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Jense C, Adams M, Raadik TA, Waters JM, Morgan DL, Barmuta LA, Hardie SA, Deagle BE, Burridge CP. Cryptic diversity within two widespread diadromous freshwater fishes (Teleostei: Galaxiidae). Ecol Evol 2024; 14:e11201. [PMID: 38799386 PMCID: PMC11116845 DOI: 10.1002/ece3.11201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 03/03/2024] [Accepted: 03/19/2024] [Indexed: 05/29/2024] Open
Abstract
Identification of taxonomically cryptic species is essential for the effective conservation of biodiversity. Freshwater-limited organisms tend to be genetically isolated by drainage boundaries, and thus may be expected to show substantial cryptic phylogenetic and taxonomic diversity. By comparison, populations of diadromous taxa, that migrate between freshwater and marine environments, are expected to show less genetic differentiation. Here we test for cryptic diversity in Australasian populations (both diadromous and non-diadromous) of two widespread Southern Hemisphere fish species, Galaxias brevipinnis and Galaxias maculatus. Both mtDNA and nuclear markers reveal putative cryptic species within these taxa. The substantial diversity detected within G. brevipinnis may be explained by its strong climbing ability which allows it to form isolated inland populations. In island populations, G. brevipinnis similarly show deeper genetic divergence than those of G. maculatus, which may be explained by the greater abundance of G. maculatus larvae in the sea allowing more ongoing dispersal. Our study highlights that even widespread, 'high-dispersal' species can harbour substantial cryptic diversity and therefore warrant increased taxonomic and conservation attention.
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Affiliation(s)
- Charlotte Jense
- Discipline of Biological Sciences, School of Natural SciencesUniversity of TasmaniaHobartTasmaniaAustralia
| | - Mark Adams
- Evolutionary Biology UnitSouth Australian MuseumAdelaideSouth AustraliaAustralia
- School of Biological SciencesThe University of AdelaideAdelaideSouth AustraliaAustralia
| | - Tarmo A. Raadik
- Department of Energy, Environment and Climate ActionArthur Rylah Institute for Environmental ResearchHeidelbergVictoriaAustralia
| | | | - David L. Morgan
- Centre for Sustainable Aquatic Ecosystems, Harry Butler InstituteMurdoch UniversityMurdochWestern AustraliaAustralia
| | - Leon A. Barmuta
- Discipline of Biological Sciences, School of Natural SciencesUniversity of TasmaniaHobartTasmaniaAustralia
| | - Scott A. Hardie
- Discipline of Biological Sciences, School of Natural SciencesUniversity of TasmaniaHobartTasmaniaAustralia
| | - Bruce E. Deagle
- Australian National Fish CollectionCSIRO National Research Collections AustraliaHobartTasmaniaAustralia
| | - Christopher P. Burridge
- Discipline of Biological Sciences, School of Natural SciencesUniversity of TasmaniaHobartTasmaniaAustralia
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2
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Terblanche N, Measey J. The conservation value of freshwater habitats for frog communities of lowland fynbos. PeerJ 2023; 11:e15516. [PMID: 37304861 PMCID: PMC10249618 DOI: 10.7717/peerj.15516] [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: 11/17/2022] [Accepted: 05/15/2023] [Indexed: 06/13/2023] Open
Abstract
Amphibians are more threatened than any other vertebrate class, yet evidence for many threats is missing. The Cape lowland fynbos (endemic scrub biome) is threatened by habitat loss, and natural temporary freshwater habitats are removed in favour of permanent impoundments. In this study, we determine amphibian assemblages across different freshwater habitat types with special attention to the presence of invasive fish. We find that anuran communities differ primarily by habitat type, with permanent water habitats having more widespread taxa, while temporary water bodies have more range restricted taxa. Invasive fish are found to have a significant impact on frogs with toads most tolerant of their presence. Temporary freshwater habitats are a conservation priority in the area, and their amphibian assemblages represent endemic taxa that are intolerant of invasive fish. Conservation of a biodiverse amphibian assemblage in lowland fynbos areas will rely on the creation of temporary freshwater habitats, rather than a northern hemisphere pond based solution.
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Affiliation(s)
- Naas Terblanche
- Riverglade Retirement Village, Parklands, Unaffiliated, Cape Town, South Africa
| | - John Measey
- Centre for Invasion Biology, Department of Botany & Zoology, Stellenbosch University, Stellenbosch, South Africa
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3
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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.
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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
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4
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Campbell CSM, Dutoit L, King TM, Craw D, Burridge CP, Wallis GP, Waters JM. Genome‐wide analysis resolves the radiation of New Zealand's freshwater
Galaxias vulgaris
complex and reveals a candidate species obscured by mitochondrial capture. DIVERS DISTRIB 2022. [DOI: 10.1111/ddi.13629] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
| | - Ludovic Dutoit
- Department of Zoology University of Otago Dunedin New Zealand
| | - Tania M. King
- Department of Zoology University of Otago Dunedin New Zealand
| | - Dave Craw
- Department of Geology University of Otago Dunedin New Zealand
| | - Christopher P. Burridge
- Discipline of Biological Sciences, School of Natural Sciences University of Tasmania Hobart Australia
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5
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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.
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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
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6
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Kambikambi MJ, Kadye WT, Chakona A. Allopatric differentiation in the Enteromius anoplus complex in South Africa, with the revalidation of Enteromius cernuus and Enteromius oraniensis, and description of a new species, Enteromius mandelai (Teleostei: Cyprinidae). JOURNAL OF FISH BIOLOGY 2021; 99:931-954. [PMID: 33969484 DOI: 10.1111/jfb.14780] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2021] [Revised: 03/27/2021] [Accepted: 05/02/2021] [Indexed: 06/12/2023]
Abstract
The chubbyhead barb, Enteromius anoplus, as currently described, is the most widely distributed freshwater fish in South Africa. The species occurs in almost all the major river systems across the country, with the exception of the small coastal drainages on the south coast. The use of a comprehensive data set of mitochondrial (mtDNA) cytochrome b (cyt b) sequences uncovered the presence of four distinct lineages or operational taxonomic units (OTUs) within E. anoplus: (a) the Gouritz lineage endemic to the Gouritz River system, (b) the Olifants lineage endemic to the Olifants-Doring River system, (c) the Orange lineage endemic to the Orange River system and (d) the Eastern Cape lineage which is distributed across six river systems from the Great Fish to the Buffalo rivers in the Eastern Cape Province of South Africa. The present study provides a new diagnosis for E. anoplus s.s. (the Gouritz lineage), revalidates Enteromius cernuus (the Olifants lineage) and Enteromius oraniensis (the Orange lineage) as distinct species. The study also provides a description for a new species, Enteromius mandelai sp. nov (the Eastern Cape lineage). E. cernuus and E. mandelai differ from both E. anoplus and E. oraniensis by having a complete lateral line (vs. an incomplete lateral line in the latter species). E. cernuus further differs from the other three species by having long maxillary barbels which reach or exceed the vertical through the middle of the eye and the lowest number of circumpendicular scales (10-12 vs. 12-16 for the other three species). E. oraniensis is distinctive from the other three species by having inconspicuous barbels. These findings add to the growing body of literature that shows that the freshwater fishes of the Cape Fold and adjacent freshwater ecoregions have narrow geographic ranges. This has ramifications for conservation planning and management, as well as the understanding of the evolutionary history of the stream fishes in these global endemic hotspots.
