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Showing 1 to 20 of 33 for “"Langebaan Lagoon"”.
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Depositional processes in Saldanha Bay and Langebaan Lagoon
… aspects of sedimentation in Saldanha Bay and Langebaan Lagoon. On the basis of detailed textural investigations the depositional history of the study area has been established. The sediments in the bay and in the lagoon consist of a fine terrigenous quartz population and a coarser skeletal …
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Circulation through the mouth of Langebaan Lagoon and implications
… 1997 a two-weeks field survey was conducted in Langebaan Lagoon and Saldanha Bay. The aim of this survey was to farther our understanding of the processes driving the mixing and the exchange at the Langebaan Lagoon-Saldanha Bay interface. The parameters measured included currents, water-levels, …
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Flamingo foraging activity as a driver of spatial heterogeneity in Langebaan Lagoon, South Africa
… and macrofaunal community structure in Langebaan Lagoon. The two foraging strategies appear only to differ with regards to prey removal and recolonisation. The more energy intensive, pitforming foraging enables the flamingo to obtain higher quantities of Urothoe grimaldii in addition to …
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A study of the relationship between environmental conditions and salt marsh zonation at Langebaan Lagoon
… patterns in the salt marsh communities of Langebaan Lagoon. The study area forms part of the West Coast National Park and is the largest tract of saltmarsh in South Africa. An overview of the current literature on salt marsh ecology is discussed and a synopsis of local research of salt …
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Exploitation and biology of the bait organism Callianassa kraussi Stebbing (Crustacea: Decapoda: Thalassinidae) in Langebaan Lagoon
… of prawns (Callianassa & Upogebia spp.) in Langebaan Lagoon, primarily for bait collecting, were assessed using field experiments and observations. Langebaan Lagoon has been a proclaimed National Park for 20 years and a proclaimed Marine Protected Area since 2000. The area is zoned for …
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Physico-chemical factors influencing the spatial and temporal distribution of the seagrass Zostera capensis in Langebaan lagoon
… Zostera capensis biomass and distribution in Langebaan Lagoon. Five sites within the Langebaan Lagoon were selected and within these sites a minimum of three and maximum of ten Z. capensis beds were sampled, depending on the availability of the beds. Five 10 cm core samples were collected from …
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Using benthic microalgae as an indicator of recreational disturbance associated with bait collection and trampling in Langebaan Lagoon, South Africa
… utilized a rapid, optical tool (BenthoTorch) in Langebaan Lagoon, to determine its effectiveness in quantifying the effects of disturbance by humans (in the form of bait collecting and trampling) and using intertidal benthic microalgae as an indicator. Specifically, the instrument was used in …
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Assessing the effects of trampling and bait-collecting on population, morphological and reproductive metrics of a key ecosystem engineer in Langebaan Lagoon
Coastal sedimentary habitats, like Langebaan Lagoon, provide vital ecological and economic services that many human livelihoods rely upon. However, they are vulnerable to multiple human-related disturbances such as intense bait collection and trampling, that compromise ecosystem resilience and …
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Identification and distribution of South Africa's non-native beachfleas (Crustacea: Amphipoda: Talitridae)
… of Orchestia gammarellus were restricted to - Langebaan Lagoon, Knysna and Milnerton Lagoon; while Platorchestia platensis had been recorded from Knysna and '34°S/19°E' (Gansbaai area). To verify this information, historical records were re-examined and 16 estuaries and lagoons in the Western …
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The feeding ecology of curlew sandpipers "Calidris Ferruginea" in the South-Western Cape, South Africa
… to curlew sandpipers Calidris ferruginea at Langebaan Lagoon (33°s, 18°E), South Africa, are described for the period February 1974 - March 1975. Seasonal changes in the diet of curlew sandpipers foraging in the intertidal sandflats and marshes were studied, and the food taken by male and …
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The effects of the macroalga Gracilaria gracilis and increasing temperatures on the performance of the endemic Cape eelgrass Zostera capensis
… the seagrass Zostera capensis, which occurs in Langebaan Lagoon, South Africa over a seven-week period. Results from the laboratory experiment revealed that G. gracilis did not significantly affect the performance of Z. capensis although temperature did result in greater leaf width, fouling and …
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The feeding ecology of curlew sandpipers Calidris ferrugineol in the South - Western Cape, South Africa
… to curlew sandpipers Calidris ferruginea at Langebaan Lagoon (33°s, 18°E), South Africa, are described for the period February 1974 - March 1975. Seasonal changes in the diet of curlew sandpipers foraging in the intertidal sandflats and marshes were studied, and the food taken by male and …
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The exploitation of fish during the Holocene in the South-Western Cape, South Africa
… localities in South Africa; Elands Bay and Langebaan Lagoon on the west coast, and False Bay on the Cape Peninsula. Chapter One is an introductory account of ichthyology, its usefulness in archaeological research and the range of analytical work done in South Africa, whilst Chapter Two is an …
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Population genetic studies of economically important Gracilaria and Gracilariopsis (Rhodophyta) in the south western Cape
… were connected from various locations within the Langebaan Lagoon-Saldanha Bay system and the nearby St. Helena Bay. Their positions were accurately mapped with the aid of a Global Positioning System (GPS). Reproductive structures are of great taxonomic importance within the Gracilariaceae. The …
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Benthic metrics as indicators of human disturbance in a marine-dominated lagoon
… and ecologically significant marine-dominated lagoons; Langebaan lagoon. This lagoon is managed through the designation of three zones (A, B and C) with contrasting human presence. Public access, recreation and bait-collecting is permitted in A, but no bait colleting is permitted in B. Human …
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The ecological effects of collecting Callianassa kraussi Stebbing and Upogebia africana (Ortmann) for bait : impacts on the biota of an intertidal sandflat
… Upogebia africana for bait were assessed at Langebaan Lagoon, South Africa, through surveys, observations and long-term experimental analyses. While only a small proportion of the prawns is removed from the lagoon annually, amounting to no more than 0.01 for the total lagoon, the physical …
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Interactive effects of temperature and grazing by seagrass limpets (Siphonaria compressa and Fissurella mutabilis) on seagrass (Zostera capensis)
… has declined by 38% over the last 50 years in Langebaan Lagoon, with associated losses of invertebrate abundance by 70% in certain areas. Two limpets, Siphonaria compressa and Fissurella mutabilis depend on Zostera capensis for their survival in Langebaan Lagoon, feeding on epiphytic diatoms, …
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Drivers of burrow symbiont distribution in a softsediment system: host abundance or burrow trophic environment?
The Langebaan Lagoon sandflats are dominated by the burrowing activities of thalassinid shrimps. Their burrows are home to various burrow symbionts including a commensal shrimp (Betaeus jucundus), a six-legged crab (Spiroplax spiralis) and a scaleworm (Antinoe lactea). Little work has been …
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Age, growth, reproductive biology and diet of Spondyliosoma emarginatum (Cuvier 1830) in the West Coast National Park, South Africa
… of steentjies (Spondyliosoma emarginatum) in Langebaan Lagoon were recorded between September 2004 and February 2005. Sagittal otoliths were extracted and age estimates recorded from both whole and sectioned otoliths in order to estmate growth and mortality parameters. A total of 302 …
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Biology, movement behaviour and spatial dynamics of an exploited population of smooth hound shark mustelus mustelus around a coastal marine protected area in South Africa
… neonates and pregnant females inside the Langebaan Marine Protected Area indicates it to be a nursery ground for this species. The largest part of the diet of M. mustelus consisted of three species of crustaceans: Hymenosoma orbiculare, Upogebia africana, Callichirus kraussi. No …
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