Four brook-dwelling populations of Ancylus fluviatilis were studied. Data on life-cycle, specimen number, biomass and egg capsule biomass are reported. By means of experimental data on ingestion, assimilation, growth and egg-production, energy balances are calculated for whole populations.Mean annual biomass turned out to be 26.58-64.88 mg C/m2. Mean annual biomass turn-over ratio (production/biomass) was 2.64-5.95. Cohort biomass turnover ratio was 4.11-6.09 for the whole population. Young specimens show considerably higher production efficiencies than adult ones. Production by the smallest size classes is a very considerable part of whole population production. Net production efficiency of the whole population was 11.2-11.8%, gross production efficiency 5.6-6.5%. An important factor for variation between different populations is temperature, but other factors, such as food supply, may be important, too. Experimental production estimates were compaerd with the Allen curve method and the instantaneous growth method.Differences due to different methods of production measurement are discussed. The range of values for different efficiencies lies within the range reported for other freshwater snails. Interpopulation variation in turnover ratios nearly equals variation reported for different species of univoltine snails.
Important Factor For Variation Smallest Size Classes Production Efficiency Higher Production Efficiencies Adult Ones Turn-over Ratio Instantaneous Growth Interpopulation Variation Annual Biomass Freshwater Snails
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Round-ups are the summaries of handpicked papers around trending topics published every week. These would enable you to scan through a collection of papers and decide if the paper is relevant to you before actually investing time into reading it.
Climate change Research Articles published between Sep 19, 2022 to Sep 25, 2022
Sep 26, 2022
Articles Included: 5
Disaster Prevention and Management ISSN: 0965-3562 Article publication date: 20 September 2022 This paper applies the theory of cascading, interconnec...Read More
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