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Affiliation(s)
- Manda J Kambikambi
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda, South Africa
- NRF-South African Institute for Aquatic Biodiversity, Makhanda, South Africa
| | - Wilbert T Kadye
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda, South Africa
| | - Albert Chakona
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda, South Africa
- NRF-South African Institute for Aquatic Biodiversity, Makhanda, South Africa
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7
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Mazungula DN, Chakona A. An integrative taxonomic review of the Natal mountain catfish, Amphilius natalensis Boulenger 1917 (Siluriformes, Amphiliidae), with description of four new species. JOURNAL OF FISH BIOLOGY 2021; 99:219-239. [PMID: 33635552 DOI: 10.1111/jfb.14714] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 02/18/2021] [Accepted: 02/23/2021] [Indexed: 06/12/2023]
Abstract
An integrative taxonomic analysis combining mitochondrial cytochrome oxidase subunit I sequences, morphology, colour pattern and two species delimitation approaches revealed the existence of five lineages within the Natal mountain catfish, Amphilius natalensis, in southern Africa. These lineages are separated by substantial genetic divergences (1.6%-9.46%), and they can be consistently distinguished from one another based on a combination of morphology and colour pattern differences. Additionally, the lineages are allopatrically distributed and confined to isolated river systems draining discrete mountain ranges, which makes gene flow among them unlikely. One of these lineages is A. natalensis s.s., which is confined to the uMngeni and Tukela river systems in KwaZulu Natal (KZN) Province in South Africa. The other four lineages represent new species to science which are described as Amphilius zuluorum sp. nov., endemic to the uMkhomazi River system in KZN, Amphilius engelbrechti sp. nov., endemic to the Inkomati River system in Mpumalanga Province in South Africa, Amphilius marshalli sp. nov., endemic to the Pungwe and Lower Zambezi river systems in Zimbabwe and Mozambique, and Amphilius leopardus sp. nov., endemic to the Ruo River in Malawi. The results show that Amphilius laticaudatus which is endemic to the Buzi River system in Zimbabwe and Mozambique, belongs to the A. natalensis s.l. complex. A redescription of A. laticaudatus is presented and an updated identification key for the mountain catfishes of southern Africa is provided.
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Affiliation(s)
- Daniel Nkosinathi Mazungula
- National Research Foundation - South African Institute for Aquatic Biodiversity, Makhanda (Grahamstown), South Africa
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda (Grahamstown), South Africa
| | - Albert Chakona
- National Research Foundation - South African Institute for Aquatic Biodiversity, Makhanda (Grahamstown), South Africa
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda (Grahamstown), South Africa
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8
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Baroni S, Damasceno RP, Almeida-Toledo LFD. Paraphyly and evolutionary independent lineages in Gymnotus pantherinus (Gymnotiformes: Gymnotidae) in the Brazilian Atlantic Forest Coastal Streams. Mol Phylogenet Evol 2021; 161:107159. [PMID: 33794394 DOI: 10.1016/j.ympev.2021.107159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Revised: 03/01/2021] [Accepted: 03/23/2021] [Indexed: 11/18/2022]
Abstract
In the Brazilian Atlantic Forest (AF), many terrestrial species with broad geographical distributions show high diversity and endemism of intraspecific lineages, as revealed by molecular genetic data. This pattern, however, is less explored in freshwater fishes. Gymnotus pantherinus is an electric fish endemic to the Brazilian coastal drainages that shows a wide distribution, ranging from the states of Bahia to Santa Catarina, an unusual pattern for AF fishes. It has been hypothesized that G. pantherinus is a species complex because distinct morphotypes were described for the species based on morphometric and meristic features. We used mitochondrial and nuclear data to test this hypothesis. Based on phylogenetic inference and multi-locus, multispecies coalescent methods, we identified six independent lineages, flagging them as candidate species. One such lineage is the recently described species G. refugio that is nested within G. pantherinus and renders it paraphyletic, showing it is a species complex. We named G. pantherinus stricto sensu the lineage that includes samples from the type locality (Santos, SP). Our results show that genetic lineages correspond only partially and far exceed the number of previously reported morphotypes. Genetic breaks in the group correspond to landscape features associated with the Serra do Mar mountain range and with riverine dynamics caused by sea level changes during the last glacial maximum. Moreover, we found evidence of river capture events affecting phylogeographic structure in the group. We uncovered an important dimension of diversity in the group and encourage further integration of genetic and phenotypic data. Such integration is a fruitful approach not only to reduce the gap between taxonomy and evolutionary history in Gymnotidae, but also to uncover the real AF biodiversity.
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Affiliation(s)
- Sabrina Baroni
- Instituto de Biociências, Universidade de São Paulo, São Paulo, SP 05508-090, Brazil.
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9
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Olsen T, Shelton JM, Dallas HF. Does thermal history influence thermal tolerance of the freshwater fish Galaxias zebratus in a global biodiversity hotspot? J Therm Biol 2021; 97:102890. [PMID: 33863447 DOI: 10.1016/j.jtherbio.2021.102890] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Revised: 02/13/2021] [Accepted: 02/16/2021] [Indexed: 10/22/2022]
Abstract
Compared to other climate regions of the world, Mediterranean regions are likely to experience more severe effects of climate change as rainfall decreases and temperatures increase. Global climate change models predict a reduction in rainfall and rise in the temperature of rivers in South Africa's Cape Fold Ecoregion (CFE) - a Mediterranean region in the south-west corner of the country. In the climate change context and with the prediction that stream temperatures will increase, determining thermal thresholds of freshwater fish in relation to their thermal history is a key element in understanding the potential impacts climate change and a rise in stream temperatures will have on already threatened freshwater fish. The ability of aquatic species to withstand warming in the CFE will be determined by its upper tolerance limit (critical thermal maximum, CTmax). A fish's CTmax can be influenced by several factors, including the thermal characteristics of its environment (thermal history). In this study, we set out to examine whether the thermal tolerance of an endemic CFE fish species, the Cape Galaxias, Galaxias zebratus Castelnau, 1861, is influenced by its thermal history. We hypothesised that CTmax of G. zebratus individuals from warmer sites will have higher CTmax values than individuals from cooler sites. Hourly in situ water temperature data were collected and the CTmax values were determined for fish (n = 15 per site) from ten sites on six rivers on the Cape Peninsula of the CFE, and regression analyses revealed that G. zebratus upper thermal tolerance limits are indeed significantly influenced by its thermal history (as characterised by the seven day moving average of daily mean, Mean_7). CTmax was positively related to the thermal history of the rivers, indicating that G. zebratus, and potentially other stenothermic CFE freshwater fish species, is likely to be particularly vulnerable to climate warming. These findings broaden our understanding of thermal history patterns on fish thermal tolerances in Mediterranean rivers, and support G. zebratus conservation by determining its biological temperature thresholds and thermal requirements. Thermal data should be used to monitor and manage stream temperatures to ensure Mediterranean stenotherms can persist in their natural environment.
