2017
|
 | Mezei, P; Jakuš, R; Pennerstorfer, J; Havašová, M; Škvarenina, J; Ferenčík, J; Slivinský, J; Bičárová, S; Bilčík, D; Blaženec, M; Netherer, S Storms, temperature maxima and the Eurasian spruce bark beetle Ips typographus — an infernal trio in Norway spruce forests of the Central European High Tatra Mountains Journal Article Agricultural and Forest Meteorology, 242 , pp. 85-95, 2017. Abstract | Links | BibTeX @article{Mezei2017,
title = {Storms, temperature maxima and the Eurasian spruce bark beetle \textit{Ips typographus} — an infernal trio in Norway spruce forests of the Central European High Tatra Mountains},
author = {P. Mezei and R. Jakuš and J. Pennerstorfer and M. Havašová and J. Škvarenina and J. Ferenčík and J. Slivinský and S. Bičárová and D. Bilčík and M. Blaženec and S. Netherer},
url = {http://ife.sk/wp-content/uploads/2016/10/Figure_4_20170406_2-pdf-300x192.jpghttp://www.sciencedirect.com/science/article/pii/S0168192317301326},
doi = {10.1016/j.agrformet.2017.04.004},
year = {2017},
date = {2017-04-10},
journal = { Agricultural and Forest Meteorology},
volume = {242},
pages = {85-95},
abstract = {Norway spruce forests (Picea abies Karst.) of the Carpathian High Tatra Mountains have been subject to unprecedented tree mortality caused by attacks of the Eurasian spruce bark beetle (Ips typographus L.) in recent decades. The outbreaks were preceded and accompanied by wind throw events and periods of increased seasonal temperature. We obtained climatic data and data on tree mortality due to storm throw and bark beetles by using a combination of direct dead tree inventory and remote sensing techniques, and examined annual tree loss change over a 26-year period in a forest district of the Slovak High Tatra National Park. In particular, we found that the combination of the previous year's maximum daily temperature sum, tree mortality caused by wind, and bark beetle-caused tree mortality best explained the annual tree loss change in nonlinear regression models. The number of trees infested by bark beetles clearly increased with maximum air temperature sums ranging from 2850 to 3150 ° days, but declined below or above this thermal optimum. Annual tree mortality clearly increased subsequent to years associated with seasonal temperature sums allowing for the development of sister broods. Given consistently favourable future climatic conditions for development of I. typographus populations in the study area, a possible shift from the now predominantly uni-voltine to multi-voltine bark beetle populations might increase attack pressure also at high elevation sites.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Norway spruce forests (Picea abies Karst.) of the Carpathian High Tatra Mountains have been subject to unprecedented tree mortality caused by attacks of the Eurasian spruce bark beetle (Ips typographus L.) in recent decades. The outbreaks were preceded and accompanied by wind throw events and periods of increased seasonal temperature. We obtained climatic data and data on tree mortality due to storm throw and bark beetles by using a combination of direct dead tree inventory and remote sensing techniques, and examined annual tree loss change over a 26-year period in a forest district of the Slovak High Tatra National Park. In particular, we found that the combination of the previous year's maximum daily temperature sum, tree mortality caused by wind, and bark beetle-caused tree mortality best explained the annual tree loss change in nonlinear regression models. The number of trees infested by bark beetles clearly increased with maximum air temperature sums ranging from 2850 to 3150 ° days, but declined below or above this thermal optimum. Annual tree mortality clearly increased subsequent to years associated with seasonal temperature sums allowing for the development of sister broods. Given consistently favourable future climatic conditions for development of I. typographus populations in the study area, a possible shift from the now predominantly uni-voltine to multi-voltine bark beetle populations might increase attack pressure also at high elevation sites. |
2016
|
