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Life Sciences Commons

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Series

1979

Stephen F. Austin State University

Articles 1 - 2 of 2

Full-Text Articles in Life Sciences

Characterizing Flight Aggregation Of The Southern Pine Beetle, Jack E. Coster, Paul C. Johnson Jan 1979

Characterizing Flight Aggregation Of The Southern Pine Beetle, Jack E. Coster, Paul C. Johnson

Faculty Publications

Spatial aggregation patterns of flying southern pine beetles, Dendroctonus frontalis Zimm., were studied using a systematic grid of sticky flight traps placed in 3 beetle infestations. Five methods of characterizing dispersion were compared: Lloyd's index of patchiness (IP), Morisita's index of dispersion (15), the coefficient of dispersion (CD), the slope of

Taylor's power function (b) and the slope of Iwao's regression of mean crowding on mean density (m). All indices indicated a high degree of aggregation of flying southern pine beetles within the infestations. The indices varied, however, in their ranking of aggregation for the 3 study sites. IP and …


Effects Of Prescribing Burn On Cavity Trees Of Red-Cockaded Woodpeckers, Richard N. Conner, Ann Snow Jan 1979

Effects Of Prescribing Burn On Cavity Trees Of Red-Cockaded Woodpeckers, Richard N. Conner, Ann Snow

Faculty Publications

No abstract provided.