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  • INTER-RESEARCH  (3)
  • SPRINGER  (3)
  • Hellenic Centre for Marine Research  (2)
  • Berlin, Heidelberg : Springer  (1)
  • Biodiversity Journal  (1)
  • 2020-2022  (1)
  • 2015-2019  (9)
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  • 2020-2022  (1)
  • 2015-2019  (9)
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  • 1
    Online-Ressource
    Online-Ressource
    Faszination Meeresforschung : Ein ökologisches Lesebuch (2017)
    Berlin, Heidelberg : Springer
    Details Verfügbarkeit
    Schlagwort(e): Life sciences ; Aquatic ecology ; Nature ; Environment ; Marine sciences ; Freshwater ; Life Sciences ; Oceanography. ; Ecology . ; Life sciences ; Aquatic ecology ; Nature ; Environment ; Marine sciences ; Freshwater ; Meereskunde ; Meeresbiologie ; Meeresökologie ; Aufsatzsammlung ; Meereskunde ; Meeresbiologie ; Meeresökologie
    Beschreibung / Inhaltsverzeichnis: Prolog -- 1 Die physikalische Umwelt „Meer“ -- 2 Der marine Kohlenstoffkreislauf -- 3 Das Pelagial -- 4 Eine virtuelle Reise durch den Atlantik – Energieflüsse, Nahrungswege und Anpassungspfade -- 5 Das Leben im Eispalast: Flora und Fauna des arktischen Meereises -- 6. Wechselwirkungen zwischen Meeresboden und Ozean: Die pelago-benthische Kopplung im Südpolarmeer -- 7 Auftriebsgebiete und El Niño -- 8 Das Bakterioplankton – Riese und Regulator im marinen Stoffumsatz -- 9 Das Phytoplankton im Überblick -- 10 Die wichtigsten Gruppen des Zooplanktons -- 11 Krill und Salpen prägen das antarktische Ökosystem -- 12 Mikroplastikmüll im Meer -- 13 Tintenfische – die Spitzenathleten der Weltmeere,- 14 Meeresschildkröten haben es schwer -- 15 Fischbrut im Nahrungsnetz -- 16 Der arktische Polardorsch und der Antarktische Silberfisch: Erfolgsgeschichten im Eismeer -- 17 Seevögel und ihre Ernährungsweisen als Spiegel der Meeresumwelt -- 18. Schweinswale in der Ostsee – Forschung für den Artenschutz -- 19 Leben am Meeresboden -- 20 Mikroorganismen des Tiefseebodens: Vielfalt, Verteilung, Funktion -- 21 Stabilität, Störungen oder Zufall: Was steuert marine Biodiversität? -- 22 Dunkle Energie: Symbiosen zwischen Tieren und chemosynthetischen Bakterien -- 23 Meeresküsten – ein Überblick -- 24 Leben auf festem Grund – Hartbodengemeinschaften -- 25 Muschelbänke, Seegraswiesen und Watten an Sand- und Schlickküsten -- 26 Mikroalgen in der Grenzschicht zwischen Sediment und Wasser -- 27 Wälder unter Wasser – Großalgengemeinschaften -- 28 Mangroven – Wälder zwischen Land und Meer -- 29 Ökosystem Korallenriff – Schatzkammer der Meere -- 30 Die Ostsee -- 31. Belastungen unserer Meere durch den Menschen -- 32 Wie wirkt der Klimawandel auf das Leben im Meer? -- 33 Ozeanversauerung: Gewinner und Verlierer im Plankton -- 34 CO2-Wirkung auf Meerestiere -- 35 Helgoland, Krill und Klimawandel -- 36 Klimaflüchtlinge, Migranten und Invasoren -- 37 Die Weltfischerei – mit weniger Aufwand fängt man mehr -- 38 Nachhaltiges Fischereimanagement – kann es das geben? -- 39 Zum Beispiel Kabeljau und Hering: Fischerei, Überfischung und Fischereimanagement im Nordatlantik -- 40 Der tote Leviathan – ein Streifzug durch die Geschichte des antarktischen Walfangs -- 41 Sushi und die Algenfarmen -- 42 Kultur von Meerestieren– mehr Eiweißnahrung aus dem Meer -- 43 Über Forschungsschiffe -- 44 Der Hausgarten in der Framstraße: Von der Momentaufnahme zur Langzeituntersuchung -- 45 Neue Methoden der Artbestimmung -- 46 Zeitmaschine DNA – die verschlüsselte Evolutionsgeschichte im Erbgut -- 47 Computermodelle als Werkzeuge der Meeresökologen -- 48 Meeresbiologische Forschungsinstitute in Deutschland -- Epilog.
