Floristic analysis of semi-arid mountain ecosystems of the Griqualand West centre of plant endemism, Northern Cape, South Africa

Abstract. Van Staden N, Siebert SJ, Cilliers DP, Wilsenach D, Frisby AW. 2020. Floristic analysis of semi-arid mountain ecosystems of the Griqualand West centre of plant endemism, Northern Cape, South Africa. Biodiversitas 21: 1989-2002. The Griqualand West Centre (GWC) is one of 13 centres of plant...

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Autores principales:	Nanette van Staden, STEFAN JOHN SIEBERT, DIRK PETRUS CILLIERS, DIAN WILSENACH, ARNOLD WALTER FRISBY
Formato:	article
Lenguaje:	EN
Publicado:	MBI & UNS Solo 2020
Materias:	asbestos, banded iron formation, ghaap plateau, kuruman, limestone, quartzite Biology (General) QH301-705.5
Acceso en línea:	https://doaj.org/article/bd009040df894c039d528b2e3f199e4c
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spelling	oai:doaj.org-article:bd009040df894c039d528b2e3f199e4c2021-11-22T00:35:33ZFloristic analysis of semi-arid mountain ecosystems of the Griqualand West centre of plant endemism, Northern Cape, South Africa1412-033X2085-472210.13057/biodiv/d210526https://doaj.org/article/bd009040df894c039d528b2e3f199e4c2020-04-01T00:00:00Zhttps://smujo.id/biodiv/article/view/5492https://doaj.org/toc/1412-033Xhttps://doaj.org/toc/2085-4722Abstract. Van Staden N, Siebert SJ, Cilliers DP, Wilsenach D, Frisby AW. 2020. Floristic analysis of semi-arid mountain ecosystems of the Griqualand West centre of plant endemism, Northern Cape, South Africa. Biodiversitas 21: 1989-2002. The Griqualand West Centre (GWC) is one of 13 centres of plant endemism in South Africa. Despite its unique flora, it remains poorly conserved and studied. A recent study identified an extensive geographical core area for the GWC, but endemic plant species were found to be absent from certain parts within these borders. To address this, we refined the current GWC borders based on an ecological niche model, which predicted that endemic species are restricted to four mountain ranges within GWC. Mountain floras within these refined borders were then floristically compared to assess whether they are hotspots of endemicity. Floristically, the Asteraceae, Fabaceae, Malvaceae, and Poaceae were the dominant plant families. Mountain ecosystems differed from one another at species level, with indicator species explaining the compositional differences. Distribution patterns of indicator species were determined by mean annual precipitation, Ca: Mg ratios, soil pH, cation exchange capacity, iron, and sand content. These environmental factors are possible drivers of niche partitioning, environmental filtering and habitat specialization in each mountain ecosystem. Limestone and banded ironstone habitats were identified as conservation priority areas, since they contained the highest numbers of rare and threatened GWC restricted-range species, of which six were narrow endemics.Nanette van StadenSTEFAN JOHN SIEBERTDIRK PETRUS CILLIERSDIAN WILSENACHARNOLD WALTER FRISBYMBI & UNS Soloarticleasbestos, banded iron formation, ghaap plateau, kuruman, limestone, quartziteBiology (General)QH301-705.5ENBiodiversitas, Vol 21, Iss 5 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	asbestos, banded iron formation, ghaap plateau, kuruman, limestone, quartzite Biology (General) QH301-705.5
spellingShingle	asbestos, banded iron formation, ghaap plateau, kuruman, limestone, quartzite Biology (General) QH301-705.5 Nanette van Staden STEFAN JOHN SIEBERT DIRK PETRUS CILLIERS DIAN WILSENACH ARNOLD WALTER FRISBY Floristic analysis of semi-arid mountain ecosystems of the Griqualand West centre of plant endemism, Northern Cape, South Africa
description	Abstract. Van Staden N, Siebert SJ, Cilliers DP, Wilsenach D, Frisby AW. 2020. Floristic analysis of semi-arid mountain ecosystems of the Griqualand West centre of plant endemism, Northern Cape, South Africa. Biodiversitas 21: 1989-2002. The Griqualand West Centre (GWC) is one of 13 centres of plant endemism in South Africa. Despite its unique flora, it remains poorly conserved and studied. A recent study identified an extensive geographical core area for the GWC, but endemic plant species were found to be absent from certain parts within these borders. To address this, we refined the current GWC borders based on an ecological niche model, which predicted that endemic species are restricted to four mountain ranges within GWC. Mountain floras within these refined borders were then floristically compared to assess whether they are hotspots of endemicity. Floristically, the Asteraceae, Fabaceae, Malvaceae, and Poaceae were the dominant plant families. Mountain ecosystems differed from one another at species level, with indicator species explaining the compositional differences. Distribution patterns of indicator species were determined by mean annual precipitation, Ca: Mg ratios, soil pH, cation exchange capacity, iron, and sand content. These environmental factors are possible drivers of niche partitioning, environmental filtering and habitat specialization in each mountain ecosystem. Limestone and banded ironstone habitats were identified as conservation priority areas, since they contained the highest numbers of rare and threatened GWC restricted-range species, of which six were narrow endemics.
format	article
author	Nanette van Staden STEFAN JOHN SIEBERT DIRK PETRUS CILLIERS DIAN WILSENACH ARNOLD WALTER FRISBY
author_facet	Nanette van Staden STEFAN JOHN SIEBERT DIRK PETRUS CILLIERS DIAN WILSENACH ARNOLD WALTER FRISBY
author_sort	Nanette van Staden
title	Floristic analysis of semi-arid mountain ecosystems of the Griqualand West centre of plant endemism, Northern Cape, South Africa
title_short	Floristic analysis of semi-arid mountain ecosystems of the Griqualand West centre of plant endemism, Northern Cape, South Africa
title_full	Floristic analysis of semi-arid mountain ecosystems of the Griqualand West centre of plant endemism, Northern Cape, South Africa
title_fullStr	Floristic analysis of semi-arid mountain ecosystems of the Griqualand West centre of plant endemism, Northern Cape, South Africa
title_full_unstemmed	Floristic analysis of semi-arid mountain ecosystems of the Griqualand West centre of plant endemism, Northern Cape, South Africa
title_sort	floristic analysis of semi-arid mountain ecosystems of the griqualand west centre of plant endemism, northern cape, south africa
publisher	MBI & UNS Solo
publishDate	2020
url	https://doaj.org/article/bd009040df894c039d528b2e3f199e4c
work_keys_str_mv	AT nanettevanstaden floristicanalysisofsemiaridmountainecosystemsofthegriqualandwestcentreofplantendemismnortherncapesouthafrica AT stefanjohnsiebert floristicanalysisofsemiaridmountainecosystemsofthegriqualandwestcentreofplantendemismnortherncapesouthafrica AT dirkpetruscilliers floristicanalysisofsemiaridmountainecosystemsofthegriqualandwestcentreofplantendemismnortherncapesouthafrica AT dianwilsenach floristicanalysisofsemiaridmountainecosystemsofthegriqualandwestcentreofplantendemismnortherncapesouthafrica AT arnoldwalterfrisby floristicanalysisofsemiaridmountainecosystemsofthegriqualandwestcentreofplantendemismnortherncapesouthafrica
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Floristic analysis of semi-arid mountain ecosystems of the Griqualand West centre of plant endemism, Northern Cape, South Africa

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