Search for dissertations about: "land invasion"

Showing result 1 - 5 of 7 swedish dissertations containing the words land invasion.

2. 1. Understanding the adaptive capacity of the bumblebee Bombus terrestris across native and novel environments

   Author : Cecilia Hjort; Biodiversitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Bumblebees; Bombus terrestris; Pollination; Introgression; Single nucleotide polymorphisms; Whole Genome Sequencing; Landscape simplification; Gene flow; Morphology; Environmental variation; Invasion; Local adaptation; Island;

   Abstract : Anthropogenic stressors such as agricultural intensification, climate change, andincreased densities of non-native managed bees used for crop pollination arecontributing to bee declines. Understanding how and why bees have responded topast environmental changes is crucial for predicting future ones and enablingmitigation to maintain the functioning of both natural and agricultural ecosystems. READ MORE

4. 2. Resisting poverty : perspectives on participation and social development. The case of CRIC and the eastern rural region of Cauca in Colombia

   Author : Staffan Berglund; Umeå universitet; []
   Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Colombia; Cauca; CRIC; popular participation; poverty; social development; indigenous movement; social power; peasant; mobilization; participation; anti-participation; deprivation; national integration; land invasion; resistance; cultural survival;

   Abstract : With the reproduction of severe deprivation among the campesinado in Latin America as a starting-point,the report explores the mechanisms of impoverishment in the eastern rural region of the department of Cauca in Colombia and the forms of resistance initiated by the Regional Indigenous Council of Cauca (CRIC). It is postulated that the continued existence of poverty derives its root-causes not from lacking integration of the traditional sector of the national economy into the modern sector, but from the processes through which the poor indigenous staple-food producer and agricultural worker by way of his actual participation within the capitalistic system is continously deprived of his energy and capacity by the power elite as he himself lacks the means to realize his own developmental power* Sham-participation, refering to the dysfunctionality of systemic participation performed by the poor who lack access to the bases for accumulating social power, is a concept applied to understand these mechanisms. READ MORE

5. 3. Vegetation and land-use in the Småland Uplands, southern Sweden, during the last 6000 years

   Author : Per Lagerås; Kvartärgeologi; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Geologi; physical geography; Sweden; Geology; Småland Uplands; land-use history; pollen analysis; Holocene vegetation history; mineral magnetic analysis; AMS dating; clearance cairns; hay production; shifting cultivation; Picea migration; slash-and-burn cultivation; fysisk geografi;

   Abstract : Palaeoecological methods were applied to peat and sediment cores recovered from one bog (Bråtamossen) and two lakes (Avegöl and Femtingagölen) in the Småland Uplands, southern Sweden. The general aim was to reconstruct the landuse and vegetation history for the last 6000 years in this agriculturally marginal region. READ MORE

6. 4. Numerical modeling of fluid flow and solute transport in rock fractures

   Author : Liangchao Zou; Lanru Jing; Vladimir Cvetkovic; Chin-Fu Tsang; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Rough-walled rock fractures; Nonlinear flow; Solute transport; Navier-Stokes equations; Matrix diffusion; Uncertainty.; Mark- och vattenteknik; Land and Water Resources Engineering;

   Abstract : This study focuses on numerical modeling of fluid flow and solute transport in rough-walled rock fractures and fracture-matrix systems, with the main aim to investigate the impacts of fracture surface roughness on flow and transport processes in rock fractures. Both 2D and 3D fracture models were built from laser-scanned surface tomography of a real granite rock sample, to consider realistic features of surface tomography and potential asperity contacts. READ MORE

7. 5. Invading Herbivory. Effects of the Golden Apple Snail (Pomacea canaliculata) in Asian Wetlands

   Author : Nils Carlsson; Biologiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; gastropoda; invasive species; golden apple snail; herbivory; wetland functioning; biodiversity; sustainable control; indigenous predators; size-dependent competitive ability; akvatisk ekologi; limnologi; Marinbiologi; limnology; Hydrobiology; aquatic ecology; marine biology;

   Abstract : The South American golden apple snail (Pomacea canaliculata) was intentionally introduced to aquacultures in South East Asia to produce snails for human consumption, but the aquatic snails soon escaped and started to consume large amounts of rice seedlings. The aim of this thesis was to quantify the effects of this invasive herbivore on aquatic plants in natural wetlands since previous research has focused on effects of the snail in rice fields. READ MORE