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Astorga MP, Valenzuela A, Segovia NI, Poulin E, Vargas-Chacoff L, González-Wevar CA. Contrasting Patterns of Genetic Diversity and Divergence Between Landlocked and Migratory Populations of Fish Galaxias maculatus, Evaluated Through Mitochondrial DNA Sequencing and Nuclear DNA Microsatellites. Front Genet 2022; 13:854362. [PMID: 35664323 PMCID: PMC9161745 DOI: 10.3389/fgene.2022.854362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 04/08/2022] [Indexed: 11/13/2022] Open
Abstract
Galaxias species are interesting biogeographic models due to their distribution and different types of life cycles, with migratory and landlocked populations. To obtain a better understanding of the genetic consequences of the Quaternary glacial cycles in Galaxias maculatus, in this work we compared landlocked and migratory populations collected in areas that were differentially affected by ice advances and retreats. We included nine populations of G. maculatus, four collected from lakes (landlocked) and five from their associated estuaries/rivers (migratory) in three estuary-lake systems across southern Chile. Genetic analyses were performed using the mitochondrial control region and nine microsatellite loci. Genetic diversity measured with both markers was significantly higher in migratory than in landlocked populations across the study area. The levels of genetic differentiation showed higher differentiation among lakes than estuaries. Genetic diversity was higher in migratory populations located in areas that were less impacted by ice during Quaternary glacial processes. These results may be the consequence of recent recolonization of small freshwater bodies following the Last Glacial Maximum (LGM). Finally, the greatest differentiation was observed in populations that were exposed to continental ice advances and retreats during the LGM. Thus, in the present work we corroborate a pattern of differentiation between lakes and estuaries, using mtDNA sequences and microsatellite nuclear markers. This pattern may be due to a combination of biological factors, i.e., resident non-migratory behaviour or landlocking and natal homing-in, as well as geological factors, i.e., Expansion-Contraction Quaternary glacial biogeographic processes.
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Affiliation(s)
- Marcela P. Astorga
- Instituto de Acuicultura, Universidad Austral de Chile, Puerto Montt, Chile
| | - Andrea Valenzuela
- Instituto de Acuicultura, Universidad Austral de Chile, Puerto Montt, Chile
| | - Nicolás I. Segovia
- Departamento de Biología Marina, Facultad de Ciencias del Mar, Universidad Católica Del Norte, Coquimbo, Chile
- Instituto Milenio Biodiversidad de Ecosistemas Antárticos y Sub-Antárticos (BASE), Santiago, Chile
| | - Elie Poulin
- Instituto Milenio Biodiversidad de Ecosistemas Antárticos y Sub-Antárticos (BASE), Santiago, Chile
- Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Luis Vargas-Chacoff
- Instituto Milenio Biodiversidad de Ecosistemas Antárticos y Sub-Antárticos (BASE), Santiago, Chile
- Instituto de Ciencias Marinas y Limnológicas (ICML), Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
- Centro FONDAP de Investigaciones en Dinámica de Ecosistemas Marinos de Altas Latitudes (IDEAL), Universidad Austral de Chile, Valdivia, Chile
| | - Claudio A. González-Wevar
- Instituto Milenio Biodiversidad de Ecosistemas Antárticos y Sub-Antárticos (BASE), Santiago, Chile
- Instituto de Ciencias Marinas y Limnológicas (ICML), Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
- Centro FONDAP de Investigaciones en Dinámica de Ecosistemas Marinos de Altas Latitudes (IDEAL), Universidad Austral de Chile, Valdivia, Chile
- *Correspondence: Claudio A. González-Wevar,
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Taxonomic and Functional Responses of Species-Poor Riverine Fish Assemblages to the Interplay of Human-Induced Stressors. WATER 2022. [DOI: 10.3390/w14030355] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The effects of human-induced stressors on riverine fish assemblages are still poorly understood, especially in species-poor assemblages such as those of temperate South American rivers. In this study we evaluated the effects of human-induced stressors on the taxonomic and functional facets of fish assemblages of two central-southern Chilean rivers: the Biobío River (flow regulated by multiple dams) and the Valdivia River (free-flowing). The study design considered reference condition, urban polluted, and urban-industrial polluted sites. To evaluate the effects of stressors on fish assemblages we assessed: (i) components of beta diversity; (ii) spatial and temporal patterns of fish structure using a multivariate approach; and (iii) functional diversity (specialization, originality, dispersion, and entropy) using linear models. We found a strong association between taxonomic and functional fish assemblage facets with a predominance of natural processes in the Valdivia River reflected in marked temporal dynamics. In contrast, the Biobío River showed a clear loss of association with seasonal pattern, and both taxonomic and functional facets appeared to respond significantly to pollution zones. Implementation of stricter environmental policies and integrated river basin management are instrumental for conserving species-poor fish assemblages in Chilean temperate rivers characterized by low functional traits redundancy.
