Turbidity effects on the feeding, respiration and mortality of the copepod Pseudodiaptomus stuhlmanni in the St Lucia Estuary, South Africa

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

doi:10.1016/j.jembe.2015.04.015

Cited by 16 publications

(24 citation statements)

References 30 publications

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“…All studied species are known to be highly tolerant to salinity changes, but the metabolic activities of the diverse taxa can be differently affected by those variations (Calliari et al, 2006). Moreover, other factors such as water turbidity, interspecific differences in activity level and behavioural characteristics can significantly affect metabolic rates (Bode et al, 2013;Jones et al, 2015). Further studies are still needed to simultaneously assess the effect of multiple stressors on zooplankton and better understand the role of the different taxa for the ecosystem functioning.…”

Section: Discussionmentioning

confidence: 99%

Zooplankton metabolism in South African estuaries: does habitat type influence ecological strategies?

Tagliarolo

Porri

Garvie

et al. 2019

Journal of Plankton Research

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Zooplankton community composition, biomass and metabolism can vary drastically over space and time in subtropical estuaries. Changing environmental conditions can affect communities differently, depending on the characteristics of the species involved. In the present study, we compared the rates of oxygen consumption of the dominant zooplankton taxa living in permanently open and in temporally open/closed estuaries. The metabolic response was tested at four temperatures experienced by the animals in their natural environment. Zooplankton from the temporally open/closed estuary showed low activation energies and low rate of metabolism at the highest temperature tested. Animals from the permanently open estuary had higher respiration rates at increased temperatures than those from the open/closed counterpart, with one taxon showing a particularly strong response to temperature increase. Results suggest that the metabolism of zooplankton in subtropical estuaries can be influenced by the environmental conditions experienced and those characteristics need to be accounted for in the development of bioenergetics budgets of species and ecosystems.

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Section: Discussionmentioning

confidence: 99%

Zooplankton metabolism in South African estuaries: does habitat type influence ecological strategies?

Tagliarolo

Porri

Garvie

et al. 2019

Journal of Plankton Research

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“…Although these studies were specific to fish and other zooplankters aside from crab zoeae, collectively they suggest that Uca larvae might not react adversely to silt loading and might even benefit to some degree. Jones et al (2015) showed that the copepod Pseudodiaptomus stuhlmanni experiences deleterious effects above a turbidity level of 1 500 NTU. However, larvae retained within the St Lucia Estuary would experience a maximum turbidity of c. 1 200 NTU (Carrasco et al 2013;Jones et al 2015) and would not be subjected to such high silt loads near the estuary mouth.…”

Section: Discussionmentioning

confidence: 99%

“…Jones et al (2015) showed that the copepod Pseudodiaptomus stuhlmanni experiences deleterious effects above a turbidity level of 1 500 NTU. However, larvae retained within the St Lucia Estuary would experience a maximum turbidity of c. 1 200 NTU (Carrasco et al 2013;Jones et al 2015) and would not be subjected to such high silt loads near the estuary mouth. Cyrus (1992) estimated that the maximum turbidity attained in the mouth and Narrows region was approximately 280 NTU, whereas recent data shows that turbidity in this region has attained a maximum value of 286 NTU (Figure 2b).…”

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%

“…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. For this reason, a maximum turbidity level of 1 000 NTU was considered to be an adequate experimental limit.…”

Section: Silt Tolerancementioning

confidence: 99%

See 2 more Smart Citations

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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A new technique for rapid assessment of eutrophication status of coastal waters using a support vector machine

Kong

Che

et al. 2017

J. Ocean. Limnol.

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Turbidity effects on the feeding, respiration and mortality of the copepod Pseudodiaptomus stuhlmanni in the St Lucia Estuary, South Africa

Cited by 16 publications

References 30 publications

Zooplankton metabolism in South African estuaries: does habitat type influence ecological strategies?

Zooplankton metabolism in South African estuaries: does habitat type influence ecological strategies?

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

A new technique for rapid assessment of eutrophication status of coastal waters using a support vector machine

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