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  • 1
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    Maximum ingestion and maximum clearance rate of Calanus helgolandicus determined experimentally (2014)
    PANGAEA
    Details
    Publication Date: 2024-01-26
    Keywords: Biomass as carbon per individual; C_helgolandicus_FEEDEXP-1; English Channel; Ingestion rate of carbon per individual; Taxon/taxa; Treatment: temperature; Uniform resource locator/link to reference; Water sample; WS
    Type: Dataset
    Format: text/tab-separated-values, 30 data points
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    DATA PANGAEA
  • 2
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    Maximum ingestion and maximum clearance rate of Calanus helgolandicus determined experimentally (2014)
    PANGAEA
    Details
    Publication Date: 2024-01-26
    Keywords: Biomass as carbon per individual; C_helgolandicus_FEEDEXP-2; English Channel; Ingestion rate of carbon per individual; Taxon/taxa; Treatment: temperature; Uniform resource locator/link to reference; Water sample; WS
    Type: Dataset
    Format: text/tab-separated-values, 30 data points
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    DATA PANGAEA
  • 3
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    Maximum ingestion and maximum clearance rate of Calanus helgolandicus determined experimentally (2014)
    PANGAEA
    Details
    Publication Date: 2024-01-26
    Keywords: Biomass as carbon per individual; C_helgolandicus_FEEDEXP-3; English Channel; Ingestion rate of carbon per individual; Taxon/taxa; Treatment: temperature; Uniform resource locator/link to reference; Water sample; WS
    Type: Dataset
    Format: text/tab-separated-values, 10 data points
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    DATA PANGAEA
  • 4
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    The global marine particle size distribution dataset obtained with the Underwater Vision Profiler 5 - version 1 (2021)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: Particle size distribution data was collected during multiple cruises globally with several regularly intercalibrated Underwater Vision Profilers, Version 5 (UVP5; Picheral et al 2010). During the respective cruises, the UVP5 was mounted on the CTD-Rosette or as a standalone instrument and deployed in vertical mode. The UVP5 takes pictures of an illuminated watervolume of about 1 Liter every few milliseconds. Imaged items are counted, their size measured and abundance and biovolume of the particles is calculated. For different size bins, this information is summarized in the columns "Particle concentration" and "Particle biovolume". For further details please refer to Kiko et al. (in prep.) "A global marine particle size distribution dataset obtained with the Underwater Vision Profiler 5".
    Keywords: Climate - Biogeochemistry Interactions in the Tropical Ocean; global; in situ imaging; particle distribution; SFB754; UVP5
    Type: Dataset
    Format: application/zip, 5 datasets
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    DATA PANGAEA
  • 5
    Electronic Resource
    Electronic Resource
    Population dynamics model of interacting copepod species coupled with a 1‐D model of phytoplankton dynamics in the Greenland Sea Gyre (1997)
    Springer
    Environmental modeling and assessment 2 (1997), S. 29-36 
    Details
    ISSN: 1573-2967
    Keywords: population dynamics ; copepod interactions ; food webs ; Greenland Sea ; ecosystem model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The population dynamics of two copepods Calanus hyperboreus and Oithona similis are simulated simultaneously in a 1‐D model of phytoplankton and nutrient in the centre of the Greenland Sea Gyre. The copepod model describes the development of cohorts in terms of numbers and biomasses over the year. Effects of competition for food and interactions (predation) between species have been studied. Due to the short period of phytoplankton bloom and the slow growth of large copepods, small but fast growing copepods can play a key role in the ecosystem dynamics: they consume the phytoplankton when the bloom occurs, recycle matter in the upper layer, and serve as preys for larger species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019004919035
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    Paper (German National Licenses)
    Fulltext
  • 6
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    An overview of Calanus helgolandicus ecology in European waters (2005)
    Elsevier
    In:  Progress in Oceanography, 65 . pp. 1-53.
