Over historical time, Berre Lagoon (SE France, NW Mediterranean Sea) had undergone various changes. These became more significant, transforming and even disruptive since the 19th century when the channel connecting the lagoon to the sea was deepened and the surrounding areas were industrialized and urbanized. Pollution and anoxic crises were major consequences. Concomitantly, many non-indigenous species (NIS) arrived in the lagoon. In recent years, climate change and freshwater input from a hydro-electric power plant have been the main drivers influencing the lagoon ecosystem. The major anoxic crisis of 2018 caused the lagoon ecosystem to collapse. In the following years, an increase in mean salinity linked with low precipitation in the regional watershed and the resulting lower freshwater input from the hydro-electric power plant caused rapid changes in ecological assemblages and favoured newly arrived NIS. An updated list of NIS and cryptogenic species (38 taxa according to the last census) is presented here. The species introduction rate has strongly increased since 2000, or at least the recognition rate. Temporal and spatial changes are discussed for major NIS in Berre Lagoon. The success of new NIS is interpreted as a consequence of the 2018 crisis, of global change and of re-marinization of the water body related to dryer periods and stricter freshwater input regulation.

Climate change is predicted to increase the prevalence of marine heatwaves with an increase in heatwave frequency and intensity. While some studies have shown the effect of marine heatwaves in warm temperate climates and the effect of overall higher temperature in warm and cold temperate climates, it is yet not entirely understood how heatwaves impact marine urban communities in cold temperate climates. As thermal resistance might be related to selective pressures and acclimation, it seems reasonable to assume that they may have a strong impact on local fauna and flora. In the present study, we simulated an in situ high amplitude heatwave and observed the community structure and the metabolism of Bugula neritina at two time-steps after the heatwave and compared them to control communities and individuals. Contrary to our expectations, the community structure remained vastly unaffected, as did the total metabolome of B. neritina. This shows that the community was able to resist the disturbance of the heatwave. Bugula neritina additionally showed a certain metabolic resilience as the already minor differences in the metabolome between control and the heatwave treatment diminished even further between the tested time steps.

Dispersal is essential for all organisms to colonize new areas. Like many other aquatic invertebrates, Anostraca (Crustacea) disperse passively as dormant fertilized eggs. Here, we first study the genetic diversity of Branchinecta fairy shrimps (identified morphologically as B. readingi) inhabiting lakes in Saskatchewan and British Columbia, Canada. Second, we attempt to reconstruct the phylogeny and dispersal events that explain their genetic distribution. Finally, we compare genetic diversity and distribution of Branchinecta sp. and Artemia franciscana, the 2 anostracans inhabiting the Saskatchewan lakes but with different salinity niches. To this aim, we sequenced CO1 and 16S gene fragments of the Branchinecta individuals collected from 8 Saskatchewan lakes. We found a relatively high number of haplotypes for both markers (79 in CO1 and 76 in 16S) in Branchinecta from Saskatchewan. Three genetic clades at the CO1 gene region were found in Saskatchewan Branchinecta, one of which was widely recorded previously in the United States (but described as B. mackini). By contrast, 54 CO1 haplotypes were previously recorded in A. franciscana in Saskatchewan, with all CO1 sequences belonging to one genetic clade, suggesting that Branchinecta sequences might originate from several distinct Ice Age refugia, contrary to A. franciscana, which might originate from a single refuge. High density of suitable habitats (>100 000 lakes in Saskatchewan), weak priority effects, and frequent dispersal events could explain high genetic diversity found in the studied Branchinecta. However, we found no genetic support for a distinction between B. readingi and B. mackini.

