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Southern African Journal of Aquatic Sciences最新文献

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FURTHER COMMENT ON THE RESPONSE OF EASTERN CAPE PROVINCE ESTUARIES TO VARIABLE FRESHWATER INFLOWS 进一步评论东开普省河口对可变淡水流入的反应
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1995.9631362
B. Allanson, G. Read
{"title":"FURTHER COMMENT ON THE RESPONSE OF EASTERN CAPE PROVINCE ESTUARIES TO VARIABLE FRESHWATER INFLOWS","authors":"B. Allanson, G. Read","doi":"10.1080/10183469.1995.9631362","DOIUrl":"https://doi.org/10.1080/10183469.1995.9631362","url":null,"abstract":"Summary River flow patterns in the Kariega, Great Fish and Keiskamma estuaries, South Africa are examined to assess the impact variation in flow has upon the delivery of inorganic nutrients, total organic carbon, primary productivity and the heterotrophic components, bacteria and zooplankton. Switching from a suspensoid—microalgal based energy source to an autochthonous detritus base is reviewed in the context of these effects.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125607114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 84
A PRELIMINARY BIOCHEMICAL GENETIC STIJDY OF TWO POPULATIONS OF LITHOGNATHUS AURETI (PERCIFORMES: SPARIDAE) 两居群的初步生化遗传分析(表演目:裂毛螨科)
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1998.9631411
F. H. Bank, J. Holtzhausen
{"title":"A PRELIMINARY BIOCHEMICAL GENETIC STIJDY OF TWO POPULATIONS OF LITHOGNATHUS AURETI (PERCIFORMES: SPARIDAE)","authors":"F. H. Bank, J. Holtzhausen","doi":"10.1080/10183469.1998.9631411","DOIUrl":"https://doi.org/10.1080/10183469.1998.9631411","url":null,"abstract":"Summary Two populations of Lithognathus aureti were electrophoretically analysed to determine the extent of genetic divergence between, and variation within them. Gene products of 35 protein coding loci showed no fixed allele differences between these populations. However, significant genotypic differentiation between the populations was found at two loci, which indicates that effective barriers exist to isolate them. This is substantiated by catch-and-release data. The limited gene flow between the populations from Meob Bay and Rocky Point, and the enviromnental barrier in the vicinity of Meob Bay, indicate that they are effectively isolated. This is the first account of the genetic variation of these populations, and the results are important for the effective management of these recreationally and commercially exploited, fishes.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"154 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133980290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
TOWARDS THE SUSTAINABLE WATER QUALITY MANAGEMENT OF AN URBANISED AFRICAN RIVER CATCHMENT: THE KLIP RIVER, GAUTENG, SOUTH AFRICA 迈向可持续水质管理的城市化非洲河流集水区:klip河，豪登省，南非
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1997.9631401
M. Freeman, H. Wiechers, L. Lötter, Mike Howard
{"title":"TOWARDS THE SUSTAINABLE WATER QUALITY MANAGEMENT OF AN URBANISED AFRICAN RIVER CATCHMENT: THE KLIP RIVER, GAUTENG, SOUTH AFRICA","authors":"M. Freeman, H. Wiechers, L. Lötter, Mike Howard","doi":"10.1080/10183469.1997.9631401","DOIUrl":"https://doi.org/10.1080/10183469.1997.9631401","url":null,"abstract":"Summary A water quality impact assessment of Greater Johannesburg's three southern wastewater treatment works was undertaken to quantify present and predict future contributions of pollution to the Klip River, as well as the impact on downstream users. This information is required to assist the Department of Water Affairs and Forestry in setting appropriate standards for the treated effluent discharged from these works. and for the integrated water quality management of the entire Klip River system. The study showed that the wetlands in the Klip River system have a distinct and important role to play in the abatement of diffuse pollution. A contradictory view is held. however, by many local communities. Their feeling is that the wetlands are unsafe areas and aesthetically unacceptable due to their propensity to act as waste traps.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129155432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
SOME OBSERVATIONS ON THE FISH LIFE IN A SEASONAL SAND RIVER 季节性沙河中鱼类生活的一些观察
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1997.9631390
B. V. D. Waal
{"title":"SOME OBSERVATIONS ON THE FISH LIFE IN A SEASONAL SAND RIVER","authors":"B. V. D. Waal","doi":"10.1080/10183469.1997.9631390","DOIUrl":"https://doi.org/10.1080/10183469.1997.9631390","url":null,"abstract":"Summary Five fish species were collected in a seasonal sand river that had migrated upstream more than 150 km from the permanent Limpopo River. The population structure indicated that mainly juveniles had taken part in this colonisation. No fish were collected in the winter when the river was dry. Information was obtained of fish surviving underground in the dry river bed.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116011055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
