publications sorted by date

J.C., Schukat A., Auel H., Auch D., Kittu L., Pinedo Arteaga E.L., Correa Acosta J., Hagen W. (2022) Towards a solution of the “Peruvian Puzzle”: Pelagic food-web structure and trophic interactions in the northern Humboldt Current upwelling system off Peru. Frontiers in Marine Science 8: 759603  doi.org/10.3389/fmars.2021.759603

Duncan S., Sell A., Hagen W., Fock H. (2022) Environmental drivers of mesopelagic fish asemblages in the Benguela Upwelling Systems. Mar. Ecol. Prog. Ser. 688: 133-152  doi.org/10.3354/meps14017

Temming A., Boenisch A., Hagen W., Brenneken C., Dänhardt A. (2022) Unexpected high discard mortalities of brown shrimp (Crangon crangon) in the North Sea shrimp fishery. Fisheries Res. 252: 106354  doi.org/10.1016/j.fishres.2022.106354

Saborowski R., Tanara A., Fricke E., Koch M., Hagen W. (2022) On the nutritional quality of remains of the brown shrimp Crangon crangon - Changes in fatty acid composition after boiling. Aquaculture Fish & Fisheries. 2022: 1-9

Kaiser P., Hagen W., Bode-Dalby M., Auel H. (2022) Tolerant but facing increased competition: Arctic zooplankton versus Atlantic invaders in a warming ocean. Front. Mar. Sci. 9: 908638  doi.org/10.3389/fmars.2022.908638

Dias Fernandes de Oliveira L., Bode-Dalby M., Schukat A., Auel H., Hagen W. (2022) Cascading effects of calanoid copepod functional groups on the biological carbon pump in the subtropical South Atlantic. Front. Mar. Sci. 9: 920483  doi.org/10.3389/fmars.2022.920483

Rossel S., Kaiser P., Bode-Dalby M., Renz J., Laakmann S., Auel H., Hagen W., Peters J. (2022): Proteomic finger­printing enables quantitative biodiversity assessments of species and ontogenetic stages in Calanus congeners (Copepoda, Crustacea) from the Arctic Ocean. Molecular Resources Ecology 2022; 00: 1-14 doi.org/10.1111/1755-0998.13714

Karakus O., Voelker C., Iversen M., Hagen W., Hauck J. (2022) The role of zooplankton grazing and nutrient recycling for global ocean biogeochemistry and phytoplankton phenology. Journal of Geophysical Research Biogeosciences 127: e2022JG006798 doi.org/10.1029/2022JG006798

Bode-Dalby M., Würth R., Dias Fernandes de Oliveira L., Lamont T., Verheye H.M., Schukat A., Hagen W., Auel H. (2022)
Small is beautiful: the important role of small copepods in carbon budgets of the southern Benguela upwelling system.
J. Plankton Res. (2022): 1-19. doi.org/10.1093/plankt/fbac061

Schukat A., Hagen W., Dorschner S., Correa Acosta J., Luz Pinedo Arteaga E., Ayón P., Auel H. 2021: Zooplankton ecological traits maximize the trophic transfer efficiency of the Humboldt Current upwelling system. Prog. Oceanogr. 193 (102551)

Stumpp M., Saborowski R., Jungblut S., Liu H.-C., Hagen W. 2021: Dietary preferences of brachyuran crabs from Taiwan for marine or terrestrial food sources: evidence based on fatty acid trophic markers. Frontiers in Zoology 18: 26 (12 pp)

Kaiser P., Hagen W., von Appen W.-J., Niehoff B., Hildebrandt N., Auel H. (2021) Effects of a submesoscale oceanographic filament on zooplankton dynamics in the Arctic marginal ice zone. Frontiers in Marine Science 8: 625395

Karakus O., Völker C., Iversen M., Hagen W., Wolf-Gladrow D., Fach B., Hauck J. (2021) Modelling the impact of macrozooplankton on carbon export production in the Southern Ocean. JGR Oceans 126: e202IJC017315   doi.org/10.3389/fmars.2021.759603

Lewandowska A.M., Jonkers L., Auel H., Freund J.A., Hagen W., Kucera M., Hillebrand H. 2020: Scale dependence of temporal biodiversity change in modern and fossil marine plankton. Global Ecol. Biogeogr. 29: 1008-1019. DOI 10.1111/geb.13078

Graeve M., Boissonot L., Niehoff B., Hagen W., Kattner G. 2020. Assimilation and turnover rates of lipid compounds in dominant Antarctic copepods fed with ¹³C-enriched diatoms. Trans. R. Soc. B 375: 20190647

Martinez-Alarcon D., Hagen W., Held C., Saborowski R. 2020: Molecular aspects of lipid metabolism in the midgut gland of the brown shrimp Crangon crangon. Comp. Biochem. Physiol. Part B 248-249: 110465

Segelken-Voigt A., Hagen W., Gerlach G., Strahl J. 2020: Shell disease does not affect biochemical profiles of the North Sea brown shrimp Crangon crangon. Diseases of Aquatic Organisms 141: 117-126. DOI 10.3354/dao03516

Ekau W., Auel H., Bohata K., Buchholz F., Geist S., Hagen W., Koppelmann R., Martin B., Schukat A., Verheye H.M., Wasmund N., Werner T. 2018: Pelagic key species and mechanisms driving energy flows in the northern Benguela upwelling ecosystem and their feedback into biogeochemical cycles. J. Mar. Systems 188: 49-62

Jungblut S., McCarthy M.L., Boos K., Saborowski R., Hagen W. 2018: Seasonal lipid storage and dietary preferences of native European versus invasive Asian shore crabs. Mar. Ecol. Prog. Ser. 602: 169-181

