2001
DOI: 10.1071/mf01100
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Jasus lalandii 'walkouts' or mass strandings in South Africa during the 1990s: an overview

Abstract: Faunal mass mortalities are a sporadic, but not uncommon, feature of the West and South coasts of South Africa. Five mass mortalities of West Coast rock lobsterJasus lalandii, including three of the most severe ever recorded in South Africa, occurred in the 1990s and resulted in the stranding of about 2263 tonnes of lobster. The bulk (97%) of the loss occurred in the last three years of the decade. The five events occurred within an 80 km stretch of coastline that straddled two fishing zones and resulted from … Show more

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Cited by 75 publications
(41 citation statements)
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“…Differential growth and exploitation of sub-stocks of sardine occurring east and west of Cape Agulhas may have caused the shift in the distribution of this species, but environmentally mediated changes cannot be discarded (Cockcroft et al, 2008;Coetzee et al, 2008). The shift in the distribution of rock lobsters in the 1990s coincided with a decrease in lobster somatic growth rates and a major increase in the number and severity of lobster walkouts induced by low oxygen concentrations to the north of Dassen Island, indicating some underlying environmental cause (Cockcroft, 2001;Cockcroft et al, 2008).…”
Section: Discussionmentioning
confidence: 99%
“…Differential growth and exploitation of sub-stocks of sardine occurring east and west of Cape Agulhas may have caused the shift in the distribution of this species, but environmentally mediated changes cannot be discarded (Cockcroft et al, 2008;Coetzee et al, 2008). The shift in the distribution of rock lobsters in the 1990s coincided with a decrease in lobster somatic growth rates and a major increase in the number and severity of lobster walkouts induced by low oxygen concentrations to the north of Dassen Island, indicating some underlying environmental cause (Cockcroft, 2001;Cockcroft et al, 2008).…”
Section: Discussionmentioning
confidence: 99%
“…In some rare and extreme cases, bloom decay may also lead to the production of hydrogen sulphide (Weeks et al, 2002(Weeks et al, , 2004Matthews and Pitcher, 1996). In the southern Benguela, the occurrence of hypoxic water has been linked to the decay of dense phytoplankton blooms (Monteiro and van der Plas, 2006;Pitcher and Probyn, 2011) and has periodically resulted in mass mortalities of rock lobster and shellfish (Cockcroft, 2001;Pitcher and Weeks, 2006). It is in the nearshore regions, where the orientation of the coastline and the bottom topography strongly influence water column stratification and retention, that these impacts are most significant (Pitcher and Pillar, 2010).…”
Section: Phytoplankton Biomass and Primary Productionmentioning
confidence: 99%
“…If, except perhaps under extreme circumstances (e.g. during Rock Lobster mass walk-outs; Cockcroft 2001), Bank Cormorants at Robben Island are not limited (at the current population level) by a food-imposed carrying capacity, then a paucity of suitable nesting sites may be imposing a density-dependent control on growth of the population. In this case, the simple addition of an alternative structure, for example a platform within the harbour area, might allow Robben Island to support a larger population of this endangered, endemic seabird.…”
Section: Discussionmentioning
confidence: 99%