The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
Jan Kubečka - One of the best experts on this subject based on the ideXlab platform.
-
Deep spawning of perch ( Perca fluviatilis , L.) in the newly created Chabařovice Lake, Czech Republic
Hydrobiologia, 2010Co-Authors: Martin Čech, Jiří Peterka, Milan Říha, Vladislav Draštík, Michal Kratochvíl, Jan KubečkaAbstract:The egg strands of perch were found at up to a depth of 20.2 m and, on average, 88% of perch spawning activity occurred at depths greater than 3 m. Almost all the egg strands were deposited on Dead Vegetation. Ignoring deeper strata may cause drastic underestimation of perch spawning success in lakes.
-
Distribution of egg strands of perch (Perca fluviatilis L.) with respect to depth and spawning substrate
Hydrobiologia, 2009Co-Authors: Martin Čech, Jiří Peterka, Milan Říha, Jan KubečkaAbstract:The distribution of egg strands of perch Perca fluviatilis was studied in relation to water depth and spawning substrate during late April and early May 2007 in Chabařovice Lake, Czech Republic, using SCUBA divers and parallel transects. The depth distribution of egg strands differed significantly between the two sampling dates, being much deeper in early May compared to late April. Perch used at least seven different spawning substrates of which the most important were curly pondweed Potamogeton crispus , worm weed Artemisia sp. and common reed Phragmites communis . However, while living submerged Vegetation, although more abundant, was generally avoided, Dead submerged Vegetation was strongly preferred. It appears that Dead Vegetation is an ideal spawning substrate for perch since placement of the egg strands over those hard, complex three-dimensional structures ensures that the eggs remain well oxygenated 24 hours a day. Factors with significant influence on the distribution of egg strands were as follows (in order of decreasing influence): depth of deposition, type of spawning substrate, date of spawning and temperature at the depth of deposition.
-
Distribution of egg strands of perch (Perca fluviatilis L.) with respect to depth and spawning substrate
Hydrobiologia, 2009Co-Authors: Martin Čech, Jiří Peterka, Milan Říha, Tomáš Jůza, Jan KubečkaAbstract:The distribution of egg strands of perch Perca fluviatilis was studied in relation to water depth and spawning substrate during late April and early May 2007 in Chabařovice Lake, Czech Republic, using SCUBA divers and parallel transects. The depth distribution of egg strands differed significantly between the two sampling dates, being much deeper in early May compared to late April. Perch used at least seven different spawning substrates of which the most important were curly pondweed Potamogeton crispus, worm weed Artemisia sp. and common reed Phragmites communis. However, while living submerged Vegetation, although more abundant, was generally avoided, Dead submerged Vegetation was strongly preferred. It appears that Dead Vegetation is an ideal spawning substrate for perch since placement of the egg strands over those hard, complex three-dimensional structures ensures that the eggs remain well oxygenated 24 hours a day. Factors with significant influence on the distribution of egg strands were as follows (in order of decreasing influence): depth of deposition, type of spawning substrate, date of spawning and temperature at the depth of deposition.
Jiří Peterka - One of the best experts on this subject based on the ideXlab platform.
-
Deep spawning of perch ( Perca fluviatilis , L.) in the newly created Chabařovice Lake, Czech Republic
Hydrobiologia, 2010Co-Authors: Martin Čech, Jiří Peterka, Milan Říha, Vladislav Draštík, Michal Kratochvíl, Jan KubečkaAbstract:The egg strands of perch were found at up to a depth of 20.2 m and, on average, 88% of perch spawning activity occurred at depths greater than 3 m. Almost all the egg strands were deposited on Dead Vegetation. Ignoring deeper strata may cause drastic underestimation of perch spawning success in lakes.
