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Southern African Journal of Aquatic Sciences最新文献

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RANGE EXTENSIONS FOR GALAXIAS ZEBRATUS CASTELNAU, 1861 (GALAXIIDAE), KROM AND GAMTOOS RIVER SYSTEMS, EASTERN CAPE. 斑马鱼的范围扩展，1861年(星系科)，krom和gamtoos河系统，东开普省。
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1995.9631366
J. Cambray, A. Bok, R. Smith
{"title":"RANGE EXTENSIONS FOR GALAXIAS ZEBRATUS CASTELNAU, 1861 (GALAXIIDAE), KROM AND GAMTOOS RIVER SYSTEMS, EASTERN CAPE.","authors":"J. Cambray, A. Bok, R. Smith","doi":"10.1080/10183469.1995.9631366","DOIUrl":"https://doi.org/10.1080/10183469.1995.9631366","url":null,"abstract":"Summary The distribution of the members of the Southern Hemisphere family Galaxiidae has intrigued biogeographers for some time. They are present in South America, Africa, Australia and New Zealand. There is only one species in Africa, the Cape galaxias (Galaxiaszebratus). Galaxias zebratus had previously been recorded from the Keurbooms River in the eastern Cape to the Olifants River in the western Cape. Recently specimens were collected from the source of the Krom River system and the upper Gamtoos River system, which extends the known distribution of this freshwater fish species eastwards. Alien fish, dams and water abstraction threaten what remains of these important populations of Cape galaxias.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"143 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":"122064294","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: 8
A LIMNOLOGICAL SYNOPSIS OF BHANGAZI SOUTH, A DYSTROPHIC COASTAL LAKE IN THE GREATER ST LUCIA WETLAND PARK (KWAZULU/NATAL), WITH COMMENTS ON ITS CONSERVATION VALUE. 大圣卢西亚湿地公园(夸祖鲁/纳塔尔)的一个营养不良的海岸湖泊——邦加兹南湖泊的湖沼学概况，并对其保护价值进行了评论。
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1997.9631399
R. C. Hart, C. Appleton
{"title":"A LIMNOLOGICAL SYNOPSIS OF BHANGAZI SOUTH, A DYSTROPHIC COASTAL LAKE IN THE GREATER ST LUCIA WETLAND PARK (KWAZULU/NATAL), WITH COMMENTS ON ITS CONSERVATION VALUE.","authors":"R. C. Hart, C. Appleton","doi":"10.1080/10183469.1997.9631399","DOIUrl":"https://doi.org/10.1080/10183469.1997.9631399","url":null,"abstract":"Summary Base-line limnological and biological data are given for Lake Bhangazi South, a small lake on the coastal plain of Kwazulu-Natal, South Africa. This shallow (Zmax < 6 m), subtropical lake is a warm and seemingly continuously polymictic system, but experiences severe (continuous?) deoxygenation of its deeper muddy sediments. Nutrient status (of N in particular), light attenuation, phytoplankton productivity and zooplankton biomass are high relative to other regionally comparable coastal lakes investigated. While the ichthyofauna is quite rich, zooplankton and especially zoobenthos communities are species-poor, and lack the relict estuarine components which often dominate these latter assemblages in comparable coastal lakes. The zooplankton is typically freshwater in composition, and contains a new species of copepod (Tropodiaptomus bhangazii Rayner); the lake may be older, or seen longer evolutionary divergence than its proximate counterparts. Benthic species diversity in the lake is especially low...","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":"122066212","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: 11
A PRELIMINARY INVESTIGATION OF THE REPRODUCTIVE BEHAVIOUR OF THE KNYSNA SEAHORSE, HIPPOCAMPUS CAPENSIS BOULENGER, 1900 海马体繁殖行为的初步调查，hippocampus capensis boulenger, 1900
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1995.9631367
N. Grange, R. Cretchley
{"title":"A PRELIMINARY INVESTIGATION OF THE REPRODUCTIVE BEHAVIOUR OF THE KNYSNA SEAHORSE, HIPPOCAMPUS CAPENSIS BOULENGER, 1900","authors":"N. Grange, R. Cretchley","doi":"10.1080/10183469.1995.9631367","DOIUrl":"https://doi.org/10.1080/10183469.1995.9631367","url":null,"abstract":"","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"2 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":"128810865","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
The Evolution of Thermohaline Structure in a Closed Estuary 封闭河口温盐构造演化
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1990.10557367
J. Slinger, J. Largier
