Details and Metadata

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Methods

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

Past Methods (No longer in use)

  • Fish sampling locations
    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, including water temperature and specific conductance, during each sampling event.

  • Fish electroshocking
    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.

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

    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.

  • Measurements
    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.

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

Measurement type: Ratio
Units:
Precision: 0.001
cl +95%Conf level +95%

95 percent confidence level

Measurement type: Ratio
Units:
Precision: 0.00001
cl -95%Conf level -95%

95 percent minus confidence level

Measurement type: Ratio
Units:
event IDevent ID

Identification code for fish sampling event

Measurement type: Nominal
N/100m^2N/100m^2

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

Measurement type: Ratio
Units:
pp

probability

Measurement type: Ratio
Units:
run 1run 1

Number of fish captured in first electrofishing pass

Measurement type: 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.

Measurement type: Ratio
Units:
run 2run 2

Number of fish captured in second electrofishing pass

Measurement type: Interval
Units:
run 3run 3

Number of fish captured in third electrofishing pass

Measurement type: Interval
Units:
run 4run 4

Number of fish captured in fourth electrofishing pass

Measurement type: Interval
Units:
sese

standard error

Measurement type: Ratio
Units:
stationstation

Specific location code for sampling event

Measurement type: Nominal
stream namestream name

stream name

Measurement type: Nominal
totaltotal

Total number of fish captured

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

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

Measurement type: Ratio
Units:
x2x2

x2

Measurement type: 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.