The aim of this report was to investigate if the number and distribution of sea holly (Eryngium maritimum) on the island of Gotska Sandön in the Baltic sea north of Gotland have, and to explore if there is a link between change in plant habitat and change in number of sea holly individuals on the island. To do so a plant inventory was made in 2021 and compared to a previous inventory that was done in 2009. The number of individuals was counted and the habitat which they grey in was noted. Moreover, the presence of japanese rose (Rosa rugosa), and the expansion of scots pine (Pinus sylvestris) was also noted in each locality where sea holly was found. The number of individuals of sea holly on Gotska Sandön went from 9353 in 2009 to 8310 in 2021, mainly becuase of fewer individuals in the largest locality of sea holly on the island. This is probably due to an increase in the proportion of individuals growing on the wooded dunes compared to 2009 and an expansion of japanese rose in the locality. The localities where no scots pine or japanese rose grew in the grey- and white dunes the individuals of sea holly stayed the same or increased in numbers. Despite this, no link could be found between the change in sea holly individual numbers and what plan habitat they grew on Gotska Sandön 2021.

京都大学 / 新制・課程博士 / 博士(農学) / 甲第23942号 / 農博第2491号 / 新制||農||1090(附属図書館) / 学位論文||R4||N5377(農学部図書室) / 京都大学大学院農学研究科森林科学専攻 / (主査)教授 神﨑 護, 教授 北島 薫, 教授 市岡 孝朗 / 学位規則第4条第1項該当 / Doctor of Agricultural Science / Kyoto University / DGAM

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