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Forest encroachment has been documented across North America, from British Columbia to New Mexico, and is a growing concern due to loss of essential grassland habitat. Climate change, fire suppression, changes in grazing regimes, and differences in microclimate between topographic gradients are the main factors associated with forest encroachment into grasslands. Small-scale factors, such as competition and facilitation also play an important role in forest-grassland dynamics. I examined forest-grassland dynamics in southwest Yukon through dendroecological techniques and repeat image analysis. Dendroecological techniques were used to identify periods of tree encroachment, changes in age structure, pulses of tree establishment and possible correlations with climatic variables. Dendroecological results indicated that over the last 60-80 years, trees have invaded an average of 30 meters into grasslands on south-facing slopes and flat terrain in southwest Yukon. Ecotones on north-facing slopes appear stable with little advance into grasslands over the last 60 years. Results indicate forest encroachment varies across topography and between tree species. Repeat image analysis was also used to examine landscape changes over a 60-year time period near Kluane Lake. Forest encroachment was investigated using landscape metrics which characterized changes in grassland configuration across three time periods (1947, 1979, 2007) in a 10km2 area. Total grassland area decreased from 214.4 hectares in 1947 to 137 hectares in 2007 and coincided with extensive grassland fragmentation. One hundred and seventy grassland patches were identified in 1947 which increased to 270 patches in 2007. Although tree invasion was found across all topographic gradients, results complement dendroecological analyses with flat terrain and south-facing slopes experiencing the greatest loss of grassland. It is possible that the increase in trembling aspen (Populus tremuloides) on south-facing slopes and flat terrain is due to warmer temperatures in the area. Aspen establishment coincided with warmer temperatures however further work is needed to identify the influence of changes in fire and grazing regimes. Although southwest Yukon grasslands are limited in distribution they are ecologically significant and provide habitat for unique assemblages of flora and fauna. / Thesis (Master, Geography) -- Queen's University, 2012-09-18 01:03:21.524

Thesis (Ph. D.)--Auburn University. / Abstract. Vita. Includes bibliographical references (p. 153-170).

The Florida Everglades is considered as a vulnerable wetland composed primary of organic rich peat soils, experiencing saltwater intrusion. Impact of increasing salinity on the strength and deformation properties of peat is unknown. A laboratory study was undertaken to evaluate how the growing salinity level due to sea level rise may alter the compressibility behavior of the Everglades soils. Sixteen 1-dimensional oedometer tests were conducted on undisturbed Everglades peat soils in two phases. Phase I included samples from Site 1 (saltwater) and Site 3 (freshwater) without any salinity addition. Phase II consisted of soil from Site 3 (freshwater) saturated in six different levels of salinity artificially added to the samples. Compressibility properties investigated in this study include compression index (Cc), coefficient of consolidation (Cv), hydraulic conductivity (K), and the Ca/Cc ratio. In general, it was observed that the increase in salinity beyond a threshold value tends to increase the soil compressibility properties, indicating a possible reduction in soil stability with saltwater intrusion. / Includes bibliography. / Thesis (M.S.)--Florida Atlantic University, 2021. / FAU Electronic Theses and Dissertations Collection

Piñon and juniper encroachment and infilling can alter ecosystem processes and decrease resilience and resistance in sagebrush grasslands. Land managers employ a variety of techniques to eliminate these trees and mitigate their negative effects. Mechanical mastication or shredding is an increasingly popular method of removing these trees in Utah. It is a versatile treatment that can reduce canopy fuels, increase infiltration, and reduced sediment loss. We compared vegetation cover for annual and perennial vegetation functional groups on shredded and adjacent unshredded areas across a range of sites. Our approach was to categorize sites by ecological site type (encroachment or tree) and subplots by treatment (untreated, shredded, and shredded-seeded) and initial tree cover. Mixed model analysis of covariance and the Tukey-Kramer test were used to determine significant differences among ecological site type and treatment combinations for each 5% increment of untreated or initial tree cover. Shrub cover was unaffected by treatment and decreased with increasing tree cover. In general, perennial herbaceous understory cover increased after shredding to equal or exceed initial encroachment and infilling levels. This held true for both ecological site types and treatments, even at high pretreatment tree cover percentages. Cheatgrass also increased in cover after tree shredding although this trend was dampened in the seeded treatments indicating some suppression of cheatgrass by seeding. Shredding when there is high cover of perennial herbaceous plants and shrubs or seeding in conjunction with shredding where initial tree cover exceeds 35-40% will help discourage dominance by weeds.

