Effects of temperature and natural disturbance on growth, reproduction, and population density in the alpine annual hemiparasite euphrasia frigida
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 incre...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
The Institute of Arctic and Alpine Research
1999
|
Subjects: | |
Online Access: | http://hdl.handle.net/1956/2561 |
id |
ftunivbergen:oai:bora.uib.no:1956/2561 |
---|---|
record_format |
openpolar |
spelling |
ftunivbergen:oai:bora.uib.no:1956/2561 2023-05-15T16:08:29+02:00 Effects of temperature and natural disturbance on growth, reproduction, and population density in the alpine annual hemiparasite euphrasia frigida Nyléhn, Jorun Totland, Ørjan 1999 application/pdf http://hdl.handle.net/1956/2561 eng eng The Institute of Arctic and Alpine Research urn:issn:1523-0430 http://hdl.handle.net/1956/2561 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 Peer reviewed Journal article 1999 ftunivbergen 2023-03-14T17:38:45Z 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 Article in Journal/Newspaper Euphrasia frigida University of Bergen: Bergen Open Research Archive (BORA-UiB) Norway |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 Nyléhn, Jorun Totland, Ørjan Effects of temperature and natural disturbance on growth, reproduction, and population density in the alpine annual hemiparasite euphrasia frigida |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 |
description |
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 |
format |
Article in Journal/Newspaper |
author |
Nyléhn, Jorun Totland, Ørjan |
author_facet |
Nyléhn, Jorun Totland, Ørjan |
author_sort |
Nyléhn, Jorun |
title |
Effects of temperature and natural disturbance on growth, reproduction, and population density in the alpine annual hemiparasite euphrasia frigida |
title_short |
Effects of temperature and natural disturbance on growth, reproduction, and population density in the alpine annual hemiparasite euphrasia frigida |
title_full |
Effects of temperature and natural disturbance on growth, reproduction, and population density in the alpine annual hemiparasite euphrasia frigida |
title_fullStr |
Effects of temperature and natural disturbance on growth, reproduction, and population density in the alpine annual hemiparasite euphrasia frigida |
title_full_unstemmed |
Effects of temperature and natural disturbance on growth, reproduction, and population density in the alpine annual hemiparasite euphrasia frigida |
title_sort |
effects of temperature and natural disturbance on growth, reproduction, and population density in the alpine annual hemiparasite euphrasia frigida |
publisher |
The Institute of Arctic and Alpine Research |
publishDate |
1999 |
url |
http://hdl.handle.net/1956/2561 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Euphrasia frigida |
genre_facet |
Euphrasia frigida |
op_relation |
urn:issn:1523-0430 http://hdl.handle.net/1956/2561 |
_version_ |
1766404533973417984 |