IANIGLA   20881
INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Dendrochronogical reconstructions of western spruce budworm (Choristoneura occidentalis Freeman) at McCall Lakes, Peachland, British Columbia, Canada
Autor/es:
ALFARO, RENE; AXELSON, JODI; LEWIS, KATHY; BARICHIVICH, JONATHON; DURAN, LARA; GEE, HUGO; HAAVIC, LAUREL; HARDY, KEVIN; JONES, EILEEN; LOPEZ, LIDIO; MANSILLA, CLAUDIA; PEÑA, MARIA PAZ; SUAREZ, MARIA LAURA
Lugar:
Las Vegas, USA
Reunión:
Congreso; 2009 AAG ANNUAL MEETING; 2009
Institución organizadora:
Association of American Geographers
Resumen:
Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) forest in the
Southern Interior of British Columbia, Canada, have been known to have
periodic defoliation due to western spruce budworm (WSB) (Choristoneura
occidentalis Freeman) outbreaks. Insect defoliators cause a
reduction in annual growth during an outbreak and these reductions are
visible in the tree-ring record. In this study, we identify WSB
outbreaks using dendrochronological methods. We used increment
cores from Douglas-fir growing in an area of known defoliation in the
Peachland area of the Okanagan Forest District. We used cores
collected from ponderosa pine (Pinus ponderosa), a non-host species, to
differentiate growth reductions caused by WSB outbreaks versus climatic
effects (i.e., drought). We used the software program OUTBREAK to
identify the timing, duration and magnitude of WSB outbreaks. We were
able to identify eight distinct outbreak events in 202 years of record.
Dendrochronological data was compared against the Forest Insect Disease
Survey (FIDS), and to specific defoliation measurements taken at the
site over eight year period.