نتایج جستجو برای: phenology

تعداد نتایج: 6635  

2018
Jennifer A Sheridan Nicholas M Caruso Joseph J Apodaca Leslie J Rissler

Changes in body size and breeding phenology have been identified as two major ecological consequences of climate change, yet it remains unclear whether climate acts directly or indirectly on these variables. To better understand the relationship between climate and ecological changes, it is necessary to determine environmental predictors of both size and phenology using data from prior to the o...

2014
Shuli Niu Yuling Fu Lianhong Gu Yiqi Luo

Northern Hemisphere terrestrial ecosystems have been recognized as areas with large carbon uptake capacity and sinks and are sensitive to temperature change. However, the temperature sensitivity of ecosystem carbon uptake phenology in different biomes of northern ecosystems has not been well explored. In this study, based on our previous effort in characterizing canopy photosynthesis phenology ...

Journal: :Remote Sensing 2016
Andrew James Elmore Cathlyn D. Stylinski Kavya Pradhan

Abstract: There is great potential value in linking geographically dispersed multitemporal observations collected by lay volunteers (or “citizen scientists”) with remotely-sensed observations of plant phenology, which are recognized as useful indicators of climate change. However, challenges include a large mismatch in spatial scale and diverse sources of uncertainty in the two measurement type...

2011
Koen Hufkens Mark Friedl Oliver Sonnentag Bobby H. Braswell Thomas Milliman Andrew D. Richardson

a r t i c l e i n f o Green leaf phenology is known to be sensitive to climate variation. Phenology is also important because it exerts significant control on terrestrial carbon cycling and sequestration. High-quality measurements of green leaf phenology are therefore increasingly important for understanding the effects of climate change on ecosystem function and biosphere–atmosphere interactio...

2011
JESSICA R. K. FORREST JAMES D. THOMSON

One possible effect of climate change is the generation of a mismatch in the seasonal timing of interacting organisms, owing to species-specific shifts in phenology. Despite concerns that plants and pollinators might be at risk of such decoupling, there have been few attempts to test this hypothesis using detailed phenological data on insect emergence and flowering at the same localities. In pa...

Journal: :Remote Sensing 2016
Margaret Kosmala Alycia Crall Rebecca Cheng Koen Hufkens Sandra Henderson Andrew D. Richardson

The impact of a rapidly changing climate on the biosphere is an urgent area of research for mitigation policy and management. Plant phenology is a sensitive indicator of climate change and regulates the seasonality of carbon, water, and energy fluxes between the land surface and the climate system, making it an important tool for studying biosphere–atmosphere interactions. To monitor plant phen...

2014
Mark A. Hurley Mark Hebblewhite Jean-Michel Gaillard Stéphane Dray Kyle A. Taylor W. K. Smith Pete Zager Christophe Bonenfant

Large herbivore populations respond strongly to remotely sensed measures of primary productivity. Whereas most studies in seasonal environments have focused on the effects of spring plant phenology on juvenile survival, recent studies demonstrated that autumn nutrition also plays a crucial role. We tested for both direct and indirect (through body mass) effects of spring and autumn phenology on...

2015
Christopher W. Kopp Elsa E. Cleland Sylvain Delzon

Shifts in plant species phenology (the timing of life-history events such as flowering) have been observed worldwide in concert with rising global temperatures. While most species display earlier phenology with warming, there is large variation among, and even within, species in phenological sensitivity to rising temperatures. Other indirect effects of climate change, such as shifting species c...

2012
C. R. Chen C. F. Chen N. T. Son

Information on rice crop phenology is important for crop management. This study aimed to detect rice crop phenology in the Vietnamese Mekong Delta using time-series MODIS data in 2007. Data processing steps included: (1) constructing time-series MODIS NDVI data, (2) filtering noise from the time-series data using empirical mode decomposition (EMD) and wavelet transform, (3) detecting rice crop ...

Journal: :Proceedings. Biological sciences 2011
Paul-Camilo Zalamea François Munoz Pablo R Stevenson C E Timothy Paine Carolina Sarmiento Daniel Sabatier Patrick Heuret

Plant phenology is concerned with the timing of recurring biological events. Though phenology has traditionally been studied using intensive surveys of a local flora, results from such surveys are difficult to generalize to broader spatial scales. In this study, contrastingly, we assembled a continental-scale dataset of herbarium specimens for the emblematic genus of Neotropical pioneer trees, ...

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