A LIMNOLOGICAL PROFILE OF THE UPPER OKAVANGO DELTA AT LOW WATER LEVEL 低水位时上奥卡万戈三角洲的湖泊剖面
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1997.9631398
R. C. Hart
{"title":"A LIMNOLOGICAL PROFILE OF THE UPPER OKAVANGO DELTA AT LOW WATER LEVEL","authors":"R. C. Hart","doi":"10.1080/10183469.1997.9631398","DOIUrl":"https://doi.org/10.1080/10183469.1997.9631398","url":null,"abstract":"Summary Selected limnological attributes of the Okavango Delta panhandle were measured during a brief summer survey of “open-water” habitats extending from the permanent mainstream channel, through contiguous off-channel lagoons and still backwaters, to seasonally isolated floodplain lagoon and temporary pool biotopes on the left-bank of the Okavango River at Seronga. Wide ranges in most determinants were evident along this profile:- temperature (27–34°C); conductivity(4–12.7mS m−1); pH(5.7–9.2); transparency(0.2–>2.5 m Secchi depth); dissolved oxygen (20–220% saturation); PO4-P (61–110 μg l−1): SiO2—Si (6.9–14.0 mg l−1): NH4-N (30–44 μg l−1): chlorophyll (1.3–183 μ.g l−1). Zooplankton was variably diverse (species richness from ≥ 3 to 20), comprising both euplanktonic (Bosmina, Ceriodaphnia, Daphnia, Diaphanosoma, Moina, Mesocyclops, Thermocyclops, Tropodiaptomus) and more typical epiphytic crustacean taxa (Alona, Macrothrix, Pleuroxus), along with various rotifers (Brachionus, Hexarthra, Keratella, Tric...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122116850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
DETRIMENTAL EFFECTS OF FENTHION (QUELETOX® UL), USED TO CONTROL RED-BILLED QUELEA (QUELEA QUELEA), ON RHEOPHILIC BENTHIC MACROINVERTEBRATES IN THE ORANGE RIVER 用于控制红嘴魁利亚(魁利亚魁利亚)的倍硫磷(queletox®ul)对橙河中嗜流底栖大型无脊椎动物的有害影响
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1994.9631348
R. Palmer
{"title":"DETRIMENTAL EFFECTS OF FENTHION (QUELETOX® UL), USED TO CONTROL RED-BILLED QUELEA (QUELEA QUELEA), ON RHEOPHILIC BENTHIC MACROINVERTEBRATES IN THE ORANGE RIVER","authors":"R. Palmer","doi":"10.1080/10183469.1994.9631348","DOIUrl":"https://doi.org/10.1080/10183469.1994.9631348","url":null,"abstract":"Summary The relative abundance of rheophilic macroinvertebrates in the Orange River was assessed before and 15 hrs after two aerial applications of fenthion (QUELETOX® UL) above roosting sites of the red-billed quelea (Quelea quelea). The first treatment had no detectable effect on benthic macroinvertebrate abundance, whereas the second treatment caused mortality among at least 17 taxa (over half the taxa present). The most sensitive species were nymphs of the mayflies Baetis glaucus and Tricorythus discolor, followed by larvae of the midge Rheotanytarsus fuscus. Fenthion had no detrimental effect on the population densities of the mayfly Afroptilum excisum. The results of this study warn of the dangers of fenthion in water supplies. It is suggested that alternative methods of quelea control along the Orange River should be sought.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132761503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
THE EFFECT OF SEASON ON A BIOTIC WATER QUALITY INDEX: A CASE STUDY OF THE YELLOW JACKET AND MAZOWE RIVERS, ZIMBABWE. 季节对生物水质指数的影响:以津巴布韦黄夹克河和马祖韦河为例。
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1998.9631409
B. Gratwicke
{"title":"THE EFFECT OF SEASON ON A BIOTIC WATER QUALITY INDEX: A CASE STUDY OF THE YELLOW JACKET AND MAZOWE RIVERS, ZIMBABWE.","authors":"B. Gratwicke","doi":"10.1080/10183469.1998.9631409","DOIUrl":"https://doi.org/10.1080/10183469.1998.9631409","url":null,"abstract":"Summary The effect of season on the South African Scoring System (SASS) biotic index for rapid assessment of water quality using benthic macroinvertebrates was investigated using the Yellow Jacket and Mazowe Rivers in Zimbabwe as a case study. Several impacts in the area degraded water quality. These were habitat destruction, acid mine drainage and organic pollution. SASS score at all sites changed with season. At and downstream from polluted sites, water quality determined using SASS was best at the end of the rainy season and it deteriorated steadily into the dry season. SASS scores from sites upstream of pollution appeared to improve towards the end of the rainy season. Average Score Per Taxon indices did not have a significant pattern of seasonal variation. SASS was designed to monitor water quality in South African rivers, so when implementing any monitoring programme, selection of sampling season and the interpretation of results in areas with similar climate patterns should take seasonal effects in...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121834101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 29
