نتایج جستجو برای: phenology

تعداد نتایج: 6635  

Journal: :Biology letters 2014
H K Zhou B Q Yao W X Xu X Ye J J Fu Y X Jin X Q Zhao

Worldwide, many plant species are experiencing an earlier onset of spring phenophases due to climate warming. Rapid recent temperature increases on the Tibetan Plateau (TP) have triggered changes in the spring phenology of the local vegetation. However, remote sensing studies of the land surface phenology have reached conflicting interpretations about green-up patterns observed on the TP since ...

Journal: :The American naturalist 2015
Liana T Burghardt C Jessica E Metcalf Amity M Wilczek Johanna Schmitt Kathleen Donohue

Organisms develop through multiple life stages that differ in environmental tolerances. The seasonal timing, or phenology, of life-stage transitions determines the environmental conditions to which each life stage is exposed and the length of time required to complete a generation. Both environmental and genetic factors contribute to phenological variation, yet predicting their combined effect ...

2013
Kusum J. Naithani Doug C. Baldwin Katie P. Gaines Henry Lin David M. Eissenstat

Quantifying coupled spatio-temporal dynamics of phenology and hydrology and understanding underlying processes is a fundamental challenge in ecohydrology. While variation in phenology and factors influencing it have attracted the attention of ecologists for a long time, the influence of biodiversity on coupled dynamics of phenology and hydrology across a landscape is largely untested. We measur...

2014
Helena J. R. Einzmann Joachim Beyschlag Florian Hofhansl Wolfgang Wanek Gerhard Zotz

The processes that govern diverse tropical plant communities have rarely been studied in life forms other than trees. Structurally dependent vascular epiphytes, a major part of tropical biodiversity, grow in a three-dimensional matrix defined by their hosts, but trees differ in their architecture, bark structure/chemistry and leaf phenology. We hypothesized that the resulting seasonal differenc...

Journal: :Remote Sensing 2017
Kyle R. Springer Ran Wang John A. Gamon

Tree species in the boreal forest cycle between periods of active growth and dormancy alter their photosynthetic processes in response to changing environmental conditions. For deciduous species, these changes are readily visible, while evergreen species have subtler foliar changes during seasonal transitions. In this study, we used remotely sensed optical indices to observe seasonal changes in...

2017
Yun Wu Qing-Jun Li

Floral traits have largely been attributed to phenotypic selection in plant-pollinator interactions. However, the strength of this link has rarely been ascertained with real pollinators. We conducted pollinator observations and estimated selection through female fitness on flowering phenology and floral traits between two Primula secundiflora populations. We quantified pollinator-mediated selec...

2013
Claudia Burger Andreas Nord Jan-Åke Nilsson Emmanuelle Gilot-Fromont Christiaan Both

Climate change leads to rapid, differential changes in phenology across trophic levels, often resulting in temporal mismatches between predators and their prey. If a species cannot easily adjust its timing, it can adapt by choosing a new breeding location with a later phenology of its prey. In this study, we experimentally investigated whether long-distance dispersal to northern breeding ground...

2015
B. K. Kenduiywo D. Bargiel U. Soergel

The rapid increase in population in the world has propelled pressure on arable land. Consequently, the food basket has continuously declined while global demand for food has grown twofold. There is need to monitor and update agriculture land-cover to support food security measures. This study develops a spatial-temporal approach using conditional random fields (CRF) to classify co-registered im...

2015
Julie A. Heath Karen Steenhof Mark A. Foster

Global climate change has affected avian migration patterns and nesting phenology. Changes in one phase of a bird’s cycle will most likely affect other stages, but few studies focus simultaneously on multiple life-history events. We used western North American ringing records and Christmas Bird Counts to examine whether changes in migration patterns were concordant with advancing American kestr...

2009
Louie H. Yang V. H. W. Rudolf

Louie H. Yang and V. H. W. Rudolf* Department of Entomology, UC Davis, CA 95616, USA Department of Ecology & Evolutionary Biology, Rice University, Houston, TX 77098, USA *Correspondence: E-mail: [email protected] These authors contributed equally to this work. Abstract Climate change is altering the phenology of many species and the timing of their interactions with other species, but the...

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