Sökning: "Aquatic food web"

Visar resultat 1 - 5 av 22 uppsatser innehållade orden Aquatic food web.

  1. 1. The effects of fishing on stability of a food web under climate warming

    Master-uppsats, SLU/Dept. Of Aquatic Resources

    Författare :Gabriel Nordström; [2023]
    Nyckelord :fishing; climate change; temperature; predator; consumer; resource; stage-specific; food webs; ontogenetic assymetry; biomass overcompensation; emergent Allee effects; limit cycles;

    Sammanfattning : Predicting the effects of fishing in a warmer environment caused by climate change requires knowledge of what trophic level is fished on, the physiological effects of temperature on fish, and how these two affect ecological interactions. Both temperature and fishing are known to affect the stability of food webs in several ways. LÄS MER

  3. 2. Change in uptake and transfer of zinc in the food chain when predatory fish disappear from the system

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Sara Westerström; [2023]
    Nyckelord :Aquatic food web; Food chain structure; Trophic transfer; Decline of top predators; Stage-structured biomass model; Pollutants; Heavy metals; Zinc; Akvatisk födoväv; Födovävsstruktur; Trofisk överföring; Minskning av toppredatorer; Stegstrukturerad biomassamodell; Föroreningar; Tungmetaller; Zink;

    Sammanfattning : There is a widespread distribution of possibly toxic heavy metals, such as zinc, in aquatic ecosystems. Simultaneously aquatic food webs are changing due to declining predatory fish stocks. LÄS MER

  4. 3. Newly inundated forest landscapes - hotspots for mercury in water and benthic fauna

    Master-uppsats, SLU/Dept. of Aquatic Sciences and Assessment

    Författare :Kirstine Evald Andersson; [2023]
    Nyckelord :Wetland restoration; Inundation; Mercury cycling; Beaver impoundments; Aquatic biogeochemis-try;

    Sammanfattning : Mercury (Hg) is a widespread contaminant in high-latitude aquatic ecosystems, where it can undergo microbial transfor-mation into toxic methylmercury (MeHg). Due to its chemical properties, MeHg tends to accumulate in the aquatic food chain and will eventually end up in predatory species at the top of the terrestrial food web. LÄS MER

  5. 4. Microplastics in food webs- occurrence in Lake Vänern brown trout (Salmo trutta) and its main prey

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

    Författare :Hanna Nordström; [2023]
    Nyckelord :microplastic; freshwater; fish; brown trout; mikroplast; sötvatten; fisk; öring;

    Sammanfattning : Over the past decade, research on microplastic pollution has gained significant attention. Research regarding microplastic occurrence in freshwater fish, however is still scarce. While possible pathways have been investigated, passive transfer via ingestion of prey, and possible bioaccumulation in different organs remains relatively unstudied. LÄS MER

  7. 5. P-cycling in sub-Arctic lakes – the importance of sediment release and retention

    Magister-uppsats, SLU/Dept. of Aquatic Sciences and Assessment

    Författare :Hanna Ravry; [2022]
    Nyckelord :phosphorus; sediment; oligotrophication;

    Sammanfattning : Oligotrophication is generally caused by a decreased nutrient availability, usually due to phosphorous limitation. This is a phenomenon impacting the entire food web and at worst causing cascading alterations within an ecosystem. Lakes of the Northern Hemisphere have lately been documented to be subjected to oligotrophication (e.g. LÄS MER