Kaiser P., Bode M., Cornils A., Hagen W., Arbizu Martinez P., Auel H., Laakmann S. 2018: High-resolution community analysis of deep-sea copepods using MALDI-TOF protein fingerprinting. Deep-Sea Res. I 138: 122-130

Bode M., Koppelmann R., Teuber L., Hagen W., Auel H. 2018: Carbon budgets of mesozooplankton copepod communities in the eastern Atlantic Ocean - regional and vertical patterns between 24°N to 21°S. Global Biogeochemical Cycles 32: 840-857

Hillebrand H., Brey T., Gutt J., Hagen W., Metfies K., Meyer B., Lewandowska A. 2018: Climate change: warming impacts on marine biodiversity. In: Hand­book on Marine Environmental Protection (Salomon M., Markus T., eds.),  1024 pp., 2 volumes, Springer, Heidelberg

Bode M., Hagen W., Cornils A., Kaiser P., Auel H. 2018: Copepod distribution and biodiversity patterns from the surface to the deep sea along a latitudinal transect in the eastern Atlantic Ocean (24°N to 21°S). Prog. Oceanogr. 161: 66-77

Jungblut S., Boos K., McCarthy M.L., Saborowski R., Hagen W. 2018: Invasive versus native brachyuran crabs in a European rocky intertidal: respiratory performance and energy expenditures. Mar. Biol. 165: 54-67

Hagen W., Kattner G. 2017: The role of lipids in the life history of the Antarctic silverfish Pleuragramma antarctica. In: The Antarctic silverfish: a keystone species in a changing ecosystem, p. 131-148. (M. Vacchi, E. Pisano, Ghigliotti, eds.) Advances in Polar Ecology, Springer, Heidelberg, 314 pp.

Jungblut S., Beermann J., Boos K., Saborowski R., Hagen W. 2017: Local development of the invasive crab Hemigrapsus sanguineus (De Haan, 1853) and its potential native competitor Carcinus maenas (Linnaeus, 1758) at Helgoland (North Sea) between 2009 and 2014. Aquatic Invasions 12: 85-96

Bischoff A.A., Kubitz M., Wranik C.M., Pfefferkorn H., Augustin C.B., Hagen W., Palm H.W. 2017: Fatty acid utilization of pikeperch (Sander lucioperca (Linnaeus, 1758)) larvae under starvation conditions during early development. Bull. Fish. Biology 17: 59-73

Koch K., Hagen W., Graeve M., Bischof K. 2017: Does fatty acid composition contribute to differences in high-light tolerance in the intertidal rhodophytes Mastocarpus stellatus and Chondrus crispus? Helgoland Mar. Res. 71: 15 pp.

Nachtsheim D., Jerosch K., Hagen W., Plötz J., Bornemann H. 2017: Habitat modelling of crabeater seals (Lobodon carcinophaga) in the Weddell Sea using the multivariate approach Maxent. Polar Biol. 40: 961-976

Bode M., Laakmann S., Kaiser P., Hagen W., Auel H., Cornils A. 2017: Unraveling diversity of deep-sea copepods using integrated morphological and molecular approaches. J. Plankton Res. 39: 600-617

Hempel G., Bischof K., Hagen W. (Hsgr.) 2017: Faszination Meeresforschung - Ein ökologisches Lesebuch, 95 Autoren, 577 S., 2. Auflage, Springer, Heidelberg, N.Y.

Auel H., Hagen W. 2017: Eine virtuelle Reise durch die Weltmeere - über Energie­flüsse, Nahrungswege und Anpassungspfade. S. 41-50. In: Faszination Meeresforschung - Ein ökologisches Lesebuch (G. Hempel, K. Bischof, W. Hagen, Hsgr.), 577 S., 2. Auflage, Springer, Heidelberg, N.Y.

Boissonot L., Niehoff B., Hagen W., Søreide J., Graeve M. 2016: The role of small-sized copepods in the lipid-driven Arctic marine food web. J. Plankton Res. 38: 1420-1432

Bode M., Hagen W., Schukat A., Teuber L., Fonseca-Batista D., Dehairs F., Auel H. 2016: Feeding strategies of tropical and subtropical calanoid copepods throughout the eastern Atlantic Ocean - Latitudinal and bathymetric aspects. Prog. Oceanogr. 138: 268-282

Koch K., Thiel M., Hagen W., Graeve M., Gómez I., Jofre D., Hofmann L.C., Tala F., Bischof K. 2016: Short- and long-term acclimation patterns of the giant kelp Macrocystis porifera (Laminariales; Phaeophyceae) along a depth gradient. J. Phycology 52: 260-273

Thomisch K., Boebel O., Clark C.C., Hagen W., Spiesecke S., Zitterbart D.P., Van Opzeeland I. 2016: Spatio-temporal patterns in acoustic presence and distribution of Antarctic blue whales Balaenoptera musculus intermedia in the Weddell Sea. Endangered Species Res 30: 239-253

Lischka S., Hagen W. 2016: Seasonal dynamics of mesozooplankton in the Arctic Kongsfjord (Svalbard) during year-round observations from August 1998 to July 1999. Polar Biol. 39: 1859-1878

Buck B.H., Brueggemann J., Hundt M., Bischoff A.A., Hagen W. 2015: Improving nematode culture techniques and their effects on amino acid profile with considerations on production costs. J. Appl. Ichthyol. 31: 1-9

Koch K.,Thiel M., Tellier F., Hagen W., Graeve M., Tala F., Laeseke P., Bischof K. 2015: Species separation within the Lessonia nigrescens complex (Phaeophyceae, Laminariales) is mirrored by ecophysiological traits. Bot. Mar. 58: 81-92

