Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1997. / Title from PDF t.p. (viewed Dec. 14, 2005). Vita. Includes bibliographical references (p. 62-65).

It is estimated that 10-15% of the worlds blanket bog occurs in British uplands, although this is at risk due to land-use change, climate change and tourism. Currently, several types of management and restoration work are underway in many upland areas to prevent further degradation (RSPB, 2007). Within the RSPB Vyrnwy reserve a five year management plan is currently in progress. The area contains numerous drainage ditches created to improve the quality of grazing. This has lead to a loss of blanket bog vegetation, as the drains facilitate the removal of water, across the site (Worrall, et al, 2007). To encourage the reformation of blanket bogs these ditches are now being dammed. Approximately 4500 ha will be treated over the five year period, with an estimated 18km of drains blocked each year. Previous studies suggest this will lead to increases in CH4 flux from peatlands (Price, 1997). CH4 flux rates at difference water tables in Calluna and Eriophorum cores from Lake Vyrnwy were measured in a controlled environment. It was concluded that, in the short term, water table manipulation does influence net CH4 flux rates in peat cores from this system. In Eriophorum cores a positive flux was recorded at the high water table but not where the water table was 10cm lower. A 13C-CH4 approach was also applied to more accurately determine CH4 oxidation rates. These results indicated CH4 oxidation was occurring at all water tables and in both vegetation types, even when a positive net flux was seen. It was established that comparing both 12+13C-CH4 flux rates, and 13C-CH4 oxidation rates provided more information on the impacts of water table manipulation than relying on flux data alone. Data presented suggests that gripping at Lake Vyrnwy has the potential to decrease rates of CH4 oxidation across the site.

Burns Bog (the Bog) is a 2800 ha protected peatland in Delta, British Columbia. Globally unique due to its form, size, chemistry, flora and fauna the Bog is distinct and managed as a wetland. In 2005, a large fire consumed 200 ha of peatland after which birch (Betula pendula) and pine (Pinus contorta) trees grew in great densities. Within the fire zone piezometers were installed to monitor water levels below the surface. A high water level promotes peat-forming processes and in 2009 water levels dropped significantly. In 2010, a 75m x 50m experimental plot within the fire zone was cleared of birch and pine trees to investigate the impacts of tree removal on bog hydrology and plant communities. Higher water levels and positive bog plant growth at the experimental site was observed in 2010 and 2011 when compared to the control site where trees remained intact.

No description available.

Tyrimų tikslas ištirti Puščios pelkės dieninių drugių bioįvairovę ir palyginti su natūralia Kernavo pelke. Drugių santykiniam gausumui nustatyti buvo naudojamas maršrutinis metodas. Buvo užregistruota 31 drugių rūšis (302 individai), priklausantys penkioms šeimoms: vienai naktinių drugių šeimai ir keturioms dieninių drugių šeimom. Išskirtos 12 stenotopinių (tirfobiontinės ir tirfofilinės) drugių rūšys: 6 tirfobiontinės (baltajuostis melsvys (Aricia eumedon), pelkinis melsvys (Plebeius optilete), žalsvasis varinukas (Callophrys rubi), miškapievis perlinukas (Boloria euphrosyne), blyškusis žaliasprindis (Jodis putata), rudasprindis (Ematurga atomaria) ir 6 tirfofilinės (žaliaakis melsvys (Plebeius idas), didysis auksinukas (Lycaena dispar), rausvasis perlinukas (Argynonome laodice), mažasis perlinukas (Boloria dia), gelsvasis perlinukas (Brenthis ino), pievinis perlinukas (Boloria selene). Visos kitos užregistruotos rūšys yra tirfoneutralios, kurios nėra būdingos aukštapelkių ekosistemoms. Trijose skirtingose buveinėse: atstatomo durpyno pamiškė, atstatomas durpynas ir natūralios pelkės pamiškė buvo užregistruotas skirtinga drugių rūšių įvairovė bei rūšių gausumas. Skurdžiausia rūšių įvairove ir rūšių gausumu pasižymėjo atstatomo durpyno drugių bendrija, dėl mitybinių augalų nebuvimo ir nenusistovėjusio hidrologinio režimo. Puščios pelkės drugių bendrijos sudėtis yra panaši į aukštapelkių, nors nebuvo užregistruotos reliktinės drugių rūšys: pelkinis satyras (Oeneis jutta)... [toliau žr. visą tekstą] / The aim of this work was to study butterflies and moths (Macrolepidoptera) and their diversity in the Puščia peat bog and to compare it with natural Kernavas peat bog. The abundance of butterflies and day-active moths’ species was evaluated using transect method. A total of 302 Lepidoptera specimens belonging to 31 species and five families (one moth family and four butterflies’ families) were registered. Twelve species (six tyrphobiontic (Aricia eumedon, Plebeius optilete, Callophrys rubi, Boloria euphrosyne, Jodis putata, and Ematurga atomaria) and six tyrphophilous (Plebeius idas, Lycaena dispar, Argynome laodice, Boloria dia, Brenthis ino, and Boloria selene) were obligatory associated with peat bogs. Other species showed no preference to bogs. Three different habitats of Puščia peat bog were studied: renewable peat bog’s site, renewable peat bog and natural peat bog outskirt. Variety and abundance of different lepidopterans species were recorded in the studied habitats. The sparse abundance and variety of butterflies species was noted in the renewable peat bog habitat due to sparse vegetation, upset hydrological regime and exploitation of peat. The diversity of butterflies in Puščia peat bog seems to be typical to the raised bog ecosystem, though relict species (e.g. Oeneis jutta, Proclossiana eunomia and Colias palaeno) were not found there. The absence of these species shows degradation of the Puščia peat bog. The Puščia bog is a valuable site for some rare butterrfly... [to full text]

Thesis (M.Sc.). / Written for the Dept. of Geography. Title from title page of PDF (viewed 2008/05/29). Includes bibliographical references.

Thesis (M.S.)--University of Wisconsin, 1969. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 56-63).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1936. / Typescript. Includes abstract and vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 111-113).

Thesis--University of Wisconsin-Madison, 1976. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (p. 191-196).

Thesis (Ph. D.)--University of Chicago, 1921. / "Private edition, distributed by the University of Chicago Libraries, Chicago, Illinois." "Contributions from the Hull botanical laboratory 288." "Reprinted from the Hull botanical gazette, vol. LXXII, no. 6, December, 1921." "Literature cited": p. 373-374.