    Details
    Publication Date: 2016-10-05
    Description: We review current knowledge and understanding of the biology and ecology of the calanoid copepod Calanus helgolandicus in European waters, as well as provide a collaborative synthesis of data from 18 laboratories and 26 sampling stations in areas distributed from the northern North Sea to the Aegean and Levantine Seas. This network of zooplankton time-series stations has enabled us to collect and synthesise seasonal and multi-annual data on abundance, body size, fecundity, hatching success and vertical distribution of C. helgolandicus. An aim was to enable comparison with its congener Calanus finmarchicus, which has been studied intensively as a key component of European and north east Atlantic marine ecosystems. C. finmarchicus is known to over-winter at depth, whereas the life-cycle of C. helgolandicus is less well understood. Overwintering populations of C. helgolandicus have been observed off the Atlantic coast between 400 and 800 m, while in the Mediterranean there is evidence of significant deep-water populations at depths as great as 4200 m. The biogeographical distribution of C. helgolandicus in European coastal waters covers a wide range of habitats, from open ocean to coastal environments, and its contribution to mesozooplankton biomass ranges from 6% to 93%. Highest abundances were recorded in the Adriatic and off the west coast of Spain. C. helgolandicus is generally found in 9–20 °C water, with maximum abundances from 13–17 °C. In contrast, C. finmarchicus is found in cooler water between 0 and 15 °C, with peak abundances from 0 to 9 °C. As water has warmed in the North Atlantic over recent decades, the range of C. helgolandicus and its abundance on the fringes of its expanding range have increased. This review will facilitate development of population models of C. helgolandicus. This will not only help answer remaining questions but will improve our ability to forecast future changes, in response to a warming climate, in the abundance and distribution of this important species.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.pocean.2005.02.002
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Long-term ketogenic diet causes glucose intolerance and reduced {beta}- and {alpha}-cell mass but no weight loss in mice (2014)
    The American Physiological Society (APS)
    Details
    Publication Date: 2014-03-02
    Description: High-fat, low-carbohydrate ketogenic diets (KD) are used for weight loss and for treatment of refractory epilepsy. Recently, short-time studies in rodents have shown that, besides their beneficial effect on body weight, KD lead to glucose intolerance and insulin resistance. However, the long-term effects on pancreatic endocrine cells are unknown. In this study we investigate the effects of long-term KD on glucose tolerance and β- and α-cell mass in mice. Despite an initial weight loss, KD did not result in weight loss after 22 wk. Plasma markers associated with dyslipidemia and inflammation (cholesterol, triglycerides, leptin, monocyte chemotactic protein-1, IL-1β, and IL-6) were increased, and KD-fed mice showed signs of hepatic steatosis after 22 wk of diet. Long-term KD resulted in glucose intolerance that was associated with insufficient insulin secretion from β-cells. After 22 wk, insulin-stimulated glucose uptake was reduced. A reduction in β-cell mass was observed in KD-fed mice together with an increased number of smaller islets. Also α-cell mass was markedly decreased, resulting in a lower α- to β-cell ratio. Our data show that long-term KD causes dyslipidemia, a proinflammatory state, signs of hepatic steatosis, glucose intolerance, and a reduction in β- and α-cell mass, but no weight loss. This indicates that long-term high-fat, low-carbohydrate KD lead to features that are also associated with the metabolic syndrome and an increased risk for type 2 diabetes in humans.
    Print ISSN: 0193-1849
    Electronic ISSN: 1522-1555
    Topics: Medicine
    Published by The American Physiological Society (APS)
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  • 8
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    Seasonal variation of stable isotope ratios of size-fractionated zooplankton in the Bay of Marseille (NW Mediterranean Sea) (2014)
    Oxford University Press
    Details
    Publication Date: 2014-01-10
    Description: Stable isotope ratios of six size fractions of zooplankton (80 to 〉2000 µm) were analyzed seasonally in 2009–2010 at the SOMLIT site in the Bay of Marseille. Isotopic ratios generally increased with zooplankton size. The highest 15 N values were observed in the 1000–2000 µm fraction. The largest size class (〉2000 µm), dominated by gelatinous plankton, had lower 15 N values due to the low isotopic signatures of most of these organisms. In the larger size fractions (〉1000 µm), isotopic ratios were measured at the taxon level. Brachyuran, stomatopod, teleost and cephalopod larvae showed the highest 15 N values, and salps and pteropods the lowest ones. Lower values of both 13 C and 15 N were recorded in winter and spring than in summer and autumn for all fractions. Seasonal variations were consistent with the fluctuations of environmental parameters (temperature, nutrients, Chl a concentration) and were related to phytoplankton and seawater particulate organic matter (POM) composition. Stable isotope and flow cytometry analysis of water POM indicated that sewage wastewater particles were mixed with marine phytoplankton at the SOMLIT site and transferred up into the zooplanktonic food web.
