Palaemon

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Sammy De Grave - One of the best experts on this subject based on the ideXlab platform.

Enrique Gonzalezortegon - One of the best experts on this subject based on the ideXlab platform.

  • mitogenome phylogenetics in the genus Palaemon crustacea decapoda sheds light on species crypticism in the rockpool shrimp p elegans
    PLOS ONE, 2020
    Co-Authors: Ines Gonzalezcastellano, Enrique Gonzalezortegon, Joan Pons, Andres Martinezlage
    Abstract:

    The genus Palaemon comprises worldwide marine and freshwater shrimps and prawns, and some of them are ecologically or commercially important species. Palaemon is not currently a monophyletic group, so phylogenetics and systematics are constantly changing. Species crypticism has been pointed out in several Palaemon species, being the clearest evidence in the European rockpool shrimp P. elegans. Here we sequenced and described seven European Palaemon mitochondrial genomes. The mitochondrial protein-coding genes were used, along with those of three other Palaemon species, to perform mitogenome phylogenetic analyses to clarify the evolutionary relationships within the genus, and particularly to shed light on the cryptic species found within P. elegans. The Messinian Salinity Crisis (5.3-5.9 Ma, late Miocene) was proposed to be the origin of this cryptic species and it was used as aged constraint for calibration analysis. We provide the largest and the first time-calibrated mitogenome phylogeny of the genus Palaemon and mitogenome substitution rate was estimated (1.59% per million years) in Decapoda for the first time. Our results highlighted the need for future systematics changes in Palaemon and crypticism in P. elegans was confirmed. Mitochondrial genome and cox1 (1.41%) substitution rate estimates matched those published elsewhere, arguing that the Messinian Salinity Crisis was a plausible event driving the split between P. elegans and its cryptic species. Molecular dating suggested that Pleistocene glaciations were likely involved in the differentiation between the Atlantic and Mediterranean populations of P. elegans. On the contrary, the divergence between the Atlantic and Mediterranean populations of the common littoral shrimp P. serratus was greater and dated to be much older (4.5-12.3 Ma, Plio-Miocene), so we considered that they could represent two separated species. Therefore, species crypticism in the genus Palaemon seems to be a common phenomenon.

  • comparative cytogenetic analysis of marine Palaemon species reveals a x1x1x2x2 x1x2y sex chromosome system in Palaemon elegans
    Frontiers in Zoology, 2017
    Co-Authors: Zeltia Torrecilla, Enrique Gonzalezortegon, Andres Martinezlage, Alejandra Perina, Ana M Gonzaleztizon
    Abstract:

    The maintenance of species and the promotion of speciation are closely related to chromosomal rearrangements throughout evolution. Decapoda represents the most species-rich order among crustaceans and, despite its ecological and economic importance, little is known about decapod karyology. We aim at cytogenetically characterizing two sympatric prawn species. Analysis of mitotic metaphases and meiotic diakinesis of the common prawn Palaemon serratus and the rockpool prawn P. elegans, revealed considerable differences between their karyotypes including chromosome numbers and sex determination systems. The cytogenetic data for P. serratus showed a diploid number of 56 and the putative absence of heteromorphic sex chromosomes. However, the diploid chromosome number in P. elegans was 90 for females and 89 for males. The karyotype of the females consisted of the three largest acrocentric pairs and 42 submetacentric and metacentric pairs, while the karyotype of the males comprised a clearly identifiable large metacentric chromosome and two acrocentric pairs as well as the smaller 42 pairs. These results highlight the presence of the X1X1X2X2/X1X2Y multiple sex chromosome system in P. elegans, which constitute the only sexual system for Decapoda reported cytogenetically using modern techniques. The origin of this sex chromosome system is discussed. We hypothesize that the chromosome evolution within the genus could involve several fusion events giving rise to a reduction on the chromosome number in P. serratus. In both species, the major ribosomal genes were located in two chromosome pairs and hybridization signals of the telomeric sequences (TTAGGG)n were visualized at the telomeres of all chromosomes. C-banding revealed that, when present, constitutive heterochromatin had a predominantly telomeric distribution and no centromeric constitutive heterochromatin was observed. Although more comparative cytogenetic analyses are needed to clarify our hypotheses, the findings of this work indicate that the prawns of the genus Palaemon represent a promising model among Decapoda representatives to investigate the karyotype evolution and the patterns of sex chromosome differentiation.