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Affiliation(s)
- Toni Olsen
- Freshwater Research Centre, PO Box 43966, Scarborough, 7975, South Africa; University of Cape Town, Private Bag X3, Rondebosch, 7701, South Africa.
| | - Jeremy M Shelton
- Freshwater Research Centre, PO Box 43966, Scarborough, 7975, South Africa.
| | - Helen F Dallas
- Freshwater Research Centre, PO Box 43966, Scarborough, 7975, South Africa; Nelson Mandela University, PO Box 77000, Port Elizabeth, 6031, South Africa.
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10
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Chakona A, Gouws G, Kadye WT, Mpopetsi PP, Skelton PH. Probing hidden diversity to enhance conservation of the endangered narrow-range endemic Eastern Cape rocky, Sandelia bainsii (Castelnau 1861). KOEDOE: AFRICAN PROTECTED AREA CONSERVATION AND SCIENCE 2020. [DOI: 10.4102/koedoe.v62i1.1627] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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11
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Burridge CP, Waters JM. Does migration promote or inhibit diversification? A case study involving the dominant radiation of temperate Southern Hemisphere freshwater fishes. Evolution 2020; 74:1954-1965. [DOI: 10.1111/evo.14066] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 07/08/2020] [Accepted: 07/20/2020] [Indexed: 12/11/2022]
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12
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Kenthao A, Jearranaiprepame P. Ecomorphological diversification of some barbs and carps (Cyprininae, Cyprinidae) in the Lower Mekong Basin of Thailand. ZOOLOGY 2020; 143:125830. [PMID: 32916444 DOI: 10.1016/j.zool.2020.125830] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 07/16/2020] [Accepted: 07/22/2020] [Indexed: 11/19/2022]
Abstract
Morphological variation is fundamentally related to various aspects of fish ecology, including foraging, locomotion, and habitat utilisation. Twenty-six species of closely related cyprinid fish (n = 502) were analysed for patterns of morphological variations by using geometric morphometric methods. Ecological data of feeding and habitat preferences were determined by the observations in fields and laboratory together with the gathering of bibliographic information. The findings of major variation displayed in all parts of the fish body and correlated with ecological parameters. Variations of head shape especially form and position of mouthpart involved with feeding behaviours, whereas the variations of body depth and length which affected swimming patterns reflected responsiveness of water currents and habitat uses. Adaptation of head shape and body elongation was remarkably related to the feeding regime, swimming manoeuvrability and habitat utilisation of the species. Some convergent variation was observed between the tribes Smiliogastrini and Poropuntiini. Therefore, we propose that the morphological diversity of cyprinine fish is mainly affected by ecological gradients, while phylogenetic effects on morphology are minor.
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Affiliation(s)
- Anan Kenthao
- Department of Biology, Faculty of Science, Naresuan University, Mueang, Phitsanulok, 65000, Thailand.
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13
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Riva-Rossi C, Barrasso DA, Baker C, Quiroga AP, Baigún C, Basso NG. Revalidation of the Argentinian pouched lamprey Geotria macrostoma (Burmeister, 1868) with molecular and morphological evidence. PLoS One 2020; 15:e0233792. [PMID: 32470001 PMCID: PMC7259705 DOI: 10.1371/journal.pone.0233792] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Accepted: 05/12/2020] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND The Argentinian pouched lamprey, classified as Petromyzon macrostomus Burmeister, 1868 was first described in 1867 in De La Plata River, in Buenos Aires, Argentina, and subsequently recorded in several rivers from Patagonia. Since its original description, the validity of P. macrostomus was questioned by several ichthyologists and 36 years after its original discovery it was considered a junior synonym of Geotria australis Gray, 1851. For a long time, the taxonomic status of G. australis has been uncertain, largely due to the misinterpretations of the morphological alterations that occur during sexual maturation, including the arrangement of teeth, size and position of fins and cloaca, and the development of an exceptionally large gular pouch in males. In this study, the taxonomic status of Geotria from across the "species" range was evaluated using both molecular analysis and examination of morphological characteristics. METHODOLOGY/PRINCIPAL FINDINGS Phylogenetic and species delimitation analyses based on mitochondrial DNA sequences of Cytochrome b (Cyt b) and Cytochrome C Oxidase Subunit 1 (COI) genes, along with morphological analysis of diagnostic characters reported in the original descriptions of the species were used to assess genetic and morphological variation within Geotria and to determine the specific status of the Argentinian lamprey. These analyses revealed that Geotria from Argentina constitutes a well differentiated lineage from Chilean and Australasian populations. The position of the cloaca and the distance between the second dorsal and caudal fins in sub-adult individuals, and at previous life stages, can be used to distinguish between the two species. In addition, the genetic distance between G. macrostoma and G. australis for the COI and Cyt b mitochondrial genes is higher than both intra- and inter-specific distances reported for other Petromyzontiformes. CONCLUSIONS/SIGNIFICANCE Our results indicate that the Argentinian pouched lamprey, found along a broad latitudinal gradient on the south-west Atlantic coast of South America, should be named as Geotria macrostoma (Burmeister, 1868) and not as G. australis Gray 1851, returning to its earliest valid designation in Argentina. Geotria macrostoma can now be considered as the single lamprey species inhabiting Argentinian Patagonia, with distinct local adaptations and evolutionary potential. It is essential that this distinctiveness is recognized in order to guide future conservation and management actions against imminent threats posed by human actions in the major basins of Patagonia.
