Search results for "luu"
showing 10 items of 614 documents
Vertaissuhteet, hyvinvointi ja kouluviihtyvyys peruskoulun alakoulusta yläkouluun siirryttäessä
2009
Tutkimuksen tarkoituksena oli tarkastella oppilaiden vertaissuhteita, hyvinvointia ja kouluviihtyvyyttä, niissä tapahtuvia muutoksia oppilaiden siirtyessä alakoulusta yläkouluun sekä vertaissuhteiden yhteyttä hyvinvointiin ja kouluviihtyvyyteen. Tutkimukseen osallistuneet oppilaat (N=142, 88 tyttöä, 54 poikaa) täyttivät kyselylomakkeen kaksi kertaa: 6. luokalla (kevät 2008) ja siirryttyään 7. luokalle (syksy 2008). Oppilaiden vertaissuhteet kaverisuhteiden laadun osalta, itsetunto ja kouluviihtyvyys olivat hyviä niin ala- kuin yläkoulussa, minkä lisäksi yksinäisyyttä ja masennusoireita ei juuri havaittu. Kiusaamista kuitenkin havaittiin sekä ala- että yläkoulussa, niin että alakoulussa kius…
The Effect of Predator Population Dynamics on Batesian Mimicry Complexes.
2022
Understanding Batesian mimicry is a classic problem in evolutionary biology. In Batesian mimicry, a defended species (the model) is mimicked by an undefended species (the mimic). Prior theories have emphasized the role of predator behavior and learning as well as evolution in model-mimic complexes but have not examined the role of population dynamics in potentially governing the relative abundances and even persistence of model-mimic systems. Here, we examined the effect of the population dynamics of predators and alternative prey on the prevalence of warning-signaling prey composed of models and mimics. Using optimal foraging theory and signal detection theory, we found that the inclusion …
Evolution of signal diversity: predator-prey interactions and the maintenance of warning colour polymorphism in the wood tiger moth Arctia plantaginis
2017
Aposematic organisms avoid predation by advertising defences with warning signals. The theory of aposematism predicts warning signal uniformity, yet variation in warning coloration is widespread. The chemically defended wood tiger moth Arctia plantaginis shows both geographic variation and local polymorphism in warning coloration. In this thesis, I studied whether predation by local avian predators is driving the evolution of wood tiger moth warning colours. The close relatives of the wood tiger moth designated here to genus Arctia do not show similar colour polymorphism. The wood tiger moth is thus apparently under evolutionary radiation and provides a natural laboratory for observing curr…
The impact of life stage and pigment source on the evolution of novel warning signal traits
2021
Our understanding of how novel warning color traits evolve in natural populations is largely based on studies of reproductive stages and organisms with endogenously produced pigmentation. In these systems, genetic drift is often required for novel alleles to overcome strong purifying selection stemming from frequency-dependent predation and positive assortative mating. Here, we integrate data from field surveys, predation experiments, population genomics, and phenotypic correlations to explain the origin and maintenance of geographic variation in a diet-based larval pigmentation trait in the redheaded pine sawfly (Neodiprion lecontei), a pine-feeding hymenopteran. Although our experiments c…
The complete mitochondrial genome of the wood tiger moth (Arctia plantaginis) and phylogenetic analyses within Arctiinae
2021
We report the assembly and annotation of the complete mitochondrial genome of the warningly-coloured wood tiger moth (Arctia plantaginis) and investigate its phylogenetic position within Arctiinae. The A.plantaginis mitogenome is 15,479 bp long with 13 protein-coding genes, 22 transfer RNAs, 2 ribosomal RNA genes, and an A + T-rich region (D-loop). The phylogenetic analyses based on 13 protein-coding genes showed A.plantaginis clustering within a clade of species with white wings and yellow or red bodies. This result can be useful in understanding the evolution of coloration in Arctiid moths. Peer reviewed
Sprache und Integration russlanddeutscher Aussiedlerjugendlicher
2002
Improving Accessibility of eLearning in Higher Education from Universal Design for Learning Perspective
2019
School engagement in three Senegalese secondary schools
2014
The purpose of the research was to examine how is the construct and the prediction of school engagement and affective, cognitive and behavior engagement subdimensions in Senegalese secondary school. Another matter of interest was to find out what kind of the support experiences students get from teachers, family and peers. The cross-sectional data of research consisted of Senegalese junior high school students (N＝571, age10 – 20 years) from three schools located in Fatick province, Senegal. Participants answered self - report questionnaires in May 2013. The data was analyzed with factor analysis, reliability analysis with Cronbach alpha, t-test and One-way analysis of Variance (ANOVA) were …