Seed Production in Sideoats Grama Populations with Different Grazing Histories

Smith, Steven E.; Mosher, Rebecca A.; Fendenheim, D. M.

doi:10.2307/4003657

Cited by 13 publications

(12 citation statements)

References 27 publications

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“…al 1994, Quesada et. al 1995, Lehtila and Strauss 1997, Herrera 2000, Juenger and Bergelson 2000, Mothershead and Marquis 2000, Smith et al 2000, Van Der Wal et al 2000. This wealth of evidence that herbivory does affect ecological traits that are expected to impact the distribution of neutral genetic variation leads us to favor a second explanation for our observation that grazing has not affected genetic variation in Idaho fescue at NGBER.…”

Section: Discussionmentioning

confidence: 91%

Long-term grazing effects on genetic variation in Idaho fescue

Matlaga

Karoly

2004

Rangeland Ecology & Management

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The effect of cattle grazing on the genetic structure of native grass populations has received little attention. We investigated the effect of cattle grazing on genetic variation in Idaho fescue (Festuca idahoensis Elmer) using ISSR (inter-simple sequence repeat) DNA markers. The ISSR markers are hypervariable and are generally interpreted as being selectively neutral. Idaho fescue tillers were sampled from inside (N = 31) and outside (N = 34) a 64-year-old cattle exclosure in southeastern Oregon. We extracted DNA and used 2 ISSR primers to determine the genotypes for grazed and ungrazed plants at 60 variable loci. No statistically significant differences were observed between grazed and ungrazed samples for percent polymorphic loci (grazed = 85 %; ungrazed = 80 %), mean expected heterozygosity (grazed = 0.1393; ungrazed = 0.1365), or for a measure of loci dissimilarity

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Section: Discussionmentioning

confidence: 91%

Long-term grazing effects on genetic variation in Idaho fescue

Matlaga

Karoly

2004

Rangeland Ecology & Management

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“…Seed production of the aboveground vegetation, an important source for the soil seed bank, was strongly related to the variation in soil seed bank characteristics [ 47 , 48 ], and it is likely that implemented management regimes directly affect species composition of the vegetation more dramatically than the seed bank [ 49 ]. In this study, the reproduction of the target species L .…”

Section: Discussionmentioning

confidence: 99%

“…chinensis was clearly inhibited by the mowing behavior and few spikelets were found in the Mown habitats. Seed production was reduced after mowing due to the lower numbers of tillers and inflorescences per plant, spikelets per inflorescence, and seed quantity per spikelet [ 47 ]. In contrast, the Transplant treatment promoted both the vegetative and reproductive growth of L .…”

Section: Discussionmentioning

confidence: 99%

Effects of 10-Year Management Regimes on the Soil Seed Bank in Saline-Alkaline Grassland

Yang

Liang

et al. 2015

PLoS ONE

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BackgroundManagement regimes for vegetation restoration of degraded grasslands can significantly affect the process of ecological succession. However, few studies have focused on variation in the soil seed bank during vegetation restoration under different management regimes, especially in saline-alkaline grassland habitats. Our aim was to provide insights into the ecological effects of grassland management regimes on soil seed bank composition and vegetation establishment in mown, fenced, transplanted and natural grassland sites, all dominated by the perennial rhizomatous grass Leymus chinensis.MethodologyWe studied species composition and diversity in both the soil seed bank and aboveground vegetation in differently managed grasslands in Northeast China. An NMDS (nonmetric multidimensional scaling) was used to evaluate the relationship between species composition, soil seed banks, aboveground vegetation and soil properties.Principal FindingsFenced and mown grassland sites had high density and species richness in both the soil seed bank and aboveground vegetation. The Transplanted treatment exhibited the highest vegetation growth and seed production of the target species L. chinensis. Seeds of L. chinensis in the soil occurred only in transplanted and natural grassland. Based on the NMDS analysis, the number of species in both the soil seed bank and aboveground vegetation were significantly related to soil Na+, Cl-, RSC (residual sodium carbonate), alkalinity, ESP (exchangeable sodium percentage) and AP (available phosphorus).ConclusionsSoil seed bank composition and diversity in the saline-alkaline grassland were significantly affected by the management regimes implemented, and were also significantly related to the aboveground vegetation and several soil properties. Based on vegetative growth, reproductive output and maintenance of soil seed bank, the transplanting was identified as the most effective method for relatively rapid restoration of the target species L. chinensis. This approach could be beneficial for the restoration of dominant species in a wide range of degraded grassland ecosystems.

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“…Livestock grazing may represent a major factor shaping ecosystem composition, structure, and function at multiple scales (Milchunas and Lauenroth 1993;Milchunas et al 1998;Asner et al 2004;Sivakumar et al 2005). At the population level, numerous changes have been documented in grazingresistance traits within plant populations in species that persist in the presence of livestock (e.g., Carman and Briske 1985;Poley and Detling 1990;Briske and Anderson 1992;Briske and Richards 1995;Smith 1998;Smith et al 2000;Díaz et al 2001;Arredondo et al 2005). In some cases, these changes in functional traits have also been associated with changes in genetic variation (Smith 1998;Noy-Meir and Briske 2002).…”

Section: Introductionmentioning

confidence: 99%

Fine-Scale Spatial Genetic Structure in Perennial Grasses in Three Environments

Smith

Arredondo

Aguiar

et al. 2009

Rangeland Ecology & Management

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Past research has shown that changes in grazing-resistance traits may be associated with genetic changes in plant populations. Little is known about spatial genetic relationships within plant populations (spatial genetic structure) and any grazing effects on these relationships. Here we present observations of the fine-scale spatial genetic structure in three grass species in semiarid environments (Arizona, Mexico, and Argentina). In each environment, populations of a dominant grass species were sampled from two sites with contrasting livestock grazing histories. Plant genotypes were described with the use of amplified fragment length polymorphism markers. In Arizona, populations of sideoats grama (Bouteloua curtipendula var. caespitosa Gould and Kapadia) differed in that one has never experienced livestock grazing, whereas cattle have grazed the other. In the other two environments, populations exposed to long-term heavy grazing were examined, along with those that experienced either moderate grazing (Mexico, blue grama [Bouteloua gracilis {Willd. ex Kunt} Lag. ex Griffiths]) or extended exclusion of livestock (Argentina [Poa ligularis Nees ex Steud.]). Based on independent analysis of each population, we observed no differences in average gene diversity between populations of each species. With the use of analysis of molecular variance we found slight but significant genetic differentiation between populations with different grazing histories in Arizona and Argentina. Significant genetic structure was present in all populations and indicated an inverse relationship between spatial and genetic distance. Interestingly, this relationship was most pronounced in the cattle-free sideoats grama population, suggesting larger genetic neighborhood areas in the absence of livestock. Less distinct differences in spatial genetic structure associated with grazing history were evident in the other two species. We hypothesize that livestock grazing may lead to increased homogeneity in genetic structure at the landscape scale. Effectively examining this hypothesis presents many experimental challenges.

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Seed Production in Sideoats Grama Populations with Different Grazing Histories

Cited by 13 publications

References 27 publications

Long-term grazing effects on genetic variation in Idaho fescue

Long-term grazing effects on genetic variation in Idaho fescue

Effects of 10-Year Management Regimes on the Soil Seed Bank in Saline-Alkaline Grassland

Fine-Scale Spatial Genetic Structure in Perennial Grasses in Three Environments

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