African Journal of Aquatic Science最新文献

Assessment of the ecological integrity and fish community structures of the uMngeni River, KwaZulu-Natal, South Africa. 南非夸祖鲁-纳塔尔省uMngeni河生态完整性和鱼类群落结构评估。

IF 1 4区环境科学与生态学

African Journal of Aquatic Science Pub Date : 2025-12-05 Epub Date: 2025-11-18 DOI: 10.2989/16085914.2025.2564685

Pumla Dlamini, Colleen T Downs, Matthew Burnett, Gordon O'Brien

{"title":"Assessment of the ecological integrity and fish community structures of the uMngeni River, KwaZulu-Natal, South Africa.","authors":"Pumla Dlamini, Colleen T Downs, Matthew Burnett, Gordon O'Brien","doi":"10.2989/16085914.2025.2564685","DOIUrl":"10.2989/16085914.2025.2564685","url":null,"abstract":"The uMngeni River is economically important as it provides water to two of the largest cities in KwaZulu-Natal Province, South Africa. As such, protecting the river and the life within it is also of great importance. In this study, we used fish community structure as an indicator of ecosystem health by assessing how fish communities responded to changes in habitat composition and water quality as a consequence of anthropogenic activities, using the Fish Response Assessment Index (FRAI). We used multivariate statistical analyses to determine differences in fish communities and drivers of change in these communities. We found that the ecological integrity of the uMngeni River (and its tributaries) tended to degrade from upper to lower reaches in response to various anthropogenic activities. Examples of degradation included flow modification and migration barriers from instream structures, the introduction of invasive fish species, and water quality alterations from rural and urban settlements. Multivariate analyses showed that variation among the sites selected in this study was significantly driven by changes in velocity-depth classes, substrate type, and water quality, all of which can be influenced by flow modifications. The FRAI ecological scores and multivariate analyses presented in the study provide a baseline for managing the uMngeni River's fish communities, highlighting that flow regime, river fragmentation, and alien invasive species negatively impact these.","PeriodicalId":7864,"journal":{"name":"African Journal of Aquatic Science","volume":"50 4","pages":"245-265"},"PeriodicalIF":1.0,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7618539/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145848788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Potential for a commercial inland fishery or just another water storage facility at Spring Grove Dam, KwaZulu-Natal, South Africa? 商业内陆渔业的潜力还是仅仅是南非夸祖鲁-纳塔尔省斯普林格罗夫大坝的另一个蓄水设施？

IF 1 4区环境科学与生态学

African Journal of Aquatic Science Pub Date : 2024-06-21 Epub Date: 2024-10-05 DOI: 10.2989/16085914.2024.2373096

Matthew J Burnett, Céline Hanzen, Alex Whitehead, Gordon C O'Brien, Colleen T Downs

{"title":"Potential for a commercial inland fishery or just another water storage facility at Spring Grove Dam, KwaZulu-Natal, South Africa?","authors":"Matthew J Burnett, Céline Hanzen, Alex Whitehead, Gordon C O'Brien, Colleen T Downs","doi":"10.2989/16085914.2024.2373096","DOIUrl":"10.2989/16085914.2024.2373096","url":null,"abstract":"South Africa's inland fisheries are generally undervalued, though there is developing interest in the sector. Spring Grove Dam in the KwaZulu-Natal Midlands became operational as a water storage facility in 2013 to provide water to the growing urban population in the province. We assessed whether the impoundment could potentially support commercial fisheries as had been proposed during its design and construction. We conducted seasonal fish community surveys from 2020 to 2021 at sites along the impoundment and in the mainstem of the Mooi River which feeds into the impoundment. We recorded a total of nine fish species, including six non-native fishes with invasive characteristics. Only three of 10 expected native species were found, namely the KwaZulu-Natal yellowfish Labeobarbus natalensis, chubbyhead barb Enteromius anoplus and African longfin eel Anguilla mossambica. Catch per unit effort (CPUE) was low in the sampling surveys using mostly gillnets and fyke nets, and relatively low yields (14.97 tonnes yr-1) were subsequently calculated for the impoundment, making commercial fisheries unviable. However, the existing subsistence and recreational fisheries for non-native salmonids and the native L. natalensis would benefit by controlling the distribution range and abundances of non-native centrachids Micropterus spp. We offer recommendations and suggestions for management plans for Spring Grove Dam in the context of local fish diversity, a changing climate, further construction of water storage facilities on east-flowing rivers in the province, and a nationally neglected inland fishery industry.","PeriodicalId":7864,"journal":{"name":"African Journal of Aquatic Science","volume":"49 2","pages":"145-158"},"PeriodicalIF":1.0,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7618466/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145755113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

