Variability of selected traits of Ips typographus (L.) (Col.: Scolytinae) populations in Beskid Żywiecki (Western Carpathians, Poland) region affected by bark beetle outbreak

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dc.contributor.authorGrodzki, Wojciech
dc.contributor.authorStarzyk, Jerzy R.
dc.contributor.authorKosibowicz, Mieczysław
dc.contributor.organizationForest Research Institute, Department of Mountain Forestry, Krakówpl_PL
dc.contributor.organizationUniversity of Agriculture in Krakow, Chair of Forest Protection, Forest Entomology and Forest Climatologypl_PL
dc.date.accessioned2014-10-06T11:56:19Z
dc.date.available2014-10-06T11:56:19Z
dc.date.issued2014
dc.description.abstractIn 2010–2012, investigations on Ips typographus populations were carried out in Norway spruce stands recently affected by bark beetle outbreak in the Beskid Żywiecki Mts. in Poland. The aim of the study was to test the usefulness of several traits describing I. typographus populations for evaluation of their actual outbreak tendency. Infestation density, sex ratio, gallery length, progeny number and beetle length were used as the traits. Trait variability was analyzed in relation to infested tree mortality in the current year of observation and outbreak tendency defined by the comparison of data on tree mortality in the current year and that in the year before. The highest infestation density was found in the stands representing the highest tree mortality in the current year and in those characterized by decreasing outbreak tendency. The gallery system with 2 maternal galleries dominated. The sex ratio of attacking beetles inclined towards females (63.8%) and remained stable during 3 years of observations; the highest percentage of females was found in locations being in stabilization/latency outbreak phase. The length of maternal galleries was somewhat negatively affected by infestation density and positively correlated with the number of progeny in the gallery. The average beetle length was 4.800 mm (± 0.293), ranging between 3.718 and 5.817 mm and being the highest in the uppermost class of tree mortality recorded in the current year of observation. The shortest beetles were collected in the stands with increasing outbreak tendency, and slightly longer – in the stands with outbreak stable and decreasing tendencies. None of the traits tested can be selected as a direct indicator for prediction of outbreak tendency in I. typographus populations. Possible reasons of variability in the analyzed traits are discussed. The traits indicate that I. typographus in the study area represent very high reproductive potential, thus the risk of repeated outbreak is very high.pl_PL
dc.description.epersonPrzemysław Szmit
dc.identifier.doi10.2478/ffp-2014-0008
dc.identifier.urihttps://open.icm.edu.pl/handle/123456789/5377
dc.language.isoenpl_PL
dc.publisherInstytut Badawczy Leśnictwa (Forest Research Institute), Komitet Nauk Leśnych PAN (The Committee on Forestry Sciences of the Polish Academy of Sciences)pl_PL
dc.rightsUznanie autorstwa-Na tych samych warunkach 3.0 Polska
dc.rights.urihttp://creativecommons.org/licenses/by-sa/3.0/pl/
dc.subjectpopulation dynamicspl_PL
dc.subjectbody lengthpl_PL
dc.subjectsex ratiopl_PL
dc.subjectprogenypl_PL
dc.subjectgalleriespl_PL
dc.subjectbark beetlespl_PL
dc.titleVariability of selected traits of Ips typographus (L.) (Col.: Scolytinae) populations in Beskid Żywiecki (Western Carpathians, Poland) region affected by bark beetle outbreakpl_PL
dc.typearticlepl_PL
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