 | Sedmáková, D; Sedmák, R; Bošela, M; Ježík, M; Sitko, R; Hlásny, T; Blaženec, M Cross-dating tree-ring series of living European beech by isochronic weather records Journal Article Geochronometria, 43 (1), pp. 48-58, 2016, ISSN: 1897-1695. Abstract | Links | BibTeX @article{Sedmáková2016,
title = {Cross-dating tree-ring series of living European beech by isochronic weather records},
author = {D. Sedmáková and R. Sedmák and M. Bošela and M. Ježík and R. Sitko and T. Hlásny and M. Blaženec},
url = {10.1515/geochr-2015-0030},
doi = {10.1515/geochr-2015-0030},
issn = {1897-1695},
year = {2016},
date = {2016-05-20},
journal = {Geochronometria},
volume = {43},
number = {1},
pages = {48-58},
abstract = {The main objective of the study is to facilitate cross-dating of sensitive tree-ring series from living European beech (Fagus sylvatica L.) trees in the absence of a regional chronology. The main idea lies in the preliminary dating of marker rings or ring patterns visually identified on the wood (before the ring-width measurements), which is independently validated through a moving correlation between a tentative reference chronology and instrumental climate records (after the ring-width measurements). Following the detection of low moving correlations, potentially misdated segments or series are re-examined and a new tentative reference chronology is constructed. The process is repeated as long as a higher correlation with climate is obtainable. The applicability of this method was investigated on three difficult-to-date sets of tree-ring series of beech trees which were growing at temperature-or precipitation-sensitive locations in under-canopy or canopy positions. A good ability of the combined method for the cross-dating was practiced on datasets almost impossible to cross-date by commonly used approaches. Highlighting the actual correlation of ring widths with climate in tree-ring series makes the cross-dating process more independent from human decisions, so the combined cross-dating has the potential to improve the reliability of various dendrochronological studies.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The main objective of the study is to facilitate cross-dating of sensitive tree-ring series from living European beech (Fagus sylvatica L.) trees in the absence of a regional chronology. The main idea lies in the preliminary dating of marker rings or ring patterns visually identified on the wood (before the ring-width measurements), which is independently validated through a moving correlation between a tentative reference chronology and instrumental climate records (after the ring-width measurements). Following the detection of low moving correlations, potentially misdated segments or series are re-examined and a new tentative reference chronology is constructed. The process is repeated as long as a higher correlation with climate is obtainable. The applicability of this method was investigated on three difficult-to-date sets of tree-ring series of beech trees which were growing at temperature-or precipitation-sensitive locations in under-canopy or canopy positions. A good ability of the combined method for the cross-dating was practiced on datasets almost impossible to cross-date by commonly used approaches. Highlighting the actual correlation of ring widths with climate in tree-ring series makes the cross-dating process more independent from human decisions, so the combined cross-dating has the potential to improve the reliability of various dendrochronological studies. |
 | Ježík, M; Blaženec, M; Kučera, J; Střelcová, K; Ditmarová, Ľ The response of intra-annual stem circumference increase of young European beech provenances to 2012-2014 weather variability Journal Article i-Forest, 9 (6), pp. 960-969, 2016, ISSN: 1971-7458. Abstract | Links | BibTeX @article{Ježík2016,
title = {The response of intra-annual stem circumference increase of young European beech provenances to 2012-2014 weather variability},
author = {M. Ježík and M. Blaženec and J. Kučera and K. Střelcová and Ľ. Ditmarová},
url = {http://www.sisef.it/iforest/contents/?id=ifor1829-009},
doi = {10.3832/ifor1829-009},
issn = {1971-7458},
year = {2016},
date = {2016-01-01},
journal = {i-Forest},
volume = {9},
number = {6},
pages = {960-969},
