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-lengthweight.01
Dataset Title:Length, weight and organic content of clams (Mya arenaria) during 2010 in the Plum Island Sound estuary, Newbury, Rowley and Ipswich, MA.
Investigator 1: 
First Name:Chuck
Last Name:Hopkinson
Address line 1:University of Georgia
Address line 2:229 Marine Sciences
Address line 3:
Zip Code:30602
Associate Investigators:Kyung-Ah Koo, Emily Davenport
Keywords:LTER, PIE, Plum Island Ecosystems, population dynamics, softshell clam length, softshell clam weight
Abstract:Softshell clams from 5 sites from the mainstem of the Parker River , Plum Island sound estuary and adjacent tidal creeks were measured for length, wet weight, dry weight and organic content in 2010.
Contact: Plum Island Ecosystems LTER Information Manager
The Ecosystems Center
Marine Biological Lab
7 MBL St
Woods Hole, MA 02543
Phone (508) 289 7485
Online URL:
Data File URL
Data File Name HTL-EST-Clam-lengthweight
Beginning Date 5/14/2010
End Date 5/14/2010
Number of Data Records 85
Other Files to Reference HTL-EST-Clam-densitysediment, HTL-EST-Clam-chlorophyll, HTL-EST-Clam-isotopes, HTL-EST-Clam-growth
Availability Status Type 1
Quality Control Information
Maintenance Description Data complete for 2010
Log of Changes: Version 01: September 29, 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
Geographic Description Site of clam surveys, Ipswich Bluff flats, east of Ipswich Bay Yacht Club, Plum Island, Ipswich, MA. Site of clam surveys, Third Creek, south of Roger Island River, Plum Island Sound, Ipswich, MA. Site of clam surveys, alias "Grandkids Flat", southeast of Cape Merrill in Plum Island Sound, Newbury, MA Site of clam surveys near railroad bridge on Parker River, Newbury, MA Site of clam surveys at confluence of Mill River with Parker River, Newbury, MA  
Location Bounding Box            
West Bounding Coordinate            
East Bounding Coordinate            
North Bounding Coordinate            
South Bounding Coordinate            
OR if single point location            
Latitude 42.70875 42.7518 42.7483 42.760367 42.755183  
Longitude -70.7859 -70.81635 -70.810983 -70.86325 -70.872083  
Taxonomic Protocols
Organisms studied Mya arenaria
Methods:Five sampling sites were selected along the flanks of the lower 14 km of the estuary where clams were found
Approximately 7-22 clams were dug at each site and taken back to the lab, where they were measured with calipers to determine their shell length (in millimeters) and wet weight (clam plus shell, grams). The clams were then dried in a drying oven (at 60 degrees Celcius for 24hours at a time) until their weight no longer changed to determine their dry weight (clam plus shell, grams). Several clams were selected to determine their organic content - these clams (and their shells) were ashed in a muffle furnace (at 500 degrees Celcius for 5-6 hours), and the difference between their final ashed weight and dry weight reflects the organic content of the clams.

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
Clam_ID Name of individual clam sampled   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
Length Length of each clam shell millimeter ratio   real   NA NA = not available
Wet_weight Wet weight of clam gram ratio   real   NA NA = not available
Dry_weight Dry weight of clam gram ratio   real   NA NA = not available
Organic_weight Organic content of clam (Dry weight minus Ashed weight = organic content) gram ratio   real   NA NA = not available