Description
This resource presets event, occurrence and measurement data conducted on the lower Okavango Delta Botswana. The data was generated during a survey of riparian woody vegetation by Susan Ringrose and Wilma Matherson, 1999-2000. Among variables covered are: plant density, species richness and total canopy of the woody vegetation of the riparian zones of distal region of the Delta.
Data Records
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 125 records.
2 extension data tables also exist. An extension record supplies extra information about a core record. The number of records in each extension data table is illustrated below.
This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.
Versions
The table below shows only published versions of the resource that are publicly accessible.
How to cite
Researchers should cite this work as follows:
Makati K, Murray-Hudson M, Mosie I, Mothobi R T, Kemosedile T, Khaneguba W, Mogojwa B (2018): Riparian Vegetation Survey of Lower Okavango Delta by Ringrose and Matheson 1999. v1.3. Okavango Research Institute. Dataset/Samplingevent. http://www.monitoringdata.ub.bw/ipt/resource?r=riparian_vegetation_survey_of_lower_okavango_delta
Rights
Researchers should respect the following rights statement:
The publisher and rights holder of this work is Okavango Research Institute. To the extent possible under law, the publisher has waived all rights to these data and has dedicated them to the Public Domain (CC0 1.0). Users may copy, modify, distribute and use the work, including for commercial purposes, without restriction.
GBIF Registration
This resource has been registered with GBIF, and assigned the following GBIF UUID: 77482be1-aa51-4db4-bda1-19c9fa31dc44. Okavango Research Institute publishes this resource, and is itself registered in GBIF as a data publisher endorsed by Participant Node Managers Committee.
Keywords
Samplingevent; woody vegetation; riparian vegetation; Okavango Delta; species density; species diversity
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http://orcid.org/https://orcid.org/0000-0001-6873-0913
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Geographic Coverage
The resource presents data collected from a survey of riparian woody vegetation of the lower Okavango Delta, Botswana
| Bounding Coordinates | South West [-20.195, 22.44], North East [-19.166, 23.725] |
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Taxonomic Coverage
The survey covers woddy vegetation along major distributary zones of the Okavango Delta. It focuses on vegetation growing on the riparian zones.
| Species | Croton megalobotrys (Large feverberry), Combretum hereroense (Russet bushwillow), Diospyros lycioides ssp. Sericea, Ficus sycomorus, Senegalia nigrescens, Vachellia erioloba, Ziziphus mucronata, Albizia harveyi, Colophospermum mopane, Combretum imberbe, Euclea divinorum, Grewia bicolor, Grewia schinzii, Rhus tenuinervis, Philenoptera violacea, Pechuel-Loeschea leubnitziae, Kigelia africana, Hyphaene petersiana, Maytenus senegalensis, Capparis tomentosa, Philenoptera nelsii |
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Sampling Methods
Field transects were developed perpendicular to the linear riparian woodland from the floodplain margin, during 1999–2000. At each site, three 90 m transects were paced along a compass bearing perpendicular to the floodplain margin at 5 km intervals. The unit area of the three transects comprising one field site is 810 m2 (cf. Ringrose and Matheson, 1991). Data from 64 sites included the recording of all woody species types, canopy extent and tree and shrub height along each of the 90 m transects. Canopy extent was calculated from the canopy diameter which was measured under specific trees. Species identification resulted in species lists of woody cover being systematically developed (cf. Tiner, 1999). Tree height was calculated using geometrical procedures while shrub height was measured using a vertically held tape (Kent and Coker, 1996). The differentiation of trees and shrubs is taken here at the 4.0 m limit, as described in Setshogo and Venter (2003). Canopy cover percent is the total measured canopy per site area. The calculation of plant density and species richness included all the species at a given site, divided into site area (Rebelo, 1994). The recruitment index was calculated as the total number of species-specific shrubs (same species recruits of the tall riparian trees) divided into the total number of riparian trees of the same species, per site.”
| Study Extent | A series of 68 sites were selected to represent the broad characteristics of riparian zones. The riparian regions covered include were associated with the following distributaries of the Okavango Delta: Boro, Gomoti, Matsebe, Thamalakane River, Kunyere, Xudum, Marophe and Shashe. |
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Method step description:
- Each site was located by using a Garmin 12 Global Positioning System to +/-10m. At each location species types, canopy cover, dead and live herbaceous cover were recorded along three 90m transects using standard texts (Cole and Brown, 1974; Timberlake, 1980; Palgrave, 1981, Roodt, 1 995, 1998). Soil colour and texture were also recorded at nine locations along the three transects at each site. The general state of the bush was noted in terms of degrees of trampling, evidence of erosion and calcrete formation. Tree and shrub heights were measured in the field using a range pole. The percentage woody vegetation cover (WVC), live herbaceous cover (AHC), dead herbaceous cover (DHC) and bare soil (BS) were calculated using a series of spreadsheet functions in Excel (Ringrose et al 1990; Matheson and Ringrose, 1994). The average tree and shrub heights were added to the species lists. Nominal leaf area (NLA) was calculated as a function of the tree or shrub canopy extent in relation to the height. This was multiplied by the number of species present to give the Cumulative Leaf Area. Plant density was calculated as the number of plants per 810m2 while species area ratio was calculated as the number of species per 810m2.
Additional Metadata
| Alternative Identifiers | 77482be1-aa51-4db4-bda1-19c9fa31dc44 |
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| https://www.monitoringdata.ub.bw/ipt/resource?r=riparian_vegetation_survey_of_lower_okavango_delta_sue_and_wilma_1999 |