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Snoeijs, P
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Publications (10 of 14) Show all publications
Reid, P., Johns, D., Edwards, M., Starr, M., Poulin, M. & Snoeijs, P. (2007). A biological consequence of reducing Arctic ice cover: Arrival of the Pacific diatom Neodenticula seminae in the North Atlantic for the first time in 800000 years. Global Change Biology, 13(9), 1910-1921
Open this publication in new window or tab >>A biological consequence of reducing Arctic ice cover: Arrival of the Pacific diatom Neodenticula seminae in the North Atlantic for the first time in 800000 years
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2007 (English)In: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486, Vol. 13, no 9, p. 1910-1921Article in journal (Refereed) Published
Abstract [en]

The Continuous Plankton Recorder survey has monitored plankton in the Northwest Atlantic at monthly intervals since 1962, with an interegnum between 1978 and 1990. In May 1999, large numbers of the Pacific diatom Neodenticula seminae were found in Continuous Plankton Recorder (CPR) samples in the Labrador Sea as the first record in the North Atlantic for more than 800 000 years. The event coincided with modifications in Arctic hydrography and circulation, increased flows of Pacific water into the Northwest Atlantic and in the previous year the exceptional occurrence of extensive ice-free water to the North of Canada. These observations indicate that N. seminae was carried in a pulse of Pacific water in 1998/early 1999 via the Canadian Arctic Archipelago and/or Fram Strait. The species occurred previously in the North Atlantic during the Pleistocene from∼1.2 to∼0.8 Ma as recorded in deep sea sediment cores. The reappearance of N. seminae in the North Atlantic is an indicator of the scale and speed of changes that are taking place in the Arctic and North Atlantic oceans as a consequence of regional climate warming. Because of the unusual nature of the event it appears that a threshold has been passed, marking a change in the circulation between the North Pacific and North Atlantic Oceans via the Arctic. Trans-Arctic migrations from the Pacific into the Atlantic are likely to occur increasingly over the next 100 years as Arctic ice continues to melt affecting Atlantic biodiversity and the biological pump with consequent feedbacks to the carbon cycle.

Keywords
Arctic, biological pump, continuous plankton recorder, CPR, deep sea cores, Neodenticula seminae, North Atlantic, North Pacific, phytoplankton, Pleistocene, subpolar gyre
National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-14494 (URN)10.1111/j.1365-2486.2007.01413.x (DOI)000249222800007 ()
Available from: 2008-01-30 Created: 2008-01-30 Last updated: 2017-12-11Bibliographically approved
Hopkins, C., Thulin, J., Sutinen, J., Kononen, K. & Snoeijs, P. (2006). BONUS-169 Baltic Sea Science Plan and Implementation Strategy.
Open this publication in new window or tab >>BONUS-169 Baltic Sea Science Plan and Implementation Strategy
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2006 (English)Report (Other scientific)
Series
BONUS Publication ; 5
Identifiers
urn:nbn:se:uu:diva-10727 (URN)
Available from: 2007-04-22 Created: 2007-04-22
Andersson, M., Schubert, H., Pedersén, M. & Snoeijs, P. (2006). Different patterns of carotenoid composition and photosynthesis acclimation in two tropical red algae. Marine Biology, 14, 653-665
Open this publication in new window or tab >>Different patterns of carotenoid composition and photosynthesis acclimation in two tropical red algae
2006 (English)In: Marine Biology, Vol. 14, p. 653-665Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-24117 (URN)
Available from: 2007-02-03 Created: 2007-02-03 Last updated: 2011-01-11
Ulanova, A. & Snoeijs, P. (2006). Gradient responses of epilithic diatom communities in the Baltic Sea proper. Estuarine, Coastal and Shelf Science, 68, 661-674
Open this publication in new window or tab >>Gradient responses of epilithic diatom communities in the Baltic Sea proper
2006 (English)In: Estuarine, Coastal and Shelf Science, Vol. 68, p. 661-674Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-24191 (URN)
Available from: 2007-02-04 Created: 2007-02-04 Last updated: 2011-01-11
Wänstrand, I. & Snoeijs, P. (2006). Phytoplankton community dynamics assessed by ships-of-opportunity sampling in the northern Baltic Sea: A comparison of HPLC pigment analysis and cell counts. Estuarine Coastal and Shelf Science, 66(1-2), 135-146
Open this publication in new window or tab >>Phytoplankton community dynamics assessed by ships-of-opportunity sampling in the northern Baltic Sea: A comparison of HPLC pigment analysis and cell counts
2006 (English)In: Estuarine Coastal and Shelf Science, Vol. 66, no 1-2, p. 135-146Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-74973 (URN)
Available from: 2006-03-04 Created: 2006-03-04 Last updated: 2011-01-11
Schubert, H., Andersson, M. & Snoeijs, P. (2006). Relationship between photosynthesis and non-photochemical quenching of chlorophyll fluorescence in two red algae with different carotenoid compositions. Marine Biology, 149(5), 1003-1013
Open this publication in new window or tab >>Relationship between photosynthesis and non-photochemical quenching of chlorophyll fluorescence in two red algae with different carotenoid compositions
2006 (English)In: Marine Biology, ISSN 0025-3162, E-ISSN 1432-1793, Vol. 149, no 5, p. 1003-1013Article in journal (Refereed) Published
Abstract [en]

