Graduate Thesis Or Dissertation
 

Population dynamics of the cinnabar moth, Tyria jacobaeae (Lepidoptera: Arctiidae)

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  • The dynamics of a field population of the cinnabar moth, Tyria jacobaeae L., were studied near Jordan, Linn County, Oregon. In both 1970 and 1971 larval populations were so large that all foliage of the host weed, tansy ragwort, Senecio jacobaea L., was consumed. The ensuing starvation accounted for the majority of identified mortality. A model, constructed to describe larval food consumption through time, stated that the food required to support the 1971 population through completion of development was nearly three times that available. Other identified mortality factors included predation on adults by chipmunks and on larvae by spiders. A condensed history of the introduction of the cinnabar moth is presented.
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  • File scanned at 300 ppi (Monochrome, 256 Grayscale) using Capture Perfect 3.0 on a Canon DR-9050C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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