    Print ISSN: 0142-7873
    Electronic ISSN: 1464-3774
    Topics: Biology
    Published by Oxford University Press
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  • 9
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    Expression pattern of the CXCL12/CXCR4-CXCR7 trio in Kaposi's sarcoma skin lesions (2016)
    Wiley-Blackwell
    Details
    Publication Date: 2016-05-14
    Description: Background Recent studies have independently implicated the chemokine CXCL12 and its receptors, CXCR4 and CXCR7, in KS pathophysiology. Objectives We investigated whether the CXCL12/CXCR4-CXCR7 protein trio could constitute KS biomarkers. Methods Endothelial and spindle cells positive for CXCL12/CXCR4-CXCR7, HHV-8 latency-associated nuclear antigen (LANA), Ki67 antigen (proliferation), and vascular endothelial growth factor (VEGF) were quantitated in skin lesions from patients with AIDS-KS, with classic-KS, and with angiomas, using immunohistochemistry and quantitative image analysis (16, 21 and 20 skin lesions respectively). Plasma CXCL12 concentrations were measured by ELISA from 20 AIDS-KS, 12 HIV-infected patients without KS and 13 healthy donors samples. Results Cells positive for CXCL12, CXCR4, CXCR7, LANA, Ki67 and VEGF were significantly enriched in AIDS-KS and classic-KS versus angiomas ( P 〈0.0001), and in nodular versus macular/papular KS lesions ( P 〈0.05). CXCL12, CXCR4, and CXCR7 detection correlated with LANA, Ki67, and VEGF detection ( r 〉0.4; P 〈0.05). However, plasma CXCL12 concentrations did not differ between AIDS-KS patients, HIV-infected patients without KS and healthy donors. Conclusions The CXCL12/CXCR4-CXCR7 trio is upregulated in KS and correlates with KS pathophysiology markers detection and the severity of skin lesions. Histologic assessment of the CXCL12 axis could serve as a valuable biomarker for KS diagnosis and progression. This article is protected by copyright. All rights reserved.
    Print ISSN: 0007-0963
    Electronic ISSN: 1365-2133
    Topics: Medicine
    Published by Wiley-Blackwell
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  • 10
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    Patterns of variations in C and N stable isotope ratios in size-fractionated zooplankton in the Gulf of Lion, NW Mediterranean Sea (2014)
    Oxford University Press
    Details
    Publication Date: 2014-09-12
    Description: Stable isotope ratios for six size fractions of zooplankton (80 to 〉2000 μm) were analyzed in the Gulf of Lion in spring 2010 and winter 2011. Environmental and plankton community variables were also recorded. The originality of this study is the use of a Lagrangian transport modeling system to determine the origin of the water masses and the assessment of the proportion of detritus in the plankton samples. The highest 15 N values were observed in the 1000–2000 μm fraction in January and in the 500–1000 μm fraction in May. The largest size class (〉2000 μm), dominated by salps, had lower 15 N values owing to the low isotopic signatures of these organisms. The history of the water masses resulted in two main patterns with different isotopic signatures: the water masses which resided on the shelf and the waters masses carried onto the shelf from off-shelf region by the Northern Current. The 13 C values varied strongly between January and May, mainly owing to changes in hydrographic conditions. The 15 N values, plankton size structure and zooplankton feeding activity varied depending on the season, revealing differences in the seasonal trophic structure of the plankton communities. The trophic structure was characterized in January by a high chlorophyl a (Chl- a ) concentration, a population dominated by small organisms and herbivores, and in May by patchy Chl- a distribution, higher particulate organic matter concentration, a population dominated by large size organisms and an increase in the number of omnivores.
    Print ISSN: 0142-7873
    Electronic ISSN: 1464-3774
    Topics: Biology
    Published by Oxford University Press
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