Most species arriving from a donor to a recipient area do not succeed in establishing long-lasting self-sustaining populations. However, successful introductions are far better documented than those that failed, especially those occurring before or near the advent of the Linnaean binomial nomenclature. We report here an introduction from the mid-18th century (possibly in 1750 or 1751) of an exotic mussel transported as fouling on ship hulls from the western coast of Morocco (Atlantic Ocean) to the port of Marseilles (Mediterranean Sea). The exotic mussel, which survived several years, has been identified as probably being the brown mussel, Perna perna, a species with warm-water affinities, which much later became invasive in several areas of the world ocean. The documents of the 18th and early 19th century, which mentioned the event, held ‘the curious’ and ‘amateurs’, who harvested the mussels, responsible for its extirpation. More realistically, it is hypothesised that the mussel population did not survive the return of severe cold weather conditions, after a few relatively mild decades, in the context of the Little Ice Age (LIA). These conclusions were deduced from historical data and are therefore open to discussion.

When marine natural sciences began to be the concern of most European scientists, in the middle of the 19th century, Marseille, in southern France, was no exception. The creation, ca. 150 years ago, of the first Zoology Laboratory of the Faculty of Sciences of Marseille took place in 1868. Under the leadership of Antoine-Fortuné Marion, it soon led to the creation of the Station Marine d’Endoume (SME) in 1889. Marion’s pioneering work survived both world wars and was then taken to another dimension by Jean-Marie Pérès, head of the marine station from 1948 to 1983. This institution is still alive to date. We here inventoried all the taxa described by SME scientists (1870 to 2021) and arranged them in a public database. Three main periods of activity at the SME are described, as well as the focus made through time to different groups of taxa, selected ecosystems, or biogeographic areas. Through many examples, it was possible to document how these naturalistic, taxonomic descriptions contributed to a broader scientific knowledge within this period. Finally, we discussed trends in taxonomic and naturalistic research, based on the SME experience.

Three decades ago, worldwide biodiversity hotspots were founded on the distributions of continental plants and vertebrates. Here, we question the timeliness of refining the geography of hotspots by basing their definition on more taxa, thanks to the molecular data available for hyper-diverse organisms such as insects, fungi and marine biota.To do so, we assess the temporal dynamic of molecular data acquisition and the geography of knowledge about lineages currently included or not into hotspot definition. Using the Mediterranean Basin hotspot as a case study, we examine the taxonomic and geographical facets of 175,828 DNA sequences distributed over 21,552 species, and 13,001 indexed biodiversity publications. We reveal a deeply fractured repartition of biodiversity research efforts within the hotspot regarding both barcoding efforts and publication activity, the northern side of the Mediterranean concentrating 84.16 % of the publications and 75.99 % of the public DNA sequences. In addition, 57.55 % of the sequences belong to lineages which were excluded from hotspots definition, with highly congruent geographical patterns among marine and continental lineages.Based on this analysis, we suggest 1) using the uneven geography of knowledge to rebalance sampling efforts towards poorly known regions within the Mediterranean hotspot, 2) handling the molecular corpus of orphan lineages to feed forthcoming multi-taxa biodiversity assessment initiatives, in order to 3) refine the geography of

Urbanization of coastal habitats, often exemplified by harbors and marinas, has led to various ecological para-digms, questioning the functioning of these new ecosystems. In the present study we investigated, in a large Mediterranean harbor, whether spatial variation of pollution is present and if this variability drives the structure of the sessile community. We hypothesized locations to have significantly different communities, based on the assumption on the occurrence of environmental gradients of pollution that would constitute selective filters. Three distinct community types were identified in June, coinciding with spatially variable contaminants in sediments. We observed then an unexpected shift of the community between June and August associated to a sharp decrease in biodiversity and a decline of most species, masking the effects of local variation and thus leading to the homogenization of the biodiversity within the harbor. This shift coincided with successive heat -waves (the longest lasting 13 days over 25 degrees C, with a thermal peak at 28 degrees C) which might potentially be asso-ciated with a die-off in the harbor communities, regardless of location.

