748 research outputs found

    Genetic Conservation in a Climate of Loss: Thinking with Val Plumwood

    Full text link
    In February 2008 the Svalbard Global Seed Vault had its official opening. The vault is a co-operative project: while its construction was largely funded by the Norwegian Government, its management also involves the Global Crop Diversity Trust and others, and its seed samples are being provided by governments and organisations all over the world. The vault is located in the Svalbard Archipelago, and has been dug into a mountainside. The project's architects hope that the location's remotenessalongside a thick layer of rock and permafrostwill ensure the survival of the seed samples in the face of any political conflict or environmental catastrophes that may occur elsewhere in the world. In short, the facility aims to provide seed insurance in a time of uncertainty, instability and change. According to accounts in the press, this bank is a `doomsday vault carved into a frozen mountainside on a secluded Arctic island ready to serve as a Noah's Ark for seeds in case of a global catastrophe' (Mellgren)

    Loudly sing cuckoo : More-than-human seasonalities in Britain

    Get PDF
    This research was funded by a grant from the Arts and Humanities Research Council, grant number AH/E009573/1.Peer reviewedPostprin

    Oriënterende meting van ammoniakemissie Holcim Sleufvloer type B = Explorative ammonia emission measurements on the Holcim grooved floor type B

    Get PDF
    This report describes open flux chamber measurements on the Holcim grooved floor type B for dairy cattle compared to a slatted concrete floor as references. Results show that ammonia emission was 39% compared to the slatted floor. However it should be noticed that this are only explorative measurements that need validation at full scale

    Trait evolution and historical biogeography shape assemblages of annual killifish

    Get PDF
    International audienceAim: Different species assemblages of annual killifish possess replicated body size distributions yet have unique sets of species in each area of endemism. Here, we use models of trait evolution and historical biogeography to discover how size variation originated and has been restructured.Location: South America.Taxon: Austrolebias (Cyprinodontiformes).Methods: We sampled 63 individuals from 26 Austrolebias species. Using phylogenetic trees (BEAST2), data on environmental variables at sampling locations and size data, we compare different models for trait evolution (SURFACE, l1OU) of body size and niche traits. We model the historical biogeography of the areas of endemism (BioGeoBEARS) and use both analyses in combination to reconstruct the history of four species assemblages.Results: We present new phylogenetic trees for Austrolebias and use them to show that large size principally arose within a single area driven by a shifted selection optimum for a subset of the species in that area. We suggest that ecological interactions triggered size divergence and that this large‐bodied lineage subsequently spread to two other areas. A second assemblage may have been shaped by adaptation to a new environment without an associated increase in size divergence. A third assemblage, which has the smallest size range and the most recent origin, is phylogenetically clustered, and we found no evidence of environmental filtering.Main conclusions: Assemblage similarity in Austrolebias is the result of contrasting ecological, evolutionary and historical processes. Modelling trait evolution together with historical biogeography can help to disentangle the complex histories of multispecies assemblages. This approach provides context to commonly used tests investigating the role of ecological processes from phylogenetic data and generates new testable hypotheses on the processes that generated trait diversity and assemblage similarit

    Demonstration of synchronised scanning Lidar measurements of 2D velocity fields in a boundary-layer wind tunnel

    Get PDF
    This paper combines the currently relevant research methodologies of scaled wind turbine model experiments in wind tunnels with remote-sensing short-range WindScanner Lidar measurement technology. The wind tunnel of the Politecnico di Milano was equipped with three wind turbine models and two short-range WindScanner Lidars to demonstrate the benefits of synchronised scanning Lidars in such experimental surroundings for the first time. The dual- Lidar system can provide fully synchronised trajectory scans with sampling time scales ranging from seconds to minutes. First, staring mode measurements were compared to hot wire probe measurements commonly used in wind tunnels. This yielded goodness of fit coefficients of 0.969 and 0.902 for the 1 Hz averaged u- and v-components of the wind speed, respectively, validating the 2D measurement capability of the Lidar scanners. Subsequently, the measurement of wake profiles on a line as well as wake area scans were executed to illustrate the applicability of Lidar scanning to measuring small scale wind flow effects. The downsides of Lidar with respect to the hot wire probes are the larger measurement probe volume and the loss of some measurements due to moving blades. In contrast, the benefits are the high flexibility in conducting both point measurements and area scanning, and the fact that remote sensing techniques do not disturb the flow while measuring. The research campaign revealed a high potential for using short-range WindScanner Lidar for accurately measuring small scale flow structures in a wind tunnel
    corecore