abstract = {The increasing frequency and severity of extreme weather events, especially droughts, arising from on-going climate changes negatively affect productivity and stability of forest ecosystems. Understanding species responses and suitable ecotypes that are able of adapting to new environmental conditions is increasingly important. The objective of this study was to quantify the relationships between the inter-annual stem circumference increase (SCI) of five European beech (Fagus sylvatica L.) provenances and weather variability during 2012-2014 in a provenance trial located in central Slovakia. SCIs were extracted on daily and weekly scale from hourly data of circumference changes. To detect the main environmental factors influencing SCI seasonal dynamics, intra-seasonal moving correlation functions were calculated. All five provenances responded synchronously to weather conditions, with high correlations among them during the growing season on both daily and weekly scale. The photoperiod exhibited a synchronizing effect on the seasonal peak of SCI as a sign of tree adaptation to long-term seasonal variations in climate. Temperature was the most significant factor influencing SCI dynamics at the beginning of the season. During the summer months, a precipitation deficit, heat waves and the consequently decreased soil water potential significantly affected the SCI of young beech trees, despite the fact that the provenance plot was situated in an area of optimum beech growth. Not only the severity and duration were important but also the timing of drought within a season. Within all seasons, the lowest SCI values were recorded for the provenance from the lowest altitude and the most oceanic climate (northern Germany). A comparison of daily and weekly SCI with first derivatives of growth functions indicated that SCIs were closely related to theoretical incremental processes, especially on a weekly scale. In young beech trees, SCI seemed to represent an appropriate proxy for studying intra-seasonal incremental processes. A newly designed SASB (self adjusting sharp beginning) function fit these processes better than the Gompertz function.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The increasing frequency and severity of extreme weather events, especially droughts, arising from on-going climate changes negatively affect productivity and stability of forest ecosystems. Understanding species responses and suitable ecotypes that are able of adapting to new environmental conditions is increasingly important. The objective of this study was to quantify the relationships between the inter-annual stem circumference increase (SCI) of five European beech (Fagus sylvatica L.) provenances and weather variability during 2012-2014 in a provenance trial located in central Slovakia. SCIs were extracted on daily and weekly scale from hourly data of circumference changes. To detect the main environmental factors influencing SCI seasonal dynamics, intra-seasonal moving correlation functions were calculated. All five provenances responded synchronously to weather conditions, with high correlations among them during the growing season on both daily and weekly scale. The photoperiod exhibited a synchronizing effect on the seasonal peak of SCI as a sign of tree adaptation to long-term seasonal variations in climate. Temperature was the most significant factor influencing SCI dynamics at the beginning of the season. During the summer months, a precipitation deficit, heat waves and the consequently decreased soil water potential significantly affected the SCI of young beech trees, despite the fact that the provenance plot was situated in an area of optimum beech growth. Not only the severity and duration were important but also the timing of drought within a season. Within all seasons, the lowest SCI values were recorded for the provenance from the lowest altitude and the most oceanic climate (northern Germany). A comparison of daily and weekly SCI with first derivatives of growth functions indicated that SCIs were closely related to theoretical incremental processes, especially on a weekly scale. In young beech trees, SCI seemed to represent an appropriate proxy for studying intra-seasonal incremental processes. A newly designed SASB (self adjusting sharp beginning) function fit these processes better than the Gompertz function. |
2015
|