  • genetic differentiation between mediterranean and atlantic populations of the common prawn Palaemon serratus crustacea Palaemonidae reveals uncommon phylogeographic break
    Journal of the Marine Biological Association of the United Kingdom, 2017
    Co-Authors: Ronja Weiss, Enrique Gonzalezortegon, Andres Martinezlage, Zeltia Torrecilla, Ana M Gonzaleztizon, Christoph D. Schubart
    Abstract:

    The Atlantic–Mediterranean transition zone between the Alboran Sea and the Gulf of Cadiz constitutes the most prominent marine geographic barrier in European waters and includes known phylogeographic breaks such as the Strait of Gibraltar and the Almeria-Oran Front. A genetic shift in this area has been previously documented for the European littoral shrimp Palaemon elegans. Here we carried out a phylogeographic analysis with the congeneric and sympatric species Palaemon serratus to test for similar intraspecific genetic differentiation and geographic structure. This littoral prawn is distributed in the Northeastern Atlantic Ocean, the Mediterranean Sea and the Black Sea. We compared DNA sequences from the mitochondrial genes Cox1 and to a lesser extent from 16S rRNA of several Atlantic and Mediterranean populations. Furthermore, sequences from the nuclear gene Enolase were included for corroborating differences between Mediterranean and Atlantic individuals. A pronounced genetic differentiation was detected between the Mediterranean and Atlantic populations, amounting to 10.14% in Cox1 and 2.0% in 16S, indicating the occurrence of two independent evolutionary lineages. Interestingly, specimens from the Atlantic Gulf of Cadiz cluster together with the Mediterranean individuals, indicating that a biogeographic barrier appears to be located west of the Strait of Gibraltar.

  • individual and mixture effects of selected pharmaceuticals on larval development of the estuarine shrimp Palaemon longirostris
    Science of The Total Environment, 2016
    Co-Authors: Enrique Gonzalezortegon, Julian Blasco, Elena Nieto, Miriam Hampel, Lewis Le Vay, Luis Gimenez
    Abstract:

    Abstract Few ecotoxicological studies incorporate within the experimental design environmental variability and mixture effects when assessing the impact of pollutants on organisms. We have studied the combined effects of selected pharmaceutical compounds and environmental variability in terms of salinity and temperature on survival, development and body mass of larvae of the estuarine shrimp Palaemon longirostris. Drug residues found in coastal waters occur as mixture, and the evaluation of combined effects of simultaneously occurring compounds is indispensable for their environmental risk assessment. All larval stages of P. longirostris were exposed to the nonsteroidal anti-inflammatory drug (NSAID) diclofenac sodium (DS: 40 and 750 μg L− 1), the lipid regulator clofibric acid (CA: 17 and 361 μg L− 1) and the fungicide clotrimazole (CLZ: 0.14 and 4 μg L− 1). We observed no effect on larval survival of P. longirostris with the tested pharmaceuticals. However, and in contrast to previous studies on larvae of the related marine species Palaemon serratus, CA affected development through an increase in intermoult duration and reduced growth without affecting larval body mass. These developmental effects in P. longirostris larvae were similar to those observed in the mixture of DS and CA confirming the toxic effects of CA. In the case of CLZ, its effects were similar to those observed previously in P. serratus: high doses affected development altering intermoult duration, tended to reduce the number of larval instars and decreased significantly the growth rate. This study suggests that an inter-specific life histories approach should be taken into account to assess the effect of emergent compounds in coastal waters.

  • field distribution and osmoregulatory capacity of shrimps in a temperate european estuary sw spain
    Estuarine Coastal and Shelf Science, 2006
    Co-Authors: Enrique Gonzalezortegon, Jose A Cuesta, E Pascual, Pilar Drake
    Abstract:

