نتایج جستجو برای: phenology

تعداد نتایج: 6635  

2018
Víctor Flo Jordi Bosch Xavier Arnan Clara Primante Ana M Martín González Helena Barril-Graells Anselm Rodrigo

Species flower production and flowering phenology vary from year to year due to extrinsic factors. Inter-annual variability in flowering patterns may have important consequences for attractiveness to pollinators, and ultimately, plant reproductive output. To understand the consequences of flowering pattern variability, a community approach is necessary because pollinator flower choice is highly...

2015
Sandra Stålhandske Philipp Lehmann Peter Pruisscher Olof Leimar

The effect of spring temperature on spring phenology is well understood in a wide range of taxa. However, studies on how winter conditions may affect spring phenology are underrepresented. Previous work on Anthocharis cardamines (orange tip butterfly) has shown population-specific reaction norms of spring development in relation to spring temperature and a speeding up of post-winter development...

2011
Hu Zhao Zhengwei Yang Liping Di Zhiyuan Pei

Remote sensing based phenology detection method has been employed to study agriculture, forestry and other vegetations for its potential to reflect the variations in climate change. These studies usually utilized time series Normalized Difference Vegetation Index (NDVI) generated from various sensors through a Maximum Value Compositing (MVC) process, which minimized the contamination from cloud...

Journal: :The Journal of animal ecology 2012
Claudia Burger Eugen Belskii Tapio Eeva Toni Laaksonen Marko Mägi Raivo Mänd Anna Qvarnström Tore Slagsvold Thor Veen Marcel E Visser Karen L Wiebe Chris Wiley Jonathan Wright Christiaan Both

1. Climate warming has led to shifts in the seasonal timing of species. These shifts can differ across trophic levels, and as a result, predator phenology can get out of synchrony with prey phenology. This can have major consequences for predators such as population declines owing to low reproductive success. However, such trophic interactions are likely to differ between habitats, resulting in...

2008
Daniel P. Shustack

The tendency for birds to reproduce earlier in the season has been observed in urban compared to rural populations, but these observations are limited primarily to species that spend all or most of the year in North America (i.e., resident or short-distance migrants). However, the factors that influence the reproductive timing of resident and short-distance migrants are unlikely to have the sam...

2017
Jinyang Du John S. Kimball Claude Duguay Youngwook Kim Jennifer D. Watts

A new automated method enabling consistent satellite assessment of seasonal lake ice phenology at 5 km resolution was developed for all lake pixels (water coverage ≥ 90 %) in the Northern Hemisphere using 36.5 GHz H-polarized brightness temperature (Tb) observations from the Advanced Microwave Scanning Radiometer for EOS and Advanced Microwave Scanning Radiometer 2 (AMSR-E/2) sensors. The lake ...

2017
Ella F Cole Ben C Sheldon

Many organisms rely on synchronizing the timing of their life-history events with those of other trophic levels-known as phenological matching-for survival or successful reproduction. In temperate deciduous forests, the extent of matching with the budburst date of key tree species is of particular relevance for many herbivorous insects and, in turn, insectivorous birds. In order to understand t...

2015
John M. A. Duncan Jadunandan Dash Peter M. Atkinson

Many of the undernourished people on the planet obtain their entitlements to food via agricultural-based livelihood strategies, often on underperforming croplands and smallholdings. In this context, expanding cropland extent is not a viable strategy for smallholders to meet their food needs. Therefore, attention must shift to increasing productivity on existing plots and ensuring yield gaps do ...

2004
Phillip M. Dougherty David Whitehead James M. Vose

Phenology has been defined as the study of the timing of recurring biological events, the causes of their timing with regard to abiotic and biotic forces and the interrelation among phases of the same or different event (Reichle 1973, Leith 1974). The role of phenology in forest ecosystems has been discussed for several decades. Today, understanding how tree phenology is quantitatively related ...

Journal: :Proceedings. Biological sciences 2005
Marcel E Visser Christiaan Both

Climate change has led to shifts in phenology in many species distributed widely across taxonomic groups. It is, however, unclear how we should interpret these shifts without some sort of a yardstick: a measure that will reflect how much a species should be shifting to match the change in its environment caused by climate change. Here, we assume that the shift in the phenology of a species' foo...

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