-
Distribution of egg strands of perch (Perca fluviatilis L.) with respect to depth and spawning substrate
Hydrobiologia, 2009Co-Authors: Martin Čech, Jiří Peterka, Milan Říha, Jan KubečkaAbstract:The distribution of egg strands of perch Perca fluviatilis was studied in relation to water depth and spawning substrate during late April and early May 2007 in Chabařovice Lake, Czech Republic, using SCUBA divers and parallel transects. The depth distribution of egg strands differed significantly between the two sampling dates, being much deeper in early May compared to late April. Perch used at least seven different spawning substrates of which the most important were curly pondweed Potamogeton crispus , worm weed Artemisia sp. and common reed Phragmites communis . However, while living submerged Vegetation, although more abundant, was generally avoided, Dead submerged Vegetation was strongly preferred. It appears that Dead Vegetation is an ideal spawning substrate for perch since placement of the egg strands over those hard, complex three-dimensional structures ensures that the eggs remain well oxygenated 24 hours a day. Factors with significant influence on the distribution of egg strands were as follows (in order of decreasing influence): depth of deposition, type of spawning substrate, date of spawning and temperature at the depth of deposition.
-
Distribution of egg strands of perch (Perca fluviatilis L.) with respect to depth and spawning substrate
Hydrobiologia, 2009Co-Authors: Martin Čech, Jiří Peterka, Milan Říha, Tomáš Jůza, Jan KubečkaAbstract:The distribution of egg strands of perch Perca fluviatilis was studied in relation to water depth and spawning substrate during late April and early May 2007 in Chabařovice Lake, Czech Republic, using SCUBA divers and parallel transects. The depth distribution of egg strands differed significantly between the two sampling dates, being much deeper in early May compared to late April. Perch used at least seven different spawning substrates of which the most important were curly pondweed Potamogeton crispus, worm weed Artemisia sp. and common reed Phragmites communis. However, while living submerged Vegetation, although more abundant, was generally avoided, Dead submerged Vegetation was strongly preferred. It appears that Dead Vegetation is an ideal spawning substrate for perch since placement of the egg strands over those hard, complex three-dimensional structures ensures that the eggs remain well oxygenated 24 hours a day. Factors with significant influence on the distribution of egg strands were as follows (in order of decreasing influence): depth of deposition, type of spawning substrate, date of spawning and temperature at the depth of deposition.
Martin Čech - One of the best experts on this subject based on the ideXlab platform.
-
Deep spawning of perch ( Perca fluviatilis , L.) in the newly created Chabařovice Lake, Czech Republic
Hydrobiologia, 2010Co-Authors: Martin Čech, Jiří Peterka, Milan Říha, Vladislav Draštík, Michal Kratochvíl, Jan KubečkaAbstract:The egg strands of perch were found at up to a depth of 20.2 m and, on average, 88% of perch spawning activity occurred at depths greater than 3 m. Almost all the egg strands were deposited on Dead Vegetation. Ignoring deeper strata may cause drastic underestimation of perch spawning success in lakes.
-
Distribution of egg strands of perch (Perca fluviatilis L.) with respect to depth and spawning substrate
Hydrobiologia, 2009Co-Authors: Martin Čech, Jiří Peterka, Milan Říha, Tomáš Jůza, Jan KubečkaAbstract:The distribution of egg strands of perch Perca fluviatilis was studied in relation to water depth and spawning substrate during late April and early May 2007 in Chabařovice Lake, Czech Republic, using SCUBA divers and parallel transects. The depth distribution of egg strands differed significantly between the two sampling dates, being much deeper in early May compared to late April. Perch used at least seven different spawning substrates of which the most important were curly pondweed Potamogeton crispus, worm weed Artemisia sp. and common reed Phragmites communis. However, while living submerged Vegetation, although more abundant, was generally avoided, Dead submerged Vegetation was strongly preferred. It appears that Dead Vegetation is an ideal spawning substrate for perch since placement of the egg strands over those hard, complex three-dimensional structures ensures that the eggs remain well oxygenated 24 hours a day. Factors with significant influence on the distribution of egg strands were as follows (in order of decreasing influence): depth of deposition, type of spawning substrate, date of spawning and temperature at the depth of deposition.
Milan Říha - One of the best experts on this subject based on the ideXlab platform.
