The Experts below are selected from a list of 7470 Experts worldwide ranked by ideXlab platform
Roland Brandl - One of the best experts on this subject based on the ideXlab platform.
-
impact of habitat fragmentation on genetic population structure of roach rutilus rutilus in a riparian ecosystem
Conservation Genetics, 2004Co-Authors: Bernd Hänfling, Walter Durka, Roland BrandlAbstract:During the last 200 years, the riparianecosystem along major rivers has been reducedto a few scattered remnants. Important elementsof the riparian ecosystem are water bodieswhich were originally connected to the mainriver channel by annual floodings. Due to riverregulations many of these remnants are nowvirtually isolated. In an allozyme analysisusing roach, rutilus rutilus, as a studyspecies we demonstrate that the geneticdiversity (number of alleles per locus,expected heterozygosity) of populations livingwithin floodplain water bodies is not severelyimpoverished compared to the genetic diversitywithin the main river channel. However, wefound slight differences in the allelefrequencies of flood plain water bodies and themain river channel. Nevertheless, fishpopulations in floodplain water bodies mayserve as reservoirs of autochthonous geneticmaterial for restoration of fish populations inthe main river channel after populationextinction due to catastrophic accidents (e.g.industrial pollution).
Arne Linløkken - One of the best experts on this subject based on the ideXlab platform.
-
Environmental effects on size and growth of perch (Perca fluviatilis) and roach (rutilus rutilus)
2008Co-Authors: Arne Linløkken, Trygve HesthagenAbstract:Environmental effects on size and growth of perch (Perca fluviatilis) and roach (rutilus rutilus)
-
Effect of temperature and group size on swimming speed and capture rate of perch (Perca fluviatilis) and roach (rutilus rutilus).
2008Co-Authors: Arne Linløkken, Eva Bergman, Larry GreenbergAbstract:Effect of temperature and group size on swimming speed and capture rate of perch (Perca fluviatilis) and roach (rutilus rutilus).
-
Higher catch per unit effort of perch (Perca fluviatilis) compared to roach (rutilus rutilus) in multimesh gillnets may bias the interpretation of species composition
2007Co-Authors: Arne LinløkkenAbstract:Higher catch per unit effort of perch (Perca fluviatilis) compared to roach (rutilus rutilus) in multimesh gillnets may bias the interpretation of species composition
Bernd Hänfling - One of the best experts on this subject based on the ideXlab platform.
-
impact of habitat fragmentation on genetic population structure of roach rutilus rutilus in a riparian ecosystem
Conservation Genetics, 2004Co-Authors: Bernd Hänfling, Walter Durka, Roland BrandlAbstract:During the last 200 years, the riparianecosystem along major rivers has been reducedto a few scattered remnants. Important elementsof the riparian ecosystem are water bodieswhich were originally connected to the mainriver channel by annual floodings. Due to riverregulations many of these remnants are nowvirtually isolated. In an allozyme analysisusing roach, rutilus rutilus, as a studyspecies we demonstrate that the geneticdiversity (number of alleles per locus,expected heterozygosity) of populations livingwithin floodplain water bodies is not severelyimpoverished compared to the genetic diversitywithin the main river channel. However, wefound slight differences in the allelefrequencies of flood plain water bodies and themain river channel. Nevertheless, fishpopulations in floodplain water bodies mayserve as reservoirs of autochthonous geneticmaterial for restoration of fish populations inthe main river channel after populationextinction due to catastrophic accidents (e.g.industrial pollution).
Yu. G. Izyumov - One of the best experts on this subject based on the ideXlab platform.
-
Delayed consequences of extremely low-frequency magnetic fields and the influence of adverse environmental conditions on roach rutilus rutilus embryos.
