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Arctic 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

Older Metadata: Attribute table not in XML (EML) file

Dataset URLs:	METADATA: HTML, Rich Text, XML(EML compliant) DATA: Comma Delimited, Excel file with Metadata and data
Dataset ID:	92bomopt
Dataset Title:	Point transects used to estimate epilithic bryophyte and macroalgal cover of the Kuparuk River, Arctic LTER 1992.
Investigator 1:
First Name:	William
Last Name:	Bowden
Address line 1:
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Associate Investigators:	Jacques Finlay
Keywords:	fertilized, Kuparuk River, control, bryophytes, riffle, epilithic phosphorus, Hygrohypnum, Fontinalis, Schistidium
Abstract:	Point transects used to estimate epilithic bryophyte and macroalgal cover of the Kuparuk River. Hygrohypnum, Fontinalis, and Schistidium were the dominant bryophytes encountered. Transects were done July (early) and July and August (late) in both fertilized (phosphorus-enriched) and control riffles of the Kuparuk.
Contact:	Arctic LTER Information Manager The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole, MA 02543 Phone (508) 289 7496 Email: arc_im@mbl.edu Online URL: http://ecosystems.mbl.edu/ARC/
DATA FILE INFORMATION:
Data File Name	92bomopt
Beginning Date	5/1/1992
End Date	9/1/1992
Number of Data Records
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes:	Log of changes: For Archival Use: DATE RECEIVED: June 1997 DATA FILE ENTERED BY: Karie Slavik DATA FILE VALIDATION: NAME: Karie Slavik DATE: 03Sept97



RESEARCH LOCATION:
Geographic Description	Kuparuk River: Control: riffles from 0.45 to -1.0 km Fertilized: riffles from 1.0 to 18.0 km
Location Bounding Box
West Bounding Coordinate
East Bounding Coordinate
North Bounding Coordinate
South Bounding Coordinate
OR if single point location
Latitude
Longitude



TAXONOMIC COVERAGE:
Organisms studied

Methods:	In 1990 we observed increased abundance's of several species of aquatic bryophytes in the fertilized zone of the Kuparuk River relative to the control. These bryophytes included, most notably, two species of Hygrohypnum, H. alpestre and H. ochraceum, Fontinalis neomexicana, and, to a lesser extent, Schistidium agassizii and the leafy liverwort Solenostoma. Bryophyte biomass collections from random quadrants in control and phosphorus-enriched zones of the Kuparuk River in 1990 and 1991 indicated that there were 17+/-9 gm dry mass per meter squared in the control zone and 322+/-96 gm in the enriched zone (+/-SE, N = 5). To substantiate these data, we utilized point transects in 1992 to estimate bryophyte coverage in the enriched and control zones. To estimate percent coverage, we normally completed 5 transects per riffle site. In each transect, we proceeded at 10 or 20 cm intervals across the width of the stream. At each interval we noted the presence of any epilithic bryophyte or macroalgae beneath a target point on a clear Plexiglas view-scope. If the point appeared bare we noted "bare". "Bare" rocks had epilithic diatom communities that were too small to see with the unaided eye. In early July, we completed transects in the immediate experimental (1 to 6 km) and control (-1 to 0.45 km) zones. In late July and early August, we completed an extensive survey of the river at and downstream of the fertilized zone (2 to 18 km). During the latter time, a survey from -1 to 20 km of phosphorus concentrations and epilithic algal biomass was completed by Nancy Parmentier. These data are contained in other 1992 LTER files. Notes: Percent cover estimates are expressed as averages of all transects (n=5) at each riffle site for each bryophyte and macroalgal species and for total bryophyte coverage. Calculations: Variable Formula Reference Citations: Bowden, W. B., J. C. Finlay, and P. E. Maloney. 1994. Long-term effects of PO4 fertilization on the distribution of bryophytes in an arctic river. Freshwater Biology 32:445-454. Finlay, J. C. and W. B. Bowden. 1994. Controls on production of bryophytes in an arctic tundra stream. Freshwater Biology 32:455-466. Sampling Description. None

Data Table

Precise        Coded?
Variable      Variable description          Units           (Y/N)
SITE          site of measurement                               y
D/D           distance from K or O dripper  0.05 km             n
DATE          date                          ddmmyy              n
LOCATION      location (CONTROL, +P)                            n
SUBSITE       typically POOL or RIFFLE                          n
TRANS         Transect identification                           n
AVERAGE       average percent cover           %                 n
STDEV         standard deviation (n=5)                          n
COMMENTS      data specific comments                            n