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Effects of temperature and natural disturbance on growth, reproduction, and population density in the alpine annual hemiparasite euphrasia frigida

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dc.contributor.author Nyléhn, Jorun
dc.contributor.author Totland, Ørjan
dc.date.accessioned 2008-01-25T14:15:51Z
dc.date.available 2008-01-25T14:15:51Z
dc.date.issued 1999
dc.identifier.citation Arctic, antarctic and alpine research 1999 31 (3): 259-263. Copyright, Regents of the University of Colorado en
dc.identifier.issn 1523-0430
dc.identifier.uri http://hdl.handle.net/1956/2561
dc.description.abstract The effects of temperature and "natural disturbance" on growth, seed production, and population density in the facultative hemiparasitic annual Euphrasia frigida (Scrophulariaceae) were examined in the middle alpine zone at Finse, southwest Norway. Experimentally elevated temperature increased growth and seed production significantly. Higher temperatures resulted in a small decrease in population densities during three seasons. The degree of "natural disturbance" did not influence growth and seed production, but population density was highest at intermediate disturbance levels. Thus, while temperature influenced the performance of E. frigida, disturbance affected the population dynamics. The effects of temperature on growth and reproduction may also be indirect on hemiparasites, through improved conditions for the host plants under elevated temperatures. It is hypothesized that the predicted global warming will result in increased seed output from E. frigida plants in the middle alpine zone. Population densities, however, are likely to decrease under elevated temperatures, due to lower disturbance levels by frost heave and increased vegetation cover en
dc.language.iso eng en
dc.publisher The Institute of Arctic and Alpine Research en
dc.title Effects of temperature and natural disturbance on growth, reproduction, and population density in the alpine annual hemiparasite euphrasia frigida en
dc.type Peer reviewed en
dc.type Journal article en
dc.subject.nsi VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 no


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