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  • 2020-2024  (36,708)
  • 2020-2022
  • 1940-1944  (2)
  • 2023  (36,708)
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  • 1
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    Early human impact on lake cyanobacteria revealed by a Holocene record of sedimentary ancient DNA (2023)
    Springer Nature
    In:  EPIC3Communications Biology, Springer Nature, 6(1), pp. 72-72, ISSN: 2399-3642
    Details
    Publication Date: 2024-06-18
    Description: Sedimentary DNA-based studies revealed the effects of human activity on lake cyanobacteria communities over the last centuries, yet we continue to lack information over longer timescales. Here, we apply high-resolution molecular analyses on sedimentary ancient DNA to reconstruct the history of cyanobacteria throughout the Holocene in a lake in north-eastern Germany. We find a substantial increase in cyanobacteria abundance coinciding with deforestation during the early Bronze Age around 4000 years ago, suggesting increased nutrient supply to the lake by local communities settling on the lakeshore. The next substantial human-driven increase in cyanobacteria abundance occurred only about a century ago due to intensified agricultural fertilisation which caused the dominance of potentially toxic taxa (e.g., Aphanizomenon). Our study provides evidence that humans began to locally impact lake ecology much earlier than previously assumed. Consequently, managing aquatic systems today requires awareness of the legacy of human influence dating back potentially several millennia.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 2
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    Paleometagenomics reveals environmental microbiome response to vegetation changes in northern Siberia over the millennia (2023)
    Wiley
    In:  EPIC3Environmental DNA, Wiley, 5(6), pp. 1252-1264, ISSN: 2637-4943
    Details
    Publication Date: 2024-06-18
    Description: The study of environmental ancient DNA provides us with the unique opportunity to link environmental with ecosystem change over a millennial timescale. Paleorecords such as lake sediments contain genetic pools of past living organisms that are a valuable source of information to reconstruct how ecosystems were and how they changed in response to climate in the past. Here, we report on paleometagenomics of a sedimentary record in northern Siberia covering the past 6700 years. We integrated taxonomic with functional gene analysis, which enabled to shed light not only on community compositions but also on eco-physiological adaptations and ecosystem functioning. We reconstructed the presence of an open boreal forest 6700 years ago that over time was gradually replaced by tundra. This vegetation change had major consequences on the environmental microbiome, primarily enriching bacterial and archaeal ammonia oxidizers (e.g., Nitrospira, Nitrosopumilus, and Ca. Nitrosocosmicus) in the tundra ecosystem. We identified a core microbiome conserved through time and largely consisting of heterotrophic bacteria of the Bacteroidetes phylum (e.g., Mucilaginibacter) harboring numerous functional genes for degradation of plant-biomass and abiotic and biotic stress resistance. Archaea were also a key functional guild, involved in nitrogen and carbon cycling, not only methanogenesis but possibly also degradation of plant material via enzymes such as cellulases and amylases. Overall, the paleo-perspective offered by our study can have a profound impact on modern climate change biology, by helping to explain and predict the ecological interplay among multiple ecosystem levels based on past experiences.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 3
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    Terrestrial vegetation and lake aquatic community diversity under climate change during the mid–late Holocene in the Altai Mountains (2023)
    Elsevier
    In:  EPIC3Palaeogeography Palaeoclimatology Palaeoecology, Elsevier, 623, pp. 111623-111623, ISSN: 0031-0182
    Details
    Publication Date: 2024-06-18
    Description: Using pollen analysis and metabarcoding of plant sedimentary ancient DNA (sedaDNa), we infer the floristic diversity in the vicinity of Lake Balyktukel, Ulagan Plateau, the Altai Mountains, over the last 7 kyr. The SedaDNA method identified 200% more taxa than found by morphological pollen analysis. In particular, it revealed that the dominant tree for the last 7 kyr was Larix rather than Pinus, which was less frequent in the vicinity of Lake Balyktukel. About 7 ka, larch forest mixed with dwarf birch was widespread on the Ulagan Plateau. The period between 5.3 and 3.4 kyr BP was characterized by the maximal spread of larch forest with an understorey cover of Vaccinium vitis-idaea. Pollen-based annual precipitation reconstruction indicates the most humid phase was between 6.95 and 4.3 ka, and generally coincides with maximal phytodiversity. The most bioproductive period of the lake was from 7 to 6 ka. After that, the trophicity of the lake decreased until 4.5 ka. The appearance of Hippuris vulgaris and increase in Ranunculus subgen. Batrachium at about 5.3–5 ka may indicate the extension of shallow-water ecotopes. Between 3.7 and 3.5 ka, the cyanobacterium Anabaena – an indicator of increased organic matter and algal blooms – was widespread. A planktic thermophilic cladoceran Bosmina longirostris appeared after 1.8 ka and colonized the lake, suggesting an increase in lake trophicity. The last 100 years have been characterized by dramatic changes in the cladoceran community reflecting significant warming of climate.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 4
