Birds girdling activity on exotic tree species as a form of adaptive behavior?
Idioma
en
Article de revue
Este ítem está publicado en
Contemporary Problems of Ecology. 2017, vol. 10, n° 2, p. 193-202
Springer
Resumen en inglés
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 ...Leer más >
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.< Leer menos
Palabras clave
arborétum
transpiration des feuilles
nidification
république tchèque
phénologie
xylème
oiseau
Palabras clave en inglés
Cladrastis kentukea (Dum. Cours.) Rudd
FTIR spectra
middle-spotted woodpecker Dendocopos medius
phenology
transpiration stream
xylem sap
arboreta
nesting
xylem
Orígen
Importado de HalCentros de investigación