GGR305H1 Chapter 12: GGR305H1 Chapter : GGR305H1 Chapter : GGR305H1 Chapter : GGR305H1 Chapter : GGR305H1 Chapter : GGR305H1 Chapter : GGR305H1 Chapter : GGR305H1 Chapter : GGR305H1 Chapter : GGR305H1 Chapter : Week 2 Chapter 12—Ice and Change
6 Jan 2019
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Document Summary
January 16, 2019: ice covered canada, parts of us, northern europe, and asia during various stages of. Pleistocene: independent centres of glaciation formed in lower latitude mountains alps, himalayas, Soils continuously disturbed by action of frost: interglacial: warm episode sandwiched between two glacial events that achieved sufficient warmth for long enough duration for temperate vegetation to establish itself. Progressive change from high artic to subarctic to boreal to temperate conditions. Interstadial: if warm event is only of short duration or temperatures attained are not sufficiently high: palynology: analysis of pollen grain assemblages. Biological changes in pleistocene: during interglacials, tundra species became restricted due to high summer temperatures and inability to compete with more robust, productive species. High altitude sites sometimes served as refugia: during glacials, sites that were sheltered, south-facing, or oceanic may have served as refugia for warmth-demanding species. Deciduous forests survived glacial episodes in spain, portugal, italy, greece, danube.