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    Dinoflagellate cyst abundances in the benthic nepheloid layer, sediment trap and surface sediments off Figueira da Foz (NW Portugal, Atlantic Iberian margin) (2023)
    PANGAEA
    Details
    Publication Date: 2024-06-18
    Description: This dataset includes counts, percentages and concentrations of all dinoflagellate cyst taxa identified in the benthic nephloid layer (BNL), cyst rain and surface sediments collected along a land-sea transect off Figueira da Foz (NW Portugal, Atlantic Iberian margin) during the Hydrographic Institute (IH)-HABWAVE cruise (16th-19th September 2019). Sampling of the dinoflagellate cyst community in the BNL, the water column (sediment trap) and the surface sediments (together with studies of spatio-temporal changes in physical properties) were carried out in order to investigate the dinoflagellate cyst distribution and the factors (physical and biological) affecting it. Water samples for cyst analyses were collected by a rosette firing system associated with the CTD, and the cyst rain using a sediment trap situated above the BNL. They were filtered (40-47 l) on board through a 150µm-nylon mesh sieve onto a 10µm-calibrated stainless steel sieve (Retsch). In the laboratory, cysts were concentrated by centrifugation. Full and empty cysts were counted to investigate whether a reservoir of viable cysts existed in the BNL. Surface sediments were sampled with a Smith McIntyre grab and using Plexiglass tubes (3.6 cm internal diameter) that were inserted in the sediment to recover the top 1-cm layer. Cysts from sediments were concentrated by density separation with sodium polytungstate (2.016 g/ml).
    Keywords: Benthic nepheloid layer; Coastal dynamics; Dinoflagellate cysts; NW portuguese margin; Surface sediments
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 5
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    Morphological measurements of coccoliths from surface samples of R/V SONNE cruise SO95 (2023)
    PANGAEA
    Details
    Publication Date: 2024-06-18
    Description: The dataset compiles morphological measurements of coccoliths (Gephyrocapsa spp.) from one sample from the Western Equatorial Pacific. The morphological measurements were applied to evaluate coccolithophore preservation aspects under different dissolution intensities in a laboratory experiment. For the dissolution experiment, we added different amounts of Calgon solution (0, 0.4, 0.8, 2, 4, and 6 ml) in subsamples prepared from one sediment sample (ODP 807A-2H2W57-59 cm). The length, volume, area, and mass were obtained using the C-Calcita software from images taken under a cross-polarized microscope (Zeiss AX10). Thickness and the shape factor ks were calculated. The columns include the sample name, how much Calgon was added into sediment suspension, the number of coccoliths measured per sample, length, mean ks shape factor and standard deviation of mean ks/mean ks.
    Keywords: Calculated after Gerotto et al. (2022); Calculated average/mean values; Coccoliths; Coccoliths, length; Coccoliths, mass; Coccoliths, shape factor; Coccoliths, shape factor, standard deviation; Coccoliths, thickness; Coccoliths, volume; dissolution experiment; Elevation of event; Emiliania huxleyi; Event label; Gephyrocapsa oceanica; Giant box corer; GIK17925-2; GIK17930-1; GIK17931-1; GIK17932-1; GIK17934-1; GIK17936-1; GIK17937-1; GIK17938-1; GIK17939-1; GIK17940-1; GIK17941-1; GIK17943-1; GIK17944-1; GIK17945-1; GIK17946-1; GIK17949-1; GIK17951-1; GIK17955-1; GIK17956-1; GIK17957-1; GIK17958-1; GIK17959-1; GIK17960-1; GIK17961-1; GIK17962-1; GIK17963-2; GIK17964-1; GIK17965-1; GKG; Latitude of event; Longitude of event; Method/Device of event; MONITOR MONSUN; morphological measurements; SO95; Sonne; South China Sea; Surface sediments
    Type: Dataset
    Format: text/tab-separated-values, 196 data points
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  • 6
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    Coccolith dissolution experiment from one sample of ODP Hole 130-807A (2023)
    PANGAEA
    Details
    Publication Date: 2024-06-18
    Description: The dataset compiles morphological measurements of coccoliths (Gephyrocapsa spp. and Emiliania huxleyi, 〉2µm) from surface samples of the South China Sea retrieved along a depth gradient (629 – 3809 m) during the R/V Sonne cruises (SO-95). The morphological attributes (length, volume, thickness, and ks shape factor) from the Noelaerhabdaceae group (Emiliania huxleyi and Gephyrocapsa spp) were applied to evaluate coccolithophore calcification and preservation aspects. The length, volume, area, and mass were obtained using the C-Calcita software from images taken under a cross-polarized microscope (Zeiss AX10). Thickness and the shape factor ks were calculated. The columns include station names, Longitude, Latitude, Depth (m), number of coccoliths measured per sample, mean ks shape factor, thickness, length, volume, mass, and standard deviation of mean ks/mean ks.
