Database : MEDLINE
Search on : B01.050.150.900.493.130.150 [DeCS Category]
References found : 304 [refine]
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PMID:28985654
Author:Tolussi CE; Gomes ADO; Kumar A; Ribeiro CS; Nostro FLL; Bain PA; de Souza GB; Cuña RD; Honji RM; Moreira RG
Address:Laboratório de Metabolismo e Reprodução de Organismos Aquáticos, Departamento de Fisiologia, Instituto de Biociências, Universidade de São Paulo. Rua do Matão, Trav.14, n° 321, 05508-090 São Paulo, SP, Brazil. Electronic address: ctolussi@usp.br.
Title:Environmental pollution affects molecular and biochemical responses during gonadal maturation of Astyanax fasciatus (Teleostei: Characiformes: Characidae).
Source:Ecotoxicol Environ Saf; 147:926-934, 2018 Jan.
ISSN:1090-2414
Country of publication:Netherlands
Language:eng
Abstract:Endocrine disrupting compounds (EDCs) have the potential to alter fish reproduction at various levels of organization. The aim of this study was to assess the impact of a natural environment with heavily anthropogenic influence on the physiological processes involved in reproduction in the freshwater fish lambari (Astyanax fasciatus) using different biomarkers. Adult males and females were collected in different seasons from two distinct sites in the same watershed: Ponte Nova Reservoir (PN) considered a pristine or small anthropogenic influence reference point; and Billings Reservoir (Bil), subjected to a large anthropogenic impact. Biological indices, such as hepatosomatic index and gonadosomatic index (GSI), gonadal histomorphology, fecundity, and biomarkers such as plasma levels of estradiol (E2) as well as hepatic gene expression of its alfa nuclear receptor (ERα), were analyzed. Hepatic vitellogenin (VTG) gene expression was evaluated in both sexes, as an indicator of xenoestrogen exposure. Females collected at PN presented a typical annual variation reflected in GSI, whereas for those sampled at Bil the index did not change through the seasons. The higher concentration of E2 in males collected at Bil during spring/2013, together with the detection of VTG gene expression, suggest the presence of EDCs in the water. These EDCs may have also influenced fecundity of females from Bil, which was higher during winter and spring/2013. Gene expression of ERα and ovarian morphology did not differ between fish from both sites. Water conditions from Bil reservoir impacted by anthropic activity clearly interfered mainly with biomarkers of biological effect such as plasma E2 levels and absolute and relative fecundity, but also altered biomarkers of exposure as VTG gene expression. These facts support the notion that waterborne EDCs are capable of causing estrogenic activity in A. fasciatus.
Publication type:JOURNAL ARTICLE; REVIEW
Name of substance:0 (Biomarkers); 0 (Endocrine Disruptors); 0 (Vitellogenins); 0 (Water Pollutants, Chemical); 4TI98Z838E (Estradiol)


  2 / 304 MEDLINE  
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PMID:28455549
Author:Cassel M; de Paiva Camargo M; Oliveira de Jesus LW; Borella MI
Address:Fish Endocrinology Laboratory, Department of Cell and Developmental Biology, Institute of Biomedical Sciences, University of São Paulo, Av Prof Lineu Prestes n. 1524, lab 426, São Paulo, SP, CEP 05508-000, Brazil. monica_cassel@usp.br.
Title:Involution processes of follicular atresia and post-ovulatory complex in a characid fish ovary: a study of apoptosis and autophagy pathways.
Source:J Mol Histol; 48(3):243-257, 2017 Jun.
ISSN:1567-2387
Country of publication:Netherlands
Language:eng
Abstract:Recent studies seem to indicate that apoptosis and autophagy can act cooperatively in fish ovaries in order to achieve more effective ovarian regression after spawning. Considering the importance of tissue remodeling in ovarian functioning, we sought to morphologically characterize the involution processes of follicular atresia and post-ovulatory complexes using Astyanax altiparanae as an experimental model, and to determine the location of proteins involved in apoptosis and autophagy throughout this process. Fifteen females were collected after reproductive management. Fragments of the left ovaries were removed, fixed, and prepared for light microscopy and immunofluorescence analyses. The main characteristics of the involution processes were found to be consistent with previous descriptions. However, there were certain morphological peculiarities that do not appear to have been described for any other species thus far. These peculiarities may be related to the focus of this study on a single species, which allows for a more detailed investigation into morphological changes than studies on multiple species. Autophagy was also found to precede apoptosis in both involution processes in A. altiparanae. This may be related to the energy recycling process required before the removal of degenerated follicular cells by apoptosis. Thus, these results support the idea that there is crosstalk between autophagy and apoptosis pathways in ovarian involution processes, as well as the idea that the cell death pathways of these processes are conserved between teleost species with external fertilization.
Publication type:JOURNAL ARTICLE