FUNDUDZI, A UNIQUE, SACRED AND UNKNOWN SOUTH AFRICAN LAKE Fundudzi，一个独特的、神圣的、不为人知的南非湖泊
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1997.9631387
B. V. D. Waal
{"title":"FUNDUDZI, A UNIQUE, SACRED AND UNKNOWN SOUTH AFRICAN LAKE","authors":"B. V. D. Waal","doi":"10.1080/10183469.1997.9631387","DOIUrl":"https://doi.org/10.1080/10183469.1997.9631387","url":null,"abstract":"Summary Lake Fundudzi is a unique, small inland lake in the north eastern region of South Africa, formed by a landslide. The considerable sedimentation of its basin indicates an age in the order of 10 000s of years. It forms the focus of a rich heritage of ceremonial rituals and myths amongst the local Vhavenda population, but has not enjoyed the protection it deserves and serious impacts have been made by human transformation of the catchment, over-utilization of natural resources, forestry, water abstraction and degradation of the rivers. Additionally, the present fish community is not natural as all larger fish species seem to have been introduced. Some limnological information on this lake has been sporadically collected over a period of 60 years. It indicates conductivities ranging between 2,8 −18,8 μ S m−1 neutral to acid waters and oxygen stratification near the bottom during winter. Zooplankton was characterised by small copepods and rotifers. The lake is presently threatened by an increased anthr...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129182958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 21
VARIABILITY IN THE INVERTEBRATE FAUNA OF AN INTERMITTENT STREAM OVER THREE CONSECUTIVE MIDSUMMER PERIODS 连续三个仲夏期间间歇溪流无脊椎动物群的变化
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1997.9631400
M. C. Uys, J. O’Keeffe
{"title":"VARIABILITY IN THE INVERTEBRATE FAUNA OF AN INTERMITTENT STREAM OVER THREE CONSECUTIVE MIDSUMMER PERIODS","authors":"M. C. Uys, J. O’Keeffe","doi":"10.1080/10183469.1997.9631400","DOIUrl":"https://doi.org/10.1080/10183469.1997.9631400","url":null,"abstract":"Summary Non-perennial rivers in semi-arid regions are exposed to unpredictable and highly variable rainfall and hydrology which can have considerable effects on faunal organisation at different scales. Spatial and temporal dynamics in the aquatic invertebrate fauna of an aseasonal intermittent river in the Eastern Cape, South Africa, were studied over three consecutive midsummer periods. Taxonomic composition varied widely from month to month and between years. Faunal abundances were generally low, and spatial distribution was highly heterogenous. Most of the abiotic variables measured remained within a narrow range over the study period, and only current speed in individual biotopes could be linked to biotic organisation. Faunal similarities were greatest between samples collected during similar hydrological conditions (rather than during similar times of the year). These findings suggest that rainfall and hydrology are major determinants of biotic organisation in this section of the river. The erratic n...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126489571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
THE EFFECT OF SUBLETHAL CONCENTRATIONS OF NATURAL SUSPENDED SILT ON ROUTINE OXYGEN CONSUMPTION BY MOZAMBIQUE TILAPIA (OREOCHROMIS MOSSAMBICUS) 亚致死浓度天然悬浮泥沙对莫三比克罗非鱼日常耗氧量的影响
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1996.9631374
H. H. Preez, L. Smit, G. Steyn, Y. Buermann
{"title":"THE EFFECT OF SUBLETHAL CONCENTRATIONS OF NATURAL SUSPENDED SILT ON ROUTINE OXYGEN CONSUMPTION BY MOZAMBIQUE TILAPIA (OREOCHROMIS MOSSAMBICUS)","authors":"H. H. Preez, L. Smit, G. Steyn, Y. Buermann","doi":"10.1080/10183469.1996.9631374","DOIUrl":"https://doi.org/10.1080/10183469.1996.9631374","url":null,"abstract":"Summary Exposure of adult Oreochromismossambicusto sublethal concentrations (5 to 20 g silt l−1) of natural silt from the Phalaborwa Barrage altered routine oxygen consumption by causing increased rates of oxygen consumption. This indicates that sublethal levels of suspended silt result in a significant (p<0.05) increase in oxygen consumption by the exposed fish due to an increase in metabolic rate associated with increased activity and stress. Any species unable to compensate for this increase in energy expenditure over time would not be able to sustain itself.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131889313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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