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Southern African Journal of Aquatic Sciences最新文献

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ALIEN FRESHWATER CRUSTACEAN AND INDIGENOUS MOLLUSC SPECIES WITH AQUACULTURE POTENTIAL IN EASTERN AND SOUTHERN AFRICA 非洲东部和南部具有水产养殖潜力的外来淡水甲壳类和本地软体动物物种
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1996.9631375
H. Mikkola
{"title":"ALIEN FRESHWATER CRUSTACEAN AND INDIGENOUS MOLLUSC SPECIES WITH AQUACULTURE POTENTIAL IN EASTERN AND SOUTHERN AFRICA","authors":"H. Mikkola","doi":"10.1080/10183469.1996.9631375","DOIUrl":"https://doi.org/10.1080/10183469.1996.9631375","url":null,"abstract":"Summary Farming of crustaceans and molluscs in Southern Africa is not well developed, but it is likely to intensify in coming years. The pressure to introduce new candidate species to satisfy specific culinary demands or improve bulk yields and efficiencies is also expected to increase. This paper stresses some of the problems associated with the intentional or accidental introduction of exotics, and translocation of local species into catchments where they did not previously occur. Several freshwater crustacean species have already been introduced into eastern and southern Africa, often without the knowledge and permission of the authorities. Introduced freshwater crayfish constitute a new element of African fauna, as such species were not present in the continent originally. Introduced species from North America and Australia could thus be seen as using some aspect of the resources which are under-utilized by existing species in Africa. This paper, however, argues that introduced species are likely to c...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"82 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":"122913266","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: 26
A REVIEW OF THE MACROBENTHIC FAUNA OF THE MHLATHUZE ESTUARY: SETTING THE ECOLOGICAL RESERVE 姆拉素泽河口大型底栖动物区系综述:生态保护区的设置
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1998.9631417
C. MacKay, D. Cyrus
{"title":"A REVIEW OF THE MACROBENTHIC FAUNA OF THE MHLATHUZE ESTUARY: SETTING THE ECOLOGICAL RESERVE","authors":"C. MacKay, D. Cyrus","doi":"10.1080/10183469.1998.9631417","DOIUrl":"https://doi.org/10.1080/10183469.1998.9631417","url":null,"abstract":"Summary This paper reviews historical and current ecological information on macrobenthos from the Mhlathuze Estuary before and after development of the Richards Bay Harbour. The fauna is described in terms of the potential influence of a change in freshwater inflow to the system and the requirements for the setting of an Ecological Reserve. Over 95% of the species recorded were primarily marine and to a lesser extent estuarine in origin. Fauna typical of sheltered, soft-bottomed marine environments inhabited the estuary, whereas estuarine fauna was limited to the canalised sections of the Mhlathuze River. Certain areas were characterised by opportunistic species indicative of disturbed or organically enriched sediments while others sustained a high diversity of more sensitive climax species, several of which are endemic to southern Africa. The majority of species belonged to the Class Polychaeta but the estuarine mudcrab Paratylodiplax blephariskios dominated the benthic biomass. The pre-feasibility stage...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"204 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":"123046568","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
A PRELIMINARY EVALUATION OF ASPECTS OF SASS (SOUTH AFRICAN SCORING SYSTEM) FOR THE RAPID BIOASSESSMENT OF WATER QUALITY IN RIVERS, WITH PARTICULAR REFERENCE TO THE INCORPORATION OF SASS IN A NATIONAL BIOMONITORING PROGRAMME 初步评价用于对河流水质进行快速生物评价的sass(南非评分系统)的各个方面，特别是关于将sass纳入国家生物监测方案
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1997.9631389
H. Dallas
{"title":"A PRELIMINARY EVALUATION OF ASPECTS OF SASS (SOUTH AFRICAN SCORING SYSTEM) FOR THE RAPID BIOASSESSMENT OF WATER QUALITY IN RIVERS, WITH PARTICULAR REFERENCE TO THE INCORPORATION OF SASS IN A NATIONAL BIOMONITORING PROGRAMME","authors":"H. Dallas","doi":"10.1080/10183469.1997.9631389","DOIUrl":"https://doi.org/10.1080/10183469.1997.9631389","url":null,"abstract":"Summary The rapid bioassessment method, SASS (South African Scoring System) has been developed to assess water quality in riverine ecosystems. It is a scoring system based on the presence or absence of macroinvertebrate groups, and yields three values, namely SASS4 Score, Number of Taxa and Average Score Per Taxon (ASPT). The current and future use of SASS, including incorporation into the National Biomonitoring Programme for Riverine Ecosystems, necessitates evaluation of this bioassessment method. This study focuses on three aspects. namely spatial variation in SASS scores, including regional and longitudinal (sub-regional) variation; temporal variation in SASS scores, and the effect of biotope availability on SASS scores.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"189 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":"123264005","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: 83