 | Ježík, M; Blaženec, M; Letts, M G; Ditmarová, Ľ; Sitková, Z; Střelcová, K Assessing seasonal drought stress response in Norway spruce (Picea abies (L.) Karst.) by monitoring stem circumference and sap flow Journal Article Ecohydrology, 8 (3), pp. 378–386, 2015. Links | BibTeX @article{M.2015b,
title = {Assessing seasonal drought stress response in Norway spruce (\textit{Picea abies} (L.) Karst.) by monitoring stem circumference and sap flow},
author = {M. Ježík and M. Blaženec and M.G. Letts and Ľ. Ditmarová and Z. Sitková and K. Střelcová},
url = {http://onlinelibrary.wiley.com/doi/10.1002/eco.1536/full},
year = {2015},
date = {2015-04-01},
journal = {Ecohydrology},
volume = {8},
number = {3},
pages = {378–386},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
![Hodnotenie zdravotného stavu smreka vo vzťahu smreka k náletu podkôrneho hmyzu a k odumieraniu lesa [Evaluation of Norway spruce helath status in relationships with bark beetle outbreak and forest dying]](https://ife.sk/wp-content/uploads/2016/10/IFE_blazenec_02.png) | Jakuš, R; Cudlín, P; Slivinský, J; Mezei, P; Majdák, A; Blaženec, M Hodnotenie zdravotného stavu smreka vo vzťahu smreka k náletu podkôrneho hmyzu a k odumieraniu lesa [Evaluation of Norway spruce helath status in relationships with bark beetle outbreak and forest dying] Book Ústav ekológie lesa, Slovenská akadémia vied, Zvolen, 2015, ISBN: 978-80-89408-22-1. Links | BibTeX @book{Jakuš2015,
title = {Hodnotenie zdravotného stavu smreka vo vzťahu smreka k náletu podkôrneho hmyzu a k odumieraniu lesa [Evaluation of Norway spruce helath status in relationships with bark beetle outbreak and forest dying]},
author = {R. Jakuš and P. Cudlín and J. Slivinský and P. Mezei and A. Majdák and M. Blaženec},
url = {https://www.researchgate.net/publication/280014410_Hodnotenie_zdravotneho_stavu_smreka_vo_vztahu_k_naletu_podkorneho_hmyzu_a_k_odumieraniu_lesa},
isbn = {978-80-89408-22-1},
year = {2015},
date = {2015-01-01},
booktitle = {Prognosticko-informačné systémy pre zvýšenie efektívnosti manažmentu lesa},
publisher = {Ústav ekológie lesa, Slovenská akadémia vied},
address = {Zvolen},
keywords = {},
pubstate = {published},
tppubtype = {book}
}
|
![Princípy ochrany dospelých smrekových porastov pred podkôrnym hmyzom [Conservation principles of mature Norway spruce trees attacked by bark beetles]](https://ife.sk/wp-content/uploads/2016/10/IFE_blazenec_03.png) | Jakuš, R; Blaženec, M; Gurtsev, A I; Holuša, J; Hroššo, B; Křenová, Z; Longauerová, V; Lukášová, K; Majdák, A; Mezei, P; Slivinský, J Princípy ochrany dospelých smrekových porastov pred podkôrnym hmyzom [Conservation principles of mature Norway spruce trees attacked by bark beetles] Book Ústav ekológie lesa, Slovenská akadémia vied, Zvolen, 2015, ISBN: 978-80-89408-21-4. Links | BibTeX @book{Jakuš2015b,
title = {Princípy ochrany dospelých smrekových porastov pred podkôrnym hmyzom [Conservation principles of mature Norway spruce trees attacked by bark beetles]},
author = {R. Jakuš and M. Blaženec and A.I. Gurtsev and J. Holuša and B. Hroššo and Z. Křenová and V. Longauerová and K. Lukášová and A. Majdák and P. Mezei and J. Slivinský},
editor = {R. Jakuš and M. Blaženec},
url = {https://www.researchgate.net/publication/280883448_Principy_ochrany_dospelych_smrekovych_porastov_pred_podkornym_hmyzom},
isbn = {978-80-89408-21-4},
year = {2015},
date = {2015-01-01},
booktitle = {Prognosticko-informačné systémy pre zvýšenie efektívnosti manažmentu lesa},
publisher = {Ústav ekológie lesa, Slovenská akadémia vied},
address = {Zvolen},
keywords = {},
pubstate = {published},
tppubtype = {book}
}
|
2014
|
 | Mezei, P; Grodzki, W; Blaženec, M; Škvarenina, J; Brandýsová, V; Jakuš, R Host and site factors affecting tree mortality caused by the spruce bark beetle (Ips typographus) in mountainous conditions Journal Article Forest Ecology and Management, 331 , pp. 196–207, 2014. Links | BibTeX @article{P.2014b,
title = {Host and site factors affecting tree mortality caused by the spruce bark beetle (\textit{Ips typographus}) in mountainous conditions},
author = {P. Mezei and W. Grodzki and M. Blaženec and J. Škvarenina and V. Brandýsová and R. Jakuš},
url = {http://www.sciencedirect.com/science/article/pii/S0378112714004691},
year = {2014},
date = {2014-11-01},