Urbanization of coastal habitats, of which harbors and marinas are the paragon, has led to various ecological paradigms about their functioning. Harbor infrastructures offer new hard substrata that are colonized by a wide variety of organisms (biofouling) including many introduced species. These structures also modify hydrodynamism and contaminant dispersal, leading to strong disturbance gradients within them. Differences in sessile community structure have previously been correlated to these gradients at small spatial scale (<100 m). Local adaptation might be involved to explain such results, but as correlation is not causation, the present study aims to understand the causal link between the environmental gradients and community structure through a reciprocal transplant experiment among three sites of a marina (inner, middle, entrance). Our results highlighted strong small-scale spatial variations of contaminants (trace metals, PCB, pesticides, and PAH) in sediments and animal samples which have been causally linked to changes in community composition after transplant. But historical contingency and colonization succession also play an important role. Our results provided strong evidence for local adaptation since community structure, respiration, and pollutant uptake in Bugula neritina, as well as the metabolomes of B. neritina and Ciona intestinalis were impacted by the transplant with a disadvantage for individuals transplanted from the entrance to the inner location. The here observed results may thus indicate that the disturbance gradient in marinas might constitute a staple for selecting pollutant-resistant species and populations, causing local adaptation. This highlights the importance of conducting further studies into small scale local adaptation.

Climate change constitutes a major challenge for marine urban ecosystems and ocean warming will likely strongly affect local communities. Non-Indigenous Species (NIS) have been shown to often have higher heat resistance than natives, but studies investigating how forthcoming global warming might affect them in marine urban environments remain scarce, especially in Situ studies. Here we used an in Situ warming experiment in a NW Mediterranean (warm temperate) and a NE Atlantic (cold temperate) marina to see how global warming might affect recruited communities in the near future. In both marinas, warming resulted in significantly different community structure, lower biomass, and more empty space compared to control. However, while in the warm temperate marina, NIS showed an increased surface cover, it was reduced in the cold temperate one. Metabolomic analyses on Bugula neritina in the Atlantic marina revealed potential heat stress experienced by this introduced bryozoan and a potential link between heat stress and the expression of a halogenated alkaloid, Caelestine A. The present results might indicate that the effects of global warming on the prevalence of NIS may differ between geographical provinces, which could be investigated by larger scale studies.

Drivers of successful introduction of exotic species remain a major headline in marine invasion biology. We ran two experiments aiming to disentangle the effects of abiotic factors like contaminants and the effect of predation on recruits' survival of one native and one alien ascidian species. A feeding experiment allowed us to monitor microscale variation of generalist fish predation, which varied significantly within a marina. We also monitored the in situ survival of lab-grown ascidians at three locations within the marina, half with predator cage exclusion. The survival of the native Ciona intestinalis was conjointly highly influenced by location and caging. We were able to identify a link between predation intensity exerted by mobile generalist macropredators and C. intestinalis survival, whereas none of the measured contaminants accounted for site variability of survival. The non-indigenous Styela clava had significant higher survival and biomass when uncaged, suggesting a positive effect of predation for this species. The natural in situ recruits of C. intestinalis showed higher biomass when caged and may have competed with lab-grown S. clava. Our results suggest that generalist fish predation may play a crucial role in the success of non-indigenous species due to facilitation through competitive release.

As a result of urbanization, coastal environments are being disturbed by various anthropogenic pressures. These are concentrated in harbor areas where the addition of artificial structures and the presence of pollutants seems to favor the settlement of non-indigenous species. Most studies on these organisms are often carried out in a single time window without integrating temporal variability. Here, we analyzed multi-year photographic data of marina communities taken from 3 experiments conducted between 2016 and 2019 in the same marina. These photographs were of recruitment plates placed at the inner, middle and entrance locations of the marina, permitting us to discern the community differences and the distribution of non-indigenous taxa between these 3 locations. Over the entire study period, the communities that grew at the entrance and the inner locations of the marina were always different. Non-indigenous taxa also appeared to be more prevalent in the inner location of the marina. Our results suggest that the presence of different environmental filters between the entrance and the inner location could explain these observations. We suggest this could be due to a pollution gradient, with high pollution at the inner location of the marina, and to competitive pressure exerted by the tunicate Ciona intestinalis at the marina entrance.

