https://commons.ufh.ac.za/vital/access/manager/Index ${session.getAttribute("locale")} 5 Physical and biological variability in the Antarctic Polar Frontal Zone: report on research cruise 103 of the MV SA Agulhas https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6910 Wed 31 Jul 2024 11:17:24 SAST ]]> Phylogeographic structure of the caridean shrimp Palaemon peringueyi in South Africa: further evidence for intraspecific genetic units associated with marine biogeographic provinces https://commons.ufh.ac.za/vital/access/manager/Repository/vital:74392 Wed 17 Jul 2024 09:02:57 SAST ]]> Impacts of marine biogeographic boundaries on phylogeographic patterns of three South African estuarine crustaceans https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6548 Wed 10 Jul 2024 12:15:43 SAST ]]> Surface distribution of microphytoplankton of the south-west Indian Ocean along a repeat transect between Cape Town and the Prince Edward Islands https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6933 20 μm) species composition and distribution along a repeat transect between Cape Town and the Prince Edward Islands were investigated in early austral autumn (April/May) 1996. Samples were collected at approximately 30 nautical mile intervals for the analysis of size-fractionated chl-a and the identification and enumeration of microphytoplankton species. Peaks in total chl-a (>1 μg 1 [superscript -1]) were recorded at the Subtropical Convergence (STC), at the Sub-Antarctic Front (SAF) and in the waters surrounding the Prince Edward Islands. In addition, a minor peak in chl-a concentration was recorded in the continental shelf waters. At stations where elevated chl-a concentrations were recorded, microphytoplankton generally formed a substantial contribution (-10%) to total chlorophyll. Outside these regions, total chlorophyll concentrations were lower (<0.9 μg 1 [superscript -1]) and almost entirely dominated by nano- and picophytoplankton, which contributed >95% of the total. Microphytoplankton species composition along both transects were dominated by chain-forming species of the genera Chaetoceros (mainly C. neglectum, C. peruvianus and C. constrictus), Nitzschia spp. and Pseudoeunotia doliolus. Cluster and ordination analysis based on species composition identified five distinct microphytoplankton assemblages, which were closely associated with the different water masses in the region between Cape Town and the Prince Edward Islands. The microphytoplankton species composition and biogeographic zones identified during this investigation are in general agreement with similar studies conducted in the south-west Indian Ocean during the austral summer, which suggests that there are little seasonal trends in both the microphytoplankton species composition and biogeographic zonation.]]> Wed 10 Jul 2024 11:50:30 SAST ]]> Conserving pattern and process in the Southern Ocean: designing a Marine Protected Area for the Prince Edward Islands https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6881 Wed 10 Jul 2024 10:33:57 SAST ]]> An assessment of the effect of rotenone on selected non-target aquatic fauna: https://commons.ufh.ac.za/vital/access/manager/Repository/vital:38214 Wed 10 Jul 2024 08:52:55 SAST ]]> Examining intraspecific multiple predator effects across shifting predator sex ratios: https://commons.ufh.ac.za/vital/access/manager/Repository/vital:38941 Wed 10 Jul 2024 08:50:37 SAST ]]> Growth and longevity of Exosphaeroma hylocoetes (Isopoda) under varying conditions of salinity and temperature https://commons.ufh.ac.za/vital/access/manager/Repository/vital:74560 Tue 30 Jul 2024 02:52:32 SAST ]]> Physical and biological processes at the Subtropical Convergence in the South-west Indian Ocean https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6966 0.05). The zooplankton community was dominated, numerically and by biomass, by mesozooplankton comprising mainly copepods of the genera, Oithona,Paraeuchaeta, Pleuromamma, Calanus and Clausocalanus. An exception was recorded at those stations in the region of the front where the tunicate, Salpa thompsoni, dominated the total zooplankton biomass.]]> Tue 27 Aug 2024 15:13:27 SAST ]]> Variability in pH, fCO2, oxygen and flux of CO2 in the surface water along a transect in the Atlantic sector of the Southern Ocean https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6847 Tue 06 Aug 2024 12:04:06 SAST ]]> Prince Edward Islands' offshore oceanographic study: report of research cruise April-May 1997 https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6939 Tue 06 Aug 2024 12:04:06 SAST ]]> An Assessment of the Effect of Rotenone on Selected Non-Target Aquatic Fauna https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35579 Tue 06 Aug 2024 11:57:13 SAST ]]> Research cruise of the Scandinavian/South African Antarctic expedition, December 1997 to February 1998 https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6934 Thu 25 Apr 2024 15:49:41 SAST ]]> Temporal variability in the effects of grazing by the territorial limpet Patella longicosta on the productivity of the crustose alga Ralfsia verrucosa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6935 Thu 25 Apr 2024 15:49:12 SAST ]]> The Southern Ocean Group at Rhodes University: seventeen years of biological oceanography in the Southern Ocean reviewed https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6834 Thu 25 Apr 2024 15:47:55 SAST ]]> In situ feeding rates of the copepods, Pseudodiaptomus hessei and Acartia longipatella, in a temperate, temporarily open/closed Eastern Cape estuary https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6901 Thu 25 Apr 2024 15:47:30 SAST ]]> An interdisciplinary cruise dedicated to understanding ocean eddies upstream of the Prince Edward Islands https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6830 8.5°C, salinity >34.2), suggesting that the SAF lay extremely far to the south. In the southeast corner water masses were typical of the Antarctic zone, showing a distinct subsurface temperature minimum of <2.5°C. Total integrated chl-a concentration during the survey ranged from 4.15 to 22.81 mg chl-a m[superscript (-2)], with the highest concentrations recorded at stations occupied in the frontal region. These data suggest that the region of the South-West Indian Ridge represents not only an area of elevated biological activity but also acts as a strong biogeographic barrier to the spatial distribution of zooplankton.]]