Release of Dissolved Organic Substances in the Course of Phytoplankton Blooms

Uses of Microalgae in Aquaculture

“…Studies of the influence of microalgae on larval absorption of soluble organics via drinking are still preliminary. As microalgae can absorb nutrients heterotrophically or myxotrophically, produce them photosynthetically, and transform and excrete various soluble organic substances (Brockmann et al 1983;Admiral et al 1986), the possibilities for interaction with drinking larvae are multiple, even in the gut. Their role in larval nutrition during this period is probably important.…”

Nutrients and organic compounds in the North Sea (Concentrations, Dynamics and Methods): a review

“…As has been found during FLEX, dissolved organic compounds (carbohydrates and amino acids) are enriched at densiclines, indicating release from particulate material trapped at the boundaries (ITTEKKOT et al 1982;BROCKMANN et al 1983).…”

“…Mesocosm studies revealed that the main part of DOM is rdeased by the phytoplankton during assimilation or cell dMsion (EBERLHN et al 1980(EBERLHN et al , 1983BROCKMANN et al 1983;BROCKMANN 1992), cell lysis, excretion by zooplankton and other animals (urea), released during feeding or dissolved from particles.…”

“…Even the dominating fraction of dissolved organic compounds was only measured a few times together with the other state variables (BUTLER et al 1979;BROCKMANN et al 1983;HVDES & EDMUNDS 1989;BROCKMANN & KATTNER 1997). Budgets are mainly based on elements, considering the different phase distributions, or are based on transfer measurements (production, decomposition, sedimentation, resuspension) which, however, are seldom measured all together.…”

“…At this time a budgeting of nutrient conversion is nearly possible from measurements (WEIcHART 1980;BROCKMANN et al 1983). At this time a budgeting of nutrient conversion is nearly possible from measurements (WEIcHART 1980;BROCKMANN et al 1983).…”