LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Back to previous search Search history
Advanced search

Your last searches

  1. AU="Jewitt, Debbie"
  2. AU=Karakose Oktay
  3. AU="Hu, Xiaolan"
  4. AU="Swamy, Samantha"
  5. AU="Kreykenbohm, I"

Search results

Result 1 - 5 of total 5

Search options

  1. Article ; Online: Planning for the Maintenance of Floristic Diversity in the Face of Land Cover and Climate Change.

    Jewitt, Debbie / Goodman, Peter S / Erasmus, Barend F N / O'Connor, Timothy G / Witkowski, Ed T F

    Environmental management

    2017  Volume 59, Issue 5, Page(s) 792–806

    Abstract: Habitat loss and climate change are primary drivers of global biodiversity loss. Species will need to track changing environmental conditions through fragmented and transformed landscapes such as KwaZulu-Natal, South Africa. Landscape connectivity is an ... ...

    Abstract Habitat loss and climate change are primary drivers of global biodiversity loss. Species will need to track changing environmental conditions through fragmented and transformed landscapes such as KwaZulu-Natal, South Africa. Landscape connectivity is an important tool for maintaining resilience to global change. We develop a coarse-grained connectivity map between protected areas to aid decision-making for implementing corridors to maintain floristic diversity in the face of global change. The spatial location of corridors was prioritised using a biological underpinning of floristic composition that incorporated high beta diversity regions, important plant areas, climate refugia, and aligned to major climatic gradients driving floristic pattern. We used Linkage Mapper to develop the connectivity network. The resistance layer was based on land-cover categories with natural areas discounted according to their contribution towards meeting the biological objectives. Three corridor maps were developed; a conservative option for meeting minimum corridor requirements, an optimal option for meeting a target amount of 50% of the landscape and an option including linkages in highly transformed areas. The importance of various protected areas and critical linkages in maintaining landscape connectivity are discussed, disconnected protected areas and pinch points identified where the loss of small areas could compromise landscape connectivity. This framework is suggested as a way to conserve floristic diversity into the future and is recommended as an approach for other global connectivity initiatives. A lack of implementation of corridors will lead to further habitat loss and fragmentation, resulting in further risk to plant diversity.
    MeSH term(s) Climate Change ; Conservation of Natural Resources ; Ecosystem ; Plants ; South Africa
    Language English
    Publishing date 2017-02-04
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1478932-2
    ISSN 1432-1009 ; 0364-152X
    ISSN (online) 1432-1009
    ISSN 0364-152X
    DOI 10.1007/s00267-017-0829-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  2. Article: Planning for the Maintenance of Floristic Diversity in the Face of Land Cover and Climate Change

    Jewitt, Debbie / Barend F. N. Erasmus / Ed T. F. Witkowski / Peter S. Goodman / Timothy G. O’Connor

    Environmental management. 2017 May, v. 59, no. 5

    2017  

    Abstract: Habitat loss and climate change are primary drivers of global biodiversity loss. Species will need to track changing environmental conditions through fragmented and transformed landscapes such as KwaZulu-Natal, South Africa. Landscape connectivity is an ... ...

    Abstract Habitat loss and climate change are primary drivers of global biodiversity loss. Species will need to track changing environmental conditions through fragmented and transformed landscapes such as KwaZulu-Natal, South Africa. Landscape connectivity is an important tool for maintaining resilience to global change. We develop a coarse-grained connectivity map between protected areas to aid decision-making for implementing corridors to maintain floristic diversity in the face of global change. The spatial location of corridors was prioritised using a biological underpinning of floristic composition that incorporated high beta diversity regions, important plant areas, climate refugia, and aligned to major climatic gradients driving floristic pattern. We used Linkage Mapper to develop the connectivity network. The resistance layer was based on land-cover categories with natural areas discounted according to their contribution towards meeting the biological objectives. Three corridor maps were developed; a conservative option for meeting minimum corridor requirements, an optimal option for meeting a target amount of 50% of the landscape and an option including linkages in highly transformed areas. The importance of various protected areas and critical linkages in maintaining landscape connectivity are discussed, disconnected protected areas and pinch points identified where the loss of small areas could compromise landscape connectivity. This framework is suggested as a way to conserve floristic diversity into the future and is recommended as an approach for other global connectivity initiatives. A lack of implementation of corridors will lead to further habitat loss and fragmentation, resulting in further risk to plant diversity.
    Keywords botanical composition ; climate ; climate change ; conservation areas ; decision making ; environmental factors ; habitat connectivity ; habitat destruction ; land cover ; landscapes ; planning ; refuge habitats ; risk ; South Africa
    Language English
    Dates of publication 2017-05
    Size p. 792-806.
    Publishing place Springer US
    Document type Article
    ZDB-ID 1478932-2
    ISSN 1432-1009 ; 0364-152X
    ISSN (online) 1432-1009
    ISSN 0364-152X
    DOI 10.1007/s00267-017-0829-0
    Database NAL-Catalogue (AGRICOLA)