The American brine shrimp Artemia franciscana is important in aquaculture and has become invasive in other continents, aided by dispersal via waterbirds. However, little is known about processes underlying its genetic diversity and population structure in its natural habitat in North America. These processes, including dispersal and local adaptation, are pivotal drivers of species distribution and community structure, and therefore central to aquatic biodiversity. We studied 15 populations in natural saline lakes of Saskatchewan, Canada to determine the influence of variation in geological history, water chemistry, lake size, and location. We aimed to determine the relative importance of isolation by distance and isolation by environment using the cytochrome c oxidase subunit 1 gene (CO1) as a mitochondrial marker and five nuclear microsatellite markers. Geographic patterns for CO1 and microsatellites differed, with lakes clustering in different groups based on genetic distances according to the marker used. CO1 better indicated historical colonisation processes, suggesting potential routes of initial colonisation when lakes were formed after deglaciation 11,000–15,000 years ago. Differentiation between lakes based on nuclear markers was strongly related to variation in hydrochemistry, suggested by distance-based redundancy analysis, but there was no indication of isolation by distance. The ratio between alkalinity and the sum of Ca and Mg concentrations was particularly important, although a lake with a high Cl concentration caused by potash mining also had a unique Artemia population. Geochemistry is important in the adaptive radiation of anostracan crustaceans. Our study suggests that it also underlies intraspecific genetic variation between populations, promoting isolation by environment, and making dispersal ineffective when cysts are moved by birds between lakes with different hydrochemistry. ​

Understanding how introduced species succeed and become widely distributed within non-native areas is critical to reduce the threats posed by them. Our goal was to reconstruct the main invasion routes and invasion dynamics of a global freshwater invader, the red swamp crayfish, Procambarus clarkii, through the analysis of its genetic variability in both native and invasive ranges. We inferred invasion routes and population structure from the analysis of a fragment (608 base pairs) of the mitochondrial marker cytochrome c oxidase subunit I from 1,062 individuals of P. clarkii in addition to 354 GenBank sequences, for a total of 122 populations (22 natives and 100 invaded). Genetic structure was assessed using analysis of molecular variance and non-metric multidimensional scaling analyses. We analysed haplotype frequencies for the genetic variability in each locality and region. The haplotype network was depicted by using PopART software. A high haplotype diversity was found in the native range (haplotype diversity [Hd]: 0.90), but also in some non-native areas, such as western U.S.A. (Hd: 0.80), areas of Mexico (Hd: 0.78), and some hotspots in Europe (e.g. southern Spain or Italy), suggesting a complex pattern of multiple introductions. We grouped all localities in five differentiated groups according to biogeographic origin: the native area, west Americas, east U.S.A., Asia, and Europe. Additionally, the identification of 15 haplotypes shared between at least two localities, the phylogenetic network estimation and indices of genetic differentiation among localities allowed us to identify a large genetic admixture in the native range; the two independent invasion routes (i.e. westwards and eastwards) in U.S.A. from the native range (Louisiana and Texas) with translocations within each area; a stepping-stone introduction from U.S.A. to Japan (involving few individuals) themselves introduced to China afterwards; the entry of P. clarkii from Louisiana (U.S.A.) into southern Spain and their multiple secondary introductions over Europe as well as other possible introductions in central Europe. Our study emphasises the need for unravelling the global invasion routes and the demographic processes underlying the introduction of exotic species (i.e. admixture, bridgehead invasion effect, and propagule pressure) to control the spread of invasive species. Our findings highlight the value of genetic analyses to identify the geographic origin of source populations as well as the variability of invaded areas in order to reconstruct invasion dynamics and facilitate management of invasive species (e.g. through environmental DNA monitoring).

Predicting responses of plankton to variations in essential nutrients is hampered by limited in situ measurements, a poor understanding of community composition, and the lack of reference gene catalogs for key taxa. Iron is a key driver of plankton dynamics and, therefore, of global biogeochemical cycles and climate. To assess the impact of iron availability on plankton communities, we explored the comprehensive bio‐oceanographic and bio‐omics data sets from Tara Oceans in the context of the iron products from two state‐of‐the‐art global scale biogeochemical models. We obtained novel information about adaptation and acclimation toward iron in a range of phytoplankton, including picocyanobacteria and diatoms, and identified whole subcommunities covarying with iron. Many of the observed global patterns were recapitulated in the Marquesas archipelago, where frequent plankton blooms are believed to be caused by natural iron fertilization, although they are not captured in large‐scale biogeochemical models. This work provides a proof of concept that integrative analyses, spanning from genes to ecosystems and viruses to zooplankton, can disentangle the complexity of plankton communities and can lead to more accurate formulations of resource bioavailability in biogeochemical models, thus improving our understanding of plankton resilience in a changing environment.

