Results 71 to 80 of about 44,311 (140)

Pollinator efficiency, rather than bee decline, explains a shift to hummingbird pollination in tropical montane forests

open access: yesNew Phytologist, Volume 251, Issue 4, Page 2237-2247, August 2026.
Hummingbird pollination is a hallmark of American plant diversity and has long been thought to evolve in tropical mountains due to declining bee activity. Using sister species of Costus specialized on bees (C. kuntzei) and hummingbirds (C. wilsonii), we show that this shift is not driven by reduced bee visitation with elevation, but by greater ...
Pedro Juárez   +7 more
wiley   +1 more source

Locally adapted Arabidopsis thaliana accessions show transcriptomic plasticity in a multi‐timescale analysis of whole‐genome gene expression in a natural environment

open access: yesPlant Biology, Volume 28, Issue 5, Page 1641-1656, August 2026.
Natural Arabidopsis thaliana accessions showed remarkable plasticity in both life‐cycle phenology and whole‐genome gene expression patterns in in natura field experiments. Nevertheless, local adaptation in fitness‐related life‐history traits can also be detected at the whole‐genome gene expression level.
A. Martínez‐Pérez   +8 more
wiley   +1 more source

Meiosis and fluorescent banding in Edessa meditabunda and E. rufomarginata (Heteroptera: Pentatomidae: Edessinae)

open access: yesEuropean Journal of Entomology, 2003
Species of Pentatomidae are cytogenetically characterized by the presence of holokinetic chromosomes, a pre-reductional type of meiosis, and a great constancy not only in chromosome number (2n = 14 in 85% of the 250 species analyzed) but also in the sex ...
Pablo J. REBAGLIATI   +2 more
doaj   +1 more source

Evolución de modelos de negocio: Hacia una visión de la estrategia en términos de coherencia dinámica

open access: yesRevista Galega de Economía, 2014
Este artículo empieza con una paradoja. Los modelos de negocio normalmente se asocian con cambio – especialmente cambio radical – pero a menudo el concepto se utiliza de forma estática para describir el modelo de negocio de una empresa. Después de aportar nuestra definición de modelo de negocio como combinación de recursos y competencias ...
openaire   +1 more source

Evolución de la estrategia y la estructura de la gran empresa española: Análisis comparado con la evidencia europea

open access: yesRevista Galega de Economía, 2014
Este trabajo analiza la evolución de la estrategia corporativa y la estructura organizativa de 100 de los mayores grupos empresariales españoles durante el período 1993-2003, con el fin de ofrecer una comparación con otros contextos. Los resultados muestran que la tendencia es similar a la observada en Europa, aunque en España todavía es menos ...
openaire   +1 more source

Primeros registros del colibrí aliazul, Pterophanes cyanopterus (Fraser,1839), (Apodiformes, Trochilidae) en el departamento de Antioquia, Colombia

open access: yesBiota Colombiana, 2018
Se registra por primera vez al colibrí aliazul (Pterophanes cyanopterus) en el departamento de Antioquia, en dos localidades del municipio de Sonsón (Cerro Las Palomas y Cerro La Vieja) ampliando la distribución de la especie 66 km hacia el norte en la ...
Sergio Chaparro-Herrera   +3 more
doaj   +1 more source

Slow recovery rates and spatial aggregation of Triatoma infestans populations in an area with high pyrethroid resistance in the Argentine Chaco

open access: yesParasites & Vectors
Background The emergence of pyrethroid resistance has threatened the elimination of Triatoma infestans from the Gran Chaco ecoregion. We investigated the status and spatial distribution of house infestation with T.
María Carla Cecere   +8 more
doaj   +1 more source

Temperature changes reveal different transcriptional responses in the larvae of the bark beetle Dendroctonus rhizophagus during the cold season

open access: yesScientific Reports
Bark beetle, Dendroctonus rhizophagus, colonises and kills healthy sapling pine trees in the Sierra Madre Occidental, Mexico. In the autumn, its fifth-instar larvae migrate to the host’s roots (hibernaculum) to overwinter; however, little is known about ...
Moises Becerril   +6 more
doaj   +1 more source

Estudio morfométrico de la diferenciación en Acacia bonariensis y Acacia caven var. caven (Fabaceae) en dos reservas naturales

open access: yesBoletín de la Sociedad Argentina de Botánica, 2021
Introducción y objetivos El género Acacia (Fabaceae) es de distribución pantropical y actualmente está compuesto por, aproximadamente, 1.450 especies en todo el mundo.
Carolina Luciana Pometti   +2 more
doaj  

A Taphonomic Study of DS-22A (Bed I, Olduvai Gorge) and Its Implications for Reconstructing Hominin-Carnivore Interactions at Early Pleistocene Anthropogenic Sites

open access: yesQuaternary
The longstanding debate over early hominin subsistence strategies, particularly the hunting-versus-scavenging hypothesis, as well as discussions regarding the functionality of Oldowan sites, has been primarily centered on the archeological and ...
Blanca Jiménez-García   +3 more
doaj   +1 more source

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