Sökning: "rana arvalis"

Hittade 4 uppsatser innehållade orden rana arvalis.

  1. 1. Countergradient variation and compensatory growth in Moor frog (Rana arvalis) along a replicated latitudinal gradient

    Master-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildning

    Författare :Sohini Mallick; [2022]
    Nyckelord :moor frog; countergradient variation; compensatory growth; latitudinal gradient;

    Sammanfattning : For evolution to occur over time, it is necessary for animals and plants to show phenotypic variation. If the individuals within populations of a species do not show observable differences among themselves, there will be a lack of driving force for natural selection to act on and decide which characteristic gets inherited from one generation to the next. LÄS MER

  3. 2. Local adaptation of larval life history in the moor frog Rana arvalis across a landscape mosaic

    Master-uppsats, Institutionen för biologisk grundutbildning; Populationsbiologi och naturvårdsbiologi

    Författare :Monique Lustenhouwer; [2012]
    Nyckelord :rana arvalis; moor frog; growth rate; local adaptation; life history; landscape mosaic; predation;

    Sammanfattning : Growth rate is an important life history trait, which impacts fitness indirectly through its effect on the age and size at maturity, as well as directly through costs associated with accelerated growth such as increased predation risk. Genetic variation and plasticity in growth are widespread in nature, and local adaptation of growth rate may evolve due to divergent selection in different environments, for example related to predation risk, temperature or time constraints. LÄS MER

  4. 3. Amphibian and reptile distribution in forests adjacent to watercourses

    Magister-uppsats, Fakulteten för samhälls- och livsvetenskaper

    Författare :Cecilia Olsson; [2008]
    Nyckelord :Rana arvalis; Rana temporaria; Natrix natrix; Lacerta vivpara; deciduous trees; canopy cover; woody debris; bare ground;

    Sammanfattning : Worldwide amphibians and reptiles are declining with habitat fragmentation and destruction as the primary cause. Riparian areas are important for the herpetofauna, but as land is converted to agriculture or harvested for timber the areas are diminishing. LÄS MER

  5. 4. Anuran colonization of newly constructed ponds : The importance of time and distance to source populations

    Magister-uppsats, Sektionen för ekonomi och teknik (SET)

    Författare :Jimmy Almhagen; [2007]
    Nyckelord :anurans; colonization; dispersal; pond construction; moor frog; common frog; common toad;

    Sammanfattning : Dispersal is an important factor in animal ecology. Anurans (frogs and toads) are often philopatric (home loving) but some specimens in a population usually have the capacity to disperse relatively long distances. LÄS MER