Search results for "koira"
showing 10 items of 48 documents
Age, condition and dominance-related sexual ornament size before and during the breeding season in the black grouse Lyrurus tetrix
2018
Male ornaments function as honest cues of male quality in many species and are subject to intra- and intersexual selection. These ornaments are generally studied during peak expression, however their size outside the breeding season may determine ultimate ornament size and costliness, and as such reproductive success. We investigated whether male black grouse Lyrurus tetrix eye comb size was related to age, condition and measures of male dominance before and during the breeding season. Total combined eye comb size began to increase ~70 d before the start of the breeding season. Adult males (aged ≥ 2 yr old) had consistently larger eye combs than younger males (1 yr old) both before and duri…
Koira haudattuna : koiran ja sen kuoleman representoiminen blogiteksteissä
2015
Pro gradussani tutkin, kuinka koiransa menettäneet ihmiset luovat internetissä kuvaa menehtyneistä koiristaan ja koiran kuolemasta. Tutkimukseni tavoitteena on selvittää, millaista kuvaa koirista ja niiden kuolemasta luodaan blogeissa, ja millaisin kielen keinoin tämä tapahtuu. Aihetta ei ole suomen kielen näkökulmasta aiemmin tutkittu, vaikka koiran kuolema koskettaakin meistä monia. Tutkimuskysymykseni ovat seuraavanlaiset: Millaisilla kielen keinoilla menehtynyttä koiraa representoidaan blogeissa? Millaisilla kielen keinoilla koiran kuolemaa representoidaan blogeissa? Millaisien diskurssien kautta koiraa ja sen kuolemaa kuvataan, ja millainen kuva koirasta ja kuolemasta muodostuu? Tutkim…
Observing animals and humans : dogs target their gaze to the biological information in natural scenes
2020
Background This study examines how dogs observe images of natural scenes containing living creatures (wild animals, dogs and humans) recorded with eye gaze tracking. Because dogs have had limited exposure to wild animals in their lives, we also consider the natural novelty of the wild animal images for the dogs. Methods The eye gaze of dogs was recorded while they viewed natural images containing dogs, humans, and wild animals. Three categories of images were used: naturalistic landscape images containing single humans or animals, full body images containing a single human or an animal, and full body images containing a pair of humans or animals. The gazing behavior of two dog populations,…
Urheilujournalismi vallan vahtikoirana? : tapauskohtaisessa tarkastelussa huippu-urheilun muutostyötä käsittelevä uutisointi suomalaisissa sanomalehd…
2018
Artikkelin tutkimuskohteena on suomalaisen sanomalehdistön uutisointi vuosina 2010–2012 tehdystä huippu-urheilun muutostyöstä, jota opetus- ja kulttuuriministeriö rahoitti 2,6 miljoonalla eurolla. Tutkimuksen tavoitteena on selvittää, millainen vallan vahtikoira urheilujournalismi on. Tutkimusaineisto koostuu levikiltään kolmen Suomen suurimman päivälehden (Aamulehti, Helsingin Sanomat ja Turun Sanomat) ja maan molempien iltapäivälehtien (Iltalehti ja Ilta-Sanomat) kaikesta muutostyötä käsittelevästä uutisoinnista lehtien painetuissa versioissa. Tarkasteluajanjakso on rajattu Huippu-urheilun muutosryhmän (HuMu) loppuraportin julkistamista (5.12.2012) seuranneelle puolen vuoden ajalle (6.12.…
Koira kulttuurin asukkina
2019
Stabilising selection on immune response in male black grouse Lyrurus tetrix
2017
Illnesses caused by a variety of micro- and macro- organisms can negatively affect individuals’ fitness, leading to the expectation that immunity is under positive selection. However, immune responses are costly and individuals must trade-off their immune response with other fitness components (e.g. survival or reproductive success) meaning that individuals with intermediate response may have the greatest overall fitness. Such a process might be particularly acute in species with strong sexual selection because the condition-dependence of male secondary sexual-traits might lead to striking phenotypic differences amongst males of different immune response levels. We tested whether there is s…
Time-resolved classification of dog brain signals reveals early processing of faces, species and emotion
2020
Dogs process faces and emotional expressions much like humans, but the time windows important for face processing in dogs are largely unknown. By combining our non-invasive electroencephalography (EEG) protocol on dogs with machine-learning algorithms, we show category-specific dog brain responses to pictures of human and dog facial expressions, objects, and phase-scrambled faces. We trained a support vector machine classifier with spatiotemporal EEG data to discriminate between responses to pairs of images. The classification accuracy was highest for humans or dogs vs. scrambled images, with most informative time intervals of 100–140 ms and 240–280 ms. We also detected a response sensitive…
The evolution of mating preferences for genetic attractiveness and quality in the presence of sensory bias.
2022
The aesthetic preferences of potential mates have driven the evolution of a baffling diversity of elaborate ornaments. Which fitness benefit—if any—choosers gain from expressing such preferences is controversial, however. Here, we simulate the evolution of preferences for multiple ornament types (e.g., “Fisherian,” “handicap,” and “indicator” ornaments) that differ in their associations with genes for attractiveness and other components of fitness. We model the costs of preference expression in a biologically plausible way, which decouples costly mate search from cost-free preferences. Ornaments of all types evolved in our model, but their occurrence was far from random. Females typically p…
Proposed Protocol for Field Testing of Endurance Fitness of Young Labrador Retrievers
2023
The number of dogs and, with it, dog sports are growing in popularity, and the training of dogs begins at an early age. Although fitness testing is an imperative part of purposeful training and sports, to our knowledge, no objective field tests are available for measuring young dogs’ endurance fitness. The aim of this study is to describe a simple, easy-to-repeat, and inexpensive way to test training intervention effects on endurance fitness in young Labrador Retrievers. Healthy client-owned 16-week-old Labrador Retrievers will be recruited and divided into test and control groups. The test group will have an eight-week training program followed by a four-week detraining period, while the c…
No room for males in caves : Female‐biased sex ratio in subterranean amphipods of the genus Niphargus
2021
Sex allocation theory predicts that the proportion of daughters to sons will evolve in response to ecological conditions that determine the costs and benefits of producing each sex. All else being equal, the adult sex ratio (ASR) should also vary with ecological conditions. Many studies of subterranean species reported female-biased ASR, but no systematic study has yet been conducted. We test the hypothesis that the ASR becomes more female-biased with increased isolation from the surface. We compiled a dataset of ASRs of 35 species in the subterranean amphipod Niphargus, each living in one of three distinct habitats (surface-subterranean boundary, cave streams, phreatic lakes) representing …