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Coughlan NE, Cunningham EM, Cuthbert RN, Joyce PWS, Anastácio P, Banha F, Bonel N, Bradbeer SJ, Briski E, Butitta VL, Čadková Z, Dick JTA, Douda K, Eagling LE, Ferreira‐Rodríguez N, Hünicken LA, Johansson ML, Kregting L, Labecka AM, Li D, Liquin F, Marescaux J, Morris TJ, Nowakowska P, Ożgo M, Paolucci EM, Peribáñez MA, Riccardi N, Smith ERC, Spear MJ, Steffen GT, Tiemann JS, Urbańska M, Van Doninck K, Vastrade M, Vong GYW, Wawrzyniak‐Wydrowska B, Xia Z, Zeng C, Zhan A, Sylvester F. Biometric conversion factors as a unifying platform for comparative assessment of invasive freshwater bivalves. J Appl Ecol 2021. [DOI: 10.1111/1365-2664.13941] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Blackwell T, Ford AGP, Ciezarek AG, Bradbeer SJ, Gracida Juarez CA, Smith AM, Ngatunga BP, Shechonge A, Tamatamah R, Etherington G, Haerty W, Di Palma F, Turner GF, Genner MJ. Newly discovered cichlid fish biodiversity threatened by hybridization with non-native species. Mol Ecol 2020; 30:895-911. [PMID: 33063411 DOI: 10.1111/mec.15638] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Accepted: 08/24/2020] [Indexed: 12/24/2022]
Abstract
Invasive freshwater fishes are known to readily hybridize with indigenous congeneric species, driving loss of unique and irreplaceable genetic resources. Here we reveal that newly discovered (2013-2016) evolutionarily significant populations of Korogwe tilapia (Oreochromis korogwe) from southern Tanzania are threatened by hybridization with the larger invasive Nile tilapia (Oreochromis niloticus). We use a combination of morphology, microsatellite allele frequencies and whole genome sequences to show that O. korogwe from southern lakes (Nambawala, Rutamba and Mitupa) are distinct from geographically disjunct populations in northern Tanzania (Zigi River and Mlingano Dam). We also provide genetic evidence of O. korogwe × niloticus hybrids in three southern lakes and demonstrate heterogeneity in the extent of admixture across the genome. Finally, using the least admixed genomic regions we estimate that the northern and southern O. korogwe populations most plausibly diverged ~140,000 years ago, suggesting that the geographical separation of the northern and southern groups is not a result of a recent translocation, and instead these populations represent independent evolutionarily significant units. We conclude that these newly discovered and phenotypically unique cichlid populations are already threatened by hybridization with an invasive species, and propose that these irreplaceable genetic resources would benefit from conservation interventions.
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Affiliation(s)
| | - Antonia G P Ford
- Department of Life Sciences, Whitelands College, University of Roehampton, London, UK
| | - Adam G Ciezarek
- Earlham Institute, Norwich Research Park Innovation Centre, Norwich, UK
| | | | | | - Alan M Smith
- Department of Biological Sciences, University of Hull, Hull, UK
| | | | - Asilatu Shechonge
- Tanzania Fisheries Research Institute (TAFIRI), Dar es Salaam, Tanzania
| | - Rashid Tamatamah
- Tanzania Fisheries Research Institute (TAFIRI), Dar es Salaam, Tanzania
| | | | - Wilfried Haerty
- Earlham Institute, Norwich Research Park Innovation Centre, Norwich, UK
| | - Federica Di Palma
- Earlham Institute, Norwich Research Park Innovation Centre, Norwich, UK.,Department of Biological and Medical Sciences, University of East Anglia, Norwich, UK
| | - George F Turner
- School of Biological Sciences, Bangor University, Bangor, UK
| | - Martin J Genner
- School of Biological Sciences, University of Bristol, Bristol, UK
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Bradbeer SJ, Coughlan NE, Cuthbert RN, Crane K, Dick JTA, Caffrey JM, Lucy FE, Renals T, Davis E, Warren DA, Pile B, Quinn C, Dunn AM. The effectiveness of disinfectant and steam exposure treatments to prevent the spread of the highly invasive killer shrimp, Dikerogammarus villosus. Sci Rep 2020; 10:1919. [PMID: 32024949 PMCID: PMC7002758 DOI: 10.1038/s41598-020-58058-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 12/20/2019] [Indexed: 11/09/2022] Open
Abstract
Biosecurity protocols designed to prevent the spread of invasive alien species (IAS) are now an essential aspect of IAS management. However, the effectiveness of various biosecurity treatments requires further exploration. Killer shrimp, Dikerogammarus villosus, a notoriously high impact and ecosystem destabilising invader, has rapidly spread across Europe, and is of concern to invade Northern America. In this study, we examine the effectiveness of three commonly used, broad-spectrum disinfectants to cause mortality of D. villosus: Virasure Aquatic, Virkon Aquatic, and Virkon S. Immersion and spray treatments of 1%, 2% and 4% disinfectant solutions were examined for applications of up to 300 secs immersion and for up to ten consecutive sprays. Furthermore, we assessed the effectiveness of steam (≥100 °C) treatments for up to 120 secs. For all disinfectants, immersion in 1% solutions caused 100% mortality at ≥120 secs. At higher concentrations, shorter immersion times caused complete mortality: 60 and 15 secs for 2% and 4% solutions, respectively. Five sprays of 2% and 4% solutions resulted in 100% mortality, for all disinfectants. Direct steam exposure was highly effective, with complete D. villosus mortality occurring at ≥10 secs. Overall, brief exposure to broad-spectrum disinfectants and direct steam could be used to limit D. villosus spread.
