Details and Metadata

Printer-friendly version     View XML version    Download Ecological Metadata Language file


Methods

The methods followed in the creation of the dataset, including description of field, laboratory and processing steps, and quality control procedures

Current Methods



  • Efforts were made to seek out and sample all littoral habitat types at each lake- silt-muck, sand, gravel-cobble-rock, organic detritus, logs and submergent and emergent vegetation. The littoral zone was sampled because it should yield the greatest number of species, the most valued fish food organisms, is less influenced by other natural limiting factors than the profundal zone, and was a zone common to all the lakes.

Past Methods (No longer in use)


  • Started: 1993-04-01
    Ended: 1995-10-01

    All individuals were identified to species and salmonids measured for total length. For the Winhall site, all species were weighed individually or in groups, and total lengths were measured.


  • Started: 1993-04-01
    Ended: 1995-10-01

    Stream fish populations were sampled by electroshocking at six sites on four streams: 2 sites each on Lye and Bourn Brooks and 1 site each on Branch Pond Brook and Winhall River. Surveys were done during August and September. Stream sections were representative of the physical habitat in each of the overall stream reaches. General physical characteristics were recorded at each site. Water temperature and specific conductance were taken during each sampling event.


  • Started: 1993-04-01
    Ended: 1995-10-03

    Fish were sampled in an upstream direction using block nets at some sites. At sites where no nets were used, the upper end of the section was located at the foot of a cascade which acted as a barrier to fish attempting to escape the electric field.

Dataset Fields

Detailed documentation of the fields comprising the dataset, including the type of measurement, units where applicable, and any controlled vocabularies or code lists present in the data


Field Name Caption Description Additional Information
% Composition% Composition

The percent composition of a fish species (total number of a particular species divided by total num

Ratio Units:
cl +95%cl +95%

95 percent confidence level

Ratio Units:
cl -95%cl -95%

95 percent confidence level

Ratio Units:
event IDevent ID

Identification code for fish sampling event

Nominal
N/100m^2N/100m^2

A measure of density using the total number of fish caught divided by area.

Ratio Units:
pp

probability

Ratio Units:
run 1run 1

Number of fish captured in first electrofishing pass

Interval Units:
Run 1/100m^2Run 1/100m^2

A measure of density using the total number of fish from one electrofishing pass divided by area.

Ratio Units:
run 2run 2

Number of fish captured in second electrofishing pass

Interval Units:
run 3run 3

Number of fish captured in third electrofishing pass

Interval Units:
run 4run 4

Number of fish captured in fourth electrofishing pass

Interval Units:
sese

standard error

Ratio Units:
stationstation

Specific location code for sampling event

Nominal
stream namestream name

stream name

Nominal
totaltotal

Total number of fish captured

Interval Units:
total/100m^2total/100m^2

A relative density measure (number of fish captured per 100 square meters)

Ratio Units:
x2x2

x2

Ratio Units:

Sampling Equipment

Equipment and software used to collect data, including how that equipment was used.

Past Sampling Equipment (No longer in use)

  • Electroshockers
    Started: 1993-04-01
    Ended: 1995-10-03

    Pulsed-DC backpack electroshockers

Site Characteristics

The spatial extent of the dataset site coverage, and descriptions of the spatial extent and context for the data collection

  • Site Description

    Four streams sampled: Lye Brook, Bourn Brook, Branch Pond Brook and Winhall River.

  • Site Description

    Elevations ranges from 840 feet to 2161 feet.