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Diversity and Host Relationships of the Mycoparasite Sepedonium (Hypocreales, Ascomycota) in Temperate Central Chile. Microorganisms 2021; 9:microorganisms9112261. [PMID: 34835387 PMCID: PMC8624339 DOI: 10.3390/microorganisms9112261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 10/12/2021] [Accepted: 10/20/2021] [Indexed: 12/02/2022] Open
Abstract
We present the first major survey of regional diversity, distribution and host-association of Sepedonium. Whereas the rather scarce worldwide records of this mycoparasitic fungus suggested no specific distribution pattern of most species before, we provide new evidence of endemic and specific host-parasite guilds of Sepedonium in Southern South America, including the description of a new species. The corresponding inventory was performed in temperate central Chile. The regional landscape, a mosaic of exotic timber plantations and remnants of native Nothofagus forests, facilitates a unique combination of endemic and adventitious Boletales hosts. During a two-year survey, 35 Sepedonium strains were isolated and cultured from infected basidiomata of allochthonous Chalciporus piperatus, Paxillus involutus, Rhizopogon spp. and Suillus spp., as well as from the native Boletus loyita, B. loyo, B. putidus and Gastroboletus valdivianus. Taxonomic diagnosis included morphology of conidia and conidiophores, sequences of ITS, RPB2 and EF1 molecular markers and characteristics of in vitro cultures. Phylogenetic reconstructions were performed using Bayesian methods. Four Sepedonium species could be identified and characterized, viz.: S. ampullosporum, S. chrysospermum, S. laevigatum and the newly described species S. loyorum. The most frequent species on introduced Boletales was S. ampullosporum, followed by S. chrysospermum and S. laevigatum. S. loyorum sp. nov. was found exclusively on native boletacean hosts, separated from its closest relative S. chalcipori by micromorphological and molecular attributes. Species descriptions and identification keys are provided. Ecological and biogeographical aspects of endemic and allochthonous symbiotic units consisting of mycoparasite, ectomycorrhizal fungal host and respective mycorrhizal tree are discussed.
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Valenzuela-Aguayo F, McCracken GR, Diaz G, Manosalva A, Habit E, Ruzzante DE. Connectivity, diversity, and hybridization between two endemic fish species (Percilia spp.) in a complex temperate landscape. CONSERV GENET 2021. [DOI: 10.1007/s10592-021-01400-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Fuentes N, Marticorena A, Saldaña A, Jerez V, Ortiz JC, Victoriano P, Moreno RA, Larraín J, Villaseñor-Parada C, Palfner G, Sánchez P, Pauchard A. Multi-taxa inventory of naturalized species in Chile. NEOBIOTA 2020. [DOI: 10.3897/neobiota.60.55366] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Here we present a multi-taxa inventory of naturalized alien species recorded on continental Chile and adjacent marine habitats, including eight taxonomic groups. We identified 1,122 species. These comprise 790 vascular plants (terrestrial and aquatic); 31 nonvascular plants [Bryophyta (mosses), Marchantiophyta (liverworts) and Anthocerotophyta (hornworts)]; 18 marine and freshwater macro and micro algae; 71 fungi; 39 terrestrial vertebrates (amphibians, reptiles, mammals and birds); 108 insects; 37 marine and freshwater invertebrates and vertebrates (6 polychaetes, 3 mollusks and 28 Pisces); and 28 terrestrial gastropods. For all taxonomic groups, naturalized species were found to mainly be distributed in regions with Mediterranean and temperate climates, with few at either extreme of the country. The invasion curves show that naturalized species first underwent a positive increment, followed by an apparent plateau phase, mainly in vascular plants, insects and vertebrates. In fungi, marine and freshwater macro and microalgae, vertebrates and invertebrates, the cumulative number of naturalized species increased sharply starting in the early 20th century; the lack of collections before 1900 is also evident. When considering naturalized species as a whole, this inventory highlights that the rate of new naturalizations consistently increased after 1950, especially for some taxonomic groups such as insects, fungi, and vascular plants. This multi-taxa inventory of naturalized species provides a platform for national reporting on biodiversity indicators and highlights areas where Chile must invest resources to manage biological invasions.
