A form-function analysis of photon capture for seaweeds

A large material of planktonic and semiplanktonic micro-crustaceans from various type of waters in south and central Sweden was computerized. The more frequent species were listed according to pH-preference and relation to humic content measured as mg Pt/l. Species indicating oligotrophy have their optima just below the neutral point, eurytopic ones around this level, while the eutrophic species Daphnia cucullata and D. magna were closely correlated with higher pH-levels. No really extreme pH-preference was observed. There is no link between trophic indication and the ranking list for humic content. Most planktic species occur at lower humic contents and semiplankters at higher.     

Occurrence of limnic micro-crustaceans in relation to temperature and oxygen

Information on the distribution of 56 micro-crustaceans from different types of waters in south and central Sweden was analyzed to reveal their relationships to temperature and oxygen content. A very wide tolerance range concerning these factors was found for most species.     

On limnic micro-crustaceans and trophic degree

A large material of planktic and semiplanktic microcrustaceans from different types of waters in south and central Sweden was computerized. The more frequent species were ranked according to phosphorus content (tot-P), electrolytic conductivity and content of suspended matter, searching for correlations with the trophic degree. With few exceptions, species indicating oligotrophy are found at lower factor values and those indicating eutrophy at higher values concerning all the abiotic factors considered.