Sökning: "Predator"

Visar resultat 16 - 20 av 192 avhandlingar innehållade ordet Predator.

  1. 16. Effects of behavioural flexibility and habitat complexity on predator-prey interactions in fish communities

    Författare :Peter Eklöv; Gary G. Mittelbach; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; predator-prey interactions; behavioural flexibility; habitat complexity; foraging mode; sit-and-wait; group foraging; Perea fluviatilis; Esox lucius; Rutilus rutilus; size-structured interactions; species-specific antipredator behaviour; proximate cues; habitat distribution; temporal patterns;

    Sammanfattning : .... LÄS MER

  3. 17. Plant-seed predator interactions – ecological and evolutionary aspects

    Författare :Hannah Östergård; Johan Ehrlén; Peter Hambäck; William Kunin; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; apparent competition; community context; fruit abortion; defence; host range; monophagous; offence; oligophagous; plant-animal interactions; pre-dispersal seed predation; selection; spatio-temporal variation; Biology; Biologi; Plant Ecology; växtekologi;

    Sammanfattning : Plant-animal interactions are affected by both abundance and distribution of interacting species and the community context in which they occur. However, the relative importance of these factors is poorly known. LÄS MER

  4. 18. The Nepotistic Parent; Predator Protection, Kinship and Philopatry

    Författare :Michael Griesser; Jan Ekman; Ronald Mumme; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; referential alarm calls; delayed dispersal; nepotism; vigilance; alarm calling; mobbing; extended parental care; families; Perisoreus infaustus; Siberian jay; Biologi; Biology; Biologi; populationsbiologi; Population Biology;

    Sammanfattning : Evolution is fuelled by independent reproduction events. Yet, the offspring of at least three percent of all bird species postpone dispersal and forego independent reproduction. LÄS MER

  5. 19. Predator induced phenotypic plasticity in a freshwater snail

    Författare :Thomas Lakowitz; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; dispersal; Radix balthica; shell morphology; reaction norm; multiple predators; cost of plasticity; intraspecific competition; inerspecific competition;

    Sammanfattning : In this thesis I examined a phenotypically plastic defence in a common freshwater snail, Radix balthica. Adaptive prey defences may involve behavioural, life-history or morphological changes. Snails are important species in freshwater systems. LÄS MER

  7. 20. Hidden biodiversity in an alpine freshwater top predator : Existence, characteristics, and temporal dynamics of cryptic, sympatric brown trout populations

    Författare :Anastasia Andersson; Linda Laikre; Nils Ryman; Paulo Prodöhl; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; cryptic sympatry; population genetic structure; sympatric populations; intraspecific biodiversity; genetic monitoring; conservation genetics; trophic polymorphism; genetic connectivity; temporal stability; Salmo trutta; populationsgenetik; Population Genetics;

    Sammanfattning : Intraspecific genetic diversity is imperative to the survival of species in a changing environment, and it plays a vital role in ecosystem function. Since this type of diversity can be difficult to detect it is sometimes referred to as “hidden biodiversity”. LÄS MER