Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 50 for “"Subarctic"”.
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Summertime Carbon Dioxide Exchange over a Subarctic Sedge Wetland
<p>Measurements of net ecosystem carbon dioxide fluxes were made over a sedge fen, Churchill, Manitoba during the summertime period, 1994. This period, when compared to 50 year records (1943 to 1993), was warm and dry. The mean daily temperature was 2 "C warmer than normal. Total precipitation for …
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Drivers of productivity in a subarctic seabird: Arctic Terns in Iceland
Thesis abstract Marine ecosystems are changing rapidly in response to anthropogenic and environmental stresses, and seabird populations that depend on marine resources are in decline in many areas of the world. Iceland supports internationally important populations of many seabird species and, …
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Subarctic ecosystem responses to climate, catchment and permafrost dynamics in the Holocene
This thesis assesses aspects of the wetland development, permafrost dynamics and associated changes in carbon and nutrient cycling of the Stordalen Mire in northern Sweden. Various ecological and biogeochemical analyses of one peat and two lake sediment sequences were conducted, including analyses …
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Effect of Thermal Stress on Dimorphism of Subarctic Aedine Mosquitoes (Diptera: Culicidae)
Made available in DSpace on 2014-12-05T21:34:06Z (GMT). No. of bitstreams: 1 6402855.pdf: 3326330 bytes, checksum: 12f054dedf290990159785066e783911 (MD5) Previous issue date: 1963
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Climate Change and Dissolved Organic Matter in Subarctic Lakes: Relevance to Methylmercury Bioavailability
… likely cause MeHg bioavailability to decrease in subarctic lakes.
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Experimental warming of subarctic biocrust: Temporal responses of soil respiration and plant community
… in land use. Research on biocrust in arctic and subarctic regions is limited, much of the knowledge comes from lower latitudes in arid and semiarid ecosystems. Cold-adapted biocrust might respond differently to increasing temperatures when compared with warm-adapted biocrust. Therefore, it is …
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A planning program and the design for a single enterprise community in the Subarctic
Thesis (M.C.P.) Massachusetts Institute of Technology. Dept. of Architecture, 1956.
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Effects of soil temperature on Sphagnum moss litter quality and decomposition in a subarctic environment
High latitude peatlands play a significant role in global soil carbon budgets, attributed to the slow decomposition rate of Sphagnum mosses that facilitates carbon sequestration through the build-up of peat. As climate change is predicted to increase soil temperatures and decomposition rates of …
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A nitrogen based model for the cycling of carbon dioxide in the subarctic Pacific Ocean
This model explores the integration of a physical mixing model with an ecological model for the studies of the CO2 problem in the ocean. The model is specifically for the regional CO2 cycling at Ocean Station P (OSP, 50° N, 145°W) and is composed of a physical submodel for physical processes and a …
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Evidence for Local Adaptation in Birds
… transplant experiments between a temperate and subarctic site in Canada. Yellow Warblers breeding at our subarctic site build larger nests constructed with more insulative materials than Yellow Warblers breeding at our temperate site, and these differences are the result of different nest …
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Breeding Bird and Small Mammal Populations in Relation to the Forest Vegetation of the Subarctic Region of Northern Manitoba
Made available in DSpace on 2014-12-04T22:46:14Z (GMT). No. of bitstreams: 1 6100126.pdf: 6358830 bytes, checksum: a65212ebde0a34eb5be978208ac1391b (MD5) Previous issue date: 1960
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Using the growth patterns and geochemistry of coralline red algae to develop proxies for paleoclimate reconstruction in tropical and subarctic environments
… melt, longer summer growing seasons, and overall subarctic SST warming in Godthåbsfjord, Greenland.
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Using Light-Level Geolocation to Investigate the Carry-Over Effects of Long-Distance Migration on the Reproductive Success of Dunlin (Calidris Alpina Hudsonia)
… strategy affects reproductive success in a subarctic-nesting shorebird. I showed that female Dunlin (Calidris alpina) breeding in Churchill, MB laid eggs of increased volume after migrating longer distances at decreased speeds. Nest survival increased for female Dunlin that migrated longer …
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Natural gradients in temperature and nitrogen: Iceland represents a unique environment to clarify long-term global change effects on carbon dynamics
… warming and N input effects on C dynamics in subarctic grasslands, which cover ca. 10% of the global terrestrial surface. The primary advantage of natural gradients is that equilibrium states can be observed. Further, their typical wide and continuous nature allows to study the full range of …
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Phytoplankton dynamics in the northeast subarctic Pacific during the 1998 El Niño, the 1999 La Niña and 2000 with special consideration to the role of coccolithophores and diatoms
Phytoplankton dynamics and chemical characteristics of the euphotic zone were measured from 1998-2000 (an El Niño/La Niña cycle) at the 5 major stations along Line P. Near-shelf and offshore stations exhibited low seasonality in chlorophyll and moderate seasonality in particulate organic carbon …
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