Journal of Fish Biology, 2016Co-Authors: V. V. Krylov, Yu. V. Chebotareva, Yu. G. IzyumovAbstract:This study presents data collected over a 6 year period on the effects of extremely low-frequency magnetic fields (MFs) (1.4-1.6 µT, 500 Hz and 1.4-1.6 µT, 72.5 Hz) and MFs in combination with other environmental stressors (elevated temperature, 0.01 mg l(-1) trichlorfon, 0.01 mg l(-1) copper sulphate pentahydrate) on roach rutilus rutilus embryos. Effects were studied during different stages of early development. rutilus rutilus were raised in ponds for 4 months after exposure to MFs. The mass, standard length (LS ) and morphological characteristics of underyearlings which were exposed as embryos were recorded. An increase in embryo mortality and a decrease in LS and mass indices in underyearlings were noted after they had been exposed to a combination of MFs and different adverse environmental factors. In addition, exposure to MFs led to changes in the total number of vertebrae and the number of seismosensory system openings in the mandibular bones of underyearlings. MFs of different frequency caused both increases (500 Hz) and decreases (72.5 Hz) in morphological diversity. The stressors used in this study, however, did not increase the fluctuating asymmetry of bilateral morphological characteristics. The possible microevolutionary effects of exposure to MFs alone and in combination with other adverse environmental factors upon natural fish populations are discussed.
-
Effect of a magnetic field and copper upon activity of hydrolytic enzymes in roach (rutilus rutilus) underyearlings
Journal of Ichthyology, 2013Co-Authors: I. L. Golovanova, Yu. V. Chebotareva, V. V. Krylov, A. A. Filippov, Yu. G. IzyumovAbstract:Remote effects of separate and combined exposure to copper (0.001 mg/L and 0.01 mg/L) and a low-frequency magnetic field during early embryogenesis in roach ( rutilus rutilus ) underyearlings were studied. The study revealed that exposures lead to changes in the linear and weight parameters, activity of glycosidases, and kinetic characteristics of carbohydrates hydrolysis in the fish intestine. Copper decreases the activity of glycosidases and modifies the effect of a magnetic field. The exposure-induced decrease in the value of the seeming Michaelis constant of carbohydrate hydrolysis indicates the increase in the enzyme-substrate affinity. This phenomenon may be attributed to the adaptive reactions in response to negative effects of copper and a magnetic field during early ontogenesis in roach.
-
Selection of direction of movement and bilateral morphological asymmetry in young roach (rutilus rutilus)
Biology Bulletin Reviews, 2012Co-Authors: E. I. Izvekov, V. A. Nepomnyashchikh, E. N. Medyantseva, Yu. V. Chebotareva, Yu. G. IzyumovAbstract:The asymmetry in selecting the direction of movement, i.e., the preference to swim clockwise or counterclockwise, was found in yearling roaches rutilus rutilus (Cyprinidae) placed into a ring-shaped tank under infrared light. A positive correlation was revealed between the behavioral laterality and asymmetry of the surface area of paired frontal bones. Possible causal factors responsible for the correlation between these behavioral and morphological asymmetries are discussed.
-
Effects of an induced magnetic storm on the early ontogenesis of roach rutilus rutilus (L.)
Inland Water Biology, 2010Co-Authors: V. V. Krylov, Yu. V. Chebotareva, Yu. G. Izyumov, O. D. Zotov, Elena A. OsipovaAbstract:The influence that an induced magnetic storm (IMS) modeled in a confined volume has on the early ontogenesis of rutilus rutilus was studied. The significant effects of the IMS were observed for the hatching rate of roach embryos, the size-weight and morphometric parameters of the fry, the variability of the vertebral column, and ontogeny stability in the roach offspring.
-
The effect of an alternating electromagnetic field upon early development in roach (rutilus rutilus: Cyprinidae, cypriniformes)
Journal of Ichthyology, 2009Co-Authors: Yu. V. Chebotareva, Yu. G. Izyumov, V. V. KrylovAbstract:The effect of an alternating electromagnetic field (EMF) upon three stages of roach’s (rutilus rutilus) early development was studied. The studies covered the periods before gastrulation; from gastrulation until hatching; and from hatching until yolk sac resorption. It has been shown that the EMF effect is as stronger as earlier in the embryogenesis the roach was subjected to an impact. The following responses to EMF were registered: earlier hatching of prelarvae, increase in the morphological diversity of juvenile fish, decrease in body lengths and weights, and changes in the number of vertebrae in yearlings.
Yu. V. Chebotareva - One of the best experts on this subject based on the ideXlab platform.