MASS MORTALITIES OF FISH IN SOUTH AFRICAN ESTUARIES 南非河口鱼类大量死亡
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1995.9631360
A. Whitfield
{"title":"MASS MORTALITIES OF FISH IN SOUTH AFRICAN ESTUARIES","authors":"A. Whitfield","doi":"10.1080/10183469.1995.9631360","DOIUrl":"https://doi.org/10.1080/10183469.1995.9631360","url":null,"abstract":"Summary Changes to the physico-chemical environment have been identified as the cause of fish mass mortalities in South African estuaries. Most published accounts have linked these mortalities to a single dominant factor such as low salinity, low or high temperature, low concentration of dissolved oxygen, and high sediment loads. A review of the evidence suggests that, although single factor induced mortalities do occur, the role of supplementary factors in triggering fish kills may be more important than previously acknowledged. The most frequently interacting factors in a southern African context appear to be salinity and water temperature, dissolved oxygen and water temperature, and suspensoids and dissolved oxygen. In some cases all the above factors may be operational in creating an environment which is unsuitable for the survival of certain estuarine-associated fish species.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"21 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":"130382767","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
COMMENTS ON THE WATER QUALITY OF THE MHLATHUZE ESTUARY IN RELATION TO DETERMINING THE ECOLOGICAL INTEGRITY CLASS 姆拉素泽河口水质与生态完整性等级评定的关系
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1998.9631415
V. Wepener, L. Vermeulen
{"title":"COMMENTS ON THE WATER QUALITY OF THE MHLATHUZE ESTUARY IN RELATION TO DETERMINING THE ECOLOGICAL INTEGRITY CLASS","authors":"V. Wepener, L. Vermeulen","doi":"10.1080/10183469.1998.9631415","DOIUrl":"https://doi.org/10.1080/10183469.1998.9631415","url":null,"abstract":"Summary Water quality forms an integral component of the determination of the Ecological Reserve of a water resource. This paper presents the available historical and current information on the water quality of the Mhlathuze estuary, The data were assessed in order to determine the forcing factors that characterise the water quality of Mhlathuze estuary. These factors were used in conjunction with a previously-developed water quality indexing system to assign a water quality integrity class to the Mhlathuze estuary. Three reaches of the estuary were classified as being largely natural with few modifications. Major issues relating to water quality data gaps were identified. By addressing these issues an integrity class could in future be assigned with greater confidence.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"6 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":"127738716","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: 7
THE EFFECTS OF PHYSICAL DISTURBANCE ON AFROPTILUM SUDAFRICANUM (EPHEMEROPTERA: BAETIDAE) POPULATION DENSITIES IN A KENYAN MOUNTAIN STREAM 物理干扰对肯尼亚山间溪流中非飞虫(蜉蝣目:巴伊科)种群密度的影响
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1998.9631408
J. Mathooko
{"title":"THE EFFECTS OF PHYSICAL DISTURBANCE ON AFROPTILUM SUDAFRICANUM (EPHEMEROPTERA: BAETIDAE) POPULATION DENSITIES IN A KENYAN MOUNTAIN STREAM","authors":"J. Mathooko","doi":"10.1080/10183469.1998.9631408","DOIUrl":"https://doi.org/10.1080/10183469.1998.9631408","url":null,"abstract":"Summary The effects of physical disturbance on larval populations of the mayfly Afroptilum sudafricanum Lestage were examined in the Naro Morn River, Kenya. Disturbance was induced by stirring, shifting and relocating streambed substrates by hand. The method aimed to simulate natural physical disturbance. The effects of continuous disturbance were examined by sampling larval populations at minute intervals of up to 14 minutes. The effects of periodic disturbance were examined by sampling larval populations which had been disturbed at intervals of minutes (short-term), hours (medium-term) and days (long-term). About 85% of A. sudafricanum individuals was removed from the streambed within four minutes of continuous physical disturbance. There were higher densities at night than during the day. All densities on the control sites for the medium-term disturbance experiments were significantly higher than those on the disturbed sites. Most of the post-disturbance densities on the medium-term disturbance sites w...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"15 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":"128825856","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
