uid=HFR,o=lter,dc=ecoinformatics,dc=org
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public
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doi:10.6073/pasta/b9c5d6674d9c7736a90ba691fa24c647
Growth Rates of Xanthoparmelia Lichens in North Cemetery, Petersham MA 2005-2011
Anne
Pringle
https://orcid.org/0000-0002-1526-6739
2024
English
Lichens fix carbon dioxide from the air to build biomass. Crustose and foliose lichens grow as nearly flat, circular disks. While smaller lichens grow slowly, but with small, steady increases in radial growth rates, larger lichens grow more quickly, with radial velocities that remain roughly constant over the lifetime of an individual. These basic features follow directly from a novel mathematical model based on the diffusion of carbon dioxide around a lichen, and its absorption by the thallus. Smaller lichens fix carbon dioxide across the entire thallus, but larger lichens fix carbon dioxide disproportionately at edges. Because local edges remain the primary source of carbon as a lichen grows ever larger, radial growth rates remain constant. Predicted growth dynamics depend on four measurable parameters, and tests of the model against data suggest the model provides an accurate, robust, and universal framework for understanding the growth dynamics of lichens in nature.
carbon dioxide
demography
growth
lichens
modeling
population dynamics
LTER controlled vocabulary
populations
LTER core area
Harvard Forest
HFR
LTER
USA
HFR default
This dataset is released to the public under Creative Commons CC0 1.0 (No Rights Reserved). Please keep the dataset creators informed of any plans to use the dataset. Consultation with the original investigators is strongly encouraged. Publications and data products that make use of the dataset should include proper acknowledgement.
Creative Commons Zero v1.0 Universal
https://spdx.org/licenses/CC0-1.0.html
CC0-1.0
https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf217
North Cemetery (Petersham MA). Coordinates based on WGS84 datum.
-72.19
-72.19
42.53
42.53
331
331
meter
2005
2011
genus
Xanthoparmelia
completed
Information Manager
Harvard Forest
324 North Main Street
Petersham
MA
01366
USA
(978) 724-3302
hf-im@lists.fas.harvard.edu
Harvard Forest
324 North Main Street
Petersham
MA
01366
USA
(978) 724-3302
(978) 724-3595
https://harvardforest.fas.harvard.edu
A group of 55 foliose lichens growing on the French tombstone of the North Cemetery, Petersham, MA, USA was used to measure growth rates of lichens in nature. Target individuals are morphologically uniform and belong to the genus Xanthoparmelia. Inscribed letters and numbers were used to make a map of the entire population and identify individual thalli from year to year. Each thallus was measured each fall for seven years, starting in 2005. A transparent piece of plastic was placed over the thallus and the diameter of the thallus traced with permanent marker. Tracings were digitized and the area calculated from digitized images. New individuals born in 2006, 2007, 2008 and 2009 were added to the survey, and during the survey 32 individuals died. By the end of the survey, in 2011, data had been collected for a total of 72 individuals.
In the data file, the observed values for an individual (alive, merge, size) are coded as NA before a birth is recorded and after a death is recorded. NA may also indicate missing observations. After a merger, the larger individual is coded as alive = 1, merge = 1 for as long as it lives; while the smaller individual is coded as alive = 0, merge = 1 and then as NA. Fragmented individuals (merge = 3) may revert to unmerged (merge = 0) at the next observation. Outlier births are coded as NA.
Harvard Forest Long-Term Ecological Research
Harvard Forest
324 North Main Street
Petersham
MA
01366
USA
(978) 724-3302
(978) 724-3595
https://harvardforest.fas.harvard.edu
https://ror.org/059cpzx98
pointOfContact
The Harvard Forest Long-Term Ecological Research (LTER) program examines ecological dynamics in the New England region resulting from natural disturbances, environmental change, and human impacts.
National Science Foundation LTER grants: DEB-8811764, DEB-9411975, DEB-0080592, DEB-0620443, DEB-1237491, DEB-1832210.
hf217-01-lichen-growth-rates.csv
lichen growth rates
hf217-01-lichen-growth-rates.csv
22462
6d294e1c6dd997ae92bc2f31b7773696
1
\r\n
column
,
https://harvardforest.fas.harvard.edu/data/p21/hf217/hf217-01-lichen-growth-rates.csv
grave
grave identification
grave identification
NA
missing value
individual
lichen identification
lichen identifcation
NA
missing value
year
year of measurement
YYYY
1 year
NA
missing value
alive
whether or not lichen was alive
0
not alive
1
alive
NA
missing value
merge
indicates a merger between two individual lichens
0
smaller
1
larger
3
fragmented
NA
missing value
size
size of lichen
squareCentimeters
0.000000001
real
NA
missing value
756
informatics
community
long-term measurement
modeling