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Horizontal dispersion and density of limnetic crustaceans in four sub-alpine lakes Item Info

Limnetic crustaceans from four subalpine lakes in northeast Idaho were studied during the summers of 1966 and 1967. Four methods were used to take quantitative vertical plankton samples. These collections were used for comparison of lakes, comparison of sampling methods within lakes, and comparison of sample sizes. The four lakes were similar in having a simple species composition and low density of limnetic crustaceans. For all samples Fisher's coefficient of dispersion S2/X-bar was computed and used as a measure of horizontal dispersion. Mean total crustacean density and dispersion appeared to approximate taxa density and dispersions. Data for all comparisons were based on the density and horizontal dispersion of mean total crustaceans. The meadow lakes had higher densities of limnetic crustaceans than the headwall lakes, 1966 and 1967. There was an indication that a positive linear relationship existed between total crustacean density and coefficient of dispersion when sampled by different methods in each of the four lakes. Similarities of total crustacean density and dispersion estimates from different methods and sample sizes was attributed to the low density in limnetic regions. Reliability of data was possibly affected by small sample sizes and avoidance behavior of crustaceans to samplers.

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Title:
Horizontal dispersion and density of limnetic crustaceans in four sub-alpine lakes
Authors:
Wissmar, Robert Charles
Date Created (ISO Standard):
1968-05
Description:
Limnetic crustaceans from four subalpine lakes in northeast Idaho were studied during the summers of 1966 and 1967. Four methods were used to take quantitative vertical plankton samples. These collections were used for comparison of lakes, comparison of sampling methods within lakes, and comparison of sample sizes. The four lakes were similar in having a simple species composition and low density of limnetic crustaceans. For all samples Fisher's coefficient of dispersion S2/X-bar was computed and used as a measure of horizontal dispersion. Mean total crustacean density and dispersion appeared to approximate taxa density and dispersions. Data for all comparisons were based on the density and horizontal dispersion of mean total crustaceans. The meadow lakes had higher densities of limnetic crustaceans than the headwall lakes, 1966 and 1967. There was an indication that a positive linear relationship existed between total crustacean density and coefficient of dispersion when sampled by different methods in each of the four lakes. Similarities of total crustacean density and dispersion estimates from different methods and sample sizes was attributed to the low density in limnetic regions. Reliability of data was possibly affected by small sample sizes and avoidance behavior of crustaceans to samplers.
Subjects:
Crustaceans
Latitude:
46.85
Longitude:
-115.49
IWRRI number:
196821
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:
Jodi Haire
Date Digitized:
2008-03-27

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Source
Preferred Citation:
"Horizontal dispersion and density of limnetic crustaceans in four sub-alpine lakes", Idaho Waters Digital Library, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/iwdl/items/iwdl-196821.html
Rights
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
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