Sound production and stridulatory organs of Dendroctonus ponderosae Hopkins : a comparison of populations from three pine hosts Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/4m90dz383

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  • Populations of Dendroctonus ponderosae Hopkins from three pine hosts, Pinus ponderosa Laws., P. contorta Dougl. and P. monticola Dougl., were sampled with regard to their acoustic signals, the morphology of their stridulatory apparatus and some aspects of their emergence behavior. Comparisons of these characteristics were made between samples from different hosts and/or years. Statistical comparisons were made of acoustic signals in four behavioral contexts: male attractant stridulation, male rivalry stridulation, male stress stridulation and female acoustic response to an intruder. Four parameters were considered: the number of spikes per chirp, the spike rate, the duration of the chirp and the number of subchirps per chirp. Differences, in both multivariate comparisons of all stridulation parameters simultaneously and in comparisons of individual parameters, existed between samples in all behavioral contexts except male attractant stridulation. On this basis, male attractant stridulation is ruled out as .? possible interpopulation isolating mechanism. Seven different morphological characters were measured: the length of the left elytron, the length of the elytral pars stridens, the number of ridges in the elytral pars stridens, the percentage of ridges in the posterior half of the elytral pars stridens, the distance between the spines of the male plectral processes, and the length and number of ridges of the female sternal pars stridens. Statistical comparisons of individual characters were made between samples and between males and females of the same sample. Where differences were significant, D. ponderosae from ponderosa pine were always larger than D. ponderosae from western white pine which were in turn always larger than D. ponderosae from lodgepole pine. In samples from all three hosts females were larger than males in the length of the left elytron and in the percentage of ridges in the posterior half of the elytral pars stridens but generally similar in the length and number of ridges in the elytral pars stridens. Several differences in emergence behavior existed between populations from white pine and populations from either ponderosa or lodgepole pine. White pine samples had a greater proportion of males emerging than ponderosa and lodgepole samples and the proportion of males emerging did not increase over the emergence period in white pine samples as it did in both ponderosa and lodgepole samples. Emergence of beetles from white pine was rhythmic and closely synchronous with temperature whereas emergence from ponderosa and lodgepole tended to be rhythmic but asynchronous with temperature.
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