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Population Structure of the Recently Rediscovered Hawaiian Shrub Tetramolopium arenarium (Asteraceae)

Richard D. Laven, Robert B. Shaw, Patricia P. Douglas and Victor E. Diersing
Annals of the Missouri Botanical Garden
Vol. 78, No. 4 (1991), pp. 1073-1080
DOI: 10.2307/2399744
Stable URL: http://www.jstor.org/stable/2399744
Page Count: 8
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Population Structure of the Recently Rediscovered Hawaiian Shrub Tetramolopium arenarium (Asteraceae)
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Abstract

A demographic monitoring study was initiated in the sole known population of Tetramolopium arenarium, a taxon that was considered extinct until recently rediscovered on the Pohakuloa Training Area, Island of Hawaii, Hawaii. Spatial distribution, size structures, life history stage structure and reproductive output were determined for the population. This sole population is restricted to a 100 m by 300 m area along a mesic ridge system and is comprised of 134 individuals. Size class frequency distributions are bell-shaped with the population dominated by large individuals. In spite of large flower and seed production, interpretation of these distributions reveals that this species is either on the verge of extinction or that episodic establishment is necessary to ensure the long-term persistence of this rare taxon. In order to safeguard this species, we recommend that military operations and hunting activity be restricted and that the area be fenced to exclude feral animals.

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