    Full text online

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  3. Article: Floristic composition in relation to environmental gradients across KwaZulu‐Natal, South Africa

    Jewitt, Debbie / Goodman, Peter S / O'Connor, Timothy G / Witkowski, Ed T. F

    Austral ecology. 2015 May, v. 40, no. 3

    2015  

    Abstract: Conservation planning in the face of global change is still in its infancy. A suggested approach is to incorporate environmental gradients into conservation planning as they reflect the ecological and evolutionary processes generating and maintaining ... ...

    Abstract Conservation planning in the face of global change is still in its infancy. A suggested approach is to incorporate environmental gradients into conservation planning as they reflect the ecological and evolutionary processes generating and maintaining diversity. Our study provides a framework to identify the dominant environmental gradients determining floristic composition and pattern. Nonmetric multidimensional scaling was used on 2155 sampling plots in savanna and grassland habitat located across the province of KwaZulu‐Natal, South Africa (94 697 km²), a floristically rich region having steep environmental gradients, to determine the dominant gradients. Hierarchical cluster analysis was used to group similar plots which were then used in a Classification and Regression Tree analysis to determine the environmental delimiters of the identified vegetation clusters. Temperature‐related variables were the strongest delimiters of floristic composition across the province, in particular mean annual temperature. Frost duration was the primary variable in the Classification and Regression Tree analysis with important implications for savanna/grassland dynamics. Soil properties (base, pH status) and moisture variables accounted for most of the variation for the second and third axes of floristic variation. Given that climatic and edaphic variables were well correlated with floristic composition, it is anticipated that a changing climate will have a marked influence on floristic composition. We predict warmer temperatures may facilitate the spread of frost sensitive savanna species into previously cooler, grassland areas. Species associated with specific soil types will not easily be able to move up the altitudinal gradient to cooler climes because geology is aligned in an approximately north‐south direction compared with increasing altitude from east‐west. Future conservation planning should take cognisance of these gradients which are surrogates for ecological and evolutionary processes promoting persistence.
    Keywords altitude ; botanical composition ; climate change ; cluster analysis ; frost ; grasslands ; habitats ; multidimensional scaling ; pH ; planning ; regression analysis ; savannas ; soil properties ; soil types ; temperature ; South Africa
    Language English
    Dates of publication 2015-05
    Size p. 287-299.
    Publishing place Blackwell Science Asia
    Document type Article
    ZDB-ID 2756933-0
    ISSN 2052-1758 ; 1442-9985
    ISSN (online) 2052-1758
    ISSN 1442-9985
    DOI 10.1111/aec.12213
    Database NAL-Catalogue (AGRICOLA)

    Full text online

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  4. Article: Mapping landscape beta diversity of plants across KwaZulu-Natal, South Africa, for aiding conservation planning

    Jewitt, Debbie / Barend F. N. Erasmus / Ed T. F. Witkowski / Peter S. Goodman / Timothy G. O’Connor

    Biodiversity and conservation. 2016 Dec., v. 25, no. 13

    2016  

    Abstract: Collective properties of biodiversity, such as beta diversity, are suggested as complementary measures of species richness to guide the prioritisation and selection of important biodiversity areas in regional conservation planning. We assessed variation ... ...

