uid=HFR,o=lter,dc=ecoinformatics,dc=org
all
public
read
doi:10.6073/pasta/459596691a72d77049f23ff090fcd4fc
Adult Population Survey of Hemlock Woolly Adelgid in Massachusetts 2003-2005
Scott
Costa
David
Orwig
https://orcid.org/0000-0001-7822-3560
Joseph
Brown
Researcher
Bruce
Parker
Researcher
2023
English
To effectively document insect presence and abundance a statistically based sampling plan is necessary. No such plan for the hemlock woolly adelgid is currently available in the published literature. Two interrelated sampling strategies allow a researcher to enter a site and determine with a given level of probability whether or not an HWA infestation is present and the level of infestation. A ground based sampling plan is also critical to the ‘ground truthing’ of aerial survey systems. A fully developed sampling plan requires relatively extensive datasets obtained over time, and may include the use of computer-generated data obtained through re-sampling techniques. The results obtained through the Harvard Forest Summer Research Program should provide a firm foundation for further development of an HWA sampling program. Data collection is on-going.
hemlock
hemlock woolly adelgid
populations
surveys
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=hf104
Massachusetts. Coordinates based on WGS84 datum.
-73.51
-69.93
+42.89
+41.24
0
420
meter
2003
2005
genus
Adelges
species
tsugae
hemlock woolly adelgid
genus
Tsuga
species
canadensis
eastern hemlock
complete
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
For each site that is sampled there are 4 blocks/site, 25 trees/block, 2 branches/tree and 5 branch fronds/branch. Each site is roughly divided into 4 blocks. The blocks should be large enough to prevent overlap. Go to the middle of the block you intend to sample. Look at your datasheet to ascertain the Card #. The numbers range from 1 – 8 and represent the cardinal directions every 45 degrees starting with North as 1. Walk 25 paces and select the closest tree along that azimuth with branches that you can reach. Understory trees are fine for sampling.
The following samples are taken: (1) Whole tree sample - Spend up to 30 seconds examining the underside of branches throughout the canopy for indications of HWA, i.e. the presence of white wooly tufts. If you find any signs of HWA stop searching and mark the Tstat as 1, if no sign after 30 seconds then enter a 0. You only need one entry for each tree within a block. Record the length of time to make determination if tree is positive. (2) Go to point where you came up to the tree and select the closest 1-meter-long branch. (3) Examine 5 fronds, each approx. 25 cm long, for the presence or absence of HWA. Pick each frond from the top so you don’t select only those with HWA. Count the number of wooly tufts on the branchlet closest to where you are grasping the frond. Mark the data sheet accordingly under F1-F5 for presence or absence. If adelgids are present record the number of adelgids in the F1-F5 slots. If none were present a 0 was recorded. (4) If any adelgids were found mark the Bstat (branch statistic) with an 1. If no adelgids were found then examine the underside of the 1 meter branch for the presence or absence of adelgids and record the results. (5) Go to a branch on the opposite side of the tree and repeat steps 5 and 6. (6) Now repeat tree selection by using the next random Card# on the datasheet. (7) Repeat steps 3 – 8 until the entire block (25 trees) is sampled then go to the next block.
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.
hf104-01-survey.csv
survey data
hf104-01-survey.csv
4348
023eef7b48fa380fd5f4851aea6bb559
1
\r\n
column
,
https://harvardforest.fas.harvard.edu/data/p10/hf104/hf104-01-survey.csv
date
date sample was taken
YYYY-MM-DD
1 day
tract
Harvard Forest tract
Prospect Hill
Prospect Hill
Simes
Simes
Slab City
Slab City
Tom Swamp
Tom Swamp
plot
subdivision of tract. Approximate size = 6 ha
subdivision of tract. Approximate size = 6 ha
block
division of plot
division of plot
component
hemlock component
A-B
plot contains areas representing both A and B
A
more than 50% hemlock
B
less than 50% hemlock
trees
number of trees examined
number
1
natural
NA
missing value
infested
number of infested trees found
number
1
whole
NA
missing value
127
invasive
regional
short-term measurement