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 10,107 records.
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How to cite
Researchers should cite this work as follows:
Pabire W G, Musinguzi L, Natugonza V, Egessa R, Mwebaza-Ndawula L (2019): Taxa occurrence (presence/absence) and composition of benthic macroinvertebrates from trawl surveys (2003-2017) conducted on Lake Victoria, Uganda. v1.2. National Fisheries Resources Research Institute. Dataset/Occurrence. http://ipt-uganda.gbif.fr/resource?r=macroinvertebratestrawl&v=1.2
Researchers should respect the following rights statement:
The publisher and rights holder of this work is National Fisheries Resources Research Institute. This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License.
This resource has been registered with GBIF, and assigned the following GBIF UUID: 1882cf98-ecdb-4217-9fb7-7b6a02bc0ebf. National Fisheries Resources Research Institute publishes this resource, and is itself registered in GBIF as a data publisher endorsed by GBIF Uganda.
Occurrence; Presence; Absence; Macroinvertebtrates; Lake Victoria; Uganda; Observation
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The dataset covers Lake Victoria, Uganda.
|Bounding Coordinates||South West [-1.066, 31.663], North East [0.505, 33.959]|
This dataset covers aquatic macro-invertebrates
|Class||Hirudinea, Oligochaeta, Ostracoda|
|Family||Aeschenidae, Economidae, Ephemeridae, Gomphidae, Leptoceridae, Libellulidae, Philopotamidae|
|Genus||Ablabesmyia, Aspatheria, Bulinus, Caelatura, Caenis, Chaoborus, Chironomus, Clinotanypus, Cryptochironomus, Pisidium, Procladius, Pseudoneureclipsis, Sphaerium, Tanypus, Tanytarsus|
|Species||Povilla adusta, Bellamya unicolor, Byssanodonta parasitica, Caelatura alluaudi, Caelatura hauttecoeuri, Caelatura monceti, Caridina nilotica, Corbicula africana, Gabbia humerosa, Melanoides tuberculata, Mutela bourguignati, Povilla adusta|
No Description available
|Title||Trawl surveys on Lake Victoria|
|Study Area Description||The trawl surveys have been undertaken on Lake Victoria, Uganda.|
|Design Description||Trawl surveys on Lake Victoria, Uganda are conducted in several transects. Ponar grab samples for benthic macro-invertebrates are taken at the end or beginning of each transect, presented by coordinates in the dataset. Three hauls of sediment are taken by the Ponar grab sampler of 238 cm2 at each sampling point and combined to make a composite sample.|
The personnel involved in the project:
A Ponar grab (with open jaw area, 238cm2) was used to take sediment samples for analysis of benthic macroinvertebrates. Three spread hauls were taken from each sampling point. The bottom type at each point was described from the grabbed contents. Each of the three samples (hauls) from each area was then concentrated placed in labeled sample bottles, and preserved with 5% formalin solution and taken for laboratory analysis. In the laboratory, each sample was rinsed with water to remove the formalin and then placed on a white flat-bottomed tray. Using pair of forceps all macro-invertebrates were sorted from the sediment and the individual taxa identified to the lowest possible taxonomic level using identification manuals and a dissecting binocular microscope at 4 x 25 magnification. All taxa from the different hauls were recorded and individuals of each taxon enumerated to estimate their densities from which the following results were generated. The taxa were identified using taxonomic keys by Mandahl-Barth (1954), Pennak (1953), and Merritt and Cummins (1997). De Moor et al. (2003).
|Study Extent||The datasets present data for trawl surveys conducted between 2003 and 2017. However, not all transects or years may be represented in the sample as depending on resources, sampling may not take place in some years or transects.|
|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 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 x 25 magnification.
- De Moor IJ, Day JA and de Moor FC (Eds) (2003b) Guide to Freshwater Invertebrates of South Africa. Vol. 8: Insect II. Hemiptera, Megaloptera, Neuroptera, Trichoptera & Lepidoptera, 208Pp.
- 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 Pages. Pennak, R. W. (1953). Fresh-water invertebrates of the United States. New York: The Ronald Press Company.
- Pennak, R.W. 1953. Fresh-water invertebrates of the United States.