Search for dissertations about: "Seed predation"

Showing result 11 - 15 of 24 swedish dissertations containing the words Seed predation.

  2. 11. Pollination, oviposition and seed predation by flower visiting insects in bladder campions (Silene vulgaris S.L., Caryophyllaceae)

    Author : Mats W. Pettersson; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP;

    Abstract : .... READ MORE

  4. 12. Costs of foraging in a dry tropical environment

    Author : Mary Molokwu; Biologiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; foraging behavior; seasonality; predation risk; granivorous birds; food availability; water; temperature; savannah; dry tropics; energy; secondary compounds; diet selection;

    Abstract : This study evaluates the costs associated with foraging for birds in a savannah woodland area in central Nigeria. Specifically, it looks at the following questions: 1) how does seasonal variability in food and water availability affect the value of resources to birds in dry environments? 2) Does proximity to water affect foraging decisions? What implication will this have in the management of savannah birds? 3) Are tropical birds mostly affected by metabolic or predation costs? 4) What factors affect diet selection in birds and how? 5) How are birds adapted to hot dry environments? I carried out experiments in the field and in an aviary and provided artificial food patches, consisting of feeding trays with seeds mixed in sand or pebbles (in the aviary study). READ MORE

  5. 13. Plant colonization of oak plantations - the interactive effects of local environment and land-use history

    Author : Karin Valtinat; Biologiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Nitrogen mineralization; Phosphorus; Plant ecology; Växtekologi; Soil acidity; Seed sowing; Dispersal limitation; Species diversity; Indicator species analysis; Functional groups; Succession; Understory vegetation; Land-use history; Temperate forest;

    Abstract : In Europe, only small fragments of deciduous woodlands remain intact and species dependent on this ecosystem have declined. In southern Sweden, a shifting trend during the 20th century, with more afforestations on former arable land, resulted in new oak stands. These new stand are either on former arable fields or on continuously forested land. READ MORE

  6. 14. Seed predation in relation to crop size and stand size of hazel Corylus avellana L. and beech Fagus sylvatica L

    Author : Urban Wästljung; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP;

    Abstract : .... READ MORE

  7. 15. Odour guided predation on acorns by small rodents during direct seeding

    Author : Mattias Engman; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : Costs related to planting of seedlings and plant material is a major economic obstacle that may impede successful large-scale forest restoration. One way to reduce this cost is to use direct seeding instead of planting. Nut-bearing trees such as oaks have seeds with large nutrient storage that results in competitive seedlings. READ MORE