Sök:

Sökresultat:

488 Uppsatser om Habitat preferences - Sida 4 av 33

Kära barn, det här handlar om din barndom : 9 vuxna berättar om sina erfarenheter av en utsatt barndom och samhällets insatser

The aim of this study is to describe and analyze how adults who grew up in an exposed habitat experienced their upbringing and society's efforts and how it affected them in adult life. The method that we used was qualitative interviews. This method has given us a rich material, we believe. The results were analyzed by means of the theory we used and past research in the field. All of our respondents have in common that they were insecure in childhood.  And everyone has had negative consequences of their childhood into adulthood.

Feeding preferences and foraging in Larvae of Manduca sexta and Spodoptera littoralis : a laboratory study based on olfaction

Larvae of Lepidopteran Manduca sexta and Spodoptera littoralis are pests of economical importance in several horticultural and agricultural crops. Knowledge of insect feeding preferences and behavior is crucial in order to find economically and ecologically sustainable solutions to the problems caused by these herbivores. The aim of this thesis was to study the behavior and the induced feeding preferences in larvae of M. sexta and S. littoralis when reared on certain host plants. The hypothesis was that larvae of M. sexta would have an innate preference for plants of the Solanaceae family and therefore discriminate the previously experienced nonhost when faced with the choice between a true host and the previous food source.

Statistiska metoder för härledning av indata till säkerhetsanalyser inom kärnkraftsområdet

Objective: In recent years there has been an increasing interest within the clinical (medical) science in measuring people?s health. When estimating quality of life, present practise is to use the EQ-5D questionnaire and an index which weighs the different questions. The question is what happens if the individuals estimate there own health, would it differ from the public preferences? The aim is to make a new prediction model based on the opinion of patients and compare it to the present model based on public preferences.Method: A sample of 362 patients with unstable coronary artery disease from the Frisc II trial, valued their quality of life in the acute phase and after 3, 6 and 12 months.

Påverkan av brunbjörnens habitatanvändning på älgens betesval

Det är vedertaget att rovdjur påverkar bytesdjurs val av område och beteende. Syftet med det här arbetet var att undersöka om rovdjurs användning av habitat har någon påverkan på svenska älgars födobeteende. I denna studie undersöks brunbjörnens påverkan på älg och datainsamlingen utfördes i björnrika områden i Dalarna och Gävleborgs län. De data som samlades in var data som rör bete (andel och höjd över marken) och habitatets egenskaper (sikt), därefter undersöktes om det förekom skillnader i andelen betat beroende på habitatanvändning av predator och habitatets egenskaper. Resultatet visade på tydliga skillnader i älgens betesmönster beroende på om det var hög eller låg predatoranvändning av habitat. Student tvåsidiga T-test och regressionsanalys användes för att ta reda på hur tillförlitliga resultaten var. Resultatet visade att det är en signifikant skillnad i älgens betesmönster (beteshöjd) beroende på i vilken utsträckning björnar använder habitatet. Älgens bete påverkades också av sikt från betesplatsen, vilket i sin tur var beroende av predatoranvändning inom habitatet, men den skillnaden var inte signifikant..

Effekt av habitat på täthetsdynamik mellan stensimpa och ung öring i svenska vattendrag

Öring (Salmo trutta) och stensimpa (Cottus gobio) är två vanligt förekommande arter i Sverige. En fråga som lyfts allt mer frekvent i olika artiklar och publikationer är hur dessa två arter påverkar varandra och vilka faktorer som påverkar denna interaktion. (Gabler & Amundsen 1999, Holmen et al. 2003, Elliot 2006, Hesthagen et al. 2010).

Politiska beslutskedjors uppkomst och utveckling - En fallstudie av ett politiskt beslutsfenomen

This study aims to investigate the origin and the development of a certain type of decision phenomena, namely political decision chains. A political decision chain is defined as a seemingly rational decision being made, that is reverted through a new decision and this for other reasons than the original decision being regarded as having fulfilled its intended purpose. The essay attempts to explain the occurrence of these decision chains through a case study in order to thoroughly examine the complexities that surround political decisions overall. The essay concludes that uncontrollable factors and chance to a large extent affect the origin of these chains, allowing actors to change the political agenda according to their preferences. The relative weighting of these factors that is made by the actors, which exist within the decision chain, makes them underestimate the relative power of other actors that may have different preferences.

Ett halvt steg ut i arbetslivet: - En studie om internships som interaktionsform mellan akademi och näringsliv

Internship is a new form of interaction between the academic world and the market and a phenomena increasingly popular among elite universities in Europe. The educational system has traditionally kept an academic approach where the institutions for higher education have acted isolated without extensive influence from the market. Today pressure from the market has led to intensified interaction between the universities and companies among many European elite universities. We have carried out a situational analysis concerning interaction between the academic institutions and companies in Europe. More specifically, we looked at the potential for Stockholm School of Economics (SSE) to strengthen its position on the educational market by adjusting its strategies and implement internships as a part of the education.

En jämförelse mellan individers självuppskattade livskvalitet och samhällets hälsopreferenser : En paneldatastudie av hjärtpatienter

Objective: In recent years there has been an increasing interest within the clinical (medical) science in measuring people?s health. When estimating quality of life, present practise is to use the EQ-5D questionnaire and an index which weighs the different questions. The question is what happens if the individuals estimate there own health, would it differ from the public preferences? The aim is to make a new prediction model based on the opinion of patients and compare it to the present model based on public preferences.Method: A sample of 362 patients with unstable coronary artery disease from the Frisc II trial, valued their quality of life in the acute phase and after 3, 6 and 12 months.

