نتایج جستجو برای: global variation

تعداد نتایج: 731710  

Journal: :The New phytologist 2015
Mark C Vanderwel Martijn Slot Jeremy W Lichstein Peter B Reich Jens Kattge Owen K Atkin Keith J Bloomfield Mark G Tjoelker Kaoru Kitajima

Recent compilations of experimental and observational data have documented global temperature-dependent patterns of variation in leaf dark respiration (R), but it remains unclear whether local adjustments in respiration over time (through thermal acclimation) are consistent with the patterns in R found across geographical temperature gradients. We integrated results from two global empirical sy...

Journal: :African J. of Inf. & Commun. Technology 2008
Joseph D. Dodo Mohd Hafiz Yahya Nor bin Kamarudin

of the major problems currently facing satellite-based positioning is the atmospheric refraction of the GPS signal caused by the troposphere. The tropospheric effect is much more pronounced at the equatorial region due to its hot and wet conditions. This affects the GPS signal due to the variability of the refractive index, which in turn affects the positional accuracy, especially in the height...

Journal: :International journal for parasitology 2014
Boris W Berkhout Melanie M Lloyd Robert Poulin Anja Studer

Climates are changing worldwide, and populations are under selection to adapt to these changes. Changing temperature, in particular, can directly impact ectotherms and their parasites, with potential consequences for whole ecosystems. The potential of parasite populations to adapt to climate change largely depends on the amount of genetic variation they possess in their responses to environment...

Journal: :Science 1994
P Foukal

Recent studies indicate that variation in the sun's luminosity is less than that observed in many other stars of similar magnetic activity. Current findings also indicate that in more active stars, the attenuation by faculae of sunspot luminosity modulation is less effective than in the sun at present. The sun could thus become photometrically more variable (and dimmer) if its magnetic activity...

2014
Ettore Fornasini Sandro Zampieri

The dominant state plays an essential role in the asyntotic analysis of dynamical systems. The global state in a 2D system consists in a sequence, and the existence of a dominant global state means that the free evolution of the global states tends to approximate this sequence, up to the multiplication by a normalizing factor. In this contribution the existence of a global state is proved under...

2012
Wataru Ishizuka Susumu Goto

Intraspecific adaptation in Abies sachalinensis was examined using models based on long-term monitoring data gathered during a reciprocal transplant experiment with eight seed source populations and six transplantation sites along an altitudinal gradient. The consequence of local adaptation was evaluated by testing the home-site advantage for upslope and downslope transplants at five ages. The ...

2013
Martin de Luis Katarina Čufar Alfredo Di Filippo Klemen Novak Andreas Papadopoulos Gianluca Piovesan Cyrille B. K. Rathgeber José Raventós Miguel Angel Saz Kevin T. Smith

We investigated the variability of the climate-growth relationship of Aleppo pine across its distribution range in the Mediterranean Basin. We constructed a network of tree-ring index chronologies from 63 sites across the region. Correlation function analysis identified the relationships of tree-ring index to climate factors for each site. We also estimated the dominant climatic gradients of th...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2001
W E Bradshaw C M Holzapfel

To date, all altered patterns of seasonal interactions observed in insects, birds, amphibians, and plants associated with global warming during the latter half of the 20th century are explicable as variable expressions of plastic phenotypes. Over the last 30 years, the genetically controlled photoperiodic response of the pitcher-plant mosquito, Wyeomyia smithii, has shifted toward shorter, more...

2012
Sylvain Dubey David A. Pike Richard Shine

Many endangered species persist as a series of isolated populations, with some populations more genetically diverse than others. If climate change disproportionately threatens the most diverse populations, the species’ ability to adapt (and hence its longterm viability) may be affected more severely than would be apparent by its numerical reduction. In the present study, we combine genetic data...

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