Search for dissertations about: "copepods"

Showing result 1 - 5 of 43 swedish dissertations containing the word copepods.

  2. 1. Population modeling using harpacticoid copepods : Bridging the gap between individual-level effects and protection goals of environmental risk assessment

    Author : Elin Lundström Belleza; Magnus Breitholtz; Annemette Palmqvist; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Population modeling; Eco toxicity tests; Environmental risk assessment; Harpacticoid copepods; Applied Environmental Science; tillämpad miljövetenskap;

    Abstract : To protect the environment from contaminants, environmental risk assessment (ERA) evaluates the risk of adverse effects to populations, communities and ecosystems. Environmental management decisions rely on ERAs, which commonly are based on a few endpoints at the individual organism level. READ MORE

  4. 2. Effects of toxin-producing phytoplankton on copepods: feeding, reproduction and implications to the fate of toxins

    Author : Betina Kozlowsky-Suzuki; Biologiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ecology; Ekologi; GSH transferase; oocyte development; fate of toxins; toxin accumulation; toxic phytoplankton; copepods;

    Abstract : Phytoplankton growth and loss rates are governed by several factors and in many cases, when growth control fails, algal blooms are established. Such blooms can be formed by different phytoplankton species and some of them have harmful impacts on marine ecosystems. READ MORE

  5. 3. Pigment and Thiamine Dynamics in Marine Phytoplankton and Copepods

    Author : Ingrid Wänstrand; Pauli Snoeijs; Marianne Pedersén; Helmut Hillebrandt; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biology; phytoplankton composition; pigments; chemotaxonomy; inorganic nutrients; pelagic copepods; grazing; astaxanthin; thiamine; mesocosm experiments; marine food webs; eutrophication; Baltic Sea; Biologi; Biology; Biologi;

    Abstract : Based on a field study and several mesocosm experiments, I evaluated the use of pigments as chemotaxonomical biomarkers for phytoplankton community composition in the Baltic Sea and I examined effects of inorganic nutrients on the dynamics of carotenoids and thiamine (vitamin B1) at the phytoplankton–copepod level in marine pelagic food webs. My results show that HPLC pigment analysis combined with CHEMTAX data processing was an accurate alternative to microscopic analysis of Baltic Sea phytoplankton. READ MORE

  6. 4. Copepods in Skeletonema-dominated food webs : Toxicity and nutritional quality as factors controlling copepod-diatom interactions

    Author : Roswati Md Amin; Ulf Båmstedt; Sigrun Jónasdóttir; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Copepod-diatom interaction; toxicity; nutritional quality; Skeletonema;

    Abstract : My thesis focuses on copepod-diatom interactions, specifically on the effects of food quality and toxicity on copepod feeding, reproductive success and behavior but as a frame, also includes a quantitative evaluation of copepod carbon requirements compared to other trophic plankton groups. My aim was to evaluate the function of copepods in diatom-dominated spring blooms. READ MORE

  7. 5. Zooplankton responses to multiple threats within and across generations

    Author : Yongcui Sha; Enhet akvatisk ekologi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Predation; Ultraviolet radiation; Daphnia; copepods; plasticity; maternal effects; adaptation; diel vertical migration;

    Abstract : In their natural environments, organisms are unlikely to be distributed randomly but instead they are constantly faced with multiple and variable threats. In order to maximise survival, they need to be able to perceive the present threat level and respond accordingly. READ MORE