1
|
Mutizwa TI, Kadye WT, Bragança PHN, Bere T, Chakona A. Hidden in the riffles: A new suckermouth catfish (Mochokidae, Chiloglanis) from the middle Zambezi River system, Zimbabwe. Zookeys 2024; 1197:57-91. [PMID: 38616924 PMCID: PMC11015093 DOI: 10.3897/zookeys.1197.114679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 01/22/2024] [Indexed: 04/16/2024] Open
Abstract
The recent surge in the discovery of hidden diversity within rheophilic taxa, particularly in West and East Africa, prompted a closer examination of the extent to which the current taxonomy may obscure the diversity of riffle-dwelling suckermouth catfishes in the genus Chiloglanis in southern Africa. Currently, the region comprises eight valid species within this genus. Seven of them have relatively narrow geographic distribution ranges except for C.neumanni, which is considered to be widely distributed, occurring from the Buzi River system in the south, and its northern limit being the eastward draining river systems in Tanzania. Recent surveys of the middle Zambezi River system revealed Chiloglanis specimens that were distinguishable from the known species of the genus from southern Africa. Integration of molecular and morphological data indicated that these specimens from the Mukwadzi River represent a new species to science, herein described as Chiloglaniscarnatus Mutizwa, Bragança & Chakona, sp. nov. This species is readily distinguished from its southern African congeners by the possession of a distinctive extended dermal tissue covering the base of the dorsal fin and the possession of ten mandibular teeth (vs 8, 12, or 14 in the other taxa). Results from this study add to the growing evidence of a high level of undocumented diversity within riffle-dwelling taxa in southern Africa.
Collapse
Affiliation(s)
- Tadiwa I. Mutizwa
- Department of Ichthyology and Fisheries Science, Faculty of Science, Rhodes University, Prince Alfred Street, PO Box 94, Makhanda, 6140, South AfricaNRF-South African Institute for Aquatic BiodiversityMakhandaSouth Africa
- NRF-South African Institute for Aquatic Biodiversity, Somerset Street, Private Bag 1015, Makhanda, 6140, South AfricaRhodes UniversityMakhandaSouth Africa
| | - Wilbert T. Kadye
- Department of Ichthyology and Fisheries Science, Faculty of Science, Rhodes University, Prince Alfred Street, PO Box 94, Makhanda, 6140, South AfricaNRF-South African Institute for Aquatic BiodiversityMakhandaSouth Africa
- NRF-South African Institute for Aquatic Biodiversity, Somerset Street, Private Bag 1015, Makhanda, 6140, South AfricaRhodes UniversityMakhandaSouth Africa
| | - Pedro H. N. Bragança
- NRF-South African Institute for Aquatic Biodiversity, Somerset Street, Private Bag 1015, Makhanda, 6140, South AfricaRhodes UniversityMakhandaSouth Africa
- Department of Ichthyology, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, USADepartment of Ichthyology, American Museum of Natural HistoryNew YorkUnited States of America
| | - Taurai Bere
- School of Wildlife, Ecology and Conservation, Chinhoyi University of Technology, Private Bag 7724, Chinhoyi, ZimbabweChinhoyi University of TechnologyChinhoyiZimbabwe
| | - Albert Chakona
- Department of Ichthyology and Fisheries Science, Faculty of Science, Rhodes University, Prince Alfred Street, PO Box 94, Makhanda, 6140, South AfricaNRF-South African Institute for Aquatic BiodiversityMakhandaSouth Africa
- NRF-South African Institute for Aquatic Biodiversity, Somerset Street, Private Bag 1015, Makhanda, 6140, South AfricaRhodes UniversityMakhandaSouth Africa
| |
Collapse
|
2
|
Chandra Segaran T, Azra MN, Piah RM, Lananan F, Téllez-Isaías G, Gao H, Torsabo D, Kari ZA, Noordin NM. Catfishes: A global review of the literature. Heliyon 2023; 9:e20081. [PMID: 37810135 PMCID: PMC10559827 DOI: 10.1016/j.heliyon.2023.e20081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Revised: 09/06/2023] [Accepted: 09/11/2023] [Indexed: 10/10/2023] Open
Abstract
This study aims to elucidate the evolution of catfish research publications over recent decades, identify emerging research clusters, examine keyword patterns, determine major contributors (including authors, organizations, and funding agencies), and analyze their collaborative networks and citation bursts on a global scale. The USA, Brazil, China, and India collectively contribute approximately 67% of the total catfish research publications, with a marked increase in prevalence since 2016. The most frequently occurring and dominant keywords are "channel catfish" and "responses," respectively. Intriguingly, our findings reveal 28 distinct article clusters, with prominent clusters including "yellow catfish," "channel catfish", "pectoral girdle," "African catfish", "Rio Sao Francisco basin," "Edwardsiella ictaluri," and "temperature mediated". Concurrently, keyword clustering generates seven main clusters: "new species", "growth performance", "heavy metal", "gonadotropin-releasing", "essential oil", and "olfactory receptor". This study further anticipates future research directions, offering fresh perspectives on the catfish literature landscape. To the best of our knowledge, this is the first article to conduct a comprehensive mapping review of catfish research publications worldwide.