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Affiliation(s)
- Stephanie J Bradbeer
- School of Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Neil E Coughlan
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, 19 Chlorine Gardens, Belfast, BT9 5DL, Northern Ireland, UK
- Queen's Marine Laboratory, Queen's University Belfast, 12-13 The Strand, Portaferry, BT22 1PF, Northern Ireland, UK
- Centre for Environmental Research, Innovation & Sustainability, Institute of Technology Sligo, Ash Lane, Co, Sligo, Ireland
| | - Ross N Cuthbert
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, 19 Chlorine Gardens, Belfast, BT9 5DL, Northern Ireland, UK
- Queen's Marine Laboratory, Queen's University Belfast, 12-13 The Strand, Portaferry, BT22 1PF, Northern Ireland, UK
| | - Kate Crane
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, 19 Chlorine Gardens, Belfast, BT9 5DL, Northern Ireland, UK
- Queen's Marine Laboratory, Queen's University Belfast, 12-13 The Strand, Portaferry, BT22 1PF, Northern Ireland, UK
| | - Jaimie T A Dick
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, 19 Chlorine Gardens, Belfast, BT9 5DL, Northern Ireland, UK
- Queen's Marine Laboratory, Queen's University Belfast, 12-13 The Strand, Portaferry, BT22 1PF, Northern Ireland, UK
| | - Joe M Caffrey
- INVAS Biosecurity Ltd., 82 Lakelands Close, Stillorgan, Co., Dublin, Ireland
| | - Frances E Lucy
- Centre for Environmental Research, Innovation & Sustainability, Institute of Technology Sligo, Ash Lane, Co, Sligo, Ireland
| | - Trevor Renals
- Environment Agency, Sir John Moore House, Victoria Square, Bodmin, Cornwall, PL31 1EB, UK
| | - Eithne Davis
- Centre for Environmental Research, Innovation & Sustainability, Institute of Technology Sligo, Ash Lane, Co, Sligo, Ireland
| | - Daniel A Warren
- School of Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
- Water@leeds, School of Geography, University of Leeds, Leeds, LS2 9JT, UK
| | - Benjamin Pile
- School of Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Claire Quinn
- School of Earth & Environment, University of Leeds, Leeds, LS2 9JT, UK
| | - Alison M Dunn
- School of Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK.
- Water@leeds, School of Geography, University of Leeds, Leeds, LS2 9JT, UK.
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Shechonge A, Ngatunga BP, Tamatamah R, Bradbeer SJ, Harrington J, Ford AGP, Turner GF, Genner MJ. Losing cichlid fish biodiversity: genetic and morphological homogenization of tilapia following colonization by introduced species. CONSERV GENET 2018; 19:1199-1209. [PMID: 30363773 PMCID: PMC6182432 DOI: 10.1007/s10592-018-1088-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Accepted: 07/09/2018] [Indexed: 11/04/2022]
Abstract
Among the many negative impacts of invasive species, hybridization with indigenous species has increasingly become recognized as a major issue. However, relatively few studies have characterized the phenotypic outcomes of hybridization following biological invasions. Here we investigate the genetic and morphological consequences of stocking invasive tilapia species in two water bodies in central Tanzania. We sampled individuals from the Mindu Reservoir on the Ruvu river system, and at Kidatu on the Great Ruaha-Rufiji river system. We screened individuals at 16 microsatellite loci, and quantified morphology using geometric morphometrics and linear measurements. In both the Mindu and Kidatu systems, we identified evidence of hybridization between indigenous Wami tilapia (Oreochromis urolepis) and the introduced Nile tilapia (Oreochromis niloticus) or blue-spotted tilapia (Oreochromis leucostictus). At both sites, purebred individuals could largely be separated using geometric morphometric variables, with hybrids occupying a broad morphospace among the parental species. Our data demonstrate that the gene pools and phenotypic identity of the indigenous O. urolepis have been severely impacted by the stocking of the invasive species. Given the lack of evidence for clear commercial benefits from stocking invasive tilapia species in waters already populated by indigenous congenerics, we suggest further spread of introduced species should be undertaken with considerable caution.