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Affiliation(s)
- Carla Riva-Rossi
- Instituto de Diversidad y Evolución Austral (IDEAus-CONICET), Puerto Madryn, Chubut, Argentina
| | - Diego Andrés Barrasso
- Instituto de Diversidad y Evolución Austral (IDEAus-CONICET), Puerto Madryn, Chubut, Argentina
- Sección Herpetología, División Zoología Vertebrados, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata (UNLP), La Plata, Buenos Aires, Argentina
| | - Cindy Baker
- National Institute of Water & Atmospheric Research Ltd (NIWA), Hamilton, New Zealand
| | - Analía Pamela Quiroga
- Instituto de Diversidad y Evolución Austral (IDEAus-CONICET), Puerto Madryn, Chubut, Argentina
| | - Claudio Baigún
- Instituto de Investigación e Ingeniería Ambiental (CONICET-UNSAM), San Martín, Buenos Aires, Argentina
| | - Néstor Guillermo Basso
- Instituto de Diversidad y Evolución Austral (IDEAus-CONICET), Puerto Madryn, Chubut, Argentina
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14
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Bronaugh WM, Swartz ER, Sidlauskas BL. Between an ocean and a high place: coastal drainage isolation generates endemic cryptic species in the Cape kurper Sandelia capensis (Anabantiformes: Anabantidae), Cape Region, South Africa. JOURNAL OF FISH BIOLOGY 2020; 96:1087-1099. [PMID: 31647570 DOI: 10.1111/jfb.14182] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 10/23/2019] [Indexed: 06/10/2023]
Abstract
This study investigated the range-wide phylogenetics and biogeography of the Cape kurper Sandelia capensis, a primary freshwater fish endemic to and widespread within the Cape Floristic Region (CFR) of South Africa. Maximum likelihood, Bayesian phylogenetic and haplotype network analyses, based on two mitochondrial and two nuclear genes, revealed the existence of three reciprocally monophyletic, deeply divergent and allopatric clades that probably represent cryptic species. The West Coast Clade is largely confined to the Langvlei, Verlorenvlei, Berg and Diep Rivers, the Klein River Clade is endemic to the Klein River and the South Coast Clade is found everywhere else in the range of S. capensis sensu lato. It was hypothesised that divergences within S. capensis sensu lato probably occurred because of isolation of coastal drainages by persistent drainage divides or vicariance of current tributaries by the drowning of their confluences by high sea levels. The current distribution of lineages could be due to historical range expansion and gene flow via river capture or some other mode of transdivide dispersal or dispersal during periods of low sea level via palaeoriver confluences of currently isolated coastal rivers. Comparison of BEAST2 estimated divergence times with the timing of climatic, geological and geomorphological events supported long-term coastal drainage isolation, punctuated by rare transdivide dispersal events and limited palaeoriver dispersal, as the best explanation of current phylogeographic and divergence patterns in S. capensis. Hydrological barriers that block upstream passage in palaeotributaries could hypothetically explain why S. capensis failed to disperse through certain palaeoriver confluences. There were several sites where biogeographic patterns have likely been confounded by human translocation of S. capensis. Alien fish predators and water extraction may threaten the three cryptic species more severely than previously realised, due to their smaller population sizes and inhabitation of only a portion of the range previously ascribed to S. capensis sensu lato. The preponderance of cryptic diversity and endemism in the CFR suggests that additional undescribed cryptic species of obligate freshwater fishes may be found in short coastal river systems around the world, especially in regions with a history of geological stability and a narrow continental shelf.
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Affiliation(s)
| | - Ernst R Swartz
- South African Institute for Aquatic Biodiversity, Grahamstown, South Africa
| | - Brian L Sidlauskas
- Oregon State University, Department of Fisheries and Wildlife, Corvallis, Oregon, USA
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15
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Magellan K. Behavioural crypsis in a South African galaxiid fish induced by predatory and non-predatory heterospecifics. JOURNAL OF FISH BIOLOGY 2020; 96:1278-1283. [PMID: 31429067 DOI: 10.1111/jfb.14127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Accepted: 08/19/2019] [Indexed: 06/10/2023]
Abstract
This study investigated recognition of, and behavioural responses to, predatory and non-predatory heterospecifics by a small cryptically coloured fish species, Galaxias 'nebula'. Nebula recognised and differentiated between predatory and non-predatory heterospecifics and altered its behaviour facultatively. With both predatory and non-predatory fishes, the proportion of time spent motionless increased, whereas refugia use was affected only by predators and neither heterospecific affected the time spent active. Although nebula appeared to face no conflict, in that their responses to predatory and non-predatory heterospecifics varied in the same direction and differed only in intensity, the presence of both heterospecifics together induced responses midway between those for each heterospecific separately. Non-predatory heterospecifics thus modified nebula's responses towards predators, potentially making time available for other essential activities such as foraging. This modified predator response may aid its survival in an increasingly threatened habitat.
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Affiliation(s)
- Kit Magellan
- South African Institute for Aquatic Biodiversity, Grahamstown, South Africa
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16
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Weyl OL, Chakona A. Journal of Fish Biology special issue on The Biology and Ecology of African Freshwater Fishes. JOURNAL OF FISH BIOLOGY 2020; 96:1075-1076. [PMID: 32420662 DOI: 10.1111/jfb.14362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Affiliation(s)
- Olaf Lf Weyl
- South African Institute for Aquatic Biodiversity, Grahamstown, South Africa
- Department of Ichthyology and Fisheries Science, Rhodes University, Grahamstown, South Africa
| | - Albert Chakona
- South African Institute for Aquatic Biodiversity, Grahamstown, South Africa
- Department of Ichthyology and Fisheries Science, Rhodes University, Grahamstown, South Africa
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17
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Thomaz AT, Knowles LL. Common barriers, but temporal dissonance: Genomic tests suggest ecological and paleo‐landscape sieves structure a coastal riverine fish community. Mol Ecol 2020; 29:783-796. [DOI: 10.1111/mec.15357] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 01/02/2020] [Accepted: 01/13/2020] [Indexed: 12/28/2022]
Affiliation(s)
- Andréa T. Thomaz
- Department of Ecology and Evolutionary Biology University of Michigan Ann Arbor MI USA
- Biodiversity Research Centre and Department of Zoology University of British Columbia Vancouver BC Canada
| | - L. Lacey Knowles
- Department of Ecology and Evolutionary Biology University of Michigan Ann Arbor MI USA
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18
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Reizenberg JL, Bloy LE, Weyl OLF, Shelton JM, Dallas HF. Variation in thermal tolerances of native freshwater fishes in South Africa's Cape Fold Ecoregion: examining the east-west gradient in species' sensitivity to climate warming. JOURNAL OF FISH BIOLOGY 2019; 94:103-112. [PMID: 30447068 DOI: 10.1111/jfb.13866] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 11/14/2018] [Indexed: 06/09/2023]
Abstract
The Cape Fold Ecoregion (CFE) is a biodiversity hotspot with high levels of endemism in its freshwater fish fauna. This study examined inter and intra-specific variation in critical thermal maxima (TCmax ) for eight native species of freshwater fish from the CFE. Cape galaxias Galaxias zebratus, Breede River redfin Pseudobarbus burchelli, Berg River redfin Pseudobarbus burgi, Clanwilliam redfin Pseudobarbus calidus and fiery redfin Pseudobarbus phlegethon were the most thermally sensitive (TCmax = 29.8-32.8°C). Clanwilliam rock-catfish Austroglanis gilli, Eastern Cape redfin Pseudobarbus afer and Cape kurper Sandelia capensis were moderately sensitive (TCmax = 33.0-36.8°C). An increase in intra-specific thermal sensitivity of S. capensis was observed from east to west. The results were related to in situ water temperature, which influenced TCmax for all species, suggesting that thermal history is a major driver of variation in thermal tolerance amongst populations. These thermal tolerance data for freshwater fishes in the CFE demonstrate that resilience to climate warming follows a geographical cline and that the more sensitive western species and regions are conservation priorities.
