Global ETD Search

1	Ecology of chemical defenses of algae against the herbivorous snail, Littorina littorea, in the New England rocky intertidal community / Geiselman, Joy Ann. January 1980 (has links) Thesis--Massachusetts Institute of Technology/Woods Hole Oceanographic Institution. / "WHOI-80-21." Vita. Includes bibliographical references (p. 187-206).
2	Copper bioaccumulation in blue mussels and periwinkles from marinas Sjökvist, Tomas January 2019 (has links) Copper (Cu) is a heavy metal that is essential for life but toxic at high concentrations. This toxic effect is used on boats to prevent biofouling on boat hulls by painting the hulls with antifouling paint that contain high levels of Cu. The Cu is slowly diffused out in the water and accumulated by animals higher up in the food chain. In order to test the effects of marinas on Cu bioaccumulation in invertebrates, I sampled molluscs at seven marinas and seven shore sites on the Swedish west coast. Two molluscs with different feeding behaviours, one grazer, the periwinkle (Littorina littorea) and one filter feeder, the blue mussel (Mytilus edulis) were used as study organisms. Both species were sampled at each location within 50 m from each other. Body Cu concentration of both species was measured with a Flame Atomic Absorption Spectrometer (FAAS). Cu concentration of periwinkle soft body tissue was generally higher than in mussel soft body tissue. In addition, periwinkle tissue Cu concentration reacted strongly positively to the presence of marinas, whereas mussel tissue Cu concentrations did not. This shows that contamination from marinas affects the grazing periwinkle but not the filter feeding blue mussel. Thus, for biomonitoring purposes, grazers may be more suited as indicator organisms. Littorina littorea Mytilus edulis antifouling paint invertebrates biomonitoring Annan geovetenskap och miljövetenskap
3	Ocean acidification effects on marine organisms : a study of Littorina littorea and Balanus improvisus Domeij Hilliges, Isak, Stendahl, Cecilia January 2011 (has links) The world’s oceans are becoming more acid in a process called ocean acidification. The pH of the ocean have already decreased by 0.1 units from pre-industrial time until today. Scientists predict that by the year of 2100 the pH will decrease by as much as 0.4 units. This is a big potential problem to many marine species, because they have developed in such a stable environment that has not changed for millions of years. It is difficult to predict how they might be affected by such a decrease in pH during a relatively short time period. Several studies have been made on marine species exposed to decreased pH-levels, the results showed changes in their physiology but it is hard to predict how these changes will affect the organism in a long-term scale and if this might change ecosystem dynamics. Our study measured the activity of Littorina littorea and Balanus improvisus when exposed to lower pH, the results of our study showed an increase in activity for the lower pH (pH 6.0-7.5) when compared to the control (~pH8). The area of ocean acidification is a field that requires further studies to fully understand its effects on the marine ecosystems and the species within it. ocean accidification accidification pH sea marine organism marine littorina littorea balanus improvisus periwinkle barnacle CO2 acid ecosystem activity cirral movement calcium carbonate system buffering low pH havsförsurning försurning pH hav marina organismer marin littorina littorea balanus improvisus havstulpan strandsnäcka CO2 surt ekosystem aktivitet cirrala rörelser buffrande lågt pH

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