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Wyszukujesz frazę "Lara, Enrique" wg kryterium: Autor


Wyświetlanie 1-2 z 2
Tytuł:
Population dynamics of amoeboid protists in a tropical desert: seasonal changes and effects of vegetation and soil conditions
Autorzy:
Pérez-Juárez, Horacio
Serrano-Vázquez, Angélica
Lara, Enrique
Ximénez, Cecilia
Godínez-Alvarez, Héctor
Rodríguez-Zaragoza, Salvador
Eguiarte, Luis E.
Hernández Moreno, Mayra M.
Fernández, Leonardo D.
Rojas-Velázquez, Liliana
Morán, Patricia
Castillo, Mariela
Rivera Aguilar, Víctor M.
Powiązania:
https://bibliotekanauki.pl/articles/52257794.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Heterolobosea
seasonal variation
soil microhabitat
soil protist
Tehuacán desert
Opis:
In arid environments, protist diversity is higher in soil covered by vegetation than in bare soil and is also likely to vary in line with the marked seasonal patterns; however, these patterns have not been explored in detail in arid zones. Herein, we used culture – and morphological-based approaches to describe patterns of amoeboid protist diversity in  vegetated and bare soil areas from the intertropical desert of Tehuacán, Mexico, during dry and wet seasons. Overall, 27 protist species belonging to Amoebozoa, Discoba and Rhizaria were retrieved using culture-dependent methods. Among the soil protist groups found, Discoba (principally represented by Heterolobosea) was always the most prevalent taxa. Protist diversity was different between soil with vegetation and bare soil, principally during the dry season. Moreover, the electrical conductivity and pH of the soil were correlated with the protist species during the wet season. Our results support the hypothesis that soil protist diversity patterns exhibit a seasonal variation between dry  and wet seasons. This seasonal variation likely relies on water availability, although the role of other environmental factors cannot be completely ruled out. In addition, the soils with vegetation could be a refuge for the amoeboid protists during the harsh soil conditions of dry seasons.
Źródło:
Acta Protozoologica; 2018, 57, 4; 231-242
0065-1583
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Achradina pulchra, a Unique Dinoflagellate (Amphilothales, Dinophyceae) with a Radiolarian-like Endoskeleton of Celestite (Strontium Sulfate)
Autorzy:
Gómez, Fernando
Kiriakoulakis, Kostas
Lara, Enrique
Powiązania:
https://bibliotekanauki.pl/articles/52376314.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Acantharea
Amphilothus
barite
celestite skeleton
Dinoflagellata
endosymbiosis
gene transfer
plankton symbiosis
Retaria
Opis:
We examined the planktonic dinoflagellate Achradina pulchra by light and scanning electron microscopies from the South and North Atlantic oceans. The basket-like skeleton has been interpreted as a thick cell covering or pellicle of organic composition, or as a siliceous endoskeleton. The skeleton of Achradina is known only from fresh material, being absent in preserved samples, sediments or the fossil record. X-ray microanalysis revealed that the endoskeleton of Achradina is composed of celestite (strontium sulfate) with traces of barite (barium sulfate), two minerals that readily dissolve after cell death. To date, Acantharia and polycystine radiolarians (Retaria) were the only known organisms with a skeleton of this composition. We can now add a dinoflagellate to the list of such mineralized skeletons, which influence on the biogeochemical fluxes of strontium and barium in the oceans. Moreover, we provided the first molecular data for a skeleton-bearing dinoflagellate. Molecular phylogeny based on the SSU rRNA gene sequences revealed that Achradina and several environmental clones branched as an independent lineage within the short-branching dinokaryotic dinoflagellates. To date, seven clades of dinokaryotic dinoflagellates are known living as symbionts in the endoplasm of Acantharia and polycystine radiolarians. Because celestite built skeletons were unknown outside radiolarians, we suggested that the ancestors of Achradina acquired the genes implicated in the deposition of strontium and barium from radiolarian hosts though a horizontal gene transfer event between microbial eukaryotes.
Źródło:
Acta Protozoologica; 2017, 56, 2; 71-76
0065-1583
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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