    Keywords: 130-807A; Calculated after Gerotto et al. (2022); Calculated average/mean values; Coccoliths; Coccoliths, length; Coccoliths, shape factor; Coccoliths, shape factor, standard deviation; dissolution experiment; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Emiliania huxleyi; Gephyrocapsa oceanica; Joides Resolution; Leg130; morphological measurements; Sample code/label; South China Sea; Surface sediments; Treatment: solution; West equatorial Pacific Ocean
    Type: Dataset
    Format: text/tab-separated-values, 36 data points
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  • 7
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    Dinoflagellate cyst counts in the benthic nepheloid layer, sediment trap and surface sediments off Figueira da Foz (NW Portugal, Atlantic Iberian margin) (2023)
    PANGAEA
    Details
    Publication Date: 2024-06-18
    Keywords: Alexandrium-type; B1; B2; B3; Benthic nepheloid layer; Bottom grab (Smith-McIntyre); cf. Thoracosphaera sp.; Coastal dynamics; Counting, dinoflagellate cysts; CTD/Rosette; CTD-RO; Date/Time of event; Date/Time of event 2; DEPTH, sediment/rock; DEPTH, water; Dinoflagellate cyst; Dinoflagellate cyst, empty; Dinoflagellate cyst, full; Dinoflagellate cyst, total; Dinoflagellate cyst indeterminata, round brown; Dinoflagellate cyst indeterminata, spinny brown; Dinoflagellate cysts; Diplopsalis-type; Dubridinium sp.; Echinidinium granulatum; Echinidinium transparantum; Elevation of event; Event label; F1-02 LOW; F1-02 UP; F1-03; F1-04 LOW; F1-04 UP; F2-0; F2-1; F2-10; F2-11; F2-12; F2-2; F2-3; F2-4; F2-5; F2-6; F2-7; F2-8; F2-9; Gymnodinium catenatum; Gymnodinium microreticulatum; Gymnodinium nolleri; HABWAVE_B1; HABWAVE_B2; HABWAVE_B3; HABWAVE_F1-02_LOW; HABWAVE_F1-02_UP; HABWAVE_F1-03; HABWAVE_F1-04_LOW; HABWAVE_F1-04_UP; HABWAVE_F2-0; HABWAVE_F2-1; HABWAVE_F2-10; HABWAVE_F2-11; HABWAVE_F2-12; HABWAVE_F2-2; HABWAVE_F2-3; HABWAVE_F2-4; HABWAVE_F2-5; HABWAVE_F2-6; HABWAVE_F2-7; HABWAVE_F2-8; HABWAVE_F2-9; HABWAVE_S1; HABWAVE_S2; HABWAVE_ST; HABWAVE_T1-1; HABWAVE_T1-10; HABWAVE_T1-2; HABWAVE_T1-3; HABWAVE_T1-7; HABWAVE_T1-9; HABWAVE_T2-1; HABWAVE_T2-2; HABWAVE_T2-3; HABWAVE_T2-5; HABWAVE_T2-7; HABWAVE_T2-9; Impagidinium aculeatum; Impagidinium sp.; Latitude of event; Lejeunecysta oliva; Lejeunecysta sp.; Lingulodinium polyedra; Longitude of event; NW portuguese margin; off Figueira da Foz, NW Portugal; Peridinoid spp.; Polykrikos kofoidii; Protoceratium reticulatum; Protoperidinium americanum; Protoperidinium conicum; Protoperidinium divaricatum; Protoperidinium shanghaiense; Protoperidinium sp.; Protoperidinium stellatum; Protoperidinium subinerme; S1; S2; Sample code/label; Sample material; Sample method; Scrippsiella cf. trochoidea; SMG; Spiniferites bentori; Spiniferites cf. ramosus; Spiniferites delicatus; Spiniferites membranaceus; Spiniferites mirabilis; Spiniferites sp.; ST; Surface sediments; T1-1; T1-10; T1-2; T1-3; T1-7; T1-9; T2-1; T2-2; T2-3; T2-5; T2-7; T2-9; Trap, sediment; TRAPS; Votadinium calvum; Votadinium rhomboideum; Votadinium spp.