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Victoriano PF, Muñoz-Ramírez CP, Canales-Aguirre CB, Jara A, Vera-Escalona I, Burgos-Careaga T, Muñoz-Mendoza C, Habit EM. Contrasting evolutionary responses in two co-distributed species of Galaxias (Pisces, Galaxiidae) in a river from the glaciated range in Southern Chile. ROYAL SOCIETY OPEN SCIENCE 2020; 7:200632. [PMID: 32874654 PMCID: PMC7428232 DOI: 10.1098/rsos.200632] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Accepted: 06/10/2020] [Indexed: 05/05/2023]
Abstract
Life-history traits are among the most important factors affecting population abundance and genetic diversity of species. Here, we analysed the genetic patterns of two Galaxias species with different life-history traits to investigate how these biological differences impacted their evolution in the Valdivia River basin, Southern Chile. We analysed mitochondrial DNA (mtDNA) sequences from 225 individuals of Galaxias maculatus and 136 of G. platei to compare patterns of genetic diversity, structure and demographic growth across the basin. Galaxias maculatus presented higher genetic diversity and higher genetic structure than G. platei. Demographic analyses showed G. maculatus kept a higher population size over time, with a signal of demographic expansion in the last 250 kyr. Whereas Galaxias platei, exhibited lower, but constant population size over time. Furthermore, haplotype networks revealed higher lineage diversity in G. maculatus with a tendency to occupy different areas of the basin. Coalescent simulations ruled out that genetic differences between species could be explained by stochastic processes (genetic drift), suggesting species-specific biological differences as responsible for the observed genetic differences. We discuss how differences in life-history traits and past glaciations interact to shape the evolutionary history of the two Galaxias species.
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Affiliation(s)
- P. F. Victoriano
- Departamento de Zoología, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción, Chile
- Authors for correspondence: P. F. Victoriano e-mail:
| | - C. P. Muñoz-Ramírez
- Instituto de Entomología, Universidad Metropolitana de Ciencias de la Educación, Santiago, Chile
- Departamento de Ecología, Facultad de Ciencias, Universidad Católica de la Santísima Concepción, Concepción, Chile
- Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Universidad Católica de la Santísima Concepción, Concepción, Chile
- Authors for correspondence: C. P. Muñoz-Ramírez e-mail:
| | - C. B. Canales-Aguirre
- Centro i∼mar, Universidad de Los Lagos, Camino Chinquihue Km 7, Puerto Montt, Chile
- Núcleo Milenio de Salmónidos Invasores (INVASAL), Concepción, Chile
| | - A. Jara
- Núcleo Milenio de Salmónidos Invasores (INVASAL), Concepción, Chile
| | - I. Vera-Escalona
- Departamento de Ecología, Facultad de Ciencias, Universidad Católica de la Santísima Concepción, Concepción, Chile
- Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Universidad Católica de la Santísima Concepción, Concepción, Chile
| | - T. Burgos-Careaga
- Departamento de Zoología, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción, Chile
| | - C. Muñoz-Mendoza
- Núcleo Milenio de Salmónidos Invasores (INVASAL), Concepción, Chile
| | - E. M. Habit
- Unidad de Sistemas Acuáticos, Centro de Ciencias Ambientales Eula-Chile, Universidad de Concepción, Concepcion, Chile
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New Insights into the Distribution, Physiology and Life Histories of South American Galaxiid Fishes, and Potential Threats to This Unique Fauna. DIVERSITY 2020. [DOI: 10.3390/d12050178] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
South American galaxiids occupy both Patagonia and the ichthyogeographic Chilean Province, encompassing glacial Andean deep lakes, shallow plateau lakes, reservoirs, short Pacific rivers and long Atlantic rivers. The total fish fauna includes 29 species, comprising Neotropical fishes (siluriforms and characids), galaxiids, percichthyids, atherinopsids and mugilids, two lamprey species, and several exotic fishes (salmonids, Gambusia spp. and common carp). The family Galaxiidae shares a common ancestry with the Gondwanan temperate fish fauna, played a major role in the post-glacial colonization of Andean lakes and streams, and contributes key species to the food webs. Galaxiid species occupy an enormous latitudinal gradient, show a wide variety of life history patterns and are the southernmost native freshwater fishes of the world. Knowledge of South American galaxiids has improved notably, but new challenges arise due to climate change, biological invasions, damming, aquaculture and contamination. In this changing environment, the future of South American galaxiids should be carefully considered as a legacy of the old Gondwana and a unique attribute of the freshwaters of southern South America.
