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Taxa occurrence (presence/absence) and composition of benthic macroinvertebrates from trawl surveys (2003-2017) conducted on Lake Victoria, Uganda

Citation

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. Version 1.2. National Fisheries Resources Research Institute. Occurrence dataset https://doi.org/10.15468/tahwak accessed via GBIF.org on 2022-05-19.

Description

This dataset provides the occurrence, distribution, and abundance or composition of benthic macro-invertebrates collected through trawl surveys conducted on Lake Victoria, Uganda. The overall objective of the trawl surveys conducted overtime has been to examine composition, distribution and abundance patterns of benthic macro-invertebrates in order to determine ecosystem health in relation to fisheries.

Sampling Description

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.

Sampling

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).

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 steps

  1. 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.

Taxonomic Coverages

This dataset covers aquatic macro-invertebrates
  1. Povilla adusta
    rank: species
  2. Ablabesmyia
    rank: genus
  3. Aeschenidae
    rank: family
  4. Aspatheria
    rank: genus
  5. Bellamya unicolor
    rank: species
  6. Bulinus
    rank: genus
  7. Byssanodonta parasitica
    rank: species
  8. Caelatura
    rank: genus
  9. Caelatura alluaudi
    rank: species
  10. Caelatura hauttecoeuri
    rank: species
  11. Caelatura monceti
    rank: species
  12. Caenis
    rank: genus
  13. Caridina nilotica
    rank: species
  14. Chaoborus
    rank: genus
  15. Chironomus
    rank: genus
  16. Clinotanypus
    rank: genus
  17. Corbicula africana
    rank: species
  18. Cryptochironomus
    rank: genus
  19. Economidae
    rank: family
  20. Ephemeridae
    rank: family
  21. Gabbia humerosa
    rank: species
  22. Gomphidae
    rank: family
  23. Hirudinea
    rank: class
  24. Leptoceridae
    rank: family
  25. Libellulidae
    rank: family
  26. Melanoides tuberculata
    rank: species
  27. Mutela bourguignati
    rank: species
  28. Oligochaeta
    rank: class
  29. Ostracoda
    rank: class
  30. Philopotamidae
    rank: family
  31. Pisidium
    rank: genus
  32. Povilla adusta
    rank: species
  33. Procladius
    rank: genus
  34. Pseudoneureclipsis
    rank: genus
  35. Sphaerium
    rank: genus
  36. Tanypus
    rank: genus
  37. Tanytarsus
    rank: genus

Geographic Coverages

The dataset covers Lake Victoria, Uganda.

Bibliographic Citations

  1. 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. -
  2. Mendahl-Barth, G. (1954). The Freshwater Mollusks of Uganda and Adjacent Territories. Annls Mus. r. Congo Belge, 8°, Zoology, 32: 1–206. -
  3. 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. -
  4. Pennak, R.W. 1953. Fresh-water invertebrates of the United States. -

Contacts

Willy Gandhi Pabire
originator
position: Research technician
National Fisheries Resources Research Institute
Nile Crescent, Plot 39/45, Jinja Opposite the wagon ferry terminal
Jinja
343
UG
Telephone: +256776959037
email: gpabire@yahoo.com
Laban Musinguzi
originator
position: Research officer
National Fisheries Resources Research Institute
Nile Crescent, Plot 39/45, Jinja Opposite the wagon ferry terminal
Jinja
343
UG
Telephone: +256775701126
email: labanmusinguzi@firi.go.ug
homepage: https://labanmusinguzi.com/
userId: https://scholar.google.com/citations?user=m2Dzl1gAAAAJ&hl=en
Vianny Natugonza
originator
position: Research officer
National Fisheries Resources Research Institute
Nile Crescent, Plot 39/45, Jinja opposite the Wagon ferry terminal
Jinja
343
email: viannynatugonza@firi.go.ug
userId: http://scholar.google.com/citations?user=https://scholar.google.ca/citations?user=KewxfP8AAAAJ&hl=en
Robert Egessa
originator
position: Research Officer
National Fisheries Resources Research Institute
Nile Crescent, Plot 39/45, Jinja Opposite the wagon ferry terminal
Jinja
343
UG
email: robert.egessa@gmail.com
Lucas Mwebaza-Ndawula
originator
position: Senior Research Officer
National Fisheries Resources Research Institute
Nile Crescent, Plot 39/45, Jinja Opposite the wagon ferry terminal
Jinja
343
UG
email: mugenda@gmail.com
Willy Gandhi Pabire
metadata author
position: Research technician
National Fisheries Resources Research Institute
Nile Crescent, Plot 39/45, Jinja Opposite the wagon ferry terminal
Jinja
343
UG
Telephone: +256776959037
email: gpabire@yahoo.com
Laban Musinguzi
point of contact
position: Research officer
National Fisheries Resources Research Institute
Nile Crescent, Plot 39/45, Jinja Opposite the wagon ferry terminal
Jinja
343
UG
Telephone: +256775701126
email: labanmusinguzi@firi.go.ug
homepage: https://labanmusinguzi.com/
userId: https://scholar.google.com/citations?user=m2Dzl1gAAAAJ&hl=en
Willy Gandhi Pabire
administrative point of contact
position: Research technician
National Fisheries Resources Research Institute
Nile Crescent, Plot 39/45, Jinja Opposite the wagon ferry terminal
Jinja
343
UG
Telephone: +256776959037
email: gpabire@yahoo.com
Laban Musinguzi
administrative point of contact
position: Research Officer
National Fisheries Resources Research Institute
Nile Crescent, Plot 39/45, Jinja Opposite the wagon ferry terminal
Jinja
343
UG
Telephone: +256775701126
email: labanmusinguzi@firi.go.ug
userId: https://scholar.google.com/citations?user=m2Dzl1gAAAAJ&hl=en
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