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Affiliation(s)
- Jody-Lee Reizenberg
- Department of Biological Science, University of Cape Town, Rondebosch, South Africa
| | - Lesley E Bloy
- Department of Ichthyology and Fisheries Science, Rhodes University, Grahamstown, South Africa
- Center for Invasion Biology, South African Institute for Aquatic Biodiversity (SAIAB), Grahamstown, South Africa
| | - Olaf L F Weyl
- Center for Invasion Biology, South African Institute for Aquatic Biodiversity (SAIAB), Grahamstown, South Africa
- DST/NRF Research Chair in Inland Fisheries and Freshwater Ecology, South African Institute for Aquatic Biodiversity (SAIAB), Grahamstown, South Africa
| | - Jeremy M Shelton
- DST/NRF Research Chair in Inland Fisheries and Freshwater Ecology, South African Institute for Aquatic Biodiversity (SAIAB), Grahamstown, South Africa
- Freshwater Research Centre, Scarborough, South Africa
| | - Helen F Dallas
- Freshwater Research Centre, Scarborough, South Africa
- Nelson Mandela University, Port Elizabeth, South Africa
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19
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Adeoba MI, Yessoufou K. Analysis of temporal diversification of African Cyprinidae (Teleostei, Cypriniformes). Zookeys 2018:141-161. [PMID: 30588160 PMCID: PMC6302146 DOI: 10.3897/zookeys.806.25844] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2018] [Accepted: 10/02/2018] [Indexed: 11/12/2022] Open
Abstract
Recent evidence that freshwater fishes diversify faster than marine fishes signifies that the evolutionary history of biodiversity in freshwater system is of particular interest. Here, the evolutionary diversification events of African Cyprinidae, a freshwater fish family with wide geographic distribution, were reconstructed and analysed. The overall diversification rate of African Cyprinidae is 0.08 species per million year (when extinction rate is very high, i.e., ε = 0.9) and 0.11 species per million year (when ε = 0). This overall rate is lower than the rate reported for African Cichlids, suggesting that African freshwaters might be less conducive for a rapid diversification of Cyprinidae. However, the observed diversification events of African Cyprinidae occurred in the last 10 million years. The temporal pattern of these events follows a non-constant episodic birth-death model (Bayes Factor > 28) and the rate-constant model never outperformed any of the non-constant models tested. The fact that most diversification events occurred in the last 10 million years supports the pattern reported for Cyprinidae in other continent, e.g., Asia, perhaps pointing to concomitant diversification globally. However, the diversification events coincided with major geologic and paleo-climatic events in Africa, suggesting that geological and climatic events may have mediated the diversification patterns of Cyprinidae on the continent.
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Affiliation(s)
- Mariam I Adeoba
- Department of Zoology, University of Johannesburg, Kingsway Campus PO Box 524, Auckland Park 2006, South Africa University of Johannesburg Johannesburg South Africa
| | - Kowiyou Yessoufou
- Department of Geography, Environmental management and Energy studies, University of Johannesburg, Kingsway Campus PO Box 524, Auckland Park 2006, South Africa University of Johannesburg Johannesburg South Africa
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20
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Wood LE, de Grave S, Daniels SR. A comparative evolutionary study reveals radically different scales of genetic structuring within two atyid shrimp species (Crustacea: Decapoda: Atyidae). Zool J Linn Soc 2018. [DOI: 10.1093/zoolinnean/zly044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Louisa E Wood
- Department of Botany and Zoology, University of Stellenbosch, Private Bag X1, Matieland, South Africa
| | - Sammy de Grave
- Oxford University Museum of Natural History, Parks Road, Oxford, UK
| | - Savel R Daniels
- Department of Botany and Zoology, University of Stellenbosch, Private Bag X1, Matieland, South Africa
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21
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Chakona A, Kadye WT, Bere T, Mazungula DN, Vreven E. Evidence of hidden diversity and taxonomic conflicts in five stream fishes from the Eastern Zimbabwe Highlands freshwater ecoregion. Zookeys 2018:69-95. [PMID: 29955212 PMCID: PMC6019476 DOI: 10.3897/zookeys.768.21944] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Accepted: 04/25/2018] [Indexed: 11/25/2022] Open
Abstract
Stream fishes of the Eastern Afromontane region are among the least studied vertebrates in this region, despite the potential for harbouring cryptic diversity. The present study examined mitochondrial cytochrome oxidase subunit I (COI) sequence divergence in 153 specimens of stream fishes belonging to four genera and three families, [(Amphilius and Zaireichthys (Amphiliidae); Chiloglanis (Mochokidae); and Hippopotamyrus (Mormyridae)], in the Eastern Zimbabwe Highlands (EZH) freshwater ecoregion to explore the extent to which the current taxonomy conceals the ichthyofaunal diversity in the region. The General Mixed Yule Coalescent (GMYC) species delineation method identified 14 clusters within five currently recognised ‘species’ from the EZH ecoregion. Only one of these clusters represents a named species, while 13 of them represent candidate or undescribed species. Our results revealed that effective conservation of this region’s unique biota is limited by the incomplete knowledge of taxonomic diversity and inaccurate mapping of species distribution ranges.
