Results 31 to 40 of about 569,797 (126)

The hidden role of dissolved organic carbon in the biogeochemical cycle of carbon in modern redox-stratified lakes [PDF]

Biogeosciences, 2023
The dissolved organic carbon (DOC) reservoir plays a critical role in the C cycle of marine and freshwater environments because of its size and implication in many biogeochemical reactions.
R. Havas, C. Thomazo, C. Thomazo, M. Iniesto, D. Jézéquel, D. Jézéquel, D. Moreira, R. Tavera, J. Caumartin, E. Muller, P. López-García, K. Benzerara   +11 more
doaj   +1 more source

Response of diatom assemblages to orbital‐ and millennial‐scale climatic variability since the penultimate glacial maximum in the northern limit of the Neotropics

Journal of Quaternary Science, Volume 38, Issue 5, Page 750-766, July 2023., 2023
ABSTRACT Lake Chalco, in Central Mexico, has a long diatom record which provides an excellent opportunity to document the biotic and hydrological responses of this ecosystem to orbital‐ and millennial‐scale climatic variability during the last 150 ka. Detrended correspondence analysis was used to evaluate the ecological turnover and to identify diatom ...
Diana Avendaño, Margarita Caballero, Beatriz Ortega‐Guerrero, Socorro Lozano‐García   +3 more
wiley   +1 more source

Nitrogen is unlikely to consistently limit primary productivity in most tropical lakes

Ecosphere, Volume 14, Issue 3, March 2023., 2023
Abstract Despite mounting evidence that tropical lakes may experience an array of phytoplankton nutrient limitation regimes, references to low‐latitude lakes being predominantly nitrogen limited remain common in the literature. To assess the current understanding of nutrient limitation regimes in tropical lakes, we performed a literature review with ...
Jemma M. Fadum, Ed K. Hall
wiley   +1 more source

Diversity and distribution of lacustrine diatoms along the Trans‐Mexican Volcanic Belt

Freshwater Biology, Volume 68, Issue 3, Page 391-405, March 2023., 2023
Abstract The Trans‐Mexican Volcanic Belt is recognised as a highly biodiverse zone and we present a study of diatom diversity and species distributions in its lakes. We aimed to identify diatom taxa with the highest regional occupancy, explore diversity at a regional level, identify the main variables associated with species distributions, and present ...
Avendaño Diana, Caballero Margarita, Vázquez Gabriela   +2 more
wiley   +1 more source

Late Pleistocene and Holocene palaeoecological reconstruction of Lake Texcoco (Basin of Mexico) based on its ostracod record

Journal of Quaternary Science, Volume 37, Issue 7, Page 1270-1279, October 2022., 2022
Abstract We present a palaeohydrological reconstruction of Lake Texcoco over the last 32.7 cal ka based on ostracod records consisting of two species, Candona patzcuaro and Limnocytherina axalapasco. Overall, the presence of these species suggests that Lake Texcoco was highly saline and experienced occasional desiccation periods.
C.M. Chávez‐Lara, S. Lozano‐García, B. Ortega‐Guerrero, M. Caballero‐Miranda   +3 more
wiley   +1 more source

Late Holocene hydroclimate variability and human–environment interactions in the Cuenca Oriental, Mexico: multiproxy evidence from Lake Alchichica

Quaternary Science Reviews
The Cuenca Oriental, a semi-arid region in east-central Mexico, has long supported complex societies, yet its hydroclimatic variability and human–environment interactions—particularly during the Classic, Postclassic, and Colonial periods—remain poorly understood. Here, we present high-resolution proxy records from Lake Alchichica, a crater lake located
Reza Safaierad, I. Israde-Alcántara, Marttiina V. Rantala, G. Domínguez-Vázquez, M. Mohtadi, E. Schefuß, Wojciech Tylmann, Pierre Francus, Nadine Mattielli, Sarah E. Metcalfe, Nathalie Fagel   +10 more
semanticscholar   +3 more sources

Deposition, burial and sequestration of carbon in an oligotrophic, tropical lake

Journal of Limnology, 2014
The amount of biogenic carbon that may be deposited, buried and eventually preserved (sequestered) in the sediments of a tropical, oligotrophic lake, was evaluated based on i) the temporal variation of the particulate organic carbon (POC) concentration ...
Javier Alcocer, Ana C. Ruiz-Fernández, Elva Escobar, Libia H. Pérez-Bernal, Luis A. Oseguera, Vilma Ardiles-Gloria   +5 more
doaj   +1 more source

Profundal benthic invertebrates in an oligotrophic tropical lake: different strategies for coping with anoxia

Journal of Limnology, 2014
The deep benthic communities of tropical lakes are poorly understood with respect to their composition, abundance, biomass and regulatory factors. Whereas the hypolimnia of temperate oligotrophic lakes remain oxygenated, the higher temperatures in ...
María del Carmen Hernández, Javier Alcocer, Luis A. Oseguera, Elva Escobar   +3 more
doaj   +1 more source

Estimation of the eddy diffusivity coefficient in a warm monomictic tropical Lake

Journal of Limnology, 2016
We used a two-year dataset (1998-1999) of monthly temperature profiles from Lake Alchichica, Mexico to estimate values of the vertical coefficient of eddy diffusivity.
David A. Salas de León, Javier Alcocer, Vilma Ardiles Gloria, Benjamín Quiroz-Martínez   +3 more
doaj   +1 more source

Identifying microbial life in rocks: Insights from population morphometry

Geobiology, Volume 18, Issue 3, Page 282-305, May 2020., 2020
Abstract The identification of cellular life in the rock record is problematic, since microbial life forms, and particularly bacteria, lack sufficient morphologic complexity to be effectively distinguished from certain abiogenic features in rocks. Examples include organic pore‐fillings, hydrocarbon‐containing fluid inclusions, organic coatings on ...
Joti Rouillard, Juan Manuel García-Ruiz, Linda Kah, Emmanuelle Gérard, Laurie Barrier, Sami Nabhan, Jian Gong, Mark A. van Zuilen   +7 more
wiley   +1 more source