Search results for "Evoluutio"
showing 6 items of 176 documents
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
Behavioural, ecological, and evolutionary aspects of diversity in frog colour patterns
2017
The role of colours and colour patterns in behavioural ecology has been extensively studied in a variety of contexts and taxa, while almost overlooked in many others. For decades anurans have been the focus of research on acoustic signalling due to the prominence of vocalisations in their communication. Much less attention has been paid to the enormous diversity of colours, colour patterns, and other types of putative visual signals exhibited by frogs. With the exception of some anecdotal observations and studies, the link between colour patterns and the behavioural and evolutionary ecology of anurans had not been addressed until approximately two decades ago. Since then, there has been eve…
"Emmä täältä mitään etsi, kulutan vain aikaa" : itsenäisten äitien käsityksiä chattaamisesta
2007
Pro gradu–tutkielmani käsittelee jyväskyläläisten itsenäisten äitien käsityksiä chattaamisesta eräällä Internetin chattikanavalla. Käsitteellä itsenäinen äiti tarkoitan äitiä, joka on tutkimuksen tekohetkellä ollut eronneena tai eroamassa lapsen/lastensa isästä. Tutkielmani tarkoitus on kognitiivisen kulttuuritutkimuksen avulla tuoda esiin niitä käsityksiä, joita itsenäisillä äideillä on chattaamisesta; miksi he chattaavat ja millaisia kokemuksia heillä on toiminnastaan. Tutkimuksen aineisto muodostuu kahdeksan informanttini teemahaastattelusta sekä osallistuvasta havainnoinnista chattikanavalla. Tutkielmani aihepiiri liittyy käsillä olevaan kulttuuriseen muutokseen, jonka olennainen piirre…
Entrepreneurs and Growth : An Option, Obligation or Obsession?
2018
“Growth” as a word carries a positive tone in it; human beings grow and mature, gaining new knowledge and resources, and so do companies. Growth, however, has never been for all. In competitive markets, some grow and others do not—or grow at slower pace than others. Furthermore, growth is a process that strains the capabilities and resources of an individual, company, and its acting entrepreneurs to their extreme. Growth means also learning and leaving behind something learned of possessed before. Growth disrupts the history and path of a single company and its entrepreneur. The text synthetizes the scattered literature in growth and entrepreneurship. A case study shows how growth is viewed…
Phylogeny and evolution of parthenogenesis in Finnish bagworm moth species (Lepidoptera : Psychidae : Naryciinae) based on mtDNA-markers
2005
We investigated species diversity and evolution of parthenogenesis among bagworm moth species of Dahlica and Siederia using mitochondrial DNA sequencing. Parthenogenesis is rare among Lepidoptera other than Psychidae. Genera Dahlica and Siederia form a confusing group with controversial species boundaries and widely overlapping morphological features that make species determination difficult. We evaluated the reliability of species determination based on wing scale morphology by comparing it with a phylogenetic tree obtained using mtDNA. Species determination based on morphological characteristics did not correspond to species determination based on mtDNA markers. On the basis of the molecu…