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Affiliation(s)
- Asilatu Shechonge
- Department of Aquatic Sciences and Fisheries, University of Dar es Salaam, P.O. Box 35064, Dar es Salaam, Tanzania
- Tanzania Fisheries Research Institute (TAFIRI), P.O. Box 9750, Dar es Salaam, Tanzania
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
| | - Benjamin P. Ngatunga
- Department of Aquatic Sciences and Fisheries, University of Dar es Salaam, P.O. Box 35064, Dar es Salaam, Tanzania
| | - Rashid Tamatamah
- Department of Aquatic Sciences and Fisheries, University of Dar es Salaam, P.O. Box 35064, Dar es Salaam, Tanzania
- Tanzania Fisheries Research Institute (TAFIRI), P.O. Box 9750, Dar es Salaam, Tanzania
| | - Stephanie J. Bradbeer
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
| | - Jack Harrington
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
| | - Antonia G. P. Ford
- Department of Life Sciences, Whitelands College, University of Roehampton, Holybourne Avenue, London, SW15 4JD UK
| | - George F. Turner
- School of Biological Sciences, Bangor University, Bangor, Gwynedd LL57 2UW UK
| | - Martin J. Genner
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
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Bradbeer SJ, Harrington J, Watson H, Warraich A, Shechonge A, Smith A, Tamatamah R, Ngatunga BP, Turner GF, Genner MJ. Limited hybridization between introduced and Critically Endangered indigenous tilapia fishes in northern Tanzania. Hydrobiologia 2018; 832:257-268. [PMID: 30880834 PMCID: PMC6394572 DOI: 10.1007/s10750-018-3572-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 02/26/2018] [Accepted: 02/27/2018] [Indexed: 06/09/2023]
Abstract
Hybridization between introduced and indigenous species can lead to loss of unique genetic resources and precipitate extinction. In Tanzania, the Nile tilapia (Oreochromis niloticus) and blue-spotted tilapia (Oreochromis leucostictus) have been widely introduced to non-native habitats for aquaculture and development of capture fisheries. Here, we aimed to quantify interspecific hybridization between these introduced species and the indigenous species Oreochromis esculentus, Oreochromis jipe and Oreochromis korogwe. In the Pangani basin, several hybrids were observed (O. niloticus × O. jipe, O. leucostictus × O. jipe, O. niloticus × O. korogwe), although hybrids were relatively uncommon within samples relative to purebreds. Hybrids between the native O. jipe × O. korogwe were also observed. In the Lake Victoria basin, no evidence of hybrids was found. Analysis of body shape using geometric morphometrics suggested that although purebreds could be discriminated from one another, hybrids could not be readily identified on body and head shape alone. These results provide the first evidence of hybridization between the introduced species and the Critically Endangered O. jipe in Tanzania. Given uncertainty regarding benefits of introduced species over large-bodied indigenous species in aquaculture and capture fisheries, we suggest that future introductions of hybridization-prone species should be carefully evaluated.
