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Showing result 1 - 5 of 23 essays matching the above criteria.

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

    University essay from Uppsala universitet/Institutionen för biologisk grundutbildning

    Author : Sohini Mallick; [2022]
    Keywords : moor frog; countergradient variation; compensatory growth; latitudinal gradient;

    Abstract : 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. READ MORE

  3. 2. Life history and reproductive fitness variation associated with the Y chromosome in Callosobruchus maculatus

    University essay from Uppsala universitet/Institutionen för biologisk grundutbildning; Uppsala universitet/Institutionen för ekologi och genetik

    Author : Maria Revenikioti; [2021]
    Keywords : Y chromosome; life-history traits; seed beetle Callosobruchus maculatus; reproductive fitness;

    Abstract : In the seed beetle Callosobruchus maculatus, the female is the larger sex and the male is the smaller sex. However, males that are almost as large as females can also occur, which is due to a specific Y chromosome haplotype. READ MORE

  4. 3. Friends with benefits? - Does gut microbiota of Spodoptera littoralis affect insecticide resistance and are there any costs of insecticide resistance development?

    University essay from SLU/Dept. of Plant Protection Biology

    Author : Sarah Heithausen; [2021]
    Keywords : insecticide resistance development; gut microbiota; gut symbiont-mediated resistance; trade-off effects; fitness costs; symbiosis; survival; life-history traits; fecundity;

    Abstract : The insect gut microbiota has many important functions for insects such as detoxification of host plant toxins. Recently there has been a growing interest on the effect of insect gut microbiota on insecticide resistance development. Insecticide resistance is a growing concern for food security and sustainable agriculture. READ MORE

  5. 4. The effect of temperature on life history traits of perch (Perca fluviatilis) and its implications for population age- and size structure

    University essay from SLU/Dept. Of Aquatic Resources

    Author : Malin Karlsson; [2020]
    Keywords : Specific growth; von Bertalanffy growth model; Mortality; Size structure; Size-spectra; Fish; Perch; Perca fluviatilis; Climate change;

    Abstract : The effects of increasing water temperature on key life history traits of fish (e.g. growth rate and maximum body size) have in recent years received considerable attention, but evidence remains inconclusive. READ MORE

  6. 5. The effect of sexual selection and mating on personality traits and behavior consistency of Callosobruchus maculatus

    University essay from Uppsala universitet/Institutionen för biologisk grundutbildning

    Author : Jiaqi Lu; [2019]
    Keywords : seed beetles; sexual selection; mating; personality traits;

    Abstract : Animals’ personality traits are defined as consistent behavior tendencies and the function of them in life-history strategy and reproductive success has been given a lot of explanations in a large amount of research. However, the behavior consistency of individuals in different sexes, mating status and selection regimes is rarely mentioned. READ MORE