    Type: Dataset
    Format: text/tab-separated-values, 2196 data points
    Location Call Number Expected Availability
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  • 8
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    Dinoflagellate cyst concentrations in the benthic nepheloid layer, off Figueira da Foz (NW Portugal, Atlantic Iberian margin) (2023)
    PANGAEA
    Details
    Publication Date: 2024-06-18
    Keywords: Alexandrium-type; Benthic nepheloid layer; Brigantedinium sp.; cf. Thoracosphaera sp.; Coastal dynamics; Counting, dinoflagellate cysts; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Dinoflagellate cyst, empty; Dinoflagellate cyst, full; Dinoflagellate cyst, total; Dinoflagellate cyst indeterminata, round brown; Dinoflagellate cyst indeterminata, spinny brown; Dinoflagellate cysts; Diplopsalis-type; Dubridinium sp.; Echinidinium granulatum; Echinidinium transparantum; Elevation of event; Event label; F1-02 LOW; F1-02 UP; F1-03; F1-04 LOW; F1-04 UP; F2-0; F2-1; F2-10; F2-11; F2-12; F2-2; F2-3; F2-4; F2-5; F2-6; F2-7; F2-8; F2-9; Gymnodinium catenatum; Gymnodinium microreticulatum; Gymnodinium nolleri; HABWAVE_F1-02_LOW; HABWAVE_F1-02_UP; HABWAVE_F1-03; HABWAVE_F1-04_LOW; HABWAVE_F1-04_UP; HABWAVE_F2-0; HABWAVE_F2-1; HABWAVE_F2-10; HABWAVE_F2-11; HABWAVE_F2-12; HABWAVE_F2-2; HABWAVE_F2-3; HABWAVE_F2-4; HABWAVE_F2-5; HABWAVE_F2-6; HABWAVE_F2-7; HABWAVE_F2-8; HABWAVE_F2-9; HABWAVE_S1; HABWAVE_S2; HABWAVE_T1-1; HABWAVE_T1-10; HABWAVE_T1-2; HABWAVE_T1-3; HABWAVE_T1-7; HABWAVE_T1-9; HABWAVE_T2-1; HABWAVE_T2-2; HABWAVE_T2-3; HABWAVE_T2-5; HABWAVE_T2-7; HABWAVE_T2-9; Impagidinium aculeatum; Impagidinium sp.; Latitude of event; Lejeunecysta oliva; Lejeunecysta sp.; Lingulodinium polyedra; Longitude of event; NW portuguese margin; off Figueira da Foz, NW Portugal; Peridinoid spp.; Polykrikos kofoidii; Protoceratium reticulatum; Protoperidinium americanum; Protoperidinium conicum; Protoperidinium divaricatum; Protoperidinium shanghaiense; Protoperidinium stellatum; Protoperidinium subinerme; S1; S2; Sample code/label; Sample material; Sample method; Scrippsiella cf. trochoidea; Spiniferites bentori; Spiniferites cf. ramosus; Spiniferites delicatus; Spiniferites membranaceus; Spiniferites mirabilis; Spiniferites sp.; Surface sediments; T1-1; T1-10; T1-2; T1-3; T1-7; T1-9; T2-1; T2-2; T2-3; T2-5; T2-7; T2-9; Votadinium calvum; Votadinium rhomboideum; Votadinium spp.
