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  • Other Sources  (184)
  • Articles (OceanRep)  (184)
  • GEOMAR  (146)
  • American Meteorological Society
  • Inter Research
  • Springer Nature
  • 2020-2022  (29)
  • 2015-2019  (155)
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  • Other Sources  (184)
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  • Articles (OceanRep)  (184)
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  • 1
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    Unusual marine unicellular symbiosis with the nitrogen-fixing cyanobacterium UCYN-A (2016)
    Springer Nature
    In:  Nature Microbiology, 2 (16214).
    Details
    Publication Date: 2020-06-24
    Description: Nitrogen fixation — the reduction of dinitrogen (N2) gas to biologically available nitrogen (N) — is an important source of N for terrestrial and aquatic ecosystems. In terrestrial environments, N2-fixing symbioses involve multicellular plants, but in the marine environment these symbioses occur with unicellular planktonic algae. An unusual symbiosis between an uncultivated unicellular cyanobacterium (UCYN-A) and a haptophyte picoplankton alga was recently discovered in oligotrophic oceans. UCYN-A has a highly reduced genome, and exchanges fixed N for fixed carbon with its host. This symbiosis bears some resemblance to symbioses found in freshwater ecosystems. UCYN-A shares many core genes with the 'spheroid bodies' of Epithemia turgida and the endosymbionts of the amoeba Paulinella chromatophora. UCYN-A is widely distributed, and has diversified into a number of sublineages that could be ecotypes. Many questions remain regarding the physical and genetic mechanisms of the association, but UCYN-A is an intriguing model for contemplating the evolution of N2-fixing organelles.
    Type: Article , PeerReviewed
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  • 2
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    High levels of solar radiation offset impacts of ocean acidification on calcifying and non-calcifying strains of Emiliania huxleyi (2017)
    Inter Research
    In:  Marine Ecology Progress Series, 568 . pp. 47-58.
    Details
    Publication Date: 2020-02-06
    Description: Coccolithophores, a globally distributed group of marine phytoplankton, showed diverse responses to ocean acidification (OA) and to combinations of OA with other environmental factors. While their growth can be enhanced and calcification be hindered by OA under constant indoor light, fluctuation of solar radiation with ultraviolet irradiances might offset such effects. In this study, when a calcifying and a non-calcifying strain of Emiliania huxleyi were grown at 2 CO2 concentrations (low CO2 [LC]: 395 µatm; high CO2 [HC]: 1000 µatm) under different levels of incident solar radiation in the presence of ultraviolet radiation (UVR), HC and increased levels of solar radiation acted synergistically to enhance the growth in the calcifying strain but not in the non-calcifying strain. HC enhanced the particulate organic carbon (POC) and nitrogen (PON) productions in both strains, and this effect was more obvious at high levels of solar radiation. While HC decreased calcification at low solar radiation levels, it did not cause a significant effect at high levels of solar radiation, implying that a sufficient supply of light energy can offset the impact of OA on the calcifying strain. Our data suggest that increased light exposure, which is predicted to happen with shoaling of the upper mixing layer due to progressive warming, could counteract the impact of OA on coccolithophores distributed within this layer.
    Type: Article , PeerReviewed
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  • 3
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    Seagrass wasting disease varies with salinity and depth in natural Zostera marina populations (2018)
    Inter Research
    In:  Marine Ecology Progress Series, 587 . pp. 105-115.
    Details
    Publication Date: 2021-02-08
    Description: In the 1930s the wasting disease pathogen Labyrinthula zosterae is believed to have killed 90% of the temperate seagrass Zostera marina in the Atlantic Ocean. Despite the devastating impact of this disease the host–pathogen interaction is still poorly understood, and few field studies have investigated factors correlating with the prevalence and abundance of L. zosterae. This study measures wasting disease in natural populations of Z. marina, showing a strong correlation between the disease and both salinity and water depth. No infection was detected in Z. marina shoots from low salinity (13–25 PSU) meadows, whereas most shoots carried the disease in high salinity (25–29 PSU). Shallow (1 m) living Z. marina shoots were also more infected compared to shoots in deeper (5 m) meadows. In addition, infection and transplantation experiments showed that Z. marina shoots from low salinity meadows with low pathogen pressure were more susceptible to L. zosterae infection. The higher susceptibility could not be explained by lower content of inhibitory defense compounds in the shoots. Instead, extracts from all Z. marina shoots significantly reduced pathogen growth, suggesting that Z. marina contains inhibitory compounds that function as a constitutive defense. Overall, the results show that seagrass wasting disease is common in natural Z. marina populations in the study area and that it increases with salinity and decreases with depth. Our findings also suggest that low salinity areas can act as a refuge against seagrass wasting disease.
