Articles by Keyword: Trophic Interactions

Search results for Trophic Interactions

We found 79 results for you
  1. Intra-annual variation of arthropod-plant interactions and arthropod trophic structure in an endangered grassland in the Free State province, South Africa

    Intra-annual variation of arthropod-plant interactions and arthropod trophic structure in an endangered grassland in the Free State province, South Africa

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Arthropods are valuable biological indicators owing to strong relationships with primary producers. The supposition that arthropod-plant interactions are constant over seasons was tested using Mantel tests on correlations between these groups. A total of 78 plant species and 108 arthropod...
  2. Simulations of fishing effects on the southern Benguela fish community using an individual-based model: learning from a comparison with ECOSIM

    Simulations of fishing effects on the southern Benguela fish community using an individual-based model: learning from a comparison with ECOSIM

    Item type: Journal Article • Journal: African Journal of Marine Science
    By applying an individual-based model (OSMOSE) to the southern Benguela ecosystem, a multispecies analysis is proposed, complementary to that provided by the application of ECOPATH/ECOSIM models. To reconstruct marine foodwebs, OSMOSE is based on the hypothesis that predation is a...
  3. An end-to-end coupled model ROMS-N<sub>2</sub>P<sub>2</sub>Z<sub>2</sub>D<sub>2</sub>-OSMOSE of the southern Benguela foodweb: parameterisation, calibration and pattern-oriented validation

    An end-to-end coupled model ROMS-N<sub>2</sub>P<sub>2</sub>Z<sub>2</sub>D<sub>2</sub>-OSMOSE of the southern Benguela foodweb: parameterisation, calibration and pattern-oriented validation

    Item type: Journal Article • Journal: African Journal of Marine Science
    In order to better understand ecosystem functioning under simultaneous pressures (e.g. both climate change and fishing pressures), integrated modelling approaches are advocated. We developed an end-to-end model of the southern Benguela ecosystem by coupling the high trophic level model OSMOSE...
  4. Trophic interactions amongst the plankton in the temporarily open/closed East Kleinemonde Estuary, South Africa

    Trophic interactions amongst the plankton in the temporarily open/closed East Kleinemonde Estuary, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The trophic interactions between bacteria, phytoplankton, nanoflagellates (2–20 μm), microzooplankton (20–200 μm) and mesozooplankton (200–2 000 μm) were investigated in winter and summer in the temporarily open/closed East Kleinemonde Estuary, Eastern Cape. During winter the phytoplankton community was dominated by...
  5. Do inter-colony differences in Cape fur seal foraging behaviour reflect large-scale changes in the northern Benguela ecosystem?

    Do inter-colony differences in Cape fur seal foraging behaviour reflect large-scale changes in the northern Benguela ecosystem?

    Item type: Journal Article • Journal: African Journal of Marine Science
    The northern Benguela ecosystem adjoining Namibia has undergone considerable changes in recent decades, with reductions and northwards shifts of key prey species that have had severe implications for marine top predator populations. We investigated how such environmental variability may impact...
  6. Intraguild predation and partial consumption of blue sharks <em>Prionace glauca</em> by Cape fur seals <em>Arctocephalus pusillus pusillus</em>

    Intraguild predation and partial consumption of blue sharks <em>Prionace glauca</em> by Cape fur seals <em>Arctocephalus pusillus pusillus</em>

    Item type: Journal Article • Journal: African Journal of Marine Science
    The top-down effects of predators on ecosystem structure and dynamics have been studied increasingly. However, the nature and consequence of trophic interactions between upper-trophic-level predators have received considerably less attention. This is especially the case in marine systems due to...
  7. Kelp gulls prey on the eyes of juvenile Cape fur seals in Namibia

    Kelp gulls prey on the eyes of juvenile Cape fur seals in Namibia

    Item type: Journal Article • Journal: African Journal of Marine Science
    The kelp gull Larus dominicanus is an abundant and highly successful avian predator and scavenger that breeds along the coastline in the Southern Hemisphere, ranging from Antarctica to the tropics. On account of its dietary breadth, wide-ranging foraging strategies, and...
  8. Predatory pelagic fishes of the Bijagós Archipelago (Guinea-Bissau) show high overlap in diets dominated by sardinella

    Predatory pelagic fishes of the Bijagós Archipelago (Guinea-Bissau) show high overlap in diets dominated by sardinella

    Item type: Journal Article • Journal: African Journal of Marine Science
    Knowledge of trophic interactions between the key components of marine communities is required to understand food-web dynamics and develop ecosystem-based management approaches. In West Africa, where fisheries sustain the livelihoods of a significant part of the human population, this understanding...
  9. A field evaluation of the differential tolerance to soil acidity of forty-eight South African maize cultivars

    A field evaluation of the differential tolerance to soil acidity of forty-eight South African maize cultivars

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A field experiment was conducted on a Normandien clay loam (Plinthic Paleudult) to compare the acid tolerance of 48 commercially grown maize (Zea mays L.) cultivars. Cultivars were compared in terms of grain yield, plant height and leaf Al content...
  10. Genotipe—omgewingsinteraksie by sojabone

    Genotipe—omgewingsinteraksie by sojabone

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    'n Gekombineerde variansie-ontleding is uitgevoer op die saadopbrengste en proteïenpersentasies van die saad van 14 sojaboonkultivars wat op nege verskillende lokaliteite oor 3 jaar geëvalueer is. Variansiekomponente geassosieer met elke bron van variasie is beraam. Die verkreë resultate en implikasies...