Turbidity effects on feeding and mortality of the copepod Acartiella natalensis (Connell and Grindley, 1974) in the St Lucia Estuary, South Africa

Carrasco, Nicola K.; Perissinotto, Renzo; Jones, Salome

doi:10.1016/j.jembe.2013.04.016

Cited by 27 publications

(23 citation statements)

References 26 publications

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“…A comprehensive revision has been recently published24. The presence of particulate matter has been invoked as the cause for salp and copepod deaths in coastal environments113.…”

Section: Discussionmentioning

confidence: 99%

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Glacial melting: an overlooked threat to Antarctic krill

Fuentes

Alurralde

Meyer

et al. 2016

Sci Rep

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Strandings of marine animals are relatively common in marine systems. However, the underlying mechanisms are poorly understood. We observed mass strandings of krill in Antarctica that appeared to be linked to the presence of glacial meltwater. Climate-induced glacial meltwater leads to an increased occurrence of suspended particles in the sea, which is known to affect the physiology of aquatic organisms. Here, we study the effect of suspended inorganic particles on krill in relation to krill mortality events observed in Potter Cove, Antarctica, between 2003 and 2012. The experimental results showed that large quantities of lithogenic particles affected krill feeding, absorption capacity and performance after only 24 h of exposure. Negative effects were related to both the threshold concentrations and the size of the suspended particles. Analysis of the stomach contents of stranded krill showed large quantities of large particles ( > 106 μm3), which were most likely mobilized by glacial meltwater. Ongoing climate-induced glacial melting may impact the coastal ecosystems of Antarctica that rely on krill.

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“…A comprehensive revision has been recently published24. The presence of particulate matter has been invoked as the cause for salp and copepod deaths in coastal environments113.…”

Section: Discussionmentioning

confidence: 99%

“…In copepods, inorganic particles affect feeding efficiency, carbon turnover and egg production12 as well as mortality rates13. Deleterious effects such as reduced foraging, growth and changes in physiological condition have also been observed in fish14.…”

mentioning

confidence: 99%

Glacial melting: an overlooked threat to Antarctic krill

Fuentes

Alurralde

Meyer

et al. 2016

Sci Rep

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“…Although the negative effects of turbidity on zooplankton filter-feeding have been well documented (e.g. Hart 1988;Carrasco et al 2013), survival under high turbidity levels is not always adversely affected (Lougheed and Chow-Fraser 1998;Carrasco et al 2013). It is possible that turbidity might protect zooplankton Downloaded by [University of Sussex Library] at 00:11 05 July 2016 from predators (Gardner 1981) and provide an additional source of nutrition, in the form of organic matter adsorbed to suspended particulates (Arruda et al 1983).…”

Section: Discussionmentioning

confidence: 99%

“…For the shock experiment, filtered estuarine water was used to make turbidity treatments of 0, 50, 100, 500 and 1 000 NTU, and zoeae were then placed directly into each treatment. Turbidity in the mouth and Narrows region has never been recorded to exceed 300 NTU (Carrasco et al 2013;Jones et al 2015). However, Jones et al (2015) point out that the excessive turbidity (2 500 NTU) of the nearby Mfolozi system could potentially increase the turbidity of the St Lucia system, if attempts to reconnect the two systems as they have been in the past are successful.…”

Section: Silt Tolerancementioning

confidence: 99%

Suspended silt and salinity tolerances of the first zoeal stage of the fiddler crab Uca annulipes (Decapoda: Brachyura) and why marine connectivity is essential to the survival of the species

Peer

Miranda

Perissinotto

2016

African Journal of Marine Science

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Online) Journal homepage: http://www.tandfonline.com/loi/tams20 Suspended silt and salinity tolerances of the first zoeal stage of the fiddler crab Uca annulipes (Decapoda: Brachyura) and why marine connectivity is essential to the survival of the species N Peer, NAF Miranda & R PerissinottoSuspended silt and salinity tolerances of the first zoeal stage of the fiddler crab Uca annulipes (Decapoda: Brachyura) and why marine connectivity is essential to the survival of the species Fiddler crabs (Uca spp.) undergo the zoeal stage of development in open-ocean waters, where they experience stable salinity levels, low turbidity and reduced predation. The St Lucia estuarine system has undergone many geomorphological changes, both natural and anthropogenic, and the estuary mouth has been closed since the early 2000s. Despite recent attempts to improve marine connectivity, it remains limited, occurring primarily on the flood tide through channels connected to the adjacent Mfolozi River. Larval export from the St Lucia Estuary is therefore almost non-existent. A laboratory study was undertaken to examine the silt and salinity tolerance of Uca annulipes first stage zoeae, to investigate whether survival in the closed-estuary conditions would be possible. Salinity tolerance was narrow, with zoeae displaying 100% mortality at salinities <20 and >35 after five days. Zoeae were widely tolerant to silt loading and did not display a significant decrease in survival over a range of 0-1 000 NTU. A limited salinity tolerance is in accordance with the life-history strategy of fiddler crabs, and a high tolerance to turbid waters can be advantageous to small-bodied merozooplankton. Given the stenohaline nature of the zoeae, marine connectivity is therefore essential for the persistence of U. annulipes in this estuarine habitat.

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“…Such high turbidity have been related to the increased amount of run-offs which is common in municipal areas (Löptien and Meier, 2011). Agricultural activities in and around wetlands contributing to increased turbidity has also been reported (Carrasco et al, 2013) and this explains the high values at S7 and S8. During the wet season, the high turbidity at S2 may perhaps be due to inadequate treatment of TSS in the lagoon prior to discharge.…”

Section: Sampling Point Tss Load (Mg Smentioning

confidence: 92%

Seasonal macrophyte diversity and water quality in an urban wetland

Okello¹,

Opio²,

Kansiime³

2017

Afr. J. Environ. Sci. Technol.

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The ecosystem services of encroached urban wetlands that receive wastewater and surface run-offs have become more challenging due to climate variability. Our study assessed the seasonal macrophyte diversity and water quality of the streams flowing into and out from Pece wetland in Gulu Municipality. The macrophyte species in the wetland were sampled along five transects. Water samples from the streams were also collected and analyzed in the laboratory. Results indicated forty two macrophyte species that were in twenty four families. Macrophyte diversity and equitability were higher at the wetland edge, but were not significantly different in the entire wetland (p = 0.41, respectively). The recorded faecal coliforms (FC), total suspended solids, electrical conductivity and turbidity in the streams were higher in the wet season than the dry season. The wetland doubled the retention of FC during the dry season and relatively less retention of total suspended solids was recorded in the dry season. The urban expansion and farming might alter the macrophyte abundance and richness in Pece wetland, thus affecting the ecosystem services.

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Turbidity effects on feeding and mortality of the copepod Acartiella natalensis (Connell and Grindley, 1974) in the St Lucia Estuary, South Africa

Cited by 27 publications

References 26 publications

Glacial melting: an overlooked threat to Antarctic krill

Glacial melting: an overlooked threat to Antarctic krill

Suspended silt and salinity tolerances of the first zoeal stage of the fiddler crab Uca annulipes (Decapoda: Brachyura) and why marine connectivity is essential to the survival of the species

Seasonal macrophyte diversity and water quality in an urban wetland

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