveniles or females are found, their identification can be difficult, a problem discussed in this review. Several gnathiids adapt well to laboratory culture and life cycles are generally similar, although variations in moulting behaviour, length of cycle and harem formation are observed. Praniza larvae are the feeding stages, and their mouthparts and digestion processes are examined. The effects of feeding on fishes in aquaria, in fisheries and in the wild are reported, and the role of gnathiids as vectors is assessed. Ecological interactions between gnathiid larvae, client and cleaner fishes are summarized. Identification of juveniles, host-finding behaviour, feeding and the digestion processes in larvae, feeding cycles among gnathiids of elasmobranchs, and the role of gnathiids as vectors, are among areas highlighted for further study.
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Affiliation(s)
- N J Smit
- Department of Zoology, Rand Afrikaans University, P.O. Box 524, Auckland Park 2006, South Africa
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22
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Abstract
Haemogregarina bigemina Laveran et Mesnil, 1901 was examined in marine fishes and the gnathiid isopod, Gnathia africana Barnard, 1914 in South Africa. Its development in fishes was similar to that described previously for this species. Gnathiids taken from fishes with H. bigemina, and prepared sequentially over 28 days post feeding (d.p.f.), contained stages of syzygy, immature and mature oocysts, sporozoites and merozoites of at least three types. Sporozoites, often five in number, formed from each oocyst from 9 d.p.f. First-generation merozoites appeared in small numbers at 11 d.p.f., arising from small, rounded meronts. Mature, second-generation merozoites appeared in large clusters within gut tissue at 18 d.p.f. They were presumed to arise from fan-shaped meronts, first observed at 11 d.p.f. Third-generation merozoites were the shortest, and resulted from binary fission of meronts, derived from second-generation merozoites. Gnathiids taken from sponges within rock pools contained only gamonts and immature oocysts. It is concluded that the development of H. bigemina in its arthropod host illustrates an affinity with Hemolivia and one species of Hepatozoon. However, the absence of sporokinctes and sporocysts also distances it from these genera, and from Karyolysus. Furthermore, H. bigemina produces fewer sporozoites than Cyrilia and Desseria, although, as in Desseria, Haemogregarina (sensu stricto) and Babesiosoma, post-sporogonic production of merozoites occurs in the invertebrate host. The presence of intraerythrocytic binary fission in its fish host means that H. bigemina is not a Desseria. Overall it most closely resembles Haemogregarina (sensu stricto) in its development, although the match is not exact.
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Affiliation(s)
- A J Davie
- School of Life Sciences, Faculty of Science, Kingston University, Kingston upon Thames, Surrey, UK.
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23
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Abstract
A new species, Gnathia nkulu sp. n. is described from material collected off the South African coast at 80-200m depth. It differs from the intertidal species Gnathia africana Barnard, 1914 in that the mediofrontal process is not deeply divided into two lobes, article 2 of the pylopod is rounded and small wart-like tubercles and long simple setae are present on both the cephalosome and pereon.
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Affiliation(s)
- N J Smit
- Department of Zoology and Entomology, University of the Free State, Bloemfontein, South Africa.
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24
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Smit NJ, Basson L, Van As JG. A redescription of the adult male of Caecognathia cryptopais (Barnard, 1925) (Crustacea: Isopoda: Gnathiidae) from southern Africa. Folia Parasitol (Praha) 2000; 47:61-6. [PMID: 10833018 DOI: 10.14411/fp.2000.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A redescription of the adult male of Caecognathia cryptopais (Barnard, 1925) is provided from syntypes and other material deposited in the South African Museum. The generic status of Caecognathia cryptopais is also revised. This redescription is based on light and scanning electron microscopy.
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Affiliation(s)
- N J Smit
- Department of Zoology and Entomology, University of the Free State, Bloemfontein, South Africa.
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