Articles by Keyword: Predation

Search results for Predation

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  1. Investigations on the removal by animals of <em>Acacia longifolia</em> (Fabaceae) seed from the soil surface at Banhoek in the southwestern Cape

    Investigations on the removal by animals of <em>Acacia longifolia</em> (Fabaceae) seed from the soil surface at Banhoek in the southwestern Cape

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Studies on the removal of Acacia longifolia (Andr.) Willd. seed from trays on the soil surface showed that 91,07% of the seed was removed after one week of exposure. Exclusion treatments indicated that ants removed 57,22% of the seed while...
  2. POSSIBLE ADAPTIVE SIGNIFICANCE OF SEX RATIO AND SEXUAL DIFFERENCES IN SIZE AT MATURITY IN THE ORANGE RIVER LABEO, <em>LABEO CAPENSIS</em>

    POSSIBLE ADAPTIVE SIGNIFICANCE OF SEX RATIO AND SEXUAL DIFFERENCES IN SIZE AT MATURITY IN THE ORANGE RIVER LABEO, <em>LABEO CAPENSIS</em>

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Labeo capensis spawns on inundated vegetation during flood periods. Suitable conditions for spawning are of short duration and do not allow time for extended breeding behaviour. The success of fertilisation is therefore probably independent of the size of males. This...
  3. OBSERVATIONS ON THE DISTRIBUTION, EMERGENCE AND BEHAVIOUR OF CENTRAL AFRICAN CHAOBORIDAE

    OBSERVATIONS ON THE DISTRIBUTION, EMERGENCE AND BEHAVIOUR OF CENTRAL AFRICAN CHAOBORIDAE

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The distribution of four species of Chaoboras over selected parts of Zimbabwe is given. The effect of temperature on the duration of the larval life cycle is discussed in relation to the generation time and the lunar periodicity of the...
  4. Aspects of the seed ecology of Acacia karroo in the Eastern Cape, South Africa

    Aspects of the seed ecology of Acacia karroo in the Eastern Cape, South Africa

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Seed ecology may play a role in the widespread increase of Acacia karroo in savanna and grassland. Accordingly, fecundity, predation, mortality by fire, dispersal by livestock, and seed longevity were studied. Seed production per tree (P of pod production, pods...
  5. A preliminary assessment of the impact of alien rainbow trout (<em>Oncorhynchus mykiss</em>) on indigenous fishes of the upper Berg River, Western Cape Province, South Africa

    A preliminary assessment of the impact of alien rainbow trout (<em>Oncorhynchus mykiss</em>) on indigenous fishes of the upper Berg River, Western Cape Province, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Impacts of alien rainbow trout (Oncorhynchus mykiss) on critically endangered Berg River redfin (Pseudobarbus burgi), Cape kurper (Sandelia capensis) and Cape galaxias (Galaxias zebratus) in the upper Berg River were investigated in terms of predation and spatial interactions. Trout stomach...
  6. Macro-invertebrate predators of freshwater pulmonate snails in Africa, with particular reference to <em>Appasus grassei</em> (Heteroptera) and <em>Procambarus clarkii</em> (Decapoda)

    Macro-invertebrate predators of freshwater pulmonate snails in Africa, with particular reference to <em>Appasus grassei</em> (Heteroptera) and <em>Procambarus clarkii</em> (Decapoda)

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    A range of African and alien macro-invertebrates has been reported preying on freshwater pulmonate snails, including those that serve as intermediate hosts for bloodflukes of the genus Schistosoma. Predation by five molluscivorous taxa is reviewed here: indigenous leeches (Glossiphoniidae), marsh...
  7. The predatory impact of invasive alien smallmouth bass, <em>Micropterus dolomieu</em> (Teleostei: Centrarchidae), on indigenous fishes in a Cape Floristic Region mountain stream

    The predatory impact of invasive alien smallmouth bass, <em>Micropterus dolomieu</em> (Teleostei: Centrarchidae), on indigenous fishes in a Cape Floristic Region mountain stream

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Fish populations in the Rondegat River, a mountain stream in the Olifants-Doring system in the Cape Floristic Region, South Africa were surveyed to assess the impact of predatory alien invasive smallmouth bass Micropterus dolomieu (Lacepède) on the indigenous fishes. This...
  8. Predation impact of juvenile <em>Gilchristella aestuaria</em> (Clupeidae) and <em>Atherina breviceps</em> (Atherinidae) on the zooplankton in the temperate Kariega estuary, South Africa

    Predation impact of juvenile <em>Gilchristella aestuaria</em> (Clupeidae) and <em>Atherina breviceps</em> (Atherinidae) on the zooplankton in the temperate Kariega estuary, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Seasonal changes in the predation impact of juvenile (SL 18–25mm) Atherina breviceps and Gilchristella aestuaria on zooplankton was investigated at three stations in the middle reaches of the permanently open Kariega estuary during 1999 and 2000. Daily rations were estimated...
  9. The effect of largemouth bass <em>Micropterus salmoides</em> on aquatic macro-invertebrate communities in the Wit River, Eastern Cape, South Africa

    The effect of largemouth bass <em>Micropterus salmoides</em> on aquatic macro-invertebrate communities in the Wit River, Eastern Cape, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Fish predation is one of the driving forces of freshwater invertebrate community structures, with alien predators having a pronounced effect. A quantitative assessment of aquatic invertebrates in the Wit River, Sundays River catchment, Eastern Cape, South Africa, was undertaken to...
  10. Factors governing the removal of faecal indicator bacteria in the ecosystem of Lake Timsah, Egypt

    Factors governing the removal of faecal indicator bacteria in the ecosystem of Lake Timsah, Egypt

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Persistence of faecal coliforms, presumptive Vibrio cholerae and Vibrio parahaemolyticus at three stations in Lake Timsah were investigated in 2010. Samples were collected by day and at night. Bacterial counts were highest at the outlet of wastewater discharged into the...