M. Ammann results 29
· Newest (Page 1/2, per page 25)
Author: M. Ammann ×Clear All Filters
Search Results
Global maps of soil temperatureNARA Subscribed
Research in global change ecology relies heavily on global climatic grids derived from estimates of air temperature in open areas at around 2 m above the ground. These climatic grids do not reflect conditions below vegetation canopies and near the ground surface, where critical ecosystem functions occur and most terrestrial species reside. Here, we provide global maps of soil temperature and bioclimatic variables at a 1‐km 2 r...
Statistics of multi‐year droughts from the method for object‐based diagnostic evaluationNARA Subscribed
This study uses the method for object‐based diagnostic evaluation (MODE) technique to examine and compare the statistics of drought attributes over the upper Colorado River basin (UCRB). The drought objects are based on the standardized precipitation index (SPI) and the standardized precipitation evapotranspiration index (SPEI) on a 36‐month timescale (SPI36 and SPEI36, respectively). The drought indicators are calculated usin...
Aim This paper aims to project areas of olive cultivation into future scenarios. Accordingly, we first asked the question whether global circulation models ( GCMs ) are able to reproduce past climatic conditions and we used historical ranges of olive cultivation as a palaeoclimate proxy. Location The M editerranean basin. Methods We used an ecological model, calibrated and validated for modern times, to test the reliability of...
Global patterns of connectivity and isolation of populations of forest bird species in the late P leistoceneNARA Subscribed
Aim Species’ distributional responses to cool periods in the P leistocene appear to have been diverse, but patterns of response are poorly known globally, and the nature of distributional responses to interglacial conditions remains largely unknown. The aim of this contribution is to assess distributional responses of forest bird species to L ast I nterglacial ( LIG ) and L ast G lacial M aximum ( LGM ) conditions within nine...
The ecological impact of oceanic island colonization – a palaeoecological perspective from the AzoresNARA Subscribed
Aim In many cases, human colonization drastically modified the ecosystems of remote oceanic islands before scientists arrived to document the changes. Palaeoecological records before and after human colonization provide insights into the original ecosystems and an assessment of subsequent human impact. We used pollen analysis to compare the impact of 15th century colonization of the Azores with that of natural disturbances suc...
Mycotoxins in indoor environmentsNARA Subscribed