449 research outputs found
Impact scores of invasive plants are biased by disregard of environmental co-variation and non-linearity
No full textPrioritisation of high-impact species is becoming increasingly important for management of introduced species (‘neobiota’) because of their growing number of which, however, only a small fraction has substantial impacts. Impact scores for prioritising species may be affected by the type of effect model used. Recent studies have shown that environmental co-variation and non-linearity may be significant for effect models of biological invasions. Here, we test for differences in impact scores between simple and complex effect models of three invasive plant species (Heracleum mantegazzianum, Lupinus polyphyllus, Rosa rugosa). We investigated the effects of cover percentages of the invasive plants on species richness of invaded communities using both simple linear effect models (‘basic models’) and more complex linear or nonlinear models including environmental co-factors (‘full models’). Then, we calculated impact scores for each invasive species as the average reduction of species richness predicted by basic and full effect models. All three non-native species had negative effects on species richness, but the full effect models also indicated significant influence of habitat types. Heracleum mantegazzianum had uniform linear effects in all habitats, while effects of L. polyphyllus interacted strongly with habitat type, and R. rugosa showed a marked non-linear relationship. Impact scores were overestimated by basic effect models for H. mantegazzianum and R. rugosa due to disregard of habitat effects and non-linearity, respectively. In contrast, impact of L. polyphyllus was underestimated by the basic model that did not account for the strong interaction of invader cover and habitat type. We conclude that simple linear models will often yield inaccurate impact scores of non-native species. Hence, effect models should consider environmental co-variation and, if necessary, non-linearity of the effects of biological invasions on native ecosystems
Vor, während und nach dem Besuch. Visitor Journeys in den Staatlichen Museen zu Berlin. Eine sozialwissenschaftliche Untersuchung im Teilprojekt Visitor Journeys neu gedacht im Verbundprojekt museum4punkt0
No full textDas Teilprojekt Visitor Journeys neu gedacht der Staatlichen Museen zu Berlin im Verbundprojekt museum4punkt0 untersucht, wie die vielfältigen Kontaktpunkte zwischen BesucherInnen, NutzerInnen und Museen mithilfe digitaler Technologien gestaltet werden können. Um zu einem besseren Verständnis der BesucherInnen sowie ihrer Erwartungen und Bedürfnisse an den Museumsbesuch zu gelangen, wurde eine umfassende Grundlagenstudie durchgeführt. Die Grundthese der Studie lautet, dass sich die BesucherInnen der Staatlichen Museen zu Berlin entlang ihrer Motivationen für ihren Besuch unterscheiden lassen. In einem Methodenmix aus quantitativer und qualitativer Sozialforschung wurden die Wünsche, Bedürfnisse und Erwartungen von BesucherInnen an den Museumsbesuch und (digitale) Vermittlungsinstrumente umfassend untersucht. Grundlage der Untersuchung war das von John H. Falk erforschte Modell, das MuseumsbesucherInnen – je nach Motivation – in Explorers, Facilitators, Professionals / Hobbyists, Experience Seekers und Rechargers unterscheidet. Falks handlungsorientierter Ansatz erlaubt eine hochgradig individuelle Betrachtung der BesucherInnen und ihrer Erfahrungen. Aus den Ergebnissen wurden Persona und Visitor Journey Maps gebildet. Die Wünsche und Bedürfnisse der BesucherInnen und NutzerInnen lassen sich so nachvollziehen und können die Grundlage für die Entwicklung verschiedener zielgruppenspezifischer Angebote bilden.Diese Studie ist entstanden im Verbundprojekt museum4punkt0 – Digitale Strategien für das Museum der Zukunft. Weitere Informationen: www.museum4punkt0.de. Das Projekt museum4punkt0 wird gefördert durch die Beauftragte der Bundesregierung für Kultur und Medien aufgrund eines Beschlusses des Deutschen Bundestages. Weitere Informationen unter: www.museum4punkt0.de.
This study is part of the project museum4punkt0 - Digital Strategies for the Museum of the Future. Further information: www.museum4punkt0.de/en/
The project museum4punkt0 is funded by the Federal Government Commissioner for Culture and the Media in accordance with a resolution issued by the German Bundestag (Parliament of the Federal Republic of Germany). More information is available at: www.museum4punkt0.de.