Event Abstract Back to Event The PERCEBES project: science for the spatial management of the stalked barnacle fishery in the Atlantic Arc Katja Geiger1*, José Luis Acuña2, Alba Aguión3, Arrontes Julio2, Marion Ballenghiem4, Yaisel J. Borrell5, Caroline Broudin4, João Castro6, Juliette Chiss4, Teresa Cruz7, Dominique Davoult4, Jesus Dubert8, Pierre-Antoine Dumont9, Feis Marieke4, Joana N. Fernandes10, Consolación Fernández1, Lucía García11, Eva Garcia-Vazquez5, Céline Houbin4, David Jacinto10, Didier Jollivet4, Christophe Lejeusne4, Gonzalo Macho12, David Mateus10, Paloma Morán13, Carlota Muñiz12, Amandine Nicolle9, Rita Nolasco8, Elena Ojea12, Marina Parrondo5, Lucille Perrier4, Henrique Queiroga14, José Manuel Rico1, Antonella Rivera15, María Del Pino Rueda11, Teresa Silva10, Jorge Sostres1, Eric Thiebaut4 and Elsa Vazquez12 1 Department of Organisms and Systems Biology, University of Oviedo, Spain 2 Department of Organisms and Systems Biology, University of Oviedo, Spain 3 Department of Ecology and Animal Biology, University of Vigo, Spain 4 Station Biologique de Roscoff, France 5 Department of Functional Biology, University of Oviedo, Spain 6 Center for Marine and Environmental Sciences (MARE), Portugal 7 Center for Marine and Environmental Sciences (MARE), Portugal 8 Centre for Environmental and Marine Studies, Department of Chemistry, University of Aveiro, Portugal 9 National Institute of Advanced Technologies of Brittany, France 10 Center for Marine and Environmental Sciences (MARE), Portugal 11 Center for Fisheries Experimentation, Government of the Principality of Asturias, Spain 12 Department of Ecology and Animal Biology, University of Vigo, Spain 13 Department of Biochemistry, Genetics and Immunology, University of Vigo, Spain 14 Centre for Environmental and Marine Studies, Department of Chemistry, University of Aveiro, Portugal 15 Coral Reef Alliance, United States In the Atlantic Arc, the stalked barnacle fishery is managed using a variety of spatial tools ranging from open access, through Territorial User Rights for Fishers (TURFs) to Marine Reserves (MR). In addition, co-management in some places allows the emergence of new management practices, which makes this fishery an interesting example to investigate the implications of distinct spatial management options on the biology and ecology of exploited coastal species. It also provides a learning platformto guide marine spatial planning of Small Scale Fisheries in other contexts in the EU. The PERCEBES project is a Portuguese, French and Spanish initiative co-funded by the ERA-Net BiodivERsA intended as a scientific and practical demonstration of the effects of Stalked Barnacle (SB) harvesting on the biodiversity, productivity and connectivity of SB populations/stocks? both at local and landscape level. This is done through two approaches: 1-A continental-scale, Human Exclusion Experiment (HEE). By using steel cages that simulate the effects of 1 and 2 year bans and open plots as controls where harvest continues unimpeded. The HEE tests the effect of those treatments on the biodiversity, productivity and economic value of SB stands and on their potential to produce larvae. 2-Construction of regional, spatially explicit Bioeconomic Models (BM). We are building biophysical larval dispersal models to visualize the seeding effects of fallow or protected areas on other regions and the patterns of connectivity among managed or co-managed spatial units. These models are being validated by direct measurement of recruitment distributed in time and space. Additionally, the biophysical models will be coupled with landings and sales data to assess the sustainability and cost effectiveness of distinct spatial management options. These two objectives are carried out at four experimental sites: coast of Alentejo (Portugal), , NW coast of Galicia (Spain), Western Asturias coast (Spain) and South Brittany (France), covering the latitudinal range where the barnacles are exploited in the EU. PERCEBES benefits from/has the collaboration of stakeholders, fishers, administration and NGOs for site selection, experiment surveillance and sample collection. The project has established a consortium with the fishers to secure a large number of recruitment observations distributed in time and space. PERCEBES combines results from experiments, hydrodynamic models and landings data into spatially explicit bioeconomic models which will allow generation of “policyscapes” to optimize the conservation/exploitation tradeoff. This is of interest for Administrations seeking to manage the SB fishery. At a final collaborative