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9 Pág. Departamento de ​Mejora Genética Animal (INIA), Uniformity of body weight is a trait of great economic importance in the production of white shrimp (Litopenaeus vannamei). A necessary condition to improve this trait through selective breeding is the existence of genetic variability for the environmental variance of body weight. Although several studies have reported such variability in other aquaculture species, to our knowledge, no estimates are available for shrimp. Our aim in this study was to estimate the genetic variance for weight uniformity in a farmed population of shrimp to determine the potential of including this trait in the selection program. We also estimated the genetic correlation of weight uniformity between two environments (selection nucleus and commercial population)., This work was funded by the Ministerio de Ciencia, Innovación y Universidades, Spain (Grant CGL2016-75904-C2-2-P), fondos FEDER and the Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (FPI-SGIT2016-02).

The Mediterranean area, from southern Balkans to western Maghreb, is inhabited by the Potamon subgenus Euthelphusa, with three currently recognised species. The Maghrebian species P. (E.) algeriense is isolated from other Potamon species by the Mediterranean Sea and the Sahara Desert, and nearly no molecular data are currently available for this taxon. Present study investigated the mtDNA and nuDNA diversity in Potamon algeriense s.l. with the aims of exploring its molecular diversity pattern throughout its known distribution range, and testing the possible presence of cryptic taxa currently lumped under this binomen. The phylogenetic and DNA taxonomy analyses showed the presence of two well‐supported clades of species rank within P. algeriense s.l, with an eastern clade including the populations from Tunisia and Numidia, and a western, highly structured clade including the populations from central Algeria and Morocco. In agreement with a typical Maghrebian biogeographic pattern, the distribution of these two species shows a clear east–west divide, with a disjunction zone located in Kabylia, and a strong link between molecular diversity and segregation within different hydrographical basins is evident. The Maghreb thus proved to host an unexpectedly high genetic diversity of, and to constitute a biodiversity hot‐spot for, the Potamon subgenus Euthelphusa. In the light of the existence of two well‐characterised species currently lumped under P. algeriense s.l., and of their noteworthy molecular structuring, the status of Maghrebian Potamon populations should be re‐assessed for both the species present in the area, which are to be considered as independent management units.

Ranging from the Jurassic to the Pleistocene, the fossil record of decapod crustaceans in the British Isles is extensive, comprised of 159 species (including those in open nomenclature) assigned to 101 genera. Preservation is variable, but most taxa are based upon carapace material; the study of disarticulated limb elements has added surprisingly little to the known diversity. No new taxa are erected herein, but some species have been reassigned to more appropriate genera and/or families. The stratigraphic distribution of these crustaceans is such that most, if not all, species are known from the Mesozoic and Cenozoic successions of southern and eastern England. Some areas and horizons are particularly rich in decapod species, including the Aptian Atherfield Clay Formation, Isle of Wight; the Albian Gault Clay Formation; the Cenomanian Beer Head Limestone Formation, Wilmington Sands Member; the Lower Eocene London Clay Formation; the Paleogene of the Isle of Wight; and the various crag formations of East Anglia.

Information about the dietary composition of a species is crucial to understanding their position and role in the food web. Increasingly, molecular approaches such as DNA metabarcoding are used in studying trophic relationships, not least because they may alleviate problems such as low taxonomic resolution or underestimation of digestible taxa in the diet. Here, we used DNA metabarcoding with universal primers for cytochrome c oxidase I (COI) to study the diet composition of the northern shrimp (Pandalus borealis), an Arctic keystone species with large socio-economic importance. Across locations, jellyfish and chaetognaths were the most important components in the diet of P. borealis, jointly accounting for 40%–60% of the total read abundance. This dietary importance of gelatinous zooplankton contrasts sharply with published results based on stomach content analysis. At the same time, diet composition differed between fjord and shelf locations, pointing to different food webs supporting P. borealis in these two systems. Our study underlines the potential of molecular approaches to provide new insights into the diet of marine invertebrates that are difficult to obtain with traditional methods, and calls for a revision of the role of gelatinous zooplankton in the diet of the key Arctic species P. borealis, and in extension, Arctic food webs.