    Type: Dataset
    Format: text/tab-separated-values, 1920 data points
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  • 9
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    Dinoflagellate cyst abundance in the benthic nepheloid layer, sediment trap and surface sediments off Figueira da Foz (NW Portugal, Atlantic Iberian margin) (2023)
    PANGAEA
    Details
    Publication Date: 2024-06-18
    Keywords: Alexandrium-type; B1; B2; B3; Benthic nepheloid layer; Bottom grab (Smith-McIntyre); Brigantedinium sp.; cf. Thoracosphaera sp.; Coastal dynamics; Counting, dinoflagellate cysts; CTD/Rosette; CTD-RO; Date/Time of event; Date/Time of event 2; DEPTH, sediment/rock; DEPTH, water; Dinoflagellate cyst, empty; Dinoflagellate cyst, full; Dinoflagellate cyst indeterminata, round brown; Dinoflagellate cyst indeterminata, spinny brown; Dinoflagellate cysts; Diplopsalis-type; Dubridinium sp.; Echinidinium granulatum; Echinidinium transparantum; Elevation of event; Event label; F1-02 LOW; F1-02 UP; F1-03; F1-04 LOW; F1-04 UP; F2-0; F2-1; F2-10; F2-11; F2-12; F2-2; F2-3; F2-4; F2-5; F2-6; F2-7; F2-8; F2-9; Gymnodinium catenatum; Gymnodinium microreticulatum; Gymnodinium nolleri; HABWAVE_B1; HABWAVE_B2; HABWAVE_B3; HABWAVE_F1-02_LOW; HABWAVE_F1-02_UP; HABWAVE_F1-03; HABWAVE_F1-04_LOW; HABWAVE_F1-04_UP; HABWAVE_F2-0; HABWAVE_F2-1; HABWAVE_F2-10; HABWAVE_F2-11; HABWAVE_F2-12; HABWAVE_F2-2; HABWAVE_F2-3; HABWAVE_F2-4; HABWAVE_F2-5; HABWAVE_F2-6; HABWAVE_F2-7; HABWAVE_F2-8; HABWAVE_F2-9; HABWAVE_S1; HABWAVE_S2; HABWAVE_ST; HABWAVE_T1-1; HABWAVE_T1-10; HABWAVE_T1-2; HABWAVE_T1-3; HABWAVE_T1-7; HABWAVE_T1-9; HABWAVE_T2-1; HABWAVE_T2-2; HABWAVE_T2-3; HABWAVE_T2-5; HABWAVE_T2-7; HABWAVE_T2-9; Impagidinium aculeatum; Impagidinium sp.; Latitude of event; Lejeunecysta oliva; Lejeunecysta sp.; Lingulodinium polyedra; Longitude of event; NW portuguese margin; off Figueira da Foz, NW Portugal; Peridinoid spp.; Polykrikos kofoidii; Protoceratium reticulatum; Protoperidinium americanum; Protoperidinium conicum; Protoperidinium divaricatum; Protoperidinium shanghaiense; Protoperidinium stellatum; Protoperidinium subinerme; S1; S2; Sample code/label; Sample material; Sample method; Scrippsiella cf. trochoidea; SMG; Spiniferites bentori; Spiniferites cf. ramosus; Spiniferites delicatus; Spiniferites membranaceus; Spiniferites mirabilis; Spiniferites sp.; ST; Surface sediments; T1-1; T1-10; T1-2; T1-3; T1-7; T1-9; T2-1; T2-2; T2-3; T2-5; T2-7; T2-9; Trap, sediment; TRAPS; Votadinium calvum; Votadinium rhomboideum; Votadinium spp.
    Type: Dataset
    Format: text/tab-separated-values, 2124 data points
    Location Call Number Expected Availability
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  • 10
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    Dinoflagellate cyst concentrations in surface sediments, off Figueira da Foz (NW Portugal, Atlantic Iberian margin) (2023)
    PANGAEA
    Details
    Publication Date: 2024-06-18
    Keywords: Alexandrium-type; B1; B2; B3; Benthic nepheloid layer; Bottom grab (Smith-McIntyre); Brigantedinium sp.; cf. Thoracosphaera sp.; Coastal dynamics; Counting, dinoflagellate cysts; Date/Time of event; DEPTH, sediment/rock; DEPTH, water; Dinoflagellate cyst, empty; Dinoflagellate cyst, full; Dinoflagellate cyst, total; Dinoflagellate cyst indeterminata, round brown; Dinoflagellate cyst indeterminata, spinny brown; Dinoflagellate cysts; Diplopsalis-type; Dubridinium sp.; Echinidinium granulatum; Echinidinium transparantum; Elevation of event; Event label; Gymnodinium catenatum; Gymnodinium microreticulatum; Gymnodinium nolleri; HABWAVE_B1; HABWAVE_B2; HABWAVE_B3; Impagidinium aculeatum; Impagidinium sp.; Latitude of event; Lejeunecysta oliva; Lejeunecysta sp.; Lingulodinium polyedra; Longitude of event; NW portuguese margin; off Figueira da Foz, NW Portugal; Peridinoid spp.; Polykrikos kofoidii; Protoceratium reticulatum; Protoperidinium americanum; Protoperidinium conicum; Protoperidinium divaricatum; Protoperidinium shanghaiense; Protoperidinium stellatum; Protoperidinium subinerme; Sample code/label; Sample material; Sample method; Scrippsiella cf. trochoidea; SMG; Spiniferites bentori; Spiniferites cf. ramosus; Spiniferites delicatus; Spiniferites membranaceus; Spiniferites mirabilis; Spiniferites sp.; Surface sediments; Votadinium calvum; Votadinium rhomboideum; Votadinium spp.
    Type: Dataset
    Format: text/tab-separated-values, 180 data points
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