Molecular Data Confirm the Occurrence of the Allochthonous <i>Gambusia holbrooki</i> (Pisces: Poeciliidae) in Sicily and the Maltese Archipelago
A major threat to biodiversity is represented by Invasive Alien Species (IAS), particularly on freshwater ecosystems, which are already heavily altered by human activities. Two of the most pernicious IAS are the eastern and western mosquitofish, i.e., <i>Gambusia holbrooki</i> and <i&...
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| author | Luca Vecchioni Mirko Liuzzo Arnold Sciberras Jeffrey Sciberras Justin Formosa Alan Deidun Gabriele Giacalone Vincenzo Arizza Marco Arculeo Federico Marrone Francesco Paolo Faraone |
| author_facet | Luca Vecchioni Mirko Liuzzo Arnold Sciberras Jeffrey Sciberras Justin Formosa Alan Deidun Gabriele Giacalone Vincenzo Arizza Marco Arculeo Federico Marrone Francesco Paolo Faraone |
| author_sort | Luca Vecchioni |
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| description | A major threat to biodiversity is represented by Invasive Alien Species (IAS), particularly on freshwater ecosystems, which are already heavily altered by human activities. Two of the most pernicious IAS are the eastern and western mosquitofish, i.e., <i>Gambusia holbrooki</i> and <i>G</i>. <i>affinis</i>. These two poeciliids are morphologically very close to each other, and soon after their formal description, <i>G</i>. <i>holbrooki</i> was considered a subspecies of <i>G</i>. <i>affinis</i>. In the following years, several studies proved that these two entities belonged to two different species; nevertheless, it was only at the end of the 1990s that their separate taxonomic status was re-established. In the 1920s and 1930s, both <i>G. holbrooki</i> and <i>G</i>. <i>affinis</i> were asynchronously introduced from the United States into Europe and subsequently translocated globally as biocontrol agents of the malaria vector (i.e., the larvae of the <i>Anopheles</i> mosquitoes), with dramatic consequences for the inland water native fauna. However, due to taxonomic uncertainties and nomenclatural instability, for years, there were doubts about which <i>Gambusia</i> species had been introduced in different regions. The first available molecular studies confirmed the occurrence of <i>G</i>. <i>holbrooki</i> in Europe, but no evidence confirming the occurrence of <i>G</i>. <i>affinis</i> was found. Despite this, some records report the occurrence of western mosquitofish in Italy and Malta. Considering the negative effects that the mosquitofish has on the native biota, it is of paramount importance to know the precise biological diversity of the native and non-native species to better implement environmental management strategies to properly preserve the already-fragile waterbodies. Therefore, to check for the possible occurrence of <i>G</i>. <i>affinis</i> in Italy and Malta, we conducted extensive sampling in Sicily (Italy) and in the Maltese archipelago, aiming to verify the identity of <i>Gambusia</i> populations occurring in the study area. Based on sequences of the mitochondrial cytochrome b gene, we consistently observed the occurrence of only <i>G. holbrooki</i> in the investigated area, finding, almost exclusively, the most common haplotype known for the species in the whole invaded range (i.e., “HOL1”). |
| format | Article |
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| spelling | doaj-art-f548d85092e343f786897fd1b939ecfe2025-01-24T13:29:29ZengMDPI AGDiversity1424-28182025-01-011714810.3390/d17010048Molecular Data Confirm the Occurrence of the Allochthonous <i>Gambusia holbrooki</i> (Pisces: Poeciliidae) in Sicily and the Maltese ArchipelagoLuca Vecchioni0Mirko Liuzzo1Arnold Sciberras2Jeffrey Sciberras3Justin Formosa4Alan Deidun5Gabriele Giacalone6Vincenzo Arizza7Marco Arculeo8Federico Marrone9Francesco Paolo Faraone10Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Via Archirafi 18, 90123 Palermo, ItalyDepartment of Environmental Sciences, Informatics and Statistics (DAIS), Ca’ Foscari University of Venice, 30170 Venice, ItalyThe Exterminator, Service Hub, Triq San Gorg, 5 In-Naxxar, NXR 2541 Naxxar, MaltaThe Exterminator, Service Hub, Triq San Gorg, 5 In-Naxxar, NXR 2541 Naxxar, MaltaThe Exterminator, Service Hub, Triq San Gorg, 5 In-Naxxar, NXR 2541 Naxxar, MaltaOceanography Malta Research Group, Department of Geosciences, Faculty of Science, University of Malta, MSD 2080 Msida, MaltaDepartment of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Via Archirafi 18, 90123 