journal = {Forest Ecology and Management},
volume = {331},
pages = {196–207},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
 | Binyameen, M; Jankuvová, J; Blaženec, M; Jakuš, R; Song, L; Schlyter, F; Andersson, M N Co-localization of insect olfactory sensory cells improves the discrimination of closely separated odour sources Journal Article Functional Ecology, 28 (5), pp. 1216–1223, 2014. Links | BibTeX @article{M.2014,
title = {Co-localization of insect olfactory sensory cells improves the discrimination of closely separated odour sources},
author = {M. Binyameen and J. Jankuvová and M. Blaženec and R. Jakuš and L. Song and F. Schlyter and M.N. Andersson},
url = {http://onlinelibrary.wiley.com/doi/10.1111/1365-2435.12252/abstract},
year = {2014},
date = {2014-03-03},
journal = {Functional Ecology},
volume = {28},
number = {5},
pages = {1216–1223},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
 | Mezei, P; Grodzki, W; Blaženec, M; Jakuš, R Factors influencing the wind-bark beetles’ disturbance system in the course of an Ips typographus outbreak in the Tatra Mountains Journal Article Forest Ecology and Management, 312 , pp. 67–77, 2014. Links | BibTeX @article{P.2014b,
title = {Factors influencing the wind-bark beetles’ disturbance system in the course of an \textit{Ips typographus} outbreak in the Tatra Mountains},
author = {P. Mezei and W. Grodzki and M. Blaženec and R. Jakuš},
url = {http://www.sciencedirect.com/science/article/pii/S0378112713006877},
year = {2014},
date = {2014-01-01},
journal = {Forest Ecology and Management},
volume = {312},
pages = {67–77},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
 | Sedmák, R; Sedmáková, D; Bošeľa, M; Marušák, R; Ježík, M; Murga, V; Blaženec, M Age estimation of Norway spruce using incomplete increment cores: testing new and improved methods Journal Article Dendrochronologia, 32 (4), pp. 327–335, 2014. Links | BibTeX @article{R.2014b,
title = {Age estimation of Norway spruce using incomplete increment cores: testing new and improved methods},
author = {R. Sedmák and D. Sedmáková and M. Bošeľa and R. Marušák and M. Ježík and V. Murga and M. Blaženec},
url = {http://www.sciencedirect.com/science/article/pii/S1125786514000599},
year = {2014},
date = {2014-01-01},
journal = {Dendrochronologia},
volume = {32},
number = {4},
pages = {327–335},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2012
|
 | Mezei, P; Jakuš, R; Blaženec, M; Belánová, S; Šmídt, J The relationship between potential solar radiation and spruce bark beetle catches in pheromone traps Journal Article Annals of Forest Research, 55 (2), pp. 243-252, 2012, ISSN: 18448135. Abstract | BibTeX @article{Mezei2012,
title = {The relationship between potential solar radiation and spruce bark beetle catches in pheromone traps},
author = {P. Mezei and R. Jakuš and M. Blaženec and S. Belánová and J. Šmídt},
issn = {18448135},
year = {2012},
date = {2012-01-01},
journal = {Annals of Forest Research},
volume = {55},
number = {2},
pages = {243-252},
abstract = {We analysed the relationship between the amount of potential solar radiation and spruce bark beetle Ips typographus(L.) catches in pheromone traps in an unmanaged nature reserve in the Carpathians (middle Slovakia region), from 2006 through 2009. This relationship was analysed under outbreak conditions. The number of traps varied in different years from 70 to 92. The traps were installed in spruce-forest-dominated stands affected by a windstorm in 2004. A GPS device was used to mark the position of the pheromone traps. The potential solar radiation was calculated with GIS tools for three different time periods in each year: with entire year, for main flight season of the spruce bark beetle and the spring swarming period. The relationship between the amount of potential solar radiation and the spruce bark beetle catches was statistically significant for each year and each time period except for the spring swarming in 2007, when the pheromone traps were not set up on time.