Substrate and cover types on the stream bottom determined by point transects for streams near the Toolik Field Station, Alaska, for 2010.


The Changing Seasonality of Arctic Stream Systems (CSASN) was active from 2010 to 2012. The CSASN goal was to quantify the relative influences of through flow, lateral inputs, and hyporheic regeneration on the seasonal fluxes C, N, and P in an arctic river network, and to determine how these influences might shift under seasonal conditions that are likely to be substantially different in the future. Point transects were done throughout the sampling season to determine different substrate and cover types on the stream bottom.

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Bowden, W. 2013. Substrate and cover types on the stream bottom determined by point transects for streams near the Toolik Field Station, Alaska, for 2010. Environmental Data Initiative.

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Friday, September 10, 2010 to Wednesday, July 28, 2010

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Data was acquired using point transects (Bowden et al. 1994, Bowden et al. 2006). A number of transects were established across the river at ever sampling station. The transect locations were not permanently monumented and so for sites that were revisited several times a year or over many years, the exact location of the transects vary somewhat. While useful information is contained in the individual transects, statistical comparisons should typically be based on the mean cover values for all transects done at a site as the fundamental reporting unit. At intervals of about 10 cm or 20cm along each transect, the substrate and cover type were noted.

In 2010 and 2011, transects were completed for both I8Out and I8In. Significant amounts of didymo were recorded on these reaches. A "thickness qualifier" was approximated estimating how thick the didymo was. Sporadic Didymo was given a "0" rating; thin didymo (<5mm) was given a "1" rating, and thick (>5mm) was given a "2" rating. The values present in this file show what percentage of the total didymo fell into each category for every individual transect.

Exposed rock above the present water level within a transect was counted throughout all the reaches, but removed for this file. Mosses such as Schistidium, Solenostoma, and Hygrohypnum were analyzed individually on the Kuparuk River in 2012. In terms of simplicity, these three were consolidated into the moss category. Lemanea was put in the same category as Green Filamentous Algae (GF). Other findings included Orthocladius, vascular plants, and Phormidium. These were placed in the "Other" category. If you wish to have these more detailed parameters about the Kuparuk River, please refer to the LTER Moss Transect file currently named "19932010Kuparuk_Moss". This file is updated every year.

Any measured site is a representative sample of the reach from which it came. The dataset contains the "actual" station location information.
Arctic LTER Streams Protocol, updated 2010 by EBS

Version Changes: 

No more updates. Project completed in 2012.
Organized and Prepared by J. Benes: Nov. 2013
Version 2: File path reset, key words updated (JD.Dec2013)
Version 3: Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 15Jan14
Version 4: Added a longer title. Jim L 24Jan14
Version 5 check sites locations Jim L Oct2015

Sites sampled.

Full Metadata and data files (either comma delimited (csv) or Excel) - Environmental Data Initiative repository.

Use of the data requires acceptance of the data use policy --> Arctic LTER Data Use Policy