    Materialart: Online-Ressource
    Seiten: Online-Ressource (XXII, 573 S. 220 Abb. in Farbe, online resource)
    Ausgabe: 2. Aufl. 2017
    ISBN: 9783662497142
    Serie: SpringerLink
    URL: https://doi.org/10.1007/978-3-662-49714-2
    URL: http://dx.doi.org/10.1007/978-3-662-49714-2
    URL: https://swbplus.bsz-bw.de/bsz1655405721cov.jpg
    URL: https://www.springer.com/de/book/9783662497135
    URL: https://external.dandelon.com/download/attachments/dandelon/ids/CH0022B3F9DA44A0EBDFBC12581A1004A8295.pdf
    DOI: 10.1007/978-3-662-49714-2
    RVK:
    WI 4410
    RVK:
    AR 22170
    Sprache: Deutsch
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  • 2
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    Invasive versus native brachyuran crabs in a European rocky intertidal: respiratory performance and energy expenditures (2018)
    SPRINGER
    In:  EPIC3Marine Biology, SPRINGER, 165(54), pp. 1-14, ISSN: 0025-3162
    Details
    Publikationsdatum: 2018-02-27
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
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  • 3
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    Seasonal lipid dynamics of the shrimps Crangon crangon and Pandalus montagui in the German Bight (North Sea) (2019)
    INTER-RESEARCH
    In:  EPIC3Marine Ecology-Progress Series, INTER-RESEARCH, 625, pp. 41-52, ISSN: 0171-8630
    Details
    Publikationsdatum: 2019-10-09
    Beschreibung: Environmental fluctuations can impose energetic constraints on organisms in terms of food shortage or compensation for metabolic stress. To better understand the biochemical strategies that support adaptive physiological processes in variable environments, we studied the lipid dynamics of the brown shrimp Crangon crangon and the pink shrimp Pandalus montagui by analysing their midgut glands during an annual cycle. Both species have an overlapping distribu- tion range in the southern North Sea, but differ in their habitat preferences, reproductive strate- gies, and life-history traits. C. crangon showed minor total lipid accumulation in their midgut glands, ranging between 14 and 17% of dry mass (DM), dominated by phospholipids. In contrast, P. montagui stored significantly larger amounts of total lipid (47−70% DM, mainly triacylglycer- ols) and showed a distinct seasonal cycle in lipid accumulation with a maximum in summer. Fatty acid trophic markers indicated a wide food spectrum for both species, with higher preferences of P. montagui for microalgae. In C. crangon, feeding preferences were less distinct due the low total lipid levels in the midgut gland. PCA based on fatty acid compositions of both species suggested that C. crangon has a broader dietary spectrum than P. montagui. C. crangon seems to have the capacity to use sufficient energy directly from ingested food to fuel all metabolic requirements, including multiple spawnings, without building up large lipid reserves in the midgut gland. P. montagui, in contrast, relies more on the energy storage function of the midgut gland to over- come food scarcity and to allocate lipids for reproduction.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev , info:eu-repo/semantics/article
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  • 4
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    Shell disease does not affect biochemical profiles of the North Sea brown shrimp Crangon crangon (2020)
    INTER-RESEARCH
    In:  EPIC3Diseases of Aquatic Organisms, INTER-RESEARCH, 141, ISSN: 0177-5103
    Details
    Publikationsdatum: 2020-11-12