Collapse
Affiliation(s)
- Thirukanthan Chandra Segaran
- Institute of Climate Adaptation and Marine Biotechnology (ICAMB), Universiti Malaysia Terengganu (UMT), Kuala Nerus, 21030, Terengganu, Malaysia
| | - Mohamad Nor Azra
- Institute of Climate Adaptation and Marine Biotechnology (ICAMB), Universiti Malaysia Terengganu (UMT), Kuala Nerus, 21030, Terengganu, Malaysia
- Research Center for Marine and Land Bioindustry, Earth Sciences and Maritime Organization, National Research and Innovation Agency (BRIN), Lombok, 83352, Indonesia
| | - Rumeaida Mat Piah
- Faculty of Fisheries and Food Science, Universiti Malaysia Terengganu (UMT), Kuala Nerus, 21030, Terengganu, Malaysia
| | - Fathurrahman Lananan
- East Coast Environmental Research Institute, Universiti Sultan Zainal Abidin (UniSZA), Gong Badak Campus, Kuala Nerus, 21300, Terengganu, Malaysia
| | | | - Huan Gao
- School of Marine Science and Fisheries, Jiangsu Ocean University, No. 59 Cangwu Road, Haizhou District, Lianyungang City, Jiangsu, China
| | - Donald Torsabo
- Faculty of Fisheries and Food Science, Universiti Malaysia Terengganu (UMT), Kuala Nerus, 21030, Terengganu, Malaysia
- Department of Fisheries and Aquaculture, Federal University of Agriculture Makurdi, Makurdi, Benue State, Nigeria
| | - Zulhisyam Abdul Kari
- Department of Agricultural Science, Faculty of Agro-Based Industry, Universiti Malaysia Kelantan, 17600, Jeli, Kelantan, Malaysia
| | - Noordiyana Mat Noordin
- Faculty of Fisheries and Food Science, Universiti Malaysia Terengganu (UMT), Kuala Nerus, 21030, Terengganu, Malaysia
- Higher Institution Centre of Excellence (HICoE), Institute of Tropical Aquaculture and Fisheries, Universiti Malaysia Terengganu, 21030, Kuala Nerus, Terengganu, Malaysia
| |
Collapse
|
3
|
Sithole Y, Musschoot T, Huyghe CET, Chakona A, Vreven EJWMN. A new species of Parauchenoglanis (Auchenoglanididae: Siluriformes) from the Upper Lualaba River (Upper Congo), with further evidence of hidden species diversity within the genus. JOURNAL OF FISH BIOLOGY 2023; 102:1387-1414. [PMID: 37039421 DOI: 10.1111/jfb.15309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Accepted: 01/05/2023] [Indexed: 06/09/2023]
Abstract
Parauchenoglanis zebratus sp. nov. is a new species endemic to the Upper Lualaba in the Upper Congo Basin. It is distinguished from all its congeners known from the Congo Basin and adjacent basins by the presence of (1) distinctive dark-brown or black vertical bars on the lateral side of the body, at least for specimens about ≥120 mm LS , (2) a broad and triangular humeral process embedded under the skin and (3) a well-serrated pectoral-fin spine. Genetic analysis based on mtDNA COI sequences confirmed the genetic distinctiveness (2.8%-13.6% K2P genetic divergence) of P. zebratus sp. nov. from congeners within the Congo and adjacent river basins. The study also revealed additional undocumented diversity within P. ngamensis, P. pantherinus, P. punctatus and P. balayi, indicating the need for further in-depth alpha-taxonomic attention to provide more accurate species delimitations for this genus. The discovery of yet another new species endemic to the Upper Lualaba, and this well outside the currently established protected areas, highlights the critical need for further assessments to accurately document the species diversity to guide freshwater conservation prioritisation and biodiversity management in this region.