    The spatial distribution of the six most common crustacean decapods in the benthos and hyperbenthos of the Guadalquivir estuary (SW Spain) has been analysed in relation to their osmoregulatory capacities (at 20 °C). Field densities along the estuarine salinity gradient revealed that, although the species studied showed salinity tolerance ranges in the field that do overlap to some extent, there was a considerable spatial and/or salinity-related segregation between several of them. Concerning their isosmotic points and their osmoregulatory salinity ranges, two main groups of species were distinguished: species with higher isosmotic points and tight ranges in osmoregulation, represented by marine species that entered the estuary from open sea and remained there for only part of the year (Crangon crangon, Melicertus kerathurus and Palaemon serratus); and those with slightly lower isosmotic points and wide ranges in osmoregulation, represented by estuarine species which completed their life cycle in brackish water (Palaemon longirostris, Palaemon macrodactylus and Palaemonetes varians). For all the species studied, their field distributions were clearly biased towards the lower end of the salinity ranges within which they osmoregulate. Nevertheless, individuals of the less euryhaline species (M. kerathurus and P. serratus) were mainly found in less saline water when the estuarine gradient was displaced downstream and low salinities occurred close to the river mouth.

Andres Martinezlage - One of the best experts on this subject based on the ideXlab platform.

  • mitogenome phylogenetics in the genus Palaemon crustacea decapoda sheds light on species crypticism in the rockpool shrimp p elegans
    PLOS ONE, 2020
    Co-Authors: Ines Gonzalezcastellano, Enrique Gonzalezortegon, Joan Pons, Andres Martinezlage
    Abstract:

    The genus Palaemon comprises worldwide marine and freshwater shrimps and prawns, and some of them are ecologically or commercially important species. Palaemon is not currently a monophyletic group, so phylogenetics and systematics are constantly changing. Species crypticism has been pointed out in several Palaemon species, being the clearest evidence in the European rockpool shrimp P. elegans. Here we sequenced and described seven European Palaemon mitochondrial genomes. The mitochondrial protein-coding genes were used, along with those of three other Palaemon species, to perform mitogenome phylogenetic analyses to clarify the evolutionary relationships within the genus, and particularly to shed light on the cryptic species found within P. elegans. The Messinian Salinity Crisis (5.3-5.9 Ma, late Miocene) was proposed to be the origin of this cryptic species and it was used as aged constraint for calibration analysis. We provide the largest and the first time-calibrated mitogenome phylogeny of the genus Palaemon and mitogenome substitution rate was estimated (1.59% per million years) in Decapoda for the first time. Our results highlighted the need for future systematics changes in Palaemon and crypticism in P. elegans was confirmed. Mitochondrial genome and cox1 (1.41%) substitution rate estimates matched those published elsewhere, arguing that the Messinian Salinity Crisis was a plausible event driving the split between P. elegans and its cryptic species. Molecular dating suggested that Pleistocene glaciations were likely involved in the differentiation between the Atlantic and Mediterranean populations of P. elegans. On the contrary, the divergence between the Atlantic and Mediterranean populations of the common littoral shrimp P. serratus was greater and dated to be much older (4.5-12.3 Ma, Plio-Miocene), so we considered that they could represent two separated species. Therefore, species crypticism in the genus Palaemon seems to be a common phenomenon.

  • comparative cytogenetic analysis of marine Palaemon species reveals a x1x1x2x2 x1x2y sex chromosome system in Palaemon elegans
    Frontiers in Zoology, 2017
    Co-Authors: Zeltia Torrecilla, Enrique Gonzalezortegon, Andres Martinezlage, Alejandra Perina, Ana M Gonzaleztizon
    Abstract:

    The maintenance of species and the promotion of speciation are closely related to chromosomal rearrangements throughout evolution. Decapoda represents the most species-rich order among crustaceans and, despite its ecological and economic importance, little is known about decapod karyology. We aim at cytogenetically characterizing two sympatric prawn species. Analysis of mitotic metaphases and meiotic diakinesis of the common prawn Palaemon serratus and the rockpool prawn P. elegans, revealed considerable differences between their karyotypes including chromosome numbers and sex determination systems. The cytogenetic data for P. serratus showed a diploid number of 56 and the putative absence of heteromorphic sex chromosomes. However, the diploid chromosome number in P. elegans was 90 for females and 89 for males. The karyotype of the females consisted of the three largest acrocentric pairs and 42 submetacentric and metacentric pairs, while the karyotype of the males comprised a clearly identifiable large metacentric chromosome and two acrocentric pairs as well as the smaller 42 pairs. These results highlight the presence of the X1X1X2X2/X1X2Y multiple sex chromosome system in P. elegans, which constitute the only sexual system for Decapoda reported cytogenetically using modern techniques. The origin of this sex chromosome system is discussed. We hypothesize that the chromosome evolution within the genus could involve several fusion events giving rise to a reduction on the chromosome number in P. serratus. In both species, the major ribosomal genes were located in two chromosome pairs and hybridization signals of the telomeric sequences (TTAGGG)n were visualized at the telomeres of all chromosomes. C-banding revealed that, when present, constitutive heterochromatin had a predominantly telomeric distribution and no centromeric constitutive heterochromatin was observed. Although more comparative cytogenetic analyses are needed to clarify our hypotheses, the findings of this work indicate that the prawns of the genus Palaemon represent a promising model among Decapoda representatives to investigate the karyotype evolution and the patterns of sex chromosome differentiation.