    Beschreibung: The brown shrimp Crangon crangon is a key component of the North Atlantic coastal food web and an important target species for the fishery economy. As the brown shrimp contains large amounts of protein and essential fatty acids, its consumption makes it a beneficial choice for humans. Commercially harvested crustaceans like C. crangon are frequently affected by bacterial shell disease, with necrotizing erosions and ulcerations of the cuticle. To determine whether shell disease influences the nutritional value of C. crangon, total protein and lipid contents, as well as fatty acid compositions of muscle tissue and hepatopancreas, together with the hepatosomatic index, were examined in healthy and affected individuals. The biochemical composition of the tissues did not differ significantly between the 2 groups. Also, the hepatosomatic index, as an indicator of energy reserves in shrimps, was similar between healthy and affected animals. Our results indicate that the nutritional value of C. crangon is not affected by shell disease, as long as it remains superficial as in the present study.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
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  • 5
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    The fat and the lean: Energy storage and food preferences of egg-carrying females of Hemigrapsus sanguineus and Carcinus maenas (2016)
    Hellenic Centre for Marine Research
    In:  EPIC351st European Marine Biology Symposium, Rhodes, Greece, 2016-09-26-2016-09-30Rhodes, Greece, Hellenic Centre for Marine Research
    Details
    Publikationsdatum: 2016-11-18
    Beschreibung: The Asian shore crab H. sanguineus first appeared at the French coast in the late 1990’s. It rapidly extended its range further north to the German Wadden Sea and recently to western Sweden. In the intertidal area, it co-occurs with the European green crab C. maenas. As the ecophysiology of H. sanguineus is virtually unknown, the physiological capacities of both species and their potential for intra-guild competition were investigated. The aim of this study was to specifically compare the energy deposition and dietary preferences of ovigerous females of both species. Females of H. sanguineus and C. maenas carrying immature or mature eggs were collected in April, June, August and October 2015 in an intertidal area of the Island of Helgoland, North Sea. Total lipid levels and fatty acid compositions were determined of both midgut glands and eggs. In H. sanguineus, total lipid levels of the midgut glands were clearly higher than those of C. maenas (40% vs. 10% dry mass, DM). Immature eggs were quite lipid-rich in both species with 30% and 25%DM, respectively, whereas in mature eggs, lipid levels decreased to ~15%DM each. A Principal Component Analysis of the fatty acid compositions of midgut glands and eggs revealed separate clusters for both species with C. maenas lipids more characterized by membrane fatty acids. In C. maenas fatty acids of midgut glands and eggs clustered together largely dominated by carnivory biomarkers. Fatty acids of midgut glands and all eggs of H. sanguineus formed separate clusters and trophic markers indicate a more herbivorous diet. Higher lipid levels and thus more pronounced energy deposition in H. sanguineus midgut glands indicate higher starvation tolerance for females, a potential competitive advantage over C. maenas. Direct food competition, however, seems negligible, as H. sanguineus prefers a more herbivorous diet than C. maenas. Deviating fatty acid compositions in H. sanguineus midgut glands and eggs suggest that this species may represent an income breeder, utilizing energy from both the midgut gland but also from dietary input. Most brachyuran crabs are capital breeders, which rely exclusively on internal reserves.
