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
|
Day JJ, Steell EM, Vigliotta TR, Withey LA, Bills R, Friel JP, Genner MJ, Stiassny MLJ. Exceptional levels of species discovery ameliorate inferences of the biogeography and diversification of an Afrotropical catfish family. Mol Phylogenet Evol 2023; 182:107754. [PMID: 36906193 DOI: 10.1016/j.ympev.2023.107754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 02/24/2023] [Accepted: 03/05/2023] [Indexed: 03/13/2023]
Abstract
Endeavours in species discovery, particularly the characterisation of cryptic species, have been greatly aided by the application of DNA molecular sequence data to phylogenetic reconstruction and inference of evolutionary and biogeographic processes. However, the extent of cryptic and undescribed diversity remains unclear in tropical freshwaters, where biodiversity is declining at alarming rates. To investigate how data on previously undiscovered biodiversity impacts inferences of biogeography and diversification dynamics, we generated a densely sampled species-level family tree of Afrotropical Mochokidae catfishes (220 valid species) that was ca. 70 % complete. This was achieved through extensive continental sampling specifically targeting the genus Chiloglanis a specialist of the relatively unexplored fast-flowing lotic habitat. Applying multiple species-delimitation methods, we report exceptional levels of species discovery for a vertebrate genus, conservatively delimiting a staggering ca. 50 putative new Chiloglanis species, resulting in a near 80 % increase in species richness for the genus. Biogeographic reconstructions of the family identified the Congo Basin as a critical region in the generation of mochokid diversity, and further revealed complex scenarios for the build-up of continental assemblages of the two most species rich mochokid genera, Synodontis and Chiloglanis. While Syndontis showed most divergence events within freshwater ecoregions consistent with largely in situ diversification, Chiloglanis showed much less aggregation of freshwater ecoregions, suggesting dispersal as a key diversification process in this older group. Despite the significant increase in mochokid diversity identified here, diversification rates were best supported by a constant rate model consistent with patterns in many other tropical continental radiations. While our findings highlight fast-flowing lotic freshwaters as potential hotspots for undescribed and cryptic species diversity, a third of all freshwater fishes are currently threatened with extinction, signifying an urgent need to increase exploration of tropical freshwaters to better characterise and conserve its biodiversity.
Collapse
Affiliation(s)
- Julia J Day
- Department of Genetics, Evolution and Environment, University College London, Gower Street, London WC1E 6BT, UK.
| | - Elizabeth M Steell
- Department of Genetics, Evolution and Environment, University College London, Gower Street, London WC1E 6BT, UK
| | - Thomas R Vigliotta
- Department of Ichthyology, American Museum of Natural History, New York, NY, USA
| | - Lewis A Withey
- Department of Genetics, Evolution and Environment, University College London, Gower Street, London WC1E 6BT, UK
| | - Roger Bills
- South African Institute for Aquatic Biodiversity, Private Bag, 1015, 6140 Grahamstown, South Africa
| | - John P Friel
- Alabama Museum of Natural History, The University of Alabama, Box 870340, 35487-0340 Tuscaloosa, AL, USA
| | - Martin J Genner
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24, Tyndall Avenue, Bristol BS8 1TQ, UK
| | - Melanie L J Stiassny
- Department of Ichthyology, American Museum of Natural History, New York, NY, USA
| |
Collapse
|
3
|
Sarmento-Soares LM, Martins-Pinheiro RF, Casagranda MD. Endemicity Analysis of the Ichtyofauna of the Rio Doce Basin, Southeastern Brazil. AN ACAD BRAS CIENC 2022; 94:e20210646. [PMID: 35766599 DOI: 10.1590/0001-3765202220210646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Accepted: 10/01/2021] [Indexed: 11/22/2022] Open
Abstract
The Rio Doce is a very important freshwater system in Brazil running through the Atlantic Forest, however available information about its biodiversity is scarce. In 2015, the Rio Doce basin was damaged by a burst of Fundão tailing dam in Mariana (Minas Gerais) causing an extraordinary environmental damage, with consequences still incompletely known. In the present paper we analyzed 6042 latitude/longitude records of 208 fish species from the Rio Doce deposited in collections prior to November 2015, in order to identify areas of endemism in the river before the burst. Several areas of endemism were identified along the basin, most of them describing small and novel patterns. Our analyses helped to identify areas of major diversity along the basin as well as information gaps concerning fish sampling. We hope this contribution will help obtaining quantitative measures on the impact caused by the Fundão dam catastrophe on fish biodiversity and will be useful to orient general actions towards the restoration of the basin.
