Search results for "lek"
showing 10 items of 2808 documents
Evolution of black grouse leks: female preferences benefit males in larger leks
1992
Mate sampling behaviour of black grouse females (Tetrao tetrix)
1995
We studied female mate sampling behaviour in lekking black grouse (Tetrao tetrix). Females mainly visited males occupying territories in the centre of the lek with relatively large territories. They were also more likely to visit males that had high attendance. The same factors were also correlated with male mating success. A multiple regression model including these factors explained more of the variance in female visits per male (53%) than in mating success (33%). The pattern of female sampling conformed with a pool comparison (best-of-n) tactic. Such a tactic is expected if the costs of sampling are low. Females of high body mass visited more males than lighter females, however, which in…
Lek centre attracts black grouse females
1994
In several lek mating systems, centrally located males enjoy higher mating success than peripheral males. The mechanism behind this pattern, however, has been controversial and a rigorous test of the different alternatives is missing. Here we report that in black grouse Tetrao tetrix , a lekking bird species, central males achieved many more copulations than males in the periphery. Generally, central territories were smaller than peripheral ones, and males were thus more clumped in the centre. A choice experiment in an aviary provided experimental support for females being attracted to densely clustered males, so that males in larger clusters have higher expected average mating success. Thu…
Why Do Black Grouse Males Perform on Lek Sites outside the Breeding Season?
1999
Studies of sexual selection have focused mainly on explanations of how male characteristics influence mating success during the breeding season. By contrast, few studies have investigated how behaviours prior to the breeding season influence mate choice d
Combs and sexual selection in black grouse (Tetrao tetrix)
2000
We studied supra-orbital combs in lekking black grouse (Telrao tetrix) in relation to sexual selection at five leks in Finland 1991-1998 and four leks in Sweden 1992-1995. Comb size was estimated in two ways: by observing its natural size in the field at
Användning av lekar och spel i svenskundervisning
2011
Tutkielmani aiheena ovat pelit ja leikit ruotsinopetuksessa. Tarkoituksenani oli tulevana ruotsin opettajana selvittää käyttävätkö opettajat pelejä ja leikkejä osana opetustaan. Tämän lisäksi halusin myös saada selville millaisia pelejä ja leikkejä tunneilla käytetään, sekä milloin ja miksi pelaamista ja leikkimistä kannattaa hyödyntää ruotsinopetuksessa. Tutkimukseni on kvalitatiivinen ja keräsin tutkimusaineiston teemahaastattelun avulla. Haastatteluun osallistui neljä ruotsinopettajaa, joista kolme toimii opettajina Normaalikoulussa ja yksi Rudolf Steiner -koulussa. Haastattelussa opettajilta kysyttiin avoimia kysymyksiä pelien ja leikkien käytöstä heidän opetuksessaan. Kaikki tutkimukse…
Baltu filoloģija, 25 (1)
2016
Das Lernerwörterbuch aus der Benutzerperspektive : Untersuchung am Beispiel des De Gruyter Wörterbuchs Deutsch als Fremdsprache
2002
Tracking Polariton Relaxation with Multiscale Molecular Dynamics Simulations
2019
When photoactive molecules interact strongly with confined light modes in optical cavities, new hybrid light–matter states form. They are known as polaritons and correspond to coherent superpositions of excitations of the molecules and of the cavity photon. The polariton energies and thus potential energy surfaces are changed with respect to the bare molecules, such that polariton formation is considered a promising paradigm for controlling photochemical reactions. To effectively manipulate photochemistry with confined light, the molecules need to remain in the polaritonic state long enough for the reaction on the modified potential energy surface to take place. To understand what determine…