A holistic approach to the exploitation of intertidal stocks: limpets as a case study

Eekhout, S.; Raubenheimer, C. M.; Branch, George M.; Bosman, A. L.; Bergh, M. O.

doi:10.2989/02577619209504759

Cited by 30 publications

(35 citation statements)

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“…In addition, this limpet has been considered for commercial exploitation in South Africa (Branch, 1974a,b;Eekhout et al, 1992;Bustamante et al, 1994Bustamante et al, , 1995. We developed our model around four central questions.…”

Section: Study Aimsmentioning

confidence: 99%

“…A per-recruit model (Beverton and Holt, 1957) was constructed to simulate the population dynamics of C. granatina using growth, mortality and reproductive estimates obtained from Branch (1974a,b) and Eekhout et al (1992). The per-recruit model was modified to account for monthly population dynamic effects and was similar to that of Govender et al (2006).…”

Section: Base Case Modelmentioning

confidence: 99%

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Are closed fishing seasons an effective means of increasing reproductive output?

2007

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Section: Study Aimsmentioning

confidence: 99%

Section: Base Case Modelmentioning

confidence: 99%

Are closed fishing seasons an effective means of increasing reproductive output?

2007

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“…Bottom-up effects in this system clearly had an important effect on community structure and dynamics. Since earlier studies (Branch and Griffiths, 1988;Eekhout et al, 1992) had shown negative effects of limpet grazing on benthic algae, these bottom-up subsidies of grazers evidently resulted in top-down control of the in situ algae by the grazers.…”

Section: South Africamentioning

confidence: 99%

Top-down and bottom-up community regulation in marine rocky intertidal habitats

Menge

2000

Journal of Experimental Marine Biology and Ecology

424

322

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“…Patellid limpets are intolerant of inundation (Marshall and McQuaid, 1989), and their deletion in areas of inundation leads to a proliferation of algae. Reductions of the densities of grazers, with concomitant dominance by foliose algae, often typify rocky-shore communities disturbed by sediments (Littler and Murray, 1975;Hawkins and Hartnoll, 1983;Littler et al, 1983;Hockey and Bosman, 1986;Eekhout et al, 1992). Inundation by sand may also promote siphonariid limpets, because they are not only tolerant of sand but inferior competitors with patellids.…”

Section: Effects Of Sedimentationmentioning

confidence: 99%

The effects of sediment deposits from Namibian diamond mines on intertidal and subtidal reefs and rock lobster populations

Pulfrich

Parkins

Branch

et al. 2002

Aquatic Conservation

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ABSTRACT1. Extensive diamond mining occurs on land and in the sea on the west coasts of South Africa and Namibia, raising fears that diamond-mining activities may impact commercial rock lobster fisheries and benthic communities. To explore this possibility, the effects of the diamond-mining finesdischarge on intertidal and subtidal rocky-shore communities and on the population structure of the rock lobster Jasus lalandii were assessed at Elizabeth Bay.2. Sampling over six years at sites covering a range of wave exposures compared impacted sites with comparable reference sites never exposed to the fines. Percentage cover and densities of benthic organisms were recorded on both intertidal and subtidal reefs. Rock lobster abundance was estimated from counts and catch-per-unit-effort, and their length frequencies and sex ratios compared in impacted and reference areas.3. The deposition of fines had no effect at wave-exposed sites, but did impact intertidal and subtidal communities at sheltered localities where fines accumulated because wave action was insufficient to disperse them. Reductions of grazers, proliferation of algae and increased dominance by filter-feeders were recorded at the impacted sites and persisted throughout the monitoring programme. Differences in community structure associated with different levels of wave exposure were, however, greater than those produced by depositing fines. The detected effects of fines-deposits on the benthos were local and likely to be reversible after cessation of mining.4. The fines-deposit had no detectable effects on the sex-ratio, size or abundance of rock lobsters, indicating that there is no conflict between the deposition of fines and the fishery for rock lobsters, although substantial inter-site variability makes it difficult to regard the results as definitive.

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A holistic approach to the exploitation of intertidal stocks: limpets as a case study

Cited by 30 publications

References 0 publications

Are closed fishing seasons an effective means of increasing reproductive output?

Are closed fishing seasons an effective means of increasing reproductive output?

Top-down and bottom-up community regulation in marine rocky intertidal habitats

The effects of sediment deposits from Namibian diamond mines on intertidal and subtidal reefs and rock lobster populations

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