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Influence of environmental factors on the production ofPotamothrix alatus paravanicusPoddubnaya & Pataridze (Tubificidae) in different areas of Lake Sevan

✍ Scribed by K. Jenderedjian

Publisher: Springer
Year: 1994
Tongue: English
Weight: 319 KB
Volume: 278
Category: Article
ISSN: 1573-5141
DOI: 10.1007/bf00142337

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✦ Synopsis

A modification of the Hynes' method was used to estimate production of Potamothrix alatus paravanicus Poddubnaya & Pataridze (Tubificidae), the dominant species of benthic invertebrate in Lake Sevan. Maximum production (5-24 g rnp2 wet weight) occurred in the sublittoral, while maximum biomass was found (8-17 g m -2 wet weight) in the profundal. The turnover ratio of the 'average cohort' varied between 2.4 and 5.0. The annual turnover ratio (P/B) decreased from 2.1-3.1 in the littoral to 0.1-0.4 in the profundal zone.

A logarithmic correlation was found between P/B and temperature and oxygen regime, and depth and average size of clitellate specimens.

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Population dynamics ofPotamothrix alatus

Population dynamics ofPotamothrix alatus paravanicusPoddubnaya & Pataridze (Tubificidae) in different areas of Lake Sevan

✍ K. Jenderedjian 📂 Article 📅 1994 🏛 Springer 🌐 English ⚖ 528 KB

Potamothrix alatus paravanicus Poddubnaya & Pataridze (Tubificidae) is the most abundant species of benthic invertebrate in Lake Sevan and the only species in the deep profundal. Differences in annual temperature, length of the stratification period (low oxygen content) and bottom sediment character