Collapse
Affiliation(s)
- Luisa M Sarmento-Soares
- Programa de Pós-Graduação em Biologia Animal, Universidade Federal do Espírito Santo, Prédio Bárbara Weinberg, Campus de Goiabeiras, Av. Fernando Ferrari, 514, Goiabeiras, 29043-900 Vitória, ES, Brazil.,Programa de Pós-Graduação em Ecologia, Universidade Estadual de Feira de Santana, Av. Transnordestina, s/n, Novo Horizonte, 44036-900 Feira de Santana, BA, Brazil.,Instituto Nossos Riachos (INR), Estrada de Itacoatiara, 356, Casa 4, 24348-095 Niterói, RJ, Brazil
| | | | | |
Collapse
|
4
|
Oliveira-Silva L, Santos SAD, Lopes MM, Zanata AM. A new species of Characidium (Characiformes: Crenuchidae) from the rio Doce basin, Brazil. NEOTROPICAL ICHTHYOLOGY 2022. [DOI: 10.1590/1982-0224-2021-0125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Abstract A new species of Characidium is described from the tributaries of the upper and middle rio Doce basin, Minas Gerais, Brazil. The new species is distinguished from most congeners, except C. cricarense, C. hasemani, C. helmeri, C. kalunga, C. pterostictum, C. schubarti, C. summus, and C. travassosi by lacking scales in the area between the anterior limit of the isthmus and the anterior margin of cleithrum. The new species differs from the aforementioned species by a series of characters, including the presence of the adipose fin, 2–4 scales between the anus and anal fin, two rows of dentary teeth, presence of the parietal branch of the supraorbital canal, 4 scale rows above the lateral line, and absence of two conspicuous inclined dark bands on each caudal-fin lobe. The new species further differs from most congeners with an unscaled ventral surface of the isthmus by the presence of 33–34 pored scales on the lateral line and by the dark dashes on the caudal fin-rays not forming well-defined bands.
Collapse
|
5
|
Ximenes AM, Bittencourt PS, Machado VN, Hrbek T, Farias IP. Mapping the hidden diversity of the Geophagus sensu stricto species group (Cichlidae: Geophagini) from the Amazon basin. PeerJ 2021; 9:e12443. [PMID: 34909270 PMCID: PMC8641480 DOI: 10.7717/peerj.12443] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Accepted: 10/15/2021] [Indexed: 11/20/2022] Open
Abstract
South American freshwater ichthyofauna is taxonomically the most diverse on the planet, yet its diversity is still vastly underestimated. The Amazon basin alone holds more than half of this diversity. The evidence of this underestimation comes from the backlog of morphologically distinct, yet undescribed forms deposited in museum collections, and from DNA-based inventories which consistently identify large numbers of divergent lineages within even well-studied species groups. In the present study, we investigated lineage diversity within the Geophagus sensu stricto species group. To achieve these objectives, we analyzed 337 individuals sampled from 77 locations within and outside the Amazon basin representing 10 nominal and six morphologically distinct but undescribed species. We sequenced the mitochondrial cytochrome c oxidase subunit I (COI) and delimited lineages using four different single-locus species discovery methods (mPTP-15 lineages; LocMin-14 lineages; bGMYC-18 lineages; and GMYC-30 lineages). The six morphologically distinct but undescribed species were also delimited by the majority of the species discovery methods. Five of these lineages are restricted to a single collection site or a watershed and their habitats are threatened by human activities such as deforestation, agricultural activities and construction of hydroelectric plants. Our results also highlight the importance of combining DNA and morphological data in biodiversity assessment studies especially in taxonomically diverse tropical biotas.
