Graduate Project
 

Understanding invasive conifer seed structure and viability to inform treatment efforts

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https://ir.library.oregonstate.edu/concern/graduate_projects/hm50v1055

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  • This paper examines the invasion of exotic wilding conifers on the native tussock grasslands of Aotearoa New Zealand. The investigation includes two studies and aims to better understand the structure of Pinus contorta seeds across tree crown positions and the viability rates of P. contorta seeds produced during a trees first flush of cones. The methodology for collecting and analyzing seed weight and size as well as wing size for the seed structure study is described, including the use of an image segmenting artificial intelligence tool. The process of chemically testing the viability of seed and analyzing the collected data is also detailed. Results indicate that the mass and area of P. contorta seeds have an inverse relationship with tree crown height, though wing-loading remains roughly uniform throughout the tree crown. P. contorta seed viability rates were found to be highly site dependent, yet still show that viable seed is produced in a tree’s first coning. While seed structure does vary across crown heights, it may not be a primary driver of P. contorta invasion and more research on the subject is warranted. However, the invasiveness of P. contorta is highlighted through finding viability among first-round seed production, ruling out the option of delaying treatment without any impacts on spread.
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file details VautrinAndy2024.pdf 2024-03-20 Público Descargar