    Type: Article , PeerReviewed
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  • 4
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    1. Wochenbericht POS520 (2018)
    GEOMAR
    In:  GEOMAR, Kiel, Germany, 3 pp.
    Details
    Publication Date: 2018-02-26
    Description: Investigating deep water column biodiversity and ecology of the Cape Verde Islands Weekly report 14/2/2018-21/2/2018
    Type: Report , NonPeerReviewed
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  • 5
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    Reef sponges facilitate the transfer of coral-derived organic matter to their associated fauna via the sponge loop (2018)
    Inter Research
    In:  Marine Ecology Progress Series, 589 . pp. 85-96.
    Details
    Publication Date: 2021-02-08
    Description: The high biodiversity of coral reefs results in complex trophic webs where energy and nutrients are transferred between species through a multitude of pathways. Here, we hypothesize that reef sponges convert the dissolved organic matter released by benthic primary producers (e.g. corals) into particulate detritus that is transferred to sponge-associated detritivores via the sponge loop pathway. To test this hypothesis, we conducted stable isotope (13C and15N) tracer experiments to investigate the uptake and transfer of coral-derived organic matter from the sponges Mycale fistulifera and Negombata magnifica to 2 types of detritivores commonly associated with sponges: ophiuroids (Ophiothrix savignyi and Ophiocoma scolopendrina) and polychaetes (Polydorella smurovi). Findings revealed that the organic matter naturally released by the corals was indeed readily assimilated by both sponges and rapidly released again as sponge detritus. This detritus was subsequently consumed by the detritivores, demonstrating transfer of coral-derived organic matter from sponges to their associated fauna and confirming all steps of the sponge loop. Thus, sponges provide a trophic link between corals and higher trophic levels, thereby acting as key players within reef food webs.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
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  • 6
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    Introducing the Ocean Science Centre Mindelo (OSCM) (2017)
    GEOMAR
    In:  [Video]
    Details
    Publication Date: 2019-09-23
    Description: On November 11, 2017, GEOMAR and INDP celebrated the inauguration of the "Ocean Science Centre Mindelo (OSCM)". After 3 years of planning and construction works the building has now been handed over to science. The tropical and subtropical Northeast Atlantic is a very exciting region for climate research, marine biology, oceanography and many other disciplines. For many years, scientists of the GEOMAR Helmholtz Centre for Ocean Research Kiel have been conducting campaigns in the area. A few years ago, these numerous long-term activities resulted in the planning of a laboratory and workshop building in Mindelo on the Islands of Cabo Verde. The longstanding and spirited cooperation with the Cape Verdean Institute for Fisheries Development, the Instituto Nacional de Desenvolvimento das Pescas (INDP), was an additional driver for this enterprise. About two and a half years ago, the partners were able to start the implementation of the project idea. GEOMAR is contributing a total of 2.5 million euros. The construction comprises a building, equipped with two universal labs, a wet lab, workshops for maintenance and repair of scientific equipment, storage rooms and offices as well as seminar rooms.
    Type: Video , NonPeerReviewed
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  • 7
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    Kiel fjord pCO2 datasets between 2012 (July) and 2015 (January) measured using a HydroC® pCO2 sensor (2016)
    GEOMAR
    In:  GEOMAR, 4 pp.
    Details
    Publication Date: 2019-09-23
    Type: Report , NonPeerReviewed
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  • 8
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    FS ALKOR: 500 Expeditionen für Forschung und Ausbildung (2017)
    GEOMAR
    In:  GEOMAR News, 2017 (03). pp. 10-11.
    Details
    Publication Date: 2018-01-18
    Description: Seit mehr als 25 Jahren lernen, arbeiten und leben Meereswissenschaftlerinnen und Meereswissenschaftler auf dem Kieler Forschungsschiff ALKOR. 500 Expeditionen hat das 55 Meter lange Schiff mittlerweile absolviert. Es ist neben der POSEIDON das zweite „mittelgroße“ Forschungsschiff, das am GEOMAR stationiert ist.
    Type: Article , NonPeerReviewed
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  • 9
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    POS502 Cruise Report, RV Poseidon Cruise No. 502 (2016)
    GEOMAR
    In:  GEOMAR, Kiel, 43 pp.
    Details
    Publication Date: 2018-02-13
    Type: Report , NonPeerReviewed
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  • 10
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    Cruise Report R.V. Alkor Cruise No.: AL478 (2016)
    GEOMAR
    In:  Alkor-Berichte, AL478 . GEOMAR, Kiel, Germany, 13 pp.
    Details
    Publication Date: 2021-01-29
    Description: Dates of Cruise: 16.05. – 28.05.2016 Areas of Research: Physical, chemical, biological and fishery oceanography Port Calls: Klaipeda, Lithuania, 21.05. – 23.05.2016
    Type: Report , NonPeerReviewed
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