{"title":"The Evolution of Thermohaline Structure in a Closed Estuary","authors":"J. Slinger, J. Largier","doi":"10.1080/10183469.1990.10557367","DOIUrl":"https://doi.org/10.1080/10183469.1990.10557367","url":null,"abstract":"Summary Following the closure of the mouth of the Palmiet estuary in February 1988, the thermohaline structure was recorded at approximate weekly intervals. The evolution of the two-layer structure was studied and the mixing processes causing the changes were determined. Vertical diffusivities were computed and the qualitative understanding of the slow mixing rates in the deep pools was confirmed. The study indicates a probable summer condition of the estuary following upstream impoundment.","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"17 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":"124133241","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: 13
COASTAL AQUATIC ECOSYSTEMS, CONSERVATION AND MANAGEMENT STRATEGIES IN NIGERIA 尼日利亚沿海水生生态系统、养护和管理战略
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1994.9631346
E. Ajao
{"title":"COASTAL AQUATIC ECOSYSTEMS, CONSERVATION AND MANAGEMENT STRATEGIES IN NIGERIA","authors":"E. Ajao","doi":"10.1080/10183469.1994.9631346","DOIUrl":"https://doi.org/10.1080/10183469.1994.9631346","url":null,"abstract":"Summary The coastal ecosystems in Nigeria are classified into four broad regions according to differences in general morphology, vegetation and beach type. They are the barrier lagoon complex, the transgressive mud beach, the Niger delta and the strand coast. The delta has provided the best conditions for the growth of vegetation and provides habitat for the widest variety of trees and plants. There are no significant protected coastal wetlands in Nigeria. The greatest opportunities for in situ conservation of unique and threatened species abound in the delta area. Mangroves and fishes are the major renewable resources which have been managed using various conservation actions including legislation, regulation and mandatory environmental impact assessment. Captive breeding and culture are practised for over-exploited and endangered fish species. Some problems mitigating against the conservation of aquatic resources are associated with coastal urbanization, oil and gas exploration and exploitation, industr...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"80 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":"126360099","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
THE IMPORTANCE OF VOUCHER SPECIMENS 凭证标本的重要性
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1996.9631380
F. D. Moor
{"title":"THE IMPORTANCE OF VOUCHER SPECIMENS","authors":"F. D. Moor","doi":"10.1080/10183469.1996.9631380","DOIUrl":"https://doi.org/10.1080/10183469.1996.9631380","url":null,"abstract":"","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"819 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":"124279490","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
INVERTEBRATES IN THE ORANGE RIVER, WITH EMPHASIS ON CONSERVATION AND MANAGEMENT 橙河的无脊椎动物，重点是保护和管理
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1996.9631371
R. Palmer
{"title":"INVERTEBRATES IN THE ORANGE RIVER, WITH EMPHASIS ON CONSERVATION AND MANAGEMENT","authors":"R. Palmer","doi":"10.1080/10183469.1996.9631371","DOIUrl":"https://doi.org/10.1080/10183469.1996.9631371","url":null,"abstract":"Summary Distribution and abundance of aquatic invertebrates in the lower 1800 kilometres of the Orange River is examined in relation to the conservation and management of the Orange River. Data are based on published information and surveys conducted during research into blackfly control, conducted between 1991 and 1996. The river is characterised by low numbers of species, reflecting the historically seasonal nature of the river. The fauna is dominated by filter-feeders, highlighting the importance of fine particulate material (bacteria, phytoplankton and detritus) in the ecology of the river. No taxa are considered endemic, although the present day distribution of the blackfly S. gariepense is almost certainly restricted to the Orange River. At least three species have probably disappeared from the Orange River in recent years, one is endangered, one is a serious pest, at least fourteen are potential disease vectors, and two are considered invasive. New records for South Africa include five species of C...","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":"116134752","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: 17
A COMPARISON OF THE FOOD SOURCES OF STONEFLIES (PLECOPTERA) FROM AN OPEN-AND A CLOSED-CANOPY HEADWATER STREAM IN SOUTH AFRICA USING STABLE-ISOTOPE TECHNIQUES 使用稳定同位素技术比较南非开放和封闭冠层水源中石蝇(翅翅目)的食物来源
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1997.9631384
E. Reynolds, C. D. Villiers, B. R. Davies