  • genetic differentiation between mediterranean and atlantic populations of the common prawn Palaemon serratus crustacea Palaemonidae reveals uncommon phylogeographic break
    Journal of the Marine Biological Association of the United Kingdom, 2017
    Co-Authors: Ronja Weiss, Enrique Gonzalezortegon, Andres Martinezlage, Zeltia Torrecilla, Ana M Gonzaleztizon, Christoph D. Schubart
    Abstract:

    The Atlantic–Mediterranean transition zone between the Alboran Sea and the Gulf of Cadiz constitutes the most prominent marine geographic barrier in European waters and includes known phylogeographic breaks such as the Strait of Gibraltar and the Almeria-Oran Front. A genetic shift in this area has been previously documented for the European littoral shrimp Palaemon elegans. Here we carried out a phylogeographic analysis with the congeneric and sympatric species Palaemon serratus to test for similar intraspecific genetic differentiation and geographic structure. This littoral prawn is distributed in the Northeastern Atlantic Ocean, the Mediterranean Sea and the Black Sea. We compared DNA sequences from the mitochondrial genes Cox1 and to a lesser extent from 16S rRNA of several Atlantic and Mediterranean populations. Furthermore, sequences from the nuclear gene Enolase were included for corroborating differences between Mediterranean and Atlantic individuals. A pronounced genetic differentiation was detected between the Mediterranean and Atlantic populations, amounting to 10.14% in Cox1 and 2.0% in 16S, indicating the occurrence of two independent evolutionary lineages. Interestingly, specimens from the Atlantic Gulf of Cadiz cluster together with the Mediterranean individuals, indicating that a biogeographic barrier appears to be located west of the Strait of Gibraltar.

Christopher W Ashelby - One of the best experts on this subject based on the ideXlab platform.

  • validation of Palaemon audouini heller 1861 crustacea decapoda Palaemonidae an overlooked species from the red sea
    Zoology in The Middle East, 2020
    Co-Authors: Sammy De Grave, Christopher W Ashelby
    Abstract:

    The shrimp species Palaemon audouini Heller, 1861, described from the Red Sea, has long been considered a nomen dubium but examination of the type material in the zoological collections of the Natu...

  • notes on the shrimp genus Palaemon weber 1795 crustacea decapoda Palaemonidae and related genera from taiwan
    Zootaxa, 2018
    Co-Authors: Christopher W Ashelby, Sammy De Grave, Weicheng Lin, Tinyam Chan
    Abstract:

    The shrimp genus Palaemon Weber, 1795 and its related genera in Taiwan are reviewed based on newly collected specimens, whilst older records are critically reviewed. Five genera and 11 species are now known to occur in Taiwan, although there are no recent records for Palaemon modestus (Heller, 1862), which could be nationally extinct. The records of P. debilis Dana, 1852 and NematoPalaemon tenuipes (Henderson, 1893) in Taiwan are confirmed. Three genera, namely Brachycarpus Spence Bate, 1888, Leander Desmarest, 1849 and Leandrites Holthuis, 1950, each with one species are reported for the first time from Taiwan.