Auerswald L., Meyer B., Teschke M., Hagen W., Kawaguchi S. 2015: Physiological response of adult Antarctic krill, Euphausia superba, to long-term starvation. Polar Biol. 38: 763-780

Peters J., Diekmann R., Clemmesen C., Hagen W. 2015: Lipids as a proxy for larval starvation and feeding condition in small pelagic fish - a field approach on match-mismatch effects on Baltic sprat. Mar. Ecol. Prog. Ser. 531: 277-292

Beermann J., Boos K. 2015: Flexible microhabitat partitioning between hemi-sessile congeners. Mar. Ecol. Prog. Ser. 520: 143-151

Niehoff B., Kreibich T., Saborowski R., Hagen W. 2014: Feeding history can influence physiological responses of copepods: an experimental study comparing different cohorts of Temora longicornis from the Southern North Sea. J. Exp. Mar. Biol. Ecol. 469: 143-149

Schukat A., Auel H., Teuber L., Lahajnar N., Hagen W. 2014: Complex trophic interactions of calanoid copepods in the Benguela upwelling system. J. Sea Res. 85: 186-196

Tiedemann M., Kloppmann M., Ulleweit J., Gröger J.P., Hagen W. 2014: A spatial analysis of larval fish assemblages of the Celtic Sea: implications of bathymetry and ocean warming. Mar. Biol. Res. 10: 482-493

Kleinertz S., Damriyasa I.M., Hagen W., Theisen S., Palm H. 2014: An environmental assessment of the parasite fauna of the reef-associated grouper Epinephelus areolatus from Indonesian waters. J. Helminthology 88: 50-63

Teuber L., Schukat A., Hagen W., Auel H. 2014: Trophic interactions and life strategies of epi- to bathypelagic calanoid copepods in the tropical Atlantic. J. Plankton Res. 36: 1109-1123

Bode M., Auel H., Kreiner A., van der Plas A., Louw D., Horaeb R., Hagen W. 2014: Spatio-temporal variability of copepod abundance along the 20° S monitoring transect in the northern Benguela Upwelling System from 2005 to 2011. PLoS ONE 9 (5): e97738

Schründer S., Schnack-Schiel S.B., Auel H., Sartoris F.J. 2014: Observations of neutral buoyancy in diapausing copepods Calanoides acutus during austral winter. Polar Biol. 37: 1369-1371

Joiris C.R., Falck E., D’Hert D., Jungblut S., Boos K. 2014: An important late summer aggregation of fin whales Balaenoptera physalus, little auks Alle alle and Brünnich’s guillemots Uria lomvia in the eastern Greenland Sea and Fram Strait: influence of hydrographic structures. Polar Biol. 37: 1645–1657

Attaran-Fariman G., Beygmoradi A., Boos K. 2014: First record of Ophionereis dubia (Echinodermata: Ophiuroidea) from Chabahar Bay (Gulf of Oman, Iran). Mar. Biodiv. Rec 7: 1-5

Schründer, S., Schnack-Schiel, S.B., Auel, H., Sartoris, F.J. 2014: Observations of neutral buoyancy in diapausing copepods Calanoides acutus during Antarctic winter. Polar Biology 37:1369-1371

Pogoda B., Buck B.H., Saborowski R., Hagen W. 2013: Biochemical and elemental composition of the offshore-cultivated oysters Ostrea edulis and Crassostrea gigas. Aquaculture 400-401: 53-60

Schukat A., Bode M., Auel H., Carballo R., Martin B., Koppelmann R., Hagen W.  2013: Pelagic decapods in the northern Benguela upwelling system: Distribution, ecophysiology and contribution to active carbon flux. Deep-Sea Res. I 75: 146-156

Peters J., Dutz J., Hagen W. 2013: Trophodynamics and life history traits of the calanoid copepods Temora longicornis and Acartia longiremis in the Central Baltic Sea. J. Plankton Res. 35: 595-609

Schukat A., Teuber L., Hagen W., Wasmund N., Auel H. 2013: Energetics and carbon budgets of dominant calanoid copepods in the northern Benguela upwelling system. J. Exp. Mar. Biol. Ecol. 442: 1-9

Bode M., Schukat A., Hagen W., Auel H. 2013: Predicting metabolic rates of calanoid copepods. J. Exp. Mar. Biol. Ecol. 444: 1-7

Teuber L., Schukat A., Hagen W., Auel H. 2013: Distribution and ecophysiology of calanoid copepods in relation to the oxygen minimum zone in the eastern tropical Atlantic. PLoS ONE 8 (11): doi:10.1371/journal.pone.0077590 (published on-line)

Piepenburg D., Werner I., Hagen W. 2013: Biologie der Polarmeere. 30 Jahre biologische Meeresforschungen am Institut für Polarökologie (IPÖ) in Kiel. Polarforschung 83: 17-33

Schründer S., Schnack-Schiel S.B., Auel H., Sartoris F.J. 2013: Control of diapause by acidic pH and ammonium accumulation in the hemolymph of Antarctic copepods. PloS one 8:e77498.

