Results 31 to 40 of about 1,418 (187)

Evaluation of geochemical data by two different XRF spectrometers in sediments from the Santiaguillo Basin (state of Durango, Mexico)

Geofísica Internacional, 2017
La espectrometría de Fluorescencia de Rayos-X (FRX) es uno de los métodos más usados para medir datos geoquímicos y aplica técnicas tanto destructivas como no destructivas en la preparación de muestras.
Jesús David Quiroz-Jiménez, Priyadarsi D. Roy   +1 more
doaj   +1 more source

Spatial distribution of organic matter in the surface sediments of Ubatuba Bay (Southeastern - Brazil)

Anais da Academia Brasileira de Ciências, 2003
Analyses of organic matter content, organic carbon, nitrogen, sulfur and granulometric variables were performed on 101 surface sediment samples from Ubatuba Bay in order to investigate the spatial distribution of organic matter, its origin and the ...
LETICIA BURONE, PABLO MUNIZ, ANA MARIA S. PIRES-VANIN, MARCELO RODRIGUES   +3 more
doaj   +1 more source

Structured machine learning modeling to support conservation of deep‐sea benthic biodiversity

Conservation Biology, Volume 40, Issue 4, August 2026.
Abstract Biodiversity monitoring programs need to deliver accurate, timely, and actionable predictions. To establish a predictive monitoring program for deep‐sea benthos of the Santos Basin, Brazil, we developed a two‐stage structured model that allowed comparison of biodiversity predictions obtained from environmental simulations (2M‐Sim).
Gustavo Fonseca, Danilo C. Vieira, Juliane C. Carneiro, Renato S. Carreira, Milena Ceccopieri, Thais N. Corbisier, Adriana Galindo Dalto, Alberto G. Figueiredo Jr., Fabiane Gallucci, Paula Gheller, Simone Brito de Jesus, Helena Passeri Lavrado, Letícia Lazzari, Eduardo Hilzendeger Marcon, Daniel Leite Moreira, Rafael Bendayan de Moura, Ellen Pape, Ana Cláudia Aoki Santarosa, João Regis dos Santos Filho, Silvia Helena de Mello e Sousa, Thaisa Marques Vicente, Luciana Erika Yaginuma, Cinthia Yamashita, Wandrey Watanabe   +23 more
wiley   +1 more source

The influence of hydrological seasonality and land use and cover on the relationship between dissolved organic carbon and carbon dioxide along a karst‐draining large tropical river

Limnology and Oceanography, Volume 70, Issue 10, Page 2858-2871, October 2025.
Abstract The partial pressure of carbon dioxide (pCO2) in rivers is influenced by carbonate weathering, soil CO2, photosynthesis, and the mineralization of dissolved organic carbon (DOC). In tropical regions, elevated temperatures intensify these processes. However, their seasonal dynamics remain poorly understood in large karst‐draining rivers.
Daniel Cuevas‐Lara, Javier Alcocer, Felipe García‐Oliva, Salvador Sánchez‐Carrillo, Ismael Soria‐Reinoso, Luis A. Oseguera   +5 more
wiley   +1 more source

Incorporating cyclone risk in the design of marine protected and conserved areas as an ecosystem‐based adaptation approach

Conservation Biology, Volume 39, Issue 4, August 2025.
Abstract Marine protected and conserved areas (MPCAs) are promoted as an ecosystem‐based adaptation (EbA) approach to increase community and ecosystem resilience to climate change. However, traditional approaches to MPCA design typically do not consider climate risk or habitat condition under a climate threat.
Alyssa L. Giffin, Vivitskaia J. D. Tulloch, Dominic A. Andradi‐Brown, Rod M. Connolly, Unaisi Malani‐Tagicakibau, Francis Areki, Christopher J. Brown   +6 more
wiley   +1 more source

Monitoring mosaic biotopes in a marine conservation zone by autonomous underwater vehicle

Conservation Biology, Volume 33, Issue 5, Page 1174-1186, October 2019., 2019
Abstract The number of marine protected areas (MPAs) has increased dramatically in the last decade and poses a major logistic challenge for conservation practitioners in terms of spatial extent and the multiplicity of habitats and biotopes that now require assessment. Photographic assessment by autonomous underwater vehicle (AUV) enables the consistent
Noëlie M.A. Benoist, Kirsty J. Morris, Brian J. Bett, Jennifer M. Durden, Veerle A.I. Huvenne, Tim P. Le Bas, Russell B. Wynn, Suzanne J. Ware, Henry A. Ruhl   +8 more
wiley   +1 more source

Bioassay using Daphnia magna Straus, 1820 to evaluate the sediment of Caí River (Rio Grande do Sul, Brazil) Bioensaios utilizando Daphnia magna Straus, 1820 na avaliação do sedimento do rio Caí (Rio Grande do Sul, Brasil)

Acta Limnologica Brasiliensia, 2010
AIM: The Caí River is one of the five that form the Guaiba Lake Hydrographic Basin. It is used for public water supply in the capital of Rio Grande do Sul; METHODS: Sediment samples for toxicity test (21 days) with Daphnia magna were taken from four ...
Nara Regina Terra, Ilda Rosa Feiden, Fabiane Lucheta, Silvana Pereira Gonçalves, Juliana Schons Gularte   +4 more
doaj   +1 more source

Características físicas de sedimentos e solos de dois lagos de várzea na Amazônia Central [PDF]

Acta Amazonica, 1999
O regime hidrológico de nível de água baixo e alto torna as várzeas suscetíveis a alterações ecológicas, tanto nos solos quanto nos lagos. No período de nível de água alto, as várzeas são “fertilizadas” pelo sedimento cm suspensão que é depositado ...
Sávio José Filgueiras FERREIRA, Klaus REICHARDT, Sebastião Átila Fonseca MIRANDA   +2 more
doaj   +1 more source

Carbon dynamics in high‐Andean tropical cushion peatlands: A review of geographic patterns and potential drivers

Ecological Monographs, Volume 94, Issue 3, August 2024.
Abstract Peatlands store large amounts of carbon (C), a function potentially threatened by climate change. Peatlands composed of vascular cushion plants are widespread in the northern and central high Andes (páramo, wet and dry puna), but their C dynamics are hardly known.
Mary Carolina García Lino, Simon Pfanzelt, Alejandra I. Domic, Isabell Hensen, Karsten Schittek, Rosa Isela Meneses, Maaike Y. Bader   +6 more
wiley   +1 more source

Rainfall and Hydrograph Styles in Ephemeral Streams of the Drylands of Patagonia (South America–Argentina)

Water Resources Research, Volume 60, Issue 8, August 2024.
Abstract Ephemeral streams in dry environments can convey high intensity sediment‐laden flash floods. The study of these events is quite difficult due to remote locations with limited accessibility, unexpected events, rough weather conditions and safety concerns.
Gabriel Kaless, Héctor Malnero, Oscar Frumento, Miguel Pascual   +3 more
wiley   +1 more source