workshop, fishers, scientists, administrators and ONGs will discuss the potential for crossbreeding of good management practices across the Atlantic Arc. PERCEBES is also producing a video documentary focused on the effects of harvesting on biodiversity patterns, intended for a general audience, and focused on the science of the interaction humans-ecosystem. Acknowledgements This is a BiodivERsA project financed by the Spanish Ministerio de Economía y Competitividad, the Portuguese Fundação para a Ciência e Tecnologia and the French Agence Nationale de la Recherche. We thank the barnacle harvesters at the Alentejo, Galicia, Asturias and Brittany coasts, WWF, Ecologistas en Acción, DOCUMENTAZUL and the different Regional Governments and Administrations for their collaboration and support. Keywords: Marine reserve (MR), Territorial User Rights Fisheries (TURFs), Co-management, biophysical model, Bioeconomic model, human exclusion experiment Conference: XX Iberian Symposium on Marine Biology Studies (SIEBM XX) , Braga, Portugal, 9 Sep - 12 Sep, 2019. Presentation Type: Poster Presentation Topic: Fisheries, Aquaculture and Biotechnology Citation: Geiger K, Acuña J, Aguión A, Julio A, Ballenghiem M, Borrell Y, Broudin C, Castro J, Chiss J, Cruz T, Davoult D, Dubert J, Dumont P, Marieke F, Fernandes J, Fernández C, García L, Garcia-Vazquez E, Houbin C, Jacinto D, Jollivet D, Lejeusne C, Macho G, Mateus D, Morán P, Muñiz C, Nicolle A, Nolasco R, Ojea E, Parrondo M, Perrier L, Queiroga H, Rico J, Rivera A, Rueda M, Silva T, Sostres J, Thiebaut E and Vazquez E (2019). The PERCEBES project: science for the spatial management of the stalked barnacle fishery in the Atlantic Arc. Front. Mar. Sci. Conference Abstract: XX Iberian Symposium on Marine Biology Studies (SIEBM XX) . doi: 10.3389/conf.fmars.2019.08.00156 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 03 Jun 2019; Published Online: 27 Sep 2019. * Correspondence: Mrs. Katja Geiger, Department of Organisms and Systems Biology, University of Oviedo, Oviedo, Spain, katjes.gecko@gmail.com Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Katja Geiger José Luis Acuña Alba Aguión Arrontes Julio Marion Ballenghiem Yaisel J. Borrell Caroline Broudin João Castro Juliette Chiss Teresa Cruz Dominique Davoult Jesus Dubert Pierre-Antoine Dumont Feis Marieke Joana N. Fernandes Consolación Fernández Lucía García Eva Garcia-Vazquez Céline Houbin David Jacinto Didier Jollivet Christophe Lejeusne Gonzalo Macho David Mateus Paloma Morán Carlota Muñiz Amandine Nicolle Rita Nolasco Elena Ojea Marina Parrondo Lucille Perrier Henrique Queiroga José Manuel Rico Antonella Rivera María Del Pino Rueda Teresa Silva Jorge Sostres Eric Thiebaut Elsa Vazquez Google Katja Geiger José Luis Acuña Alba Aguión Arrontes Julio Marion Ballenghiem Yaisel J. Borrell Caroline Broudin João Castro Juliette Chiss Teresa Cruz Dominique Davoult Jesus Dubert Pierre-Antoine Dumont Feis Marieke Joana N. Fernandes Consolación Fernández Lucía García Eva Garcia-Vazquez Céline Houbin David Jacinto Didier Jollivet Christophe Lejeusne Gonzalo Macho David Mateus Paloma Morán Carlota Muñiz Amandine Nicolle Rita Nolasco Elena Ojea Marina Parrondo Lucille Perrier Henrique Queiroga José Manuel Rico Antonella Rivera María Del Pino Rueda Teresa Silva Jorge Sostres Eric Thiebaut Elsa Vazquez Google Scholar Katja Geiger José Luis Acuña Alba Aguión Arrontes Julio Marion Ballenghiem Yaisel J. Borrell Caroline Broudin João Castro Juliette Chiss Teresa Cruz Dominique Davoult Jesus Dubert Pierre-Antoine Dumont Feis Marieke Joana N. Fernandes Consolación Fernández Lucía García Eva Garcia-Vazquez Céline Houbin David Jacinto Didier Jollivet Christophe Lejeusne Gonzalo Macho David Mateus Paloma Morán Carlota Muñiz Amandine Nicolle Rita Nolasco Elena Ojea Marina Parrondo Lucille Perrier Henrique Queiroga José Manuel Rico Antonella Rivera María Del Pino Rueda Teresa Silva Jorge Sostres Eric Thiebaut Elsa Vazquez PubMed Katja Geiger José Luis Acuña Alba Aguión Arrontes Julio Marion Ballenghiem Yaisel J. Borrell Caroline Broudin João Castro Juliette Chiss Teresa Cruz Dominique Davoult Jesus Dubert Pierre-Antoine Dumont Feis Marieke Joana N. Fernandes Consolación Fernández Lucía García Eva Garcia-Vazquez Céline Houbin David Jacinto Didier Jollivet Christophe Lejeusne Gonzalo Macho David Mateus Paloma Morán Carlota Muñiz Amandine Nicolle Rita Nolasco Elena Ojea Marina Parrondo Lucille Perrier Henrique Queiroga José Manuel Rico Antonella Rivera María Del Pino Rueda Teresa Silva Jorge Sostres Eric Thiebaut Elsa Vazquez Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.

