The Influence of Freshwater Inflow on the Nature, Amount and Distribution of Seston in Estuaries of the Eastern Cape, South Africa

Grange, N.; Allanson, B. R.

doi:10.1006/ecss.1995.0028

Cited by 63 publications

(56 citation statements)

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“…The changes in these rivers have significantly affected hydrographic conditions, salinity and temperature patterns, nutrient loads, dissolved oxygen (Skliris and Lascaratos, 2004), and, in turn, the primary productivity, biotic community structure and distribution, and the trophodynamics of estuarine systems (Grange and Allanson, 1995;Grange et al, 2000;Howden and Murtugudde, 2001;Kennish, 2002;Kimmel and Roman, 2004;Kimmerer, 2002). It is generally acknowledged that these kinds of changes have brought about detrimental outcomes, such as eutrophication, sediment deprivation, hypoxia, and contamination, as well as habitat loss and decreased bio-diversity, in many estuarine and coastal areas worldwide (Grange et al, 2000;Kennish, 3 2002; Rodriguez et al, 2001;Sklar and Browder, 1998;Wilber and Bass, 1998).…”

Section: Introductionmentioning

confidence: 99%

Response of coastal marine eco-environment to river fluxes into the sea: A case study of the Huanghe (Yellow) River mouth and adjacent waters

Fan

Huang

2008

Marine Environmental Research

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Section: Introductionmentioning

confidence: 99%

Response of coastal marine eco-environment to river fluxes into the sea: A case study of the Huanghe (Yellow) River mouth and adjacent waters

Fan

Huang

2008

Marine Environmental Research

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“…Amphipods are dominant in diverse habitats and play an important role in the food chain of marine ecosystems as the main food source for other predatory animals (Crawford 1937;Zhang 1974). Mysids are a ubiquitous component of zooplankton assemblages in a variety of aquatic environments and at times can comprise a significant proportion (up to 20%) of the total zooplankton biomass (Mauchline 1980;Price 1982;Webb et al 1987;Grange & Allanson 1995;Jerling & Wooldridge 1995;Froneman et al 2000). The occurrence of major crustacean items in the shrimp stomachs was not related to size, sex, or area.…”

Section: Discussionmentioning

confidence: 99%

Feeding ecology of the sand shrimpCrangon hakodateiRathbun, 1902 (Decapoda: Crangonidae) in the East Sea of Korea

Maher

Song

Park

et al. 2013

Animal Cells and Systems

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The feeding habits of the sand shrimp Crangon hakodatei in the East Sea (Korea) were investigated through analysis and comparison of the stomach contents of 602 individuals according to season, shrimp size class, and prey diversity. The diet of C. hakodatei consisted of 17 prey categories mainly comprising crustaceans, molluscs, polychaetes, nematodes, algae, and fishes, with crustaceans dominating the diet. Molluscs, nematodes, and fishes were also important prey, whilst other categories including polychaetes and algae comprised small percentages of the diet. For small C. hakodatei individuals (B10 mm carapace length [CL]), amphipods and mysids comprised more than 67% of the prey in both relative abundance and frequency of occurrence. Large individuals ( 10 mm CL) tended to be more dependent on amphipods than mysids. Amphipods and mysids together constituted the dominant prey, accounting for more than 50% of the diet in terms of both percent occurrence and relative abundance. The abundance and occurrence of prey showed a seasonal variation, with amphipods and mysids being the predominant prey in autumn (45%), winter (30%), and spring (40%). Amphipods were the dominant prey with regard to season, size class, sex, and area.

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“…Despite the permanently open nature of the Kariega Estuary, the system is currently highly impacted due to fresh water deprivation resulting from impoundments along the Kariega River [4,17]. The recorded normal [11,13,21].…”

Section: Discussionmentioning

confidence: 99%

“…The increase in the total chl-a concentration in freshwater dominated estuaries is largely thought to be result of elevated phytoplankton production rates resulting from increased macronutrient availability [1,3,17]. Alternatively, it is also possible that the elevated total chlorophyll-a concentrations recorded during the wet season may have be derived from riverine input or the resuspension of microphytobenthic algae [4,13,17].…”

Section: Discussionmentioning

confidence: 99%

“…The influence of the reduced freshwater inflow on the biology of southern African estuaries is now well documented [1,2]. Reduced freshwater inflow into estuaries has been linked to a decrease in the phytoplankton size composition and daily production rates largely because freshwater inflow represents the primary source of nutrients necessary to sustain the growth of the phytoplankton, particularly diatoms [1,3,4]. Among the heterotrophic components of the estuarine food web, the alteration in the riverine inflow into estuaries has been linked to changes in the recruitment, biomass and species composition and distribution of both inverstebrates and vertebrates within these systems [2,5,6].…”

Section: Introductionmentioning

confidence: 99%

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Response of the Plankton to a Fresh Water Pulse in a Fresh Water Deprived, Permanently Open South African Estuary

Froneman¹,

Vorwerk²

2013

JWARP

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This study assessed the influence of a freshwater pulse on selected physico-chemical and biological variables in a permanently open freshwater deprived southern African estuary. In the absence of the freshwater pulse a reverse gradient in salinity was evident with hypersaline (salinity > 40) conditions prevailing in the upper reaches of the estuary. Total chlorophyll-a (chl-a) concentration during this period ranged from 0.25 to 0.60 µg·l (SD ± 1203) and the biomass 21.8 mg·dwt·m −3 (SD ± 196). The total zooplankton abundance during the dry season was numerically dominated by the copepod nauplii and the calanoid copepod, Pseudodiaptomus hessei, which contributed up to 76% of the total zooplankton counts. The freshwater pulse was associated with the establishment of a horizontal gradient in salinity along the length of the estuary and a significant increase in the total chl-a concentration (range from 0.74 to 11.75 µg·l −1) and zooplankton biomass (range from 23.7 to 76.6 mg·dwt·m −3 ) (p < 0.05 in both cases). Additionally, there was a marked increase in the total zooplankton abundances and biomass within the estuary. A distinct shift in the zooplankton community composition was evident with the copepod, Acartia longipatella numerically dominating the zooplankton counts.

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The Influence of Freshwater Inflow on the Nature, Amount and Distribution of Seston in Estuaries of the Eastern Cape, South Africa

Cited by 63 publications

References 0 publications

Response of coastal marine eco-environment to river fluxes into the sea: A case study of the Huanghe (Yellow) River mouth and adjacent waters

Response of coastal marine eco-environment to river fluxes into the sea: A case study of the Huanghe (Yellow) River mouth and adjacent waters

Feeding ecology of the sand shrimpCrangon hakodateiRathbun, 1902 (Decapoda: Crangonidae) in the East Sea of Korea

Response of the Plankton to a Fresh Water Pulse in a Fresh Water Deprived, Permanently Open South African Estuary

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