نتایج جستجو برای: phenological

تعداد نتایج: 3985  

Journal: :Ecology letters 2013
Ignasi Bartomeus Mia G Park Jason Gibbs Bryan N Danforth Alan N Lakso Rachael Winfree

Climate change has the potential to alter the phenological synchrony between interacting mutualists, such as plants and their pollinators. However, high levels of biodiversity might buffer the negative effects of species-specific phenological shifts and maintain synchrony at the community level, as predicted by the biodiversity insurance hypothesis. Here, we explore how biodiversity might enhan...

2016
Xine Li Lili Jiang Fandong Meng Shiping Wang Haishan Niu Amy M. Iler Jichuan Duan Zhenhua Zhang Caiyun Luo Shujuan Cui Lirong Zhang Yaoming Li Qi Wang Yang Zhou Xiaoying Bao Tsechoe Dorji Yingnian Li Josep Peñuelas Mingyuan Du Xinquan Zhao Liang Zhao Guojie Wang

Organisms' life cycles consist of hierarchical stages, from a single phenological stage (for example, flowering within a season), to vegetative and reproductive phases, to the total lifespan of the individual. Yet phenological events are typically studied in isolation, limiting our understanding of life history responses to climate change. Here, we reciprocally transfer plant communities along ...

Journal: :Remote Sensing 2010
Yingxin Gu Jesslyn F. Brown Tomoaki Miura Willem J. D. van Leeuwen Bradley C. Reed

This study introduces a new geographic framework, phenological classification, for the conterminous United States based on Moderate Resolution Imaging Spectroradiometer (MODIS) Normalized Difference Vegetation Index (NDVI) time-series data and a digital elevation model. The resulting pheno-class map is comprised of 40 phenoclasses, each having unique phenological and topographic characteristics...

2009
C. Jeganathan J. Dash

Time series (2003 to 2007) MERIS Terrestrial Chlorophyll Index (MTCI) products were used to predict the phenology of different forest types in India. The MTCI data were corrected for noise using a temporal moving window filter and then a Fourierbased smoothing was applied without compromising annual phenological cycle. Finally, the phenological variables i.e. onset of greenness and end of senes...

Journal: :Ecology letters 2010
Louie H Yang V H W Rudolf

Climate change is altering the phenology of many species and the timing of their interactions with other species, but the impacts of these phenological shifts on species interactions remain unclear. Classical approaches to the study of phenology have typically documented changes in the timing of single life-history events, while phenological shifts affect many interactions over entire life hist...

2011
Juan M. Lopez-Sanchez Shane R. Cloude J. David Ballester-Berman

The polarimetric behaviour of rice fields at different phenological stages has been analysed by using time series of TerraSAR-X images. These are X-band copolar dual-pol images available for the whole growth cycle. As plants grow, changes in their morphology produce clear signatures in various polarimetric observables. Based on this sensitivity to phenology, a physically based retrieval approac...

2015
Carmen Prieto Georgia Destouni Nikos T Papadopoulos

Our possibility to appropriately detect, interpret and respond to climate-driven phenological changes depends on our ability to model and predict the changes. This ability may be hampered by non-linearity in climate-phenological relations, and by spatiotemporal variability and scale mismatches of climate and phenological data. A modeling methodology capable of handling such complexities can be ...

2017
Lucie Kuczynski Mathieu Chevalier Pascal Laffaille Marion Legrand Gaël Grenouillet

In response to climate change, earlier phenological events have been reported for a large range of taxa such that phenological shifts are considered as one of the fingerprints of the effect of climate change on organisms. Evidence further suggests that changes in the timing of phenological events might decouple biotic interactions due to differential phenological adjustment among interacting sp...

2012
Jacob Johansson Isabel M. Smallegange Niclas Jonzén

Many migratory birds have changed their timing of arrival at breeding grounds in response to recent climate change. Understanding the adaptive value and the demographic consequences of these shifts are key challenges. To address these questions we extend previous models of phenological adaptation to climate change under territory competition to include feedback from population dynamics, winter ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1999
N L Bradley A C Leopold J Ross W Huffaker

A phenological study of springtime events was made over a 61-year period at one site in southern Wisconsin. The records over this long period show that several phenological events have been increasing in earliness; we discuss evidence indicating that these changes reflect climate change. The mean of regressions for the 55 phenophases studied was -0.12 day per year, an overall increase in phenol...

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