Seemann, J., Sawall, Y., Auel, H., Richter, C. 2013: The use of lipids and fatty acids to measure the trophic plasticity of the coral Stylophora subseriata. Lipids 48: 275-286

Schründer, S., Schnack-Schiel, S.B., Auel, H., Sartoris, F.J. 2013: Control of diapause by acidic pH and ammonium accumulation in the hemolymph of Antarctic copepods. PLoS ONE 8: e77498. doi:10.1371/journal.pone.0077498

Teuber, L., Kiko, R., Séguin, F., Auel, H. 2013: Respiration rates of tropical Atlantic copepods in relation to the oxygen minimum zone. J. Exp. Mar. Biol. Ecol. 448: 28-36

Wessels H., Hagen W., Wiencke C., Karsten U. 2012. On the potential of fatty acids as trophic markers in Arctic grazers: Feeding experiments with sea urchins and amphipods fed nine diets of macroalgae. Polar Biol.: 35: 555-565

Grote B., Ekau W., Stenevik E.K., Clemmesen C., Verheye H.M., Lipinski M.R., Hagen W. 2012: Characteristics of survivors - growth and nutritional condition of early life stages of the hake species Merluccius paradoxus and M. capensis in the southern Benguela ecosystem. ICES J. Mar. Science 69: 553-562

Hu M.Y., Hagen W., Jeng M.S., Saborowski R. 2012: Metabolic energy demand and food utilization of the hydrothermal vent crab Xenograpsus testudinatus (Crustacea: Brachyura). Aquatic Biol. 15: 11-25

Grote B., Stenevik E.K., Ekau W, Verheye H.M., Lipinski M.R., Hagen W. 2012: Spawning strategies and transport of early stages of the two Cape hake species, Merluccius paradoxus and M. capensis, in the southern Benguela upwelling system. Afr. J. Mar. Sci. 34: 195-204

Pogoda B., Jungblut S., Buck B.H., Hagen W. 2012: Infestations of parasitic copepods in oysters and mussels: differences between nearshore wild banks and an offshore cultivation site in the German Bight. J. Applied Ichthyol. 28: 756-765

Kattner G., Graeve M., Hagen W. 2012: Energy reserves of Southern Ocean copepods: triacylglycerols with unusually long-chain monounsaturated fatty acids. Mar. Chem. 138: 7-12

Laakmann, S., Auel, H., Kochzius, M. (2012) Evolution in the deep sea: Biological traits, ecology and phylogenetics of pelagic copepods. Molecular Phylogenetics and Evolution 65: 535-546

Grote B., Hagen W., Lipinski M.R., Verheye H.M., Stenevik E.K., Ekau W. 2011: Lipids and fatty acids as indicators of egg condition, larval feeding and maternal effects in Cape hakes (Merluccius paradoxus and M. capensis). Mar. Biol. 158: 1005-1017

von Harbou L., Dubischar C.D., Pakhomov E.A., Hunt B.P.V., Hagen W., Bathmann U. 2011:  Salps in the Lazarev Sea, Southern Ocean: I. Feeding dynamics. Mar. Biol. 158: 2009-2026

Pogoda B., Buck B.H., Hagen W. 2011: Growth performance and condition of oysters (Crassostrea gigas and Ostrea edulis) farmed in an offshore environ­ment (North Sea, Germany). Aquaculture 319: 484-492

Kreibich T., Saborowski R., Hagen W., Niehoff B. 2011: Influence of short-term nutritional variations on digestive enzyme and fatty acid patterns of the calanoid copepod Temora longicornis. J. Exp. Mar. Biol. Ecol. 407: 182-189

Piepenburg, D., Werner, I., Auel, H., Peter, H.-U. (2011) Der Rückgang des polaren Meereises und seine ökologischen Auswirkungen. In: Lozan, J. L., Graßl H., Karbe L., Reise, K. (eds.) Warnsignal Klima: Die Meere – Änderungen & Risiken. Verlag Wissenschaftliche Auswertungen.

Ramp C., Palsbøll P.J., Berube M., Hagen W., Sears R. 2010: Sex-specific survival in the humpback whale Megaptera novaeangliae in the Gulf of St. Lawrence, Canada. Mar. Ecol. Prog. Ser. 400: 267-276

Ramp C., Hagen W., Palsbøll P.J., Berube M., Sears R. 2010: Age-related multi-year associations in female humpback whales  (Megaptera novaeangliae) in the Gulf of St. Lawrence, Canada. Behavioral Ecol. Sociobiol. 64: 1563-1576

Brey T., Müller-Wiegmann C., Zittier Z.M.C., Hagen W. 2010: Body composition in aquatic organisms – a global data bank of relationships between mass, elemental composition and energy content. J. Sea Res. 64: 334-340

Kreibich T., Hagen W., Saborowski R. 2010: Food utilization of two sympatric crustaceans from Greenland Sea waters: Meganyctiphanes norvegica (Euphau­siacea) and Hymenodora glacialis (Decapoda, Caridea). Mar. Ecol. Prog. Ser. 413: 105-115

Kruse S., Hagen W., Bathmann U. 2010: Feeding ecology and energetics of the Antarctic chaetognaths Eukrohnia hamata, E. bathypelagica and E. bathy­antarctica. Mar. Biol. 157: 2289-2303

Laakmann, S., Auel, H. (2010) Longitudinal and vertical trends in stable isotope signatures (δ13C and δ15N) of omnivorous and carnivorous copepods across the South Atlantic Ocean. Marine Biol. 157:463-471

Ekau, W., Auel, H., Pörtner, H.-O., Gilbert, D. (2010) Impacts of hypoxia on the structure and processes in pelagic communities (zooplankton, macro-invertebrates and fish). Biogeosciences 7:1669-1699

Gentsch E., Kreibich T., Hagen W., Niehoff B. 2009: Dietary shifts in the copepod Temora longicornis during spring: evidence from stable isotope signatures, fatty acid biomarkers and feeding experiments. J. Plankton Res. 31: 45-60

Linton S.M., Allardyce B.J., Hagen W., Wencke P., Saborowski R. 2009: Food utilisation and digestive ability of aquatic and semi-terrestrial crayfishes, Cherax destructor and Engaeus sericatus (Astacidae, Parastacidae). J. Comp. Physiol. B - Biochem. Systemic Environm. Physiol. 179: 493-507

Rückert S., Hagen W., Yuniar A.T., Palm H.W. 2009: Metazoan fish parasites of Segara Anakan Lagoon, Indonesia, and their potential use as biological indicators. Regional Environmental Change 9 (4): 315-328

Kattner G., Hagen W. 2009: Lipids in marine copepods: Latitudinal characteristics and perspective to global warming. In: Lipids in Aquatic Ecosystems (M.T. Arts, M. Brett and M. Kainz, eds.), Springer, Berlin. 377 pp.