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Affiliation(s)
- Albert Chakona
- South African Institute for Aquatic Biodiversity, Private Bag 1015, Grahamstown, South Africa, 6140.,Department of Ichthyology and Fisheries Science, Rhodes University, P.O. Box 94, Grahamstown, South Africa, 6140
| | - Wilbert T Kadye
- Department of Ichthyology and Fisheries Science, Rhodes University, P.O. Box 94, Grahamstown, South Africa, 6140
| | - Taurai Bere
- School of Wildlife, Ecology and Conservation, Chinhoyi University of Technology, P. Bag 7724, Chinhoyi, Zimbabwe
| | - Daniel N Mazungula
- South African Institute for Aquatic Biodiversity, Private Bag 1015, Grahamstown, South Africa, 6140.,Department of Ichthyology and Fisheries Science, Rhodes University, P.O. Box 94, Grahamstown, South Africa, 6140
| | - Emmanuel Vreven
- Royal Museum for Central Africa, Section of Vertebrates, Ichthyology, Leuvensesteenweg 13, 3080, Tervuren, Belgium.,KU Leuven, Department of Biology, Laboratory of Biodiversity and Evolutionary Genomics, Deberiotstraat 32, 3000 Leuven, Belgium
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22
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Stobie CS, Oosthuizen CJ, Cunningham MJ, Bloomer P. Exploring the phylogeography of a hexaploid freshwater fish by RAD sequencing. Ecol Evol 2018; 8:2326-2342. [PMID: 29468047 PMCID: PMC5817159 DOI: 10.1002/ece3.3821] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Accepted: 12/17/2017] [Indexed: 12/12/2022] Open
Abstract
The KwaZulu‐Natal yellowfish (Labeobarbus natalensis) is an abundant cyprinid, endemic to KwaZulu‐Natal Province, South Africa. In this study, we developed a single‐nucleotide polymorphism (SNP) dataset from double‐digest restriction site‐associated DNA (ddRAD) sequencing of samples across the distribution. We addressed several hidden challenges, primarily focusing on proper filtering of RAD data and selecting optimal parameters for data processing in polyploid lineages. We used the resulting high‐quality SNP dataset to investigate the population genetic structure of L. natalensis. A small number of mitochondrial markers present in these data had disproportionate influence on the recovered genetic structure. The presence of singleton SNPs also confounded genetic structure. We found a well‐supported division into northern and southern lineages, with further subdivision into five populations, one of which reflects north–south admixture. Approximate Bayesian Computation scenario testing supported a scenario where an ancestral population diverged into northern and southern lineages, which then diverged to yield the current five populations. All river systems showed similar levels of genetic diversity, which appears unrelated to drainage system size. Nucleotide diversity was highest in the smallest river system, the Mbokodweni, which, together with adjacent small coastal systems, should be considered as a key catchment for conservation.
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Affiliation(s)
- Cora Sabriel Stobie
- Molecular Ecology and Evolution Programme Department of Genetics University of Pretoria Pretoria South Africa
| | - Carel J Oosthuizen
- Molecular Ecology and Evolution Programme Department of Genetics University of Pretoria Pretoria South Africa
| | - Michael J Cunningham
- Molecular Ecology and Evolution Programme Department of Genetics University of Pretoria Pretoria South Africa
| | - Paulette Bloomer
- Molecular Ecology and Evolution Programme Department of Genetics University of Pretoria Pretoria South Africa
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23
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Genomic signatures of paleodrainages in a freshwater fish along the southeastern coast of Brazil: genetic structure reflects past riverine properties. Heredity (Edinb) 2017; 119:287-294. [PMID: 28767104 DOI: 10.1038/hdy.2017.46] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 06/22/2017] [Accepted: 06/23/2017] [Indexed: 12/12/2022] Open
Abstract
Past shifts in connectivity in riverine environments (for example, sea-level changes) and the properties of current drainages can act as drivers of genetic structure and demographic processes in riverine population of fishes. However, it is unclear whether the same river properties that structure variation on recent timescales will also leave similar genomic signatures that reflect paleodrainage properties. By characterizing genetic structure in a freshwater fish species (Hollandichthys multifasciatus) from a system of basins along the Atlantic coast of Brazil we test for the effects of paleodrainages caused by sea-level changes during the Pleistocene. Given that the paleodrainage properties differ along the Brazilian coast, we also evaluate whether estimated genetic diversity within paleodrainages can be explained by past riverine properties (i.e., area and number of rivers in a paleodrainage). Our results demonstrate that genetic structure between populations is not just highly concordant with paleodrainages, but that differences in the genetic diversity among paleodrainages correspond to the joint effect of differences in the area encompassed by, and the number of rivers, within a paleodrainage. Our findings extend the influence of current riverine properties on genetic diversity to those associated with past paleodrainage properties. We discuss how these findings may explain the inconsistent support for paleodrainages in structuring divergence from different global regions and the importance of taking into account past conditions for understanding the high species diversity of freshwater fish that we currently observe in the world, and especially in the Neotropics.
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24
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Chakona A, Skelton PH. A review of the Pseudobarbus afer (Peters, 1864) species complex (Teleostei, Cyprinidae) in the eastern Cape Fold Ecoregion of South Africa. Zookeys 2017:109-140. [PMID: 28331412 PMCID: PMC5345373 DOI: 10.3897/zookeys.657.11076] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2016] [Accepted: 02/09/2017] [Indexed: 11/12/2022] Open
Abstract
The Eastern Cape redfin, Pseudobarbus afer, has long been considered to be a single widespread and variable species occurring in multiple isolated river systems in the Cape Fold Ecoregion (CFE) at the southern tip of Africa. Mitochondrial cytochrome b and control region sequence data of individuals from populations currently assigned to Pseudobarbus afer across the species' distribution range revealed existence of four deeply divergent taxonomic units: (i) the Mandela lineage confined to the Sundays, Swartkops and Baakens river systems, (ii) the Krom lineage endemic to the Krom River system, (iii) the St Francis lineage occurring in the Gamtoos and adjacent river systems, and (iv) the Forest lineage occurring in several coastal river systems from the Tsitsikamma to the Klein Brak River system. The Forest lineage is closely related to Pseudobarbus phlegethon from the Olifants River system on the west coast of South Africa, suggesting that it does not belong to Pseudobarbus afer s.l. Herein we focus on the three lineages within the Pseudobarbus afer s.l. complex and provide new diagnosis for Pseudobarbus afer s.s (Mandela lineage), revalidate Pseudobarbus senticeps (Krom lineage) as a distinct species, and describe a new species Pseudobarbus swartzi (St Francis lineage). The three species exhibit subtle differences, which explains why they were previously considered to represent a single variable and widespread species. Pseudobarbus senticeps differs from both Pseudobarbus afer and Pseudobarbus swartzi by having fewer (i.e. larger) scales (25-33, mode 29 lateral line scale series; 10-12, mode 11 circumpeduncular scales) and presence of a lateral stripe which terminates in a conspicuous triangular blotch at the base of the caudal fin. Long barbels which reach or surpass the vertical through the posterior edge of the eye further separate Pseudobarbus senticeps from Pseudobarbus afer s.s. which possesses simple short barbels which do not reach the vertical through the posterior margin of the eye. Pseudobarbus afer s.s differs from Pseudobarbus swartzisp. n. by possession of fewer scale rows along the lateral line (29-35, mode 32 vs 34-37, mode 36 in Pseudobarbus swartzi), fewer scales around the caudal peduncle (12-16, mode 12 vs 13-17, mode 16 in Pseudobarbus swartzi) and a distinct mesh or net-like pigmentation pattern on latero-ventral scales.