South African coastal outlets and estuaries: what defines an estuary versus an outlet? 南非沿海出海口和河口：河口和出海口的定义是什么？

IF 1.4 4区环境科学与生态学

African Journal of Aquatic Science Pub Date : 2023-12-15 DOI: 10.2989/16085914.2023.2288342

A. Whitfield

引用次数: 0

Water quality monitoring and measuring physicochemical parameters using wireless sensor networks 利用无线传感器网络进行水质监测和理化参数测量

IF 1.4 4区环境科学与生态学

African Journal of Aquatic Science Pub Date : 2023-12-13 DOI: 10.2989/16085914.2023.2277955

N. Satyanarayana Murthy, SF Ahamed

引用次数: 0

A bibliometric study on diatom DNA meta-barcording for water quality monitoring: a global perspective 用于水质监测的硅藻 DNA 元记录文献计量学研究：全球视角

IF 1.4 4区环境科学与生态学

African Journal of Aquatic Science Pub Date : 2023-12-13 DOI: 10.2989/16085914.2023.2282493

EO Mbao, J. Nyika, T. Sheng, B. Ochieng, L. Sitoki, SO Oduor, N. Kitaka, L. Olaka, C. Tan

引用次数: 0

Analysis of freshwater diatom deformities in the Karoo, South Africa 南非卡鲁淡水硅藻畸变分析

IF 1.4 4区环境科学与生态学

African Journal of Aquatic Science Pub Date : 2023-12-11 DOI: 10.2989/16085914.2023.2282491

M. Holmes, EE Campbell, M. de Wit, J.C. Taylor

引用次数: 0

Effect of abattoir activities on the quality of water and surrounding soil of the Anwai River in Asaba, Nigeria 屠宰场活动对尼日利亚阿萨巴 Anwai 河水质和周围土壤的影响

IF 1.4 4区环境科学与生态学

African Journal of Aquatic Science Pub Date : 2023-10-02 DOI: 10.2989/16085914.2023.2288346

OT Fatunsin, IG Enenya, P. Ebomese

{"title":"Effect of abattoir activities on the quality of water and surrounding soil of the Anwai River in Asaba, Nigeria","authors":"OT Fatunsin, IG Enenya, P. Ebomese","doi":"10.2989/16085914.2023.2288346","DOIUrl":"https://doi.org/10.2989/16085914.2023.2288346","url":null,"abstract":"The Anwai River is the most important river in Asaba, Nigeria, because of its many uses, and these include abattoir activities. The aim of this study was to assess the surface water and surrounding soil of the Anwai River for the effects of abattoir activities during the wet and dry seasons of 2020. The quality of soil and water samples was analysed using standard procedures as set by the American Public Health Association. Results of water analyses showed that pH, total dissolved solids and total suspended solids varied from 6.45 to 6.67, 13.50 mg L−1 to 24.42 mg L−1, and 2.19 ± 0.04 mg L−1 to 10.79 mg L−1, respectively. Soil pH, total organic content, Pd and Cr had a range of 5.83 to 7.65 pH units, 0.15 to 2.74%, 1.88 ± 0.03 to 22.8 ± 0.28 mg kg−1, and 0.86 ± 0.03 to 4.87 ± 0.04 mg kg−1, respectively. There were significant differences between Upstream, Midstream (by the abattoir) and Downstream samples; however, there were no significant differences between dry and wet season results for most of the parameters. Midstream values for the water quality index were 104.89 and 119.34 in the dry and wet seasons, respectively, which showed that the Midstream water samples were poor. The findings of this study showed that the abattoir activities were negatively impacting river water and soil quality.","PeriodicalId":7864,"journal":{"name":"African Journal of Aquatic Science","volume":"25 1","pages":"404 - 415"},"PeriodicalIF":1.4,"publicationDate":"2023-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139324407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Validation of the generic name Prescottiella gen. nov. (Desmidiales, Zygnematophyceae): a rare African desmid 属名Prescottiella gen.

