Search results for "DISTANCE"
showing 10 items of 1009 documents
Genetic population structure of two cryptic Gammarus fossarum types across a contact zone
1998
Previous studies have revealed inconsistent results about the taxonomic status of European Gammarus fossarum forms. The variability in morphology and hybridization ability has not shown clear geographic patterns, whereas on a genetical basis two Central European G. fossarum forms have been proposed. In the present study the genetic structure of G. fossarum populations was investigated across a natural contact zone. For the first time direct comparisons of allotopic versus syntopic populations were feasible. 24 Populations of G. fossarum plus 4 populations of G. pulex (as outgroup) were sampled along 2 transects across the contact zone. The genotypes of about 60 individuals per population we…
Population genetic structure of the butterflyMelitaea didyma(Nymphalidae) along a northern distribution range border
1996
The population genetic structure of the butterfly Melitaea didyma was studied along the northern distribution range border in Central Germany by means of allozyme electrophoresis. Individuals were sampled from a total of 21 habitat patches from four regions, and two provinces. Sampling was designed to estimate local vs. regional differentiation. High levels of variability were found, He= 0.14-0.21. The mean expected sample heterozygosity from one region, Mosel, was significantly lower than from the Hammelburg region, He= 0.17 and 0.19, respectively. Two hierarchical levels of genetic differentiation were found. Within regions individuals sampled from different patches behaved as belonging t…
Comparative population genetic structures of the fruit flyUrophora carduiand its primary parasitoidEurytoma robusta
2003
The interaction between two species may depend on geographic scale and this in turn can affect co-evolution among them. The present study comparatively examines population genetic structures of the tephritid gall fly Urophora cardui and its primary ectoparasitoid Eurytoma robusta for inference of relative dispersal patterns and host parasitoid specificity. Genetic differentiation patterns indicated two levels of hierarchical structure in both species: locally similar distance-dependencies but globally differences. Locally, both species showed isolation by distance and a high correlation between host anti parasitoid F ST for the same population-pairs was found. At the local level, E. robusta…
Can cycling with an E-bike improve fitness? : effect of access to an Electric Assisted Bicycle on cycling distance and cardiopulmonary fitness in ina…
2016
Masteroppgave folkehelsevitenskap - Universitetet i Agder 2016 Background: The aims of the present study were to assess the effect of an eight-month intervention with access to an Electric assisted bicycle (E-bike) on (1) the amount of E-biking, (2) changes in cardiopulmonary fitness and (3) to assess whether cycled distance was associated with changes in cardiopulmonary fitness, among inactive adults. Methods: Twenty-five inactive Norwegian adults (33 – 57 years of age, 72 % women), were recruited through convenience sampling. Participants were given an E-bike for eight (N = 23) or three (N = 2) months. Socio-demographic characteristics were reported with a questionnaire. Bicycle use was m…
Hipotēžu pārbaude divu izlašu lokācijas-mēroga modelim
2020
Darbā aplūkots lokācijas-mēroga modelis un metodes tā noteikšanai. Galvenokārt tika aplūkoti lokācijas-mēroga testi, kā arī Kolmogorova-Smirnova tests, un to robežsadalījumu uzvedība situācijās, kad dati tika transformēti, zinot parametru nobīdi, kā arī izmantojot Mallova distances metodi. Lokācijas-mēroga modeļa apskatei tika pielietoti arī PP, QQ gafiki, un empīriskās ticamības funkcijas metode. Darba gaitā tika pētīta testu uzvedība, testējot gan simulētu, gan reālu datu piemērus.
Age and gender differences in half-Ironman triathlon performances - the Ironman 70.3 Switzerland from 2007 to 2010
2012
Beat Knechtle,1,2 Christoph Alexander Rüst,2 Thomas Rosemann,2 Romuald Lepers31Gesundheitszentrum St Gallen, St Gallen, Switzerland; 2Institute of General Practice and Health Services Research, University of Zurich, Zurich, Switzerland; 3INSERM U1093, Faculty of Sport Sciences, University of Burgundy, Dijon, FranceBackground: To date, the age-related decline and gender differences in performance have been investigated for both Olympic and Ironman distance triathlons, but not for the intermediate distance (ie, the half-Ironman distance triathlon covering 1.9 km swimming, 90 km cycling and 21.1 km running, Ironman 70.3®). We determined the age-related differences in performan…
Distance decay 2.0. A global synthesis of taxonomic and functional turnover in ecological communities
2022
Caio Graco-Roza was funded by the Coordination for the Improvement of Higher Education Personnel (CAPES), the Carlos Chagas Filho Research Support Foundation (FAPERJ) and the Ella and Georg Erhnrooth Foundation; Jan Altman by research grants INTER-EXCELLENCE LTAUSA19137 provided by Czech Ministry of Education, Youth and Sports, 20-05840Y of the Czech Science Foundation, and long-term research development project no. RVO 67985939 of the Czech Academy of Sciences; Otso Ovaskainen was funded by Academy of Finland (grant no. 309581), Jane and Aatos Erkko Foundation, Research Council of Norway through its Centres of Excellence Funding Scheme (223257), and the European Research Council (ERC) unde…
The Born–Oppenheimer equilibrium bond distance of GeO from millimetre- and submillimetre-wave spectra and quantum-chemical calculations
2014
The millimetre- and submillimetre-wave spectra of the five common isotopologues of (GeO)-O-16 in their electronic and vibrational ground state have been recorded in the spectral region 115-732GHz; for (GeO)-Ge-74-O-16, the rotational spectrum in the v = 1 state has been detected as well. Exploiting the high precision of the measurements, the Born-Oppenheimer breakdown parameter Delta(Ge)(01) could be determined from a Dunham analysis of the spectral data, whereas Delta(O)(01) was obtained from quantum-chemical calculations, because of the lack of high-precision measurements for the (GeO)-O-18 isotopologues. From the rotational equilibrium constant, the Born-Oppenheimer equilibrium distance …
E-tutoring nella didattica telematica. Pratiche di modellamento.
2021
Il lavoro si propone di delineare quali evoluzioni la figura dell'e-tutor stia attraversando nel contesto della didattica telematica alla luce dei cambiamenti che i media digitali e sociali introducono (Rivoltella, 2017; Ferrari, 2019). Resta fondamentale la dimensione comunicativa su cui tale ruolo si basa (Rivoltella, 2006), che evidenzia la necessità di competenze di moderazione online, allestimento di gestione dei gruppi e animazione di online communities.All'e-tutor, in particolare, è richiesta consapevolezza sull'attività di modellamento che svolge nei confronti dei corsisti attraverso le sue attività comunicative e didattiche (interattive e…