Michal Baláž

Michal Baláž
Katolícka univerzita v Ružomberku · Biology and Ecology

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23
Publications
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Publications

Publications (23)
Article
Many bird species breeding under optimal temperature conditions show higher reproductive success. However, less information can be found about how the reproductive output differs within one population and one breeding season. To find inter and intra-seasonal differences in several aspects of breeding ecology and breeding output we monitored 223...
Article
Wintering waterbirds were censused and the effect of ice cover on their abundance was studied on the Hron River (Slovakia) in mid-January 2007–2020. Altogether 24 sites along a 90-km stretch of the middle part of the river was surveyed, of which 23 were sites with running water (81 ha) and one with stagnant water (Kozmálovce reservoir; 63 ha). A to...
Article
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Hrčková L. & Baláž M. 2019: Pohlavné rozdiely v rozptylovom správaní vodnára potočného (Cinclus cinclus). Sylvia 55: 75-86. Rozptyl je presun jedinca z miesta narodenia na miesto reprodukcie (natálny rozptyl), alebo medzi miestami reprodukcie v rôznych rokoch (hniezdny rozptyl). Počas hniezdnych sezón 2009-2018 sme sledovali natálny a hniezdny rozp...
Article
Table 1 in original paper (Slobodník et al. 2017, Slovak Raptor Journal 11: 83–89) was published with incorrect data. Correct version is published here.
Article
Understanding the processes shaping the composition of assemblages in response to disturbance events is crucial for preventing ongoing biodiversity loss in forest ecosystems. However, studies of forest biodiversity responses to disturbance typically analyze immediate or short-term impacts only, while studies relating long-term disturbance history t...
Article
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Migratory waterbirds require an effectively conserved cohesive network of wetland areas throughout their range and life-cycle. Under rapid climate change, protected area (PA) networks need to be able to accommodate climate driven range shifts in wildlife if they are to continue to be effective in the future. Thus, we investigated geographical varia...
Article
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In the period between the years 1976 to 2016 we monitored the nesting site distribution of two populations of saker falcon ( Falco cherrug ) concentrated in the highlands and adjacent lowlands of western and eastern Slovakia. In western Slovakia we recorded nesting by 56 pairs and 514 nestings, and in eastern Slovakia we observed nesting by 32 pair...
Article
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Interspecific or intraspecific destruction of eggs by other small bird species (Passeriformes) is a relatively rare behaviour. It is known from studies of several new world species from families Mimidae and Troglodytidae, but it has never been documented in the Eurasian wren (Troglodytes troglodytes). While studying the breeding biology of the whit...
Article
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The Ural owl (Strix uralensis) is considered to be a habitat specialist preferring structurally heterogeneous old montane forests in Central Europe. Unlike the sympatric tawny owl (Strix aluco), the Ural owl is negatively affected by human activities in its forest habitats and usually avoids human settlements. Although the young birds and wintering...
Article
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Changes in nesting habitat of the saker falcon (Falco cherrug) influenced its diet composition and potentially threatened its population in Slovakia in the years 1976-2016 Zmena hniezdneho habitatu sokola rároha (Falco cherrug) mala vplyv na zloženie jeho potravy a hrozby pre populáciu na Slovensku v rokoch 1976-2016 Abstract: In the period between...
Article
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The population of the red-footed falcon in Slovakia inhabits the north-western edge of the species' breeding range. This breeding population is relatively small and came near to extinction during the population decline of this species in central Europe in recent decades. Thanks to increasing numbers of breeding pairs in Hungary, the Slovak populati...
Poster
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Pralesy sú poslednými zvyškami pôvodných lesných biotopov v Karpatoch. Ich štruktúra je ovplyvňovaná prírodnými procesmi, prevažne prírodnými narušeniami (disturbanciami). Tie vplývajú na všetky lesné organizmy. Vtáky (Aves) sú vhodnou modelovou skupinou vzhľadom na ich nápadnosť a tiež ich priamu závislosť na rôznych parametroch lesného prostredia...
Article
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Opportunistic predator like the long-eared owl is able to respond to population fluctuations of its main prey. The composition of the winter diet of this owl species was investigated during the period of 13 winters (1992–2000, 2006–2011) in agricultural areas in Slovakia. In total, we found 23 mammal species and 33 bird species (H = 0.82) in pellet...
Article
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Breeding bird communities of mountain spruce forests were studied in the Zapadne Tatry Mts. (northern Slovakia) during the breeding seasons of 1974-1979 and 2004-2006. The time-square (Turček's) method was used to estimate quantitative characteristics of bird assemblages during the first period, while territory mapping was applied during the second...
Article
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Temperature and precipitation are amongst the most important characteristics of local climatic conditions affecting the breeding biology of birds. Many bird species experiencing higher temperatures lay their eggs earlier and/or have bigger clutches. Higher precipitation can lead to a decrease in food availability and/or an increase of the costs of...
Article
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The common lizard, Zootoca vivipara (Lichtenstein, 1823), shows high variation in life histories and morphology across its range, which comprises almost the entire Palearctic region. However, this variation is not congruent with the species phylogeny. This suggests an important role of the environment in shaping the variation in morphology and life...
Article
Full-text available
The structural composition of the forest habitats is considered to be one of the most important factors affecting the breeding bird community composition. Structurally more homogenous forests are usually characterized by lower number of bird species and their densities. This study presents results of a comparison of the breeding bird communities in...
Article
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During the years 2008 and 2009 altogether 12 species of small mammals were registered within six localities in water dam Bešeňová surrounding. The most abundant species was Myodes glareolus, which was registered in all localities. Besides the bank vole, as eudominant species were characterized Apodemus flavicollis, Microtus arvalis and Sorex araneu...
Article
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The larvae of bird blow flies are obligatory hematophagous parasites with a wide range of altricial bird hosts. They mostly parasitize cavity-nesting birds and can cause serious damage to nestlings. In our study we analysed 248 bird nests from 37 localities in Slovakia, and recorded 22 avian host species of Protocalliphora flies from 24 localities...
Article
Full-text available
a b s t r a c t . v ariation in nest survival rates is often ascribed to differences in predator communities. Because corvids are the dominant nest predators in many landscapes with fragmented woodland, their absence may have effect on both the overall nest success and its relationship to habitat features. nest success of Sylvia atricapilla was exa...
Article
Full-text available
During the vegetation period 2001–2002 we studied the breeding biology of the red-backed shrike Lanius collurio Linnaeus, 1758 in the windbreaks of southwestern Slovakia. A total of 32 red-backed shrike nests were checked. Most of the nests were situated in shrubs with thorn and spines, predominantly about 1.5 m above the ground. Nest site selectio...

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