Abstract
An investigation has been made of the distribution patterns of Acer saccharum Marsh. on, and in close proximity to the limit of the range of the species in, northern Cape Breton Island. The limit of the range of the species cannot now be clearly delineated at sea level, but at greater elevations varies from altitudes of the order of 800 feet on seaward slopes to 1300 feet inland. In both primeval and second growth areas the density and dominance of the species vary widely, with a trend toward lower stocking with increasing altitudes. In some areas the limit of the range is marked by widely scattered trees whereas in others the density of the species is fairly high. Irrespective of stocking, there is no gradual transition in size toward a depauperate form or a marked decrease in vigour upon approaching the limit of the range of the species. On the basis of present evidence it is difficult to decide whether the limit of the range is stationary, advancing or retreating.
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Claims 7
Claim · model-written summary
At greater elevations the range limit varies from about 800 feet on seaward slopes to 1300 feet inland.
- Taxon
- Acer saccharum Marsh.
Acer saccharumt0 - Outcome
- limit of the rangee0
- Value
- 800 feet on seaward slopes to 1300 feet inlande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The limit of the range of the species cannot now be clearly delineated at sea level, but at greater elevations varies from altitudes of the order of 800 feet on seaward slopes to 1300 feet inland”
t0“Acer saccharum Marsh.”
Claim · model-written summary
Density and dominance vary widely in primeval and second growth areas.
- Taxon
- Acer saccharum Marsh.Acer saccharumt0
- Outcome
- density and dominancee0
- Setting
- primeval and second growth arease0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both primeval and second growth areas the density and dominance of the species vary widely”
t0“Acer saccharum Marsh.”
Claim · model-written summary
Stocking tends to be lower at higher altitudes.
- Taxon
- Acer saccharum Marsh.Acer saccharumt0
- Outcome
- stockinge0
- Direction
- lowere0
- Setting
- increasing altitudese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a trend toward lower stocking with increasing altitudes”
t0“Acer saccharum Marsh.”
Claim · model-written summary
At range limits, tree density ranges from scattered to fairly high among areas.
- Taxon
- Acer saccharum Marsh.Acer saccharumt0
- Outcome
- density of the speciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In some areas the limit of the range is marked by widely scattered trees whereas in others the density of the species is fairly high”
t0“Acer saccharum Marsh.”
Claim · model-written summary
Near the range limit there is no gradual transition to a depauperate size.
- Taxon
- Acer saccharum Marsh.Acer saccharumt0
- Outcome
- sizee0
- Direction
- no gradual transitione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is no gradual transition in size toward a depauperate form”
t0“Acer saccharum Marsh.”
Claim · model-written summary
Near the range limit there is no marked decrease in vigour.
- Taxon
- Acer saccharum Marsh.Acer saccharumt0
- Outcome
- vigoure0
- Qualifier
- upon approaching the limit of the range of the speciese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“or a marked decrease in vigour upon approaching the limit of the range of the species”
t0“Acer saccharum Marsh.”
Claim · model-written summary
Evidence does not establish whether the range limit is stationary, advancing or retreating.
- Taxon
- Acer saccharum Marsh.Acer saccharumt0
- Outcome
- limit of the rangee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it is difficult to decide whether the limit of the range is stationary, advancing or retreating”
t0“Acer saccharum Marsh.”