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No effect of seed source on multiple aspects of ecosystem functioning during ecological restoration: cultivars compared to local ecotypes of dominant grasses.

Baer SG, Gibson DJ, Gustafson DJ, Benscoter AM, Reed LK, Campbell RE, Klopf RP, Willand JE, Wodika BR - Evol Appl (2013)

Bottom Line: The cultivar of the increasingly dominant grass, Sorghastrum nutans, was genetically different than the local ecotype, but genetic diversity was similar between the two sources.Subordinate species comprised over half the aboveground productivity, which may have diluted the potential for documented trait differences between the grass sources to influence ecosystem processes.Regionally developed cultivars may be a suitable alternative to local ecotypes for restoration in fragmented landscapes with limited gene flow between natural and restored prairie and negligible recruitment by seed.

View Article: PubMed Central - PubMed

Affiliation: Department of Plant Biology and Center for Ecology, Southern Illinois University Carbondale, IL, USA.

ABSTRACT
Genetic principles underlie recommendations to use local seed, but a paucity of information exists on the genetic distinction and ecological consequences of using different seed sources in restorations. We established a field experiment to test whether cultivars and local ecotypes of dominant prairie grasses were genetically distinct and differentially influenced ecosystem functioning. Whole plots were assigned to cultivar and local ecotype grass sources. Three subplots within each whole plot were seeded to unique pools of subordinate species. The cultivar of the increasingly dominant grass, Sorghastrum nutans, was genetically different than the local ecotype, but genetic diversity was similar between the two sources. There were no differences in aboveground net primary production, soil carbon accrual, and net nitrogen mineralization rate in soil between the grass sources. Comparable productivity of the grass sources among the species pools for four years shows functional equivalence in terms of biomass production. Subordinate species comprised over half the aboveground productivity, which may have diluted the potential for documented trait differences between the grass sources to influence ecosystem processes. Regionally developed cultivars may be a suitable alternative to local ecotypes for restoration in fragmented landscapes with limited gene flow between natural and restored prairie and negligible recruitment by seed.

No MeSH data available.


Related in: MedlinePlus

Average (± standard error) aboveground net primary productivity (ANPP) of cultivar and local ecotype sources of (A) all focal grasses, (B) Sorghastrum nutans, (C) Andropogon gerardii, and (D) Schizachyrium scoparium in each restoration year. Inset graphs present significant main effects of time if there was no interaction between dominant grass source and species pool. Means accompanied by the same letter were not significantly different (α = 0.025).
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fig02: Average (± standard error) aboveground net primary productivity (ANPP) of cultivar and local ecotype sources of (A) all focal grasses, (B) Sorghastrum nutans, (C) Andropogon gerardii, and (D) Schizachyrium scoparium in each restoration year. Inset graphs present significant main effects of time if there was no interaction between dominant grass source and species pool. Means accompanied by the same letter were not significantly different (α = 0.025).

Mentions: Collectively, the focal C4 grasses (A. gerardii + S. nutans + S. scoparium) accounted for 36%, 50%, 64%, and 61% of total ANPP of planted species over time and increased significantly each year (YR: F[UN] 3, 28 = 15.2, P < 0.001) (Fig. 2A, inset graph). Focal C4 grass ANPP was similar between the grass sources over all species pools and years (SOR: F[UN] 1, 29.2 = 0.9, P = 0.354), between sources each year (SOR × YR: F[UN] 3, 28 = 0.6, P = 0.607) (Fig. 2A), and within each species pool over all years (SOR × SPP: F[UN] 2, 29.2 < 0.1, P = 0.972) (Table 2).


No effect of seed source on multiple aspects of ecosystem functioning during ecological restoration: cultivars compared to local ecotypes of dominant grasses.

Baer SG, Gibson DJ, Gustafson DJ, Benscoter AM, Reed LK, Campbell RE, Klopf RP, Willand JE, Wodika BR - Evol Appl (2013)

Average (± standard error) aboveground net primary productivity (ANPP) of cultivar and local ecotype sources of (A) all focal grasses, (B) Sorghastrum nutans, (C) Andropogon gerardii, and (D) Schizachyrium scoparium in each restoration year. Inset graphs present significant main effects of time if there was no interaction between dominant grass source and species pool. Means accompanied by the same letter were not significantly different (α = 0.025).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3927892&req=5

fig02: Average (± standard error) aboveground net primary productivity (ANPP) of cultivar and local ecotype sources of (A) all focal grasses, (B) Sorghastrum nutans, (C) Andropogon gerardii, and (D) Schizachyrium scoparium in each restoration year. Inset graphs present significant main effects of time if there was no interaction between dominant grass source and species pool. Means accompanied by the same letter were not significantly different (α = 0.025).
Mentions: Collectively, the focal C4 grasses (A. gerardii + S. nutans + S. scoparium) accounted for 36%, 50%, 64%, and 61% of total ANPP of planted species over time and increased significantly each year (YR: F[UN] 3, 28 = 15.2, P < 0.001) (Fig. 2A, inset graph). Focal C4 grass ANPP was similar between the grass sources over all species pools and years (SOR: F[UN] 1, 29.2 = 0.9, P = 0.354), between sources each year (SOR × YR: F[UN] 3, 28 = 0.6, P = 0.607) (Fig. 2A), and within each species pool over all years (SOR × SPP: F[UN] 2, 29.2 < 0.1, P = 0.972) (Table 2).

Bottom Line: The cultivar of the increasingly dominant grass, Sorghastrum nutans, was genetically different than the local ecotype, but genetic diversity was similar between the two sources.Subordinate species comprised over half the aboveground productivity, which may have diluted the potential for documented trait differences between the grass sources to influence ecosystem processes.Regionally developed cultivars may be a suitable alternative to local ecotypes for restoration in fragmented landscapes with limited gene flow between natural and restored prairie and negligible recruitment by seed.

View Article: PubMed Central - PubMed

Affiliation: Department of Plant Biology and Center for Ecology, Southern Illinois University Carbondale, IL, USA.

ABSTRACT
Genetic principles underlie recommendations to use local seed, but a paucity of information exists on the genetic distinction and ecological consequences of using different seed sources in restorations. We established a field experiment to test whether cultivars and local ecotypes of dominant prairie grasses were genetically distinct and differentially influenced ecosystem functioning. Whole plots were assigned to cultivar and local ecotype grass sources. Three subplots within each whole plot were seeded to unique pools of subordinate species. The cultivar of the increasingly dominant grass, Sorghastrum nutans, was genetically different than the local ecotype, but genetic diversity was similar between the two sources. There were no differences in aboveground net primary production, soil carbon accrual, and net nitrogen mineralization rate in soil between the grass sources. Comparable productivity of the grass sources among the species pools for four years shows functional equivalence in terms of biomass production. Subordinate species comprised over half the aboveground productivity, which may have diluted the potential for documented trait differences between the grass sources to influence ecosystem processes. Regionally developed cultivars may be a suitable alternative to local ecotypes for restoration in fragmented landscapes with limited gene flow between natural and restored prairie and negligible recruitment by seed.

No MeSH data available.


Related in: MedlinePlus