scholarly journals Homing and movement patterns of a South African limpet Scutellastra argenvillei in an area invaded by an alien mussel Mytilus galloprovincialis

2002 ◽  
Vol 243 ◽  
pp. 111-122 ◽  
Author(s):  
C Ruiz Sebastián ◽  
CN Steffani ◽  
GM Branch
Keyword(s):  
South African ◽  
Mytilus Galloprovincialis ◽  
Movement Patterns

Indian Ocean humpback dolphin (Sousa plumbea ) movement patterns along the South African coast

2017 ◽  
Vol 28 (1) ◽  
pp. 231-240 ◽  
Author(s):  
Els Vermeulen ◽  
Thibaut Bouveroux ◽  
Stephanie Plön ◽  
Shanan Atkins ◽  
Wilfred Chivell ◽  
...  
Keyword(s):  
Indian Ocean ◽  
South African ◽  
Movement Patterns ◽  
The South ◽  
African Coast

scholarly journals Trace Elements in Mediterranean Mussels Mytilus galloprovincialis from the South African West Coast

2015 ◽  
Vol 22 (4) ◽  
pp. 489-498 ◽  
Author(s):  
Jacques Bezuidenhout ◽  
Nicole Dames ◽  
Alfred Botha ◽  
Marina V. Frontasyeva ◽  
Zoya I. Goryainova ◽  
...  
Keyword(s):  
Trace Elements ◽  
South African ◽  
Mytilus Galloprovincialis ◽  
Soft Tissues ◽  
Analytical Techniques ◽  
Major And Trace Elements ◽  
Inorganic Contaminants ◽  
Bivalve Molluscs ◽  
Icp Ms

Abstract Invasive bivalve molluscs, Mediterranean mussels (Mytilus galloprovincialis) were used as sentinel biomonitors of pollution by inorganic contaminants in Saldanha Bay and the Langebaan Lagoon area of South Africa. Two complementary analytical techniques, ICP-MS and NAA, allowed for determination of concentrations of 31 major and trace elements including heavy metals and arsenic in the soft tissues of the mussels. Distinct seasonal patterns were found in the dynamics of these concentrations, with the mussels accumulating much more trace elements in winter than in the summer. In general, the mussels that grew naturally also demonstrated higher concentrations of As, Cd, Fe, Hg and Zn than those that were farmed. Fe showed the highest levels with a maximum concentration of 444 mg/kg followed by Zn with a maximum of 228 mg/kg. The concentrations of Mn and Pb were significantly higher in the Port of Saldanha close to the jetty where ores containing these metals are loaded in comparison with the other sampling sites. It was concluded that bivalve molluscs present themselves as effective biomonitors when assessing marine aquatic pollution by inorganic contaminants in the Saldanha Bay region.

Nursery grounds, movement patterns and growth rates of dusky sharks, Carcharhinus obscurus: a long-term tag and release study in South African waters

2009 ◽  
Vol 60 (6) ◽  
pp. 571 ◽  
Author(s):  
Nigel E. Hussey ◽  
Ian D. McCarthy ◽  
Sheldon F. J. Dudley ◽  
Bruce Q. Mann
Keyword(s):  
South African ◽  
Growth Rates ◽  
Movement Patterns ◽  
Small Scale ◽  
Shark Species ◽  
Early Life Stages ◽  
Kwazulu Natal ◽  
Management Plans ◽  
Carcharhinus Obscurus

Knowledge of movement patterns of sharks in coastal waters is critical for the structuring of regional management plans. Through a long-term tag–recapture program, 9716 dusky sharks (Carcharhinus obscurus) were tagged and released along the east coast of South Africa. A total of 648 C. obscurus, principally small sharks (<100 cm PCL), were recaptured. Most recaptures were within 100 km of the tagging location in the nursery habitat in KwaZulu-Natal (KZN) with small scale movements occurring throughout the year. Forty-eight C. obscurus undertook movements >200 km that indicated a southerly migration between KZN and Eastern/Southern Cape (E/SC) between June and November. Seasonal northerly migrations were less well defined. The largest southerly and northerly movements were 1323 km and 1374 km, respectively. For sharks moving 1–100 km south from their tagging locality in KZN, an increase in displacement occurred between June and September identifying animals beginning their migration to the E/SC. With increasing displacement, there was also an increase in minimum swimming speed. Calculated growth rates of small sharks of 10.3–11.5 cm year–1 were in agreement with current literature values. Established tag–recapture programs provide an important tool in understanding the ecology of early life-stages of coastal shark species.

Impact of mussel (Mytilus galloprovincialis) raft-culture on benthic macrofauna, in situ oxygen uptake, and nutrient fluxes in Saldanha Bay, South Africa

2001 ◽  
Vol 58 (5) ◽  
pp. 1021-1031 ◽  
Author(s):  
Jeanie Stenton-Dozey ◽  
Trevor Probyn ◽  
Alistair Busby
Keyword(s):  
South African ◽  
Mytilus Galloprovincialis ◽  
N:P Ratio ◽  
Nutrient Fluxes ◽  
Reference Sites ◽  
Raft Culture ◽  
Organic Debris ◽  
Uptake Rates ◽  
Mussel Culture

Culture of the mussel Mytilus galloprovincialis in a South African bay created organic enrichment and anoxia in sediments. Particulate organic matter (POM) was high under rafts versus the references, especially in the first 10 cm (C = 7.5 versus 0.4%, N = 0.7 versus 0.08%). Total reducible sulphides (TRS) increased threefold downcore (from 0.04 to 0.12%). High C:N ratios (12–15) indicated accumulation of refractory POM, derived mainly from faeces and decaying mussels and foulers. Although O2 uptake by raft sediments was the lowest, rates could not conclusively be separated from the references. Ammonium dominated N efflux, the highest and most variable rates being under mussels (825 ± 500 µmol NH4·m–2·h–1). Phosphate efflux (25–140 µmol·m–2·h–1) could not be ascribed to culture biodeposition, but there was an inconclusive trend for the molar N:P ratio to be highest in these sediments. Macrofauna biomass was reduced and trophic groups and taxa altered. Under rafts, macrofauna and organic debris were linked to O2 uptake rates, whereas at the reference sites, macrofauna appeared to be the major O2 consumer. It was concluded that POM and TRS in sediment as well as macrofauna biomass, and potentially molar N:P ratios, were more sensitive indicators of benthic impact from mussel culture than O2 uptake rates or nutrient fluxes.

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