14 pages, 4 figures, 2 tables, supplementary information https://doi.org/10.1038/s41598-022-13941-4.-- Data availability: The datasets generated and/or analysed during the current study are available in the GenBank repository, accession numbers: OM241982–OM242947, An interesting evolutionary question that still remains open is the connectivity between marine populations. Marine currents can favour the dispersal of larvae or adults, but they can also produce eddies and gyres generating oceanographic fronts, thus limiting gene flow. To address this subject, we selected the Atlantic-Mediterranean transition, where several fronts are located: Gibraltar Strait (GS), Almeria-Oran Front (AOF) and Ibiza Channel (IC). Seven populations of the marine crab Liocarcinus depurator (Cadiz, West and East Alboran, Alacant, Valencia, Ebro Delta and North Catalonia) located along this transition were analysed in six consecutive years (2014–2019) using a fragment of the COI (Cytochrome Oxidase subunit I) gene. All sequences (966) belonged to two well defined haplogroups: ATL (most abundant in Atlantic waters) and MED (predominant in Mediterranean waters). Following a geographic variation, the frequency of ATL decreased significantly from Cadiz to North Catalonia. However, this variation presented steps due to the effect of oceanographic restrictions/fronts. Significant effects were recorded for GS (2015, 2017, 2018 and 2019), AOF (all years except 2018) and IC (2016). The intensity and precise location of these fronts changed over time. Multivariate analyses distinguished three main population groups: Cadiz, Alboran Sea and the remaining Mediterranean populations. These findings could be relevant to properly define Marine Protected Areas and for conservation and fisheries policies, This research was financially supported by the projects CTM2015-66400-C3-3-R founded by MINECO/FEDER, CTM2017‐88080 funded by the CIN/AEI/https://doi.org/10.13039/501100011033 and by ERDF 'A way of making Europe' of the European Union, the project PID2020-118550RB funded by the MCIN/AEI/https://doi.org/10.13039/501100011033 and by the project 2017SGR 1120 (Generalitat de Catalunya, Spain). Partial support was also provided by the Spanish Government through the “Severo Ochoa Centre of Excellence” accreditation (CEX2019-000928-S) to the Institut de Ciències del Mar (ICM-CSIC)

Here we report the mitogenome of Potamon fluviatile collected from the Maltese islands, representing the first such study on species from the subfamily Potaminae. The mitogenome was analysed through next-generation sequencing and annotated. The genome was found to contain 37 genes that include 13 protein coding genes, 22 tRNA genes, two rRNA genes and a non-coding region. The gene order was compared to that of other Potamidae species, while protein coding and rRNA genes were used to evaluate the phylogenetic position of Potamon with other species of freshwater crabs. The phylogenetic analysis shows that the subfamily Potaminae, here represented by P. fluviatile, forms a distinct clade from its sister subfamily Potamiscinae, with the two sharing common ancestry within the family Potamidae. This study contributes to the genetic resources available for the genus Potamon., peer-reviewed

Background: Paragonimus spp. are trematode parasites that infect human populations worldwide. It is believed that infection rates within Asia reach five to ten percent of the total population. Three of the largest areas of possible infection are Asia, Central and South America as well as Africa, where the total population at risk is estimated to be 293 million people. Humans are infected via ingestion of raw or undercooked decapod crustaceans. Objective: To identify the presence of Paragonimus spp. in crabs from Bogota, Colombia. Methods: The native crab Neostrengeria macropa and the aquatic invasive crayfish Procambarus clarkii in Bogota, Colombia, were collected from local markets, pet stores and waterways and dissected to assess the presence of Paragonimus spp. Results: The native crab species, N. macropa (n=29) had an infection prevalence of 17.2%, while the invasive crayfish species, P. clarkii (n=22), had a prevalence of 36.4% combined from both field captured animals and purchased samples. Conclusion: Although the estimated prevalence is lower compared to previous studies in other cities of Colombia, Paragonimus represent a risk to human health. Several environmental factors may contribute to the difference in prevalence including collecting season, rainfall, temperature, altitude and the El Nino Southern Oscillation. Keywords: crabs, invasive species, Neostrengeria macropa , Procambarus clarkii , trematode. Resumen Antecedentes: Los Paragonimus spp. constituyen un grupo de parasitos trematodos que infectan a humanos en todo el mundo. Se considera que entre 5 y 10% de la poblacion humana de Asia esta infectada. Las areas con mayor posibilidad de infeccion son Asia, Centro y Sur America, asi como Africa. Se estima que 293 millones de personas estan en riesgo de infeccion. Los humanos se pueden infectar al consumir crustaceos decapodos crudos. Objetivo: Identificar la presencia de Paragonimus spp. en crustaceos en Bogota, Colombia. Metodos: Una muestra de cangrejos nativos Neostrengeria macropa y de decapodos invasores Procambarus clarkii fue colectada tanto en mercados locales de Bogota, como en tiendas de mascotas, rios, y quebradas. Posteriromente fueron diseccionados para detectar la presencia de Paragonimus spp. Resultados: La prevalencia de la infeccion en N. macropa (n=29) fue de 17,2%, y en la especie invasora, P. clarkii (n=22), fue de 36,4% (porcentaje combinado de los animales colectados en el campo y los comprados en tiendas). Conclusion: Aunque la prevalencia en este estudio fue mas baja que la de otras investigaciones relacionadas, se considera que existe riesgo para la salud humana. Es probable que algunos factores medio ambientales hayan contribuido a la diferencia, incluyendo: temporada de colecta, nivel de lluvias, temperatura, altura, y el fenomeno El Nino. Palabras claves : cangrejos, especie invasora, Neostrengeria macropa , Procambarus clarkii , trematodo. Resumo Antecedentes: Paragonimus spp. sao trematodeos parasitas que infectam populacoes humanas ao redor do mundo. Acredita-se que as taxas de infeccao na Asia atingem de 5 a 10% da populacao. As tres maiores areas de infeccao se localizam na Asia, Americas do Sul e Central e Africa, onde a populacao total em risco e estimada em 293 milhoes de pessoas. Os humanos sao infectados pela ingestao de crustaceos decapodes crus ou mal cozidos. Objetivo: Identificar a presenca de Paragonimus spp. em Bogota, Colombia. Metodos: Individuos de caranguejo nativo Neostrengeria macropa e lagostim aquatico invasivo Procambarus clarkii foram coletados em mercados locais, lojas de animais de estimacao e cursos de agua em Bogota (Colombia) e posteriormente dissecados para verificacao da presenca de Paragonimus spp. Resultados: A especie de caranguejo nativa N. macropa (n=29) apresentou prevalencia de infeccao de 17,2%, enquanto a especie de lagostim invasivo, P. clarkii (n=22), apresentou prevalencia de 36,4%, quando combinados os animais capturados em campo e os animais comprados. Conclusao: Embora a prevalencia estimada neste estudo foi menor do que a de pesquisas anteriores realizadas em outras cidades da Colombia, existe um risco para a saude humana. Ha inumeros fatores ambientais que podem contribuir para a diferenca de prevalencia, dentre eles: a estacao em que a coleta foi realizada, pouca precipitacao, temperatura, altitude e a Oscilacao Sul-El Nino. Palabras-chave: caranguejos, especies invasivas, Neostrengeria macropa , Procambarus clarkii , trematodeos.

