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Sökning: WFRF:(Wirth Michelle M)

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1.
  • 2019
  • Tidskriftsartikel (refereegranskat)
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2.
  • Kattge, Jens, et al. (författare)
  • TRY plant trait database - enhanced coverage and open access
  • 2020
  • Ingår i: Global Change Biology. - : Wiley-Blackwell. - 1354-1013 .- 1365-2486. ; 26:1, s. 119-188
  • Tidskriftsartikel (refereegranskat)abstract
    • Plant traits-the morphological, anatomical, physiological, biochemical and phenological characteristics of plants-determine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem properties and their benefits and detriments to people. Plant trait data thus represent the basis for a vast area of research spanning from evolutionary biology, community and functional ecology, to biodiversity conservation, ecosystem and landscape management, restoration, biogeography and earth system modelling. Since its foundation in 2007, the TRY database of plant traits has grown continuously. It now provides unprecedented data coverage under an open access data policy and is the main plant trait database used by the research community worldwide. Increasingly, the TRY database also supports new frontiers of trait-based plant research, including the identification of data gaps and the subsequent mobilization or measurement of new data. To support this development, in this article we evaluate the extent of the trait data compiled in TRY and analyse emerging patterns of data coverage and representativeness. Best species coverage is achieved for categorical traits-almost complete coverage for 'plant growth form'. However, most traits relevant for ecology and vegetation modelling are characterized by continuous intraspecific variation and trait-environmental relationships. These traits have to be measured on individual plants in their respective environment. Despite unprecedented data coverage, we observe a humbling lack of completeness and representativeness of these continuous traits in many aspects. We, therefore, conclude that reducing data gaps and biases in the TRY database remains a key challenge and requires a coordinated approach to data mobilization and trait measurements. This can only be achieved in collaboration with other initiatives.
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3.
  • Bomberg, Eric M, et al. (författare)
  • Central ghrelin induces feeding driven by energy needs not by reward
  • 2007
  • Ingår i: NeuroReport. - 0959-4965 .- 1473-558X. ; 18:6, s. 591-595
  • Tidskriftsartikel (refereegranskat)abstract
    • Centrally administered ghrelin, the endogenous agonist of the growth hormone secretegogue receptor, powerfully stimulates food intake. Although the orexigenic action of this peptide has been well established, it remains unclear whether ghrelin-induced hyperphagia is driven by energy needs or by reward. In our study ghrelin was injected into the lateral cerebral ventricle or the hypothalamic paraventricular nucleus of rats given a choice between a palatable yet calorie-dilute sucrose solution and a calorically dense chow. As a result of intraventricular and hypothalamic paraventricular ghrelin injections, animals increased intake of chow but not sucrose. When the sucrose solution was offered as the only source of calories, rats treated with ghrelin infused in the ventricle and site-specifically increased sucrose consumption. These results suggest that the primary effect of ghrelin is to stimulate food intake to satisfy energy needs.
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