Gastropod abundance at Hubbard Brook Experimental Forest, Watershed 1 and West of Watershed 6, 1997-2006
TITLE
Gastropod abundance at Hubbard Brook Experimental Forest, Watershed 1 and West of Watershed 6, 1997-2006
PRINCIPAL INVESTIGATOR(s)
Steven Hamburg
Environmental Defense Fund
18 Tremont Street, Suite 850
Boston, MA 02108
USA
OTHERS INVOLVED
Matthew Vadeboncoeur
Monica Skeldon
ABSTRACT:
Snail and slug abundance were measured for a 10 year period between 1997 - 2006 at three elevations on Watershed 1 as well as in a reference area west of Watershed 6. Watershed 1 received calcium additions as wollastonite (CaSiO3) during the study period. This data set includes counts of snails and and slugs for the entire study period.
KEYWORD SET: Hubbard Brook Ecosystem Study LTER
calcium amendment, gastropod, HBEF Watershed 1, HBEF Watershed 6, HBR, Hubbard Brook LTER, organism, slug, snail.
KEYWORD SET: LTER Core Research Areas
organisms.
BEGIN DATE
1997-07-12
END DATE
2006-07-29
LOCATION
Watershed 1
West bounding coordinate: -71.730866
East bounding coordinate: -71.725832
North bounding coordinate: 43.959356
South bounding coordinate: 43.952121
Bear Brook Watershed, west of Watershed 6
West bounding coordinate: -71.743462
East bounding coordinate: -71.735649
North bounding coordinate: 43.957001
South bounding coordinate: 43.949928
DATA DESCRIPTION
We have assembled a 10-year record (1997-2006) of snail and slug abundance at three elevations on watershed 1, which was treated with Ca in 1999, as well as in a reference area west of watershed 6. Total snail abundance increased over the time series in both watersheds, but the increase was much more significant on watershed 1. Slug abundance did not change significantly over the time series in either watershed.
The most commonly encountered snails included Discus catskillensis; Striatura exigua; and Zonitoides arboreus. Slugs were not identified to species.
SAMPLING DESIGN
Snails were collected once in the summer of 1997 and twice each summer from 1998 thru 2006, using the cardboard sheet method (Hawkins et al. 1998; Boag 1982), which produces acceptably representative samples of the gastropod community in northern hardwood forests (Strayer et al. 1986).
Cardboards 0.56m2 in area were deployed in a systematic grid on the forest floor at three elevations (520m, 610m, and 700m) both in W1 and west of W6 each June. The location of each cardboard was flagged to allow its reuse each year (within a few meters), and cardboards were only placed on an intact litter layer, avoiding the exact location of the previous year's cardboard.
Snails were collected from the underside of each cardboard in early July and early August, one to two days after a >7 mm rain event, so that the cardboards were still moist but not saturated at the time of collection. Only snails adhering directly to the cardboard were collected; those in leaf litter stuck to the cardboard were not collected due to the highly variable amount of litter adhering to each cardboard. Slugs were counted, but not collected.
Snails samples, preserved in 95% ethanol, are stored in Steven Hamburg's lab at Brown University.
REFERENCES
  • Boag, D.A. 1982. Overcoming sampling bias in studies of terrestrial gastropods. Canadian Journal of Zoology 60:1289-1292.
  • Hawkins, J.W., Lankester, M.W., and Nelson, R.R.A. 1998. Sampling terrestrial gastropods using cardboard sheets. Malacologia 39:1-9.
  • Skeldon, M.A., Vadeboncoeur, M.A., Hamburg, S.P., and Blum, J.D. 2007. Terrestrial gastropod responses to an ecosystem-level calcium manipulation in a northern hardwood forest. Canadian Journal of Zoology 85:994-1007.
  • Strayer, D., Pletscher, D.H.., Hamburg, S.P., and Nodvin, S.C. 1986. The effects of forest disturbance on land gastropod communities in northern New England. Canadian Journal of Zoology 64:2094–2098.
DATA ACCESS GUIDELINES
Data Use Policy



The re-use of scientific data has the potential to greatly increase communication, collaboration and synthesis within and among disciplines, and thus is fostered, supported and encouraged. Permission to use this dataset is granted to the Data User free of charge subject to the following terms:

1) Acceptable use. Use of the dataset will be restricted to academic, research, government or other not-for-profit professional purposes.

2) Redistribution. The data and metadata are provided for use by the Data User. The Data User will not redistribute the original Data Set or metadata to others without the explicit permission of the Principal Investigator.

3) Citation. It is considered a matter of professional ethics to acknowledge the work of other scientists. Thus, the Data User will properly attribute the Data Set in any publications or in the metadata of any derived data products that were produced using the Data Set. Citation should take the following general form: Creator, Year of Data Publication, Title of Dataset, Publisher, Dataset identifier.

Citation example: Holmes, R.T. 2012. Bird Abundances at Hubbard Brook (1969-2010) and on three replicate plots (1986-2000) in the White Mountain National Forest. Durham, NH. Hubbard Brook Data Archive [Database]. http://hubbardbrook.org/data/dataset.php?id=81 (23 July 2012)

4) Acknowledgment: The Data User should acknowledge any institutional support or specific funding awards referenced in the metadata accompanying this dataset in any publications where the Data Set contributed to its content. Acknowledgments should identify the supporting party, the party that received the support, and any identifying information such as grant numbers.

Acknowledgment example: Data on [topic] were provided by [name of PI] on [date]. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station, Newtown Square, PA. Significant funding for collection of these data was provided by [agency]-[grant number], [agency]-[grant number], etc.

5) Consultation and questions. Data users are strongly encouraged to consult with the Principal Investigator(s) who collected these data for further information. Also, when appropriate, Data Users should consider including the Principal Investigator as a collaborator and/or co-author in the use of these data.

6) Notification. The Data User will notify the Principal Investigator of any publication or derivative work based on the Data Set. The Data User will also provide the Principal Investigator and/or the administrator of the Hubbard Brook Ecosystem Study with a pdf or two reprints of any publication(s) resulting from use of the Data Set.

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CONTACT PERSON

Information Manager, Hubbard Brook LTER
234 Mirror Lake Road
North Woodstock, NH 03262
USA

Phone: (603) 726-8902
Email: hbr-im@lternet.edu

Data file: gastropods.txt
Description: Gastropod abundance on Watershed and west of Watershed 6, 1997-2006, Hubbard Brook Expermental Forest
ColumnVariableDescriptionUnitsCoded?Missing value label
1DATEDate of observationYYYY-MM-DDn
0000-00-00
2WATERSHEDWatershed of observation (W1 was treated with wollastonite in fall 1999; the area west of W6 is untreated, and used as a reference.)noneynone
3ELEV_BANDElevation band (n = 3 per watershed)noneynone
4CARDBOARDcardboard number (n=15 per elevation band)noneynone
5N_SNAILSNumber of snails observednumbern
-9999
6N_SLUGSNumber of slugs observednumbern
-9999

CODES

Variable: WATERSHED
Description:
Watershed of observation
Variable: ELEV_BAND
Description:
Elevation band
Variable: CARDBOARD
Description:
cardboard number

MISSING VALUE CODES
Variable
Missing Value Code
Code Explanation
DATE
0000-00-00
Unkown date
N_SNAILS
-9999
Data missing or not taken
N_SLUGS
-9999
Data missing or not taken