Występowanie i śmiertelność poszczególnych stadiów rozwojowych rytownika pospolitego Pityogenes chalcographus (L.) (Coleoptera: Curculionidae) na gałęziach świerkowych w okresie zimy

Jarosław Bielan

Abstract

The effect of microclimatic conditions on the mortality of different developmental stages of Pityogenes chalcographus (L.), wintering in feeding grounds on spruce branches left on the forest floor under the snow cover was studied in spruce stands of Wisła Forest District in winter 2011–2012. The average temperature under the snow was –1.72°C and the minimum temperature dropped to –14°C, while the average relative humidity of air fluctuated around 96% (Fig. 1). The average temperature at 6 m above the ground in winter was –3.48°C and the minimum temperature reached –26°C. The average relative humidity of air at this height fluctuated around 89% (Fig. 2). The average thickness of snow cover during the whole winter was 95 cm (Fig. 1). The snow cover probably affects the air temperature and humidity at ground level. Frequency of the occurrence of old adults on the analyzed spruce branches (the average bark thickness was about 0.36 cm (Tab. 1)), was 100.00%, larvae – 98.33%, young adults – 81.67% and pupae – 3.33%. The total mortality was determined after examining 5216 larvae, 1346 young imago individuals and 822 old imago individuals of P. chalcographus. The presence of 4 pupae was also found (Tab. 2). In spring, after the snow disappeared, the mortality of overwintering larvae was low – 24.41%. The mortality of young adults was 32.30%. Definitely, the highest mortality occurred in old imago individuals – 45.91% (Tab. 3). This was most likely due to the natural aging process.
Author Jarosław Bielan (FoF / DoFPFEaC)
Jarosław Bielan,,
- Department of Forest Protection, Forest Entomology and Climatology
Other language title versionsThe occurrence and mortality of different developmental stages of six-toothed spruce bark beetle Pityogenes chalcographus (L.) (Coleoptera: Curculionidae) on spruce branches in winter
Pages141-152
Publication size in sheets0.55
Book Ząbecki Wojciech (eds.): Rola i udział owadów w funkcjonowaniu ekosystemów leśnych, 2013, Wydawnictwo Uniwersytetu Rolniczego, ISBN 978-83-60633-92-2, 349 p.
Keywords in Polishzimowanie, stadium rozwojowe, pokrywa śniegu, wilgotność względna powietrza, temperatury minimalne, świerk pospolity, Picea abies
Keywords in Englishwintering, developmental stage, snow cover, relative humidity, minimal temperatures, Norway spruce, Picea abies
Abstract in PolishW drzewostanach świerkowych Nadleśnictwa Wisła badano wpływ temperatury i wilgotności względnej powietrza oraz pokrywy śniegu na śmiertelność różnych stadiów rozwojowych Pityogenes chalcographus (L.), zimujących na gałęziach Picea abies (L.) H. Karst, na dnie lasu pod warstwą śniegu. Przy minimalnych temperaturach pod pokrywą śniegu dochodzących do –14°C, a na wysokości 6 m nad powierzchnią gruntu osiągających –26°C, stwierdzono najniższą śmiertelność u stadium larwy (24,41%). Wyższa była śmiertelność młodych imagines – 32,30%, a najwyższa imagines starych – 45,91%.
Languagepl polski
Score (nominal)4
ScoreMinisterial score = 5.0, 27-07-2017, BookChapterNotSeriesNotMainLanguages
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