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Effects of temperature and heavy metal pollution on Fucus serratus

Effects of temperature and heavy metal pollution on Fucus serratus. Søren Laurentius Nielsen Hanne Dalsgaard Nielsen Roskilde University. Why bother?. Why bother?. They can form extensive populations They provide food and shelter for animals and substratum for epiphytic algae

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Effects of temperature and heavy metal pollution on Fucus serratus

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  1. Effects of temperature and heavy metal pollution onFucus serratus Søren Laurentius Nielsen Hanne Dalsgaard Nielsen Roskilde University

  2. Why bother?

  3. Why bother? • They can form extensive populations • They provide food and shelter for animals and substratum for epiphytic algae • We know they are affected by temperature and various forms of pollution

  4. But what about germlings? They may very well be more susceptible to environmental stressors than adult algae HD Nielsen et al., 2003

  5. Questions • How will climate change interact with anthropogenic pollution to affect Fucus? • Is the effect on germlings more pronounced?

  6. Experimental setup • Fourtemperatures: 6, 12, 17 and 22 °C • Copper as a ”model pollutant” • 0, 100 and 1000 nM total copper, corresponding to 0, 42 and 422 nMfree Cu2+ (0, 2.7 ug/l, 27 ug/l) • A 4x3 setup for with germlings as well as Fucusfronds • Cultivation over 7 days (germlings) and 18 days (adults)

  7. Results: Adult Fucus • Growth:

  8. Results: Adult Fucus • Maximum quantum yield, Fv/Fm:

  9. Results: Adult Fucus • Maximum photosynthesis, ETRmax:

  10. Results: Adult Fucus • Non-photosynthetis quenching, NPQ:

  11. Results: Fucus germlings • Survival:

  12. Results: Fucus germlings • Growth:

  13. Results: Fucus germlings • Maximum quantum yield, Fv/Fm:

  14. Results: Fucus germlings • Maximum photosynthesis, ETRmax:

  15. Results: Fucus germlings • Non-photosynthetic quenching, NPQ:

  16. Conclusions: • Adult Fucus: • Only the growth is affected and only by temperature • Photosynthetic parameters not affected, so effect on growth must be due to loss processes and/or effect on cell division

  17. Conclusions: • Fucus germlings: • Effect on survival, growth and photosynthetic parameters • Effect of both temperature and metal • Survival decreases with increasing temperature, synergistic effect of metal • Temperature has positive effect on growth and photosynthesis, counteracted by metal

  18. Conclusions: • Need to include early life stages in assessments of effects of climate change and pollution on fucoid algae • Only including adult algae can lead to overloking effects important for population maintainance and survival

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