Pasternak A., Kattner G., Hagen W., Schiel S. 2009: Lipids dynamics and feeding of dominant Antarctic calanoid copepods in the eastern Weddell Sea in December. Polar Biol. 32: 1597-1606

Schiel S., Auel H., Hagen W. 2009: Zooplankton of the Southern Ocean. In: Biological Studies in Polar Oceans - Exploration of Life in Icy Waters. Wissenschaftsverlag NW (G. und I. Hempel, eds.), 352 pp.

Hagen W., Schiel S., Pasternak A., Auel H. 2009: Survival under extreme conditions. In: Biological Studies in Polar Oceans - Exploration of Life in Icy Waters. Wissenschaftsverlag NW (G. und I. Hempel, eds.), 352 pp.

Auel H., Hagen W., Schiel S. 2009: Size does matter - in the sea of giants and dwarfs. In: Biological Studies in Polar Oceans - Exploration of Life in Icy Waters. Wissenschaftsverlag NW (G. Hempel and I. Hempel, eds.), 352 pp.

Laakmann, S., Kochzius, M., Auel, H. (2009) Ecological niches of Arctic deep-sea copepods: Vertical partitioning, dietary preferences and different trophic levels minimize inter-specific competition. Deep-Sea Res. I 56:741-756

Laakmann, S., Stumpp, M., Auel, H. (2009) Vertical distribution and dietary preferences of deep-sea copepods (Euchaetidae and Aetideidae; Calanoida) in the vicinity of the Antarctic Polar Front. Polar Biol. 32:679-689

Auel, H., Ekau, W. (2009) Distribution and respiration of the high-latitude pelagic amphipod Themisto gaudichaudi in the Benguela Current in relation to upwelling intensity. Prog. Oceanogr. 83:237-241

Auel, H. (2009) Cryo-pelagic coupling. In: Hempel, I., Hempel, G. (eds.) Biological Studies in Polar Oceans: Exploration of Life in Icy Waters. Wirtschaftsvlg. Nordwest, p. 58

Auel, H., Jennerjahn, T., Salita, J. (2009) Tropical aquatic ecosystems – from large to small. In: Wolff, M. (ed.) Tropical waters and their Living Resources: Ecology, Assessment and Management. Hauschild Verlag, Bremen, pp. 25-45

Böttger-Schnack R., Hagen W., Schnack D. 2008: Microcopepod community structure and in the Gulf of Aqaba and the northern Red Sea, with special reference to Oncaeidae (Poecilostomatoida). J. Plankton Res. 30: 529-550

Schnack-Schiel S.B., Niehoff B., Hagen W., Böttger-Schnack R., Cornils A., Dowidar M.M., Pasternak A., Stambler N., Stübing D., Richter C. 2008: Population dynamics and life strategies of Rhincalanus nasutus (Copepoda) at the onset of the spring bloom in the Gulf of Aqaba (Red Sea). J. Plankton Res. 30: 655-672

Molis M., Wessels H., Hagen W., Karsten U., Wiencke C. 2008: Do sulphuric acid and the brown alga Desmarestia viridis support community structure in Arctic kelp patches by altering grazing impact, distribution patterns, and behaviour of sea urchins? Polar Biol. 32: 71-82

Kreibich T., Saborowski R., Hagen W., Niehoff B. 2008: Short-term variation of nutritive and metabolic parameters in Temora longicornis females (Crustacea, Copepoda) as a response to diet shift and starvation. Helgoland Mar. Res. 62: 241-249.

Lischka S., Hagen W. 2007: Seasonal lipid dynamics of the copepods Pseudocalanus minutus (Calanoida) and Oithona similis (Cyclopoida) in the Arctic Kongsfjorden (Svalbard). Mar. Biol. 150: 445-454

Hagen W., Yoshida T., Virtue P., Kawaguchi S., Swadling K, Nicol S., Nichols P. 2007: Effect of a carnivorous diet on the lipids, fatty acids and condition of Antarctic krill, Euphausia superba. Proc. 2nd SCAR Conference. Antarctic Science 19: 183-188

Grote B., Ekau W., Hagen W., Huggett J.A., Verheye H.M. 2007 Early life history strategy of Cape hake in the Benguela upwelling region. Fisheries Research 86: 179-187

Peters J., Dutz J., Hagen W. 2007: Role of essential fatty acids on the reproductive success of the copepod Temora longicornis in the North Sea. Mar. Ecol. Prog. Ser. 341: 153-163

Lischka S., Gimenez L., Hagen W., Ueberschär B. 2007: Seasonal changes in digestive enzyme activity (trypsin) of the copepods Pseudocalanus minutus (Calanoida) and Oithona similis (Cyclopoida) in the Arctic Kongsfjorden (Svalbard). Polar Biol. 30: 1331-1341

Kattner G., Hagen W., Lee R.F., Campbell R., Deibel D., Falk-Petersen S., Graeve M., Hansen B.W., Hirche H.-J., Jónasdóttir S.H., Madsen M.L., Mayzaud P., Müller-Navarra D., Nichols P.D., Paffenhöfer G.-A., Pond D., Saito H., Stübing D., and Virtue P. 2007: Perspectives on marine zooplankton lipids. Canadian Journal of Fisheries and Aquatic Sciences 64: 1628-1639

