Coastal marine habitats

Brown, A. C.; Jarman, N. G.

doi:10.1007/978-94-009-9951-0_38

Cited by 56 publications

(27 citation statements)

References 50 publications

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“…A more detailed analysis of the individual fish species reported as being harvested (Fig. 8) shows that the species composition changed around the coast, and the overall diversity of harvested species increased from west to east, in keeping with biogeographic patterns (Brown andJarman 1978, Turpie et al 2000). Diversity was especially low at Ebenhaeser, where respondents reported the harvesting of harders (mullet Liza richardsonii) only.…”

Section: Harvest Of Living Marine Resourcesmentioning

confidence: 72%

“…Instead, the sample localities were purposely chosen to cover the four (political) coastal provinces of South Africa, and to span the three biogeographic provinces (Brown andJarman 1978, Emanuel et al 1992). For most of the quantitative socio-economic analyses, the coast was zoned into the four regions shown in Figure 1: the West Coast (in which 15% of the fishing communities were sampled), South Coast (32%), East Coast (22%) and KwaZulu-Natal (KZN) Coast (31%).…”

Section: Sampling Localitiesmentioning

confidence: 99%

“…8). This is a direct reflection of biogeographic patterns (Brown andJarman 1978, Turpie et al 2000), but is also because of the accessibility of resources in particular localities. None of the resources were offshore species that require capital-intensive fishing.…”

Section: Use Of Marine Living Resourcesmentioning

confidence: 99%

See 2 more Smart Citations

Case studies on the socio-economic characteristics and lifestyles of subsistence and informal fishers in South Africa

Branch¹,

May²,

Roberts³

et al. 2002

South African Journal of Marine Science

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Section: Harvest Of Living Marine Resourcesmentioning

confidence: 72%

Section: Sampling Localitiesmentioning

confidence: 99%

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Case studies on the socio-economic characteristics and lifestyles of subsistence and informal fishers in South Africa

Branch¹,

May²,

Roberts³

et al. 2002

South African Journal of Marine Science

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“…Site IV (Maitlands) is located at the South-east Coast and is influenced by the south-eastwards flowing Agulhas current. At the Agulhas Bank it is deflected southwards (Brown and Jarman, 1978). The mean annual SST is 22°C (15-17°C in winter, 26°C in summer) (Ansell and McLachlan, 1980).…”

Section: Study Areas and Samplingmentioning

confidence: 98%

Genetic and morphological variation in four populations of the surf clam Donax serra (Röding) from southern African sandy beaches

Laudien

Flint²,

Bank³

et al. 2003

Biochemical Systematics and Ecology

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The surf clam Donax serra (Bivalvia, Donacidae) dominates sandy-beach communities of two southern African biogeographical regions, a cold (Benguela current) and warm province (Agulhas current). Morphometric and behavioural differences led to a controversial discussion of whether or not populations from the two provinces belong to the same species. Shell size measurements confirmed morphological differences: clams from the cold province were significantly rounder, flatter and less wedge-shaped than clams from the warm province. In this study a genetic approach was used to relate phenotypic differences to genetic variability of four populations of D. serra separated by up to 2500 km of shoreline. Genetic analysis of 22 protein-coding loci was carried out by starch-gel electrophoresis. Populations studied are conspecific (genetic distances range from 0.003 to 0.044) and possess genetic variation (alleles per locus: 1.73-1.91; mean heterozygosity: 18-22%; percentage polymorphism: 45.5-59.1%) in the range of most other marine bivalves, which allows for potential adaptation to environmental changes. Wright's fixation indices show little to moderate genetic divergence among the subpopulations relative to the limiting amount under complete fixation (F ST = 0.016-0.089), moderate divergence of individuals relative to the total population (F IS = 0.265-0.452), and comparably high divergence of individuals relative to the compound population (F IT = 0.300-0.473). The effective number of individuals exchanged between populations in each generation is high enough (1. 44-8.65) to counteract genetic drift. We propose that the observed differences represent phenotypic plasticity enabling this species to inhabit * Corresponding author.

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“…According to Brown and Jarman (1978) the South African coast spans three biogeographical regions (or climatic zones), namely the cool temperate west coast, warm temperate south coast and subtropical east coast (Figure 1). Rainfall patterns in the different regions vary greatly as a result of South Africa's highly variable climate.…”

Section: Study Areamentioning

confidence: 99%

Extension of a qualitative model on nutrient cycling and transformation to include microtidal estuaries on wave-dominated coasts: Southern hemisphere perspective

Taljaard

Niekerk

Joubert

2009

Estuarine, Coastal and Shelf Science

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Estuaries are dynamic transition zones acting as filters and transformers of nutrients passing from catchments to the sea. We propose an extension to an existing southern hemisphere model on nutrient dynamics in estuaries to include the relatively constricted, microtidal estuaries located along wave-dominated coasts in the region, specifically focusing on the limiting macronutrients nitrogen (N) and phosphorus (P) and on key processes, including physical (e.g. flushing, mixing and sedimentation), geochemical (e.g. flocculation), biochemical (e.g. remineralisation) and biological (e.g. primary production) processes. A simplified model of the physical states (primarily controlled by hydrological characteristics) is used as the basis for the qualitative model, where these are defined in terms of characteristic salinity-induced stratification of the water column, flushing time and the mouth condition.Four physical states are identified: a freshwater-dominated state, freshwater pulsed/recovery state, marine-dominated state and the closed mouth state. The states and their physical characteristics largely resemble that of the earlier model, except that the extended model reflects the dynamics of restricted inlets and introduces the closed mouth state. This model specifically explores the variation within southern African estuarine systems to better inform research and management programmes on the appropriate trophic, temporal and spatial scales at which uncertainties in ecosystem functioning need resolving. It can also be applied to other regions in the southern hemisphere, and even the northern hemisphere, with similar hydrological and estuarine geomorphological characteristics (e.g. the Mediterranean coast, the west coasts of North and South America, and the south-west and south-eastern coasts of Australia).

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Coastal marine habitats

Cited by 56 publications

References 50 publications

Case studies on the socio-economic characteristics and lifestyles of subsistence and informal fishers in South Africa

Case studies on the socio-economic characteristics and lifestyles of subsistence and informal fishers in South Africa

Genetic and morphological variation in four populations of the surf clam Donax serra (Röding) from southern African sandy beaches

Extension of a qualitative model on nutrient cycling and transformation to include microtidal estuaries on wave-dominated coasts: Southern hemisphere perspective

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