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PMID:29261722
Author:Jardim de Queiroz L; Torrente-Vilara G; Quilodran C; Rodrigues da Costa Doria C; Montoya-Burgos JI
Address:Department of Genetics and Evolution, University of Geneva, Geneva, Switzerland.
Title:Multifactorial genetic divergence processes drive the onset of speciation in an Amazonian fish.
Source:PLoS One; 12(12):e0189349, 2017.
ISSN:1932-6203
Country of publication:United States
Language:eng
Abstract:Understanding the processes that drive population genetic divergence in the Amazon is challenging because of the vast scale, the environmental richness and the outstanding biodiversity of the region. We addressed this issue by determining the genetic structure of the widespread Amazonian common sardine fish Triportheus albus (Characidae). We then examined the influence, on this species, of all previously proposed population-structuring factors, including isolation-by-distance, isolation-by-barrier (the Teotônio Falls) and isolation-by-environment using variables that describe floodplain and water characteristics. The population genetics analyses revealed an unusually strong structure with three geographical groups: Negro/Tapajós rivers, Lower Madeira/Central Amazon, and Upper Madeira. Distance-based redundancy analyses showed that the optimal model for explaining the extreme genetic structure contains all proposed structuring factors and accounts for up to 70% of the genetic structure. We further quantified the contribution of each factor via a variance-partitioning analysis. Our results demonstrate that multiple factors, often proposed as individual drivers of population divergence, have acted in conjunction to divide T. albus into three genetic lineages. Because the conjunction of multiple long-standing population-structuring processes may lead to population reproductive isolation, that is, the onset of speciation, we suggest that the multifactorial population-structuring processes highlighted in this study could account for the high speciation rate characterising the Amazon Basin.
Publication type:JOURNAL ARTICLE


  4 / 304 MEDLINE  
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PMID:28658255
Author:Malato G; Shervette VR; Navarrete Amaya R; Valdiviezo Rivera J; Nugra Salazar F; Calle Delgado P; Karpan KC; Aguirre WE
Address:Department of Biological Sciences, DePaul University, Chicago, Illinois, United States of America.
Title:Parallel body shape divergence in the Neotropical fish genus Rhoadsia (Teleostei: Characidae) along elevational gradients of the western slopes of the Ecuadorian Andes.
Source:PLoS One; 12(6):e0179432, 2017.
ISSN:1932-6203
Country of publication:United States
Language:eng
Abstract:Neotropical mountain streams are important contributors of biological diversity. Two species of the characid genus Rhoadsia differing for an ecologically important morphological trait, body depth, have been described from mountain streams of the western slopes of the Andes in Ecuador. Rhoadsia altipinna is a deeper-bodied species reported from low elevations in southwestern Ecuador and northern Peru, and Rhoadsia minor is a more streamlined species that was described from high elevations (>1200 m) in the Esmeraldas drainage in northwestern Ecuador. Little is known about these species and their validity as distinct species has been questioned. In this study, we examine how their body shape varies along replicated elevational gradients in different drainages of western Ecuador using geometric morphometrics and the fineness ratio. We also use sequences of the mitochondrial cytochrome oxidase c I gene and the second intron of the S7 nuclear gene to examine whether genetic data are consistent with the existence of two species. We found that body depth varies continuously among populations within drainages as a function of elevation, and that body shape overlaps among drainages, such that low elevation populations of R. minor in the Esmeraldas drainage have similar body depths to higher elevation R. altipinna in southern drainages. Although a common general trend of declining body depth with elevation is clear, the pattern and magnitude of body shape divergence differed among drainages. Sequencing of mitochondrial and nuclear genes failed to meet strict criteria for the recognition of two species (e.g., reciprocal monophyly and deep genetic structure). However, there was a large component of genetic variation for the COI gene that segregated among drainages, indicating significant genetic divergence associated with geographic isolation. Continued research on Rhoadsia in western Ecuador may yield significant insight into adaptation and speciation in Neotropical mountain streams.
Publication type:JOURNAL ARTICLE
Name of substance:EC 1.9.3.1 (Electron Transport Complex IV)


