Sökning: "hummingbirds"

Hittade 3 avhandlingar innehållade ordet hummingbirds.

  1. 1. Behavioural energetics : acquisition and use of energy by hummingbirds

    Författare :Staffan Tamm; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; hummingbirds; kolibri;

    Sammanfattning : .... LÄS MER

  3. 2. Clades in the "higher land bird assemblage"

    Författare :Ulf. S. Johansson; Scott V. Eswards; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Birds; Fåglar; Systematic Zoology; zoologisk systematik och evolutionsforskning;

    Sammanfattning : This thesis summarizes the results of several phylogenetic studies of birds included in the “higher land bird assemblage” (Anomalogonatae sensu Beddard 1898). The phylogenetic analyses are primarily based on gene sequences obtained from the nuclear genome (exons of the c-myc and RAG-1 genes and an intron of the myoglobin gene). LÄS MER

  4. 3. Feathers by day, membranes by night - Aerodynamic performance in bird and bat flight

    Författare :Florian Muijres; Evolutionär ekologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; animal flight; aerodynamics; vortex wake; actuator disk; flight performance; span efficiency; bird; bat; wind tunnel; PIV; Pied Flycatcher; Glossophaga soricina; Leptonycteris yerbabuenae;

    Sammanfattning : The efficiency and performance of a flying animal is directly related to the aerodynamics around its body and flapping wings. Here, I have developed methods for quantifying the wake dynamics around a flying animal. The results are used to estimate the aerodynamic performance of flapping flight. LÄS MER