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Affiliation(s)
- Albert Chakona
- South African Institute for Aquatic Biodiversity, Private Bag 1015, Grahamstown 6140, South Africa
| | - Paul H Skelton
- South African Institute for Aquatic Biodiversity, Private Bag 1015, Grahamstown 6140, South Africa
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25
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Kadye WT, Chakona A, Jordaan MS. Swimming with the giant: coexistence patterns of a new redfin minnow Pseudobarbus skeltoni from a global biodiversity hot spot. Ecol Evol 2016; 6:7141-7155. [PMID: 28725388 PMCID: PMC5513240 DOI: 10.1002/ece3.2328] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2016] [Revised: 06/20/2016] [Accepted: 06/24/2016] [Indexed: 11/12/2022] Open
Abstract
Ecological niche theory predicts that coexistence is facilitated by resource partitioning mechanisms that are influenced by abiotic and biotic interactions. Alternative hypotheses suggest that under certain conditions, species may become phenotypically similar and functionally equivalent, which invokes the possibility of other mechanisms, such as habitat filtering processes. To test these hypotheses, we examined the coexistence of the giant redfin Pseudobarbus skeltoni, a newly described freshwater fish, together with its congener Pseudobabus burchelli and an anabantid Sandelia capensis by assessing their scenopoetic and bionomic patterns. We found high habitat and isotope niche overlaps between the two redfins, rendering niche partitioning a less plausible sole mechanism that drives their coexistence. By comparison, environment–trait relationships revealed differences in species–environment relationships, making habitat filtering and functional equivalence less likely alternatives. Based on P. skeltoni's high habitat niche overlap with other species, and its large isotope niche width, we inferred the likelihood of differential resource utilization at trophic level as an alternative mechanism that distinguished it from its congener. In comparison, its congener P. burchelli appeared to have a relatively small trophic niche, suggesting that its trophic niche was more conserved despite being the most abundant species. By contrast, S. capensis was distinguished by occupying a higher trophic position and by having a trophic niche that had a low probability of overlapping onto those of redfins. Therefore, trophic niche partitioning appeared to influence the coexistence between S. capensis and redfins. This study suggests that coexistence of these fishes appears to be promoted by their differences in niche adaptation mechanisms that are probably shaped by historic evolutionary and ecological processes.
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Affiliation(s)
- Wilbert T Kadye
- Department of Ichthyology and Fisheries Science Rhodes University P.O. Box 94 Grahamstown 6140 South Africa
| | - Albert Chakona
- South African Institute for Aquatic Biodiversity Private Bag 1015 Grahamstown 6140 South Africa
| | - Martine S Jordaan
- South African Institute for Aquatic Biodiversity Private Bag 1015 Grahamstown 6140 South Africa.,Cape Nature Scientific Services Private Bag X5014 Stellenbosch 7599 South Africa
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Chakona A, Malherbe WS, Gouws G, Swartz ER. Deep genetic divergence between geographically isolated populations of the goldie barb (Barbus pallidus) in South Africa: potential taxonomic and conservation implications. AFRICAN ZOOLOGY 2015. [DOI: 10.1080/15627020.2015.1021164] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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27
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Chakona G, Swartz ER, Chakona A. Historical abiotic events or human-aided dispersal: inferring the evolutionary history of a newly discovered galaxiid fish. Ecol Evol 2015; 5:1369-80. [PMID: 25897377 PMCID: PMC4395167 DOI: 10.1002/ece3.1409] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Revised: 12/05/2014] [Accepted: 12/12/2014] [Indexed: 12/03/2022] Open
Abstract
Range expansion of obligate freshwater fishes in the Cape Floristic Region (CFR) of South Africa has mostly been attributed to river capture events and confluence of rivers following sea-level regression. The role of low drainage divides and interbasin water transfers has received less attention. This study analyzed mitochondrial and nuclear DNA sequences to assess the processes that could have influenced the phylogeographic patterns of a newly discovered lineage of Galaxias zebratus (hereafter Galaxias zebratus "Joubertina") that occurs across two currently isolated river systems close to the Joubertina area in the eastern CFR. Results from both analyses revealed that observed genetic differentiation cannot be explained by isolation between the two river systems. No genetic differentiation was found between the Krom River system and a population from one of the Gamtoos tributaries. Shallow genetic differentiation was found between the Krom and the other Gamtoos populations. Historical river capture events and sea-level changes do not explain the present distribution of Galaxias zebratus "Joubertina" across the Krom and Gamtoos River systems. Interbasin dispersal during pluvial periods, recent river capture, or recent human-mediated translocation seems to be the most plausible explanations.
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Affiliation(s)
- Gamuchirai Chakona
- Department of Ichthyology and Fisheries Science, Rhodes UniversityP. O. Box 94, Grahamstown, 6140, South Africa
- South African Institute for Aquatic BiodiversityPrivate Bag 1015, Grahamstown, 6140, South Africa
| | - Ernst R Swartz
- South African Institute for Aquatic BiodiversityPrivate Bag 1015, Grahamstown, 6140, South Africa
| | - Albert Chakona
- South African Institute for Aquatic BiodiversityPrivate Bag 1015, Grahamstown, 6140, South Africa
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28
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Egge JJD, Hagbo TJ. Comparative phylogeography of Mississippi embayment fishes. PLoS One 2015; 10:e0116719. [PMID: 25826456 PMCID: PMC4380359 DOI: 10.1371/journal.pone.0116719] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Accepted: 12/13/2014] [Indexed: 11/17/2022] Open
Abstract
The Mississippi Embayment is a prominent physiographic feature of eastern North America consisting of primarily lowland aquatic habitats and a fish fauna that is largely distinct from nearby highland regions. Numerous studies have demonstrated that both pre-Pleistocene and Pleistocene events have had a strong influence on the distributions and relationships of highland fishes in eastern North America. However, the extent to which these same events affected Embayment distributed taxa remains largely unexplored. The purpose of this study was to investigate the relative roles of pre-Pleistocene and Pleistocene events in shaping phylogeographic relationships of four stream dwelling fishes in the Mississippi Embayment. Molecular genetic analyses of the mitochondrial gene cytochrome b were performed for three ictalurid catfish species (Noturus miurus, n = 67; Noturus hildebrandi, n = 93, and Noturus phaeus, n = 44) and one minnow species (Cyprinella camura, n = 78), all distributed in tributary streams of the Mississippi Embayment. Phylogenetic relationships and divergence times among haplotypes for each species were estimated using maximum likelihood and Bayesian methods. Phylogenetic analyses recovered 6 major haplotype clades within N. miurus, 5 within N. hildbrandi, 8 within N. phaeus, and 8 within C. camura. All three Noturus species show a high degree of isolation by drainage, which is less evident in C. camura. A clade of haplotypes from tributaries in the southern portion of the Mississippi Embayment was consistently recovered in all four species. Divergence times among clades spanned the Pleistocene, Pliocene, and Miocene. Novel relationships presented here for C. camura and N. phaeus suggest the potential for cryptic species. Pre-Pleistocene and Pleistocene era sea level fluctuations coincide with some divergence events, but no single event explains any common divergence across all taxa. Like their highland relatives, a combination of both pre-Pleistocene and Pleistocene era events have driven divergences among Embayment lineages.
