Results 41 to 50 of about 210,419 (221)

Syrinx anatomy and vocalizations in New World vultures (Aves: Cathartidae): Implications for avian vocal evolution

open access: yesJournal of Anatomy, EarlyView.
New World vultures are the only avian clade proposed to lack a syrinx and have been described as non‐vocal. Using dissection, diceCT, and histology, we demonstrate that cathartid vultures have novel syringeal features that form a syrinx and vocal characterization reveals that they produce more complex vocalizations than previously reported.
Bradley A. Ibarra   +3 more
wiley   +1 more source

Subsistence hunting shapes the spatial variation of jaguar densities in community‐managed forests

open access: yesJournal of Zoology, EarlyView.
Jaguars and people can coexist in community‐managed forests, but distance matters. In Guatemala's Maya Biosphere Reserve, jaguar numbers increased markedly in areas harder to reach on foot, yet jaguars were still found near communities, showing that responsibly managed forests can support jaguar populations while allowing people to maintain traditional
L. Perera‐Romero   +5 more
wiley   +1 more source

Environmental Justice in the Brazilian Coastal Food Systems: Policies, Institutions, and Knowledges on Small‐Scale Fishers and Energy Development

open access: yesWorld Food Policy, Volume 12, Issue 2, November 2026.
ABSTRACT This study explores environmental justice issues in coastal food systems, focusing on conflicts between small‐scale fisheries and the energy sector due to differing goals in managing food and energy sources. It does so by examining the interdependence between institutions, policies, and different types of knowledge; key elements in building ...
Mateus Henrique Amaral   +6 more
wiley   +1 more source

Continental‐wide prioritization of protected areas to address global and habitat‐specific goals for avian biodiversity conservation

open access: yesConservation Biology, Volume 40, Issue 5, October 2026.
Abstract The United Nations and European Union have set ambitious conservation goals to halt and reverse declines in biodiversity by protecting 30% of land and sea areas by 2030. Effective conservation planning requires evidence‐based spatial prioritization to maximize the coverage of species within designated protected areas.
Yanjie Xu   +33 more
wiley   +1 more source

Assessing responses of reef island seabirds to environmental and anthropogenic drivers

open access: yesConservation Biology, Volume 40, Issue 5, October 2026.
Abstract Tropical insular ecosystems face escalating, cumulative impacts of land‐ and sea‐based ecological threats that jeopardize the long‐term sustainability of their native communities. This joint vulnerability is epitomized by reef island seabirds, which are exposed to reef decline and coastal erosion driven by climate change, reduction in prey ...
Tristan Berr   +7 more
wiley   +1 more source

Costos funcionales

open access: yesEstudios económicos, 1950
Costos ...
openaire   +3 more sources

Diseño de una columna empacada y una torre de bandejas perforadas para la absorción de etanol. 1. Diseño de la columna empacada

open access: yesMutis, 2019
En el presente trabajo se llevó a cabo el diseño de una columna empacada para efectuar la absorción de etanol contenido en una corriente gaseosa usando agua como solvente. Como material de empaque se seleccionó anillos plásticos Nor-Pac® de 35 mm.
Amaury Pérez Sánchez   +2 more
doaj   +1 more source

Identifying hotspots of faunal data deficiency to direct urgent research and monitoring

open access: yesConservation Biology, Volume 40, Issue 5, October 2026.
Abstract Data deficiency is a substantial challenge for extinction risk assessments because incomplete data means we cannot accurately identify priority protected areas for conservation. Here, we use the International Union for Conservation of Nature (IUCN) distributions of amphibians, sharks and rays, fish, mammals, birds, and reptiles to identify ...
Matt W. Hayward   +4 more
wiley   +1 more source

El costo de capital [PDF]

open access: yes, 2011
Un factor clave de la teoría financiera radica en que cualquier uso que se le dé al dinero involucra la renuncia del retorno de un activo específico a cambio del rendimiento mayor que generará otro proyecto de inversión de igual riesgo; deduciéndose que ...
Venavides Trejo, Jorge Antonio
core   +1 more source

Optimal Contact, Negative Stereotypes, and Teachers' Intercultural Self‐Efficacy: A Mediation Model in Colombian In‐Service Teachers

open access: yesJournal of Applied Social Psychology, Volume 56, Issue 10, Page 756-765, October 2026.
ABSTRACT Teachers' intercultural self‐efficacy remains central to fostering inclusive practices in culturally diverse classrooms. Despite its educational relevance, few studies have examined relational and cognitive mechanisms underlying this perceived competence, particularly in Latin American contexts. Drawing on intergroup contact theory, this study
Catalina Argüello‐Gutiérrez   +3 more
wiley   +1 more source

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