Johnson, Loretta C.;
Olsen, Jacob T.;
Tetreault, Hannah;
DeLaCruz, Angel;
Bryant, Johnny;
Morgan, Theodore J.;
Knapp, Mary;
Bello, Nora M.;
Baer, Sara G.;
Maricle, Brian R.
Intraspecific variation of a dominant grass and local adaptation in reciprocal garden communities along aUSGreat Plains' precipitation gradient: implications for grassland restoration with climate change
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Medientyp:
E-Artikel
Titel:
Intraspecific variation of a dominant grass and local adaptation in reciprocal garden communities along aUSGreat Plains' precipitation gradient: implications for grassland restoration with climate change
Beteiligte:
Johnson, Loretta C.;
Olsen, Jacob T.;
Tetreault, Hannah;
DeLaCruz, Angel;
Bryant, Johnny;
Morgan, Theodore J.;
Knapp, Mary;
Bello, Nora M.;
Baer, Sara G.;
Maricle, Brian R.
Erschienen:
Wiley, 2015
Erschienen in:
Evolutionary Applications, 8 (2015) 7, Seite 705-723
Sprache:
Englisch
DOI:
10.1111/eva.12281
ISSN:
1752-4571
Entstehung:
Anmerkungen:
Beschreibung:
AbstractIdentifying suitable genetic stock for restoration often employs a ‘best guess’ approach. Without adaptive variation studies, restoration may be misguided. We test the extent to which climate in centralUSgrasslands exerts selection pressure on a foundation grass big bluestem (Andropogon gerardii), widely used in restorations, and resulting in local adaptation. We seeded three regional ecotypes ofA. gerardiiin reciprocal transplant garden communities across 1150 km precipitation gradient. We measured ecological responses over several timescales (instantaneous gas exchange, medium‐term chlorophyll absorbance, and long‐term responses of establishment and cover) in response to climate and biotic factors and tested if ecotypes could expand range. The ecotype from the driest region exhibited greatest cover under low rainfall, suggesting local adaptation under abiotic stress. Unexpectedly, no evidence for cover differences between ecotypes exists at mesic sites where establishment and cover of all ecotypes were low, perhaps due to strong biotic pressures. Expression of adaptive differences is strongly environment specific. Given observed adaptive variation, the most conservative restoration strategy would be to plant the local ecotype, especially in drier locations. With superior performance of the most xeric ecotype under dry conditions and predicted drought, this ecotype may migrate eastward, naturally or with assistance in restorations.