Sökning: "Aquatic ecology"

Visar resultat 11 - 15 av 47 uppsatser innehållade orden Aquatic ecology.

  1. 11. How does hydropeaking and geological substrate affect aquatic macroinvertebrates in a regulated river?

    Master-uppsats, Karlstads universitet/Institutionen för miljö- och livsvetenskaper (from 2013)

    Författare :Andreas Vernby; [2021]
    Nyckelord :Hydropeaking; geological substrate; aquatic macroinvertebrates; EPT species; Hester-Dendy samplers; Korttidsreglering; geologiskt substrat; akvatiska makroevertebrater; EPT; Hester-Dendy-provtagare;

    Sammanfattning : Hydropower is an important source of renewable energy, but is often a cause of degradation to river ecosystems. Hydropeaking, i.e. the frequent alteration of discharge, is a process involved in hydropower generation and has been proven to affect aquatic organisms negatively. LÄS MER

  3. 12. Sammansättning av funktionella födosöksgrupper hos akvatiska insekter i vattendrag med och utan korttidsreglering

    Kandidat-uppsats, Karlstads universitet/Fakulteten för hälsa, natur- och teknikvetenskap (from 2013)

    Författare :Pontus Hindrikes Bergström; [2021]
    Nyckelord :Functional feeding groups; Aquatic invertebrates; FFG; Shredders; Grazers; Gatherers; Filter feeders; Predators; Hydropeaking; EPT; Funktionella födosöksgrupper; Korttidsreglering; akvatiska insekter; FFG; EPT;

    Sammanfattning : Hydropeaking is important to meet peak demand of electricity on the Swedish powergrid. The rapid changes in discharge may affect the ecology of streams and rivers negatively downstream of hydropeaking powerplants. LÄS MER

  4. 13. The evaluation of preparation techniques for the measurements of hydrogen isotope ratios in ecology

    Master-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Kusal Weragama; [2021]
    Nyckelord :Deuterium; liquid water equilibration; steam equilibration; exchangeable H fraction; non-exchangeable H; Equilibrium fractionation factor; Isotopic soil fraction;

    Sammanfattning : The stable isotope ratio of non-exchangeable hydrogen (δ2Hn) emerged as a promising new tool for source attribution in aquatic ecology, which can better discriminate between the organic matter sources. However, determining the absolute isotopic values is problematic due to the functional groups with hydrogen (H) that can easily exchange with the ambient water. LÄS MER

  5. 14. Behaviour and morphology in wild guppies from populations with high and low predation pressure in Trinidad

    Master-uppsats, SLU/Dept. Of Aquatic Resources

    Författare :William Harry Ashworth; [2020]
    Nyckelord :behavioural ecology; colouration; Poecilia reticulata; sexual ornament;

    Sammanfattning : Behaviour and morphology can vary significantly within a species as a result of the predation pressure individuals are exposed to. Wild populations of guppies (Poecilia reticulata) exposed to high and low predation can be found in the streams of northern Trinidad, providing a useful study system for investigating how behaviour and morphology are affected by predation. LÄS MER

  7. 15. Putting behavioral assays on fish to the test: Are sociality and scototaxis trials relevant in the wild?

    Master-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Arno Veenstra; [2020]
    Nyckelord :Acoustic telemetry; Social network; Sociality; Scototaxis; Migration;

    Sammanfattning : Animal behavior has become a frequently used tool in modern ecology and ecotoxicology, where laboratory behavioral traits are recognized as sensitive endpoints for assessing natural behavior or non-lethal effects of pollutants on animals. Within these research fields, behavioral traits measured in laboratory environments have been used to formulate predictions of ecological consequences that accompany specific behavior. LÄS MER