Abstract
Thalli of Nephroma arcticum were transplanted between and within a high-elevation alpine heath (1100 m) and a low-elevation subalpine mountain birch forest (380 m) in northern Swedish Lapland and harvested after eight years. Statistically significant differences (P < 0.05) were found between control samples for dark respiration rates, photon use efficiencies (apparent quantum yields) and light compensation points (all were higher in the high-altitude population). The following traits were significantly affected by transplanting: (1) epicortex thickness, (2) upper cortex thickness in the low-altitude population, (3) maximum photosynthetic rates, (4) dark respiration rates and (5) light compensation point. Of these malleable traits, all reduce the differences between the controls although there seems to be over-compensation in maximum net photosynthesis and under-compensation in dark respiration rate of the low-altitude population. Conservative traits, i.e., those that did not change significantly with transplantation were: (1) thallus thickness, (2) algal layer thickness, (3) algal cell diameter and (4) light saturation level. Small, yet significant differences in anatomy and physiology suggest that an ecotypic differentiation was established although the two internal transcribed DNA spacers ITS 1 and ITS 2 showed no corresponding variation between the populations.
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Claims 7
Claim · model-written summary
High-altitude controls had higher dark respiration rates, photon use efficiencies and light compensation points than low-altitude controls.
- Taxon
- Nephroma arcticum
.jpg?width=60)
Nephroma arcticume1 - Material
- high-altitude populatione0
- Outcome
- dark respiration rates, photon use efficiencies (apparent quantum yields) and light compensation pointse0
- Direction
- highere0
- Value
- P < 0.05e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Statistically significant differences (P < 0.05) were found between control samples for dark respiration rates, photon use efficiencies (apparent quantum yields) and light compensation points (all were higher in the high-altitude population)”
e1“Nephroma arcticum”
Claim · model-written summary
Transplanting significantly changed epicortex thickness.
- Taxon
- Nephroma arcticumNephroma arcticume1
- Treatment
- transplantinge0
- Outcome
- epicortex thicknesse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The following traits were significantly affected by transplanting: (1) epicortex thickness”
e1“Nephroma arcticum”
Claim · model-written summary
Transplanting significantly changed upper cortex thickness in the low-altitude population.
- Taxon
- Nephroma arcticumNephroma arcticume2
- Material
- low-altitude populatione0
- Treatment
- transplantinge1
- Outcome
- upper cortex thicknesse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“upper cortex thickness in the low-altitude population”
e1“significantly affected by transplanting”
e2“Nephroma arcticum”
Claim · model-written summary
Transplanting significantly changed maximum photosynthetic rates, dark respiration rates and light compensation point.
- Taxon
- Nephroma arcticumNephroma arcticume2
- Treatment
- transplantinge1
- Outcome
- maximum photosynthetic ratese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximum photosynthetic rates, (4) dark respiration rates and (5) light compensation point”
e1“significantly affected by transplanting”
e2“Nephroma arcticum”
Claim · model-written summary
Transplanting did not significantly change thallus thickness, algal layer thickness or algal cell diameter.
- Taxon
- Nephroma arcticumNephroma arcticume1
- Treatment
- transplantatione0
- Outcome
- thallus thickness, (2) algal layer thickness, (3) algal cell diametere0
- Direction
- did not changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“those that did not change significantly with transplantation were: (1) thallus thickness, (2) algal layer thickness, (3) algal cell diameter”
e1“Nephroma arcticum”
Claim · model-written summary
Transplanting did not significantly change light saturation level.
- Taxon
- Nephroma arcticumNephroma arcticume1
- Treatment
- transplantatione0
- Outcome
- light saturation levele0
- Direction
- did not changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“did not change significantly with transplantation were: (1) thallus thickness, (2) algal layer thickness, (3) algal cell diameter and (4) light saturation level”
e1“Nephroma arcticum”
Claim · model-written summary
ITS 1 and ITS 2 showed no variation corresponding to population differences.
- Taxon
- Nephroma arcticumNephroma arcticume1
- Gene
- ITS 1 and ITS 2e0
- Outcome
- variation between the populationse0
- Direction
- no corresponding variatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two internal transcribed DNA spacers ITS 1 and ITS 2 showed no corresponding variation between the populations”
e1“Nephroma arcticum”