Morten Larsen

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Positions of individual trees in high-resolution aerial photographs are estimated by use of templates derived from an optical tree crown model and the geometry at image acquisition. The template is bounded by an ellipse, for which we ®nd the optimal size, eccentricity and translation along one axis. Tree top positions are estimated as local maxima of the(More)
The genetic composition of marine microbial communities varies at the microscale between particle-associated (PA; >1.6 μm) and free-living (FL; 0.2–1.6 μm) niches. It remains unclear, however, how metabolic activities differ between PA and FL fractions. We combined rate measurements with metatranscriptomics to quantify PA and FL microbial activity in the(More)
To estimate positions of individual trees in high–resolution aerial photographs we use circular templates derived from an optical tree crown model and the geometry at image acquisition. A straight–forward analysis method consists of finding local maxima of the correlation function for the successively transposed templates over the whole image. Three ways of(More)
Growth performance and heavy metal uptake by willow (Salix viminalis) from strongly and moderately polluted calcareous soils were investigated in field and growth chamber trials to assess the suitability of willow for phytoremediation. Field uptakes were 2-10 times higher than growth chamber uptakes. Despite high concentrations of cadmium (>/=80 mg/kg) and(More)
Templates derived from an optical tree crown model have been used with good results in the estimation of individual spruce tree top positions in aerial photographs. The method can nd tree tops from a wide range of viewing angles including extreme oo-nadir views, but a requirement has been that the number of trees was estimated in advance and that various(More)
Bacteria of the SAR11 clade constitute up to one half of all microbial cells in the oxygen-rich surface ocean. SAR11 bacteria are also abundant in oxygen minimum zones (OMZs), where oxygen falls below detection and anaerobic microbes have vital roles in converting bioavailable nitrogen to N2 gas. Anaerobic metabolism has not yet been observed in SAR11, and(More)
Copepods are exposed to a high non-predatory mortality and their decomposing carcasses act as microniches with intensified microbial activity. Sinking carcasses could thereby represent anoxic microenvironment sustaining anaerobic microbial pathways in otherwise oxic water columns. Using non-invasive O2 imaging, we document that carcasses of Calanus(More)