One of the biggest challenges in understanding and managing biological invasions is the identification of the routes of introduction. This information is often incomplete because of unnoticed, unreported and, sometimes, illegal translocations. Reports on the introduction of the red swamp crayfish (Procambarus clarkii) into Europe describe that it was introduced for the first time to southern Spain (1973 and 1974) from Louisiana; from there, it rapidly spread throughout several European countries. While other importation events and pathways of introduction have been suggested in the literature, there is no evidence that these led to wild populations in Europe. Our present study suggests two additional introduction routes into Europe from non-European areas where the red swamp crayfish had previously been reported. By using mtDNA, we found a shared haplotype between the Lake Naivasha in Kenya and Western Europe, as well as another between either western United States or Asia, and Malta. These findings support historical reports found in the literature for the former case and also point towards pet trade as driver of new introductions for the latter, thus highlighting the complex introduction history of the red swamp crayfish populations in Europe.

counts. Mesozooplankton biovolumes and abundances estimated from Zooscan data. Mapping of metagenomic and metatranscriptomic reads assigned to Prochlorococcus and Synechococcus genes encoding components of iron metabolism.

Urban structures like marinas are dominant features of our coasts, often hotspots for invasive species. The processes that govern the distribution of invasive species within and between marinas are not well understood. We therefore investigated the impacts of local-scale variability within and between marinas, analysing fouling communities at two zones (inner and outer) within three close marinas in accordance with pollutants recorded in the water and sediment. Communities varied between zones, however no significant differences in abundances of invasive species was recorded. The inner zones contained higher levels of copper and other pollutants and were correlated with lower biodiversity and abundances of many species in comparison to the outer zones. Only the native Ascidiella aspersa was found in greater abundances in the inner zones. This local-scale variability and how it impacts biodiversity is important for consideration for coastal managers in mitigating the build-up of pollutants and spread of invasive species.