10.5061/DRYAD.B8D60
Morrison, Keenan R.
University of Hawaii at Hilo
Stacy, Elizabeth A.
University of Hawaii at Hilo
Data from: Intraspecific divergence and evolution of a life-history
trade-off along a successional gradient in Hawaii’s Metrosideros
polymorpha
Dryad
dataset
2014
Metrosideros polymorpha
2014-04-03T17:44:43Z
2014-04-03T17:44:43Z
en
https://doi.org/10.1111/jeb.12393
144532 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
The importance of environmental gradients in the diversification of
long-lived tree species is poorly understood. Two morphologically distinct
varieties of the endemic Hawaiian tree, 'ōhi'a lehua
(Metrosideros polymorpha), are the canopy dominants at alternate extremes
of a successional gradient formed by the recurring disturbance of lava
flows on east Hawai'i Island. The maintenance of these varieties
despite hybridization may be due to disruptive selection at either end of
the successional gradient. To test this hypothesis, seeds from three,
replicate monotypic stands of each variety on east Hawai'i Island
were germinated and the resulting seedlings grown under four combinations
of light and nitrogen levels in a greenhouse, and at early- and
late-successional field sites. Growth and survivorship measures revealed
differential fitness of these varieties in high- and low-light
environments in the greenhouse with corresponding differential fitness in
early- and late-successional field sites. Unique light-by-nitrogen
interaction effects on growth were observed in each variety, and only the
late-successional variety appeared to be nitrogen limited. These two
varieties exhibit the classic plant life-history trade-off between fast
growth in high light and high survivorship in shade, but notably within a
single tree species. These findings strongly implicate a role for
Hawaii's striking environmental heterogeneity in the emergence of at
least two endemic forms of this woody genus.
Raw Data MastersheetMastersheet of all raw data for greenhouse, field,
germination, and fluorometer studies on separate excel sheets. A key to
all data labels is also added on the fifth sheet.Master.xlsx
Hawai'i