Use of field measurements of consumption and assimilation in evaluation of the role of Dreissena polymorpha Pall. in a lake ecosystem
Stanczykowska, A.; Lawacz, W.; Mattice, J.S. (1975). Use of field measurements of consumption and assimilation in evaluation of the role of Dreissena polymorpha Pall. in a lake ecosystem. Pol. Arch. Hydrobiol. 22(4): 509-520
In: Polskie Archiwum Hydrobiologii = Polish Archives of Hydrobiology. Polish Academy of Sciences. International Centre of Ecology: Dziekanów Lesny. ISSN 0032-3764, more
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| Keywords |
Algal blooms
Aquatic communities > Seston
Biological production > Primary production
Ecosystems
Energy flow
Environmental effects > Temperature effects
Feeding
Temporal variations > Periodic variations > Seasonal variations
Ceratium hirundinella (O.F.Müller) Dujardin, 1841 [WoRMS]; Dreissena polymorpha (Pallas, 1771) [WoRMS]
Fresh water |
| Authors | | Top |
- Stanczykowska, A.
- Lawacz, W.
- Mattice, J.S.
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| Abstract |
A simple device, based on the principle of the flow respirometer, was used to measure consumption, feces production and assimilation of D. polymorpha in Mikolajskie Lake. Containers with (experimental) and without (control) bivalves were submerged in the lake. Water containing seston was pulled from the lake, through the containers and into a boat by a persistaltic pump. By periodically sampling 21 of water and filtering it to get the concn of seston in terms of dry wt it was possible to estimate the amount of material consumed by the bivalves. Feces were collected in a glass tube attached to the bottom of the containers. Consumption less feces production gave the values of assimilation (A=C-F). Expts run from May till mid Oct 1971 and from June till Sept 1972. It was found that, in the spring, early summer and autumn, the consumption, and, assimilation were dependent on and proportional to the changes in temp and seston concn. Only in the mid-summer period this relationship was not recorded. Most probable factor of the decrease in feeding was the change in the food quality. In the 2nd half of July a heavy bloom of Ceratium hirundinella was observed. The average values of expts (each 24h long) for 1971 were: consumption 2.62 mg per indiv. Per day, feces production 1.56 mg per indiv. Per day, and assimilation 1.05 mg per indiv. Per day. The data for expts for 1972 were: consumption 2.2 mg per indiv. Per day, feces production 0.8 mg per indiv. Per day, assimilation 1.4 mg per indiv. Per day. Values for the estimated population in the lake for a 180-days season were predicted to be 165t, 98.2t and 66.8t(1971) and 285, 229 and 156(1972) tons for seston consumption, feces production and assimilation, respectively. These values in 1971 were 4.17% of net primary production in the lake and in 1972-9.73% of net production. Fecal production reached values of {approx} 5.6% (1971) and 13.1% (1972) as related to the yearly sedimentation in the pelagic zone of this lake. D. polymorpha is obviously an important component of this lake ecosystem both in terms of energy flow and material cycling (e. g. sedimentation). |
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