FAKTORI KOJI POMAŽU IZDVAJANJU BENTOSKIH CIJANOBAKTERIJA IZ FAZA MIROVANJA: PREGLED

The sediment-water interface in aquatic systems is an environment connecting bottom sediments with the overlying water column. This transition zone can be easily disturbed by mechanical mixing (bioturbation) caused by foraging fish and/or macroinvertebrates moving around and stirring sediment layers. The sediment of still water ecosystems is largely known as a reservoir of resting stages of various planktonic plants, including cyanobacteria (blue-green algae) and invertebrates. The ecological and evolutionary dynamics of cyanobacteria is in part a function of the numbers and ages of diapausing stages hatching from aquatic sediments. Successful recruitment from this ”seed bank” must depend upon the resting stages being present at or near the sediment surface. Often, however, they are found as deep as 15 to 30 cm in the mud. Bioturbation may thus provide a mechanism for the regular return of buried cyanobacteria resting stages to the sediment surface.Prostor površine bentala (sediment-voda) je okoliš koji povezuje sediment dna i stupac vode iznad. Ova prijelazna zona lako se može uznemiriti mehaničkim miješanjem (bioturbacijom) uzrokovanim ribom koja je u potrazi za hranom i kretanjem makrozoobentosa kroz slojeve sedimenta. Sediment ekosustava stajaćica uglavnom je poznat kao “rezervoar” za mirovanje različitih planktonskih biljaka, uključujući cijanobakterije (modrozelene alge) i beskralježnjake. Ekološka i evolucijska dinamika cijanobakterija ima utjecajnu ulogu za brojne generacijske stadije mirovanja nastale u akvatičnom ekosustavu. Uspješno izdvajanje iz tih “banki stanica” mora ovisiti o fazama mirovanja u/ili blizu površine sedimenta. Međutim, cijanobakterije se često nalaze 15 do 30 cm dubine u mulju. Mehaničko miješanje (bioturbacija) može osigurati povratak ukopanih cijanobakterija iz faza mirovanja na površinu sedimenta

Diet Composition and Selectivity in O+ Perch (Perca fluviatilis L.) and its Competition with Adult Fish and Carp (Cyprinus carpio L.) Stock in Pond Culture

Food composition and selectivity of 0+ perch (Perca fluviatilis) were studied under the experimental pond conditions during the growing season in 2000. The diet of perch fry consisted mainly of chironomid larvae and pupae and zooplankton, mainly cladocerans (Bosmina longirostris, Chydorus sp., Ceriodaphnia sp., Alona sp.) and copepods. Both chironomids and cladocerans were consumed with positive selectivity. The food items of lesser importance were water beetles (genera Rhantus, Hydrobius and Hydroporus), water bugs Corixa affinis and mayfly larvae Caenis sp. Chironomid larvae were most important food items also in the diet of both adult perch and 2+ carp. Also 0+ perch contributed considerably to the diet of adult perch and benthic food resources (bryozoans and organic debris) including supplied feed cereals were of biggest importance for common carp. The perch competes with parental fish and common carp for approximately one third of available food items, whilst adult perch and carp compete for a half of them

FAKTORI KOJI POMAŽU IZDVAJANJU BENTOSKIH CIJANOBAKTERIJA IZ FAZA MIROVANJA: PREGLED

The sediment-water interface in aquatic systems is an environment connecting bottom sediments with the overlying water column. This transition zone can be easily disturbed by mechanical mixing (bioturbation) caused by foraging fish and/or macroinvertebrates moving around and stirring sediment layers. The sediment of still water ecosystems is largely known as a reservoir of resting stages of various planktonic plants, including cyanobacteria (blue-green algae) and invertebrates. The ecological and evolutionary dynamics of cyanobacteria is in part a function of the numbers and ages of diapausing stages hatching from aquatic sediments. Successful recruitment from this ”seed bank” must depend upon the resting stages being present at or near the sediment surface. Often, however, they are found as deep as 15 to 30 cm in the mud. Bioturbation may thus provide a mechanism for the regular return of buried cyanobacteria resting stages to the sediment surface.Prostor površine bentala (sediment-voda) je okoliš koji povezuje sediment dna i stupac vode iznad. Ova prijelazna zona lako se može uznemiriti mehaničkim miješanjem (bioturbacijom) uzrokovanim ribom koja je u potrazi za hranom i kretanjem makrozoobentosa kroz slojeve sedimenta. Sediment ekosustava stajaćica uglavnom je poznat kao “rezervoar” za mirovanje različitih planktonskih biljaka, uključujući cijanobakterije (modrozelene alge) i beskralježnjake. Ekološka i evolucijska dinamika cijanobakterija ima utjecajnu ulogu za brojne generacijske stadije mirovanja nastale u akvatičnom ekosustavu. Uspješno izdvajanje iz tih “banki stanica” mora ovisiti o fazama mirovanja u/ili blizu površine sedimenta. Međutim, cijanobakterije se često nalaze 15 do 30 cm dubine u mulju. Mehaničko miješanje (bioturbacija) može osigurati povratak ukopanih cijanobakterija iz faza mirovanja na površinu sedimenta

