Patterns of shore utilization in a metropolitan area: The Cape Peninsula, South Africa

Herwerden, Lynne van; Griffiths, Charles L.; Bally, R.; Blaine, M.; Plessis, Cole du

doi:10.1016/0951-8312(89)90067-2

Cited by 17 publications

(5 citation statements)

References 10 publications

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“…However, the curve had a bimodal distribution with two peak density hours at 12 and 5 pm, with an important decrease in the presence of users in between. Similar distributions were found by van Herwerden et al (1989) and Sinclair-Hannocks (1994) in relation to urban beaches in South Africa.…”

Section: Discussionsupporting

confidence: 84%

Climate change and tourism: Impacts and vulnerability in coastal Europe

Moreno

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Section: Discussionsupporting

confidence: 84%

Climate change and tourism: Impacts and vulnerability in coastal Europe

Moreno

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“…Females are particularly at risk, due to their frequent use of the Inshore areas of the Bay, which are impacted by fishing, pollution, and damage to natural habitat from coastal development. Furthermore, the peak in female use of the Inshore region in the summer months corresponds with the annual recreational peak for this zone [64]. Shark attacks (on average one per year in False Bay since 1960) put tremendous pressure on local conservation and management authorities to mitigate these events and there are frequent calls for the removal of sharks e.g.…”

Section: Discussionmentioning

confidence: 99%

Residency, Habitat Use and Sexual Segregation of White Sharks, Carcharodon carcharias in False Bay, South Africa

et al. 2013

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White sharks (Carcharodon carcharias) are threatened apex predators and identification of their critical habitats and how these are used are essential to ensuring improved local and ultimately global white shark protection. In this study we investigated habitat use by white sharks in False Bay, South Africa, using acoustic telemetry. 56 sharks (39 female, 17 male), ranging in size from 1.7–5 m TL, were tagged with acoustic transmitters and monitored on an array of 30 receivers for 975 days. To investigate the effects of season, sex and size on habitat use we used a generalized linear mixed effects model. Tagged sharks were detected in the Bay in all months and across all years, but their use of the Bay varied significantly with the season and the sex of the shark. In autumn and winter males and females aggregated around the Cape fur seal colony at Seal Island, where they fed predominantly on young of the year seals. In spring and summer there was marked sexual segregation, with females frequenting the Inshore areas and males seldom being detected. The shift from the Island in autumn and winter to the Inshore region in spring and summer by females mirrors the seasonal peak in abundance of juvenile seals and of migratory teleost and elasmobranch species respectively. This study provides the first evidence of sexual segregation at a fine spatial scale and demonstrates that sexual segregation in white sharks is not restricted to adults, but is apparent for juveniles and sub-adults too. Overall, the results confirm False Bay as a critical area for white shark conservation as both sexes, across a range of sizes, frequent the Bay on an annual basis. The finding that female sharks aggregate in the Inshore regions when recreational use peaks highlights the need for ongoing shark-human conflict mitigation strategies.

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“…Patterns of shellfish exploitation vary spatially, temporally and between species (Bosman et al 1988;Durán and Castilla 1989;van Herwerden et al 1989;Underwood and Chapman 1996). Some geographic patterns of distribution and abundance of molluscs are general, with little variation at small scales (Forster et al 2003), whereas other patterns are specific to particular places or times (Morrissey et al 1992;Underwood and Chapman 1998).…”

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confidence: 99%

Marine reserve effects on population density and size structure of commonly and rarely exploited limpets in South Africa

Nakin

McQuaid

2014

African Journal of Marine Science

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Marine reserves are commonly used to conserve living resources, but their effectiveness where policing is difficult is unclear. We compared monthly population density and size structure data collected over 20 months for two rarely and two commonly exploited intertidal limpets inside and outside reserves in South Africa. Densities were greater inside reserves, but significantly so in very few months. Unexpectedly, no significant reserve effect was detected for the territorial Scutellastra longicosta, shown by surveys to be favoured by harvesters. Reserve effects for the rarely exploited S. granularis probably result from indirect effects of higher barnacle cover in reserves where trampling is reduced, while interviews indicated that Cellana capensis is not targeted but large individuals are sometimes misidentified and hence are harvested outside the reserve. There were few reserve effects on mean or mean maximum size. The results indicate a gradient of exploitation among species and sites. One non-reserve site was more heavily exploited than the other, while one reserve experienced more poaching than the other. The effectiveness of marine reserves thus differed between reserves and among species. Exploited limpets were generally larger and at higher densities in reserves, but these effects were rarely statistically significant, indicating that reserve effects are weak compared to natural variability, probably reflecting ineffective policing.

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Patterns of shore utilization in a metropolitan area: The Cape Peninsula, South Africa

Cited by 17 publications

References 10 publications

Climate change and tourism: Impacts and vulnerability in coastal Europe

Climate change and tourism: Impacts and vulnerability in coastal Europe

Residency, Habitat Use and Sexual Segregation of White Sharks, Carcharodon carcharias in False Bay, South Africa

Marine reserve effects on population density and size structure of commonly and rarely exploited limpets in South Africa

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