Text und Bearbeitung: Katharina Fendius,Josefine Otte
Koordination der Studie: Nadja Bauer, Josefine Otte
Durchführung der Studie: Nadja Bauer, Josefine Otte, Dr. Vera Allmanritter, Dr. Annette Löseke
Wissenschaftliche Beratung und Datenauswertung: Dr. Vera Allmanritter, Katharina Fendius, Dr. Silke Hieke, Dr. Helge Kaul, Dr. Annette Lösek
Lifetime of Atomic Spin Chains: Enhancing spin lifetime, remote detection of magnons and implementation of ESR-STM
No full textThis thesis describes atomic spin chains subject to magnetic anisotropy. Such chains, assembled through means of scanning tunneling microscopy (STM), can be home to a plethora of magnetic states and spin physics. This includes quantum tunneling of magnetization, the injection and delocalization of magnons and, for single atoms, the application of electron spin resonance (ESR). Each phenomenon happens at their own timescale which is dependent on the isolation of the spin chain from the environment, ranging from seconds to picoseconds.QN/Otte La
Tergoceracris luquillensis Perez-Gelabert & Otte, 2003, n. sp.
No full textTergoceracris luquillensis n. sp. Figs. 2, 3, 5 F, 6 C, 7, 9, 20, 21 Diagnosis.— Differentiated from the other species as follows: furculae relatively short, not much flared at apex (Fig. 5 F); epiproct lateral ridges unilobed; off center mounds low, poorly developed (Fig. 6 C); tegmina green; lophi of epiphallus very elongate (Fig. 20 D). Description.— Male. Body completely green except for abdominal segments which are greenish brown. Head: Antennae with first 5 segments reddish, the rest brown. Pronotum: dorsally marked by dark annular area surrounded by concentric cream yellow bands. Pronotal side mostly green but with darker black band that does not reach either pronotal margin. Cream yellow band on pronotal side extending over to head. Wings: Tegmina slightly longer than pronotum length and completely green, with surface markedly reticular. Posterior area of wings more acute than in the other species. Abdomen: abdominal segments brown. Vertically elongated furculae smaller than in all other species, narrowing only slightly in the middle, flattening, separating but not widening on upper portion. Internal genitalia as in Figs. 20, 21. Etymology.—Name in aposition, in reference to its type locality. Type material.— Holotype: Male. PUERTO RICO, Luquillo Mts., 3,000 ft., Pico del Oeste, Harvard University Study Site, 26.vi. 1969, T. J. Cohn (ANSP). Allotype: Female. Same data as holotype (ANSP). Paratypes: One adult and four juvenile males, 2 adult females, same data as holotype (ANSP). Two males and 6 females, Sierra de Luquillo, Pico del Oeste, (in Luquillo Experimental Forest), 1150 m, 1718.vii. 1967, R. A. Howard, (UMMZ). One female, onlybearing El Yunque, Puerto Rico as collecting data (NMNH). One female, El Yunque, Caribbean National Forest, 1.4 km on trail to El Toro, on Ocotea leucoxylon (Lauraceae), 26.x. 2001, D. E.PerezGelabert and M. A. García, (DEPG). Habitat.— Wet forest in Sierra de Luquillo, eastern Puerto Rico. Some of the specimens collected by R. A. Howard have notes indicating they were taken on Tabebuia radiata (Bignoniaceae), and were observed tofeed on this plant. The female collected by the senior author in 2001 was found at the edge of the trail at an altitude of 700 800 m on Ocotea leucoxylon (Lauraceae).Published as part of Perez-Gelabert, Daniel E. & Otte, Daniel, 2003, Tergoceracris, a new genus and six new species of montane grasshoppers (Orthoptera: Acrididae: Ommatolampinae) from Dominican Republic and Puerto Rico, pp. 1-31 in Zootaxa 155 on pages 8-9, DOI: 10.5281/zenodo.15697
Tergoceracris guajataca Perez-Gelabert & Otte, 2003, n. sp.
