Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Alfredo Martìnez-Garcia"'
Autor:
Sofia Muller, François Fripiat, Samuel L. Jaccard, Leandro Ponsoni, Jens A. Hölemann, Alfredo Martínez-García, Bruno Delille
Publikováno v:
Frontiers in Marine Science, Vol 11 (2024)
Previous studies have reported an accumulation of nitrous oxide (N2O) on shallow continental shelves of the western Arctic Ocean. In this study, we sampled seawater profiles for N2O measurements in the eastern Arctic shelves, in the North Kara Sea, i
Externí odkaz:
https://doaj.org/article/76b70b9c96bb4264a82d66b7493a424e
Autor:
Sergio Rossi, Enrique Isla, Susanne Fietz, Alfredo Martìnez-Garcia, Elisabet Sañé, Nùria Teixidò
Publikováno v:
Advances in Oceanography and Limnology, Vol 3, Iss 1, Pp 17-40 (2012)
Proportions and concentrations of seston fatty acids, n-alkanes and glycerol dialkyl glycerol tetraethers (GDGTs) were used to assess potential differences in the phytoplankton composition and food quality in the Humboldt Current System (winter 2006,
Externí odkaz:
https://doaj.org/article/15729c68c536414085ff452acc25e547
Autor:
Xuyuan E. Ai, Lena M. Thöle, Alexandra Auderset, Mareike Schmitt, Simone Moretti, Anja S. Studer, Elisabeth Michel, Martin Wegmann, Alain Mazaud, Peter K. Bijl, Daniel M. Sigman, Alfredo Martínez-García, Samuel L. Jaccard
Publikováno v:
Communications Earth & Environment, Vol 5, Iss 1, Pp 1-12 (2024)
Abstract Previous studies suggest that meridional migrations of the Antarctic Circumpolar Current may have altered wind-driven upwelling and carbon dioxide degassing in the Southern Ocean during past climate transitions. Here, we report a quantitativ
Externí odkaz:
https://doaj.org/article/49301435a23546558db055422a37108f
Autor:
Marietta Straub, Alexandra Auderset, Laurence de Leval, Nathalie Piazzon, Damien Maison, Marie-Catherine Vozenin, Jonathan Ollivier, Benoît Petit, Daniel M. Sigman, Alfredo Martínez-García
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-9 (2023)
Abstract Studies have suggested that cancerous tissue has a lower 15N/14N ratio than benign tissue. However, human data have been inconclusive, possibly due to constraints on experimental design. Here, we used high-sensitivity nitrogen isotope method
Externí odkaz:
https://doaj.org/article/45e0609ba8cd4fee9c37ac26aa0acc34
Autor:
Elan J. Levy, Hubert B. Vonhof, Miryam Bar-Matthews, Alfredo Martínez-García, Avner Ayalon, Alan Matthews, Vered Silverman, Shira Raveh-Rubin, Tami Zilberman, Gal Yasur, Mareike Schmitt, Gerald H. Haug
Publikováno v:
Nature Communications, Vol 14, Iss 1, Pp 1-13 (2023)
Abstract There is limited understanding of temperature and atmospheric circulation changes that accompany an Atlantic Meridional Overturning Circulation (AMOC) slowdown beyond the North Atlantic realm. A Peqi’in Cave (Israel) speleothem dated to th
Externí odkaz:
https://doaj.org/article/18f3e0f3a6a948849c0f45c3a277e565
Autor:
Jennifer N. Leichliter, Tina Lüdecke, Alan D. Foreman, Nicolas Bourgon, Nicolas N. Duprey, Hubert Vonhof, Viengkeo Souksavatdy, Anne-Marie Bacon, Daniel M. Sigman, Thomas Tütken, Alfredo Martínez-García
Publikováno v:
Communications Biology, Vol 6, Iss 1, Pp 1-13 (2023)
Enamel-bound nitrogen isotopes in modern and fossil mammal teeth preserve dietary and trophic level information. This novel geochemical archive can be used to reconstruct trophic niche in ancient ecosystems.
Externí odkaz:
https://doaj.org/article/3af7a39ce4c241ec8cd254add71e60ce
Autor:
Frank Sirocko, Johannes Albert, Sarah Britzius, Frank Dreher, Alfredo Martínez-García, Anthony Dosseto, Joachim Burger, Thomas Terberger, Gerald Haug
Publikováno v:
Scientific Reports, Vol 12, Iss 1, Pp 1-15 (2022)
Abstract Lake sediment records from Holzmaar and the infilled maar of Auel (Eifel, Germany) are used to reconstruct landscape changes and megafauna abundances. Our data document a forested landscape from 60,000 to 48,000 yr b2k and a stepwise vegetat
Externí odkaz:
https://doaj.org/article/376fff0e86c4450c8c67621590de6719
Autor:
Tina Lüdecke, Jennifer N. Leichliter, Vera Aldeias, Marion K. Bamford, Dora Biro, David R. Braun, Cristian Capelli, Jonathan D. Cybulski, Nicolas N. Duprey, Maria J. Ferreira da Silva, Alan D. Foreman, Jörg M. Habermann, Gerald H. Haug, Felipe I. Martínez, Jacinto Mathe, Andreas Mulch, Daniel M. Sigman, Hubert Vonhof, René Bobe, Susana Carvalho, Alfredo Martínez-García
Publikováno v:
Frontiers in Ecology and Evolution, Vol 10 (2022)
The analyses of the stable isotope ratios of carbon (δ13C), nitrogen (δ15N), and oxygen (δ18O) in animal tissues are powerful tools for reconstructing the feeding behavior of individual animals and characterizing trophic interactions in food webs.
Externí odkaz:
https://doaj.org/article/a4fc16af692d4f0bbf56896caa8f409f
Autor:
Alfredo Martínez‐García, Jonathan Jung, Xuyuan E. Ai, Daniel M. Sigman, Alexandra Auderset, Nicolas N. Duprey, Alan Foreman, François Fripiat, Jennifer Leichliter, Tina Lüdecke, Simone Moretti, Tanja Wald
Publikováno v:
Geochemistry, Geophysics, Geosystems, Vol 23, Iss 8, Pp n/a-n/a (2022)
Abstract Fossil‐bound organic material holds great potential for the reconstruction of past changes in nitrogen (N) cycling. Here, with a series of laboratory experiments, we assess the potential effect of oxidative degradation, fossil dissolution,
Externí odkaz:
https://doaj.org/article/6263d79b02e1498a81c813ab8e8acead
Autor:
Julia Gottschalk, Elisabeth Michel, Lena M. Thöle, Anja S. Studer, Adam P. Hasenfratz, Nicole Schmid, Martin Butzin, Alain Mazaud, Alfredo Martínez-García, Sönke Szidat, Samuel L. Jaccard
Publikováno v:
Nature Communications, Vol 11, Iss 1, Pp 1-14 (2020)
A Southern Ocean influences on the carbon cycle is considered a key component of deglacial changes. Here, the authors show spatial differences in glacial Southern Ocean carbon storage that dissipated rapidly 14.6 kyr ago, revealing a South Indian Oce
Externí odkaz:
https://doaj.org/article/3e96362855ad4cbab64fcf7a8b73941c