Results 231 to 240 of about 196,961 (299)

Confirming the impact origin of the São Miguel do Tapuio structure, northeastern Brazil

open access: yesMeteoritics &Planetary Science, EarlyView.
Abstract The São Miguel do Tapuio structure (SMT) is a remarkable, nearcircular feature of about 21 km diameter, centered at 5°37.6′ S, 41°23.3′ W in Piauí state, northeastern Brazil. The structure is located within the sedimentary strata of the Paleozoic–Mesozoic Parnaíba Basin and predominantly comprises sandstones of the Devonian Pimenteiras and ...
Alvaro Penteado Crósta   +9 more
wiley   +1 more source

Geophysical investigation of the Santa Marta impact structure—Piauí State, Brazil

open access: yesMeteoritics &Planetary Science, EarlyView.
Abstract The Santa Marta impact structure in northeastern Brazil, recognized as a partially preserved complex crater, was investigated through an integrated geophysical study employing magnetotelluric (MT) and gravity methods. Our research provides constraints on the crater's subsurface architecture.
Elienara Vasconcelos   +5 more
wiley   +1 more source

Araguainha Dome, Brazil: A polygonal impact structure due to a complex pre‐impact regional structural framework

open access: yesMeteoritics &Planetary Science, EarlyView.
Abstract We investigated the structural framework of the north–northwestern Paraná Basin in Brazil to test whether the pre‐impact structures in this region may have had any influence on the first‐order formation and morphostructure of the Araguainha impact structure (AIS).
Renato B. Bernardes   +5 more
wiley   +1 more source

Iran's Forward Defense in Sub‐Saharan Africa

open access: yesMiddle East Policy, EarlyView.
Abstract This article examines Iran's security and defense initiatives in sub‐Saharan Africa between 1990 and 2024 and how they reflect the extraterritorial application of the regime's forward defense doctrine. In response to the long‐term erosion of its homeland defense capabilities since the Iran‐Iraq War of the 1980s—driven by infrastructure ...
Ariel Limanya Limbu, Ronen A. Cohen
wiley   +1 more source

Speaking to Power: How Linguistic Minority Accents Shape Voter Perceptions of Party Leaders

open access: yesNations and Nationalism, EarlyView.
ABSTRACT In multilingual countries, does the way minority group members speak the majority language hinder their chances of attaining the highest political office? Can their accent undermine their claim to represent all citizens? Is it associated with certain stereotypes?
Florence Laflamme, Philippe Chassé
wiley   +1 more source

Sponges survive and develop infaunal snapping shrimp communities when transplanted immediately after clonal propagation: implications for restoration

open access: yesRestoration Ecology, EarlyView.
Abstract Introduction Sponges historically dominated the heterotrophic biomass of Florida Bay's hard‐bottom habitat, providing crucial ecosystem services including shelter for soniferous shrimp that contribute to the marine soundscape. The loss of the sponge communities has inspired restoration efforts using in‐water nurseries for vegetative ...
William C. Sharp   +4 more
wiley   +1 more source

Diet composition of the Red‐billed curassow (Crax blumenbachii) and its role as seed disperser in the Atlantic Forest: conservation insights

open access: yesRestoration Ecology, EarlyView.
Abstract Introduction Forest fragmentation and defaunation are major drivers of biodiversity loss in the Atlantic Forest of Brazil, where 70–90% of tree species depend on animal‐mediated seed dispersal. Reintroduction of large frugivores, such as cracids, is being used to restore species populations and lost ecological functions.
Maria P. M. X. Rufino   +9 more
wiley   +1 more source

Tree‐Ring Oxygen Isotope Values During the Last Glacial Maximum and Insights to Future Changes in Climate

open access: yesTerra Nova, EarlyView.
ABSTRACT Annual tree‐ring oxygen‐isotope values were measured from sections of two fossil logs of Picea mariana (black spruce) recovered from last glacial maximum proglacial sediment in Illinois, USA. Collectively, the specimens date from ca. 25,130 to 24,720 cal years BP.
Dana M. Labotka   +2 more
wiley   +1 more source

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