  • a re appraisal of the systematic status of selected genera in Palaemoninae crustacea decapoda Palaemonidae
    Zootaxa, 2013
    Co-Authors: Sammy De Grave, Christopher W Ashelby
    Abstract:

    Recent phylogenetic work (Ashelby et al., 2012) has demonstrated the need for a fresh appraisal of the systematic status of some Palaemoninae genera. In the present contribution the accumulated morphological as well as molecular evidence is reviewed. The genera Palaemonetes, ExoPalaemon and Coutierella are demonstrated to be junior synonyms of Palaemon, which now contains 83 species. As a result of this systematic re-arrangement, two replacement names are needed. Palaemon kwantung nom. nov. now replaces ExoPalaemon guangdongensis Guo, Wang & Zhang, 2005, nec Palaemon guangdongensis Liu, Liang & Yan, 1990. Palaemon mundusnovus nom. nov. is the replacement name for Palaemonetes intermedius Holthuis, 1949, nec Palaemon intermedius (Stimpson, 1860).

  • the global invader Palaemon macrodactylus decapoda Palaemonidae an interrogation of records and a synthesis of data
    Crustaceana, 2013
    Co-Authors: Magnus L Johnson, Sammy De Grave, Christopher W Ashelby
    Abstract:

    In the latter half of the 20th Century and the early part of the 21st the Asian shrimp species Palaemon macrodactylus began being reported from several world-wide locations. Literature records of Palaemon macrodactylus are herein collated, corroborated through examination of material where possible. Material from each main occupied region has been verified as P. macrodactylus, but records from Taiwan and Darwin do not refer to P. macrodactylus. Some records still require verification in the absence of material examined. The data show that, in most cases, the first occurrence of P. macrodactylus in a region is several years prior to the detection of the species. Biological, ecological and physiological aspects of the species are summarised to gain an understanding of why the species is such a successful invader. However, the factors favouring the introduction of P. macrodactylus over other species of Palaemon remain unclear as many traits are shared with other species of the genus. Information on larval tolerances may provide further clues for the success of P. macrodactylus. We hypothesise that the global distribution of the species has been achieved through a combination of at least three primary introductions from Asia and three secondary introductions, but the origin of the Argentinean population remains unclear. Small-scale secondary introductions have likely aided spread within a region. Regions at risk of invasion by P. macrodactylus include the Baltic Sea, southern Norway and South Africa, whilst further spread within occupied, broad regions should be expected.

  • regional scale speciation reveals multiple invasions of freshwater in Palaemoninae decapoda
    Zoologica Scripta, 2012
    Co-Authors: Christopher W Ashelby, Sammy De Grave, Timothy J Page, Jane Hughes, Magnus L Johnson
    Abstract:

    Ashelby, C.W., Page, T.J., De Grave, S., Hughes, J.M. & Johnson, M.L. (2012) Regional scale speciation reveals multiple invasions of freshwater in Palaemoninae (Decapoda). —Zoologica Scripta, 41, 293–306. The generic level, systematic relationship in Palaemoninae was inferred from analyses based on the mitochondrial 16S rDNA and nuclear Histone (H3) genes, primarily focussed on the genera Palaemon and Palaemonetes, as previous morphological and molecular studies indicated potential paraphyly in some genera. Palaemonetes, ExoPalaemon, Coutierella and certain Palaemon recover as a strongly supported monophyletic clade, but with the exception of Palaemon concinnus, P. pandaliformis and P. gracilis. Within this clade, six major clades are identified with geographic relationships appearing stronger than generic relationships. The data strongly suggest that Palaemon, Palaemonetes, ExoPalaemon and Coutierella are synonymous and that the morphological characters currently used to define these genera require re-evaluation. Freshwater species are not closely related to each other, but instead group with geographically close marine species, suggesting multiple invasions of freshwater by physiologically plastic ancestors rather than a single colonisation event with subsequent speciation.

Martínez-lage Andrés - One of the best experts on this subject based on the ideXlab platform.