Diet Composition and Selectivity in O+ Perch (Perca fluviatilis L.) and its Competition with Adult Fish and Carp (Cyprinus carpio L.) Stock in Pond Culture

Food composition and selectivity of 0+ perch (Perca fluviatilis) were studied under the experimental pond conditions during the growing season in 2000. The diet of perch fry consisted mainly of chironomid larvae and pupae and zooplankton, mainly cladocerans (Bosmina longirostris, Chydorus sp., Ceriodaphnia sp., Alona sp.) and copepods. Both chironomids and cladocerans were consumed with positive selectivity. The food items of lesser importance were water beetles (genera Rhantus, Hydrobius and Hydroporus), water bugs Corixa affinis and mayfly larvae Caenis sp. Chironomid larvae were most important food items also in the diet of both adult perch and 2+ carp. Also 0+ perch contributed considerably to the diet of adult perch and benthic food resources (bryozoans and organic debris) including supplied feed cereals were of biggest importance for common carp. The perch competes with parental fish and common carp for approximately one third of available food items, whilst adult perch and carp compete for a half of them

Constraining models of twin peak quasi-periodic oscillations with realistic neutron star equations of state

Twin-peak quasi-periodic oscillations (QPOs) are observed in the X-ray power-density spectra of several accreting low-mass neutron star (NS) binaries. In our previous work we have considered several QPO models. We have identified and explored mass-angular-momentum relations implied by individual QPO models for the atoll source 4U 1636-53. In this paper we extend our study and confront QPO models with various NS equations of state (EoS). We start with simplified calculations assuming Kerr background geometry and then present results of detailed calculations considering the influence of NS quadrupole moment (related to rotationally induced NS oblateness) assuming Hartle-Thorne spacetimes. We show that the application of concrete EoS together with a particular QPO model yields a specific mass-angular-momentum relation. However, we demonstrate that the degeneracy in mass and angular momentum can be removed when the NS spin frequency inferred from the X-ray burst observations is considered. We inspect a large set of EoS and discuss their compatibility with the considered QPO models. We conclude that when the NS spin frequency in 4U 1636-53 is close to 580Hz we can exclude 51 from 90 of the considered combinations of EoS and QPO models. We also discuss additional restrictions that may exclude even more combinations. Namely, there are 13 EOS compatible with the observed twin peak QPOs and the relativistic precession model. However, when considering the low frequency QPOs and Lense-Thirring precession, only 5 EOS are compatible with the model.Comment: 12 pages, 9 figures, 3 tables, accepted for publication in The Astrophysical Journa

Dietary Inclusion of Crickets (Acheta domesticus) and Yellow Mealworm Meal (Tenebrio molitor) in Comparison with Soybean Meal: Effect on the Growth, Total Tract Apparent Digestibility, and Nitrogen Balance of Fattening Rabbits

Three diets were formulated, i.e., soybean meal (SM diet), adult Acheta domesticus (AD diet), and Tenebrio molitor larvae (TM diet), as the main crude protein (CP) sources. A total of 45 rabbits (Hyplus, weaned at 32 days of age) were divided into three groups (15 per treatment) and fed one of the three diets for 42 days. A higher daily weight gain (p = 0.042), as well as daily feed intake (p = 0.022), was observed in rabbits fed the AD and TM diets than in rabbits fed the SM diet within 21 days after weaning. The coefficients of total tract apparent digestibility (CTTAD) of gross energy were higher (p = 0.001) in rabbits fed the SM diet than in rabbits fed the other diets. The CTTAD of CP (p = 0.040) and starch (p = 0.041) was higher in rabbits fed the SM diet compared to those fed the AD diet. There were non-significantly higher losses of nitrogen in the urine (an average by 0.227 g/day; p = 0.094) in rabbits fed the TM diet than in rabbits fed the other diets. It can be concluded that the growth of rabbits and nitrogen output were not detrimentally affected by the insect meal (AD or TM) used in this study

A report about project DG16P02M032 NAKI II servis performance in 2018

Monitoring of the environment and zooplankton, zoobenthos and fish assemblages of ponds and waterbodies in Czech castle parks was performed. The results were used as a source data for proposals and evaluations of biomanipualtion and biomeliorative measures on selected reservoirs

The survey of fish stock composition of selected pilot sites

The screening survey of fish stock composition was performed at the pilot sites of future monitoring, namely in the facilities of the Kroměříž Castle (reservoirs and ponds in the garden and park), Lednice Castle (park pond), Ploskovice Castle (park pond), Červené Poříčí (park pond) and Němčice reservoir (flood protection)