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Range margins and refugia
Stockholm University, Faculty of Science, Department of Botany.
2013 (English)Report (Other academic)
Abstract [en]

Species ranges are restricted in distribution by physical barriers, dispersal ability, abiotic factors such as climate and interspecific interactions. The responses of a species to environmental conditions and biotic factors determine its abundance, distribution and range limits. There are four possible responses for populations facing global climate change. They can acclimate, adapt, shift their ranges or go extinct. During unfavorable conditions populations may shift their ranges and survive in refugia with favorable environmental features. Thereafter they might be able to return to their former distribution when the conditions get favorable again. The term refugium has been used for large scale refugia such as interglacial and glacial refugia (macrorefugia), and for small scale refugia such as microrefugia. The existence of microrefugia is promoted by decoupling of the local climate from the regional climate because this buffers against climate change. Such decoupling is most likely to occur in heterogeneous landscapes. At a range shift, new microrefugia may arise at the eroding edge, while macrorefugia may form from a contracting main (continuous) range.

Abstract [sv]

Arters utbredningsområden är begränsade av fysiska barriärer, arters spridningsförmåga, abiotiska faktorer såsom klimat samt interaktioner mellan arter. Hur en art reagerar på miljöfaktorer och biotiska faktorer bestämmer dess abundans, utbredning och avgränsning av utbredning. Det finns fyra olika typer av respons på globala klimatförändringar. En population kan acklimatiseras, anpassas, migrera eller dö ut. Under ogynnsamma förhållanden kan populationer migrera och överleva i refugier med gynnsamma miljöförhållanden. Därefter kan de återvända till deras förra utbredningsområden när förhållandena återigen har blivit gynnsamma. Begreppet refugium har använts för storskaliga refugier såsom interglaciala och glaciala refugier (makrorefugier) samt för småskaliga refugier såsom mikrorefugier. Mikrorefugiers existens gynnas av att det lokala klimatet frikopplas från det regionala klimatet eftersom detta buffrar mot klimatförändringar. Sådan frikoppling sker mest sannolikt i heterogena landskap. När en art flyttar sitt utbredningsområde så kan nya refugier bildas vid den retirerande utbredningsgränsen. Makrorefugier kan bildas från artens huvudutbredningsområde om det minskar.

Place, publisher, year, edition, pages
Stockholm: Stockholm University, 2013. , 41 p.
Plants & Ecology, ISSN 1651-9248 ; 2013/1
Keyword [en]
range margin, range edge, refugium, refugia, microrefugia, macrorefugia, species range, range shift, distribution, migration, climate change, glacial, interglacial
National Category
Research subject
Ecological Botany; Animal Ecology
URN: urn:nbn:se:su:diva-86000OAI: diva2:585837
Available from: 2013-01-10 Created: 2013-01-10 Last updated: 2013-01-10Bibliographically approved

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Dahlberg, Johan
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