Canopy arthropod communities in relation to forest age and alternative harvest practices in western Oregon

Arthropod community structure and herbivory were compared in replicate Douglas-fir and western hemlock canopies in intact old-growth (> 400-year-old), and Douglas-fir only in partially harvested old-growth, natural mature (150-year-old) stand, and regenerating plantations (10–20-year-old) in a 15...

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Bibliographic Details
Published in:Forest ecology and management 1995-10, Vol.78 (1-3), p.115-125
Main Author: Schowalter, T.D.
Format: Article
Language:English
Subjects:
AGE
Animal and plant ecology
Animal, plant and microbial ecology
ARTHROPODA
BIODIVERSIDAD
BIODIVERSITE
BIODIVERSITY
Biological and medical sciences
BOSQUE VIRGEN
CANOPY
COSECHA
COUVERT
CUBIERTA DE COPAS
Disturbance
Diversity
EDAD
FOREST PLANTATIONS
FORET VIERGE
Fundamental and applied biological sciences. Psychology
HARVESTING
HERBIVORE
HERBIVORES
HERBIVOROS
Herbivory
OREGON
PLANT ANIMAL RELATIONS
PLANTACION FORESTAL
PLANTATION FORESTIERE
Pseudotsuga
PSEUDOTSUGA MENZIESII
RECOLTE
RELACIONES PLANTA ANIMAL
RELATION PLANTE ANIMAL
Succession
Synecology
Terrestrial ecosystems
Tsuga
TSUGA HETEROPHYLLA
VIRGIN FORESTS
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Summary:Arthropod community structure and herbivory were compared in replicate Douglas-fir and western hemlock canopies in intact old-growth (> 400-year-old), and Douglas-fir only in partially harvested old-growth, natural mature (150-year-old) stand, and regenerating plantations (10–20-year-old) in a 15 000 ha area including the H.J. Andrews Experimental Forest in western Oregon. Species diversity and abundances of several taxa, especially predators and detritivores, were significantly lower in plantations compared to older forests. Mature, old-growth, and partially harvested stands showed few significant differences, but principal components analysis suggested some differences in community structure and indicated that old-growth was least variable (tighter clustering) in arthropod diversity and abundance, whereas partially harvested stands were most variable. Defoliation was higher in the mature stands, probably because these stands were composed of relatively dense and pure Douglas-fir. Although old-growth appeared to be the source of greatest arthropod biodiversity in these forests, arthropod communities in Douglas-fir canopies may largely recover old-growth structure by 150 years, and partially harvested stands retain substantially greater arthropod diversity than do regenerating plantations.
ISSN:0378-1127
1872-7042
DOI:10.1016/0378-1127(95)03592-4