Search results for "VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480"
showing 10 items of 87 documents
A multilevel statistical toolkit to study animal social networks: the Animal Network Toolkit Software (ANTs) R package
2020
Abstract The possible role played by individual attributes, sociodemographic characteristics and/or ecological pressures in the interaction between animals and the development of social relationships between them is of great interest in animal ecology and evolutionary biology. Social Network Analysis is an ideal tool to study these types of questions. The Animal Network Toolkit Software (ANTs) R package was specifically developed to provide all the different social network analysis techniques currently used in the study of animal social networks. This global package enables users to (1) compute global, polyadic and nodal network measures; (2) perform data randomisation: data stream and netw…
Kartlegging av laks og ørret i kystvassdrag i Agder ved studier av miljø-DNA
2021
Master's thesis in Coastal ecology (BIO501) Both Atlantic salmon (Salmo salar) and Brown trout (Salmo trutta) spawn in freshwaters, and availability to water courses of good water quality is of great importance for the Salmonidae populations. The industrial revolution introduced release of considerable amounts of sulphur and nitrogen taken up by the environments, including aquatic habitats. Through the 20thcentury, the pH levels dramatically dropped while levels of toxic aluminium rose in the freshwaters. The acidic and toxic waters strongly affected the salmon populations, and several of the stocks of south Norwegian rivers were eliminated. The trout, however, have managed the decrease in …
Classification of pig calls produced from birth to slaughter according to their emotional valence and context of production
2022
Vocal expression of emotions has been observed across species and could provide a non-invasive and reliable means to assess animal emotions. We investigated if pig vocal indicators of emotions revealed in previous studies are valid across call types and contexts, and could potentially be used to develop an automated emotion monitoring tool. We performed an analysis of an extensive and unique dataset of low (LF) and high frequency (HF) calls emitted by pigs across numerous commercial contexts from birth to slaughter (7414 calls from 411 pigs). Our results revealed that the valence attributed to the contexts of production (positive versus negative) affected all investigated parameters in both…
Kopepoder langs Skagerrakkysten - En oversikt basert på morfologisk og molekylærgenetisk identifisering
2018
Masteroppgave akvatisk økologi BIO500 - Universitetet i Agder 2018 Konfidensiell til / confidential until 01.07.2023
Mating activity and parturition of the smooth snake Coronella austriaca in Norway
2022
Risk assessment of the biocontrol product Nemaslug 2.0 with the active organisms Phasmarhabditis californica (strain P19D) and Moraxella osloensis. S…
2021
First record of the opal chimaera, Chimaera opalescens (Holocephali: Chimaeridae) and revision of the occurrence of the rabbitfish Chimaera monstrosa…
2020
The presence of the opal chimaera, Chimaera opalescens, is reported for the first time in the deep waters of the Azores, with the capture of four specimens by fishermen and the video recording of an additional five individuals. Species identification was supported by the 646 bp sequenced fragment of the mitochondrial gene cytochrome oxidase subunit I. Because C. opalescens is a recently recognised species that had been recurrently misidentified as rabbitfish, Chimaera monstrosa, the historical data of C. monstrosa in the Azores were reviewed to assess the possible presence of both Chimaera species in the region. Although several authors have reported the occurrence of C. monstrosa in the Az…
Våre beste hår. Stillongs og parkas og tre lag med ull. Hvorfor beholdt vi ikke heller bare pelsen?
2019
Forskningstorg
2019
Kartlegging av biodiversitet av fisk i Raet nasjonalpark ved hjelp av eDNAanalyse
2020
Master's thesis in Coastal ecology (BIO501)