Results 41 to 50 of about 412 (115)

Phenotypic plasticity of life-history traits of a calanoid copepod in a tropical lake: Is the magnitude of thermal plasticity related to thermal variability?

open access: yesPLoS ONE, 2018
According to the Climatic Variability Hypothesis [CVH], thermal plasticity should be wider in organisms from temperate environments, but is unlikely to occur in tropical latitudes where temperature fluctuations are narrow.
Elizabeth Ortega-Mayagoitia   +2 more
doaj   +1 more source

Caco3 precipitation in multilayered cyanobacterial mats: Clues to explain the alternation of micrite and sparite layers in calcareous stromatolites [PDF]

open access: yes, 2015
© 2015 by the authors; licensee MDPI, Basel, Switzerland. Marine cyanobacterial mats were cultured on coastal sediments (Nivå Bay, Øresund, Denmark) for over three years in a closed system. Carbonate particles formed in two different modes in the mat: (i)
Fenchel, T   +6 more
core   +3 more sources

Preservation in microbial mats: mineralization by a talc-like phase of a fish embedded in a microbial sarcophagus [PDF]

open access: yes, 2015
Frontiers in Earth Science 3 (2015): 51 This Document is Protected by copyright and was first published by Frontiers. All rights reserved. it is reproduced with permissionMicrobial mats have been repeatedly suggested to promote early fossilization of ...
Benzerara, Karim   +6 more
core   +4 more sources

Why bacteria are smaller in the epilimnion than in the hypolimnion? A hypothesis comparing temperate and tropical lakes

open access: yesJournal of Limnology, 2012
Bacterial size and morphology are controlled by several factors including predation, viral lysis, UV radiation, and inorganic nutrients. We observed that bacterial biovolume from the hypolimnion of two oligotrophic lakes is larger than that of bacteria ...
Roberto Bertoni   +3 more
doaj   +1 more source

A Novel Microbialite-Associated Phototrophic Chloroflexi Lineage Exhibiting a Quasi-Clonal Pattern along Depth [PDF]

open access: yes, 2020
Chloroflexales (Chloroflexi) are typical members of the anoxygenic photosynthesizing component of microbial mats and have mostly been characterized from communities associated to hot springs.
Lopez-Garcia, Purificacion   +4 more
core   +4 more sources

16S rDNA-based analysis reveals cosmopolitan occurrence but limited diversity of two cyanobacterial lineages with contrasted patterns of intracellular carbonate mineralization

open access: yesFrontiers in Microbiology, 2014
Cyanobacteria are mainly thought to induce carbonate precipitation extracellularly via their photosynthetic activity combined with the nucleation potential of exopolymeric substances. The discovery in microbialites of the alkaline lake Alchichica (Mexico)
Marie eRagon   +5 more
doaj   +1 more source

Geomicrobiological study of modern microbialites from Mexico: towards a better understanding of the ancient fossil record

open access: yesBIO Web of Conferences, 2014
Microbialites are sedimentary formations that are found throughout the geological record and are usually considered as one of the oldest traces of life on Earth.
Benzerara K.   +6 more
doaj   +1 more source

Spectroscopic analysis of modern Mg-carbonates from multiple mafic/ultramafic environments with relevance to Jezero crater, Mars [PDF]

open access: yes, 2023
The detection and presence of carbonates on Mars and within Jezero crater implies and supports an extensive aqueous history during the Noachian to early Hesperian and can help with the reconstruction of paleoenvironments.
Turenne, Nathalie
core   +1 more source

Ciliate food vacuole content and bacterial community composition in the warm-monomictic crater Lake Alchichica, México [PDF]

open access: yesFEMS Microbiology Ecology, 2011
To evaluate trophic relationships between ciliates and bacterioplankton during the stratification period in a lake, samples from three different layers [the upper part of the metalimnion (UM), the base of the metalimnion (BM) and the hypolimnion] were studied. The autotrophic picoplankton numbers, phylogenetic composition of heterotrophic picoplankton (
Fernando, Bautista-Reyes   +1 more
openaire   +2 more sources

Using Wavelet Analysis to Examine Long-Term Variability of Phytoplankton Biomass in the Tropical, Saline Lake Alchichica, Mexico

open access: yesWater, 2022
The phytoplankton biomass (chlorophyll-a, Chl-a) is directly related to the total production of lakes. Chl-a in temperate lakes oscillates on an annual scale. However, Chl-a oscillations in tropical lakes have hardly been documented, particularly over multiple years.
Javier Alcocer   +4 more
openaire   +1 more source

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