Time filter

Source Type

Laich F.,Instituto Canario Of Investigaciones Agrarias | Laich F.,Civil University Eloy Alfaro of Manabi | Chavez R.,University of Santiago de Chile | Vaca I.,University of Chile
Antonie van Leeuwenhoek, International Journal of General and Molecular Microbiology | Year: 2014

A basidiomycetous yeast, strain E2A-C3-II, was isolated from a marine sponge (Hymeniacidon sp.) collected at a depth of 6 m in Fildes Bay, King George Island, Antarctica. The phylogenetic analysis revealed that the yeast isolated is related to Leucosporidium drummii, Leucosporidiella muscorum and to the Leucosporidium scottii group, including Leucosporidiella creatinivora and Leucosporidiella yakutica. The analysis of the nucleotide differences and the genetic distances of the D1/D2 domain of the LSU rDNA gene and 5.8S ITS regions support that strain E2A-C3-II represents a new species. The novel species can be distinguished from L. drummii by its ability to assimilate l-sorbose, l-rhamnose, lactose and ribitol. The maximum temperature for growth was 25 C. On the basis of morphological, biochemical and physiological characterization, and phylogenetic and nucleotide analysis, a novel basidiomycetous yeast species, Leucosporidium escuderoi f.a., sp. nov., is proposed. The type strain is E2A-C3-IIT (=CBS 12734T =CECT 13080T). The Mycobank (http://www.mycobank.org) accession number is MB 804654. The nucleotide sequences of D1/D2 domain of the LSU rDNA gene and 5.8S-ITS regions obtained in this work have been deposited in Genbank under the Accession numbers JN181009 and JN197600, respectively. © 2014 Springer Science+Business Media Dordrecht. Source

Araujo C.V.M.,University of Coimbra | Araujo C.V.M.,Civil University Eloy Alfaro of Manabi | Shinn C.,University of Coimbra | Mendes L.B.,University of Sao Paulo | And 3 more authors.
Science of the Total Environment | Year: 2014

The present study examines the ability of juvenile Danio rerio to avoid pyrimethanil-contaminated water. An avoidance assay system was used with a contamination gradient formed by seven compartments, through which the fish could move and choose the preferred compartment(s). Additionally, the influence of fish movements in promoting the mixing between compartments and thus disruption of the gradient over time was also examined by testing sodium chloride (NaCl) at sublethal concentrations. Samples with pyrimethanil were obtained from the commercial formulation Mythos®, which was applied to mesocosm systems. Samples of the pyrimethanil-contaminated mesocosms water were collected and a series of seven concentrations (0.2 to 1.4mgL-1 plus a control) diluted with reference (uncontaminated) mesocosm water were added to the system to form the gradient. After 4h exposure, fish avoidance in the three highest pyrimethanil concentrations ranged from 29 to 66%. The 4h-AC50 (concentration at which 50% of the fish avoided pyrimethanil after 4h exposure) was 1.10 (confidence interval: 1.07 to 1.12)mgL-1. However, the avoidance pattern after 12h was strongly reduced and it was not possible to calculate the AC50. This is explained by the results of the NaCl experiment, which showed that the movement of fish in the system accelerates the mixing of the solutions between compartments. As pyrimethanil can trigger avoidance response in D. rerio, this fungicide, even at non-lethal concentrations, could be considered an environmental disturber. © 2014 Elsevier B.V. Source

Gomez S.,National Autonomous University of Mexico | Morales-Serna F.N.,Civil University Eloy Alfaro of Manabi
Proceedings of the Biological Society of Washington | Year: 2014

An account of previous lists and descriptions of marine and freshwater harpacticoid copepods of Mexico yielded, by year 2010, 71 marine and 21 freshwater species from a variety of habitats. Sediment samples from the littoral zone to more than 2000 m depth along the Mexican Pacific coast, from the west coast of the Baja California peninsula, from the Gulf of Mexico, and from anchialine caves and cenotes from Yucatan, were taken during the last 15 yr as a continued effort to improve our knowledge of the diversity of the harpacticoid fauna from Mexico. This study shows that, at present, 151 species/subspecies distributed in 85 genera and 31 families are known from Mexican marine and freshwater systems. Additionally, a number of species belonging to 78 genera and 25 families are yet to be described. The checklist contains information on the locality, geographic coordinates, habitat, and source of the recorded taxa. There is a better knowledge of the harpacticoids from Sinaloa (northwestern Mexico). However, the number of species from Mexico is expected to grow rapidly in the forthcoming years. Source

Araujo C.V.M.,Civil University Eloy Alfaro of Manabi | Araujo C.V.M.,University of Coimbra | Cedeno-Macias L.A.,Civil University Eloy Alfaro of Manabi
Science of the Total Environment | Year: 2016

Heavymetals are contaminants of great environmental concern due to theirmultiple origins (natural and anthropogenic), the ability to accumulate in organs and tissues, and the deleterious effects they can cause in organisms. Studies on the accumulation of metals in seafood, such as fish, have increased in importance due to the risk for human health when consuming fish contaminated by metals. The present work was aimed at verifying the concentrations of cadmium (Cd), mercury (Hg) and lead (Pb) in the muscular tissue and liver of yellowfin tuna (Thunnus albacares) and common dolphinfish (Coryphaena hippurus) from the Eastern Pacific Ocean landed in Manta city, Ecuador. Sampleswere analyzed by inductively coupled plasma mass spectroscopy (ICP-MS). Around half of the muscle samples of both species presented levels of Cd and Hg above the limits considered safe for human consumption established by the European Union. For Pb,most of themuscle samples were considered acceptable for consumption. Results indicate that both species should be consumedwith some caution. Considering the tolerableweekly intake recommended for adults by theWorld Health Organization, results indicate that Hg is the main metal that limits the consumption of yellowfin tuna and common dolphinfish, with a recommended maximum ingestion, respectively, of 191 and 178 g per week for an adult. © 2015 Elsevier B.V. Source

The western lowlands of Ecuador form part of the Tumbes-Chocó-Magdalena hotspot, a region with exceptionally high endemism but also elevated rates of deforestation. The Critically Endangered Ecuadorian brown-headed spider monkey (Ateles fusciceps fusciceps) is endemic to the region and threatened by continuing habitat loss and hunting. Studies of the species’ conservation status maintain that its current distribution is restricted to several large tracts of primary forest remaining in northwestern Ecuador, and that the total population numbers around 250 individuals. We report a previously unknown population of brown-headed spider monkeys found 100 km southwest of the species’ known distribution in a highly fragmented landscape of Manabí province. This finding not only represents an important advance in our knowledge of the species’ geographic distribution, but also suggests that brown-headed spider monkeys may be able to persist as a metapopulation in human-modified landscapes. © Laura Cervera and Daniel M. Griffith. Source

Discover hidden collaborations