Moral encroachment theses (MET) operate like pragmatic encroachment theses. When the stakes of belief are high, so are the standards for evidence. This means that evidence which is sufficient in a low stakes-of-belief scenario may be insufficient when the stakes are raised. Simply, METs aim to appeal to the varying moral intuitions that one may have in cases with different moral stakes and build an epistemological difference out of that moral distinction. For example, one might think that in cases of racial profiling, because the moral stakes of belief are high, what would otherwise constitute good evidence for belief is insufficient. However, most METs assume that the probabilistic evidence on which one relies to form their belief is good evidence. Instead of examining the reliability of statistical generalizations, like those used in cases of racial profiling, the moral encroacher focuses on the moral facts of the circumstance of belief formation to explain why the subsequent belief is wrong epistemically. I will focus on Sarah Moss's account because she focuses on cases in which one forms an opinion on the basis of probabilistic evidence. I use Moss's version of the MET as a target to illustrate the challenges METs face in general. Broadly, Moss holds that a judgment's moral risk bears on its epistemic status. In Section 1, I briefly outline Sarah Moss's MET and explain why it fails to identify which cases produce epistemically problematic judgments and fails to explain why those judgments are epistemically problematic. In Section 2, I offer an alternative account, which explains why statistical generalizations about marginalized social groups are likely unreliable as evidence. Thus, use of this kind of evidence leads to epistemically problematic beliefs. I conclude by introducing epistemic risk as an explanation for why the inference made in Shopper is epistemically problematic while the inference made in Fraternity Member is not. / Master of Arts / Imagine a shopkeeper who has just realized something was stolen from his shop. There are two possible suspects: a young white man and a young Black man. He did not see the shoplifting occur, and the only evidence he has is the statistical evidence that young Black men are 70% more likely to shoplift than young white men. By all accounts, he is not racially biased, this is simply a statistical fact that he is aware of. Based on this evidence, he forms the judgment that the young Black man is the likely culprit. Let's call this case Shopper. Now imagine a student on a college campus whose friend has been assaulted. There are two possible suspects: a young man who is not a fraternity member and a young man who is in a fraternity. The only evidence that the student has is the statistical evidence that men involved in fraternities are 70% more likely to have committed sexual violence than average. By all accounts she is not anti-fraternity, she is simply aware of this statistical evidence. Based on this evidence, she forms the judgment that the fraternity member is the likely assailant. Let's call this case Fraternity Member. I think there's a difference between these two cases. Specifically, I think it's okay to make the inference in the latter case, but not in the former. Even if you don't quite share my intuition, you might still think that however 'icky' it feels to draw the above sort of inference in Fraternity Member, it feels ickier still to draw it in Shopper. Either way, I don't think these intuitions are merely responsive to the moral facts of the cases: I think there's something different about the evidence relied upon in these cases. Specifically, we have reason to thinks that the processes with which we produce the evidence relied upon in Shopper are biased.

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Thesis (doctoral)--Delft University of Technology, Delft, The Netherlands. / Description based on print version record. Includes bibliographical references (p. [135]-144).

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International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada / In the past four years Congress has passed legislation mandating the reallocation of 255 MHz of radio frequency bands from Federal to non-Federal or “MIXED USE.” Several of the frequency bands supporting telemetering functions were affected, and more legislation of this nature is forecasted.