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Researchers should cite this work as follows:
Kiggundu V, Egessa R, Mwebaza-Ndawula L (2021): Zooplankton occurrences and abundance in the Lake Edward system, Uganda. v1.0. National Fisheries Resources Research Institute. Dataset/Occurrence. http://ipt-uganda.gbif.fr/resource?r=lakeedwardsystemzoo&v=1.0
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The publisher and rights holder of this work is National Fisheries Resources Research Institute. This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC) 4.0 License.
This resource has been registered with GBIF, and assigned the following GBIF UUID: 1dc8b287-7eab-49a8-ad49-efcb4671b2a6. National Fisheries Resources Research Institute publishes this resource, and is itself registered in GBIF as a data publisher endorsed by GBIF Uganda.
Occurrence; Uganda; Zooplankton; Lake Edward; Observation
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Lake Edward system, including two nearby small lakes (Chahafi and Kayumbu) in the Lake Victoria Basin)
|Bounding Coordinates||South West [-1.406, 29.498], North East [0.785, 30.52]|
The taxa include three broad groups of zooplankton: Copepoda, Cladocera and Rotifera
|Genus||Afrocyclops, Ascomorpha, Asplanchna, Brachionus, Cephalodella, Chydorus, Euclanis, Eucyclops, Hexathra, Macrothrix, Mesocyclops, Platyias, Polyarthra, Synchaeta, Trichocerca|
|Species||Brachionus angularis, Brachionus bidentata, Brachionus budapestinensis, Brachionus calyciflorus, Brachionus caudatus, Brachionus dimidiatus, Brachionus falcatus, Brachionus forficula, Brachionus patulus, Brachionus quadridentatus, Brachionus urceolaris, Ceriodaphnia cornuta, Ceriodaphnia dubia, Daphnia barbata, Daphnia longispina, Diaphanosoma excisum, Filinia longiseta, Filinia opoliensis, Keratella cochlearis, Keratella tropica, Lecane bulla, Lecane levistyla, Lecane luna, Moina micrura, Platyias quadricornis, Polyarthra vulgaris, Synchaeta pectinata, Testudinella parva, Thermocyclops hyalinus, Thermocyclops incisus, Thermocyclops neglectus, Thermocyclops oblongatus, Thermodiaptomus galeboides, Trichocerca cylindrica, Tropocyclops confinnis, Tropocyclops tenellus, Tropodiaptomus stuhlmanni|
This work was part of research and monitoring studies conducted in predetermined sites and localities on water bodies within the Lake Edward system, including two nearby small lakes in the Lake Victoria basin. The lakes covered include Edward, George, Mutanda, Mulehe, Chahafi, Nakasanda, Bunyonyi and Kayumbu. The rivers covered are Rwimi and Lubilia. The wetlands covered are Kyase, Kiruruma and Ruhuma. The sites sampled represent different habitats based on the factors such as depth, distances from shoreline and water flow (lentic or lotic). In lakes, zooplankton samples were collected with a conical plankton net (Nansen type; mesh size 60 µm or 100 µm; mouth diameter 0.25 m), towed vertically through the water column, as described by Fernando (2002) and Mwebaza-Ndawula (1994). In rivers and wetlands, sampling was done using Schindler trap with 5 litre capacity. Each sample was washed with tap water in the laboratory over a 53 µm sieve to remove the preservative and then diluted to a suitable volume, depending on the concentration of organisms in each sample. Sub-samples of 2, 2, 5 and 10 mL were taken with a wide bore automatic pipette from a well agitated sample. The sub-sample series were performed to consider the more abundant organisms in 2, 2 mL series, and the rarer organisms in 2, 2, 5, 10 mL series. Each sub-sample was put into a counting chamber and examined under inverted microscope (Hund, Wetzlar, Germany) at X100 magnification for taxonomic determination, and X40 for counting and organism body measurements.
|Study Extent||The water bodies covered were sampled between 1998 and 2020. However, sampling was not consistent for the water bodies over the period. Data is available for specified waterbodies for 1998-99, 2011-14, 2016 and 2020.|
|Quality Control||Some zooplankton were able to be identified to species level using published taxonomic keys (Sars 1895; Pennak 1953; Brooks 1957; Rutner-Kolisko 1974; Koste 1978; Boxshall & Braide 1991; Korinek 1999). Taxonomic names were cross-checked using the World Register of Marine Species (WoRMS). Volume densities of organisms were calculated from the counts data, with reference to the sample net mouth diameter and water column depth at each sampling site as per Fernando (2002).|
Method step description:
- Collection of the zooplankton In lakes, a conical plankton net (Nansen type; mesh size 60 or 100 µm; mouth diameter 0.25 m), towed vertically through the water column to have an integrated sample was used to collect the zooplankton. Collection of samples in rivers and wetlands used a Schindler trap. Three hauls were taken per site and were combined to make a composite sample.
- Preserving the samples Samples were preserved in a sugar-formalin mixture. The sugar was to stop the ballooning of cladocerans for easy identification.
- Identification of zooplankton taxa In the laboratory, samples were washed using a sieve of 53 µm to remove the fixatives. Organisms were identified to the smallest taxonomic level possible using taxonomic keys (Sars, 1895, Pennak, 1953, Brooks, 1957, Rutner-Kolisko, 1974, Koste, 1978, Boxshall and Braide, 1991, Korinek, 1999). Density of organisms were calculated from the counts data, with reference to the sample net mouth diameter and water column depth at each sampling site.
- Boxshall, G. A. & Braide, E. I. 1991. The freshwater cyclopoid copepods of Nigeria, with an illustrated key to all species. Bull. Br. Mus. Nat. Hist. (zool), 57, 185-212.
- Brooks, J. L. 1957. The systematics of North American Daphnia. Memoirs of the connecticut academy of Arts and Sciences, 13, 1-18.
- Fernando, C. H. 2002. A Guide to Tropical Freshwater Zooplankton. Identification, Ecology and Impact on Fisheries, Leiden, The Netherlands, Backhuys Publishers.
- Korinek, V. 1999. A guide to limnetic species of Cladocera of African inland waters (Crustacea, Branchiopoda). The International Association of Theoretical and Applied Limnology. SIL.
- Koste, W. 1978. Rotatoria. Die Radertiere Mitteleuropas. Ein Bestimmungwerk, begrundet vo Max Voig. Uberrordnung Monogononta. Gebruder Borntraeger, Berlin, Stuttgart.
- Pennak, R. W. 1953. Fresh-water invertebrates of the United States, New York, John Wiley & Sons.
- Rutner-Kolisko, A. 1974. Planktonic rotifers: Biology and taxonomy, Biological Station Lunz of the Austrian Academy of Science. E. Schweizerbart’sche Verlagsbuchhandlung.
- Sars, G. O. 1895. An account of the Crustacea of Norway, Christiania and Copenhagen Alb. Cammermeyer Forlag