Collapse
Affiliation(s)
- Aline Mourão Ximenes
- Departamento de Genética, Instituto de Ciências Biológicas, Universidade Federal do Amazonas, Manaus, Amazonas, Brazil.,Programa de Pós-Graduação em Genética, Conservação e Biologia Evolutiva, Instituto Nacional de Pesquisas da Amazônia, Manaus, Amazonas, Brazil
| | - Pedro Senna Bittencourt
- Departamento de Genética, Instituto de Ciências Biológicas, Universidade Federal do Amazonas, Manaus, Amazonas, Brazil
| | - Valéria Nogueira Machado
- Departamento de Genética, Instituto de Ciências Biológicas, Universidade Federal do Amazonas, Manaus, Amazonas, Brazil
| | - Tomas Hrbek
- Departamento de Genética, Instituto de Ciências Biológicas, Universidade Federal do Amazonas, Manaus, Amazonas, Brazil.,Biology Department, Trinity University, San Antonio, Texas, USA
| | - Izeni Pires Farias
- Departamento de Genética, Instituto de Ciências Biológicas, Universidade Federal do Amazonas, Manaus, Amazonas, Brazil
| |
Collapse
|
6
|
Ferreira DG, Galindo BA, Apolinário-Silva C, Nascimento RHC, Frantine-Silva W, Cavenagh AF, Silva MM, Feliciano DC, Aggio CEG, Zanatta AS, Carvalho S, Sofia SH. Influences of Small Hydroelectric Plants on the genetic differentiation of Neotropical freshwater fish populations: a case study. STUDIES ON NEOTROPICAL FAUNA AND ENVIRONMENT 2021. [DOI: 10.1080/01650521.2021.1994349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Dhiego G. Ferreira
- Grupo de Pesquisas em Ecologia, Recursos Naturais e Limnologia (GERCOL), Universidade Estadual do Norte Paraná, Cornélio Procópio, Brazil
| | - Bruno A. Galindo
- Grupo de Pesquisas em Ecologia, Recursos Naturais e Limnologia (GERCOL), Universidade Estadual do Norte Paraná, Cornélio Procópio, Brazil
| | - Caroline Apolinário-Silva
- Laboratório de Genética e Ecologia Animal (LAGEA), Depto. de Biologia Geral, Universidade Estadual de Londrina, Londrina, Brazil
| | - Raul H. C. Nascimento
- Laboratório de Genética e Ecologia Animal (LAGEA), Depto. de Biologia Geral, Universidade Estadual de Londrina, Londrina, Brazil
| | - Wilson Frantine-Silva
- Laboratório de Genética e Ecologia Animal (LAGEA), Depto. de Biologia Geral, Universidade Estadual de Londrina, Londrina, Brazil
| | - Analiza F. Cavenagh
- Laboratório de Genética e Ecologia Animal (LAGEA), Depto. de Biologia Geral, Universidade Estadual de Londrina, Londrina, Brazil
| | - Matheus M. Silva
- Grupo de Pesquisas em Ecologia, Recursos Naturais e Limnologia (GERCOL), Universidade Estadual do Norte Paraná, Cornélio Procópio, Brazil
| | - Daniele C. Feliciano
- Grupo de Pesquisas em Ecologia, Recursos Naturais e Limnologia (GERCOL), Universidade Estadual do Norte Paraná, Cornélio Procópio, Brazil
| | - Carlos E. G. Aggio
- Grupo de Pesquisas em Ecologia, Recursos Naturais e Limnologia (GERCOL), Universidade Estadual do Norte Paraná, Cornélio Procópio, Brazil
| | - Augusto S. Zanatta
- Grupo de Pesquisas em Ecologia, Recursos Naturais e Limnologia (GERCOL), Universidade Estadual do Norte Paraná, Cornélio Procópio, Brazil
| | - Sandremir Carvalho
- Grupo de Pesquisas em Ecologia, Recursos Naturais e Limnologia (GERCOL), Universidade Estadual do Norte Paraná, Cornélio Procópio, Brazil
| | - Silvia H. Sofia
- Laboratório de Genética e Ecologia Animal (LAGEA), Depto. de Biologia Geral, Universidade Estadual de Londrina, Londrina, Brazil
| |
Collapse
|
7
|
Tagliacollo VA, Dagosta FCP, Pinna MD, Reis RE, Albert JS. Assessing extinction risk from geographic distribution data in Neotropical freshwater fishes. NEOTROPICAL ICHTHYOLOGY 2021. [DOI: 10.1590/1982-0224-2021-0079] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Abstract The IUCN Red List (RL) provides high-quality conservation assessments for individual species, yet the rate and scale of environmental deterioration globally challenges the conservation community to develop expedited methods for risk assessment. Here we compare threat assessments for 3,001 species of Neotropical freshwater fishes (NFF) in the IUCN–RL using readily accessible data types as proxies for extinction risk: geographic range, elevation, and species publication date. Furthermore, using geographic and taxonomic data alone, we generated preliminary conservation assessments for 2,334 NFF species currently awaiting IUCN assessment, identifying an additional 671 NFF species as potentially threatened. This number of potentially threatened species represents an increase of 59% over the number of species currently assigned to threat categories by the IUCN–RL. These results substantially expand the number of threatened NFF species from 422 currently on the IUCN RL to 1,093 species as threatened or potentially threatened, representing about 18% of all NFF species. Extinction risk is greater in species with smaller geographic ranges, which inhabit upland rivers, and which were described more recently. We propose the Central and Southern Andes, and Eastern Guiana Shield as priorities in the upcoming IUCN RL assessment of NFF species conservation risk.
