ORCID Profile
0000-0002-8630-8983
Current Organisations
Norges Teknisk Naturvitenskapelige Universitet Fakultet for naturvitenskap og teknologi
,
Tec3 - Engenharia e Geotecnia
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Publications
Evolvability and trait function predict phenotypic divergence of plant populations
Publisher: Proceedings of the National Academy of Sciences
Date: 29-12-2022
Abstract: Understanding the causes and limits of population ergence in phenotypic traits is a fundamental aim of evolutionary biology, with the potential to yield predictions of adaptation to environmental change. Reciprocal transplant experiments and the evaluation of optimality models suggest that local adaptation is common but not universal, and some studies suggest that trait ergence is highly constrained by genetic variances and covariances of complex phenotypes. We analyze a large database of population ergence in plants and evaluate whether evolutionary ergence scales positively with standing genetic variation within populations (evolvability), as expected if genetic constraints are evolutionarily important. We further evaluate differences in ergence and evolvability– ergence relationships between reproductive and vegetative traits and between selfing, mixed-mating, and outcrossing species, as these factors are expected to influence both patterns of selection and evolutionary potentials. Evolutionary ergence scaled positively with evolvability. Furthermore, trait ergence was greater for vegetative traits than for floral (reproductive) traits, but largely independent of the mating system. Jointly, these factors explained ~40% of the variance in evolutionary ergence. The consistency of the evolvability– ergence relationships across erse species suggests substantial predictability of trait ergence. The results are also consistent with genetic constraints playing a role in evolutionary ergence.
The effect of land cover type on radar altimeter response and its influence on retracker algorithms
Publisher: SPIE
Date: 21-10-2014
DOI: 10.1117/12.2066889
AN ORIGINAL PROCESSING METHOD OF SATELLITE ALTIMETRY FOR ESTIMATING WATER LEVELS AND VOLUME FLUCTUATIONS IN A SERIES OF SMALL LAKES OF THE PANTANAL WETLAND COMPLEX IN BRAZIL
Publisher: Copernicus GmbH
Date: 23-06-2016
DOI: 10.5194/ISPRSARCHIVES-XLI-B8-327-2016
Abstract: Satellite altimetry is becoming a major tool for measuring water levels in rivers and lakes offering accuracies compatible with many hydrological applications, especially in uninhabited regions of difficult access. The Pantanal is considered the largest tropical wetland in the world and the sparsity of & i& in situ& /i& gauging station make remote methods of water level measurements an attractive alternative. This article describes how satellites altimetry data from Envisat and Saral was used to determine water level in two small lakes in the Pantanal. By combining the water level with the water surface area extracted from satellite imagery, water volume fluctuations were also estimated for a few periods. The available algorithms (retrackers) that compute a range solution from the raw waveforms do not always produce reliable measurements in small lakes. This is because the return signal gets often “contaminated” by the surrounding land. To try to solve this, we created a “lake” retracker that rejects waveforms that cannot be attributed to “calm water” and convert them to altitude. Elevation data are stored in a database along with the water surface area to compute the volume fluctuations. Satellite water level time series were also produced and compared with the only nearby & i& in situ& /i& gauging station. Although the “lake” retracker worked well with calm water, the presence of waves and other factors was such that the standard “ice1” retracker performed better on the overall. We estimate our water level accuracy to be around 75 cm. Although the return time of both satellites is only 35 days, the next few years promise to bring new altimetry satellite missions that will significantly increase this frequency.
How to quantify thermal acclimation capacity?
Publisher: Wiley
Date: 24-03-2019
DOI: 10.1111/GCB.14598
Abstract: The capacity of organisms to acclimate will influence their ability to cope with ongoing global changes in thermal regimes. Here we highlight methodological issues associated with recent attempts to quantify variation in acclimation capacity among taxa and environments, and describe how these may introduce bias to conclusions. We then propose a measure of thermal acclimation capacity that more directly quantifies the process of acclimation. Future studies of variation in acclimation capacity should critically evaluate whether their chosen empirical metric accurately reflects the theoretical concept of acclimation.
Related Organisations
Norges Teknisk Naturvitenskapelige Universitet Fakultet For Naturvitenskap Og Teknologi
Location: Norway
Related Funding Activities
No related grants have been discovered for christophe pelabon.