Algae are continuously exposed to short-term fluctuations in irradiance. We investigate how two red algae species regulate photosynthetic efficiency to cope with such changes and identify some strategies that differ from higher plants. Two red algae, Gracilaria domingensis and Kappaphycus alvarezii, with antheraxanthin and lutein as major xanthophylls, respectively, reacted to the onset of low light (below E-k) with a substantial decrease of NPQ. This is different from higher plants, but similar to previous observations in, e.g. cyanobacteria where it indicates an increase in the effective absorbance cross-section of Photosystem II (PSII) by state transition. Kinetic studies in continuous light revealed a high susceptibility of PSII to light stress ((1-q(P))/NPQ) in K. alvarezii immediately after the sudden onset of high light, followed by a decrease. This was caused by a slower onset of NPQ in K. alvarezii, followed by acclimation. In G. domingensis, susceptibility of PSII to light stress was stable with time, but absolute values of (1-q(P))/NPQ were higher than in K. alvarezii. These observations suggest that K. alvarezii may be better adapted to high light levels, but is less well prepared for large sudden changes in irradiation. In K. alvarezii, photosynthesis continued to increase with increasing irradiation when NPQ was saturated. As (1-q(P)) and NPQ were still balanced in this situation, most likely, processes other than photosynthetic oxygen release are responsible for the increasing net O-2 production observed.

National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-24185 (URN)10.1007/s00227-006-0265-9 (DOI)000239322200002 ()
Available from: 2007-02-04 Created: 2007-02-04 Last updated: 2017-12-07Bibliographically approved
Choo, K., Nilsson, J., Pedersén, M. & Snoeijs, P. (2005). Photosynthesis, carbon uptake and antioxidant defence in two coexisting filamentous green algae under different stress conditions. Marin Ecology Progress Series, 292, 127-138
Open this publication in new window or tab >>Photosynthesis, carbon uptake and antioxidant defence in two coexisting filamentous green algae under different stress conditions
2005 (English)In: Marin Ecology Progress Series, Vol. 292, p. 127-138Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-76549 (URN)
Available from: 2006-03-04 Created: 2006-03-04 Last updated: 2011-01-11
Klenell, M., Snoeijs, P. & Pedersén, M. (2004). Active carbon uptake in Laminaria digitata and Laminaria saccharina driven by a proton pump in the plasma membrane. Hydrobiologia, 514, 41-53
Open this publication in new window or tab >>Active carbon uptake in Laminaria digitata and Laminaria saccharina driven by a proton pump in the plasma membrane
2004 (English)In: Hydrobiologia, Vol. 514, p. 41-53Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-79294 (URN)
Available from: 2006-04-06 Created: 2006-04-06 Last updated: 2011-01-12
van Nieuwerburgh, L., Wänstrand, I. & Snoeijs, P. (2004). Growth and C:N:P ratios in copepods grazing on N- or Si-limited phytoplankton bloom. Hydrobiologia, 514, 57-72
Open this publication in new window or tab >>Growth and C:N:P ratios in copepods grazing on N- or Si-limited phytoplankton bloom
2004 (English)In: Hydrobiologia, Vol. 514, p. 57-72Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-70491 (URN)
Available from: 2006-04-06 Created: 2006-04-06 Last updated: 2011-01-12
Choo, K., Snoeijs, P. & Pedersén, M. (2004). Oxidative stress tolerance in the filamentous green algae Cladophora glomerata and Enteromorpha ahlneriana. Journal of Experimental Marine Biology and Ecology, 298, 111-123
Open this publication in new window or tab >>Oxidative stress tolerance in the filamentous green algae Cladophora glomerata and Enteromorpha ahlneriana
2004 (English)In: Journal of Experimental Marine Biology and Ecology, Vol. 298, p. 111-123Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-70474 (URN)
Available from: 2005-04-24 Created: 2005-04-24 Last updated: 2011-01-12
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