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.
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Claims 7
Claim · model-written summary
Experimental warming significantly increased Euphrasia growth and seed production.
- Taxon
- Euphrasia frigida
Euphrasia frigidat0 - Treatment
- elevated temperaturee0
- Outcome
- growth and seed productione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Experimentally elevated temperature increased growth and seed production significantly.”
t0“Euphrasia frigida”
Claim · model-written summary
Higher temperatures caused a small decrease in Euphrasia population density over three seasons.
- Taxon
- Euphrasia frigidaEuphrasia frigidat0
- Treatment
- Higher temperaturese0
- Outcome
- population densitiese0
- Direction
- decreasee0
- Qualifier
- during three seasonse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher temperatures resulted in a small decrease in population densities during three seasons.”
t0“Euphrasia frigida”
Claim · model-written summary
Natural disturbance did not influence Euphrasia growth and seed production.
- Taxon
- Euphrasia frigidaEuphrasia frigidat0
- Outcome
- growth and seed productione0
- Direction
- did not influencee0
- Setting
- “natural disturbance”e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The degree of “natural disturbance” did not influence growth and seed production”
t0“Euphrasia frigida”
Claim · model-written summary
Euphrasia population density peaked at intermediate disturbance.
- Taxon
- Euphrasia frigidaEuphrasia frigidat0
- Outcome
- population densitye0
- Direction
- higheste0
- Setting
- intermediate disturbance levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“population density was highest at intermediate disturbance levels.”
t0“Euphrasia frigida”
Claim · model-written summary
Authors suggest warming effects on hemiparasites may be mediated by improved host conditions.
- Taxon
- Euphrasia frigidaEuphrasia frigidat0
- Interactor
- host plantse0host
- Outcome
- growth and reproductione0
- Qualifier
- through improved conditions for the host plants under elevated temperaturese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of temperature on growth and reproduction may also be indirect on hemiparasites, through improved conditions for the host plants under elevated temperatures.”
t0“Euphrasia frigida”
Claim · model-written summary
Authors hypothesize global warming will increase Euphrasia seed output.
- Taxon
- E. frigidaEuphrasia frigidae0
- Outcome
- seed outpute0
- Direction
- increasede0
- Setting
- middle alpine zonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is hypothesized that the predicted global warming will result in increased seed output from E. frigida plants in the middle alpine zone.”
Claim · model-written summary
Authors project Euphrasia population density will decrease under warming.
- Taxon
- Euphrasia frigidaEuphrasia frigidat0
- Outcome
- Population densitiese0
- Direction
- decreasee0
- Qualifier
- due to lower disturbance levels by frost heave and increased vegetation covere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Population densities, however, are likely to decrease under elevated temperatures, due to lower disturbance levels by frost heave and increased vegetation cover.”
t0“Euphrasia frigida”
The same questions in other papers
heat · yield · Euphrasia frigidaResults agree
1 paper in the same direction as this paper
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.