    Abstract Collective properties of biodiversity, such as beta diversity, are suggested as complementary measures of species richness to guide the prioritisation and selection of important biodiversity areas in regional conservation planning. We assessed variation in the rate of plant species turnover along and between environmental gradients in KwaZulu-Natal, South Africa using generalised dissimilarity modelling, in order to map landscape levels of floristic beta diversity. Our dataset consisted of 434 plots (1000 m²) containing 997 grassland and savanna matrix species. Our model explained 79 % of the null deviance observed in floristic dissimilarities. Variable rates of turnover existed along the major environmental gradients of mean annual temperature, median rainfall in February, and soil cation exchange capacity, as well as along gradients of geographical distance. Beta diversity was highest in relatively warm, drier summer regions and on dystrophic soils. Areas of high beta diversity identify areas that should be included in conservation plans to maximise representation of diversity and highlight areas best suited to protected area expansion. Biome transition areas in high beta diversity areas may be susceptible to climate variability. Including beta diversity turnover rates in regional conservation plans will help to preserve evolutionary and ecological processes that create and maintain diversity.
    Keywords cation exchange capacity ; climate ; data collection ; ecosystems ; grasslands ; landscapes ; models ; planning ; prioritization ; rain ; savannas ; species diversity ; summer ; temperature ; South Africa
    Language English
    Dates of publication 2016-12
    Size p. 2641-2654.
    Publishing place Springer Netherlands
    Document type Article
    ZDB-ID 2000787-5
    ISSN 1572-9710 ; 0960-3115
    ISSN (online) 1572-9710
    ISSN 0960-3115
    DOI 10.1007/s10531-016-1190-y
    Database NAL-Catalogue (AGRICOLA)

    Full text online

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  5. Article: Climate-induced change of environmentally defined floristic domains: A conservation based vulnerability framework

    Jewitt, Debbie / Barend F.N. Erasmus / Damian M. Maddalena / Ed. T.F. Witkowski / Peter S. Goodman / Timothy G. O'Connor / William W. Hargrove

    Elsevier Ltd Applied geography. 2015 Sept., v. 63

    2015  

    Abstract: Global climate change is having marked influences on species distributions, phenology and ecosystem composition and raises questions as to the effectiveness of current conservation strategies. Conservation planning has only recently begun to adequately ... ...

    Abstract Global climate change is having marked influences on species distributions, phenology and ecosystem composition and raises questions as to the effectiveness of current conservation strategies. Conservation planning has only recently begun to adequately account for dynamic threats such as climate change. We propose a method to incorporate climate-dynamic environmental domains, identified using specific environmental correlates of floristic composition, into conservation strategies, using the province of KwaZulu-Natal, South Africa as a case study. The environmental domains offer an approach to conservation that conserves diversity under current and future climates, recognising that the species constituting diversity may change through time. We mapped current locations of domains by identifying their positions in a multi-dimensional environmental space using a non-hierarchical iterative k-means clustering algorithm. Their future locations were explored using an ensemble of future climate scenarios. The HadCM2 and GFDL2.1 models represented the extreme ranges of the models. The magnitude of change in each environmental domain was calculated using Euclidean distances to determine areas of greatest and least stability for each future climate projection. Domains occurring in the savanna biome increase at the expense of domains occurring in the grassland biome, which has significant negative consequences for the species rich grasslands. The magnitude of change maps represents areas of changed climatic conditions or edaphic disjunctions. The HadCM2 model predicted the greatest overall magnitude of change across the province. Species with specific soil requirements may not be able to track changing climatic conditions. A vulnerability framework was developed that incorporated climatic stability and habitat intactness indices. The mean magnitude of change informed the potential speed of transition of domains between the vulnerability quadrants. The framework informs appropriate conservation actions to mitigate climate change impacts on biodiversity. The study explicitly links floristic pattern and climate variability and provides useful insights to facilitate conservation planning for climate change.
    Keywords algorithms ; botanical composition ; case studies ; climate change ; climatic factors ; ecosystems ; geography ; grasslands ; habitats ; models ; phenology ; planning ; savannas ; soil ; South Africa
    Language English
    Dates of publication 2015-09
    Size p. 33-42.
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0143-6228
    DOI 10.1016/j.apgeog.2015.06.004
    Database NAL-Catalogue (AGRICOLA)

    Full text online

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

To top