THE USE OF TOXICITY TESTING IN EFFLUENT REGULATION AND CONTROL: A NEW DIMENSION TO ASSESSMENT AND MANAGEMENT OF WATER QUALITY IN SOUTH AFRICA 在污水管制和控制中使用毒性试验:南非水质评估和管理的一个新层面
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1994.9631350
D. Roux
{"title":"THE USE OF TOXICITY TESTING IN EFFLUENT REGULATION AND CONTROL: A NEW DIMENSION TO ASSESSMENT AND MANAGEMENT OF WATER QUALITY IN SOUTH AFRICA","authors":"D. Roux","doi":"10.1080/10183469.1994.9631350","DOIUrl":"https://doi.org/10.1080/10183469.1994.9631350","url":null,"abstract":"Summary Efficient management tools are continually required to cope with increasing demands placed on the quality and quantity of aquatic resources. Recent developments in environmental monitoring indicate the importance of incorporating biological indicators in assessment programmes. Aquatic toxicology has consequently become an important monitoring and regulatory science. Applications of aquatic toxicity testing include: deriving water quality criteria; toxicological evaluations of whole effluents and receiving waters; and the estimation of ecological risk. Toxicity testing can potentially play a significant role in improving water quality in years to come, especially through its application in effluent regulation. Currently however, few environmental laboratories in South Africa have the required expertise and facilities to carry out a representative range of toxicity tests. Training and funding are required to build the capacity for the necessary developmental research, before toxicity testing can rou...","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":"126874872","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: 7
A COMMENT ON THE STATUS AND DISTRIBUTION OF THE GENUS PARATYLODIPLAX SERENE (BRACHYURA: OCYPODIDAE) IN SOUTHERN AFRICA 文章标题非洲南部副长尾蚤属(短肢目:长尾蚤科)的分布与现状
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1998.9631420
R. Owen
{"title":"A COMMENT ON THE STATUS AND DISTRIBUTION OF THE GENUS PARATYLODIPLAX SERENE (BRACHYURA: OCYPODIDAE) IN SOUTHERN AFRICA","authors":"R. Owen","doi":"10.1080/10183469.1998.9631420","DOIUrl":"https://doi.org/10.1080/10183469.1998.9631420","url":null,"abstract":"Summary The ocypodid genus Paratylodiplax was described in 1974 and contains four species, three of which are endemic to southern Africa where they form an important component of the estuarine benthic fauna. However, very little is known about the biology and ecology of the genus, with discrepancies existing between the commonly quoted distributions and actual records of the species. This comment outlines the current taxonomic status of the genus and attempts to resolve the discrepancies in the distributions of the southern African species Paratylodiplax blephariskios has been recorded from the Morrumbene estuary in Mozambique to the Mngazana estuary in the eastern Cape, while the distributions of P. algoensis and P. edwardsii are given as being from the Mngazana to the Eerste estuary and Langebaan Lagoon in the western Cape respectively.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"82 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":"125901742","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: 2
THE STATE OF KNOWLEDGE OF WATER QUALITY AND MAJOR BIOTIC COMPONENTS OF THE MHLATHUZE ESTUARY 姆拉素泽河口水质及主要生物成分的认识现状
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1998.9631414
D. Cyrus
{"title":"THE STATE OF KNOWLEDGE OF WATER QUALITY AND MAJOR BIOTIC COMPONENTS OF THE MHLATHUZE ESTUARY","authors":"D. Cyrus","doi":"10.1080/10183469.1998.9631414","DOIUrl":"https://doi.org/10.1080/10183469.1998.9631414","url":null,"abstract":"Summary This note briefly introduces the concept of the Environmental Reserve of the New Water Act as well as the set of papers hereafter which deal with specific components of the ecology of the Mhlathuze Estuary. These were prepared for an Estuarine Flow Requirements study of the system. Each forms an up-to-date review of the specific topic it deals with.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"19 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":"115030190","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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