The Experts below are selected from a list of 8454 Experts worldwide ranked by ideXlab platform
Alf Norkko - One of the best experts on this subject based on the ideXlab platform.
-
juvenile Flatfish in the northern baltic sea long term decline and potential links to habitat characteristics
Journal of Sea Research, 2016Co-Authors: Henri Jokinen, Hakan Wennhage, Victoria Ollus, Alf NorkkoAbstract:Abstract Flatfish in the northern Baltic Sea are facing multiple environmental pressures due to on-going large-scale ecosystem changes linked to eutrophication and climate change. Shallow juvenile habitats of Flatfishes are expected to be especially susceptible to these environmental pressures. Using previously unpublished historical and present-state data on juvenile Flatfish in nursery areas along the Finnish coast we demonstrate a drastic (up to 40 ×) decline in 1-Y-O flounder densities since the 1980s and a particularly low current occurrence of both flounders and turbots in several known juvenile habitats. As a consequence of ongoing coastal eutrophication vegetation coverage and filamentous algae have generally increased in shallow areas. We examined the predicted negative effect of vegetation/algae by exploring quantitative relationships between juvenile Flatfish (flounder and turbot) occurrence and vegetation/algae among other environmental factors in shallow juvenile habitats. Despite sparse occurrence of juveniles we found a significant negative relationship between Flatfish abundance and vegetation cover, implicating eutrophication as a potential major driver affecting the value of juvenile habitat. Shallow littoral habitats play a particularly central role for Flatfish due to the spatial concentration of fish in these areas during the critical juvenile stage. Despite their importance, these areas have been relatively poorly studied in the northern Baltic Sea, which makes it difficult to quantify overall changes in environmental conditions and to relate these changes to Flatfish recruitment. The low present-state Flatfish densities recorded preclude strong inferences of the role of habitat quality to be drawn. Our study does, however, provide a baseline for future assessment. Based on existing evidence, we cannot thus establish any bottlenecks but hypothesize that the current low occurrence of juvenile Flatfish, and the population decline of flounder on the Finnish coast, might have resulted from a combination of altered larval supply and reduced nursery value.
-
Juvenile Flatfish in the northern Baltic Sea — long-term decline and potential links to habitat characteristics
Journal of Sea Research, 2015Co-Authors: Henri Jokinen, Hakan Wennhage, Victoria Ollus, Alf NorkkoAbstract:Abstract Flatfish in the northern Baltic Sea are facing multiple environmental pressures due to on-going large-scale ecosystem changes linked to eutrophication and climate change. Shallow juvenile habitats of Flatfishes are expected to be especially susceptible to these environmental pressures. Using previously unpublished historical and present-state data on juvenile Flatfish in nursery areas along the Finnish coast we demonstrate a drastic (up to 40 ×) decline in 1-Y-O flounder densities since the 1980s and a particularly low current occurrence of both flounders and turbots in several known juvenile habitats. As a consequence of ongoing coastal eutrophication vegetation coverage and filamentous algae have generally increased in shallow areas. We examined the predicted negative effect of vegetation/algae by exploring quantitative relationships between juvenile Flatfish (flounder and turbot) occurrence and vegetation/algae among other environmental factors in shallow juvenile habitats. Despite sparse occurrence of juveniles we found a significant negative relationship between Flatfish abundance and vegetation cover, implicating eutrophication as a potential major driver affecting the value of juvenile habitat. Shallow littoral habitats play a particularly central role for Flatfish due to the spatial concentration of fish in these areas during the critical juvenile stage. Despite their importance, these areas have been relatively poorly studied in the northern Baltic Sea, which makes it difficult to quantify overall changes in environmental conditions and to relate these changes to Flatfish recruitment. The low present-state Flatfish densities recorded preclude strong inferences of the role of habitat quality to be drawn. Our study does, however, provide a baseline for future assessment. Based on existing evidence, we cannot thus establish any bottlenecks but hypothesize that the current low occurrence of juvenile Flatfish, and the population decline of flounder on the Finnish coast, might have resulted from a combination of altered larval supply and reduced nursery value.
Claudia Aragao - One of the best experts on this subject based on the ideXlab platform.
-
cloning tissue and ontogenetic expression of the taurine transporter in the Flatfish senegalese sole solea senegalensis
Amino Acids, 2012Co-Authors: Wilson Pinto, Ivar Ronnestad, Annelise Olderbakk Jordal, Ana S Gomes, Maria Teresa Dinis, Claudia AragaoAbstract:Flatfish species seem to require dietary taurine for normal growth and development. Although dietary taurine supplementation has been recommended for Flatfish, little is known about the mechanisms of taurine absorption in the digestive tract of Flatfish throughout ontogeny. This study described the cloning and ontogenetic expression of the taurine transporter (TauT) in the Flatfish Senegalese sole (Solea senegalensis). Results showed a high similarity between TauT in Senegalese sole and other vertebrates, but a change in TauT amino acid sequences indicates that taurine transport may differ between mammals and fish, reptiles or birds. Moreover, results showed that Senegalese sole metamorphosis is an important developmental trigger to promote taurine transport in larvae, especially in muscle tissues, which may be important for larval growth. Results also indicated that the capacity to uptake dietary taurine in the digestive tract is already established in larvae at the onset of metamorphosis. In Senegalese sole juveniles, TauT expression was highest in brain, heart and eye. These are organs where taurine is usually found in high concentrations and is believed to play important biological roles. In the digestive tract of juveniles, TauT was more expressed in stomach and hindgut, indicating that dietary taurine is quickly absorbed when digestion begins and taurine endogenously used for bile salt conjugation may be recycled at the posterior end of the digestive tract. Therefore, these results suggest an enterohepatic recycling pathway for taurine in Senegalese sole, a process that may be important for maintenance of the taurine body levels in Flatfish species.