-
Deep spawning of perch ( Perca fluviatilis , L.) in the newly created Chabařovice Lake, Czech Republic
Hydrobiologia, 2010Co-Authors: Martin Čech, Jiří Peterka, Milan Říha, Vladislav Draštík, Michal Kratochvíl, Jan KubečkaAbstract:The egg strands of perch were found at up to a depth of 20.2 m and, on average, 88% of perch spawning activity occurred at depths greater than 3 m. Almost all the egg strands were deposited on Dead Vegetation. Ignoring deeper strata may cause drastic underestimation of perch spawning success in lakes.
-
Distribution of egg strands of perch (Perca fluviatilis L.) with respect to depth and spawning substrate
Hydrobiologia, 2009Co-Authors: Martin Čech, Jiří Peterka, Milan Říha, Tomáš Jůza, Jan KubečkaAbstract:The distribution of egg strands of perch Perca fluviatilis was studied in relation to water depth and spawning substrate during late April and early May 2007 in Chabařovice Lake, Czech Republic, using SCUBA divers and parallel transects. The depth distribution of egg strands differed significantly between the two sampling dates, being much deeper in early May compared to late April. Perch used at least seven different spawning substrates of which the most important were curly pondweed Potamogeton crispus, worm weed Artemisia sp. and common reed Phragmites communis. However, while living submerged Vegetation, although more abundant, was generally avoided, Dead submerged Vegetation was strongly preferred. It appears that Dead Vegetation is an ideal spawning substrate for perch since placement of the egg strands over those hard, complex three-dimensional structures ensures that the eggs remain well oxygenated 24 hours a day. Factors with significant influence on the distribution of egg strands were as follows (in order of decreasing influence): depth of deposition, type of spawning substrate, date of spawning and temperature at the depth of deposition.
Birgitte Andersen - One of the best experts on this subject based on the ideXlab platform.
-
Screening for cellulose and hemicellulose degrading enzymes from the fungal genus Ulocladium
International Biodeterioration & Biodegradation, 2009Co-Authors: Mads Mølgaard Pedersen, Morten Hollensted, Lene Lange, Birgitte AndersenAbstract:The fungal genus Ulocladium consists mostly of saprotrophic species and can readily be isolated from Dead Vegetation, rotten wood, paper, textiles and other cellulose containing materials. Thus, they must produce cellulolytic and hemicellulolytic enzymes. In this study fifty Ulocladium strains from ten different species were tested for enzyme activities on 14 different azurine-cross-linked (AZCL) substrates and analyzed by multivariate analysis. The tested strains of Ulocladium were found to produce a broad enzyme profile. Most species in Ulocladium were able to produced high amounts of enzymes that degraded amylose, arabinoxylan, β-glucan, cellulose and xylan; however, variations between species as well as between individual strains in each species were seen. Overall, the enzyme profiles were found to be species specific, but also source of isolation impacted the enzymes produced. The results suggest that species identity as well as isolation source must be considered when screening microorganisms for enzymes.
-
Metabolite production by different Ulocladium species.
International Journal of Food Microbiology, 2008Co-Authors: Birgitte Andersen, Morten HollenstedAbstract:Ulocladium, which is phylogenetically related to Alternaria, contains species that are food spoilers and plant pathogens, but also species that have potential as enzyme producers and bio-control agents. Ulocladium spp. are often found on Dead Vegetation, in soil, air and dust, but also on food and feedstuffs and on water-damaged building materials. The aim was to study the morphological and chemical diversity within the genus Ulocladium. Cultures of 52 Ulocladium strains were identified morphologically, and then extracted and analyzed using automated Chemical Image Analysis. Production of individual metabolites was correlated to species identity and source of isolation (substratum). Chemical analyses corroborated the morphological identifications and showed the existence of several species species-specific metabolites, of which most were known compounds. The production of curvularins was specific to Ulocladium atrum, while most species produced infectopyrones and derivatives of altertoxin I. None of the 52 Ulocladium strains produced alternariols, tenuazonic acid, altersolanols or macrosporin, which are common in species of Alternaria.