Effects of grazer immigration and nutrient enrichment on an open algae-grazer system

Article Abstract:

The effects of herbivore immigration rates and nutrient enrichment on the dynamics of grazing insect larvae, benthic microalgae, and filamentous macroalgae recovering from low local densities in an open stream are studied. It hypothesized that macroalgae should benefit more strongly than microalgae from increasing nutrient levels and decreasing grazer immigration rates, because both conditions increase macroalgal chances to grow in to a size refuge from herbivory.

Biomass, Phytophagous insects, Plant-animal interactions

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Effects of enrichment on protist abundances and bacterial composition in simple microbial communities

Article Abstract:

The effects of nutrient enrichment and tropic structure in a microbial food web consisting of mixed bacteria, two bacterviorous ciliates and an omnivorous ciliate feeding on both trophic levels are experimentally investigated. All possible food webs including one or more of the ciliate species and cross-classified them with four levels of enrichment of the bacterial medium are assembled.

Drugs, In-Vitro Diagnostic Substance Manufacturing, Bacterial Culture Products, Bacteriology, Bacterial cultures, Microbial ecology

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Food web complexity affects stiochiometric and rophic interactions

Article Abstract:

The complexity of trophic interactions is manipulated by using simple laboratory food webs and complex field food webs in enclosures in Lake Erken. It is concluded that the higher food web complexity through the presence of pelagic primary producers influences the direction and strength of trophic and stoichiometric interactions.

Zooplankton, Invertebrates, Stoichiometry

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