Auel, H., Verheye, H.M. (2007) Hypoxia tolerance in the copepod Calanoides carinatus and the effect of the intermediate oxygen minimum layer on copepod vertical distribution in the northern Benguela upwelling system and Angola-Benguela Front. J. Exp. Mar. Biol. Ecol. 352:234-243

Lee R.F., Hagen W., Kattner G. 2006: Lipid storage in marine zooplankton - a review. Mar. Ecol. Prog. Ser. 307: 273-306

Wessels H., Hagen W., Molis M., Wiencke C., Karsten U. 2006: Intra- and interspecific differences in palatability of Arctic macroalgae from Kongsfjorden (Spitsbergen) for two benthic sympatric invertebrates. J. exp. mar. Biol. Ecol. 329: 20-33

Ramp C., Berube M, Hagen W., Sears R. 2006: Survival of adult blue whales (Balaenoptera musculus) in the Gulf of St. Lawrence, Canada. Mar. Ecol. Prog. Ser. 319: 287-295

Auel H., Hagen W. 2006: Eine virtuelle Reise durch die Weltmeere - über Energieflüsse, Nahrungswege und Anpassungspfade. S . 31-39. In: Faszination Meeresforschung Ein ökologisches Lesebuch (G. Hempel, I. Hempel, S. Schnack-Schiel, Hsgr.), Verlag H.M. Hauschild, Bremen, 462 S.

Elvers D., Böttger-Schnack, R. Blohm, D., Hagen, W. 2006: Sympatric size variants of the microcopepod Oncaea venusta exhibit distinct lineages in DNA sequences. Mar. Biol. 149: 503-513

Peters J., Renz J., Beusekom J. van, Boersma M., Hagen W. 2006: Trophodynamics and seasonal cycle of the copepod Pseudocalanus acuspes in the Central Baltic Sea (Bornholm Basin) - evidence from lipid composition. Mar. Biol. 149: 1417-1429

Hirche, H.J., Muyakshin, S., Klages, M, Auel, H. (2006) Aggregation of the Arctic copepod Calanus hyperboreus over the ocean floor of the Greenland Sea. Deep-Sea Res. I. 53:310-320

Auel H., Hagen W. 2005: Body mass and lipid dynamics of Arctic and Antarctic deep-sea copepods (Calanoida, Paraeuchaeta): ontogenetic and seasonal trends. Deep-Sea Res. 52: 1272-1283

Cornils A., Schnack-Schiel S., Hagen W., Dowidar M., Stambler N., Plähn O, Richter C. 2005: Spatial and temporal distribution of mesozooplankton in the Gulf of Aqaba and the northern Red Sea in February/March 1999. J. Plankton Res. 27: 505-518

Lischka S., Hagen W. 2005: Life history and seasonal variability in abundances of Pseudocalanus minutus (Calanoida) and Oithona similis (Cyclopoida) in the Arctic Kongsfjord (Svalbard). Polar Biol. 28: 910-921

Mehrtens F., Stolpmann M., Buchholz F., Hagen W., Saborowski R. 2005: Locomotory activity and exploration behaviour of juvenile European lobsters (Homarus gammarus) in the laboratory. Marine & Freshwater Behaviour & Physiology 38: 105-116

Verheye H.M., Hagen W., Auel H., Ekau W., Loick N., Rheenen I., Wencke P., Jones S. 2005: Life strategies, energetics and growth characteristics of Calanoides carinatus (Copepoda) in the Angola-Benguela Front region. African J. Mar. Sci. 27: 641-652

Auel H., Hagen W., Ekau W., Verheye H.M. 2005: Metabolic adaptations and reduced respiration of the copepod Calanoides carinatus during diapause at depth in the Angola-Benguela Front and northern Benguela upwelling regions. African J. Mar. Sci. 27: 653-657

Werner, I., Auel, H. (2005) Seasonal variability in abundance, respiration and lipid composition of Arctic under-ice amphipods. Mar. Ecol. Prog. Ser. 292:251-262

Thatje S., Lovrich G.A., Torres G., Hagen W. and Anger K. 2004: Changes in biomass, lipid, fatty acid and elemental composition during the abbreviated larval development of the subantarctic shrimp Campylonotus vagans. J. Exp. Mar. Biol. Ecol. 301: 159-174

Wessels H., Hagen W., Wiencke C., Karsten U. 2004: Trophic interactions between macroalgae and herbivores from Kongsfjorden (Svalbard). In: The coastal ecosystem of Kongsfjorden, Svalbard. Synopsis of biological research performed at the Koldewey Station in the years 1991 - 2003. Rep. Polar Res. 492: 63-72

Werner, I., Auel, H. (2004) Environmental conditions and overwintering strategies of planktonic metazoans in and below coastal fast ice in the Gulf of Finland (Baltic Sea). Sarsia 89:102-116

Werner, I., Auel, H., Kiko, R. (2004) Occurrence of Anonyx sarsi (Amphipoda: Lysianassoidea) below Arctic pack ice: an example for cryo-benthic coupling? Polar Biol. 27:474-481

Auel, H. (2004) Egg size and reproductive adaptations among Arctic deep-sea copepods (Calanoida, Paraeuchaeta). Helgol. Mar. Res. 58:147-153

Stübing D., Hagen W., Schmidt K. 2003: On the use of lipid biomarkers in marine food web analyses: an experimental case study on the Antarctic krill, Euphausia superba. Limnol. Oceanogr. 48: 1685-1700