IF 1.4 4区环境科学与生态学

African Journal of Aquatic Science Pub Date : 2023-10-02 DOI: 10.2989/16085914.2023.2258176

S. Janse van Vuuren, A. Levanets

引用次数: 0

A preliminary study into the detection of fish environmental DNA in selected South African estuaries 南非部分河口鱼类环境 DNA 检测初步研究

IF 1.4 4区环境科学与生态学

African Journal of Aquatic Science Pub Date : 2023-10-02 DOI: 10.2989/16085914.2023.2288341

Keneilwe Thekiso, Tshoanelo Miya, Dominique A Cowart

{"title":"A preliminary study into the detection of fish environmental DNA in selected South African estuaries","authors":"Keneilwe Thekiso, Tshoanelo Miya, Dominique A Cowart","doi":"10.2989/16085914.2023.2288341","DOIUrl":"https://doi.org/10.2989/16085914.2023.2288341","url":null,"abstract":"Environmental DNA (eDNA) is a powerful technique for the non-invasive and comprehensive monitoring of entire ecosystems. Despite its many advantages, the use of eDNA in South Africa as an assessment tool for fish biodiversity is largely underutilised. This study was performed as an initial screening to assess the efficiency of the eDNA method for characterising fish communities in South African waters using the metabarcoding approach. Water samples were collected from eight estuaries and vacuum filtered using 0.45 μm nylon membrane filters. DNA was extracted from the filters, and sample extracts underwent PCR assaying using MiFish primers for the 12S rRNA gene, prior to being sequenced on the Illumina MiSeq platform. The resulting sequence data produced 1 574 092 raw reads, which resulted in 119 operational taxonomic units (OTUs) after filtering and clustering. Taxonomic assignment of the OTUs produced four different taxonomic groups and one group representing unidentified sequences. The group with the highest number of OTUs (54%) was assigned to fish taxa consisting of 12 families and 22 genera identified across all estuaries, with only 16 taxa identified to species level. As this was a preliminary study, few samples were collected, and therefore several recommendations for a more comprehensive study design are provided. Overall, these results support the hypothesis that the eDNA metabarcoding approach can efficiently detect fish species in South African estuarine environments.","PeriodicalId":7864,"journal":{"name":"African Journal of Aquatic Science","volume":"26 1","pages":"393 - 403"},"PeriodicalIF":1.4,"publicationDate":"2023-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139324079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Monogenean parasites of Pseudocrenilabrus philander (Weber, 1897) (Teleostei: Cichlidae) in the middle Limpopo River basin, southern Africa 非洲南部林波波河流域中部的菲鱼伪crenilabrus（Weber，1897）的单基因寄生虫（Teleostei：丽鱼科）

IF 1.4 4区环境科学与生态学

African Journal of Aquatic Science Pub Date : 2023-07-03 DOI: 10.2989/16085914.2023.2218433

I. Walter, I. Přikrylová, M. Barson, W. Luus-Powell

{"title":"Monogenean parasites of Pseudocrenilabrus philander (Weber, 1897) (Teleostei: Cichlidae) in the middle Limpopo River basin, southern Africa","authors":"I. Walter, I. Přikrylová, M. Barson, W. Luus-Powell","doi":"10.2989/16085914.2023.2218433","DOIUrl":"https://doi.org/10.2989/16085914.2023.2218433","url":null,"abstract":"The study aimed to isolate and describe the monogenean parasites of the southern mouthbrooder, Pseudocrenilabrus philander (Weber, 1897), an endemic fish species of the Limpopo River basin in southern Africa. During summer and winter between November 2013 and August 2014, 86 specimens of P. philander were collected from the Nwanedi River (South Africa) and Bubi River (Zimbabwe). Monogenean parasites were isolated from the skin, gills and stomach. Morphometric evaluations revealed the presence of six species from three genera: Enterogyrus coronatus Pariselle, Lambert & Euzet, 1991, Gyrodactylus thlapi Christison, Shinn & van As, 2005, Cichlidogyrus philander Douëllou, 1993, Cichlidogyrus tilapiae Paperna, 1960, and Cichlidogyrus sp. 1 and sp. 2. Morphological and metrical characterisations of the species found during the present study are presented in detail. The presence of C. philander from the Nwanedi River as well as E. coronatus and C. tilapiae from the Bubi River represent new geographical records. Pseudocrenilabrus philander is reported for the first time to host C. tilapiae.","PeriodicalId":7864,"journal":{"name":"African Journal of Aquatic Science","volume":"48 1","pages":"327 - 337"},"PeriodicalIF":1.4,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41346253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0