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:MAR-VA-Porewater.02
Dataset Title:Porewater nutrient concentration data [SRP, NH4+, S-2, Cl-] from several sites along the Rowley and Parker Rivers, MA and Wells NEER, ME.
Investigator 1: 
First Name:Jim
Last Name:Morris
Address line 1:Dept of Biological Sciences
Address line 2:
Address line 3:University of SC
Zip Code:29208
Associate Investigators:Robert J. Daoust
Keywords:PIE LTER, inorganic nutrients, disturbance, Spartina alterniflora, Spartina patens, Typha, macrophyte, ammonium, chloride, sediment, marsh, phosphorus, sulfide, salinity, porewater
Abstract:Porewater nutrient concentration data [SRP, NH4+, S-2, Cl-] from several sites along the Rowley and Parker Rivers, MA and Wells NEER, ME.
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 MAR-VA-Porewater
Beginning Date 11/1/1998
End Date 10/26/2000
Number of Data Records
Other Files to Reference
Availability Status Type 1
Quality Control Information
Maintenance Description
Log of Changes: Version 01, initial Excel metadata entry
Version 02, 20Jan2010, keyword update
RESEARCH LOCATION: Site 1 Site 2 Site 3 Site 4 Site 5 Site 6 Site 7  
Geographic Description LTE-MP-LPA LTE-MP-LPP LTE-MP-ORT MAR-RO-LawTr MAR-RO-MorrisTr MAR-PR-PD MAR-WM-Little  
Location Bounding Box                
West Bounding Coordinate                
East Bounding Coordinate                
North Bounding Coordinate                
South Bounding Coordinate                
OR if single point location                
Latitude 42.73174171 42.75673837 42.73095384          
Longitude -70.84247191 -70.91771675 -70.84291486          
Taxonomic Protocols
Organisms studied Spartina alterniflora; Spartina patens; Typha sp.
Methods:Porewater is sampled monthly from May through November and bi-monthly from December though April using diffusion samplers. Samples are retrieved from triplicate poles at depths of 10, 25, 50, 75, and 100 cm. Soluble reactive phosphorus, NH4, S2, and chloride concentrations are measured in each sample according to standard laboratory protocols (SRP and NH4 – Strickland and Parson (1972); S2 – Otte and Morris (1994)).

NOTES AND COMMENTS: MAR-RO-MorrisTr discontinued on 7/1/99. LTE-MP-LPP began in May 99. LTE-MP-ORT began in May 00. TYC1 and TY11 are the same sampling pole.

Otte, M. L. and J. T. Morris (1994). Dimethylsulphoniopropionate (DMSP) in Spartina alterniflora Loisel. Aquatic Botany 48:239-259.
Strickland, T. D. and T. R. Parsons. 1972. A Practical Handbook of Seawater Analysis. Fisheries Research Board of Canada, Ottawa, Ontario, Canada.

Locations of Porewater Peepers. (Please note that stations were renamed to fit with the PIE-LTER station naming protocol. Previous names are listed in the table below for reference.)
LTE-MP-LPA = Law’s Point low marsh (Spartina alterniflora dominated) plot-level marsh fertilization experimental site
LTE-MP-LPP = Law’s Point high marsh (Spartina patens dominated) plot-level marsh fertilization experimental site
LTE-MP-ORT = Upper Parker River Typha sp. dominated marsh plot-level marsh fertilization experimental site
MAR-RO-LawTr = Law’s Point transect, 100 m from creekbank inland, Loc for this site corresponds to meters from creekbank
MAR-RO-MorrisTr = Morris Island transect
MAR-PR-PD = Freshwater marsh immediately behind the Parker River Dam
MAR-WM-Little = Wells, ME NEER site along Little River

LTE-MP-LPA LPA 42.73174171 70.84247191
LTE-MP-LPP LPP 42.75673837 70.91771675
LTE-MP-ORT TY 42.73095384 70.84291486
MAR-RO-MorrisTr MI
MAR-WM-Little WM

Data Table

Variable Name Variable Description Units Measurement Scale Code Information Number Type DateTime Format Missing Value Code Missing Value Code Explanation
YR Year of sample collection   datetime     yyyy   blank cell
MTH Month of sample collection   datetime     mm   blank cell
DAY Day of sample collection   datetime     dd   blank cell
SIT Site of sample collection   nominal         blank cell
LOC Sample location, in many cases this depends completely on sample site   nominal CK = creek surface water sample | RT = water collected while draining from creekbank | PD = pond surface water sample | Numbers > 3 = a distance in meters along a transect with 0 m located at the creekbank | Numbers (1 or 2 or 3) = a position along an unsurveyed transect | C = samples collected at experimental sites from control unfertilized plots | F = samples collected at experimental sites from N+P fertilized plots       blank cell
REP Replicate number, in some case diffusion sampler are set alone (1 rep), in pairs (2 reps), or in triplicates (3 reps)   nominal         blank cell
DPT Sample depth (10, 25, 50, 75, 100) 0 = surface water sample centimeter ratio   real     blank cell
SRP soluble reactive phosphorus concentration, uM-P microMolesPerLiter ratio   real     blank cell
NH4 ammonium concentration, uM-N microMolesPerLiter ratio   real     blank cell
S2 sulfide concentration, uM-S microMolesPerLiter ratio   real     blank cell
Cl chloride concentration gramsPerLiter ratio   real     blank cell
SAL salinity percent ratio   real     blank cell