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Do pheromone trapping always reflect Ips typographus (L.) population level? A study from the Tatra National Park in Poland

Wojciech Grodzki
Wojciech Grodzki
   | 13 mars 2021
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Article Category: Original article
Publié en ligne: 13 mars 2021
Pages: 36 - 47
Reçu: 29 oct. 2020
Accepté: 27 déc. 2020
DOI: https://doi.org/10.2478/ffp-2021-0004
© 2021 Wojciech Grodzki, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1

The area of the Tatra National Park with the location of pheromone traps and the “western” and “eastern” areas affected by wind damage used for the analysis; an example of spots with standing dead trees detected in the subsequent years in a circular zone of 500 m around the trap is shown in the upper left corner
The area of the Tatra National Park with the location of pheromone traps and the “western” and “eastern” areas affected by wind damage used for the analysis; an example of spots with standing dead trees detected in the subsequent years in a circular zone of 500 m around the trap is shown in the upper left corner

Figure 2

Mean area with standing dead trees detected in 500 m circular zone around 23 locations with the traps in the TPN area in individual years (2016 – no data)
Mean area with standing dead trees detected in 500 m circular zone around 23 locations with the traps in the TPN area in individual years (2016 – no data)

Figure 3

The total area with standing dead trees detected in the “western” and “eastern” area of study in individual years (2016 – no data)
The total area with standing dead trees detected in the “western” and “eastern” area of study in individual years (2016 – no data)

Figure 4

Volume of trees infested by bark beetles processed in the entire active protection zone of the Tatra National Park in the years 2010–2019
Volume of trees infested by bark beetles processed in the entire active protection zone of the Tatra National Park in the years 2010–2019

Figure 5

Volume of trees infested by bark beetles processed in the “western” (A) and “eastern” (B) area of study in individual years in 2010–2019
Volume of trees infested by bark beetles processed in the “western” (A) and “eastern” (B) area of study in individual years in 2010–2019

Figure 6

Mean number of I. typographus beetles captured in one trap in individual years, calculated from all 23 traps operated in the TPN
Mean number of I. typographus beetles captured in one trap in individual years, calculated from all 23 traps operated in the TPN

Figure 7

Mean number of I. typographus beetles captured in one trap in individual years, calculated for “western” (5 localities) and “eastern” (5 localities) study area in the TPN
Mean number of I. typographus beetles captured in one trap in individual years, calculated for “western” (5 localities) and “eastern” (5 localities) study area in the TPN

Share of beetles captured in all the 23 pheromone traps in individual years till the end of June and July and correlation coefficients related to the captures from entire trapping period (May–August). All the correlations are significant at p < 0.01

Year Beetles captured till the end of June Beetles captured till the end of July
share [%] correlation r share [%] correlation r
2010 52.6 0.845 87.0 0.987
2011 57.3 0.980 86.4 0.998
2012 60.4 0.975 85.4 0.991
2013 49.8 0.916 76.2 0.980
2014 45.8 0.942 77.8 0.983
2015 23.6 0.815 79.9 0.964
2016 32.2 0.846 76.3 0.981
2017 31.8 0.519 71.6 0.969
2018 70.2 0.933 85.9 0.990
2019 54.7 0.935 81.6 0.969

Spearman rank correlation coefficients between mean yearly captures per trap and tree mortality

Tree mortality expressed by Western area Eastern area
rs p rs p
Area of spots with dead trees 0.714 n.s. 0.657 n.s.
Volume with and of left processed by insects trees 0.018 n.s. 0.055 n.s.
Volume with insects of processed trees 0.430 n.s. 0.067 n.s.

Area of detected occurrence of new standing dead trees detected in subsequent years in the concentric zones around the 23 locations of pheromone traps in the entire TPN area, using 100, 200 and 500 m radius

Radius of concentric zone (m) Area (ha) with standing dead trees within the zones in the year
2011 2012 2013 2014 2015 2017
100 0.00 0.06 0.00 0.00 0.08 1.15
200 1.30 0.28 0.49 0.35 0.10 12.48
500 28.10 8.37 13.57 3.62 1.17 126.07
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