Assefa, Eshete (2009) Biomass and Production of the Major Zooplankton in Lake Kuriftu, Ethiopia. Masters thesis, Addis Ababa University.
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Abstract
Studies on the biomass and production of the dominant zooplankton were done in Lake Kuriftu from August, 2008 to May, 2009. The cyclopoid copepod (Thermocyclops consimilis) constituted 71% in abundance in Lake Kuriftu, but cladocerans and rotifers are also present almost in equal proportions. Brachionus calyciflorus (12%) was the second dominant species next to T. consimilis. T. consimilis was raised in the laboratory to obtain life history information (duration of embryonic and post-embryonic development) at 20 and 25.90C, and fed mixed algal food enhanced with F/2 culture medium. Laboratory data on the duration of development and biomass, together with population abundance data obtained in the field, were used to estimate the biomass and production of this species in Lake Kuriftu. The mean biomass and production of T. consimilis, attained during the study period, were 23.8 mg dry weight (DW) m-3 and 0.78 mg DW m-3day-1, respectively with daily and annual P:B ratio 0.033and 13.10, respectively. The dry mass of B. calyciflorus was determined from its biovolume by approximating the nearest geometric formula. Dry weight and recruitment of new individuals were used to calculate the production of B. calyciflorus. The mean biomass and production of this species were 629.66 µg DW m-3 and 180.38 µg DW m-3 day-1, respectively with daily and annual P:B ratio 0.29 and 21.31, respectively. Zooplankton production rates were low compared to values reported in the literature for the same or other species of equivalent sized copepods, from both tropical and subtropical regions.
| Item Type: | Thesis (Masters) |
|---|---|
| Subjects: | Q Science > Q Science (General) Q Science > QH Natural history > QH301 Biology |
| Divisions: | Africana |
| Depositing User: | Selom Ghislain |
| Date Deposited: | 29 Jun 2018 12:17 |
| Last Modified: | 29 Jun 2018 12:17 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/6263 |
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