The data in this occurrence resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 680 records.
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Researchers should cite this work as follows:
Pibire W G (2022): Diversity, distribution and abundance of macro-invertebrates in areas with different pollution levels in Lake Victoria. v1.2. National Fisheries Resources Research Institute. Dataset/Occurrence. http://ipt-uganda.gbif.fr/resource?r=macroinvertslakesvictoria&v=1.2
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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: b9e46a41-3eac-4ad1-b6c1-ad09b7ba9c45. National Fisheries Resources Research Institute publishes this resource, and is itself registered in GBIF as a data publisher endorsed by GBIF Uganda.
Occurrence; Observation; Occurrence
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Lake Victoria, Uganda
|Bounding Coordinates||South West [-1.022, 31.608], North East [0.549, 33.992]|
|Class||Hirudinea, Oligochaeta, Ostracoda|
|Family||Baetidae, Ceratopogonidea, Chironomidae, Corixidae, Ephemeridae, Gomphidae, Leptoceridae, Leptophlebidae, Libellulidae|
|Genus||Ablabesmyia, Biomphalaria, Bulinus, Caelatura, Caenis, Chaoborus, Chironomus, Clinotanypus, Cloeon, Conchostraca, Cryptochironomus, Economus, Procladius, Segmentorbis, Sphaerium, Tanypus, Tanytarsus|
|Species||Bellamya unicolor, Byssanodonta parasitica, Caelatura hauttecoeuri, Caelatura monceti, Caridina nilotica, Corbicula africana, Gabbia humerosa, Lentorbis junodi, Melanoides tuberculata, Mutera bourguignat, Pisidium victoriae, Povilla adusta|
LVEMP phase II (LVEMP II) was a project aimed at guiding the restoration of the Lake Victoria ecosystem through improved water quality and fisheries management, and prevention of land degradation in the lake’s catchment. The project had sub-activities on pollution designed to contribute to the project aim. The data in this dataset were as a result of a study conducted under the pollution sub-activities to determine the levels of pollution in Lake Victoria and the relationship of water quality and biotic communities. Please note that the project identifier above is not for LVEMP phase II but for another project that contributed to the publication of the data.
|Title||Lake Victoria Environmental Management Project Phase II (LVEMP II)|
|Funding||World Bank & East African Community (EAC) partner states|
|Study Area Description||The study area was Northern Lake Victoria, Uganda|
|Design Description||The study was carried out in seven sites in the northern part of Lake Victoria (Uganda) that were considered to have different pollution levels. The study focused on (1) areas receiving urban effluent (Murchison Bay and Napoleon Gulf), those draining large catchment areas via rivers (Berkeley Bay, Bunjako Bay and Kagera area) and those adjacent to agricultural hinterland without urban areas in their vicinity or river inflow (Hannington Bay and Kalangala area). Within each site, data were collected from up to three stations from near shore to offshore. The characteristics of these sites are summarized as follows. Murchison bay is an open bay exposed to wind mixing. It receives urban effluents from Kampala city and its suburbs. Napoleon gulf is moderately sheltered in vicinity of an urban and industrial centre. It receives effluents from urban sewage stabilization ponds, hosts cage fish farms. It is the location of the lake's outflow through the River Nile. Bunjako bay is relatively sheltered and shallow bay. It receives water from rich agricultural and pastoral farmlands of the Katonga sub-catchment via River Katonga. Berkeley bay is a shallow bay receiving silt-laden waters from rich agricultural areas through River Sio. Kagera receives silt-laden water from rich agricultural farmlands via River Kagera. It is exposed to high wind action and turbulent lake waters from the offshore. Hannington bay is a shallow (<10m) relatively sheltered bay receiving mainly surface run-off from rural subsistence agricultural hinterlands. It was considered as a relatively pristine area compared to other sites. Kalangala is exposed to high wind mixing with adjacent to commercial palm farmlands|
The personnel involved in the project:
At each sampling station, a ponar grab of 238 cm2 open jaw area was used to pick 3 hauls of sediment. Triplicate samples from each station were either individually concentrated or concentrated as a composite sample using a filtering bag of 400 µm mesh of nitex webbing. The concentrated samples were placed in sample containers, preserved in 5% formalin solution, labeled and taken to the laboratory for analysis. In the laboratory, the samples from each container were individually rinsed in water to wash away formalin and placed on a white flat-bottomed tray. Some water was added to spread the sample and all the benthic macro-invertebrates were sorted out using a pair of forceps. The organisms were classified and identified under a dissecting microscope (at 25X eye piece and 4X or 16X objectives) where detailed structures were required. Taxonomic identification keys: Merritt and Cummins (1997), Pennak (1978), and Mandahl-Barth (1954) were used in identification of the invertebrates. Individual members of each taxon were enumerated.
|Study Extent||Sampling of the sites was conducted in 2011, 2012 and 2013.|
|Quality Control||The samples were immediately processed in the field and treated with formalin to keep the organisms of interest intact and prevent them from rotting. To avoid loss of organisms during sample processing, appropriate mesh sizes during sieving. Appropriate taxonomic keys were used.|
Method step description:
- Collection of the macroinvertebrates In the field, sediment samples were collected using a Ponar grab with an open jaw surface area of 238 cm2. At each site, three sediment samples were obtained. The three samples were mixed and concentrated to form one composite sample for each site.
- Preserving the samples The composite sample for each site was separately preserved in 5% formalin to maintain the organisms in good condition prior to analysis in the laboratory.
- Identification of macroinvertebrates In the laboratory, formalin was rinsed off from each sample and placed in white flat-bottomed trays. Using pairs of forceps, all benthic macro invertebrates were sorted from the sediment and the individual taxa identified to the lowest possible taxonomic level using appropriate identification keys and a dissecting binocular microscope at 4x 25 magnification.
- Mendahl-Barth, G. (1954). The Freshwater Mollusks of Uganda and Adjacent Territories. Annls Mus. r. Congo Belge, 8°, Zoology, 32: 1–206.
- Merritt, R. W., & Cummins, K. W. (1997). An introduction to the aquatic insects of North America (3rd ed.). Dubuque: Kendall/Hunt Publishing Co. 720 Pg.
- Pennak, R.W. (1953). Fresh-water Invertebrates of the United States. John Wiley & Sons, New York. 769pg.