  5 / 304 MEDLINE  
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PMID:28644725
Author:Fiorelini Pereira B; Alves AL; Senhorini JA; Hakime Scalize P; Tocchini De Figueiredo FA; Pitol DL; Caetano FH
Address:a School of Biology and Human Health , The Federal University of Western Bahia , Barreiras , Brazil.
Title:Quantifying structural modifications of gills of two fish species Astyanax altiparanae (Lambari) and Prochilodus lineatus (Curimbatá) after exposure to biodegradable detergents in urban lake water.
Source:J Toxicol Environ Health A; 80(6):338-348, 2017.
ISSN:1528-7394
Country of publication:England
Language:eng
Abstract:Anthropic actions in rivers and urban lakes are a cause for concern to our ecosystem. The effects on fauna and flora of substances discharged into waterways have become a focus for investigations globally. Biodegradable detergents are widely used in residences and small industries, but little is known regarding the consequences on fish fauna. The objective of the present study was to identify modifications in gill structure in two fish species, Astyanax altiparanae and Prochilodus lineatus, after treatment with water obtained from an urban lake and an exposure to 1 ppm diluted biodegradable detergents (linear alkylbenzene sulfonate). Data demonstrated exposure to urban lake produced various alterations in gill functions such as lamellar fusions, aneurysms, mucous, and chlorine cell proliferation, which may be attributed to the presence of detergents in the water but may also be a consequence of synergetic actions of detergents with other pollutants. Results showed that the levels of NO , Na, F , Cl , and Fe were significantly higher in urban lake water but in the presence of detergents Ni was also detected. Evidence indicates that biodegradable detergents produce damage to gill functions, which subsequently alters the fish physiology and reduces the ability to cope with stress and survival.
Publication type:JOURNAL ARTICLE
Name of substance:0 (Detergents); 0 (Water Pollutants, Chemical)


  6 / 304 MEDLINE  
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PMID:28551582
Author:Marcon L; Thomé RG; Mounteer AH; Bazzoli N; Rizzo E; Benjamin LDA
Address:Departamento de Veterinária, Universidade Federal de Viçosa, Av. Peter Henry Rolfs s/n, Campus Universitário, 36570-000 Viçosa, MG, Brasil; Programa de Pós-graduação em Biologia de Vertebrados, PUC-Minas, Av. Dom José Gaspar, 500, Coração Eucarístico, 30535-610 Belo Horizonte, MG, Brasil. Electronic
Title:Immunohistochemical, morphological and histometrical analyses of follicular development in Astyanax bimaculatus (Teleostei: Characidae) exposed to an organochlorine insecticide.
Source:Ecotoxicol Environ Saf; 143:249-258, 2017 Sep.
ISSN:1090-2414
Country of publication:Netherlands
Language:eng
Abstract:Thiodan is an organochlorine insecticide used in agriculture that can reach aquatic ecosystems where it can affect fish reproduction. This research aimed to evaluate follicular development and the expression of integrin ß1, collagen type IV and caspase 3 by morphological, histometrical and immunohistochemical analyses of Astyanax bimaculatus exposed to Thiodan . Treatments included three sublethal concentrations of Thiodan (1.15, 2.30, and 5.60µgL ) for 96h and a control without the insecticide. Mature females with ovaries in advanced follicular development were chosen for study (average weight: 11.52 ± 2.0g; average total length: 9.12 ± 0.64cm). The follicles of A. bimaculatus exhibited normal morphology, while the diameters of secondary follicles showed an increase (P< 0.05) in all concentrations when compared to the control group; a characteristic of follicles undergoing the initial stages of intoxication. Immunohistochemical analysis revealed secondary follicles with greater expression of integrin ß1 and collagen type IV in cytoplasm of follicular cells than in the primary follicles in all treatments and in the control. Immunolocalization of caspase 3 was detected in follicular cells during secondary development in all tested concentrations of Thiodan and the control. These analyses demonstrate positive immunolocalization throughout the course of follicular development, even in fish exposed to varying concentrations of Thiodan for 96h, demonstrating that follicular cells retain their physiological integrity.
Publication type:JOURNAL ARTICLE
Name of substance:0 (Insecticides); 0 (Water Pollutants, Chemical); OKA6A6ZD4K (Endosulfan)