No full textTergoceracris guajataca n. sp. Figs. 3, 5 C, 6 A, 7, 8, 9, 14, 15 Diagnosis.— Similar in coloration and morphology to T. cerropunta and T. cayey while differentiated by the wing color from T. luquillensis. Differs from T. cerropunta and T. cayey as follows: Endophallic plate relatively shorter (about 1.3X as long as ventral valve of aedeagus) (Fig. 15 D); epiproct lateral ridges unilobed and offcenter mounds elongate (Fig. 6 A) (epiproct lateral ridges bilobed in T. cayey and offcenter mounds short in T. cerropunta); lophi of epiphallus more robust in dorsal view (Fig. 14 D). Description.— Male. Coloration very similar to that of T. cerropunta, both brightly adorned. Pronotum: annular area light greenish brown in center surrounded by black and cream yellow bands. Wide band at pronotal side green and light brown, followed below by arched cream yellow band that delimits smaller portion of green on lower margin. Wings: Tegmina short, pink reddish with some black on posterior edge, with surface markedly reticular. Abdomen: dorsal midline marked by interrupted black streak. Furculae vertically elevated, slightly longer and thinner than in the other Puerto Rican species, ascending jointly, narrowing, then separating and widening only slightly on upper portion. Internal genitalia: As illustrated in Figs. 14, 15. Etymology.— The name is derived from the type locality. Type material.— Holotype: Male. PUERTO RICO, Guajataca St. Forest, 7 miles SE Isabela, 600 ft. (200 m), 20.vi. 1969, T. J. Cohn (ANSP). Allotype: female. Same data as holotype (ANSP). Paratypes: One male, 2 females, same data as holotype (ANSP). Habitat.—Specimens were collected at about 600 ft.( 200 m) of elevation in the Guajataca State forest, near Isabela, Puerto Rico. This area is substantially lower than for the three other species. Vegetation there is mostly wet tropical forest. In a visit to this reserve and search around several trails by the senior author and Santo Navarro in October 2001, this forest was found to be rather dry and no specimens of these grasshoppers were encountered.Published as part of Perez-Gelabert, Daniel E. & Otte, Daniel, 2003, Tergoceracris, a new genus and six new species of montane grasshoppers (Orthoptera: Acrididae: Ommatolampinae) from Dominican Republic and Puerto Rico, pp. 1-31 in Zootaxa 155 on pages 6-7, DOI: 10.5281/zenodo.15697
sj-pdf-1-nnr-10.1177_15459683211041318 – Supplemental Material for Remote Corticospinal Tract Degeneration After Cortical Stroke in Rats May Not Preclude Spontaneous Sensorimotor Recovery
No full textSupplemental Material, sj-pdf-1-nnr-10.1177_15459683211041318 for Remote Corticospinal Tract Degeneration After Cortical Stroke in Rats May Not Preclude Spontaneous Sensorimotor Recovery by Michel R. T. Sinke, Geralda A. F. van Tilborg, Anu E. Meerwaldt, Caroline L. van Heijningen, Annette van der Toorn, Milou Straathof, Fazle Rakib, Mohamed H. M. Ali, Khalid Al-Saad, Willem M. Otte and Rick M. Dijkhuizen in Neurorehabilitation and Neural Repair</p
Building blocks for atomically assembled magnetic and electronic artificial lattices
No full textThis thesis focuses on possible platforms for a bottom-up approach towards realizing and characterizing atomically assembled magnetic and electronic artificial lattices. For this, we make use of the scanning tunneling microscope (STM), which provides a local probe of the magnetic and electronic properties of the sample and allows for the atom-by-atom construction of extended lattices. On the one hand, to address avenues for constructing extended spin lattices, we study single Fe atoms coordinated on the four-fold symmetric nitrogen binding site of the Cu2N/Cu3Au surface—a system which permits large-scale atomic assembly, and allows for independent access to both the orbital and spin degrees of freedom. On the other hand, we investigate the viability of laterally confined vacuum resonances on the chlorinated Cu(100) surface as a basis for constructing electronic lattices. We atomically assemble dimers and trimers of various geometries to determine the tight-binding parameters, and as a proof of concept, experimentally realize a looped Su-Schrieffer–Heeger chain using this platform. These studies are made possible by means of a low-temperature, ultra-high vacuum STM, which allows for atom manipulation and, via spectroscopic techniques, permits us to locally probe the sample density of states and detect inelastic excitations of the spin and orbital angular momentum.QN/Otte La
- …
