نتایج جستجو برای: phenological

تعداد نتایج: 3985  

Journal: :Trends in ecology & evolution 2017
Charles G Willis Elizabeth R Ellwood Richard B Primack Charles C Davis Katelin D Pearson Amanda S Gallinat Jenn M Yost Gil Nelson Susan J Mazer Natalie L Rossington Tim H Sparks Pamela S Soltis

The timing of phenological events, such as leaf-out and flowering, strongly influence plant success and their study is vital to understanding how plants will respond to climate change. Phenological research, however, is often limited by the temporal, geographic, or phylogenetic scope of available data. Hundreds of millions of plant specimens in herbaria worldwide offer a potential solution to t...

2013
Philippa Gullett Ben J Hatchwell Robert A Robinson Karl L Evans

Climate change-induced shifts in phenology have important demographic consequences, and are frequently used to assess species' sensitivity to climate change. Therefore, developing accurate phenological predictions is an important step in modeling species' responses to climate change. The ability of such phenological models to predict effects at larger spatial and temporal scales has rarely been...

2010
Jan Verbesselt Rob Hyndman Achim Zeileis Darius Culvenor

A challenge in phenology studies is understanding what constitutes phenological change amidst background variation. The majority of phenological studies have focussed on extracting critical points in the seasonal growth cycle, without exploiting the full temporal detail. The high degree of phenological variability between years demonstrates the necessity of distinguishing long term phenological...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2017
Jacob B Socolar Peter N Epanchin Steven R Beissinger Morgan W Tingley

Species respond to climate change in two dominant ways: range shifts in latitude or elevation and phenological shifts of life-history events. Range shifts are widely viewed as the principal mechanism for thermal niche tracking, and phenological shifts in birds and other consumers are widely understood as the principal mechanism for tracking temporal peaks in biotic resources. However, phenologi...

2010
G. Darrel Jenerette Russell L. Scott Alfredo R. Huete

Questions: We asked several linked questions about phenology and precipitation relationships at local, landscape, and regional spatial scales within individual seasons, between seasons, and between year temporal scales. (1) How do winter and summer phenological patterns vary in response to total seasonal rainfall? (2) How are phenological rates affected by the previous season rainfall? (3) How ...

Journal: :The New phytologist 2017
Charles G Willis Edith Law Alex C Williams Brian F Franzone Rebecca Bernardos Lian Bruno Claire Hopkins Christian Schorn Ella Weber Daniel S Park Charles C Davis

Phenology is a key aspect of plant success. Recent research has demonstrated that herbarium specimens can provide important information on plant phenology. Massive digitization efforts have the potential to greatly expand herbarium-based phenological research, but also pose a serious challenge regarding efficient data collection. Here, we introduce CrowdCurio, a crowdsourcing tool for the colle...

2014
Ellen G. Denny Katharine L. Gerst Abraham J. Miller-Rushing Geraldine L. Tierney Theresa M. Crimmins Carolyn A. F. Enquist Patricia Guertin Alyssa H. Rosemartin Mark D. Schwartz Kathryn A. Thomas Jake F. Weltzin

Phenology offers critical insights into the responses of species to climate change; shifts in species' phenologies can result in disruptions to the ecosystem processes and services upon which human livelihood depends. To better detect such shifts, scientists need long-term phenological records covering many taxa and across a broad geographic distribution. To date, phenological observation effor...

2013
Nicole E Rafferty Paul J CaraDonna Laura A Burkle Amy M Iler Judith L Bronstein

Concern regarding the biological effects of climate change has led to a recent surge in research to understand the consequences of phenological change for species interactions. This rapidly expanding research program is centered on three lines of inquiry: (1) how the phenological overlap of interacting species is changing, (2) why the phenological overlap of interacting species is changing, and...

2009
Nicholas S. Fabina Karen C. Abbott R.Tucker Gilman

For many species in seasonal environments, warmer springs associated with anthropogenic climate change are causing phenological changes. Within ecological communities, the timing of interactions among species may be altered if the species experience asymmetrical phenological shifts. We present a model that examines the consequences of changes in the relative timing of herbivory and pollination ...

Journal: :Remote Sensing 2013
Cornelius Senf Dirk Pflugmacher Sebastian van der Linden Patrick Hostert

We developed and evaluated a new approach for mapping rubber plantations and natural forests in one of Southeast Asia’s biodiversity hot spots, Xishuangbanna in China. We used a one-year annual time series of Moderate Resolution Imaging Spectroradiometer (MODIS), Enhanced Vegetation Index (EVI) and short-wave infrared (SWIR) reflectance data to develop phenological metrics. These phenological m...

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