Dalsgaard J., St. John M., Kattner G., Müller-Navarra D., Hagen W. 2003: Fatty acid trophic markers in the pelagic marine environment: a review. Adv. in Mar. Biol. 46: 225-340

Stübing D., Hagen W. 2003: Fatty acid biomarker ratios - suitable trophic indicators in Antarctic euphausiids? Polar Biol. 26: 774-782

Auel, H., Klages, M., Werner, I. (2003) Respiration and lipid content of the Arctic copepod Calanus hyperboreus overwintering 1 m above the seafloor at 2,300 m water depth in the Fram Strait. Mar. Biol. 143:275-282

Auel, H., Werner, I. (2003) Feeding, respiration and life history of the hyperiid amphipod Themisto libellula in the Arctic marginal ice zone of the Greenland Sea. J. Exp. Mar. Biol. Ecol. 296:183-197

Hagen W. 2002: Fortpflanzungsstrategien und energetische Anpassungen des polaren Zooplanktons. In: Der Ozean - Lebensraum und Klimasteuerung (G. Hempel, Hrsg.). Jahrbuch 2001/2002. Wittheit zu Bremen, Hauschild Verlag, Bremen S. 121-126

Auel H., Hagen W. 2002: Mesozooplankton community structure, abundance and biomass in the central Arctic Ocean. Mar. Biol. 140: 1013-1021

Auel H., Harjes M., Da Rocha R.,Stübing D., Hagen W. 2002: Lipid biomarkers indicating different ecological niches and trophic relationships of the hyperiid amphipods Themisto abyssorum and T. libellula within the Arctic food web. Polar Biol. 25: 374-383

Meyer B., Atkinson A., Stübing D., Oettl B., Hagen W., Bathmann U. 2002: Feeding and energy budget of Antarctic krill Euphausia superba at the onset of winter - I. Furcilia III larvae. Limnol. Oceanogr. 47: 943-952

Atkinson A., Meyer B., Bathmann U., Stübing D., Hagen W., Schmidt K. 2002. Feeding and energy budget of Antarctic krill Euphausia superba at the onset of winter - II. Juveniles and adults. Limnol. Oceanogr. 47: 953-966

Sommer U., Berninger U.-G., Böttger-Schnack R., Cornils A., Hagen W., Hansen T., Al-Najjar T., Post A.F., Schnack-Schiel S. B., Stibor H., Stübing D., Wickham S. 2002: Grazing during spring in the Gulf of Aqaba and the Northern Red Sea. Mar. Ecol. Prog. Ser. 239: 251-26

Werner, I., Auel, H., Friedrich, C. (2002) Carnivorous feeding and respiration of the Arctic under-ice amphipod Gammarus wilkitzkii. Polar Biol. 25:523-53

Lischka S., Knickmeier K. and Hagen W. 2001. Mesozooplankton communities during summer 1993 and autumn 1995 in the Arctic Laptev Sea. Polar Biol. 24: 186-199

Hagen W., Kattner G., Terbrüggen A., Van Vleet E.S. 2001: Lipid metabolism of the Antarctic krill Euphausia superba and its ecological implications. Mar. Biol. 139: 95-104

Böttger-Schnack R., Hagen W. and Schiel S.B. 2001: The microcopepod fauna in the Gulf of Aqaba, northern Red Sea: Species diversity and distribution of Oncaeidae (Poecilostomatoida). J. Plankton Res. 23: 1029-103

Hagen W., Auel H. 2001: Seasonal adaptations and the role of lipids in oceanic zooplankton. Zoology 104: 313-326

Hagen W. 2000: Lipids. In: ICES Zooplankton Methodology Manual (R. Harris, P. Wiebe, J. Lenz, H.R. Skjøldal, M. Huntley, eds.), Academic Press, San Diego, p. 113-119

Hagen W., Kattner G., Friedrich C. 2000: The lipid compositions of high-Antarctic notothenioid fish species with different life strategies. Polar Biol. 23: 785-791

Falk-Petersen S., Hagen W., Kattner G., Clarke A. and Sargent J.R. 2000. Lipids, trophic relationships and biodiversity in Arctic and Antarctic krill. Can. J. Fisheries and Aquatic Sciences 57: 178-191

Hagen W. 2000: Lipids. In: ICES Zooplankton Methodology Manual (R. Harris, P. Wiebe, J. Lenz, H.R. Skjøldal, M. Huntley, eds.), Academic Press, San Diego, p. 113-119

Hagen W., Kattner G., Friedrich C. 2000: The lipid compositions of high-Antarctic notothenioid fish species with different life strategies. Polar Biol. 23: 785-791

Falk-Petersen S., Hagen W., Kattner G., Clarke A. and Sargent J.R. 2000. Lipids, trophic relationships and biodiversity in Arctic and Antarctic krill. Can. J. Fisheries and Aquatic Sciences 57: 178-191

Meyer U., Hagen W., Medeiros C. 1998: Mercury in a northeastern Brazilian mangrove area, a case study: potential of the mangrove oyster Crassostrea rhizophorae as bioindicator for mercury. Mar. Biol. 131: 113-121

Kattner G., Hagen W., Graeve M., Albers C. 1998: Exceptional lipids and fatty acids in the pteropod Clione limacina from both polar oceans. Mar. Chem. 61: 219-228

Mumm N., Auel H., Hanssen H., Hagen W., Richter C., Hirche H.-J. 1998: Breaking the ice: Large scale distribution of mesozooplankton after a decade of Arctic and transpolar cruises. Polar Biol. 20: 189-197

Kattner G., Hagen W. 1998: Lipid metabolism of the Antarctic euphausiid Euphausia crystallorophias and its ecological implications. Mar. Ecol. Prog. Ser. 170: 203-213