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Valenzuela‐Aguayo F, McCracken GR, Manosalva A, Habit E, Ruzzante DE. Human-induced habitat fragmentation effects on connectivity, diversity, and population persistence of an endemic fish, Percilia irwini, in the Biobío River basin (Chile). Evol Appl 2020; 13:794-807. [PMID: 32211068 PMCID: PMC7086057 DOI: 10.1111/eva.12901] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 10/14/2019] [Accepted: 11/05/2019] [Indexed: 01/15/2023] Open
Abstract
An understanding of how genetic variability is distributed in space is fundamental for the conservation and maintenance of diversity in spatially fragmented and vulnerable populations. While fragmentation can occur from natural barriers, it can also be exacerbated by anthropogenic activities such as hydroelectric power plant development. Whatever the source, fragmentation can have significant ecological effects, including disruptions of migratory processes and gene flow among populations. In Chile, the Biobío River basin exhibits a high degree of habitat fragmentation due to the numerous hydroelectric power plants in operation, the number of which is expected to increase following new renewable energy use strategies. Here, we assessed the effects of different kinds of barriers on the genetic structure of the endemic freshwater fish Percilia irwini, knowledge that is critically needed to inform conservation strategies in light of current and anticipated further fragmentation initiatives in the system. We identified eight genetic units throughout the entire Biobío system with high effective sizes. A reduced effective size estimate was, however, observed in a single population located between two impassable barriers. Both natural waterfalls and human-made dams were important drivers of population differentiation in this system; however, dams affect genetic diversity differentially depending on their mode of operation. Evidence of population extirpation was found in two river stretches limited by upstream and downstream dams. Significant gene flow in both directions was found among populations not separated by natural or anthropogenic barriers. Our results suggest a significant vulnerability of P. irwini populations to future dam development and demonstrate the importance of studying basin-wide data sets with genetic metrics to understand the strength and direction of anthropogenic impacts on fish populations.
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Affiliation(s)
- Francisca Valenzuela‐Aguayo
- Laboratorio de Ecología y Conservación de PecesDepartamento de Sistemas AcuáticosFacultad de Ciencias Ambientales y Centro EULAUniversidad de ConcepciónConcepciónChile
- Department of BiologyDalhousie UniversityHalifaxNSCanada
| | | | - Aliro Manosalva
- Laboratorio de Ecología y Conservación de PecesDepartamento de Sistemas AcuáticosFacultad de Ciencias Ambientales y Centro EULAUniversidad de ConcepciónConcepciónChile
| | - Evelyn Habit
- Laboratorio de Ecología y Conservación de PecesDepartamento de Sistemas AcuáticosFacultad de Ciencias Ambientales y Centro EULAUniversidad de ConcepciónConcepciónChile
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Zamorano D, Labra FA, Villarroel M, Lacy S, Mao L, Olivares MA, Peredo-Parada M. Assessing the effect of fish size on species distribution model performance in southern Chilean rivers. PeerJ 2019; 7:e7771. [PMID: 31824752 PMCID: PMC6901005 DOI: 10.7717/peerj.7771] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 08/27/2019] [Indexed: 11/20/2022] Open
Abstract
Despite its theoretical relationship, the effect of body size on the performance of species distribution models (SDM) has only been assessed in a few studies, and to date, the evidence shows unclear results. In this context, Chilean fishes provide an ideal case to evaluate this relationship due to their short size (fishes between 5 cm and 40 cm) and conservation status, providing evidence for species at the lower end of the worldwide fish size distribution and representing a relevant management tool for species conservation. We assessed the effect of body size on the performance of SDM in nine Chilean river fishes, considering the number of records, performance metrics, and predictor importance. The study was developed in the Bueno and Valdivia basins of southern Chile. We used a neural network modeling algorithm, training models with a cross-validation scheme. The effect of fish size on selected metrics was assessed using linear models and beta regressions. While no relationship between fish size and the number of presences was found, our results indicate that the model specificity increases with fish size. Additionally, the predictive importance of Riparian Vegetation and Within-Channel Structures variables decreases for larger species. Our results suggest that the relationship between the grain of the dataset and the home range of the species could bias SDM, leading in our case, to overprediction of absences. We also suggest that evolutionary adaptation to low slopes among Chilean fishes increases the relevance of riparian vegetation in the SDMs of smaller species. This study provides evidence on how species size may bias SDM, which could potentially be corrected by adjusting the model grain.