  • Mitogenome Phylogenetics in the Genus "Palaemon" (Crustacea: Decapoda) Sheds Light on Species Crypticism in the Rockpool Shrimp "P. Elegans"
    'Public Library of Science (PLoS)', 2020
    Co-Authors: González-castellano Inés, González-ortegón Enrique, Pons Joan, Martínez-lage Andrés
    Abstract:

    [Abstract] The genus Palaemon comprises worldwide marine and freshwater shrimps and prawns, and some of them are ecologically or commercially important species. Palaemon is not currently a monophyletic group, so phylogenetics and systematics are constantly changing. Species crypticism has been pointed out in several Palaemon species, being the clearest evidence in the European rockpool shrimp P. elegans. Here we sequenced and described seven European Palaemon mitochondrial genomes. The mitochondrial protein-coding genes were used, along with those of three other Palaemon species, to perform mitogenome phylogenetic analyses to clarify the evolutionary relationships within the genus, and particularly to shed light on the cryptic species found within P. elegans. The Messinian Salinity Crisis (5.3-5.9 Ma, late Miocene) was proposed to be the origin of this cryptic species and it was used as aged constraint for calibration analysis. We provide the largest and the first time-calibrated mitogenome phylogeny of the genus Palaemon and mitogenome substitution rate was estimated (1.59% per million years) in Decapoda for the first time. Our results highlighted the need for future systematics changes in Palaemon and crypticism in P. elegans was confirmed. Mitochondrial genome and cox1 (1.41%) substitution rate estimates matched those published elsewhere, arguing that the Messinian Salinity Crisis was a plausible event driving the split between P. elegans and its cryptic species. Molecular dating suggested that Pleistocene glaciations were likely involved in the differentiation between the Atlantic and Mediterranean populations of P. elegans. On the contrary, the divergence between the Atlantic and Mediterranean populations of the common littoral shrimp P. serratus was greater and dated to be much older (4.5-12.3 Ma, Plio-Miocene), so we considered that they could represent two separated species. Therefore, species crypticism in the genus Palaemon seems to be a common phenomenon.Ministerio de Economía y Competitividad; CTM2014-53838-RXunta de Galicia; ED431C 2018/S

  • Mitogenome Phylogenetics in the Genus Palaemon (Crustacea: Decapoda) Sheds Light on Species Crypticism in the Rockpool Shrimp P. Elegans
    'Public Library of Science (PLoS)', 2020
    Co-Authors: González-castellano Inés, González-ortegón Enrique, Pons Joan, Martínez-lage Andrés
    Abstract:

    [Abstract] The genus Palaemon comprises worldwide marine and freshwater shrimps and prawns, and some of them are ecologically or commercially important species. Palaemon is not currently a monophyletic group, so phylogenetics and systematics are constantly changing. Species crypticism has been pointed out in several Palaemon species, being the clearest evidence in the European rockpool shrimp P. elegans. Here we sequenced and described seven European Palaemon mitochondrial genomes. The mitochondrial protein-coding genes were used, along with those of three other Palaemon species, to perform mitogenome phylogenetic analyses to clarify the evolutionary relationships within the genus, and particularly to shed light on the cryptic species found within P. elegans. The Messinian Salinity Crisis (5.3-5.9 Ma, late Miocene) was proposed to be the origin of this cryptic species and it was used as aged constraint for calibration analysis. We provide the largest and the first time-calibrated mitogenome phylogeny of the genus Palaemon and mitogenome substitution rate was estimated (1.59% per million years) in Decapoda for the first time. Our results highlighted the need for future systematics changes in Palaemon and crypticism in P. elegans was confirmed. Mitochondrial genome and cox1 (1.41%) substitution rate estimates matched those published elsewhere, arguing that the Messinian Salinity Crisis was a plausible event driving the split between P. elegans and its cryptic species. Molecular dating suggested that Pleistocene glaciations were likely involved in the differentiation between the Atlantic and Mediterranean populations of P. elegans. On the contrary, the divergence between the Atlantic and Mediterranean populations of the common littoral shrimp P. serratus was greater and dated to be much older (4.5-12.3 Ma, Plio-Miocene), so we considered that they could represent two separated species. Therefore, species crypticism in the genus Palaemon seems to be a common phenomenon.Ministerio de Economía y Competitividad; CTM2014-53838-RXunta de Galicia; ED431C 2018/57This work was funded by a CTM2014-53838-R grant from the Spanish Government (Ministerio de Economía y Competitividad) and by a ED431C 2018/S7 grant from Xunta de Galici

  • Mitogenome phylogenetics in the genus Palaemon (Crustacea: Decapoda) sheds light on species crypticism in the rockpool shrimp P. elegans
    'Public Library of Science (PLoS)', 2020
    Co-Authors: González-castellano Inés, González-ortegón Enrique, Pons Joan, Martínez-lage Andrés
    Abstract:

