Abstract
Overstory Populus has been shown to facilitate establishment by cyano- and cephalolichens on conifer branches within its dripzone; though the mechanisms behind this “dripzone effect” have yet to be elucidated. Here we test the following hypotheses that throughfall from Populus: (i) elevates bark pH; (ii) increases relative growth rate in cephalolichens; and (iii) stimulates their growth through phosphorus (P) fertilization. In southern British Columbia we transplanted the cephalolichen Lobaria pulmonaria (L.) Hoffm. (promoted by dripzones) and the acidophytic chlorolichen Hypogymnia occidentalis L.H. Pike for 14 months to 26 pairs of similar-sized Picea glauca × engelmannii situated within and outside of Populus dripzones. Half of our transplants were fertilized with P. Bark pH was significantly higher on spruce branches within than outside dripzones. Relative growth rate in L. pulmonaria increased with bark pH and was slightly higher within dripzones than outside, consistent with a facilitating effect of Populus on the Lobarion community. By contrast, the addition of P decreased relative thallus area growth in L. pulmonaria and increased relative thallus area growth in H. occidentalis; though a stronger influence on growth could be attributed to variation in canopy cover and tree height. We conclude that cephalolichens in our study area are unlikely to be facilitated by P leached from Populus.
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Claims 7
Claim · model-written summary
Spruce bark pH was higher within Populus dripzones.
PopulusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bark pH was significantly higher on spruce branches within than outside dripzones”
e1“Overstory Populus has been shown to facilitate establishment by cyano- and cephalolichens on conifer branches within its dripzone”
Claim · model-written summary
Lobaria pulmonaria relative growth rate rose with bark pH.
- Interactor
- L. pulmonaria
Lobaria pulmonariae0other - Outcome
- Relative growth rate in L. pulmonariae0
- Direction
- increasede0
- Qualifier
- bark pHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative growth rate in L. pulmonaria increased with bark pH”
e1“Overstory Populus has been shown to facilitate establishment by cyano- and cephalolichens on conifer branches within its dripzone”
Claim · model-written summary
Lobaria pulmonaria growth was slightly higher inside dripzones.
- Interactor
- L. pulmonariaLobaria pulmonariae0other
- Outcome
- Relative growth rate in L. pulmonariae0
- Direction
- highere0
- Comparator
- outsidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative growth rate in L. pulmonaria increased with bark pH and was slightly higher within dripzones than outside”
e1“Overstory Populus has been shown to facilitate establishment by cyano- and cephalolichens on conifer branches within its dripzone”
Claim · model-written summary
Phosphorus addition decreased Lobaria pulmonaria relative thallus area growth.
- Treatment
- addition of Pe0
- Interactor
- L. pulmonariaLobaria pulmonariae0other
- Outcome
- relative thallus area growth in L. pulmonariae0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the addition of P decreased relative thallus area growth in L. pulmonaria”
e1“Overstory Populus has been shown to facilitate establishment by cyano- and cephalolichens on conifer branches within its dripzone”
Claim · model-written summary
Phosphorus addition increased Hypogymnia occidentalis relative thallus area growth.
- Treatment
- addition of Pe0
- Interactor
- H. occidentalis
.jpg?width=60)
Hypogymnia occidentalise0other - Outcome
- relative thallus area growth in H. occidentalise0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“the addition of P decreased relative thallus area growth in L. pulmonaria and increased relative thallus area growth in H. occidentalis”
e1“Overstory Populus has been shown to facilitate establishment by cyano- and cephalolichens on conifer branches within its dripzone”
Claim · model-written summary
Canopy cover and tree height had a stronger influence on lichen growth.
Not reportedSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a stronger influence on growth could be attributed to variation in canopy cover and tree height”
e1“Overstory Populus has been shown to facilitate establishment by cyano- and cephalolichens on conifer branches within its dripzone”
Claim · model-written summary
The authors concluded that Populus phosphorus leachate was unlikely to facilitate cephalolichens.
- Outcome
- cephalolichens in our study area are unlikely to be facilitatede0
- Qualifier
- P leached from Populuse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cephalolichens in our study area are unlikely to be facilitated by P leached from Populus”