Search Results

You are looking at 1 - 4 of 4 items for

  • Author: Gábor Markó x
Clear All Modify Search
Open access

Tibor L. Alpár and Gábor Markó

Abstract

Medium density fiberboards are widely produced and used in Europe. The main raw materials used in Hungary are beech (Fagus sylvatica), hornbeam (Carpinus betulus), poplar (Populus spp.) and pine (Pinus spp.). Governmental subsidizing of biomass for power plants has created economic pressure and a shortage of wood prompting a major producer of energy grass to initialize a project to examine the possibility for the production of MDF from energy grass “Szarvasi-1” (Elymus elongatus (Agropyron elongatum) cv. Szarvasi-1). Prior to this, no research results on the experimental production of MDF from energy grass had been published. In our research study, energy grass was defibrated and MDF boards were produced with the use of different adhesives. Standard tests were completed to evaluate the suitability of this alternate raw material in MDF production. The best result was achieved with phenol formaldehyde (PF) adhesive.

Open access

Gábor Markó, Manuel Azcárate, Gergely Hegyi, Gábor Herceg, Miklós Laczi, Gergely Nagy, Juan Carlos Señar, János Török and László Zsolt Garamszegi

Abstract

In birds, individuals may show different behavioural and physiological responses when handling, and such variation may be related to individual differences in antipredator strategies. We performed a pilot study in both breeding and wintering populations of the Great Tit (Parus major), and we characterised three typical behavioural traits during a standard ringing procedure in captured birds. We assessed between- individual variations in breath rate, pecking rate and the number of distress calls displayed in response to handling, and also calculated the within-individual variation of these traits by repeated behavioural measurements. We found that these behaviours were consistently displayed within individuals (with repeatability varying between 0.44 and 0.82), and there was also some modest correlation between them (e.g. breath rate covaried with the number of distress calls). Furthermore, using multivariate linear models assessing a role of some potential predictors we found that a considerable amount of between-individual variation can be explained by sex and age differences and also by variation in body condition. However, the magnitude and direction of these relationships was inconsistent across seasons. Our results are in line with previous findings that several consistent behavioural traits measured during human handling could reflect individual specific antipredator strategy, but some confounding effects cannot be ruled out. Hence, our preliminary results require careful interpretation, and further studies are needed to assess the exact magnitude by which different behavioural traits are inter-related

Open access

Katalin Krenhardt, Gábor Markó, Eszter Szász, Mónika Jablonszky, Sándor Zsebők, János Török and László Zsolt Garamszegi

Summary

Different experiences from the past may have influence on individual’s behaviour through feedback mechanisms that can weaken or preserve the within-individual consistency of behavioural traits. Here, we aimed to find evidence for such feedback mechanisms that may operate on risk-taking behaviour via the effect of former experience to potential predation events in male Collared Flycatchers (Ficedula albicollis). We predicted that risk-taking of males would decrease after experiencing a predator’s attack in previous breeding seasons (negative feedback). We assessed risk-taking by flight initiation distance (FID) that is the distance at which an individual flees from an approaching predator, which was estimated for 234 individuals from different breeding seasons. Information on predation experience (i.e. occurrence of nest predation, the incidence of capture by human observers) was available from our long-term database on individual life histories. In a horizontal approach, we found no difference in FID when comparing males with former experience to predation with males naive to predators. A longitudinal approach relying on the repeated tests of the same individuals from different years yielded analogous results, we could not show a significant change in the risk-taking behaviour of the males as a consequence of experience to predation in past years. However, we found that individuals systematically took less risk over the years, which might be a consequence of acquiring general experience with age.

Open access

Nóra Boross, Gábor Markó, Miklós Laczi, László Zsolt Garamszegi, Gergely Hegyi, Márton Herényi, Dorottya Kiss, Gergely Nagy, Balázs Rosivall, Eszter Szöllősi and János Török

Abstract

The haematocrit rate of the blood shows the individual physiological state. As the haematocrit grows, the higher erythrocyte number results in more efficient oxygen uptake capacity which can lead to better performance and probably a better survival rate of an individual. Hence we assume that the high value of haematocrit reflects good health state. Altogether 308 blood samples were collected from a wild population of Collared Flycatchers (Ficedula albicollis) in two breeding stages during a period of 2008-2010. We tried to elucidate the relationship between condition and haematocrit level of an individual and studied the haematocrit changes of an individual between years. The haematocrit values differed between years. Females had higher haematocrit values than males in 2010 but not in 2009. At courtship the haematocrit level of males was higher, than during nestling care. The different environmental effects and energy demands of the individuals may be the driving force behind the observed changes in haematocrit level. Analysing the changes between two years, there was a positive correlation between changes in condition index and haematocrit of individuals. The haematocrit values of an individual were repeatable between years. This finding suggests that haematocrit can be informative about the individual’s general health state.