Dataset 819
BioNet Biological Assessment Database - Macroinvertebrate Survey (Low-Flow Artificial Substrate Samples)
Realm: Freshwater
Climate: Temperate
Biome: Multiple Central latitude: 42.171690
Central longitude: -94.303030
Duration: 6 years, from 2011 to 2016
Climate: Temperate
Biome: Multiple Central latitude: 42.171690
Central longitude: -94.303030
Duration: 6 years, from 2011 to 2016
154 records
59 distinct species
Across the time series Chironomidae is the most frequently occurring speciesMethods
GENERAL: Stream biological sampling is completed from July 1 - October 15 while stream flow levels are relatively stable. The length of stream segment sampled ranges from 5001150 feet, depending on the stream width and how frequently stream habitat features are repeated. Sampling frequency ensures that important habitat niches utilized by benthic macroinvertebrates and fish are adequately represented. Two types of benthic macroinvertebrate samples are collected: standard habitat and multi-habitat. Specific types of sampling gear are used to collect standard-habitat samples from rock or wood surfaces in flowing areas of the stream. A Hess sampler or a Surber sampler is used to sample benthic macroinvertebrates in streams which have riffles comprised of gravel and cobble substrates. Artificial habitats constructed of small, wood plates are used in streams which lack riffle habitat. The multi-habitat sample is collected simply by handpicking organisms from various types of habitat including aquatic vegetation, boulders, leaf packs, overhanging vegetation, root mats, and woody debris. The data from standard and multi-habitat samples estimate how many types of benthic macroinvertebrates are present, and the abundance of each type in relation to the whole sample.” [Extracted from: https://programs.iowadnr.gov/bionet/Docs/About] Semi-quantitative Benthic Macroinvertebrate Sampling Procedures A modified Hess sampler, Surber sampler, or modified Hester-Dendy (multi-plate artificial) substrates, are used to collect the semi-quantitative benthic macroinvertebrate samples. The modified Hess or Surber samplers are used in streams that have productive riffle or run habitat. In streams lacking productive riffle or run habitat, modified Hester-Dendy multi-plate artificial substrates are used for collecting macroinvertebrates. Artificial substrates are routinely deployed during the reconnaissance visit and a 4 to 6 week colonization period is required for their use.” [Extracted from: Biological Sampling and Physical Habitat Assessment Standard Operating Procedure for Iowa Wadeable Streams and Rivers, July 24, 2015. See: https://publications.iowa.gov/20274/] See this source for more detail. SPECIFIC SAMPLES: Low-Flow Artificial Substrate. Each standard AS consists of (8) ?” x 4" x 4" wood plates with ¼” holes drilled in center, (3) ¼”, (3) ½” and (1) ¾” thick spacers made from ½”outside diameter PVC,(2) washers, (1) hex nut, (1) wing nut and (1) ¼” X 18-36” threaded steel rod.” The low flow AS are constructed in two pieces (Rod A and Rod B) using the same materials as the standard AS (see above) except (1) ½” spacer is not used and (2) washers, (2) hex nuts and (2) wing nuts are needed.” Deploy three low flow AS (3 Rod A + 3 Rod B) in the deepest flowing water in the sampling reach with firm substrate (sand or sand/gravel, not silt or muck).” [Extracted from: https://publications.iowa.gov/20274/] See this source for more detail. NOTES: The dataset in BioTIME includes quantitative samples from sites sampled at least two different years. The survey is split into 5 datasets, each containing records monitored with a unique methodology. Grain size is the name of the sampler used for monitoring invertebrates. Abundance units are individual counts.Citation(s)
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