Plum Island Ecosystems LTER Database

Acceptance and utilization of LTER data requires that:

(1) The Principal Investigator be sent a notice stating reasons for acquiring any data and a description of the publication intentions.
(2) The Principal Investigator of the data set be sent a copy of the report or manuscript prior to submission and be adequately cited in any resultant publications.
(3) A copy of any resultant publications should be sent to:

Principal Investigator
Ecosystems Center
Marine Biological Laboratory
7 MBL St.
Woods Hole, MA 02543

Dataset URLs:METADATA: HTML, Rich Text, XML(EML compliant)
DATA: Comma Delimited, Excel file with Metadata and data
Dataset ID:HTL-EST-Clam-isotopes.02
Dataset Title:Stable isotopes of Mya arenaria during 2010 and 2011 to determine food sources
Investigator 1: 
First Name:Chuck
Last Name:Hopkinson
Address line 1:University of Georgia
Address line 2:229 Marine Sciences
Address line 3:
City:Athens
State:GA
Zip Code:30602
Country:USA
Associate Investigators:Kyung-Ah Koo, Emily Davenport
Keywords:LTER, PIE, Plum Island Ecosystems, population dynamics, softshell clam, isotopes
Abstract:Several sites in Plum Island Sound, the mainstem of the Parker River and Rowley River were selected and sampled during 2010 and 2011 for 2 and 4 inch intertidal clams on a monthly basis. The tissue of these clams were analyzed for stable isotopes to determine the food source of these clams. Water samples were also filtered and plants were collected to determine their isotopic composition as well.
Contact: Plum Island Ecosystems LTER Information Manager
The Ecosystems Center
Marine Biological Lab
7 MBL St
Woods Hole, MA 02543
Phone (508) 289 7485
Email: pie_im@mbl.edu
Online URL: http://pie-lter.ecosystems.mbl.edu
DATA FILE INFORMATION:
Data File URL http://ecosystems.mbl.edu/PIE/data/HTL/data/HTL-EST-Clam-isotopes.csv
Data File Name HTL-EST-Clam-isotopes
Beginning Date 6/17/2010
End Date 4/23/2011
Number of Data Records 93
Other Files to Reference HTL-EST-Clam-densitysediment, HTL-EST-Clam-chlorophyll, HTL-EST-Clam-growth, HTL-EST-Clam-lengthweight
Availability Status Type 1
Quality Control Information
Maintenance Description Data complete for 2011
Log of Changes: Version 01: October 22, 2015, data and metadata created to comply with importation to Drupal and LTER PASTA. Used MarcrosExportEML_HTML (working)pie_excel2007_Jan2015.xlsm 1/15/15 4:26 PM for QA/QC to EML 2.1.0
Version 02: February 25, 2016, corrected Parker-Clams lat/long to be at Parker Dam not Ipswich Dam, data and metadata updates to comply with importation to Drupal and LTER PASTA. Used MarcrosExportEML_HTML (working)pie_excel2007_Jan2015.xlsm 1/15/15 4:26 PM for QA/QC to EML 2.1.0
 
RESEARCH LOCATION: HTL-PR-Parker-Clams HTL-PR-MR-Clams HTL-PR-RR-Clams HTL-SO-GF-Clams HTL-SO-Stackyard-Clams HTL-RO-RM-Clams HTL-SO-TL-Clams HTL-SO-IB-Clams HTL-SO-Offshore-Clams HTL-RO-Clubmouth-Clams HTL-RO-Sweeneymouth-Clams HTL-RO-RowleyHouse-Clams  
Geographic Description Site of clam surveys at the Parker River Dam, Newbury, MA Site of clam surveys at confluence of Mill River with Parker River, Newbury, MA Site of clam surveys near railroad bridge on Parker River, Newbury, MA Site of clam surveys, alias "Grandkids Flat", southeast of Cape Merrill in Plum Island Sound, Newbury, MA Site of clam surveys, end of Stackyard Rd, east of Nelson Island, in Plum Island Sound, Newbury, MA. Site of clam surveys, near kite flag pole, mouth of Rowley River, Rowley, MA Site of clam surveys, Third Creek, south of Roger Island River, Plum Island Sound, Ipswich, MA. Site of clam surveys, Ipswich Bluff flats, east of Ipswich Bay Yacht Club, Plum Island, Ipswich, MA. Site of clam surveys, in Atlantic ocean just offshore from Ipswich Bay, Plum Island, Ipswich MA Site of clam surveys, mouth of Clubhead Creek, off Rowley River, Rowley, MA Site of clam surveys, mouth of Sweeney Creek, off Rowley River, Ipswich, MA Site of clam surveys, tidal flat near PIE LTER Rowley field station, Rowley, MA.  
Location Bounding Box                          
West Bounding Coordinate                          
East Bounding Coordinate                          
North Bounding Coordinate                          
South Bounding Coordinate                          
OR if single point location                          
Latitude 42.749903 42.755183 42.760367 42.7483 42.74625 42.727133 42.7518 42.70875 42.70544185 42.732018 42.727844 42.725367  
Longitude -70.929075 -70.872083 -70.86325 -70.810983 -70.8219 -70.81515 -70.81635 -70.7859 -70.74185558 -70.83836 -70.84776 -70.85495  
Elevation                          
                           
                           
 
TAXONOMIC COVERAGE:
Taxonomic Protocols
Organisms studied Mya arenaria
 
Methods:Several sites in Plum Island Sound, the mainstem of the Parker River and Rowley River were selected and sampled for 2 and 4 inch clams on a monthly basis (clams selected were intertidal, meaning they were collected at low tide due to being covered by water at high tide). 20 clams 2" in length and 20 clams 4" in length were collected at each site monthly, and frozen for later isotopic analysis. In the lab, these clams were dissected and their adductor muscles removed (adductor muscles were selected because the muscle tissue would give the best representation of long term food sources rather than a brief snapshot if stomach tissue were selected). The muscles of the clams were freeze dried and then ground together using a ball mill. The tissue samples were then weighed out on a microbalance into tins for isotope analysis (deuterium (H), carbon (C), nitrogen (N) and sulfur (S)). Northern Arizona University's isotope lab performed the analyses

Water samples were also filtered at several clam collection sites and plants were collected to determine their isotopic composition . Filters were sent directly to Northern Arizona University for analysis. Plant samples were freeze dried and ground in a ball mill, then weighed into tins and sent to Northern Arizona University for analysis.

Data Table

Variable Name Variable Description Units Measurement Scale Code Information Number Type DateTime Format Missing Value Code Missing Value Code Explanation
Date Date of sampling   datetime     DD-MON-YYYY NA NA = not available
Station_ID Name of sampling station   nominal       NA NA = not available
Sample_ID Name of individual sample   nominal       NA NA = not available
Latitude Latitude of sampling station (decimal degrees) degree ratio   real   NA NA = not available
Longitude Longitude of sampling station (decimal degrees) degree ratio   real   NA NA = not available
Type Type of sample- clam, filter, plant   nominal       NA NA = not available
Size Size of clam - 2 or 4 inches long (converted to centimeters) centimeter ratio   real   NA NA = not available
d2H measure of the ratio of hydrogen stable isotopes 2H:1H partPerThousand ratio   real   NA NA = not available
d13C measure of the ratio of carbon stable isotopes 13C:12C partPerThousand ratio   real   NA NA = not available
d15N measure of the ratio of nitrogen stable isotopes 15N:14N partPerThousand ratio   real   NA NA = not available
d34S measure of the ratio of sulfur stable isotopes 34S:32S partPerThousand ratio   real   NA NA = not available