Annual production by Gammarus pseudolimnaeus among substrate types in Valley Creek, Minnesota [Stream ecology]

Annual production by Gammarus pseudolimnaeus Bousfield in Valley Creek, Minnesota, was computed, using the size-frequency method, separately by substrate type for the 5-year period, 1968-1972. Four substrate types were identified: sand (θ 0 through 8); sand-gravel (θ-5 through 8); gravel (θ-1 throug...

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Bibliographic Details
Published in:The American midland naturalist 1984-01, Vol.112 (1), p.95-102
Main Author: Waters, Thomas F.
Format: Article
Language:English
Subjects:
Cobbles
Creeks
Ecological life histories
Fresh water
Freshwater
Freshwater ecology
Gammarus pseudolimnaeus
Gravel
Invertebrates
Marine ecology
Production estimates
Streams
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Summary:Annual production by Gammarus pseudolimnaeus Bousfield in Valley Creek, Minnesota, was computed, using the size-frequency method, separately by substrate type for the 5-year period, 1968-1972. Four substrate types were identified: sand (θ 0 through 8); sand-gravel (θ-5 through 8); gravel (θ-1 through -5), and cobble (θ -6, -7). Annual production was higher in fine-particle substrates than in coarse; 5-year means were: sand, 21.4, sand-gravel, 21.8; gravel, 15.0, and cobble, 11.0 g/m2(dry weight). Siltation reduced production more in the fine-particle substrates than in coarse. Annual P/B ratios ranged mostly from 5.5-6.5, with 6.0 being the 5-year mean of all substrates combined. Densities and standing stocks were also higher in fine-particle substrates and were also affected more by the siltation in fine-particle substrates.
ISSN:0003-0031
1938-4238
DOI:10.2307/2425462