Search results for "valinta"

Kompleksisen luokitellun aineiston riippuvuusrakenteen pelkistäminen : sovellus ylioppilaskirjoitusaineistoon

2009

Vanhemmat lastensa kouluvalintojen toteuttajina

1998

Musiikinopettajana yliopistojen varhaiskasvatuksen yksiköissä ja ammattikorkeakoulujen sosiaalialan linjoilla

1998

An aposematic colour‐polymorphic moth seen through the eyes of conspecifics and predators – Sensitivity and colour discrimination in a tiger moth

2018

Although predation is commonly thought to exert the strongest selective pressure on coloration in aposematic species, sexual selection may also influence coloration. Specifically, polymorphism in aposematic species cannot be explained by natural selection alone. Males of the aposematic wood tiger moth (Arctia plantaginis) are polymorphic for hindwing coloration throughout most of their range. In Scandinavia, they display either white or yellow hindwings. Female hindwing coloration varies continuously from bright orange to red. Redder females and yellow males suffer least from bird predation. White males often have higher mating success than yellow males. Therefore, we ask whether females ca…

Safety in Numbers: How Color Morph Frequency Affects Predation Risk in an Aposematic Moth

2021

Polymorphic warning signals in aposematic systems are enigmatic because predator learning should favor the most common form, creating positive frequency-dependent survival. However, many populations exhibit variation in warning signals. There are various selective mechanisms that can counter positive frequency-dependent selection and lead to temporal or spatial warning signal diversification. Examining these mechanisms and their effects requires first confirming whether the most common morphs are favored at both local and regional scales. Empirical examples of this are uncommon and often include potentially confounding factors, such as a lack of knowledge of predator identity and behavior. …

Heterozygote advantage and pleiotropy contribute to intraspecific color trait variability

2022

The persistence of intrapopulation phenotypic variation typically requires some form of balancing selection because drift and directional selection eventually erode genetic variation. Heterozygote advantage remains a classic explanation for the maintenance of genetic variation in the face of selection. However, examples of heterozygote advantage, other than those associated with disease resistance, are rather uncommon. Across most of its distribution, males of the aposematic moth Arctia plantaginis have two hindwing phenotypes determined by a heritable one locus-two allele polymorphism (genotypes: WW/Wy = white morph, yy = yellow morph). Using genotyped moths, we show that the presence of o…

Weak warning signals can persist in the absence of gene flow

2019

Aposematic organisms couple conspicuous warning signals with a secondary defense to deter predators from attacking. Novel signals of aposematic prey are expected to be selected against due to positive frequency-dependent selection. How, then, can novel phenotypes persist after they arise, and why do so many aposematic species exhibit intrapopulation signal variability? Using a polytypic poison frog (Dendrobates tinctorius), we explored the forces of selection on variable aposematic signals using 2 phenotypically distinct (white, yellow) populations. Contrary to expectations, local phenotype was not always better protected compared to novel phenotypes in either population; in the white popul…

Multimodal Aposematic Signals and Their Emerging Role in Mate Attraction

2018

Viittova monikielinen lapsi : vanhempien kokemuksia viittomakielisen lapsen monikielisyydestä resurssina

2012

Työni tutkii viittomakielisen monikielisen perheen vanhempien kokemuksia perheensä ja lapsensa monikielisyydestä. Tavoitteena on selvittää, miten monikielisyyden resurssi ilmenee viittomakielisessä perheessä, jossa käytetään kahta eri viittomakieltä sekä kuinka vanhemmat kokevat perheensä monikielisyyden arjessa. Työn pyrkimyksenä oli saada vanhemmat reflektoimaan itseään heidän omien kokemustensa kautta ja antaa tukea lisäämällä vanhempien tietoisuutta perheensä monikielisyydestä. Tutkimuksen teoreettisena viitekehyksenä on Bronfenbrennerin (1979) luoma ekologinen kehitysmalli. Ekologisessa teoriassa lapsen kasvuympäristö koostuu eritasoisista, sisäkkäisistä tasoista. Bronfenbrenner jakaa …

Oikealle alalle? : logistiikka-alan ammattikoulutuksen ja työelämän osaamisen todellisuuksien kohtaaminen

2016

The aim of this doctoral thesis was to study how vocational education and training (VET) and working life encounter each other. Naturally the research topic chosen was selected from the researcher´s own professional field, i.e., logistics education. The research task was to examine, how VET-students' professional expectations in the study field of logistics encounter with the working life realities. The main research question was “How do the logistics (driver training) students’ vocational expectations encounter with the requirements of dynamically changing working life from the point of view of the vocational competence, the time span of 2001-2025?” The two sub-questions were 1) How do the…