In the majority of species and genus names in Decapoda Crustacea, the author(s) of the name equate with the author(s) of the work. In a relatively small number of cases, however, the author(s) of the name are either a subset of the authors of the work or are not an author on the work—a phenomenon herein termed “innies”. We demonstrate that these two categories should be differentially interpreted according to Articles 50.1 and 50.1.1 of the ICZN Code. To promote stability in cited authorship of historical names, it is proposed that 1) if the author(s) of the name are also an author on the work, these should be universally accepted as “innies”, irrespective of any further explanation in the text (including a mere attribution following the taxon name); and 2) that if the author(s) of the name are not an author(s) of the work, these should only be considered as “innies” if a more expansive explanation is given in the text, not merely an attribution of authorship to the taxon name.

Deltas are home to a large and growing proportion of the world's population, often living in conditions of extreme poverty. Deltaic ecosystems are ecologically significant as they support high biodiversity and a variety of fisheries, however these coastal environments are extremely vulnerable to climate change. The Ganges-Brahmaputra-Meghna (Bangladesh/India), the Mahanadi (India), and the Volta (Ghana) are among the most important and populous delta regions in the world and they are all considered at risk of food insecurity and climate change. The fisheries sector is vital for populations that live in the three deltas, as a source of animal protein (in Bangladesh and Ghana around 50 60% of animal protein is supplied by fish while in India this is about 12%) through subsistence fishing, as a source of employment and for the wider economy. The aquaculture sector shows a rapid growth in Bangladesh and India while in Ghana this is just starting to expand. The main exported species differ across countries with Ghana and India dominated by marine fish species, whereas Bangladesh exports shrimps and prawns. Fisheries play a more important part in the economy of Bangladesh and Ghana than for India, both men and women work in fisheries, with a higher proportion of women in the Volta then in the Asian deltas. Economic and integrated modelling using future scenarios suggest that changes in temperature and primary production could reduce fish productivity and fisheries income especially in the Volta and Bangladesh deltas, however these losses could be mitigated by reducing overfishing and improving management. The analysis provided in this paper highlights the importance of applying plans for fisheries management at regional level. Minimizing the impacts of climate change while increasing marine ecosystems resilience must be a priority for scientists and governments before these have dramatic impacts on millions of people's lives. © 2018 Elsevier B.V. Jose A. Fernandes received further funding through the Gipuzkoa Talent Fellowships programme, by the Gipuzkoa Provincial Council, Spain.