Browsing by Author "Coscia, Ilaria"
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- High-density SNP panel provides little evidence for population structure in European sea bass (Dicentrarchus labrax) in waters surrounding the UKPublication . Taylor, Martin I.; Lamb, Philip D.; Coscia, Ilaria; Murray, David S.; Brown, Mary; Cameron, Tom C.; Davison, Phil I.; Freeman, Howard A.; Georgiou, Katerina; Grati, Fabio; Haugen, Thrond; Karachle, Paraskevi K.; Kennedy, Richard; Lanssens, Thomas; Lincoln, Harriet; Martinho, Filipe; McCarthy, Ian; Petroutsos, Spyros-Iasonas; Pita, Pablo; Pontes, João; Baucells, Marta P.; Rangel, Mafalda; Roche, William; Sbragaglia, Valerio; Sturrock, Anna M; Taylor, Michelle L; Wogerbauer, Ciara; Veiga, Pedro; Verver, Sieto; Weltersbach, Marc Simon; Hyder, Kieran; Stewart W GrantThe European sea bass (Dicentrarchus labrax) is a commercially and recreationally important fish widely, distributed across the Northeast Atlantic Ocean and Mediterranean Sea. Two distinct lineages that represent the Atlantic and Mediterranean regions have been previously identified, with a hybrid zone close to the Almeria-Oran front. The presence of fine-scale population structure within the Northeast Atlantic region is less clear. Here, we investigated population structure in adult samples obtained from the northern part of the Atlantic range surrounding the UK, Ireland, Belgium, Germany, France, the Netherlands, and Norway, along with outgroups from Portugal and the Mediterranean, using a panel of 41 K single nucleotide polymorphism markers. Population structure among Northeast Atlantic Ocean samples was weak in both spawning-(FST = 0.00022) and feeding-(FST = 0.00032) season data sets, with small pairwise FST values between sample pairs. However, average FST was larger between spawning samples than between feeding samples, with a pattern of isolation-by-distance among the spawning samples, but not the feeding samples, suggesting some biologically meaningful population structure. The largest pairwise FST values at both International Council for the Exploration of the Sea (ICES) rectangle and division scales involved a sample from the west of Ireland. We found no evidence of a gradient in "Mediterranean" ancestry among samples collected around the UK in our data set or in a reanalysis of a published data set where such a pattern had been previously identified. In summary, there was no evidence that sea bass in different ICES divisions within the Northeast Atlantic Ocean represents genetically separate populations. Further work is required to reconcile evidence from tagging and modelling studies that suggest the potential for demographic independence with the genetic data.
- Life in a drop: sampling environmental DNA for marine fishery management and ecosystem monitoringPublication . Gilbey, John; Carvalho, Gary; Castilho, Rita; Coscia, Ilaria; Coulson, Mark W.; Dahle, Geir; Derycke, Sofie; Francisco, Sara M.; Helyar, Sarah J.; Johansen, Torild; Junge, Claudia; Layton, Kara K. S.; Martinsohn, Jann; Matejusova, Iveta; Robalo, Joana I.; Rodriguez-Ezpeleta, Naiara; Silva, Goncalo; Strammer, Ilona; Vasemagi, Anti; Volckaert, Filip A. M.Science-based management of marine fisheries and effective ecosystem monitoring both require the analysis of large amounts of often complex and difficult to collect information. Legislation also increasingly requires the attainment of good environmental status, which again demands collection of data to enable efficient monitoring and management of biodiversity. Such data is traditionally obtained as a result of research surveys through the capture and/or visual identification of organisms. Recent years have seen significant advances in the utilisation of environmental DNA (eDNA) in the marine environment in order to develop alternative cost-effective ways to gather relevant data. Such approaches attempt to identify and/or quantify the species present at a location through the detection of extra-organismal DNA in the environment. These new eDNA based approaches have the potential to revolutionise data collection in the marine environment using non-invasive sampling methods and providing snapshots of biodiversity beyond the capacity of traditional sampling. Here we present a non-technical summary of different approaches in the field of eDNA, and emphasise the broad application of this approach, with value for the governance and management of marine aquatic ecosystems. The review focuses on identifying those tools which are now readily applicable and those which show promise but are currently in development and require further validations. The aim is to provide an understanding of techniques and concepts that can be used by managers without genetic or genomic expertise when consulting with specialists to perform joint evaluations of the utility of the approaches.