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Comparison of macroinvertebrate samplers and the relationship of environmental factors to biomass and diversity variability in a small watershed. Research technical completion report, project no. A-049-IDA Item Info

Variability in macroinvertebrate biomass and diversity between streams in a relatively undisturbed watershed was determined by sampling at 19 stations in first through fourth order streams of the Horse Creek drainage, Idaho. Macroinvertebrate biomass and diversity values varied significantly (P<.05) both between different stream orders, and between streams of the same order. Biomass and diversity variability was correlated with physical and chemical factors by stepwise regression analysis. A large percentage (>85%) of the variance in both biomass and diversity was accounted for by changes in four to five physical and chemical factors, which included substrate size, gradient, suspended sediment water temperature, alkalinity, stream order and width. This indicates that predictive modeling of macroinvertebrate community structure is possible in a small, relatively undisturbed watershed. Basket, multiple-plate and Surber macroinvertebrate samplers were used to determine which sampler is most applicable for use in small relatively undisturbed streams. Comparisons were made on the basis of sample biomass) diversity and taxonomic composition. Basket samples had more biomass and higher diversity than multiple-plate samples throughout the watershed, probably because they provided a better imitation of the natural substrate. Basket sample diversities were similar to Surber sample diversities in first and second order streams, but were much lower in third and fourth order streams. Both basket and multiple-plate samplers were found to be adequate for stream survey work. The inconsistancies found with Surber samplers indicated that they were most applicable only when time and resources were at a minimum, or when sampling was designed only to determine which taxa were present at a given site.

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Title:
Comparison of macroinvertebrate samplers and the relationship of environmental factors to biomass and diversity variability in a small watershed. Research technical completion report, project no. A-049-IDA
Authors:
Newlon, Thomas A.; Rabe, Fred W.
Date Created (ISO Standard):
1977-01
Description:
Variability in macroinvertebrate biomass and diversity between streams in a relatively undisturbed watershed was determined by sampling at 19 stations in first through fourth order streams of the Horse Creek drainage, Idaho. Macroinvertebrate biomass and diversity values varied significantly (P<.05) both between different stream orders, and between streams of the same order. Biomass and diversity variability was correlated with physical and chemical factors by stepwise regression analysis. A large percentage (>85%) of the variance in both biomass and diversity was accounted for by changes in four to five physical and chemical factors, which included substrate size, gradient, suspended sediment water temperature, alkalinity, stream order and width. This indicates that predictive modeling of macroinvertebrate community structure is possible in a small, relatively undisturbed watershed. Basket, multiple-plate and Surber macroinvertebrate samplers were used to determine which sampler is most applicable for use in small relatively undisturbed streams. Comparisons were made on the basis of sample biomass) diversity and taxonomic composition. Basket samples had more biomass and higher diversity than multiple-plate samples throughout the watershed, probably because they provided a better imitation of the natural substrate. Basket sample diversities were similar to Surber sample diversities in first and second order streams, but were much lower in third and fourth order streams. Both basket and multiple-plate samplers were found to be adequate for stream survey work. The inconsistancies found with Surber samplers indicated that they were most applicable only when time and resources were at a minimum, or when sampling was designed only to determine which taxa were present at a given site.
Subjects:
macroinvertebrates biomass species diversity natural streams
Location:
Horse Creek Drainage
Latitude:
45.95
Longitude:
-115.33
Collection:
IWRRI
Series:
Water for Idaho
IWRRI number:
197715
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
Publisher:
University of Idaho
Contributing Institution:
University of Idaho
Type:
Text
Format:
application/pdf
Cataloger:
wbv
Date Digitized:
2012

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Preferred Citation:
"Comparison of macroinvertebrate samplers and the relationship of environmental factors to biomass and diversity variability in a small watershed. Research technical completion report, project no. A-049-IDA", Idaho Waters Digital Library, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/iwdl/items/iwdl-197715.html
Rights
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
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