نتایج جستجو برای: phenology

تعداد نتایج: 6635  

Journal: :Blue Jay 1948

Journal: :Proceedings. Biological sciences 2008
Eric Post Christian Pedersen Christopher C Wilmers Mads C Forchhammer

Temporal advancement of resource availability by warming in seasonal environments can reduce reproductive success of vertebrates if their own reproductive phenology does not also advance with warming. Indirect evidence from large-scale analyses suggests, however, that migratory vertebrates might compensate for this by tracking phenological variation across landscapes. Results from our two-year ...

2015
Cecilia Kullberg Thord Fransson Johanna Hedlund Niclas Jonzén Ola Langvall Johan Nilsson Kjell Bolmgren

Many migratory bird species have advanced their spring arrival during the latest decades, most probably due to climate change. However, studies on migratory phenology in the period before recent global warming are scarce. We have analyzed a historical dataset (1873-1917) of spring arrival to southern and central Sweden of 14 migratory bird species. In addition, we have used relative differences...

2007
Jeremy I. Fisher John F. Mustard

Phenological records constructed from global mapping satellite platforms (e.g. AVHRR and MODIS) hold the potential to be valuable tools for monitoring vegetation response to global climate change. However, most satellite phenology products are not validated, and field checking coarse scale (≥500 m) data with confidence is a difficult endeavor. In this research, we compare phenology from Landsat...

Journal: :International journal of biometeorology 2005
Rolf Borchert Kevin Robertson Mark D Schwartz Guadalupe Williams-Linera

Several North American broad-leaved tree species range from the northern United States at approximately 47 degrees N to moist tropical montane forests in Mexico and Central America at 15-20 degrees N. Along this gradient the average minimum temperatures of the coldest month (T (Jan)), which characterize annual variation in temperature, increase from -10 to 12 degrees C and tree phenology change...

Journal: :Global change biology 2014
Eugénie S Euskirchen Tobey B Carman A David McGuire

The phenology of arctic ecosystems is driven primarily by abiotic forces, with temperature acting as the main determinant of growing season onset and leaf budburst in the spring. However, while the plant species in arctic ecosystems require differing amounts of accumulated heat for leaf-out, dynamic vegetation models simulated over regional to global scales typically assume some average leaf-ou...

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...

Journal: :Global change biology 2013
Tsechoe Dorji Orjan Totland Stein R Moe Kelly A Hopping Jianbin Pan Julia A Klein

Global climate change is predicted to have large impacts on the phenology and reproduction of alpine plants, which will have important implications for plant demography and community interactions, trophic dynamics, ecosystem energy balance, and human livelihoods. In this article we report results of a 3-year, fully factorial experimental study exploring how warming, snow addition, and their com...

Journal: :The New phytologist 2014
Elizabeth M Wolkovich Benjamin I Cook T Jonathan Davies

Climate change has brought renewed interest in the study of plant phenology - the timing of life history events. Data on shifting phenologies with warming have accumulated rapidly, yet research has been comparatively slow to explain the diversity of phenological responses observed across latitudes, growing seasons and species. Here, we outline recent efforts to synthesize perspectives on plant ...

2005
Yeonjoo Kim Guiling Wang

[1] Seasonal variability of vegetation, determined by plant phenology, impacts the seasonality of surface and atmospheric water cycles as well as the seasonality of surface energy budget. At the same time, leaf seasonal variations respond to both cumulative and concurrent hydrometeorological conditions. In order to account for this vegetation feedback at the seasonal timescale, a predictive phe...

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