Essays about: "food-web"

Showing result 1 - 5 of 50 essays containing the word food-web.

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

    University essay from SLU/Dept. Of Aquatic Resources

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

    Abstract : 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. READ MORE

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

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Sara Westerström; [2023]
    Keywords : 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;

    Abstract : 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. READ MORE

  4. 3. Constructing a food web from inventory data in a boreal forest-dominated national park in south-eastern Sweden

    University essay from Linköpings universitet/Institutionen för fysik, kemi och biologi

    Author : Philip Kjellström; [2023]
    Keywords : ecological network; food web; boreal forest food web; national park food web; interspecific competition; swedish forest; construction food web;

    Abstract : A food web was constructed for a boreal-forest dominated national park in south-eastern Sweden, called Tyresta national park and its surrounding nature reserve. Due to increasing threats to mammalian species and their critical role in the food web mammals were used as the outset of the food web, and from there branching out to taxa trophically interacting with mammals directly and indirectly. READ MORE

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

    University essay from SLU/Dept. of Aquatic Sciences and Assessment

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

    Abstract : 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. READ MORE

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

    University essay from Karlstads universitet/Fakulteten för hälsa, natur- och teknikvetenskap (from 2013)

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

    Abstract : 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. READ MORE