ORCID Profile
0000-0003-1212-1742
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Publisher: Springer Science and Business Media LLC
Date: 25-10-2017
DOI: 10.1038/S41598-017-13631-6
Abstract: Organisms develop local adaptations to cope with spatially and temporally variable environments such as estuarine habitats, where abiotic parameters such as salinity and temperature fluctuate continuously. Studying the regulation of gene expression in a variable environment allows us to understand the underlying molecular mechanisms of these adaptations and the relative roles of the genetic and plastic response. The transcriptomes of the European native Palaemon longirostris (PL) and the introduced P. macrodactylus (PM) shrimps are described and compared after an experiment simulating summer conditions in the Guadalquivir Estuary, Spain. Specimens, collected in the Guadalquivir Estuary, were maintained at a temperature and salinity of 20 °C and 5 ppt for the control, and 30 °C and 15 ppt for the stress treatment. A large amount of differential gene expression was observed: 16,013 and 2,594 for PL and PM respectively. Functionally annotated unigenes revealed some differences, with PL seemingly having to face stronger physiological stress than PM. Thus, PM seems to have greater resistance than PL under conditions of high temperature and salinity. These results constitute a step forward in the understanding of the underlying molecular mechanisms of genetic adaptation of native invertebrates, and alien taxa that have successfully invaded estuaries in temperate regions around the world.
Publisher: Springer Science and Business Media LLC
Date: 08-12-2017
DOI: 10.1038/S41598-017-17152-0
Abstract: Sharp declines in numerous shark populations around the world have generated considerable interest in better understanding and characterising their biology, ecology and critical habitats. The scalloped hammerhead shark (SHS, Sphyrna lewini ) is subject to a multitude of natural and anthropogenic threats that are often exacerbated within the coastal embayments and estuaries used during SHS early life stages. In this study, we describe the temporal and spatial distribution, age class composition, and reproductive biology of SHS in the Rewa Delta (RD), Fiji. A total of 1054 SHS (including 796 tagged in iduals 101 of which were recaptured) were captured from September 2014 to March 2016 in the RD. A majority of the captures in this area were neonates and young-of-the-year (YOY) (99.8%). Significant seasonality in patterns of occurrence of both neonates and YOY in iduals suggests a defined parturition period during the austral summer. Between the seven s ling sites in the RD we also found significant differences in SHS neonate catch per unit of effort, and average total length of in iduals. According to the data, the RD is likely to represent an important nursery area for SHS up to one year of age.
Publisher: Wiley
Date: 25-12-2022
DOI: 10.1111/MEC.16822
Abstract: The blue shark Prionace glauca is a top predator with one of the widest geographical distributions of any shark species. It is classified as Critically Endangered in the Mediterranean Sea, and Near Threatened globally. Previous genetic studies did not reject the null hypothesis of a single global population. The blue shark was proposed as a possible archetype of the “grey zone of population differentiation,” coined to designate cases where population structure may be too recent or too faint to be detected using a limited set of markers. Here, blue shark s les collected throughout its global range were sequenced using a specific RAD method (DArTseq), which recovered 37,655 genome‐wide single nucleotide polymorphisms (SNPs). Two main groups emerged, with Mediterranean Sea and northern Atlantic s les (Northern population) differentiated significantly from the Indo‐west Pacific s les (Southern population). Significant pairwise F ST values indicated further genetic differentiation within the Atlantic Ocean, and between the Atlantic Ocean and the Mediterranean Sea. Reconstruction of recent demographic history suggested ergence between Northern and Southern populations occurred about 500 generations ago and revealed a drastic reduction in effective population size from a large ancestral population. Our results illustrate the power of genome scans to detect population structure and reconstruct demographic history in highly migratory marine species. Given that the management plans of the blue shark (targeted or bycatch) fisheries currently assume panmictic regional stocks, we strongly recommend that the results presented here be considered in future stock assessments and conservation strategies.
Publisher: Magnolia Press
Date: 16-06-2022
DOI: 10.11646/ZOOTAXA.5154.4.4
Abstract: The land flatworm Obama nungara, a species originating from South America and already invasive in many European countries, is recorded from La Réunion, a French island in the Indian Ocean. This is the first record of O. nungara from this locality and also the first record of the species for Africa. Three specimens were collected in 2021 and 2022, in the communes of Saint Paul, Saint Joseph and Le T on, respectively the three localities are widely separated, with two in the Western part and one in the South-eastern part of the island. This suggests that the species is already present in several locations in La Réunion, and it is likely that the species is already present since 2020. The specimen from Saint Paul had the same cox1 haplotype as specimens previously recorded from several countries of Europe it is hypothesized that the species was imported from Europe, probably from France. We mapped climatic suitability of the species in La Réunion and found that O. nungara could potentially invade a large part of the island. One record was apparently associated with the transport of plates of travertine, a construction material which has numerous cavities thus suitable for the transport and survival of adult or cocoons of land flatworms.
Publisher: Cold Spring Harbor Laboratory
Date: 16-02-2022
DOI: 10.1101/2022.02.14.480416
Abstract: The land flatworm Obama nungara , a species originating from South America and already invasive in many European countries, is recorded from La Réunion, a French island in the Indian Ocean. This is the first record of O. nungara from this locality and also the first record of the species for Africa. Two specimens were collected, one from Petite France (commune of Saint Paul) and one from La Plaine des Grègues (commune of Saint Joseph) the two localities are widely separated, one in the Western part and one in the South-eastern part of the island. This suggests that the species is already present in several locations in La Réunion. The sightings were communicated to us in 2021, but it is likely that the species is already present since 2020. A molecular analysis of the specimen from Petite France showed that it had the same cox1 haplotype as specimens previously recorded from several countries of Europe it is hypothesized that the species was imported from Europe, probably from France. We mapped climatic suitability of the species in La Réunion and found that O. nungara could potentially invade a large part of the island. One record was apparently associated with the transport of plates of travertine, a construction material which has numerous cavities, suitable for the transport and survival of adult or cocoons of land flatworms.
Location: No location found
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