Descripción
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.
Registros
Los datos en este recurso de registros biológicos han sido publicados como Archivo Darwin Core(DwC-A), el cual es un formato estándar para compartir datos de biodiversidad como un conjunto de una o más tablas de datos. La tabla de datos del core contiene 10.107 registros.
Este IPT archiva los datos y, por lo tanto, sirve como repositorio de datos. Los datos y los metadatos del recurso están disponibles para su descarga en la sección descargas. La tabla versiones enumera otras versiones del recurso que se han puesto a disposición del público y permite seguir los cambios realizados en el recurso a lo largo del tiempo.
Versiones
La siguiente tabla muestra sólo las versiones publicadas del recurso que son de acceso público.
¿Cómo referenciar?
Los usuarios deben citar este trabajo de la siguiente manera:
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
Derechos
Los usuarios deben respetar los siguientes derechos de uso:
El publicador y propietario de los derechos de este trabajo es National Fisheries Resources Research Institute. Esta obra está bajo una licencia Creative Commons de Atribución/Reconocimiento (CC-BY 4.0).
Registro GBIF
Este recurso ha sido registrado en GBIF con el siguiente UUID: 1882cf98-ecdb-4217-9fb7-7b6a02bc0ebf. National Fisheries Resources Research Institute publica este recurso y está registrado en GBIF como un publicador de datos avalado por GBIF Uganda.
Palabras clave
Occurrence; Presence; Absence; Macroinvertebtrates; Lake Victoria; Uganda; Observation
Contactos
- Proveedor De Los Metadatos ●
- Originador ●
- Punto De Contacto
- Punto De Contacto
- Originador
- Originador
- Originador
- Punto De Contacto
Cobertura geográfica
The dataset covers Lake Victoria, Uganda.
| Coordenadas límite | Latitud Mínima Longitud Mínima [-1,066, 31,663], Latitud Máxima Longitud Máxima [0,505, 33,959] |
|---|
Cobertura taxonómica
This dataset covers aquatic macro-invertebrates
| Class | Hirudinea, Oligochaeta, Ostracoda |
|---|---|
| Familia | Aeschenidae, Economidae, Ephemeridae, Gomphidae, Leptoceridae, Libellulidae, Philopotamidae |
| Género | Ablabesmyia, Aspatheria, Bulinus, Caelatura, Caenis, Chaoborus, Chironomus, Clinotanypus, Cryptochironomus, Pisidium, Procladius, Pseudoneureclipsis, Sphaerium, Tanypus, Tanytarsus |
| Especie | Povilla adusta, Bellamya unicolor, Byssanodonta parasitica, Caelatura alluaudi, Caelatura hauttecoeuri, Caelatura monceti, Caridina nilotica, Corbicula africana, Gabbia humerosa, Melanoides tuberculata, Mutela bourguignati, Povilla adusta |
Cobertura temporal
| Periodo de formación | 2003-current |
|---|
Datos del proyecto
No hay descripción disponible
| Título | Trawl surveys on Lake Victoria |
|---|---|
| Descripción del área de estudio | The trawl surveys have been undertaken on Lake Victoria, Uganda. |
| Descripción del diseño | 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. |
Personas asociadas al proyecto:
- Originador
Métodos de muestreo
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).
| Área de Estudio | 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. |
|---|---|
| Control de Calidad | 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. |
Descripción de la metodología paso a paso:
- 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.
Referencias bibliográficas
- 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.
Metadatos adicionales
| Identificadores alternativos | 1882cf98-ecdb-4217-9fb7-7b6a02bc0ebf |
|---|---|
| http://ipt-uganda.gbif.fr/resource?r=macroinvertebratestrawl |