GIS-baserad habitatmodell för mindre hackspett, ett verktyg för att bevara skyddsvärda lövskogar inom Umeälvlandskapet :

Deciduous forests are, according to the National Environmental Quality Objectives, a priority area. Deciduous forests are rich in species and the occurrence of dead wood is an important factor for biodiversity. In order to identify valuable deciduous forests for bio-diversity, conservation needs good analyses and planning tools. Habitat models combined with geographic information systems can be used to study the spatial structure of suitable habitat. The Lesser spotted woodpecker (Dendrocopos minor) has been proposed as an indicator species for deciduous forests, since this species is highly specialized on insect larvae in dead wood and requires large areas of deciduous-rich environments. Many riparian forest with high species richness and high nature conservation values are found along the Ume river in Umeå municipality.

Bilden i bilderboken

In this thesis I investigate aesthetic preference for picture books among children aged 3?6 as well as criteria for preference among parents. Through my design project: illustration of a picture book, I aim to put my research on preference in the context of illustration and design. By using the design project as an applied method for research I have sought to answer how one as an illustrator can apply knowledge regarding preferences of the target groups when illustrating for picture books. I have primarily based my research within the field of cognitive developmental psychology, with primary focus on stage theory, and the field of literature.

Kan man genom kartstudier förutse häckningsframgång för ängshök (Circus pygargus) i Uppland? :

Montagu´s harrier (Circus pygargus) is a diurnal, Eurasian raptor, which migrates from its northern breeding grounds to winter in sub-Saharan Africa. In Sweden, its core breeding area is centred on the island of Öland, with a stable breeding population of approximately 40 pairs. The province of Uppland is on the northern end the distribution range, where 4-8 pairs have regularly bred since the 1980s. In Sweden, the Montagu?s harrier is classified as an endangered (EN) species. This classification is partly due to a lack of preferred nesting habitat, such as shrub-lands or dense wetlands with Claudium spp.

Lokala skillnader i konsumtion av påväxtalger och terrestra löv hos en differentierad population av Asellus aquaticus

That ecological and evolutionary processes can take place on the same time scale is a recent insight. Today we also know that they are directly linked to each other. In the lake Tåkern, in year 2000, there was a structural change when phytoplankton declined and submerged vegetation, mainly stoneworts began to spread. This led to evolutionary changes in the aquatic sowbug, Asellus aquaticus which had previously been limited to the reed, most likely feeding on detritus. But then, sowbugs could exploit the new habitat in stoneworts and a new food resource in terms of periphyton.

Utvecklingen av ett nytt såghandtag

SNA Europe?s handsaw concept is called ?Bahco Handsaw System? and is constituted by a saw handle with the possibility to switch between different saw blades. The sales of ?Bahco Handsaw System? products have not achieved the desired results probably due to the high price. Developing a more cost efficient handle, enabling a lower consumer price of the product, is assumed to increase the sales volume.

Differences in host plant preferences and olfactory physiology between populations of the moth Spodoptera littoralis established in Egypt and Benin

This study was made to compare and distinguish any differences in olfactory recognition and host plant adaptation between two strains of cotton leaf worm, Spodoptera littoralis. The populations used were established in Egypt and Benin, Africa. The documentation consisted of information about (1) each of the strains development through the larval stage up to pupation on diets of cotton, clover and cowpea. (2) Their oviposition preferences as adults between cotton, clover, cowpea, maize and cabbage. (3) Electroantennographic recordings to quantify any possible responses to plant volatiles. Throughout the diet experiments the larvae from the Benin strain showed significantly a better development between artificial, clover, cowpea and cotton respectively, while the Egypt strain had significance between artificial, cotton and cowpea/clover as diet. Also noted was how the strains substantial development of weight differentiated if fed the cotton diet, followed by the cowpea diet showing that the Benin strain would develop a higher body mass on a cotton diet as well as on a cowpea diet. This trend was however switched once the pupal stage was reached, where the Egyptian strain contained a significantly greater body mass than the Benin strain on the artificial and the Benin strain a greater on cowpea, which suggests that in the end, the Benin strain develops significantly better on cowpea while the Egypt strain develops better on an artificial diet. During the oviposition experiment that both stains showed a clear difference in hierarchy of host plants considered suitable for oviposition, where the Egyptian strain is significantly more attracted to clover than the Benin strain. Also showed with electroantennographic recordings and significant values was the higher sensitivity the Egypt strain had towards (E)2-hexenal, (E/Z)-b-ocimene, (Z)-3-hexenyl acetate, Nonanal, (-)-linalool and ?-myrcene when compared to the responses from the Benin strain..

Gis och realtids-GPS på renar : renens habitatanvändning i brukad skog - två vintersäsonger i Vilhlemina Norra Sameby

This study is commissioned by the Swedish University of Agricultural Science (SLU - Department of Forest Resource Management) in coorporation with Sveaskog and Vilhelmina Norra Sami reindeer herding community. The purpose of this study is to analyse movement patterns and habitat use of reindeers during two winter seasons (2005/2006 and 2006/2007) in areas affected by forestry activities such as clearcutting. This study examines the possibilities of analysing information from Reindeer husbandry plans and forest variable data from kNN and SMD, in relation to GPS collar points from reindeers by using Geographical Information System (GIS). Lack of knowledge and understanding between the reindeer industry and the timber industry has often led to heated debates. The possibilities of using this type of technique are very interesting and could increase knowledge concerning land-use issues to different resource users. The main results from analyses comparing SMD, kNN, data about clearcuts, and GPS collar points from reindeers indicates that clearcut areas, younger forest, coniferous forest on lichen-dominated areas and areas dominated by pine was preferred by reindeers during the winter period.

<- Föregående sida 4 Nästa sida ->