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Affiliation(s)
- Daniel Zamorano
- Centro de Investigación e Innovación para el Cambio Climático, Facultad de Ciencias, Universidad Santo Tomás, Santiago, Chile
- Plataforma de Investigación en Ecohidrología y Ecohidráulica Limitada, Santiago, Chile
| | - Fabio A. Labra
- Centro de Investigación e Innovación para el Cambio Climático, Facultad de Ciencias, Universidad Santo Tomás, Santiago, Chile
- Programa de Doctorado en Conservación y Gestión de la Biodiversidad, Facultad de Ciencias, Universidad Santo Tomás, Santiago, Chile
| | - Marcelo Villarroel
- Plataforma de Investigación en Ecohidrología y Ecohidráulica Limitada, Santiago, Chile
| | - Shaw Lacy
- The School for Field Studies, Center for Climate Studies, Puerto Natales, Chile
| | - Luca Mao
- Instituto de Geografía, Pontificia Universidad Católica de Chile, Santiago, Chile
- School of Geography, College of Science, University of Lincoln, Lincoln, United Kingdom
| | - Marcelo A. Olivares
- Departamento de Ingeniería Civil, Universidad de Chile, Santiago, Chile
- Centro de Energía, Universidad de Chile, Santiago, Chile
| | - Matías Peredo-Parada
- Plataforma de Investigación en Ecohidrología y Ecohidráulica Limitada, Santiago, Chile
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Díaz G, Arriagada P, Górski K, Link O, Karelovic B, Gonzalez J, Habit E. Fragmentation of Chilean Andean rivers: expected effects of hydropower development. REVISTA CHILENA DE HISTORIA NATURAL 2019. [DOI: 10.1186/s40693-019-0081-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Soto MÁ, Castro JP, Walker LI, Malabarba LR, Santos MH, de Almeida MC, Moreira-Filho O, Artoni RF. Evolution of trans-Andean endemic fishes of the genus Cheirodon (Teleostei: Characidae) are associated with chromosomal rearrangements. REVISTA CHILENA DE HISTORIA NATURAL 2018. [DOI: 10.1186/s40693-018-0078-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Araya-Jaime C, Lam N, Pinto IV, Méndez MA, Iturra P. Chromosomal organization of four classes of repetitive DNA sequences in killifish Orestias ascotanensis Parenti, 1984 (Cyprinodontiformes, Cyprinodontidae). COMPARATIVE CYTOGENETICS 2017; 11:463-475. [PMID: 29093798 PMCID: PMC5646654 DOI: 10.3897/compcytogen.v11i3.11729] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Accepted: 06/14/2017] [Indexed: 06/01/2023]
Abstract
Orestias Valenciennes, 1839 is a genus of freshwater fish endemic to the South American Altiplano. Cytogenetic studies of these species have focused on conventional karyotyping. The aim of this study was to use classical and molecular cytogenetic methods to identify the constitutive heterochromatin distribution and chromosome organization of four classes of repetitive DNA sequences (histone H3 DNA, U2 snRNA, 18S rDNA and 5S rDNA) in the chromosomes of O. ascotanensis Parenti, 1984, an endemic species restricted to the Salar de Ascotán in the Chilean Altiplano. All individuals analyzed had a diploid number of 48 chromosomes. C-banding identified constitutive heterochromatin mainly in the pericentromeric region of most chromosomes, especially a GC-rich heterochromatic block of the short arm of pair 3. FISH assay with an 18S probe confirmed the location of the NOR in pair 3 and revealed that the minor rDNA cluster occurs interstitially on the long arm of pair 2. Dual FISH identified a single block of U2 snDNA sequences in the pericentromeric regions of a subtelocentric chromosome pair, while histone H3 sites were observed as small signals scattered in throughout the all chromosomes. This work represents the first effort to document the physical organization of the repetitive fraction of the Orestias genome. These data will improve our understanding of the chromosomal evolution of a genus facing serious conservation problems.
