Results 51 to 60 of about 281,504 (276)
Conservation Biology, EarlyView.Abstract Accelerated biodiversity loss has destabilized functional links within and between ecosystems. Species that cross different ecosystems during migration between breeding and nonbreeding sites are particularly sensitive to global change because they are exposed to various, often ecosystem‐specific, threats.
Lucy Mitchell +10 more
wiley +1 more source
Norteamérica, 2017 Este artículo analiza la consolidación de la migración irregular en Estados Unidos en la historia. Primero, se revisan las leyes y políticas de control de la migración emitidas desde los inicios de la regulación de la migración.
Elisa Ortega Velázquez
doaj +1 more source
La migración temporal entre Marruecos y España [PDF]
, 2011 La gestión española de la migración temporal desde Marruecos se ha convertido en un modelo que las instituciones europeas y los organismos internacionales presentan como un éxito a imitar.
González Enríquez, Carmen
core
Assessing the Corn Belt as an anthropogenic barrier to migrating landbirds in the United States
Conservation Biology, EarlyView.Abstract Migrating landbirds adjust their flight and stopover behaviors to efficiently cross inhospitable geographies, such as the Gulf of Mexico and the Sahara Desert. In addition to these natural barriers, birds may increasingly encounter anthropogenic barriers created by large‐scale changes in land use. One such barrier could be the Corn Belt in the
Fengyi Guo +7 more
wiley +1 more source
Colombia Internacional, 2020 Objetivo/contexto: si bien la idea de “migracion ordenada” tiene mas de medio siglo, recientemente ha cobrado notoriedad internacional gracias a su insercion en el Global Compact for Migration de 2...
Silvana Santi
semanticscholar +1 more source
Migración Internacional: Voces del Sur [PDF]
, 2017 Este libro busca proyectar la preocupación sobre la migración internacional en América Latina y levantar la voz desde el sur contra la edificación de muros tangibles e intangibles que los países desarrollados han construido en años recientes en relación ...
GONZALEZ BECERRIL, JUAN GABINO +5 more
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Predictions of southern migration timing in coastal sharks under future ocean warming
Conservation Biology, EarlyView.Abstract Projected redistribution of marine species due to ocean warming may undermine current conservation efforts. Yet, there have been few studies on how ocean warming may alter migration timing. Across 5 years of acoustic telemetry data (2018–2022), we determined environmental drivers of southward migration timing for 6 migratory shark species from
Maria H. Manz +16 more
wiley +1 more source
¿Quo Vadis? Reclutamiento y Contratacion de Trabajadores Migrantes y su Acceso a la Seguridad Social: dinamicas de los sistemas de trabajo temporal migratorio en Norte y Centroamerica [PDF]
, 2013 Different regions and countries of the world face a serious need to design and make use of necessary policies and resources to better manage worker migration, thus ensuring the welfare and human rights of these people who, in the end, are of benefit to ...
Alejandra Costanza, Gisele Lisa Bonnici
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Conservation Science and Practice, EarlyView.Conservation for marine megafaunal predators needs to improve as they are key for ecosystem functioning. We show that different marine predator taxonomic groups have heterogeneous distributions resulting in different spatial conservation priority areas. Current Mediterranean MPAs are failing to sufficiently cover their distributions.
Elizabeth Boyse +2 more
wiley +1 more source
Dimensiones de la migración en Colombia
, 2020 A lo largo de la historia se han presentado diversas transformaciones sociales fruto de los movimientos de poblacion. En todos los continentes y en todas las epocas, han existido migraciones humanas, motivadas por multiples causas, lo que ha dado cabida ...
F. Sáez +20 more
semanticscholar +1 more source