Download Ecological Scale and Forest Development: Squirrels, Dietary by Andrew B. Carey, Janet Kershner, Brian Biswell, Laura PDF
By Andrew B. Carey, Janet Kershner, Brian Biswell, Laura Domínguez de Toledo
Summary: Understandingecological strategies and their spatial scales is vital to handling ecosystems for
biodiversity, in particular for species linked to late-seral woodland. We all in favour of 2 species of squirrel (Sci-
uridae: northern flying squirrel, Glaucomys sabrinus, and Townsend's chipmunk,Tamias townsendii) in a
cross-sectional survey of controlled and naturalstandsin southwestern Oregon in the course of 1985-89.
We measured crops and abundances of squirrelsat >2,000 pointsin 19 stands in three seral stages.We defined the diets of the squirrels within the stands. We analyzed info at element, stand, and level scales to spot key procedures contributing to biodiversity and scales at which emergent homes (synergistic results) appeared.
Read or Download Ecological Scale and Forest Development: Squirrels, Dietary Fungi, and Vascular Plants in Managed and Unmanaged Forests PDF
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Additional resources for Ecological Scale and Forest Development: Squirrels, Dietary Fungi, and Vascular Plants in Managed and Unmanaged Forests
Example text
Diversity (GLSA) Glaucomys and Tamiastownsendii Oregon,spring1986and spring1988. (TATO)in3 seralstagesinsouthwestern ,,/,, Diversitymeasures and major components Taxa/stand x SE Universal taxaa Total number taxab Diversityc 1986 1988 Relative densities Fungal spores (%) Fungal hyphae (%) Plant materiald(%) Insects HHIII ,I I Old growth(n = 6) I Niche diversification (n = 3) I ~~~~~~~~~ . 6 73 0 26 1 Taxa occurringin >80% of the stands withina seral stage. b Rare taxa (<10% mean frequencyof occurrence): Agaricaceae, Chamonixia,Cortiinoiyces,Destuntzia, Genea, Genebea, Glomlus,Hydnotria, Hydnotryopsis,Modicella, Octaviaina,Pachyphloeus,Picoa, Peziza, Scleogaster,Scleroderna, Tuber,Weraroa, Cortinariaceae,Boletaceae, Coprinaceae, Endogone, and dematiaceous Hyphomycetes.
T Fo^ MONOGRAPHS t Fungal spores dominatedthe remainsof food items in fecal pellets forflyingsquirrels (72-82% relative density) and chipmunks (68-73% relativedensity)in spring (Tables 11, 12). 16). On average over seasons and stands, the relativedensity of plant material did not differbetween flyingsquirrels (median = 33%, range = 0-82%) and chipmunks(median = 33%, range = 1-58%). 01) when relative density averaged 18 ? 11% for flying squirrels and 26 ? 9% for chipmunks. Fungal hyphae and insects, overall, were minor components of pellets (1-3% relative density).
Disease outbreaks,small-scale fires,and windstorms)and rare catastrosquirrels,weasels, and spotted owls. The ecosystem strategyof homeostasis phes (large-scale windstorms,fires, and throughmaximumsupportof complexbio- volcanic eruptions). We illustratethe promass structureconflictswith human goals cesses involvedthroughdiscussionof each of maximizingproductionor yield of wood of the structuralfactorsderived fromour products (Odum 1969). Silviculture,how- data, the compositional factor,and finally ever, can be used either as a means of spatial heterogeneity.