Abundance and community structure of birds breeding in Kalahari woodland used as rangeland

データ レコード

この オカレンス（観察データと標本) リソース内のデータは、1 つまたは複数のデータ テーブルとして生物多様性データを共有するための標準化された形式であるダーウィン コア アーカイブ (DwC-A) として公開されています。 コア データ テーブルには、47 レコードが含まれています。

この IPT はデータをアーカイブし、データ リポジトリとして機能します。データとリソースのメタデータは、 ダウンロード セクションからダウンロードできます。 バージョン テーブルから公開可能な他のバージョンを閲覧でき、リソースに加えられた変更を知ることができます。

バージョン

次の表は、公にアクセス可能な公開バージョンのリソースのみ表示しています。

引用方法

研究者はこの研究内容を以下のように引用する必要があります。:

Kopij, G., 2020. Abundance and community structure of birds breeding in Kalahari woodland used as rangeland. Museu de Ciències Naturals de Barcelona. Dataset/Occurrence: https://doi.org/10.15470/rova7r

権利

研究者は権利に関する下記ステートメントを尊重する必要があります。:

パブリッシャーとライセンス保持者権利者は Museu de Ciències Naturals de Barcelona。 This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License.

GBIF登録

このリソースをはGBIF と登録されており GBIF UUID: 792a2342-1dbb-459b-84cd-e6eb1f9ba6c9が割り当てられています。   GBIF Spain によって承認されたデータ パブリッシャーとして GBIF に登録されているMuseu de Ciències Naturals de Barcelona が、このリソースをパブリッシュしました。

キーワード

Community ecology; Population densities; Rangeland management; Occurrence; Occurrence

連絡先

地理的範囲

The study was conducted in the Sachinga Livestock Development Centre of the Ministry of Agriculture of the Namibian Government. The centre is situated in NE Namibia, in the Zambezi region, about 40 km west of Katima Mulilo, between S17.39.40-S17.40.20 and E 24.23.55-E24.24.02. The Centre is a ranch of 3,243 ha. Most of the Sachinga LDC is covered by teak woodland, with smaller portion of Burkea-Kisat-False Mopane woodland and Omuramba grassland. The natural vegetation is well-preserved and represented by three classes of Kalahari woodland: 1) Colophospermum mopane , with two dominant associations: Nymphaea nouchali–Eragrostis rotifer which contains water species, and Combretum imberbe–Acacia nigrescens in association with sparse woodlands; 2) Baikiaea plurijuga woodland, comprising Guibourtia coleospherma–Burkea africana Association and Combretum collinum–Boscia albitrunca association; and 3) Baikiaea plurijuga – Terminalia sericea class with Pterocarpus angolensis–Diploryhnchus condylocarpon association, Dalbergia martinii–Berchemia discolor association, and Acacia fleckii–Baphia massaiensis association (Lushetile, 2009).

生物分類学的範囲

説明がありません

時間的範囲

プロジェクトデータ

In all parts of Africa, the expansion and intensity of agriculture pose a major threat to biodiversity through the conversion of natural habitats to agrocenosis, fragmentation and degradation. However, in some places, where selected biota were carefully surveyed in agrocenosis, it has been shown that they may also well preserve certain communities, for example birds (Kopij, 1998, 2006, 2013, 2015, 2018; Ratclife and Crowe, 2001; Balwig et al., 2006; Humle, 2007; Mulwa et al., 2012; Nadng’ang’a et al., 2013). This is especially evident when traditional agriculture is established within woodlands and wet savannas. One of the largest broadleaved savanna type forests in Namibia is the Kalahari woodland. It occupies about 600,000 km2 in Kavango West, Kavango East, Zambezi, and eastern parts of Ohangwena and Oshikoto regions (Mendelsohn et al., 2009). This ecoregion supports a rich and diverse fauna that includes large populations of elephant Loxodonta africana, black rhino Diceros bicornis, white rhino Cerathotherium simum, leopard Panthera pardus, and wild dog Lycaon pictus (G. Kopij, own data). Nearly 500 bird species have been recorded in this biome (Kopij, 2016, 2017). Due to the scarcity of surface water, until rather recently, the Kalahari woodland was sparsely occupied by people, but in recent decades, human populations have been increasing and the cattle industry is growing, with far-reaching effects on the environment and wildlife (Mendelsohn et al., 2009). Every year, at least 1,000,000 m3 of raw timber harvested from this forest is shipped from Walvis Bay port to China (G. Kopij, own data). It is therefore essential to closely monitor and measure the resulting threats to the biodiversity and the whole ecosystem. This may help to formulate strategies and policies to protect this precious biome from widespread fragmentation, destruction, and degradation. The purpose of this study was to estimate population densities and dominance of bird species occurring in Kalahari woodland used for cattle grazing and to compare these ecological parameters with the same habitat that remains in a pristine stage.

プロジェクトに携わる要員:

収集方法

The American version of the transect line method (Bibby et al., 2012; Sutherland, 1996) was used to assess the population density and community structure of birds occurring in the ranch. A transect of 10 km in length and 100 m width (50 m on each side) was designed along roads traversing the ranch. The transect was divided into four equal sections (fig. 2). Each section was 2.5 km in length, and was surveyed three times (03/09/2014. 07/03/2015, 29/04/2015), each time in the same direction. Counts were conducted by the same observer, in the mornings, and in calm and cloudless weather conditions. Dominance is expressed as the percentage of the total number of pairs of a given species in relation to the total number of all pairs of all species recorded. A dominant species is defined as that comprising 5% or more of all individuals of all species recorded, and a subdominant species is defined as that comprising 2-4.99%.

Method step description:

1. The following indices were used to characterise diversity, evenness and similarity between the communities: 1) Shannon’s diversity index: H’ = -∑ pi ln pi where: pi is the proportion of breeding pairs belonging to the ith species 2) Simpson’s diversity index: D = ((∑n(n-1))/N(N-1) where: n – total number of breeding pairs belonging to a given species, N – total number of breeding pairs of all species 3) Pielou’s evenness index: J’ = (-∑ pi ln pi)/ln S where pi is the proportion of breeding pairs belonging to the ith species; S – total number of species. J’ varies between 0 and 1. The lower the variation between species in a community, the higher the J’. 4) Community dominance index: DI = (n1 + n2)/N where n1, n2 – number of pairs of the two most abundant species, N – total number of pairs of all species. 5) Sörensen’s Coefficient: I = 2C/A+B where A – the number of bird species in one plot, B – the number of bird species in another plot, C – the number of bird species common to both plots. Systematics and nomenclature of bird species follow Hockey et al. (2005). Scientific names of bird species are listed in appendix 1.

書誌情報の引用

1. Kopij, G., 2020. Abundance and community structure of birds breeding in Kalahari woodland used as rangeland. Arxius de Miscel·lania Zoologica, 18: 101-112, Doi: https://doi.org/10.32800/amz.2020.18.0101 https://doi.org/10.32800/amz.2020.18.0101

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