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Full-Text Articles in Life Sciences

Conservation Insights For Endemic Alpine Plants (Nabalus Spp.) Facing Global Environmental Change, Kristen Haynes Dec 2019

Conservation Insights For Endemic Alpine Plants (Nabalus Spp.) Facing Global Environmental Change, Kristen Haynes

Dissertations and Theses

Amid the current global biodiversity crisis spurred by anthropogenic environmental changes, determining conservation priorities and the extinction vulnerability of rare taxa are tasks of critical importance. Organisms can avoid environmental change-induced extinction through three possible response modes: evolutionary adaptation, migration (range shift), and tolerance through phenotypic plasticity. In this dissertation, I leveraged transplant experiments and population genomics to assess the ability of rare alpine rattlesnake-roots (Nabalus spp.) to adapt, migrate, and/or tolerate environmental change. I also employed these same techniques to define conservation units and priorities within two endemic alpine taxa (Nabalus boottii and Nabalus trifoliolatus var. nanus) and ...


Fine-Scale Microclimatic Controls On Soil Carbon Dioxide Fluxes In A Northern Hardwood Forest, Will Saunders May 2019

Fine-Scale Microclimatic Controls On Soil Carbon Dioxide Fluxes In A Northern Hardwood Forest, Will Saunders

Dissertations and Theses

Carbon dioxide (CO2) emissions from soil are typically the largest carbon flux from forest ecosystems to the atmosphere, representing a significant biogenic source of greenhouse gases. Although the temperature and moisture sensitivities of the respiration processes underlying soil CO2 fluxes are well studied, the impacts of a changing climate on these abiotic controls and the resulting soil flux responses are unresolved. Using in-situ continuous measurements of soil microclimate at sites with contrasting hydrology, this study assessed the temperature and moisture dependence of soil CO2 fluxes within hardwood forests of the Adirondack Mountains in northern New York State (USA). During the ...


Growth Dynamics Of Black Spruce (Picea Mariana) Across Northwestern North America, Anastasia E. Sniderhan Jan 2018

Growth Dynamics Of Black Spruce (Picea Mariana) Across Northwestern North America, Anastasia E. Sniderhan

Theses and Dissertations (Comprehensive)

The impacts of climate change have been widely documented around the world. One of the most rapidly changing areas is the boreal forest of North America. The extent of change has been such that there have been shifts in long-standing climate-growth relationships in many boreal tree species; while the growth of many of these high-latitude forests were formerly limited by temperature, warming has increased the evapotranspirative demands such that there is widespread drought stress limiting productivity in the boreal forest. With the importance of the boreal forest as a global carbon sink, it is imperative to understand the extent of ...


Drivers Of Post-Fire Vascular Plant Regeneration In The Conifer-Dominated Boreal Forest Of Southern Northwest Territories, Alison White Jan 2018

Drivers Of Post-Fire Vascular Plant Regeneration In The Conifer-Dominated Boreal Forest Of Southern Northwest Territories, Alison White

Theses and Dissertations (Comprehensive)

In recent years, climate warming has led to an increase in the severity and frequency of naturally occurring fires in boreal ecosystems globally. In 2014, an unprecedented 3.4 million hectares of boreal forest burned in the Northwest Territories (NWT). While much research has focused on post-fire succession of serotinous tree species such as Picea mariana (black spruce) and Pinus banksiana (jack pine), the understory community of vascular plants play an important role in ecosystem functioning but less is known about the response of this component of the system to changing fire regimes. Regeneration strategies such as the ability to ...


Elevated Temperature And Co2 Concentrations Affect Carbon Flux In Two Boreal Conifers, Sasha Madhavji Sep 2017

Elevated Temperature And Co2 Concentrations Affect Carbon Flux In Two Boreal Conifers, Sasha Madhavji

Electronic Thesis and Dissertation Repository

Elevated temperatures and CO2 will alter carbon flux in two dominant boreal tree species Picea mariana (black spruce) and Larix laricina (tamarack). Trees were grown in three temperature treatments (ambient, ambient +4 °C, and ambient +8 °C) at either 400 ppm or 750 ppm CO2, to simulate climate conditions between now and the year 2100. Spruce acclimated to increasing temperature detractively; warming scenarios reduced spruce net carbon gain. Tamarack maintained comparable levels of net photosynthesis (Anet) across warming treatments and both species acclimated respiration (Rdark) with increasing growth temperature. Elevated CO2-grown spruce suppressed A ...