Search for dissertations about: "Visual ecology"

Showing result 1 - 5 of 31 swedish dissertations containing the words Visual ecology.

  1. 1. Cryptic coloration, microhabitat choice and polymorphism in Idotea baltica (Isopoda)

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Sami Merilaita; Uppsala universitet.; [1999]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ecology; Ekologi; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology; NATURVETENSKAP Biologi Terrestisk; limnisk och marin ekologi; Animal Ecology; zooekologi;

    Abstract : In this thesis I have studied cryptic coloration, microhabitat use and colour polymorphism in the marine isopod Idotea baltica. In the Baltic Sea it lives and feeds mainly on the seaweed Fucus vesiculosus, which in sheltered sites usually is whitespotted on its lower parts due to epizoites. The white-spotted morph of I. READ MORE

  2. 2. Ecology of red admiral migration

    University dissertation from Department of Animal Ecology, Lund University

    Author : Oskar Brattström; Lund University.; Lunds universitet.; [2007]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Nymphalidae; Lepidoptera; migration patterns; migration; genetic structure; AFLP; lipid content; Inachis io; stable isotopes; orientation; navigation; weather; Animal ecology; red admiral; Vanessa atalanta; Djurekologi;

    Abstract : The red admiral (Vanessa atalanta) is a migratory butterfly that can be found in North America, North Africa, Europe and some parts of Asia. In Europe the main part of the population spend winter in the Mediterranean region and the following spring leave this area to breed further to the north. READ MORE

  3. 3. Fish foraging under visual constraints

    University dissertation from Department of Biology, Lund University

    Author : Mikael Jönsson; Lund University.; Lunds universitet.; Lund University.; Lunds universitet.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; planktivore.; piscivore; brownification; visual foraging; Turbidity;

    Abstract : Visual conditions are changing in several different ways. Some lakes are getting turbid due to eutrophication or erosion while others are getting browner due to brownification. These two types of visual degradation results in completely different optical properties of lakes. READ MORE

  4. 4. Piscivore-prey fish interactions - consequences of changing optical environment

    University dissertation from Department of Biology, Lund University

    Author : Lynn Ranåker; Lund University.; Lunds universitet.; Lund University.; Lunds universitet.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; behaviour; brownification; freshwater ecosystems; growth; piscivore-prey fish interactions; selectivity; turbidity;

    Abstract : Predator-prey interactions are a primary structuring force in aquatic systems. A change in the predator-prey interactions may cause a change in the strength of trophic cascades and even resulting in ecosystem shifts. READ MORE

  5. 5. Odour-mediated nectar foraging in the silver Y moth, Autographa gamma

    University dissertation from Chemical Ecology and Ecotoxicology, Department of Biology, Lund University

    Author : Dainius Plepys; Lund University.; Lunds universitet.; [2001]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; predation risk; Noctuidae; Lepidoptera; flight tunnel; GC-EAD; single sensillum; sprayer; ultrasound; floral volatiles; attraction; foraging; mate-finding; lilac aldehydes; olfactory receptor neurones; Ecology; Ekologi; Chemistry; Kemi;

    Abstract : It is well established that floral odours play a significant role in the nectar foraging behaviour in Lepidoptera and other insect orders. Floral odour may elicit searching, alighting and feeding behaviours alone or in concert with visual stimuli. READ MORE