    The genus Palaemon comprises worldwide marine and freshwater shrimps and prawns, and some of them are ecologically or commercially important species. Palaemon is not currently a monophyletic group, so phylogenetics and systematics are constantly changing. Species crypticism has been pointed out in several Palaemon species, being the clearest evidence in the European rockpool shrimp P. elegans. Here we sequenced and described seven European Palaemon mitochondrial genomes. The mitochondrial protein-coding genes were used, along with those of three other Palaemon species, to perform mitogenome phylogenetic analyses to clarify the evolutionary relationships within the genus, and particularly to shed light on the cryptic species found within P. elegans. The Messinian Salinity Crisis (5.3-5.9 Ma, late Miocene) was proposed to be the origin of this cryptic species and it was used as aged constraint for calibration analysis. We provide the largest and the first time-calibrated mitogenome phylogeny of the genus Palaemon and mitogenome substitution rate was estimated (1.59% per million years) in Decapoda for the first time. Our results highlighted the need for future systematics changes in Palaemon and crypticism in P. elegans was confirmed. Mitochondrial genome and cox1 (1.41%) substitution rate estimates matched those published elsewhere, arguing that the Messinian Salinity Crisis was a plausible event driving the split between P. elegans and its cryptic species. Molecular dating suggested that Pleistocene glaciations were likely involved in the differentiation between the Atlantic and Mediterranean populations of P. elegans. On the contrary, the divergence between the Atlantic and Mediterranean populations of the common littoral shrimp P. serratus was greater and dated to be much older (4.5-12.3 Ma, Plio-Miocene), so we considered that they could represent two separated species. Therefore, species crypticism in the genus Palaemon seems to be a common phenomenon.This work was funded by a CTM2014-53838-R grant from the Spanish Government (Ministerio de Economía y Competitividad) and by a ED431C 2018/S7 grant from Xunta de Galicia (Programa de Investigación Competitiva do Sistema Universitario Galego, Modalidade de grupos de referencia competitiva: Grupo de Investigación en Biología Evolutiva). I. González-Castellano was supported by a FPU scholarship from Ministerio de Educación, Cultura y Deporte (Spain)

  • The Baltic prawn Palaemon adspersus Rathke, 1837 (Decapoda, Caridea, Palaemonidae): first record, possible establishment, and illustrated key of the subfamily Palaemoninae in northwest Atlantic waters
    'Regional Euro-Asian Biological Invasions Centre Oy (REABIC)', 2015
    Co-Authors: González-ortegón Enrique, Sargent Philip, Pohle Gerhard, Martínez-lage Andrés
    Abstract:

    This study documents the introduction of the European Baltic prawn, Palaemon adspersus Rathke, 1837 to the coastal waters of northeastern North America, specifically the west coast of Newfoundland and the Magdalen Islands in the Gulf of St. Lawrence, Canada. Species identification was verified using morphological and genetic criteria. In September 2011, the first specimens of P. adspersus were collected in Gulf of St. Lawrence waters near Stephenville Crossing, Newfoundland, Canada. In 2012, additional P. adspersus specimens were collected in this area and at St. Andrew’s, located further south in western Newfoundland and in 2013 several egg-bearing females were collected further north in York Harbour. Accidental transport by ballast water of ships seems the likely vector for transport of Baltic prawn to the Gulf of St. Lawrence from Northern Europe or the Caspian Sea. It is possible that this shrimp has a wider presence in Atlantic Canadian waters but, due to its close resemblance to native shrimp species, it may have been previously misidentified, as occurred with specimens collected from the Magdalen Islands. We further expect that other species of the genus Palaemon, including P. elegans Rathke, 1837 from the Baltic Sea or northeastern United States, and P. macrodactylus Rathbun, 1902 from the northeastern United States, may invade the Gulf of St. Lawrence. We provide an illustrated key for the identification of these exotic Palaemon species and to differentiate them from native members of the subfamily Palaemoninae.Funding for this project was provided by the Government of Canada’s Department of Fisheries and Oceans and AGL2011-23689 grant from the Spanish government (Ministerio de Economía y Competitividad). Financial support to EGO was provided by a Marie Curie fellowship with European funds.Peer reviewe

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