Palermo, ItalyDepartment of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Via Archirafi 18, 90123 Palermo, ItalyDepartment of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Via Archirafi 18, 90123 Palermo, ItalyDepartment of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Via Archirafi 18, 90123 Palermo, ItalyDepartment of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Via Archirafi 18, 90123 Palermo, ItalyA major threat to biodiversity is represented by Invasive Alien Species (IAS), particularly on freshwater ecosystems, which are already heavily altered by human activities. Two of the most pernicious IAS are the eastern and western mosquitofish, i.e., <i>Gambusia holbrooki</i> and <i>G</i>. <i>affinis</i>. These two poeciliids are morphologically very close to each other, and soon after their formal description, <i>G</i>. <i>holbrooki</i> was considered a subspecies of <i>G</i>. <i>affinis</i>. In the following years, several studies proved that these two entities belonged to two different species; nevertheless, it was only at the end of the 1990s that their separate taxonomic status was re-established. In the 1920s and 1930s, both <i>G. holbrooki</i> and <i>G</i>. <i>affinis</i> were asynchronously introduced from the United States into Europe and subsequently translocated globally as biocontrol agents of the malaria vector (i.e., the larvae of the <i>Anopheles</i> mosquitoes), with dramatic consequences for the inland water native fauna. However, due to taxonomic uncertainties and nomenclatural instability, for years, there were doubts about which <i>Gambusia</i> species had been introduced in different regions. The first available molecular studies confirmed the occurrence of <i>G</i>. <i>holbrooki</i> in Europe, but no evidence confirming the occurrence of <i>G</i>. <i>affinis</i> was found. Despite this, some records report the occurrence of western mosquitofish in Italy and Malta. Considering the negative effects that the mosquitofish has on the native biota, it is of paramount importance to know the precise biological diversity of the native and non-native species to better implement environmental management strategies to properly preserve the already-fragile waterbodies. Therefore, to check for the possible occurrence of <i>G</i>. <i>affinis</i> in Italy and Malta, we conducted extensive sampling in Sicily (Italy) and in the Maltese archipelago, aiming to verify the identity of <i>Gambusia</i> populations occurring in the study area. Based on sequences of the mitochondrial cytochrome b gene, we consistently observed the occurrence of only <i>G. holbrooki</i> in the investigated area, finding, almost exclusively, the most common haplotype known for the species in the whole invaded range (i.e., “HOL1”).https://www.mdpi.com/1424-2818/17/1/48cyprinodontiformescytochrome b geneinland waterinvasive alien speciesmediterranean areamtDNA |
| spellingShingle | Luca Vecchioni Mirko Liuzzo Arnold Sciberras Jeffrey Sciberras Justin Formosa Alan Deidun Gabriele Giacalone Vincenzo Arizza Marco Arculeo Federico Marrone Francesco Paolo Faraone Molecular Data Confirm the Occurrence of the Allochthonous <i>Gambusia holbrooki</i> (Pisces: Poeciliidae) in Sicily and the Maltese Archipelago Diversity cyprinodontiformes cytochrome b gene inland water invasive alien species mediterranean area mtDNA |
| title | Molecular Data Confirm the Occurrence of the Allochthonous <i>Gambusia holbrooki</i> (Pisces: Poeciliidae) in Sicily and the Maltese Archipelago |
| title_full | Molecular Data Confirm the Occurrence of the Allochthonous <i>Gambusia holbrooki</i> (Pisces: Poeciliidae) in Sicily and the Maltese Archipelago |
| title_fullStr | Molecular Data Confirm the Occurrence of the Allochthonous <i>Gambusia holbrooki</i> (Pisces: Poeciliidae) in Sicily and the Maltese Archipelago |
| title_full_unstemmed | Molecular Data Confirm the Occurrence of the Allochthonous <i>Gambusia holbrooki</i> (Pisces: Poeciliidae) in Sicily and the Maltese Archipelago |
| title_short | Molecular Data Confirm the Occurrence of the Allochthonous <i>Gambusia holbrooki</i> (Pisces: Poeciliidae) in Sicily and the Maltese Archipelago |
| title_sort | molecular data confirm the occurrence of the allochthonous i gambusia holbrooki i pisces poeciliidae in sicily and the maltese archipelago |
| topic | cyprinodontiformes cytochrome b gene inland water invasive alien species mediterranean area mtDNA |
| url | https://www.mdpi.com/1424-2818/17/1/48 |
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