Roberto Herrán - One of the best experts on this subject based on the ideXlab platform.
-
First Haploid Genetic Map Based on Microsatellite Markers in Senegalese Sole (Solea senegalensis, Kaup 1858)
Marine Biotechnology, 2015Co-Authors: Ma. Jesús Molina-luzón, Miguel Hermida, Rafael Navajas-pérez, Francisca Robles, José Ignacio Navas, Carmelo Ruiz-rejón, Carmen Bouza, Paulino Martínez, Roberto HerránAbstract:The Senegalese sole ( Solea senegalensis , Kaup 1858) is a Flatfish species of great value for aquaculture. In this study, we develop the first linkage map in this species based on microsatellite markers characterized from genomic DNA libraries and EST databases of Senegalese sole and from other Flatfish species. Three reference gynogenetic families were obtained by chromosome-manipulation techniques: two haploid gynogenetics, used to assign and order microsatellites to linkage groups and another diploid gynogenetic family, used for estimating marker–centromere distances. The consensus map consists of 129 microsatellites distributed in 27 linkage groups (LG), with an average density of 4.7 markers per LG and comprising 1,004 centimorgans (cM). Additionally, 15 markers remained unlinked. Through half-tetrad analysis, we were able to estimate the centromere distance for 81 markers belonging to 24 LG, representing an average of 3 markers per LG. Comparative mapping was performed between Flatfish species LG and model fish species chromosomes (stickleback, Tetraodon, medaka, fugu and zebrafish). The usefulness of microsatellite markers and the genetic map as tools for comparative mapping and evolution studies is discussed.
Wilson Pinto - One of the best experts on this subject based on the ideXlab platform.
-
cloning tissue and ontogenetic expression of the taurine transporter in the Flatfish senegalese sole solea senegalensis
Amino Acids, 2012Co-Authors: Wilson Pinto, Ivar Ronnestad, Annelise Olderbakk Jordal, Ana S Gomes, Maria Teresa Dinis, Claudia AragaoAbstract:Flatfish species seem to require dietary taurine for normal growth and development. Although dietary taurine supplementation has been recommended for Flatfish, little is known about the mechanisms of taurine absorption in the digestive tract of Flatfish throughout ontogeny. This study described the cloning and ontogenetic expression of the taurine transporter (TauT) in the Flatfish Senegalese sole (Solea senegalensis). Results showed a high similarity between TauT in Senegalese sole and other vertebrates, but a change in TauT amino acid sequences indicates that taurine transport may differ between mammals and fish, reptiles or birds. Moreover, results showed that Senegalese sole metamorphosis is an important developmental trigger to promote taurine transport in larvae, especially in muscle tissues, which may be important for larval growth. Results also indicated that the capacity to uptake dietary taurine in the digestive tract is already established in larvae at the onset of metamorphosis. In Senegalese sole juveniles, TauT expression was highest in brain, heart and eye. These are organs where taurine is usually found in high concentrations and is believed to play important biological roles. In the digestive tract of juveniles, TauT was more expressed in stomach and hindgut, indicating that dietary taurine is quickly absorbed when digestion begins and taurine endogenously used for bile salt conjugation may be recycled at the posterior end of the digestive tract. Therefore, these results suggest an enterohepatic recycling pathway for taurine in Senegalese sole, a process that may be important for maintenance of the taurine body levels in Flatfish species.
Ma. Jesús Molina-luzón - One of the best experts on this subject based on the ideXlab platform.
-
First Haploid Genetic Map Based on Microsatellite Markers in Senegalese Sole (Solea senegalensis, Kaup 1858)
Marine Biotechnology, 2015Co-Authors: Ma. Jesús Molina-luzón, Miguel Hermida, Rafael Navajas-pérez, Francisca Robles, José Ignacio Navas, Carmelo Ruiz-rejón, Carmen Bouza, Paulino Martínez, Roberto HerránAbstract:The Senegalese sole ( Solea senegalensis , Kaup 1858) is a Flatfish species of great value for aquaculture. In this study, we develop the first linkage map in this species based on microsatellite markers characterized from genomic DNA libraries and EST databases of Senegalese sole and from other Flatfish species. Three reference gynogenetic families were obtained by chromosome-manipulation techniques: two haploid gynogenetics, used to assign and order microsatellites to linkage groups and another diploid gynogenetic family, used for estimating marker–centromere distances. The consensus map consists of 129 microsatellites distributed in 27 linkage groups (LG), with an average density of 4.7 markers per LG and comprising 1,004 centimorgans (cM). Additionally, 15 markers remained unlinked. Through half-tetrad analysis, we were able to estimate the centromere distance for 81 markers belonging to 24 LG, representing an average of 3 markers per LG. Comparative mapping was performed between Flatfish species LG and model fish species chromosomes (stickleback, Tetraodon, medaka, fugu and zebrafish). The usefulness of microsatellite markers and the genetic map as tools for comparative mapping and evolution studies is discussed.