Essays about: "offspring survival"

Showing result 1 - 5 of 28 essays containing the words offspring survival.

  1. 1. Neophobia and parental care in collared flycatchers (Ficedula albicollis)

    University essay from Uppsala universitet/Institutionen för biologisk grundutbildning

    Author : Maja Svedberg; [2023]
    Keywords : Neophobia; collared flycatcher; ficedula albicollis; parental care;

    Abstract : Parental care can be important especially in passerine birds and can depend on environment, food availability and behaviour. A behaviour that can affect the food supply for the offspring is neophobia, the fear of novel objects. The more fear the bird exhibits the less it visits the nest with food. READ MORE

  3. 2. Intergenerational Transmission of Health and Life span : An Exploration of an Association Between Parental Age-at-Death and Disease Outcomes in Offspring

    University essay from Stockholms universitet/Institutionen för folkhälsovetenskap

    Author : Anna Thalén; [2022]
    Keywords : Life span; intergenerational health; parental age-at-death; disease risk; longevity; hospitalization;

    Abstract : Parental and offspring life spans are modestly associated and a transmission of disease risk from parents to offspring has been proposed as a possible explanation. Using birth cohort data consisting of 86 168 offspring and their parents, the aim of this explorative study was to quantify and describe the association between parental age-at-death and risk of disease in offspring over a 33-year follow-up period. READ MORE

  4. 3. Evolutionary Theories of Menopause

    University essay from Linköpings universitet/Institutionen för fysik, kemi och biologi

    Author : Fanny Hägg; [2020]
    Keywords : Menopause; Post-reproduction; The grandmother hypothesis; The reproductive conflict hypothesis; Inclusive fitness; Kin selection; Odontoceti; Orcinus orca;

    Abstract : Menopause, the cessation of female reproduction well before death, is a puzzling phenomenon, because evolutionary theory suggests there should be no selection for survival when reproduction has ended. Nevertheless, menopause does exist in a limited number of species, and besides humans it has predominately evolved among toothed whales (Odontoceti). READ MORE

  5. 4. Self-adaptive random walk with pesudo-gradients for genetic evolution of an artificial neural network

    University essay from Lunds universitet/Beräkningsbiologi och biologisk fysik - Genomgår omorganisation

    Author : Robin Emanuelsson; [2020]
    Keywords : Physics and Astronomy;

    Abstract : To optimize the weights in an artificial neural network most methods rely gradients, which are not always obtainable or desirable. Evolutionary algorithms are instead based on Darwinian evolution where no derivative is needed. READ MORE

  6. 5. Phenotypic correlates of spawning migration behaviour for roach (Rutilus rutilus) and ide (Leuciscus idus) in the stream Oknebäcken, Sweden.

    University essay from Linnéuniversitetet/Institutionen för biologi och miljö (BOM)

    Author : Emma Lindbladh; Johanna Eriksson; [2020]
    Keywords : Anadromous; cyprinids; diadromous; fish migration; ide; leuciscus idus; migration barriers; PIT-tag; roach; rutilus rutilus; sex ratio; spawning migration; Sweden;

    Abstract : Migration occurs among many animal species for the purpose of, among other things, finding food or to reproduce. Spawning migration is a form of migration that occurs among many fish species where they move to another site for reproduction. The movement can be obstructed by migration barriers like road culverts. READ MORE