  7 / 304 MEDLINE  
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PMID:28516254
Author:Nimet J; Guimarães ATB; Delariva RL
Address:Centro de Ciências Biológicas e da Saúde, Programa de Pós-Graduação em Conservação e Manejo de Recursos Naturais, Universidade Estadual do Oeste do Paraná, Rua Universitária 2069, Caixa postal 711, Cascavel, Paraná, 85819-110, Brazil. jardelnimet@gmail.com.
Title:Use of Muscular Cholinesterase of Astyanax bifasciatus (Teleostei, Characidae) as a Biomarker in Biomonitoring of Rural Streams.
Source:Bull Environ Contam Toxicol; 99(2):232-238, 2017 Aug.
ISSN:1432-0800
Country of publication:United States
Language:eng
Abstract:Cholinesterase (ChE) activity was measured in Astyanax bifasciatus maintained in controlled conditions. Muscle ChE activity of individuals collected in field conditions in two seasons was compared among specimens collected in seven streams (forest and rural) of the lower Iguaçu river basin in association with physical, chemical, pesticides and biological factors. Significant differences in muscle ChE activity between control fish and fish collected in streams in both seasons were found, with higher activity in natural conditions. This the first time that differences in muscle ChE activity have been found among fish collected from different streams, suggesting synergism among multiple factors (e.g. temperature, pH, animal weight) and ecological attributes (richness and abundance) as influencing the variation in biomarkers. It is necessary to evaluate the quality of aquatic environments for a more accurate biomonitoring approach.
Publication type:JOURNAL ARTICLE
Name of substance:0 (Biomarkers); 0 (Pesticides); 0 (Water Pollutants, Chemical); EC 3.1.1.8 (Cholinesterases)


  8 / 304 MEDLINE  
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PMID:28486546
Author:Powers AK; Davis EM; Kaplan SA; Gross JB
Address:Department of Biological Sciences, University of Cincinnati, Cincinnati, Ohio, United States of America.
Title:Cranial asymmetry arises later in the life history of the blind Mexican cavefish, Astyanax mexicanus.
Source:PLoS One; 12(5):e0177419, 2017.
ISSN:1932-6203
Country of publication:United States
Language:eng
Abstract:As a consequence of adaptation to the cave environment, the blind Mexican cavefish, Astyanax mexicanus, has evolved several cranial aberrations including changes to bone sizes, shapes and presence of numerous lateral asymmetries. Prior studies of cranial asymmetry in cavefish focused strictly on adult specimens. Thus, the extent to which these asymmetries emerge in adulthood, or earlier in the life history of cavefish, was unknown. We performed a geometric morphometric analysis of shape variation in the chondrocranium and osteocranium across life history in two distinct cavefish populations and surface-dwelling fish. The cartilaginous skull in juveniles was bilaterally symmetric and chondrocranial shape was conserved in all three populations. In contrast, bony skull shapes segregated into significantly distinct groups in adults. Cavefish demonstrated significant asymmetry for the bones surrounding the collapsed eye orbit, and the opercle bone posterior to the eye orbit. Interestingly, we discovered that cavefish also exhibit directional "bends" in skull shape, almost always biased to the left. In sum, this work reveals that asymmetric craniofacial aberrations emerge later in the cavefish life history. These abnormalities may mirror asymmetries in the lateral line sensory system, reflect a 'handedness' in cavefish swimming behavior, or evolve through neutral processes.
Publication type:JOURNAL ARTICLE