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Affiliation(s)
- Stephanie J. Bradbeer
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
- School of Biology, University of Leeds, Miall Building, Leeds, LS2 9JT UK
| | - Jack Harrington
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
| | - Henry Watson
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
| | - Abrahim Warraich
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
| | - Asilatu Shechonge
- Tanzania Fisheries Research Institute (TAFIRI), P.O. Box 9750, Dar es Salaam, Tanzania
- Department of Aquatic Sciences and Fisheries, University of Dar es Salaam, P.O. Box 35064, Dar es Salaam, Tanzania
| | - Alan Smith
- Evolutionary and Environmental Genomics Group, School of Environmental Sciences, University of Hull, Hull, HU5 7RX UK
| | - Rashid Tamatamah
- Tanzania Fisheries Research Institute (TAFIRI), P.O. Box 9750, Dar es Salaam, Tanzania
- Department of Aquatic Sciences and Fisheries, University of Dar es Salaam, P.O. Box 35064, Dar es Salaam, Tanzania
| | - Benjamin P. Ngatunga
- Tanzania Fisheries Research Institute (TAFIRI), P.O. Box 9750, Dar es Salaam, Tanzania
| | - George F. Turner
- School of Biological Sciences, Bangor University, Bangor, Gwynedd, LL57 2UW UK
| | - Martin J. Genner
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
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Shechonge A, Ngatunga BP, Bradbeer SJ, Day JJ, Freer JJ, Ford AGP, Kihedu J, Richmond T, Mzighani S, Smith AM, Sweke EA, Tamatamah R, Tyers AM, Turner GF, Genner MJ. Widespread colonisation of Tanzanian catchments by introduced Oreochromis tilapia fishes: the legacy from decades of deliberate introduction. Hydrobiologia 2018; 832:235-253. [PMID: 30880833 PMCID: PMC6394791 DOI: 10.1007/s10750-018-3597-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 03/09/2018] [Accepted: 03/16/2018] [Indexed: 06/09/2023]
Abstract
From the 1950s onwards, programmes to promote aquaculture and improve capture fisheries in East Africa have relied heavily on the promise held by introduced species. In Tanzania these introductions have been poorly documented. Here we report the findings of surveys of inland water bodies across Tanzania between 2011 and 2017 that clarify distributions of tilapiine cichlids of the genus Oreochromis. We identified Oreochromis from 123 sampling locations, including 14 taxa restricted to their native range and three species that have established populations beyond their native range. Of these three species, the only exotic species found was blue-spotted tilapia (Oreochromis leucostictus), while Nile tilapia (Oreochromis niloticus) and Singida tilapia (Oreochromis esculentus), which are both naturally found within the country of Tanzania, have been translocated beyond their native range. Using our records, we developed models of suitable habitat for the introduced species based on recent (1960-1990) and projected (2050, 2070) East African climate. These models indicated that presence of suitable habitat for these introduced species will persist and potentially expand across the region. The clarification of distributions provided here can help inform the monitoring and management of biodiversity, and inform policy related to the future role of introduced species in fisheries and aquaculture.
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Affiliation(s)
- Asilatu Shechonge
- Department of Aquatic Sciences and Fisheries, University of Dar es Salaam, P.O. Box 35064, Dar es Salaam, Tanzania
- Tanzania Fisheries Research Institute (TAFIRI), P.O. Box 9750, Dar es Salaam, Tanzania
| | - Benjamin P. Ngatunga
- Department of Aquatic Sciences and Fisheries, University of Dar es Salaam, P.O. Box 35064, Dar es Salaam, Tanzania
| | - Stephanie J. Bradbeer
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
| | - Julia J. Day
- Department of Genetics, Evolution and Environment, University College London, Darwin Building, Gower Street, London, WC1E 6BT UK
| | - Jennifer J. Freer
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
| | - Antonia G. P. Ford
- School of Biological Sciences, Bangor University, Bangor, Gwynedd LL57 2UW UK
- Department of Life Sciences, Centre for Research in Ecology, Whitelands College, University of Roehampton, Holybourne Avenue, London, SW15 4JD UK
| | - Jonathan Kihedu
- Tanzania Fisheries Research Institute (TAFIRI), P.O. Box 9750, Dar es Salaam, Tanzania
| | - Tabitha Richmond
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
| | - Semvua Mzighani
- Tanzania Fisheries Research Institute (TAFIRI), P.O. Box 9750, Dar es Salaam, Tanzania
| | - Alan M. Smith
- Evolutionary and Environmental Genomics Group, School of Environmental Sciences, University of Hull, Hull, HU5 7RX UK
| | - Emmanuel A. Sweke
- Tanzania Fisheries Research Institute (TAFIRI), P.O. Box 9750, Dar es Salaam, Tanzania
| | - Rashid Tamatamah
- Department of Aquatic Sciences and Fisheries, University of Dar es Salaam, P.O. Box 35064, Dar es Salaam, Tanzania
- Tanzania Fisheries Research Institute (TAFIRI), P.O. Box 9750, Dar es Salaam, Tanzania
| | - Alexandra M. Tyers
- School of Biological Sciences, Bangor University, Bangor, Gwynedd LL57 2UW UK
| | - George F. Turner
- School of Biological Sciences, Bangor University, Bangor, Gwynedd LL57 2UW UK
| | - Martin J. Genner
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
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