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.
Enregistrements de données
Les données de cette ressource occurrence ont été publiées sous forme d'une Archive Darwin Core (Darwin Core Archive ou DwC-A), le format standard pour partager des données de biodiversité en tant qu'ensemble d'un ou plusieurs tableurs de données. Le tableur de données du cœur de standard (core) contient 10 107 enregistrements.
Cet IPT archive les données et sert donc de dépôt de données. Les données et métadonnées de la ressource sont disponibles pour téléchargement dans la section téléchargements. Le tableau des versions liste les autres versions de chaque ressource rendues disponibles de façon publique et permet de tracer les modifications apportées à la ressource au fil du temps.
Versions
Le tableau ci-dessous n'affiche que les versions publiées de la ressource accessibles publiquement.
Comment citer
Les chercheurs doivent citer cette ressource comme suit:
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
Droits
Les chercheurs doivent respecter la déclaration de droits suivante:
L’éditeur et détenteur des droits de cette ressource est National Fisheries Resources Research Institute. Ce travail est sous licence Creative Commons Attribution (CC-BY) 4.0.
Enregistrement GBIF
Cette ressource a été enregistrée sur le portail GBIF, et possède l'UUID GBIF suivante : 1882cf98-ecdb-4217-9fb7-7b6a02bc0ebf. National Fisheries Resources Research Institute publie cette ressource, et est enregistré dans le GBIF comme éditeur de données avec l'approbation du GBIF Uganda.
Mots-clé
Occurrence; Presence; Absence; Macroinvertebtrates; Lake Victoria; Uganda; Observation
Contacts
- Fournisseur Des Métadonnées ●
- Créateur ●
- Personne De Contact
- Personne De Contact
- Créateur
- Créateur
- Créateur
- Personne De Contact
Couverture géographique
The dataset covers Lake Victoria, Uganda.
| Enveloppe géographique | Sud Ouest [-1,066, 31,663], Nord Est [0,505, 33,959] |
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Couverture taxonomique
This dataset covers aquatic macro-invertebrates
| Class | Hirudinea, Oligochaeta, Ostracoda |
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| 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 |
Couverture temporelle
| Epoque de formation | 2003-current |
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Données sur le projet
Pas de description disponible
| Titre | Trawl surveys on Lake Victoria |
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| Description du domaine d'étude / de recherche | The trawl surveys have been undertaken on Lake Victoria, Uganda. |
| Description du design | 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. |
Les personnes impliquées dans le projet:
- Créateur
Méthodes d'échantillonnage
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).
| Etendue de l'étude | 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. |
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| Contrôle qualité | 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. |
Description des étapes de la méthode:
- 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.
Citations bibliographiques
- 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.
Métadonnées additionnelles
| Identifiants alternatifs | 1882cf98-ecdb-4217-9fb7-7b6a02bc0ebf |
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| http://ipt-uganda.gbif.fr/resource?r=macroinvertebratestrawl |