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  • ELSEVIER SCIENCE BV  (2)
  • Springer Nature  (1)
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  • 1
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    Induction of domoic acid production in the toxic diatom Pseudo-nitzschia seriata by calanoid copepods (2015)
    ELSEVIER SCIENCE BV
    In:  EPIC3Aquatic Toxicology, ELSEVIER SCIENCE BV, 159, pp. 52-61, ISSN: 0166-445X
    Details
    Publication Date: 2019-07-17
    Description: The toxic diatom Pseudo-nitzschia seriata was exposed directly and indirectly (separated by a membrane)to copepods, Calanus hyperboreus and C. finmarchicus, to evaluate the effects of the copepods on domoicacid production and chain formation in P. seriata. The toxicity of P. seriata increased in the presence ofthe copepods. This response was chemically mediated without physical contact between the organismssuggesting that it was induced by potential waterborne cues from the copepods or changes in waterchemistry. Domoic acid production may be related to defense against grazing in P. seriata although it wasnot shown in the present study. To evaluate if the induction of domoic acid production was mediatedby the chemical cues from damaged P. seriata cells, live P. seriata cells were exposed to a P. seriata cellhomogenate, but no effect was observed. Chain formation in P. seriata was affected only when in directcontact with the copepods. This study suggests that the presence of zooplankton may be one of the factorsaffecting the toxicity of Pseudo-nitzschia blooms in the field.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 2
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    Calanus spp. –vectors for the biotoxin, domoic acid, in the Arctic? (2012)
    ELSEVIER SCIENCE BV
    In:  EPIC3Harmful Algae, ELSEVIER SCIENCE BV, 20, pp. 165-174, ISSN: 1568-9883
    Details
    Publication Date: 2019-07-17
    Description: Three Calanus species, Calanus glacialis, Calanus finmarchicus and Calanus hyperboreus, which are the most important zooplankton herbivores in Western Greenland, were fed with unialgal cultures of toxic Pseudo-nitzschia seriata and non-toxic Pseudo-nitzschia delicatissima. All three copepod species grazed on toxic P. seriata and also accumulated domoic acid during the grazing. There were no differences in ingestion rates between toxic and non-toxic Pseudo-nitzschia species in any of the copepods. C. finmarchicus and C. hyperboreus grazed on toxic P. seriata during the first 6 h of the experiment but seemed to stop grazing during the last 6 h of the experiment suggesting that the copepods may have suffered some kind of physiological incapacitation due to ingestion of domoic acid. C. glacialis grazed on toxic P. seriata continuously during the whole experiment, probably due to the lower domoic acid cell quota of P. seriata during the experiment on C. glacialis than on the other two copepod species. The depuration experiment on C. glacialis indicated that the copepods still retained domoic acid after 10 h of depuration in filtered sea water. The results show that the three Calanus species are potential vectors for domoic acid to higher trophic levels in the Arctic.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 3
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    Vertical redistribution of principle water masses on the Northeast Greenland Shelf (2022)
    Springer Nature
    In:  EPIC3Nature Communications, Springer Nature, 13(1), pp. 7660-7660, ISSN: 2041-1723
    Details
    Publication Date: 2024-04-08
    Description: The Northeast Greenland shelf (NEGS) is a recipient of Polar Water (PW) from the Arctic Ocean, Greenland Ice Sheet melt, and Atlantic Water (AW). Here, we compile hydrographical measurements to quantify long-term changes in fjords and coastal waters. We find a profound change in the vertical distribution of water masses, with AW shoaling 〉60 m and PW thinning 〉50 m since early 2000’s. The properties of these waters have also changed. AW is now 1 °C warmer and the salinity of surface waters and PW are 1.8 and 0.68 lower, respectively. The AW changes have substantially weakened stratification south of ~74°N, indicating increased accessibility of heat and potentially nutrients associated with AW. The Atlantification earlier reported for the eastern Fram Strait and Barents Sea region has also propagated to the NEGS. The increased presence of AW, is an important driver for regional change leading to a likely shift in ecosystem structure and function.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
    Location Call Number Limitation Availability
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