Hagen W. & Kattner G. 1998: Principles of lipid metabolism in the Antarctic euphausiid Thysanoessa macrura and ecological implications. Limnol. Oceanogr. 43: 1894-1901

Schnack-Schiel S.B., Hagen W., Mizdalski E. 1998: Seasonal Carbon Dynamics of Antarctic Copepods in the Weddell Sea. Diversity and vertical distribution patterns of the calanoid and cyclopoid community. J. Marine Systems 17: 305-31

Wöhrmann A.P.A., Hagen W., Kunzmann A. 1997: Adaptations of the Antarctic silverfish Pleuragramma antarcticum (Pisces: Nototheniidae) to pelagic life in high-Antarctic waters. Mar. Ecol. Prog. Ser. 151: 205-218

Hubold G., Hagen W. 1997: Seasonality of feeding and lipid content in juvenile Pleuragramma antarcticum (Pisces: Nototheniidae) in the southern Weddell Sea. In: Antarctic communities: species, structure and survival (Battaglia B., Valencia J., Walton D.W.H., eds.) Sixth Biological SCAR Symp., Cambridge Univ. Press, pp. 277-283

Hagen W., Van Vleet E.S., Kattner G. 1996: Seasonal lipid storage as over­wintering strategy of Antarctic krill. Mar. Ecol. Prog. Ser. 134: 85-89

Kattner G., Hagen W., Falk-Petersen S., Sargent J.R., Henderson R.J. 1996: Antarctic krill Thysanoessa macrura: lipogenic pathways. Mar. Ecol. Prog. Ser. 134: 295-298

Hagen W., Schnack-Schiel S.B. 1996: Seasonal lipid dynamics in dominant Antarctic copepods: Energy for overwintering or reproduction? Deep-Sea Res. 43: 139-158

Albers C., Kattner G., Hagen W. 1996: The compositions of wax esters, triacyl­glycerols and phospholipids in Arctic and Antarctic copepods: evidence of energetic adaptations. Mar. Chem. 55: 347-358

Hagen W. 1995: Ökosystem Polarmeere - ohne Fett kein Überleben? In: Biologie der Polarmeere - Erlebnisse und Ergebnisse. S. 180-186 (I. Hempel & G. Hempel, Hsgr.). Gustav Fischer Vlg. Jena, 355 S.

Auel, H. (1995) The regional and vertical distribution of mesozooplankton in the European sector of the Arctic Ocean – Review and new data. Diploma thesis, University of Kiel, in German, 97 pages

Kattner G., Graeve M., Hagen W. 1994: Ontogenetic and seasonal changes in lipid and fatty acid/alcohol compositions of the dominant Antarctic copepods Calanus propinquus, Calanoides acutus and Rhincalanus gigas. Mar. Biol. 118: 637-644

Piatkowski U., Hagen W. 1994: Distribution and lipid composition of early life stages of the cranchiid squid Galiteuthis glacialis (Chun) in the Weddell Sea, Antarctica. Antarctic Science 6 (2): 235-239

Graeve M., Hagen W., Kattner G. 1994: Herbivorous or omnivorous? On the significance of lipid compositions as trophic markers in Antarctic copepods. Deep-Sea Res. 41: 915-924

Friedrich C., Hagen W. 1994: Lipid contents of five species of notothenioid fish from high-Antarctic waters and ecological implications. Polar. Biol. 14: 359-369

Hirche H.-J., Hagen W., Mumm N., Richter C. 1994: The North­east Water Polynya, Greenland Sea III. Meso- and macrozoo­plankton distribution and production of dominant herbivorous copepods during spring. Polar Biol. 14: 491-503

Graeve M., Kattner G., Hagen W. 1994: Diet-induced changes of the lipid composition of herbivorous Arctic copepods: Experimental evidence of fatty acids as trophic markers. J. Exp. Mar. Biol. Ecol. 182: 97-110

Schnack-Schiel S.B., Hagen W. 1994: Life cycle strategies and seasonal variations in distribution and population structure of four dominant calanoid copepod species in the eastern Weddell Sea, Antarctica. J. Plankton Res. 16: 1543-1566

Hagen W., Kattner G., Graeve M. 1993: Calanoides acutus and Calanus propinquus, Antarctic copepods with different lipid storage modes via wax esters or triacylglycerols. Mar. Ecol. Prog. Ser. 97: 135-142

Schnack-Schiel S., Hagen W., Mizdalski E. 1991: Seasonal comparison of Calanoides acutus and Calanus propinquus  (Copepoda: Calanoida) in the southeastern Weddell Sea, Antarctica. Mar. Ecol. Progr. Ser. 70: 17-27

Boysen-Ennen, E., Hagen, W., Hubold, G., Piatkowski, U. 1991: Zooplankton biomass in the ice-covered Weddell Sea, Antarctica. Mar. Biol. 111: 227-235

Hagen, W. 1989: On the significance of lipids in Antarctic zooplankton. Rep. Polar Res. 49: 1-129. Canadian Translation of Fisheries and Aquatic Sciences (CTFAS) 5458: 149 pp. (English translation of PhD thesis)

Hagen W., Kapp H. 1986: Heterokrohnia longicaudata, a new species of Chaetognatha from Antarctic waters. Polar Biol. 5: 181-183

Hagen W. 1985: On distribution and population structure of Antarctic Chaeto­gnatha. Meeresforschung (Rep. Mar. Res.) 30: 280-291

Kapp H., Hagen W. 1985: Two new species of Heterokrohnia (Chaetognatha) from Antarctic waters. Polar Biol. 4: 53-59