{"title":"A COMPARISON OF THE FOOD SOURCES OF STONEFLIES (PLECOPTERA) FROM AN OPEN-AND A CLOSED-CANOPY HEADWATER STREAM IN SOUTH AFRICA USING STABLE-ISOTOPE TECHNIQUES","authors":"E. Reynolds, C. D. Villiers, B. R. Davies","doi":"10.1080/10183469.1997.9631384","DOIUrl":"https://doi.org/10.1080/10183469.1997.9631384","url":null,"abstract":"Summary The effects of different local food resources on the diets of some filipalpian stonefly nymphs (Aphanicerca spp.) were investigated. Animals from two headwater reaches, one primarily allochthonously driven and the other an open-canopied autochthonous-based system were compared. However, gut and stable carbon isotope analyses revealed no real differences in plecopteran diets between the systems, with leaf detritus being a major source of carbon, and algae contributing virtually nothing to their diets. δ15N analysis suggested that the animals obtained their nitrogen from sources other than leaf material itself, and it was hypothesized that this source was the microbial slime layer formed on decomposing leaves. It was concluded that the feeding behaviour of Plecoptera is consistent with that of shredders of leaf detritus, and as such they uphold River Continuum Concept predictions of large shredder populations being indicative of a predominance of coarse particles in headwater reaches. This study als...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"25 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":"123576483","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
FRESHWATER FISH OF THE ADDO ELEPHANT NATIONAL PARK 阿多大象国家公园的淡水鱼
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1998.9631412
I. Russell
{"title":"FRESHWATER FISH OF THE ADDO ELEPHANT NATIONAL PARK","authors":"I. Russell","doi":"10.1080/10183469.1998.9631412","DOIUrl":"https://doi.org/10.1080/10183469.1998.9631412","url":null,"abstract":"Summary This study aimed to determine the distribution and relative abundance of freshwater fish in the Addo Elephant National Park. A total of 1578 fish specimens of 12 species were collected during surveys carried out in the Sundays River and four tributaries during 1996 and 1997. The redfin minnow Pseudobarbus afer comprised 81.6% of the total catch. Length frequency analysis of P. afer populations indicated recent successful recruitment in several rivers. Differences between rivers in the concentrations of dissolved and suspended solids and pH are possible reasons for different species complements. These surveys show the distribution of P. afer and Barbus aeneus in the Eastern Cape Province to be wider than previously reported. Management action is required to minimise opportunities for further establishment and spread of alien and translocated fish species and to conserve indigenous fish assemblages within the Park.","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":"122127021","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
GENETIC VARIATION IN TWO POPULATIONS OF THE ORANGE ROUGHY (HOPLOSTETHUS ATLANTIC US) FROM NAMIBIA 来自纳米比亚的两个橙色粗蜥种群的遗传变异
Southern African Journal of Aquatic Sciences Pub Date : 1900-01-01 DOI: 10.1080/10183469.1998.9631413
N. Flint, F. H. Bank, P. Theron, Arved Staby
{"title":"GENETIC VARIATION IN TWO POPULATIONS OF THE ORANGE ROUGHY (HOPLOSTETHUS ATLANTIC US) FROM NAMIBIA","authors":"N. Flint, F. H. Bank, P. Theron, Arved Staby","doi":"10.1080/10183469.1998.9631413","DOIUrl":"https://doi.org/10.1080/10183469.1998.9631413","url":null,"abstract":"Summary The orange roughy (Hoplostethus atlanticus) is a relatively new commercially exploited fish species, but it is currently ranked third amongst the world's top five seafood products. Gene products of 22 protein coding loci in two populations off the coast of Namibia were studied by horizontal starch gel electrophoresis. Values of 31.8% and 40.9% (0.95 criterion), and 0.137 (± 0.0.47) to 0.143 (± 0.042) were obtained for the percentage of polymorphic loci and the average heterozygosity of the two populations respectively. The unbiased genetic distance was 0.004 between the populations and the average fixation index (FST) value was 0.019. These values are comparable with results obtained in a similar study of orange roughy near New Zealand, where the percentage of polymorphic loci ranged from 22.7% to 38.1% (0.95 criterion) and heterozygosity values ranged from 0.104 (±0.037) to 0.125 (±O.044). The genetic differentiation observed between the populations suggests that it would be inadvisable to use a ...","PeriodicalId":161337,"journal":{"name":"Southern African Journal of Aquatic Sciences","volume":"7 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":"126951269","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
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