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Affiliation(s)
- Cristian Araya-Jaime
- Facultad de Medicina, Universidad de Chile, ICBM, Programa de Genética Humana, Casilla 70061, Santiago, Chile
| | - Natalia Lam
- Departamento de Producción Animal, Facultad de Ciencias Agronómicas, Universidad de Chile. Santa Rosa 11315, La Pintana, Santiago, Chile
| | - Irma Vila Pinto
- Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Casilla 653, CP 780-0024, Santiago, Chile
| | - Marco A. Méndez
- Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Casilla 653, CP 780-0024, Santiago, Chile
| | - Patricia Iturra
- Facultad de Medicina, Universidad de Chile, ICBM, Programa de Genética Humana, Casilla 70061, Santiago, Chile
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Alonso Á, Figueroa R, Castro-Díez P. Pollution Assessment of the Biobío River (Chile): Prioritization of Substances of Concern Under an Ecotoxicological Approach. ENVIRONMENTAL MANAGEMENT 2017; 59:856-869. [PMID: 28110358 DOI: 10.1007/s00267-017-0824-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 01/09/2017] [Indexed: 06/06/2023]
Abstract
The water demand for human activities is rapidly increasing in developing countries. Under these circumstances, preserving aquatic ecosystems should be a priority which requires the development of quality criteria. In this study we perform a preliminary prioritization of the risky substances based on reported ecotoxicological studies and guidelines for the Biobío watershed (Central Chile). Our specific aims are (1) reviewing the scientific information on the aquatic pollution of this watershed, (2) determining the presence and concentration of potential toxic substances in water, sediment and effluents, (3) searching for quality criteria developed by other countries for the selected substances and (4) prioritizing the most risky substances by means of deterministic ecotoxicological risk assessment. We found that paper and mill industries were the main sources of point pollution, while forestry and agriculture were mostly responsible for non-point pollution. The most risky organic substances in the water column were pentachlorophenol and heptachlor, while the most relevant inorganic ones were aluminum, copper, unionized ammonia and mercury. The most risky organic and inorganic substances in the sediment were phenanthrene and mercury, respectively. Our review highlights that an important effort has been done to monitor pollution in the Biobío watershed. However there are emerging pollutants and banned compounds-especially in sediments-that require to be monitored. We suggest that site-specific water quality criteria and sediment quality criteria should be developed for the Biobío watershed, considering the toxicity of mixtures of chemicals to endemic species, and the high natural background level of aluminum in the Biobío.
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Affiliation(s)
- Álvaro Alonso
- Department of Life Sciences, Docent Unit of Ecology, Faculty of Sciences, University of Alcalá, 28805 Alcalá de Henares, Madrid, Spain.
- Department of Aquatic Systems, Faculty of Environmental Sciences, Center EULA-Chile and Center CRHIAM, University of Concepción, Box 160-C, Concepción, Chile.
| | - Ricardo Figueroa
- Department of Aquatic Systems, Faculty of Environmental Sciences, Center EULA-Chile and Center CRHIAM, University of Concepción, Box 160-C, Concepción, Chile
| | - Pilar Castro-Díez
- Department of Life Sciences, Docent Unit of Ecology, Faculty of Sciences, University of Alcalá, 28805 Alcalá de Henares, Madrid, Spain
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Vera-Escalona I, Habit E, Ruzzante DE. The complete mitochondrial genome of the freshwater fish Galaxias platei and a comparison with other species of the genus Galaxias (faraway, so close?). Mitochondrial DNA A DNA Mapp Seq Anal 2015; 28:176-177. [PMID: 26691291 DOI: 10.3109/19401736.2015.1115497] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
We present the whole mitochondrial genome for Galaxias platei, a freshwater fish widely distributed throughout the Patagonian Andes, and compare it with the mitochondrial genome of three congeneric species. The position of G. platei in the phylogenetic reconstruction differs from that shown by earlier studies using multiple markers. We discuss the results in terms of the phylogenetic position of G. platei and the use of whole mitochondrial genomes versus specific regions of multiple organelles.
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Affiliation(s)
- Iván Vera-Escalona
- a Department of Biology , Dalhousie University , Halifax , Nova Scotia , Canada
| | - Evelyn Habit
- b Departamento De Sistemas Acuáticos, Facultad De Ciencias Ambientales Y Centro EULA-Chile , Universidad De Concepción , Barrio Universitario S/N , Concepción , Chile
| | - Daniel E Ruzzante
- a Department of Biology , Dalhousie University , Halifax , Nova Scotia , Canada
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