Collapse
Affiliation(s)
| | | | - Mário de Pinna
- 1 Museu de Zoologia da Universidade de São Paulo, Brazil
| | - Roberto E. Reis
- Pontifícia Universidade Católica do Rio Grande do Sul, Brazil
| | | |
Collapse
|
8
|
Andrade ICP, Krolow TK, Boldrini R, Pelicice FM. Diversity of EPT (Ephemeroptera, Plecoptera, Trichoptera) Along Streams Fragmented by Waterfalls in the Brazilian Savanna. NEOTROPICAL ENTOMOLOGY 2020; 49:203-212. [PMID: 31912446 DOI: 10.1007/s13744-019-00751-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 12/13/2019] [Indexed: 06/10/2023]
Abstract
In stream ecosystems, waterfalls intercept the fluvial continuum and limit the dispersion of aquatic organisms. However, the barrier effect may be minimized or absent for insects whose life cycle is not restricted to the aquatic environment (i.e., winged adults), such as the orders Ephemeroptera, Plecoptera and Trichoptera (EPT). In this study, we investigated EPT diversity (abundance, richness, and composition) in savanna headwater streams (Cerrado Domain, Brazil) to investigate the hypothesis that large waterfalls have little effect on instream assemblage structure. During 2017 and 2018, we sampled EPTs and measured environmental conditions at reaches adjacent (downstream and upstream) to waterfalls (5 to 70 m high). We collected 2532 immature specimens of 33 genera, including the first record of 14 genera of Ephemeroptera, 11 Trichoptera, and three Plecoptera for the Tocantins State. Hydro-geomorphic and streambed conditions varied among sites, but they were not related to the presence of waterfalls. Assemblage structure was similar between downstream and upstream reaches, with no significant difference in taxa richness, abundance, and composition. This pattern was consistently observed considering all data combined, and each order separately. These results support the hypothesis that physical barriers have weak effects on EPT assemblages at small spatial scales, where strong dispersal and habitat similarity probably homogenizes the structure of local assemblages in stream corridors adjacent to large waterfalls. The study provides important information about factors driving the distribution of biodiversity in savanna streams, which are relevant to support conservation and management plans in the Brazilian Cerrado.
Collapse
Affiliation(s)
- I C P Andrade
- Programa de Pós-Graduação em Biodiversidade, Ecologia e Conservação (PPGBEC), Universidade Federal do Tocantins - UFT, Coordenação de Ciências Biológicas, Porto Nacional, TO, Brasil.
| | - T K Krolow
- Programa de Pós-Graduação em Biodiversidade, Ecologia e Conservação (PPGBEC), Universidade Federal do Tocantins - UFT, Coordenação de Ciências Biológicas, Porto Nacional, TO, Brasil
| | - R Boldrini
- Laboratório de Entomologia, Centro de Estudos da Biodiversidade (CBio), Univ Federal de Roraima (UFRR), Campus Paricarana, Boa Vista, Brasil
| | - F M Pelicice
- Programa de Pós-Graduação em Biodiversidade, Ecologia e Conservação (PPGBEC), Universidade Federal do Tocantins - UFT, Coordenação de Ciências Biológicas, Porto Nacional, TO, Brasil
| |
Collapse
|