Essays about: "life-history traits"

Showing result 16 - 20 of 23 essays containing the words life-history traits.

  1. 16. Sexual selection and extinction in deer

    University essay from Uppsala universitet/Institutionen för biologisk grundutbildning

    Author : Saloume Bazyan; [2013]
    Keywords : Sexual selection; Extinction; Cervidae; Size dimorphism; mating system;

    Abstract : By performing a comparative analysis and using phylogenetic relationships of the Cervidaefamily this study aimed to address whether or not sexual selection may play a role in the extinctionof species by making species more vulnerable to extinction. The role of sexual selection in makingspecies more vulnerable to extinction is largely unexplored, and several factors such as ecologicaland life history traits may increase the risk of extinction. READ MORE

  3. 17. Evolutionary pressures under the current fishing practices in European hake (Merluccius merluccius)

    University essay from Lunds universitet/Examensarbeten i biologi

    Author : Dunja Jusufovski; [2013]
    Keywords : Biology and Life Sciences;

    Abstract : Abstract There is a rising concern involving the impact of modern fisheries on the dynamics and viability of the exploited fish populations. The increasing fishing pressure has been recorded to cause declines in age and size at maturation in variety of marine fish species. READ MORE

  4. 18. Personality and production in dairy cows

    University essay from Zoologi; Tekniska högskolan

    Author : Louise Hedlund; [2013]
    Keywords : behaviour; coping style; milk production; novel object; temperament; social separation; step-kick;

    Abstract : Variation in animal personality, in other words, behavioural responses consistent within individuals over time and/or across contexts, is predicted to be related to life-history traits, such as growth rate and investment in reproduction. How this translates into relationships between personality and milk production in dairy cows is however scarcely investigated and previous studies are showing contradicting results. READ MORE

  5. 19. Hur livshistoriekaraktärer hos Europeisk abborre (Perca fluviatilis L.) påverkas av cykliska förändringar i populationsstrukturen

    University essay from SLU/Dept. of Wildlife, Fish and Environmental Studies

    Author : Christian Andersson; [2012]
    Keywords : abborre ; Perca fluviatilis; livshistoria; tusenbröder; ålder; längd och vikt vid könsmognad;

    Abstract : This report deals with life-history variation for Eurasian perch (Perca fluviatilis L.), with special emphasis on age and size at maturity in females, in perch populations that have changed in size distribution. The collection of fish samples was made with multimesh gill nets year 2011. READ MORE

  6. 20. Life-History Divergence and Relative Fitness of Nestling Ficedula Flycatcher Hybrids

    University essay from Zooekologi; Institutionen för biologisk grundutbildning

    Author : Yuki Nonaka; [2012]
    Keywords : flycatcher; hybridization; Speciation; life-history;

    Abstract : The typical intermediate morphology of hybrids may result in their failure to utilize the same niches as their parents. However, the fitness consequences of the potentially intermediate life-history traits of hybrids have been given less scientific attention. READ MORE