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Visar resultat 1 - 5 av 145 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Arsenic accumulation in plants for food and phytoremediation : Influence by external factors

   Författare :Claes Bergqvist; Maria Greger; Sylvia Lindberg; Lena Ma; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Arsenic; accumulation; availability; distribution; habitat; phy-toremediation; rhizosphere; redox potential; speciation; Plant Physiology; växtfysiologi;

   Sammanfattning : Arsenic (As) appears in the environment as various As species, which may vary in plant uptake and toxicity. Moreover, As exposure may vary between habitat due to availability and speciation, both of which are influenced by redox potential. To decrease As uptake, addition of silicate may be a tool. LÄS MER

3. 2. Effects of behavioural flexibility and habitat complexity on predator-prey interactions in fish communities

   Författare :Peter Eklöv; Gary G. Mittelbach; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; predator-prey interactions; behavioural flexibility; habitat complexity; foraging mode; sit-and-wait; group foraging; Perea fluviatilis; Esox lucius; Rutilus rutilus; size-structured interactions; species-specific antipredator behaviour; proximate cues; habitat distribution; temporal patterns;

   Sammanfattning : .... LÄS MER

4. 3. Spatial Modelling of Coastal Fish – Methods and Applications

   Författare :Göran Sundblad; Ulf Bergström; Alfred Sandström; Peter Eklöv; Christian Möllmann; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; habitat; niche; species distribution modelling; juvenile; fish; larvae; spawning; Marine ecology; Marin ekologi; NATURAL SCIENCES; NATURVETENSKAP; Freshwater ecology; Limnisk ekologi; Biology; Biologi; Biology with specialization in Limnology; Biologi med inriktning mot limnologi; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology; Limnologi; Limnology;

   Sammanfattning : Environmental factors influence species and habitats on multiple scales creating a mosaic of distribution patterns. Studying factors shaping these patterns are central to our understanding of population dynamics and ultimately ecosystem functioning. LÄS MER

5. 4. Plant species diversity in semi-natural grasslands. Effects of scale, landscape structure and habitat history

   Författare :Triin Reitalu; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; habitat fragmentation; landscape diversity; habitat connectivity; historical maps; continuity; land-use history;

   Sammanfattning : The thesis examines the impact of present and past landscape structure, habitat history and management on different aspects of present-day plant species diversity in fragmented semi-natural grasslands in Sweden and in Estonia. Species diversity was significantly associated with present and/or past grassland connectivity in the majority of the studies in the thesis. LÄS MER

7. 5. Ecology of juvenile turbot and flounder in the Central Baltic Sea : Implications for recruitment

   Författare :Jesper Martinsson; Sture Hansson; Magnus Appelberg; Anders Nissling; Leif Pihl; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Psetta maxima; Platichthys flesus; juvenile; Baltic Sea; nursery ground; distribution; recruitment; Marine Ecology; marin ekologi;

   Sammanfattning : Our understanding of turbot and flounder ecology in the Baltic Sea is insufficient for sound management decisions. This thesis aims to fill some gaps in current knowledge by providing information of the ecology of turbot and flounder within their juvenile habitat, and to relate these findings to issues assumed relevant for recruitment variation. LÄS MER