830 research outputs found
Using the internet to aid in discovery of unrecognized type material
No full textSteudel, Bastian, Kessler, Michael, Nyffeler, Reto (2012): Using the internet to aid in discovery of unrecognized type material. Phytotaxa 62 (1): 13-24, DOI: 10.11646/phytotaxa.62.1.4, URL: http://biotaxa.org/Phytotaxa/article/view/phytotaxa.62.1.
Using the internet to aid in discovery of unrecognized type material
No full textHerbaria contain many specimens for which identification to species and family is not up-to-date with current classifications. However, updated species names are essential as key information for publishing digitized specimen data on internet-based online resources such as Global Biodiversity Information Facility (GBIF; www.gbif.org). Keeping herbarium collections current relative to classification of species and families poses a particular challenge to herbarium staff. Especially, families with a dynamic record of repeated changes in generic classification, such as Orchidaceae, require much curatorial attention. We used the World Checklist of Selected Plant Families (WCL; apps.kew.org/wcsp/home.do) for rapid validation of current species names of specimens of Orchidaceae housed at the combined herbaria of the University of Zurich (Z) and the Swiss Federal Institute of Technology Zurich (ZT). In order to evaluate the possible type status of specimens, we consulted the original species description when the reviewed specimens were collected prior to the date of the publication. Within 600 hours of labour, we reviewed and updated species names for about 10,000 orchid specimens and located 280 previously unrecognized type specimens. Almost half of the type specimens located in the general collections represent species described by Rudolf Schlechter, Fritz Kraenzlin, and Rudolf Mansfeld, whose original material was destroyed in 1943 in the Herbarium Berolinense (B) and for which discovery at Z+ZT is therefore particularly valuable
Using the internet to aid in discovery of unrecognized type material
No full textHerbaria contain many specimens for which identification to species and family is not up-to-date with current classifications. However, updated species names are essential as key information for publishing digitized specimen data on internet-based online resources such as Global Biodiversity Information Facility (GBIF; www.gbif.org). Keeping herbarium collections current relative to classification of species and families poses a particular challenge to herbarium staff. Especially, families with a dynamic record of repeated changes in generic classification, such as Orchidaceae, require much curatorial attention. We used the World Checklist of Selected Plant Families (WCL; apps.kew.org/wcsp/home.do) for rapid validation of current species names of specimens of Orchidaceae housed at the combined herbaria of the University of Zurich (Z) and the Swiss Federal Institute of Technology Zurich (ZT). In order to evaluate the possible type status of specimens, we consulted the original species description when the reviewed specimens were collected prior to the date of the publication. Within 600 hours of labour, we reviewed and updated species names for about 10,000 orchid specimens and located 280 previously unrecognized type specimens. Almost half of the type specimens located in the general collections represent species described by Rudolf Schlechter, Fritz Kraenzlin, and Rudolf Mansfeld, whose original material was destroyed in 1943 in the Herbarium Berolinense (B) and for which discovery at Z+ZT is therefore particularly valuable
August Wulfhorst (1861-1936) and his overlooked contributions on the flora of Angola
No full textFigueiredo, Estrela, Smith, Gideon F., Nyffeler, Reto (2013): August Wulfhorst (1861-1936) and his overlooked contributions on the flora of Angola. Candollea 68 (1): 123-131, DOI: 10.15553/c2013v681a1
Fig. 2 in August Wulfhorst (1861-1936) and his overlooked contributions on the flora of Angola
No full textFig. 2. – Holotype of Wulfhorstia spicata C. DC. (Z000015223), showing original and replacement labels.Published as part of Figueiredo, Estrela, Smith, Gideon F. & Nyffeler, Reto, 2013, August Wulfhorst (1861-1936) and his overlooked contributions on the flora of Angola, pp. 123-131 in Candollea 68 (1) on page 126, DOI: 10.15553/c2013v681a17, http://zenodo.org/record/603945
Different Modeling Strategies for Discrete Choice Models of Female Labour Supply: Estimates for Switzerland
Full text linkIn recent applications of discrete choice models of labour supply considerable attention has been devoted to strategies to increase the flexibility of models for a better fit to the data. These include the introduction of random parameters, fixed cost of work or flexible functional forms of preferences. Based on estimates of models of recent studies this paper compares these different modeling strategies. Results for Swiss data show that the traditional way to interpret fixed cost of work is ad hoc. Furthermore our results indicate that care should be taken when using very general function forms of preferences
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