Mi lista de blogs

sábado, 10 de septiembre de 2016

NSF: Discovery .- Seasonality of bird migration responds to environmental cues, scientists show.- Los científicos muestran que la estacionalidad de la migración de las aves responde a señales del medio ambiente

http://www.nsf.gov/discoveries/disc_summ.jsp?cntn_id=189610&WT.mc_id=USNSF_51&WT.mc_ev=click
La estacionalidad de la migración de las aves está cambiando en respuesta al cambio climático. Como resultado, las aves en los Estados Unidos están llegando a sus lugares de cría del norte a principios de la primavera - y pueden partirán más tarde en el otoño.
Los científicos apoyados por la National Science Foundation (NSF) realizan el seguimiento de  la migración y el  descubrimiento de desplazamiento gracias a la información agregada de dos fuentes: los datos de teledetección radar de vigilancia de tiempo y los datos basados en tierra recogidas en las bases de datos de ciencia ciudadana.

Data from weather radar and ground-based citizen science projects yield new insights
Biologists and atmospheric scientists track migrating birds like this summer tanager.

Biologists and atmospheric scientists track migrating birds like this summer tanager.

September 6, 2016
The seasonality of bird migration is shifting in response to climate change. As a result, birds in the United States are arriving at their northern breeding grounds earlier in spring -- and may be departing later in fall.
Scientists supported by the National Science Foundation (NSF) made the migration shift discovery thanks to information aggregated from two sources: remote-sensing data from weather surveillance radar and ground-based data collected in citizen science databases.
 
Biology meets atmospheric science
 
Working with atmospheric scientists, biologists demonstrated that the combination of data yielded robust migration timing indexes.
The indexes reflect the movements of millions of birds of many species over large regions, says biologist Jeff Kelly of the University of Oklahoma, lead author of a paper describing the team's results in the journal Ecosphere, published by the Ecological Society of America.
"Understanding which environmental cues link migration timing to patterns of global change is key to forecasting future responses," Kelly said. "Novel data sources like the weather surveillance radar network and citizen science databases are enabling development of an index of migration phenology [cyclic or seasonal natural phenomena] that can be used to answer this question in future studies."
The combination of two novel data sources provides new insights into how, and when, migrations occur.
"These scientists combined citizen science observations with data from radar, satellites and weather predictions to understand the cues birds use in their migrations across continents," says Liz Blood, program director in NSF's Division of Environmental Biology, which funded the research through NSF's MacroSystems Biology Program. "The results show that birds migrate in time with temperature changes and with seasonal changes in the landscape."
 
Migration cues
 
Researchers say the migration indexes can help address a gap in scientists' knowledge about the cues birds use to fine-tune migration timing in response to climate.
They found that temperature likely plays a role in how migrating birds make adjustments in their timing and their routes. The researchers' findings also contradict the idea that a commonly used index of vegetation greenness is a useful cue for migration timing in some locales.
Results of the study, conducted in the eastern United States, expand on more traditional measures of migration timing based on a few individuals of a particular species.
Collaborators on the research include Todd Fagin and Eli Bridge of the Oklahoma Biological Survey; Kyle Horton, Phillip Chilson and Kirsten de Beurs of the University of Oklahoma; and Phillip Stepanian, formerly with the Advanced Radar Research Center.
The U.S. Department of Agriculture provided additional funding for the project.
-- Cheryl Dybas, NSF (703) 292-7734 cdybas@nsf.gov
-- Jana Smith, University of Oklahoma (405) 325-1322 jana.smith@ou.edu
-- Liza Lester, Ecological Society of America (202) 833-8773 llester@esa.org


Investigators Eli Bridge
Le Gruenwald
Jeffrey Kelly
Phillip Chilson
Valliappa Lakshmanan
Related Institutions/Organizations University of Oklahoma Norman Campus
Total Grants $301,641
Related WebsitesScientists track nighttime bird migration using weather radar:
Prothonotary warblers may migrate over distances as great as 5,000 miles or more.
Prothonotary warblers may migrate over distances as great as 5,000 miles or more.
Credit and Larger Version
Indigo buntings often migrate by night, using the stars to navigate.
Indigo buntings often migrate by night, using the stars to navigate.
Credit and Larger Version
Black-throated green warblers migrate south to Mexico, Central America, West Indies and Florida.
Black-throated green warblers migrate south to Mexico, Central America, West Indies and Florida.
Credit and Larger Version
Chestnut-sided warblers migrate mostly by night. Peak fall migration is in September.
Chestnut-sided warblers migrate mostly by night. Peak fall migration is in September.
Credit and Larger Version
Green herons may migrate from the northern U.S. as far south as Panama and South America.
Green herons may migrate from the northern U.S. as far south as Panama and South America.
Credit and Larger Version
The National Science Foundation (NSF)
Guillermo Gonzalo Sánchez Achutegui
ayabaca@gmail.com
ayabaca@hotmail.com
ayabaca@yahoo.com
Inscríbete en el Foro del blog y participa : A Vuelo De Un Quinde - El Foro!