uid=HFR,o=lter,dc=ecoinformatics,dc=org
all
public
read
doi:10.6073/pasta/c5e6555def9baf3e53180395e9e15099
Stream Macroinvertebrates in Hemlock and Deciduous Watersheds at Harvard Forest 2005-2007
James
Willacker
https://orcid.org/0000-0002-6286-5224
William
Sobczak
Elizabeth
Colburn
2023
English
Tsuga canadensis (Eastern Hemlock) is a common forest species that is declining throughout its range in the eastern United States because of the invasion of an non-native forest pest, Adelges tsugae (Hemlock Woolly Adelgid). This pest kills infected trees, and over time, infected stands are replaced by deciduous forests. The conversion of forests from Hemlock to deciduous species is predicted to impact the hydrology, chemistry, and biology of associated headwater streams. In this study, we examined the macroinvertebrate communities of two adjacent headwater streams with differing Hemlock influence in central Massachusetts. Abundance, taxa richness, diversity, and unique taxa were generally greater in the deciduous stream. Differences in the distribution of functional feeding groups were observed: the Hemlock stream had a greater percentage of collector-gatherers while the deciduous stream had a greater percentage of shredders and predators. These findings suggest that macroinvertebrate communities in streams draining Hemlock and deciduous watersheds may differ in structure and function, and that anticipated Hemlock mortality may impact the region’s stream ecology.
hemlock
hemlock woolly adelgid
macroinvertebrates
stream ecology
LTER controlled vocabulary
disturbance
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=hf121
Prospect Hill Tract (Harvard Forest). Coordinates based on WGS84 datum.
-72.20
-72.17
+42.55
+42.53
280
420
meter
2005
2007
genus
Tsuga
species
canadensis
eastern hemlock
genus
Adelges
species
tsugae
hemlock woolly adelgid
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
Field collection
Invertebrate samples were taken from four randomly chosen locations in each stream during a two-week period in late July and early August of 2005. At each location, one sample was taken from the nearest riffle area and one from the nearest depositional area; thus, eight samples were taken from each stream. Moss was sampled when present on the substratum. Peak emergence of insects usually occurs in early to late spring; hence, it is likely that our sampling regime underestimated the abundance, richness, and diversity of
the streams’ macroinvertebrate communities. Samples were taken by thoroughly disturbing the substrate within a 0.25-m2 quadrat for a 30-second period and collecting all dislodged material in standard D-frame kick nets (250-μm mesh) placed downstream. Samples were live-picked, with care being taken to collect all sizes of specimens.
Laboratory methods and analysis
In the laboratory, invertebrates were sorted and identified to the genus level (with the exception of Chironomidae, which were identified to the subfamily/tribe level) using dissecting and compound microscopes. Taxa were then segregated among the grazer, shredder, collector-gatherer, collector-filterer, and predator functional feeding groups based on the ecological information known
for each taxon (Merritt and Cummins 1996, Stewart et al. 1993, Wiggins 2000). In addition, taxa unique to each stream were identified. We calculated mean abundance (number of specimens/m2), richness (number of taxa/sample), and Shannon’s diversity index of macroinvertebrates in each stream and compared them using a Student’s t-test. In addition, the composition of the two streams was compared at the order level and among functional feeding groups.
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.
hf121-01-abundance.csv
macroinvertebrate abundance
hf121-01-abundance.csv
2009
5ba02dbe92185d086a25dce7f4bdf5f5
1
\r\n
column
,
https://harvardforest.fas.harvard.edu/data/p12/hf121/hf121-01-abundance.csv
species
species name
species name
order
order name
order name
group
functional feeding group
functional feeding group
hemlock
mean abundance for hemlock stream
number
0.1
real
NA
missing value
deciduous
mean abundance for deciduous stream
number
0.1
real
NA
missing value
48
watershed
short-term measurement
https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf095
https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf034
https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf064