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Ian A. E. Butts - One of the best experts on this subject based on the ideXlab platform.
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Salinity reduction benefits European eel larvae: Insights at the morphological and molecular level
PLoS ONE, 2018Co-Authors: Sebastian N. Politis, David Mazurais, Arianna Servili, Jose-luis Zambonino-infante, Joanna J. Miest, Jonna Tomkiewicz, Ian A. E. ButtsAbstract:European eel (Anguilla anguilla) is a Euryhaline Species, that has adapted to cope with both, hyper- and hypo-osmotic environments. This study investigates the effect of salinity, from a morphological and molecular point of view on European eel larvae reared from 0 to 12 days post hatch (dph). Offspring reared in 36 practical salinity units (psu; control), were compared with larvae reared in six scenarios, where salinity was decreased on 0 or 3 dph and in rates of 1, 2 or 4 psu/day, towards iso-osmotic conditions. Results showed that several genes relating to osmoregulation (nkcc2 alpha, nkcc2 beta, aqp1dup, aqpe), stress response (hsp70, hsp90), and thyroid metabolism (thr alpha A, thr alpha B, thr beta B, diol, dio2, dio3) were differentially expressed throughout larval development, while nkcc1 alpha, nkcc2 beta, aqp3, aqp 1dup, aqpe, hsp90, thr alpha A and dio3 showed lower expression in response to the salinity reduction. Moreover, larvae were able to keep energy metabolism related gene expression (atp6, cox1) at stable levels, irrespective of the salinity reduction. As such, when reducing salinity, an energy surplus associated to reduced osmoregulation demands and stress (lower nkcc, aqp and hsp expression), likely facilitated the observed increased survival, improved biometry and enhanced growth efficiency. Additionally, the salinity reduction decreased the amount of severe deformities such as spinal curvature and emaciation but also induced an edematous state of the larval heart, resulting in the most balanced mortality/deformity ratio when salinity was decreased on 3 dph and at 2 psu/day. However, the persistency of the pericardial edema and if or how it represents an obstacle in further larval development needs to be further clarified. In conclusion, this study clearly showed that salinity reduction regimes towards iso-osmotic conditions facilitated the European eel pre-leptocephalus development and revealed the existence of highly sensitive and regulated osmoregulation processes at such early life stage of this Species.
Geoffrey Allan Boxshall - One of the best experts on this subject based on the ideXlab platform.
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global diversity of cumaceans tanaidaceans crustacea cumacea tanaidacea in freshwater
Hydrobiologia, 2008Co-Authors: Damia Jaume, Geoffrey Allan BoxshallAbstract:Cumacea and Tanaidacea are marginal groups in continental waters. Although many Euryhaline Species from both groups are found in estuaries and coastal lagoons, most occur only temporarily in non-marine habitats, appearing unable to form stable populations there. A total of 21 genuinely non-marine cumaceans are known, mostly concentrated in the Ponto-Caspian region, and only four tanaids have been reported from non-marine environments. Most non-marine cumaceans (19 Species) belong in the Pseudocumatidae and appear restricted to the Caspian Sea (with salinity up to 13%) and its peripheral fluvial basins, including the northern, lower salinity zones of the Black Sea (Sea of Azov). There are nine Ponto-Caspian genera, all endemic to the region. Only two other taxa (in the family Nannastacidae) occur in areas free of any marine-water influence, in river basins in North and South America. Both seem able to survive in waters of raised salinity of the lower reaches of these fluvial systems; but neither has been recorded in full salinity marine environments. The only non-marine tanaidacean thus far known lives in a slightly brackish inland spring in Northern Australia. The genus includes a second Species, from a brackish-water lake at the Bismarck Archipelago, tentatively included here as non-marine also. Two additional Species of tanaidaceans have been reported from non-marine habitats but both also occur in the sea.
Sebastian N. Politis - One of the best experts on this subject based on the ideXlab platform.
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Salinity reduction benefits European eel larvae: Insights at the morphological and molecular level
PLoS ONE, 2018Co-Authors: Sebastian N. Politis, David Mazurais, Arianna Servili, Jose-luis Zambonino-infante, Joanna J. Miest, Jonna Tomkiewicz, Ian A. E. ButtsAbstract:European eel (Anguilla anguilla) is a Euryhaline Species, that has adapted to cope with both, hyper- and hypo-osmotic environments. This study investigates the effect of salinity, from a morphological and molecular point of view on European eel larvae reared from 0 to 12 days post hatch (dph). Offspring reared in 36 practical salinity units (psu; control), were compared with larvae reared in six scenarios, where salinity was decreased on 0 or 3 dph and in rates of 1, 2 or 4 psu/day, towards iso-osmotic conditions. Results showed that several genes relating to osmoregulation (nkcc2 alpha, nkcc2 beta, aqp1dup, aqpe), stress response (hsp70, hsp90), and thyroid metabolism (thr alpha A, thr alpha B, thr beta B, diol, dio2, dio3) were differentially expressed throughout larval development, while nkcc1 alpha, nkcc2 beta, aqp3, aqp 1dup, aqpe, hsp90, thr alpha A and dio3 showed lower expression in response to the salinity reduction. Moreover, larvae were able to keep energy metabolism related gene expression (atp6, cox1) at stable levels, irrespective of the salinity reduction. As such, when reducing salinity, an energy surplus associated to reduced osmoregulation demands and stress (lower nkcc, aqp and hsp expression), likely facilitated the observed increased survival, improved biometry and enhanced growth efficiency. Additionally, the salinity reduction decreased the amount of severe deformities such as spinal curvature and emaciation but also induced an edematous state of the larval heart, resulting in the most balanced mortality/deformity ratio when salinity was decreased on 3 dph and at 2 psu/day. However, the persistency of the pericardial edema and if or how it represents an obstacle in further larval development needs to be further clarified. In conclusion, this study clearly showed that salinity reduction regimes towards iso-osmotic conditions facilitated the European eel pre-leptocephalus development and revealed the existence of highly sensitive and regulated osmoregulation processes at such early life stage of this Species.