> Thu 25 Apr 2024 15:46:55 SAST ]]> Monitoring the oceanic flow between Africa and Antarctica: report of the first Good Hope cruise https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6832 Thu 25 Apr 2024 15:46:11 SAST ]]> Anti-oesophageal cancer activity in extracts of deep-water Marion Island sponges https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6569 Thu 25 Apr 2024 15:45:37 SAST ]]> The importance of phytoplankton size in mediating trophic interactions within the plankton of a southern African estuary https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6928 200 μm) was investigated on three occasions in a warm temperate, temporarily open/closed estuary situated along the southern African coastline. Results of the investigation indicated that the microheterotrophs represented the most important consumers of bacteria and chlorophyll (chl)-a <5.0 μm. The low impact of the mesozooplankton on the bacteria and chl-a <5.0 μm during the study appeared to be related to the inability of the larger zooplankton to feed efficiently on small particles. During those periods when total chl-a concentration was dominated by picophytoplankton (<2.0 μm) and microphytoplankton (>20 μm), mesozooplankton were unable to feed efficiently on the chl-a due to feeding constraints. In response to the unfavorable size structure of the phytoplankton assemblages, mesozooplankton appeared to consume the microheterotrophs. The negative impact of the mesozooplankton on the microheterotrophs resulted in a decrease in the impact of these organisms on the bacteria and the chl-a <5.0 μm. This result is consistent with the predator-prey cascades. On the other hand, when the total chl-a was dominated by nanophytoplankton (2–20 μm), mesozooplankton were able to feed directly on the phytoplankton. Results of the study indicate that size structure of the phytoplankton assemblages within estuaries plays an important role in mediating the trophic interactions between the various components of the plankton food web.]]> Thu 25 Apr 2024 15:44:49 SAST ]]> Recovery of the critically endangered river pipefish, Syngnathus watermeyeri, in the Kariega Estuary, Eastern Cape province https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6965 Thu 25 Apr 2024 15:43:21 SAST ]]> The effects of increased freshwater inflow on metal enrichment in selected Eastern Cape estuaries, South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6967 Thu 25 Apr 2024 15:41:41 SAST ]]> The diet of the calanoid copepod, Pseudodiaptomus hessei, in a permanently open southern African estuary inferred from fatty acid analyses https://commons.ufh.ac.za/vital/access/manager/Repository/vital:29758 Thu 25 Apr 2024 15:38:59 SAST ]]> Residency patterns and migration dynamics of adult bull sharks (Carcharhinus leucas) on the east coast of southern Africa: https://commons.ufh.ac.za/vital/access/manager/Repository/vital:38213 Thu 25 Apr 2024 15:37:22 SAST ]]> Fatty acid profiles reveal temporal and spatial differentiation in diets within and among syntopic rocky shore suspension-feeders: https://commons.ufh.ac.za/vital/access/manager/Repository/vital:38238 Thu 25 Apr 2024 15:36:26 SAST ]]> Colonisation and community structure of benthic diatoms on artificial substrates following a major flood event: a case of the Kowie River (Eastern Cape, South Africa) https://commons.ufh.ac.za/vital/access/manager/Repository/vital:38239 Thu 25 Apr 2024 15:35:23 SAST ]]> Assessment of the spatial and temporal variations in periphyton communities along a small temperate river system: A multimetric and stable isotope analysis approach https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35580 Thu 25 Apr 2024 15:31:54 SAST ]]> A re-examination of the type material of Entomoneis paludosa (W Smith) Reimer and its morphology and distribution in African waters https://commons.ufh.ac.za/vital/access/manager/Repository/vital:29440 Thu 25 Apr 2024 15:29:57 SAST ]]> Emergent effects of structural complexity and temperature on predator–prey interactions https://commons.ufh.ac.za/vital/access/manager/Repository/vital:29444 Thu 25 Apr 2024 15:27:03 SAST ]]> Diatom-based water quality monitoring in southern Africa: challenges and future prospects https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35590 Thu 25 Apr 2024 15:22:38 SAST ]]> Assessment of water quality based on diatom indices in a small temperate river system, Kowie River, South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35514 0.05) between the diatom indices’ values and the nutrient variables. The absence of any significant correlations between the diatom indices’ values and selected physico-chemical variables suggests that indices developed in other regions of the world may not be suitable for temperate southern African rivers.]]> Thu 25 Apr 2024 15:20:17 SAST ]]> Occurrence of Indo-Pacific bottlenose dolphins (Tursiops aduncus) off the Wild Coast of South Africa using photographic identification: https://commons.ufh.ac.za/vital/access/manager/Repository/vital:40439 Thu 25 Apr 2024 15:17:09 SAST ]]> Macrofaunal community structure in the littoral zone of a freshwater-deprived, permanently open Eastern Cape estuary https://commons.ufh.ac.za/vital/access/manager/Repository/vital:74174 Thu 11 Jul 2024 23:59:59 SAST ]]> Connectivity through allochthony: Reciprocal links between adjacent aquatic and terrestrial ecosystems in South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:73454 Mon 17 Jun 2024 06:39:37 SAST ]]> Growth and longevity of Exosphaeroma hylocoetes (Isopoda) under varying conditions of salinity and temperature https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35630 Mon 13 May 2024 14:53:49 SAST ]]> Biological responses to a resumption in river flow in a freshwater-deprived, permanently open Southern African estuary https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6886 Mon 08 Jul 2024 06:48:51 SAST ]]> The population dynamics of the estuarine isopod Exosphaeroma hylocoetes (Barnard, 1940) within three temporarily open/closed southern African estuaries https://commons.ufh.ac.za/vital/access/manager/Repository/vital:74662 Fri 02 Aug 2024 11:24:30 SAST ]]>