Articles by Keyword: Alien Species

Search results for Alien Species

We found 313 results for you
  1. Reductions in Plant Species Richness under Stands of Alien Trees and Shrubs in the Fynbos Biome

    Item type: Journal Article • Journal: South African Forestry Journal
    The reduction of species richness of indigenous plants is one of the major problems associated with the presence of dense stands of invasive alien trees and shrubs in the Fynbos Biome of the Cape Province, South Africa. A synthesis was...
  2. Commercial Forestry on Signal Hill and Lion's Head, Cape Town

    Item type: Journal Article • Journal: South African Forestry Journal
    The history of afforestation with alien tree species on Signal Hill and Lion's Head, which form part of the Table Mountain Nature Reserve, Cape Town, was reconstructed. The natural vegetation comprises mostly West Coast Renosterveld which is considered the most...
  3. Potential impacts of alien freshwater crayfish in South Africa

    Potential impacts of alien freshwater crayfish in South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The habitat preferences and life history characteristics of four alien species of freshwater crayfish (Cherax tenuimanus, C. destructor, C. quadricarinatus and Procambarus clarkii) are reviewed. The potential impact of these species on South African freshwater ecosystems is assessed and the...
  4. The global impact of alien trout species—a review; with reference to their impact in South Africa

    The global impact of alien trout species—a review; with reference to their impact in South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Rainbow and brown trout have been introduced into at least 82 countries, where they have significantly impacted indigenous fish, aquatic invertebrates and amphibians. In many studies the second, and sometimes the first, most serious identified threat to indigenous aquatic fauna...
  5. Nile tilapia invades the Lake Malawi catchment

    Nile tilapia invades the Lake Malawi catchment

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The Lake Malawi/Nyasa catchment contains over 835 endemic cichlid fish species. This unique biodiversity has made it widely recognised as one of the world's most significant freshwater ecosystems. Here we report the first occurrence records of two invasive tilapiines, Oreochromis...
  6. Marine alien species of South Africa — status and impacts

    Marine alien species of South Africa — status and impacts

    Item type: Journal Article • Journal: African Journal of Marine Science
    The current status of marine alien species along the South African coast is reviewed and the ecological and economic impacts of these invasions are discussed. In all, 10 confirmed extant alien and 22 cryptogenic species are recorded from the region...
  7. Intra-regional translocations of epifaunal and infaunal species associated with cultured Pacific oysters <em>Crassostrea gigas</em>

    Intra-regional translocations of epifaunal and infaunal species associated with cultured Pacific oysters <em>Crassostrea gigas</em>

    Item type: Journal Article • Journal: African Journal of Marine Science
    Farmed oysters host a diverse community of epifaunal and infaunal fouling taxa, including alien species, and these are easily translocated in the course of commercial oyster trade. We document the diversity and densities of fouling taxa associated with farmed oysters...
  8. Patterns and drivers of marine bioinvasions in eight Western Cape harbours, South Africa

    Patterns and drivers of marine bioinvasions in eight Western Cape harbours, South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    In South Africa, fouling is the dominant vector of marine invasions, being responsible for 48% of the 86 alien introductions that are known. This study aimed to document alien species in fouling assemblages in eight Western Cape harbours and to...
  9. Human impact on lake ecosystems: the case of Lake Naivasha, Kenya

    Human impact on lake ecosystems: the case of Lake Naivasha, Kenya

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Lake Naivasha is a wetland of national and international importance. However, it is under constant anthropogenic pressures, which include the quest for socioeconomic development within the lake ecosystem itself as well as other activities within the catchment. The lake is...
  10. Influence of largemouth bass, <em>Micropterus salmoides</em>, on abundance and habitat selection of Cape galaxias, <em>Galaxias zebratus</em>, in a mountain stream in the Cape Floristic Region, South Africa

    Influence of largemouth bass, <em>Micropterus salmoides</em>, on abundance and habitat selection of Cape galaxias, <em>Galaxias zebratus</em>, in a mountain stream in the Cape Floristic Region, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Predatory alien fishes have been widely introduced into streams in the Cape Floristic Region (CFR), South Africa, but little is known about their effect on native fishes. Results from this 2006 study suggest that the presence of alien predatory largemouth...