Mario H. Londoño-mesa - One of the best experts on this subject based on the ideXlab platform.
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Colombian Caribbean, South America Catalina Arteaga-Flórez1, Vanessa Fernández-Rodríguez1,
2016Co-Authors: Mario H. Londoño-mesaAbstract:The genus Ficopomatus (Serpulidae) consists of sessile, tubicolous polychaete annelid worms that may colonize a diversity of substrata, and tolerate considerable variations in salinity. Thus, members of this genus, including Ficopomatus uschakovi, in some cases are exotic and maybe invasive. The purpose of our research was to collect and identify marine organisms associated with the submerged roots of mangrove trees in the Gulf of Urabá, Colombian Caribbean, South America. Within the Gulf, there is a well-developed forest of the Red Mangrove, Rhizophora mangle, along the margins of El Uno Bay. We sampled the roots of R. mangle from five stations of the bay, and we identified specimens of F. uschakovi from each of those stations. Ficopomatus uschakovi was found to be more abundant in regions of the bay that exhibit the lowest salinity. Based on a morphological comparison of the present specimens with the original spe-cies description, revised descriptions, and other records from the Indo-West Pacific, Mexican Pacific, and Venezuelan and Brazilian Caribbean, we suggest that F. uschakovi has a broader geographical distribution. Furthermore, because of this broad distribution, and the observed tolerance for low salinity in our study, we also suggest that F. uschakovi is a Euryhaline Species. It is also likely that F. uschakovi will be found in other localities in the Gulf of Urabá, and in other regions of the Colombian Caribbean. Thus, this recor
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First record of the polychaete Ficopomatus uschakovi (Pillai, 1960) (Annelida, Serpulidae) in the Colombian Caribbean, South America
Pensoft Publishers, 2014Co-Authors: Catalina Arteaga-florez, Vanessa Fernandez-rodriguez, Mario H. Londoño-mesaAbstract:The genus Ficopomatus (Serpulidae) consists of sessile, tubicolous polychaete annelid worms that may colonize a diversity of substrata, and tolerate considerable variations in salinity. Thus, members of this genus, including Ficopomatus uschakovi, in some cases are exotic and maybe invasive. The purpose of our research was to collect and identify marine organisms associated with the submerged roots of mangrove trees in the Gulf of Urabá, Colombian Caribbean, South America. Within the Gulf, there is a well-developed forest of the Red Mangrove, Rhizophora mangle, along the margins of El Uno Bay. We sampled the roots of R. mangle from five stations of the bay, and we identified specimens of F. uschakovi from each of those stations. Ficopomatus uschakovi was found to be more abundant in regions of the bay that exhibit the lowest salinity. Based on a morphological comparison of the present specimens with the original Species description, revised descriptions, and other records from the Indo-West Pacific, Mexican Pacific, and Venezuelan and Brazilian Caribbean, we suggest that F. uschakovi has a broader geographical distribution. Furthermore, because of this broad distribution, and the observed tolerance for low salinity in our study, we also suggest that F. uschakovi is a Euryhaline Species. It is also likely that F. uschakovi will be found in other localities in the Gulf of Urabá, and in other regions of the Colombian Caribbean. Thus, this record extends the distribution of the Species to the Colombian Caribbean, giving the Species a continuous distribution across the northern coast of South America
Damia Jaume - One of the best experts on this subject based on the ideXlab platform.
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global diversity of cumaceans tanaidaceans crustacea cumacea tanaidacea in freshwater
Hydrobiologia, 2008Co-Authors: Damia Jaume, Geoffrey Allan BoxshallAbstract:Cumacea and Tanaidacea are marginal groups in continental waters. Although many Euryhaline Species from both groups are found in estuaries and coastal lagoons, most occur only temporarily in non-marine habitats, appearing unable to form stable populations there. A total of 21 genuinely non-marine cumaceans are known, mostly concentrated in the Ponto-Caspian region, and only four tanaids have been reported from non-marine environments. Most non-marine cumaceans (19 Species) belong in the Pseudocumatidae and appear restricted to the Caspian Sea (with salinity up to 13%) and its peripheral fluvial basins, including the northern, lower salinity zones of the Black Sea (Sea of Azov). There are nine Ponto-Caspian genera, all endemic to the region. Only two other taxa (in the family Nannastacidae) occur in areas free of any marine-water influence, in river basins in North and South America. Both seem able to survive in waters of raised salinity of the lower reaches of these fluvial systems; but neither has been recorded in full salinity marine environments. The only non-marine tanaidacean thus far known lives in a slightly brackish inland spring in Northern Australia. The genus includes a second Species, from a brackish-water lake at the Bismarck Archipelago, tentatively included here as non-marine also. Two additional Species of tanaidaceans have been reported from non-marine habitats but both also occur in the sea.