    Repository-Name: EPIC Alfred Wegener Institut
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  • 6
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    Energetic demand of the invasive crab Hemigrapsus sanguineus and the native Carcinus maenas at Helgoland, North Sea (2016)
    Hellenic Centre for Marine Research
    In:  EPIC351st European Marine Biology Symposium, Rhodes, Greece, 2016-09-26-2016-09-30Rhodes, Greece, Hellenic Centre for Marine Research
    Details
    Publikationsdatum: 2016-11-18
    Beschreibung: Biological invasions can entail major threats to marine biodiversity. Non-indigenous species may induce changes in community structure and ecosystem functioning, thereby affecting ecosystem services and human economic interest and health. Decapod brachyuran crabs are among the most invasive marine animal taxa. The originally European species Carcinus maenas and the Asian shore crab Hemigrapsus sanguineus invaded different coastal areas around the world. While their invasion history and ecology has been thoroughly investigated, physiological properties of H. sanguineus are virtually unknown. The aim of this study was to compare the metabolic energy demand of both crab species and - based on these data - to assess their potential dietary impact on the ecosystem. Respiration measurements were conducted with a flow-through system covering a temperature range naturally experienced by these crabs (5, 10, 15 and 20 °C). Both species were analyzed on the island of Helgoland in April, June and August 2015. A general linear mixed-effects model (LMM) was applied to test for the effects of species, temperature, biomass and sex on respiration rates. Overall rates increased with temperature but decreased with the mass of the crabs. Respiration rates did not differ significantly between sexes in both species. From the full model, two separated LMMs were created for either species. They allowed establishing species-specific equations for the prediction of respiration rates y (nmol d-1 g-1) for a crab of any given mass xMass (g) at any given ambient temperature xTemp (°C): ln y = 10.39 + (-0.34 * ln xMass) + (0.06 * xTemp) for C. maenas and ln y = 10.42 + (-0.39 * ln xMass) + (0.08 * xTemp) for H. sanguineus. The mass-specific respiration rates of C. maenas and H. sanguineus were quite similar. By applying the diet-dependent respiratory quotient, oxygen uptake may be used to calculate carbon uptake and metabolic energy demand either for single crabs or for entire populations of a given area. On the population level, the metabolic energy demand and thus ecosystem impact of both species depend primarily on their abundance in the field and, less so on their dietary preferences.
    Repository-Name: EPIC Alfred Wegener Institut
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  • 7
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    Habitat modelling of crabeater seals (Lobodon carcinophaga) in the Weddell Sea using the multivariate approach Maxent (2017)
    SPRINGER
    In:  EPIC3Polar Biology, SPRINGER, 40(5), pp. 961-976, ISSN: 0722-4060
    Details
    Publikationsdatum: 2017-07-11
    Beschreibung: The crabeater seal (Lobodon carcinophaga) is the most abundant Antarctic seal and inhabits the circumpolar pack ice zone of the Southern Ocean. Until now, information on important environmental factors affecting its distribution as well as on foraging behaviour is limited. In austral summer 1998, 12 crabeater seals of both sexes and different age classes were equipped with satellite-linked dive recorders at Drescher Inlet (72.85°S, 19.26°E), eastern Weddell Sea. To identify suitable habitat conditions within the Weddell Sea, a maximum entropy (Maxent) modelling approach was implemented. The model revealed that the eastern and southern Weddell Sea is especially suitable for crabeater seals. Distance to the continental shelf break and sea ice concentration were the two most important parameters in modelling species distribution throughout the study period. Model predictions demonstrated that crabeater seals showed a dynamic response to their seasonally changing environment emphasized by the favoured sea ice conditions. Crabeater seals utilized ice-free waters substantially, which is potentially explained by the comparatively low sea ice cover of the Weddell Sea during summer 1998. Diving behaviour was characterized by short (〉90 % = 0–4 min) and shallow (〉90 % = 0–51 m) dives. This pattern reflects the typical summer and autumn foraging behaviour of crabeater seals. Both the distribution and foraging behaviour corresponded well with the life history of the Antarctic krill (Euphausia superba), the preferred prey of crabeater seals. In general, predicted suitable habitat conditions were congruent with probable habitats of krill, which emphasizes the strong dependence on their primary prey.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
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  • 8
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    Seasonal lipid storage and dietary preferences of native European versus invasive Asian shore crabs (2018)
    INTER-RESEARCH
    In:  EPIC3Marine Ecology-Progress Series, INTER-RESEARCH, 602, pp. 169-181, ISSN: 0171-8630
    Details
    Publikationsdatum: 2018-08-24
    Beschreibung: The invasive Asian shore crab Hemigrapsus sanguineus and the native European green crab Carcinus maenas share intertidal habitats along European North Atlantic shores and may compete for food. We evaluated the energy-storing capacities of the 2 species and determined their dietary preferences by means of lipid analysis and fatty acid trophic marker indices. Specimens of both sexes and various sizes were sampled in the rocky intertidal of the island of Helgoland (North Sea) in April, June, August, and October 2015. Total lipids of the midgut glands were significantly higher in H. sanguineus than in C. maenas and followed a distinct seasonal cycle in both sexes (ca. 20−50% of dry mass, DM). The lower lipid contents of C. maenas (ca. 20% of DM) remained at a similar level throughout the seasons. The seasonal differences in the females of H. sanguineus may be due to higher reproductive output and, consequently, lipid turnover, but remain unexplained in males. Trophic indices for Bacillariophyceae, Chlorophyta, and especially Phaeophyceae were higher in H. sanguineus than in C. maenas, suggesting a higher degree of herbivory of the invader. In contrast, the Rhodophyta index was higher in C. maenas. Thus, competition for food between the 2 species will probably be low in habitats rich in macroalgae. The ability of H. sanguineus to utilize mainly energy-poor algae but accumulate high-energy reserves may be an advantage for successfully establishing persistent populations in new habitats.
