Structure of Isolated Populations of Populus tremuloides (Quaking Aspen) in the Davis Mountains of Far-West Texas

Auken, O. W. Van; Bush, J. K.; Richter, Falk; Karges, John P.

doi:10.3375/0885-8608(2007)27[302:soipop]2.0.co;2

Cited by 4 publications

(18 citation statements)

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“…The stature and composition of these isolated Davis Mountains P. tremuloides stands has changed over recent years and will continue to change in the future since P. tremuloides is a successional species [6]. Prediction of changes will be difficult and concerns for the decline of P. tremuloides stands, including those in the Davis Mountains, do exist and are not new [6] [64]- [71].…”

Section: Discussionmentioning

confidence: 99%

“…Although light levels were reduced under existing P. tremuloides canopies in the Davis Mountains when we examined them, regeneration was still occurring. There was a high density of P. tremuloides juveniles under the canopy, especially in the younger stands [6]. This provided some indication that light level may not be the only factor limiting recruitment into the adult population in these relatively small and open stands.…”

mentioning

confidence: 86%

“…slope = 29.8˚) on Mount Livermore, nearby Pine Peak, and in Cherry Canyon (Figure 1(b), from [37]). Ecological data was previously collected from these P. tremuloides stands [6] and is summarized here (Table 1). Actual or estimated P. tremuloides relative tree density was 27% -92% (low in a few cases because of other species), relative basal area was 48% -96% (4.1 to 23.0 m 2 /ha) and juvenile density was 32 -14,000 stems/ha (Table 1).…”

Section: Study Areamentioning

confidence: 99%

“…As the climate warmed, P. tremuloides is thought to have migrated north in range and to higher elevations. Isolated "mountain islands" of aspen have recently been described in western Texas [5] [6]. Could all of the isolated, present day stands of P. tremuloides in the Davis Mountains have been part of a mega population, which are now disconnected [7] [8]?…”

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confidence: 99%

“…A considerable amount is known about the biology and ecology of P. tremuloides, for example it is an early successional species, and it forms clones with shallow and fairly widespread roots with considerable vegetative sprouting [18] [19]. Fire seems to play an important role in the regeneration of P. tremuloides communities [6] since it is a successional species and as a result its presence in a given physical area will increase and decrease through time. Fires were fairly frequent in the Davis Mountains from approximately 1772 until about 1926 [20].…”

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Outlier Stands of Quaking Aspen in the Davis Mountains of West Texas: Clone or Clones?

Nunneley¹,

Auken²,

Karges³

2014

AJPS

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Populus tremuloides (quaking aspen) is found from the Pacific to the Atlantic Ocean in the northern United States and Canada, and at higher elevations in the western United States and northern Mexico. While P. tremuloides can reproduce sexually or asexually, it is primarily a clonal species in the intermountain west, reproducing vegetatively via root sprouts, yielding genetically identical stems or ramets. In west Texas, isolated, outlier stands occur in the Guadalupe, Davis, and Chisos Mountains at an elevation of approximately 2300 m. This study utilized seven microsatellites or simple sequence repeats (SSRs) to examine leaf samples from 10 widely separated stems in 10 isolated P. tremuloides individual stands within the Davis Mountains to determine the level of clonal and genetic diversity. We then examined differentiation among stands. Each stem sampled within a stand was genetically identical to all stems examined in that stand or was part of a clone. There were eight genetically identical clones from these ten stands, with three stands being genetically identical or part of the same clone. Many of the genotypes shared several of the same alleles and the remaining alleles were only a few base pairs apart. Some of these alleles have been previously identified in other western North American P. tremuloides stands. Microsatellites identified several triploid patterns consistent with possible aneuploidy, which is concurrent with previous studies.

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Section: Discussionmentioning

confidence: 99%

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confidence: 86%

Section: Study Areamentioning

confidence: 99%

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confidence: 99%

mentioning

confidence: 99%

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Outlier Stands of Quaking Aspen in the Davis Mountains of West Texas: Clone or Clones?

Nunneley¹,

Auken²,

Karges³

2014

AJPS

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Lack of woody species recruitment in isolated deep canyon deciduous woodlands in central Texas, USA1

Van Auken,

Bush,

Taylor

et al. 2023

The Journal of the Torrey Botanical Society

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The area surveyed is part of the Edwards Plateau physiographic region in central Texas. It is mostly private property and includes isolated riparian and nonriparian deciduous woodlands. We searched for isolated deciduous woodland communities using satellite imagery and drone flights. Deciduous communities found were in deep canyons but not in riparian communities with physical positions similar to some isolated forests present in the southern Appalachian Mountains in North America. Eight communities were selected for ground surveys and had 16 overstory and 30 understory woody species. Surrounding the deciduous communities were Juniperus-Quercus woodlands (juniper-oak). Acer grandidentatum (Aceraceae, bigtooth maple) overstory density was 169 6 73 plants/ ha (mean 6 SD) and basal area was 9.6 6 4.7 m 2 /ha, or 43% relative basal area. Quercus muehlenbergii (Fagaceae, chinkapin oak) and Quercus laceyi (Lacey oak) had the second and third highest basal areas at 6.1 6 6.1 and 4.4 6 7.4 m 2 /ha, or 25% and 18% relative basal area. Size-class distributions were examined to determine recruitment. Distributions had many juveniles, few to no saplings, and a few larger trees. Weibull comparisons suggested little or no replacement of adults of the mature deciduous community species. There was a bottleneck with few or no saplings entering the adult population. Recruitment could be highly episodic depending on fire or drought, but browsing pressure by Odocoileus virginianus (white-tailed deer) seems to be the primary cause of lack of recruitment. Lack of recruitment would mean a loss of species and possibly all of these rare deciduous communities in the future.

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Light Levels and Herbivory Partially Explain the Survival, Growth, and Niche Requirements ofStreptanthus bracteatusA. Gray (Bracted Twistflower, Brassicaceae), a Rare Central Texas Endemic

Leonard

Auken

2013

Natural Areas Journal

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Structure of Isolated Populations of Populus tremuloides (Quaking Aspen) in the Davis Mountains of Far-West Texas

Cited by 4 publications

References 57 publications

Outlier Stands of Quaking Aspen in the Davis Mountains of West Texas: Clone or Clones?

Outlier Stands of Quaking Aspen in the Davis Mountains of West Texas: Clone or Clones?

Lack of woody species recruitment in isolated deep canyon deciduous woodlands in central Texas, USA1

Light Levels and Herbivory Partially Explain the Survival, Growth, and Niche Requirements ofStreptanthus bracteatusA. Gray (Bracted Twistflower, Brassicaceae), a Rare Central Texas Endemic

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