TOMASKOVA, Ivana; BAZANT, Vaclav; BLEHA, Roman; VITAMVAS, Jan; DELZON, Sylvain; STASTNY, Karel; VACKAR, Jiri

doi:10.1134/S1995425517020135

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TOMASKOVA, Ivana
Faculty of Forestry and Wood Sciences

BAZANT, Vaclav
Faculty of Forestry and Wood Sciences

BLEHA, Roman
Faculty of Food and Biochemical Technology

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Article de revue

Ce document a été publié dans

Contemporary Problems of Ecology. 2017, vol. 10, n° 2, p. 193-202

Springer

Résumé en anglais

Four tree species in the Kostelec n. . l. arboretum (Czech Republic) have been repeatedly damaged by Dendrocopos medius. The unique aspect of this otherwise common behavior called girdling consists in regularly visiting the same trees every spring, although there are more than 1.200 tree species within the arboretum. We monitored transpiration, leaf phenology and the chemical composition of the xylem sap of girdled and nongirdled trees. Spectral analysis revealed slightly higher amounts of sugars, especially saccharose, in Cladrastis Raf. as the most regularly girdled tree among other conditions, comparing girdled to non-girdled trees. Higher transpiration rates were not confirmed in connection with girdling-quite the opposite-Cladrastis Raf. as the most highly favored tree for girdling showed the lowest transpiration rates (in average 6 kg water per day within spring months) compared to other non-girdled trees. We presume that the birds do not choose a particular tree on the basis of any visible or chemical traits but they examine many trees within their territory. Afterwards they probably remember the position of trees whose xylem sap starts to flow early in the spring compared to other trees, as their transpiration stream is enriched with sweet organic substances that represent an advantage for the forthcoming nesting period.< Réduire

Mots clés

arborétum

transpiration des feuilles

nidification

république tchèque

phénologie

xylème

oiseau

Mots clés en anglais

Cladrastis kentukea (Dum. Cours.) Rudd

FTIR spectra

middle-spotted woodpecker Dendocopos medius

phenology

transpiration stream

xylem sap

arboreta

nesting

xylem