  9 / 304 MEDLINE  
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PMID:28355106
Author:Santos ARD; Usso MC; Gouveia JG; Araya-Jaime C; Frantine-Silva W; Giuliano-Caetano L; Foresti F; Dias AL
Address:1 Laboratório de Citogenética Animal, Departamento de Biologia Geral, Universidade Estadual de Londrina , Londrina, Brazil .
Title:Chromosomal Mapping of Repetitive DNA Sequences in the Genus Bryconamericus (Characidae) and DNA Barcoding to Differentiate Populations.
Source:Zebrafish; 14(3):261-271, 2017 Jun.
ISSN:1557-8542
Country of publication:United States
Language:eng
Abstract:The mapping of repetitive DNA sites by fluorescence in situ hybridization has been widely used for karyotype studies in different species of fish, especially when dealing with related species or even genera presenting high chromosome variability. This study analyzed three populations of Bryconamericus, with diploid number preserved, but with different karyotype formulae. Bryconamericus ecai, from the Forquetinha river/RS, presented three new cytotypes, increasing the number of karyotype forms to seven in this population. Other two populations of Bryconamericus sp. from the Vermelho stream/PR and Cambuta river/PR exhibited interpopulation variation. The chromosome mapping of rDNA sites revealed unique markings among the three populations, showing inter- and intrapopulation variability located in the terminal region. The molecular analysis using DNA barcoding complementing the cytogenetic analysis also showed differentiation among the three populations. The U2 small nuclear DNA repetitive sequence exhibited conserved features, being located in the interstitial region of a single chromosome pair. This is the first report on its occurrence in the genus Bryconamericus. Data obtained revealed a karyotype variability already assigned to the genus, along with polymorphism of ribosomal sites, demonstrating that this group of fish can be undergoing a divergent evolutionary process, constituting a substantive model for studies of chromosomal evolution.
Publication type:JOURNAL ARTICLE


  10 / 304 MEDLINE  
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PMID:28264349
Author:Zanata AM; Lima FC; Dario FD; Gerhard P
Address:Departamento de Zoologia, Instituto de Biologia, Universidade Federal da Bahia Rua Barão de Geremoabo, 147, Ondina, 40170-290, Salvador, BA, Brazil.. zanata.angela@gmail.com.
Title:A new remarkable and Critically Endangered species of Astyanax Baird & Girard (Characiformes: Characidae) from Chapada Diamantina, Bahia, Brazil, with a discussion on durophagy in the Characiformes.
Source:Zootaxa; 4232(4):zootaxa.4232.4.2, 2017 Feb 20.
ISSN:1175-5334
Country of publication:New Zealand
Language:eng
Abstract:Astyanax brucutu is described from the rio Pratinha, rio Paraguaçu basin, Bahia, Brazil. The new species is promptly distinguished from other characids by having four, rarely three, robust, rounded, and usualy tricuspid teeth on inner premaxillary series and similar teeth on dentary. The species is furthermore characterized by a series of unusual character states in the Characidae, including head blunt in lateral and dorsal views, longitudinal foreshortening of lower jaw, ventral margin of third infraorbital distinctly separated from horizontal limb of preopercle, leaving a broad area without superficial bones, mesethmoid anteroventrally expanded, and adductor mandibulae and primordial ligament remarkably developed. Analysis of gut contents of adults revealed the almost exclusive presence of crushed shells of tiny gastropods of the family Hydrobiidae. The robust anatomy of jaws, teeth, muscles and associated ligaments are likely adaptations to durophagy, a feeding strategy unusual among characids. Astyanax brucutu is known only from its type locality, an approximately 670 m long, transparent and isolated perennial epigean watercourse surrounded by subterranean or intermittent rivers. The distinctive combination of environmental features characterizing the area of occurrence of the new species is not observed elsewhere in the basin or adjacent basins. A series of severe anthropogenic impacts, associated with the restricted geographic range of the species, implies that A. brucutu should be regarded as Critically Endangered (CR) according to IUCN Red List Criteria.
Publication type:JOURNAL ARTICLE



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