    Repository-Name: EPIC Alfred Wegener Institut
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  • 9
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    Physiological response of adult Antarctic krill, Euphausia superba, to long-term starvation (2015)
    SPRINGER
    In:  EPIC3Polar Biology, SPRINGER, ISSN: 0722-4060
    Details
    Publikationsdatum: 2015-03-05
    Beschreibung: Adult Euphausia superba survive winter without or with little feeding. It is not exactly known whether the scarcity of food or an internal clock, set by the natural Antarctic light regime, are responsible for non-feeding. Our research questions were therefore the following: (1) How will physiological and biochemical conditions of krill change during long-term starvation at constant light regime? (2) If and how do enzyme activities change during such starvation? (3) What is the influence of food availability versus that of light regime? To answer these questions, adult krill were starved under laboratory conditions for 12 weeks with constant light regime (12:12; dark/light) and the impact on physiological functions was studied. Initial experimental condition of krill resembled the condition of late spring krill in the field with fully active metabolism and low lipid reserves. Metabolic activity and activities of enzymes catabolising lipids decreased after the onset of starvation and remained low throughout, whereas lipid reserves declined and lipid composition changed. Mass and size of krill decreased while the inter-moult period increased. Depletion of storage- and structural metabolites occurred in the order of depot lipids and glycogen reserves after onset of starvation until proteins were almost exclusively used after 6–7 weeks of starvation. Results confirmed various proposed overwintering mechanisms such as metabolic slowdown, slow growth or shrinkage and use of lipid reserves. However, these changes were set in motion by food shortage only, i.e.without the trigger of a changing light regime.
    Repository-Name: EPIC Alfred Wegener Institut
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  • 10
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    Amphipod-pteropod associations in the Antarctic Polar Frontal zone and the Weddell Sea (2017)
    Biodiversity Journal
    In:  EPIC317th International Colloquium on Amphipoda, Trapani, Sicily, Italy, 2017-09Biodiversity Journal
    Details
    Publikationsdatum: 2022-09-29
    Beschreibung: Hyperiid amphipod crustaceans are abundant in Southern Ocean waters from the Polar Frontal Zone to shelf waters where they represent a major prey for fish and seabirds. Hyperiella dilatata has evolved a peculiar anti-predatory behaviour: it abducts chemically-protected, shell-less pteropods from the water column and carries them on their dorsal side, holding it between its pereopods (McClintock & Janssen, 1990). The pteropod Clione antarctica produces de novo a predator-deterrent chemical named pteroenone (Bryan et al., 1995). Tandem pairs of pteropods and amphipods were significantly less predated upon than single individuals of Hyperiella and hence this behaviour is very efficient as protection from visually hunting icefish in the crystal-clear shelf waters around the continent (McClintock & Janssen, 1990), however, in the open ocean this behaviour was so far undocumented. We report this association at four different open-water sites in the Southern Ocean between 45 and 71°S and develop hypotheses on its origin and function. H. dilatata abducted Spongiobranchaea pteropods in the Polar Frontal Zone and Clione further south in the Weddell Sea. Lengths of the abducted pteropods varied greatly; the biggest pteropod carried was around half the host’s size. Molecular barcodes of both host and pteropods were obtained. Finally, we hypothesize against which potential predators this anti-predatory behaviour may have been selected for.
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