The data in this sampling event 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 1,462 records.
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How to cite
Researchers should cite this work as follows:
Pabire W G, Egessa R, Mwebaza-Ndawula L, Musinguzi L, Natugonza V (2019): Benthic macroinvertebrate taxa occurrences and composition associated with a cage aquaculture farm on Lake Victoria, Uganda. v1.1. National Fisheries Resources Research Institute. Dataset/Samplingevent. http://ipt-uganda.gbif.fr/resource?r=macroinvertebratesforson&v=1.1
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: 6cef8c28-b4dd-4082-af20-57cdc660a5bd. National Fisheries Resources Research Institute publishes this resource, and is itself registered in GBIF as a data publisher endorsed by GBIF Uganda.
Sampling event; macro-invertebrates; Uganda; Lake Victoria; Cage aquaculture
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The geographical area covers the location of the cage fish farm where data was collected.
|Bounding Coordinates||South West [0.403, 33.191], North East [0.411, 33.208]|
This information is about the benthic macro-invertebrates (ie; invertebrates which live on or in the sediment at the bottom of the water bodies and are big enough to be seen with naked eyes).
|Family||Baetidae, Ceratopogonidea, Chironomidae, Heptageniidae, Leptoceridae, Libellulidae, Perlidae|
|Genus||Ablabesmyia, Aspatheria, Biomphalaria, Bulinus, Caenis, Chaoborus, Chironomus, Clinotanypus, Cryptochironomus, Dipsuedopsis, Economus, Ephemerella, Euthraulus, Ictinogomphus, Phyllomacomia, Procladius, Pseudoneureclipsis, Sphaerium, Tanypus, Tanytarsus, Terithemis, Tricorythus|
|Species||Anisus natalensis, Bellamya unicolor, Byssanodonta parasitica, Caelatura alluaudi, Caelatura hauttecoeuri, Caelatura monceti, Caridina nilotica, Cleopatra pirothi, Corbicula africana, Etheria eliptica, Gabbia humerosa, Lentorbis junodi, Melanoides tuberculata, Mutela bourguignati, Pila ovata, Pisidium victoriae, Povilla adusta|
The project is part of a monitoring intervention that was established to monitor the impacts of cage aquaculture on water environment. This followed the introduction of a cage aquaculture in northern Lake Victoria in 2010. The environment monitoring is undertaken at Source of the Nile, a private cage fish farm, in Napoleon gulf, northern Lake Victoria. The monitoring is justified by the fact that cage aquaculture negatively impacts environmental conditions due to release of nutrients into the water, leading to undesirable impacts such as eutrophication, spread of diseases, genetic dilution for native species, and conflicts with other uses. Eutrophication can create anoxic conditions in sediments thus changing the abundance and composition of the resident organisms especially macroinvertebrates.
|Title||Environmental monitoring of Source of the Nile (SON) cage fish farm in Napoleon Gulf, northern Lake Victoria|
|Funding||Funding is provided by Source of the Nile Fish Farm Limited|
|Study Area Description||The study was undertaken at location of a fish farm. The farm is located near the headwaters of the River Nile, Napoleon gulf, Lake Vitoria, Uganda (Mwebaza-Ndawula et al. 2013).|
|Design Description||Three study transects were originally set up for the study. Transect 1 was approximately 1 km upstream of the area with fish cages (USC. Tansect 2 was located within the fish cage rows (WC) and transect 3 was approximately 1 km downstream of the fish cages (DSC). Each transect contained three sampling points, at intervals of 50 meters apart. These are named sequentially as site one, site two and site three under each transect category. However, as the fish farm expanded, some areas previously under some of the transects started being included under cages. As a result, a change in design was implemented since 2017 to include other sites namely between cages, reference point, upstream point and and within cages site 4.|
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 of the selected areas (see design above). 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 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).
|Study Extent||The monitoring project commenced in 2011. In that year, sampling was conducted once in February, May, September and November at each of the selected sampling points in each transect.|
|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.
- Mwebaza-Ndawula, L. et al. 2013. Effects of cage fish culture on water quality and selected biological communities in northern Lake Victoria, Uganda. Uganda Journal of Agricultural Sciences, 14(2), 61 – 75.
- Mandahl-Barth, G. (1954). The freshwater mollusks of Uganda and adjacent territories. Sciences Zoologiques 32: 206 pp.
- 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.