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Affiliation(s)
- Jacob J. D. Egge
- Department of Biology, Pacific Lutheran University, Tacoma, Washington, United States of America
| | - Taylor J. Hagbo
- Department of Biology, Pacific Lutheran University, Tacoma, Washington, United States of America
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Chakona A, Swartz ER, Skelton PH. A new species of redfin (Teleostei, Cyprinidae, Pseudobarbus) from the Verlorenvlei River system, South Africa. Zookeys 2014:121-37. [PMID: 25493062 PMCID: PMC4258629 DOI: 10.3897/zookeys.453.8072] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Accepted: 09/30/2014] [Indexed: 11/18/2022] Open
Abstract
Pseudobarbusverloreni, a new species, is described from material collected in the Verlorenvlei River system on the west coast of South Africa. It differs from its congeners (except Pseudobarbusskeltoni, Pseudobarbusburchelli, and Pseudobarbusburgi) by the presence of two pairs of oral barbels. Pseudobarbusverlorenisp. n. can be distinguished from the three currently described double barbeled Pseudobarbus species by the following combination of characters: pigment pattern, generally deeper body relative to standard length, a longer intestine associated with the deeper body form, shorter snout relative to head length, and much shorter anterior barbels relative to head length. The new species is distinguished from Pseudobarbusburgi in the neighbouring Berg River system by its longer head and longer pre-dorsal length. It seems as if Pseudobarbusverlorenisp. n. has been extirpated from the Langvlei River system and face several threats to its survival in the Verlorenvlei River system.
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Affiliation(s)
- Albert Chakona
- South African Institute for Aquatic Biodiversity, Private Bag 1015, Grahamstown 6140, South Africa
| | - Ernst R Swartz
- South African Institute for Aquatic Biodiversity, Private Bag 1015, Grahamstown 6140, South Africa
| | - Paul H Skelton
- South African Institute for Aquatic Biodiversity, Private Bag 1015, Grahamstown 6140, South Africa
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Dias MS, Oberdorff T, Hugueny B, Leprieur F, Jézéquel C, Cornu JF, Brosse S, Grenouillet G, Tedesco PA. Global imprint of historical connectivity on freshwater fish biodiversity. Ecol Lett 2014; 17:1130-40. [PMID: 25039890 DOI: 10.1111/ele.12319] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Revised: 03/27/2014] [Accepted: 05/28/2014] [Indexed: 11/29/2022]
Abstract
The relative importance of contemporary and historical processes is central for understanding biodiversity patterns. While several studies show that past conditions can partly explain the current biodiversity patterns, the role of history remains elusive. We reconstructed palaeo-drainage basins under lower sea level conditions (Last Glacial Maximum) to test whether the historical connectivity between basins left an imprint on the global patterns of freshwater fish biodiversity. After controlling for contemporary and past environmental conditions, we found that palaeo-connected basins displayed greater species richness but lower levels of endemism and beta diversity than did palaeo-disconnected basins. Palaeo-connected basins exhibited shallower distance decay of compositional similarity, suggesting that palaeo-river connections favoured the exchange of fish species. Finally, we found that a longer period of palaeo-connection resulted in lower levels of beta diversity. These findings reveal the first unambiguous results of the role played by history in explaining the global contemporary patterns of biodiversity.
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Affiliation(s)
- Murilo S Dias
- UMR Biologie des ORganismes et des Ecosystèmes Aquatiques, UMR BOREA, IRD 207-CNRS 7208-UPMC-MNHN, Muséum national d'histoire naturelle, 43 rue Cuvier, FR-75231, Paris cedex, France
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Muñoz-Ramírez CP, Unmack PJ, Habit E, Johnson JB, Cussac VE, Victoriano P. Phylogeography of the ancient catfish family Diplomystidae: biogeographic, systematic, and conservation implications. Mol Phylogenet Evol 2014; 73:146-60. [PMID: 24486990 DOI: 10.1016/j.ympev.2014.01.015] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 01/05/2014] [Accepted: 01/17/2014] [Indexed: 10/25/2022]
Abstract
The catfish family Diplomystidae is one of the earliest branching lineages within the diverse order Siluriformes and shows a deep phylogenetic split from all other extant and extinct major catfish groups. Despite its relevance in the evolution of siluriforms, phylogenetic relationships within the Diplomystidae are poorly understood, and prior to this study, no phylogenetic hypotheses using molecular data had been published. By conducting a phylogeographic study across the entire distribution of the family, that encompasses river systems from Central-South Chile and Argentina, we provide the first molecular phylogenetic hypothesis among all known species of Diplomystidae, and in addition, investigate how their evolutionary history relates to major historical events that took place in southern South America. Our phylogenetic analyses show four main lineages and nine sub-lineages strongly structured geographically. All Pacific basin populations, with one exception (those found in the Baker basin) clustered within three of the four main lineages (clades I-III), while all populations from Atlantic basins and those from the Baker basin clustered in a single main clade (clade IV). There was a tendency for genetic diversity to decrease from north to south for Pacific basins consistent with an increasing north-south ice coverage during the last glacial maximum. However, we did not find a statistically significant correlation between genetic diversity and latitude. Analysis of molecular variance (AMOVA) showed that river basins and the barrier created by the Andes Mountains explained a high percentage of the genetic variation. Interestingly, most of the genetic variation among drainages was explained among Pacific basins. Molecular phylogenetic analyses agree only partially with current systematics. The geographical distribution of main lineages did not match species distribution and suggests a new taxonomic hypothesis with support for four species of Diplomystes, three species distributed allopatrically from the Rapel to the Valdivia basin, and only one species distributed in Baker and Atlantic basins. High genetic differentiation among river basins suggests that conservation efforts should focus on protecting populations in each basin in order to preserve the genetic diversity of one of the oldest groups of catfishes on the earth today.
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Affiliation(s)
- C P Muñoz-Ramírez
- Departamento de Zoología, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Casilla 160-C, Concepción, Chile.
| | - P J Unmack
- Department of Biology and Monte L. Bean Life Science Museum, Brigham Young University, Provo, UT 84602, USA
| | - E Habit
- Facultad de Ciencias Ambientales y Centro EULA-Chile, Universidad de Concepción, Chile; Centro de Investigación en Ecosistemas Patagónicos (CIEP), Coyhaique, Chile
| | - J B Johnson
- Department of Biology and Monte L. Bean Life Science Museum, Brigham Young University, Provo, UT 84602, USA
| | - V E Cussac
- Instituto de Investigaciones en Biodiversidad y Medio Ambiente, Universidad Nacional del Comahue-CONICET, Bariloche, 8400 Rio Negro, Argentina
| | - P Victoriano
- Departamento de Zoología, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Casilla 160-C, Concepción, Chile; Centro de Investigación en Ecosistemas Patagónicos (CIEP), Coyhaique, Chile
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