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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 of (A) planted species excluding the dominant grasses and (B) all planted forbs each year in the cultivar and local ecotype dominant grass treatments.
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fig04: Average (± standard error) aboveground net primary productivity of (A) planted species excluding the dominant grasses and (B) all planted forbs each year in the cultivar and local ecotype dominant grass treatments.

Mentions: Subordinate species (planted and volunteer combined) comprised 93%, 75%, 53%, and 57% of the total ANPP corresponding to the 1st through the 4th year of community establishment. To elucidate whether dominant grass source differentially affected the ANPP of restored subordinate species, we examined the ANPP of all planted species excluding the focal grasses by two refined classes: all other planted species and planted forbs. The ANPP of all other planted species was not affected by dominant grass source over all years (SOR: F[UN] 1, 28.8 < 0.1, P = 0.973) or within any year (SOR × YR: F[UN] 3, 28 = 0.5, P = 0.720) (Fig. 4A). Planted forb ANPP was also similar among the dominant grass sources over all years and within each year (SOR: F[CS] 1, 29 = 1.9, P = 0.185; SOR × YR: F[CS] 3, 90 = 1.7, P = 0.167) (Fig. 4B).


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 of (A) planted species excluding the dominant grasses and (B) all planted forbs each year in the cultivar and local ecotype dominant grass treatments.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig04: Average (± standard error) aboveground net primary productivity of (A) planted species excluding the dominant grasses and (B) all planted forbs each year in the cultivar and local ecotype dominant grass treatments.
Mentions: Subordinate species (planted and volunteer combined) comprised 93%, 75%, 53%, and 57% of the total ANPP corresponding to the 1st through the 4th year of community establishment. To elucidate whether dominant grass source differentially affected the ANPP of restored subordinate species, we examined the ANPP of all planted species excluding the focal grasses by two refined classes: all other planted species and planted forbs. The ANPP of all other planted species was not affected by dominant grass source over all years (SOR: F[UN] 1, 28.8 < 0.1, P = 0.973) or within any year (SOR × YR: F[UN] 3, 28 = 0.5, P = 0.720) (Fig. 4A). Planted forb ANPP was also similar among the dominant grass sources over all years and within each year (SOR: F[CS] 1, 29 = 1.9, P = 0.185; SOR × YR: F[CS] 3, 90 = 1.7, P = 0.167) (Fig. 4B).

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