Výsledky vyhledávání - "Weltzin, Jake"

Akademický článek

USA National Phenology Network's volunteer-contributed observations yield predictive models of phenological transitions

Autor: Crimmins, Theresa M., Crimmins, Michael A., Gerst, Katharine L., Rosemartin, Alyssa H., Weltzin, Jake F.

Purpose In support of science and society, the USA National Phenology Network (USA-NPN) maintains a rapidly growing, continental-scale, species-rich dataset of plant and animal phenology observations that with over 10 million records is the largest s

Externí odkaz: http://hdl.handle.net/10150/625772
http://arizona.openrepository.com/arizona/handle/10150/625772

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Akademický článek

Restoring monarch butterfly habitat in the Midwestern US: 'all hands on deck'

The eastern migratory population of monarch butterflies (Danaus plexippus plexippus) has declined by >80% within the last two decades. One possible cause of this decline is the loss of >= 1.3 billion stems of milkweed (Asclepias spp.), which monarchs

Externí odkaz: http://hdl.handle.net/10150/624923
http://arizona.openrepository.com/arizona/handle/10150/624923

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Akademický článek

Climate change is advancing spring onset across the U.S. national park system

Autor: Monahan, William B., Rosemartin, Alyssa, Gerst, Katharine L., Fisichelli, Nicholas A., Ault, Toby, Schwartz, Mark D., Gross, John E., Weltzin, Jake F.

Many U.S. national parks are already at the extreme warm end of their historical temperature distributions. With rapidly warming conditions, park resource management will be enhanced by information on seasonality of climate that supports adjustments

Externí odkaz: http://hdl.handle.net/10150/622065
http://arizona.openrepository.com/arizona/handle/10150/622065

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Akademický článek

The plant phenology monitoring design for The National Ecological Observatory Network

Autor: Elmendorf, Sarah C., Jones, Katherine D., Cook, Benjamin I., Diez, Jeffrey M., Enquist, Carolyn A. F., Hufft, Rebecca A., Jones, Matthew O., Mazer, Susan J., Miller-Rushing, Abraham J., Moore, David J. P., Schwartz, Mark D., Weltzin, Jake F.

Phenology is an integrative science that comprises the study of recurring biological activities or events. In an era of rapidly changing climate, the relationship between the timing of those events and environmental cues such as temperature, snowmelt

Externí odkaz: http://hdl.handle.net/10150/617002
http://arizona.openrepository.com/arizona/handle/10150/617002

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Dissertation/ Thesis

Biotic and abiotic constraints on shifts in temperate savanna ecotones at lower treeline

Autor: Weltzin, Jake Frederick, 1964

In contrast to documented increases in woody plant dominance of former savannas and grasslands of North America, oak (Quercus L.) savannas that form lower treelines in the southwestern United States and northwestern Mexico have been relatively stable

Externí odkaz: http://hdl.handle.net/10150/288779

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