Collapse
Affiliation(s)
- Yonela Sithole
- National Research Foundation - South African Institute for Aquatic Biodiversity, Makhanda, South Africa
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda, South Africa
| | - Tobias Musschoot
- Vertebrate Section, Ichthyology, Royal Museum for Central Africa, Tervuren, Belgium
| | - Charlotte E T Huyghe
- Vertebrate Section, Ichthyology, Royal Museum for Central Africa, Tervuren, Belgium
- Department of Environmental Sciences, Zoological Institute, University of Basel, Basel, Switzerland
| | - Albert Chakona
- National Research Foundation - South African Institute for Aquatic Biodiversity, Makhanda, South Africa
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda, South Africa
| | - Emmanuel J W M N Vreven
- National Research Foundation - South African Institute for Aquatic Biodiversity, Makhanda, South Africa
- Vertebrate Section, Ichthyology, Royal Museum for Central Africa, Tervuren, Belgium
- Biology Department, Fish Diversity and Conservation, KU Leuven, Leuven, Belgium
| |
Collapse
|
4
|
Chakona A, Jordaan MS, Raimondo DC, Bills RI, Skelton PH, van der Colff D. Diversity, distribution and extinction risk of native freshwater fishes of South Africa. JOURNAL OF FISH BIOLOGY 2022; 100:1044-1061. [PMID: 35170047 DOI: 10.1111/jfb.15011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 12/08/2021] [Accepted: 02/13/2022] [Indexed: 06/14/2023]
Abstract
Extinction risk for 101 valid species and 18 unique genetic lineages of native freshwater fishes of South Africa was assessed in 2016 following the IUCN Red List criteria. An additional five species (three new species that were described and two species that were revalidated subsequent to the 2016 assessments) were assessed in the present study. A synthesis of the outcome of the assessments of the 106 valid species and 18 genetic lineages indicates that 45 (36%) of South Africa's freshwater fish taxa are threatened (7 Critically Endangered, 25 Endangered, 13 Vulnerable). Of the remaining taxa, 17 (14%) are listed as Near Threatened, 57 (46%) are Least Concern and five (4%) are Data Deficient. More than 60% of the endemic taxa are threatened. The Cape Fold Ecoregion has the highest proportion of threatened taxa (67%) due to the existence of a unique assemblage of narrow-range endemic species. Galaxias and Pseudobarbus have the highest number of highly threatened taxa as most of the species and lineages in these genera are classified as either CR or EN. Major threats to the native freshwater fishes of the country are invasive fish species, deterioration of water quality, impoundments and excessive water abstraction, land use changes and modification of riverine habitats. Immediate conservation efforts should focus on securing remnant populations of highly threatened taxa and preventing deterioration in threat status, because recovery is rare. Accurate delimitation of species boundaries, mapping their distribution ranges, improved knowledge of pressures and long-term monitoring of population trends need to be prioritised to generate credible data for the 2026 IUCN threat status assessments and designation of important fish areas as part of the National Freshwater Ecosystem Priority Areas (NFEPA) initiative.
Collapse
Affiliation(s)
- Albert Chakona
- NRF-South African Institute for Aquatic Biodiversity (NRF-SAIAB), Makhanda (Grahamstown), South Africa
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda (Grahamstown), South Africa
| | - Martine S Jordaan
- NRF-South African Institute for Aquatic Biodiversity (NRF-SAIAB), Makhanda (Grahamstown), South Africa
- CapeNature Biodiversity Capabilities Unit, Stellenbosch
- Center of Excellence for Invasion Biology, CapeNature Biodiversity Capabilities Unit, Stellenbosch
| | - Domitilla C Raimondo
- South African National Biodiversity Institute Threatened Species Program, Kirstenbosch National Botanical Gardens, Cape Town
| | - Roger I Bills
- NRF-South African Institute for Aquatic Biodiversity (NRF-SAIAB), Makhanda (Grahamstown), South Africa
| | - Paul H Skelton
- NRF-South African Institute for Aquatic Biodiversity (NRF-SAIAB), Makhanda (Grahamstown), South Africa
| | - Dewidine van der Colff
- Center of Excellence for Invasion Biology, CapeNature Biodiversity Capabilities Unit, Stellenbosch
- South African National Biodiversity Institute Threatened Species Program, Kirstenbosch National Botanical Gardens, Cape Town
| |
Collapse
|