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We analysed the relationship between the amount of potential solar radiation and spruce bark beetle Ips typographus(L.) catches in pheromone traps in an unmanaged nature reserve in the Carpathians (middle Slovakia region), from 2006 through 2009. This relationship was analysed under outbreak conditions. The number of traps varied in different years from 70 to 92. The traps were installed in spruce-forest-dominated stands affected by a windstorm in 2004. A GPS device was used to mark the position of the pheromone traps. The potential solar radiation was calculated with GIS tools for three different time periods in each year: with entire year, for main flight season of the spruce bark beetle and the spring swarming period. The relationship between the amount of potential solar radiation and the spruce bark beetle catches was statistically significant for each year and each time period except for the spring swarming in 2007, when the pheromone traps were not set up on time. |
2011
|
| Mezei, P; Jakuš, R; Blaženec, M; Belánová, S; Šmídt, J Population dynamics of spruce bark beetle in a nature reserve in relation to stand edges conditions Journal Article Folia Oecologica, 38 (1), pp. 73-79, 2011, ISSN: 13365266. Abstract | BibTeX @article{Mezei2011,
title = {Population dynamics of spruce bark beetle in a nature reserve in relation to stand edges conditions},
author = {P. Mezei and R. Jakuš and M. Blaženec and S. Belánová and J. Šmídt},
issn = {13365266},
year = {2011},
date = {2011-01-01},
journal = {Folia Oecologica},
volume = {38},
number = {1},
pages = {73-79},
abstract = {Over the period 2006–2009 spruce bark beetle (Ips typographus [L.]) population was monitored
after two windstorm events in a nature reserve in Slovak Ore Mountains. The monitoring was carried out with pheromone traps in three different forest edges: 1) edge of wind-felled trees area, 2)
disturbed stand edge and 3) undisturbed stand edge. The one-way ANOVAconfirmed statistically
significant differences among stand edges in each year and a post-hoc test was applied. In first
two years after the primary disturbance the most attractive for spruce bark beetle was the edge of
wind-felled trees area. After two years from the primary disturbance the most attractive became
the disturbed stand edge. The undisturbed stand edge showed a similar attractivity for spruce bark
beetles almost over the whole monitoring period.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Over the period 2006–2009 spruce bark beetle (Ips typographus [L.]) population was monitored
after two windstorm events in a nature reserve in Slovak Ore Mountains. The monitoring was carried out with pheromone traps in three different forest edges: 1) edge of wind-felled trees area, 2)
disturbed stand edge and 3) undisturbed stand edge. The one-way ANOVAconfirmed statistically
significant differences among stand edges in each year and a post-hoc test was applied. In first
two years after the primary disturbance the most attractive for spruce bark beetle was the edge of
wind-felled trees area. After two years from the primary disturbance the most attractive became
the disturbed stand edge. The undisturbed stand edge showed a similar attractivity for spruce bark
beetles almost over the whole monitoring period. |
 | Ježík, M; Blaženec, M; Střelcová, K; Ditmarová, Ľ The impact of the 2003-2008 weather variability on intra-annual stem diameter changes of beech trees at a submontane site in central Slovakia Journal Article Dendrochronologia, 29 , pp. 227-235, 2011. BibTeX @article{Ježík2011,
title = {The impact of the 2003-2008 weather variability on intra-annual stem diameter changes of beech trees at a submontane site in central Slovakia},
author = {M. Ježík and M. Blaženec and K. Střelcová and Ľ. Ditmarová},
year = {2011},
date = {2011-01-01},
journal = {Dendrochronologia},
volume = {29},
pages = {227-235},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2010
|
 | Kmeť, J; Ditmarová, Ľ; Priwitzer, T; Kurjak, D; Baláž, P; Blaženec, M Physiological limits – a possible cause of spruce decline Journal Article Beskydy, 3 (1), pp. 55-64, 2010, ISSN: 1803-2451. BibTeX @article{Kmeť2010,
title = {Physiological limits – a possible cause of spruce decline},
author = {J. Kmeť and Ľ. Ditmarová and T. Priwitzer and D. Kurjak and P. Baláž and M. Blaženec},
issn = {1803-2451},
year = {2010},
date = {2010-01-01},
journal = {Beskydy},
volume = {3},
number = {1},
pages = {55-64},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