-
exploratory behavior of juvenile roach rutilus rutilus l teleostei cyprinidae in a maze after different magnetic impacts on embryos
Inland Water Biology, 2016Co-Authors: Elena A. Osipova, V. A. Nepomnyashchikh, V. V. Krylov, Yu. V. ChebotarevaAbstract:We have investigated a sequence of visits to arms in a cross maze in juvenile (1-year-old) roach rutilus rutilus (L.). Fish embryos of one group are raised under a natural geomagnetic field. The embryos of another group are exposed to the main phase of a simulated geomagnetic storm (changes in geomagnetic field up to 100 nT for each component). It turns out that the sequence of visits does not differ from random in both groups. Thus, the exploratory behavior in juvenile roach differs from other animal taxa investigated earlier. In the latter taxa a spontaneous alternation was observed: a tendency to visit the arm which was visited least recently.
-
Delayed consequences of extremely low-frequency magnetic fields and the influence of adverse environmental conditions on roach rutilus rutilus embryos.
Journal of Fish Biology, 2016Co-Authors: V. V. Krylov, Yu. V. Chebotareva, Yu. G. IzyumovAbstract:This study presents data collected over a 6 year period on the effects of extremely low-frequency magnetic fields (MFs) (1.4-1.6 µT, 500 Hz and 1.4-1.6 µT, 72.5 Hz) and MFs in combination with other environmental stressors (elevated temperature, 0.01 mg l(-1) trichlorfon, 0.01 mg l(-1) copper sulphate pentahydrate) on roach rutilus rutilus embryos. Effects were studied during different stages of early development. rutilus rutilus were raised in ponds for 4 months after exposure to MFs. The mass, standard length (LS ) and morphological characteristics of underyearlings which were exposed as embryos were recorded. An increase in embryo mortality and a decrease in LS and mass indices in underyearlings were noted after they had been exposed to a combination of MFs and different adverse environmental factors. In addition, exposure to MFs led to changes in the total number of vertebrae and the number of seismosensory system openings in the mandibular bones of underyearlings. MFs of different frequency caused both increases (500 Hz) and decreases (72.5 Hz) in morphological diversity. The stressors used in this study, however, did not increase the fluctuating asymmetry of bilateral morphological characteristics. The possible microevolutionary effects of exposure to MFs alone and in combination with other adverse environmental factors upon natural fish populations are discussed.
-
Effect of a magnetic field and copper upon activity of hydrolytic enzymes in roach (rutilus rutilus) underyearlings
Journal of Ichthyology, 2013Co-Authors: I. L. Golovanova, Yu. V. Chebotareva, V. V. Krylov, A. A. Filippov, Yu. G. IzyumovAbstract:Remote effects of separate and combined exposure to copper (0.001 mg/L and 0.01 mg/L) and a low-frequency magnetic field during early embryogenesis in roach ( rutilus rutilus ) underyearlings were studied. The study revealed that exposures lead to changes in the linear and weight parameters, activity of glycosidases, and kinetic characteristics of carbohydrates hydrolysis in the fish intestine. Copper decreases the activity of glycosidases and modifies the effect of a magnetic field. The exposure-induced decrease in the value of the seeming Michaelis constant of carbohydrate hydrolysis indicates the increase in the enzyme-substrate affinity. This phenomenon may be attributed to the adaptive reactions in response to negative effects of copper and a magnetic field during early ontogenesis in roach.
-
Selection of direction of movement and bilateral morphological asymmetry in young roach (rutilus rutilus)
Biology Bulletin Reviews, 2012Co-Authors: E. I. Izvekov, V. A. Nepomnyashchikh, E. N. Medyantseva, Yu. V. Chebotareva, Yu. G. IzyumovAbstract:The asymmetry in selecting the direction of movement, i.e., the preference to swim clockwise or counterclockwise, was found in yearling roaches rutilus rutilus (Cyprinidae) placed into a ring-shaped tank under infrared light. A positive correlation was revealed between the behavioral laterality and asymmetry of the surface area of paired frontal bones. Possible causal factors responsible for the correlation between these behavioral and morphological asymmetries are discussed.
-
Effects of an induced magnetic storm on the early ontogenesis of roach rutilus rutilus (L.)
Inland Water Biology, 2010Co-Authors: V. V. Krylov, Yu. V. Chebotareva, Yu. G. Izyumov, O. D. Zotov, Elena A. OsipovaAbstract:The influence that an induced magnetic storm (IMS) modeled in a confined volume has on the early ontogenesis of rutilus rutilus was studied. The significant effects of the IMS were observed for the hatching rate of roach embryos, the size-weight and morphometric parameters of the fry, the variability of the vertebral column, and ontogeny stability in the roach offspring.
