15 results on '"Mintenbeck, K"'
Search Results
2. Key Risks across Sectors and Regions
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O'Neill, B., van Aalst, M.K., Zaiton Ibrahim, Z., Berrang Ford, L., Bhadwal, S., Buhaug, H., Diaz, D., Frieler, F., Garschagen, M., Magnan, A., Midgley, G., Mirzabaev, A., Thomas, A., Warren, R., Pörtner, H.-O., Roberts, D.C., Tignor, M., Poloczanska, E.S., Mintenbeck, K., Alegría, A., Craig, M., Langsdorf, S., Löschke, S., Möller, V., Okem, A., Rama, B., Department of Applied Earth Sciences, UT-I-ITC-4DEarth, Faculty of Geo-Information Science and Earth Observation, and Digital Society Institute
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- 2022
3. Response of Antarctic benthic communities to disturbance: first results from the artificial Benthic Disturbance Experiment on the eastern Weddell Sea Shelf, Antarctica
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Gerdes, D., Isla, E., Knust, R., Mintenbeck, K., and Rossi, S.
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- 2008
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4. Towards the trophic structure of the Bouvet Island marine ecosystem
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Jacob, U., Brey, T., Fetzer, I., Kaehler, S., Mintenbeck, K., Dunton, K., Beyer, K., Struck, U., Pakhomov, E.A., and Arntz, W.E.
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- 2006
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5. Depth-dependence in stable isotope ratio [delta].sup.15N of benthic POM consumers: The role of particle dynamics and organism trophic guild
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Mintenbeck, K., Jacob, U., Knust, R., Arntz, W.E., and Brey, T.
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Earth sciences - Abstract
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.dsr.2007.03.005 Byline: K. Mintenbeck (a), U. Jacob (b)(c), R. Knust (a), W.E. Arntz (a), T. Brey (a) Keywords: [delta].sup.15N variability; Suspension feeders; Water depth; Particulate organic matter; POM dynamics; Particle settling; Antarctica; Weddell Sea Abstract: The stable nitrogen isotope ratio ([delta].sup.15N) is an established indicator of trophic hierarchy in marine food-web studies. Most of these studies presume that spatial variation in the primary food source is negligible, although a water-depth-related increase in [delta].sup.15N of particulate organic matter (POM) has been found in many systems. We used the high-Antarctic Weddell Sea shelf and slope ecosystem to test whether such a depth-related change in [delta].sup.15N is reflected at higher trophic levels, i.e., benthic consumers of POM. In suspension feeders (SF) we found a significant increase in [delta].sup.15N with water depth of up to 9.8a[degrees], whereas in deposit feeders (DF) a depth effect was barely detectable. Particle-size preferences of the two feeding guilds combined with particle-size-dependent sinking velocities and biogeochemical reworking of POM are discussed as the major causes of these differences. It is essential to marine food-web studies to take into account the general depth effect on POM [delta].sup.15N as well as potential feeding-guild-specific differences in the response of POM consumer tissue [delta].sup.15N to avoid serious bias and misinterpretation of stable-isotope-based trophic information. Author Affiliation: (a) Alfred Wegener Institute for Polar and Marine Research, P.O. Box 120161, 27515 Bremerhaven, Germany (b) Department of Zoology, Ecology and Plant Science, Distillery Fields, University College Cork, Ireland (c) Environmental Research Institute, Lee Road, University College Cork, Ireland Article History: Received 28 July 2006; Revised 13 February 2007; Accepted 7 March 2007
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- 2007
6. Depth-dependence in stable isotope ratio δ 15N of benthic POM consumers: The role of particle dynamics and organism trophic guild
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Mintenbeck, K., Jacob, U., Knust, R., Arntz, W.E., and Brey, T.
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- 2007
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7. The role of iceberg scours in niche separation within the Antarctic fish genus Trematomus
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Brenner, M., Buck, B., Cordes, S., Dietrich, L., Jacob, U., Mintenbeck, K., Schröder, A., Brey, T., Knust, R., and Arntz, W.
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- 2001
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8. How to account for the lipid effect on carbon stable-isotope ratio (δ13C): sample treatment effects and model bias.
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Mintenbeck, K., Brey, T., Jacob, U., Knust, R., and Struck, U.
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LIPIDS , *FISHES , *CARBON isotopes , *BIOCHEMISTRY , *TISSUES , *ACIDIFICATION - Abstract
This study investigated the impact of lipid extraction, CaCO3 removal and of both treatments combined on fish tissue δ13C, δ15N and C:N ratio. Furthermore, the suitability of empirical δ13C lipid normalization and correction models was examined. δ15N was affected by lipid extraction (increase of up to 1·65‰) and by the combination of both treatments, while acidification alone showed no effect. The observed shift in δ15N represents a significant bias in trophic level estimates, i.e. lipid-extracted samples are not suitable for δ15N analysis. C:N and δ13C were significantly affected by lipid extraction, proportional to initial tissue lipid content. For both variables, rates of change with lipid content (ΔC:N and Δδ13C) were species specific. All tested lipid normalization and correction models produced biased estimates of fish tissue δ13C, probably due to a non-representative database and incorrect assumptions and generalizations the models were based on. Improved models need a priori more extensive and detailed studies of the relationships between lipid content, C:N and δ13C, as well as of the underlying biochemical processes. [ABSTRACT FROM AUTHOR]
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- 2008
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9. Depth-dependence in stable isotope ratio δ15N of benthic POM consumers: The role of particle dynamics and organism trophic guild
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Mintenbeck, K., Jacob, U., Knust, R., Arntz, W.E., and Brey, T.
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STABLE isotopes , *NITROGEN , *FOOD chains , *BIOTIC communities - Abstract
Abstract: The stable nitrogen isotope ratio (δ15N) is an established indicator of trophic hierarchy in marine food-web studies. Most of these studies presume that spatial variation in the primary food source is negligible, although a water-depth-related increase in δ15N of particulate organic matter (POM) has been found in many systems. We used the high-Antarctic Weddell Sea shelf and slope ecosystem to test whether such a depth-related change in δ15N is reflected at higher trophic levels, i.e., benthic consumers of POM. In suspension feeders (SF) we found a significant increase in δ15N with water depth of up to 9.8‰, whereas in deposit feeders (DF) a depth effect was barely detectable. Particle-size preferences of the two feeding guilds combined with particle-size-dependent sinking velocities and biogeochemical reworking of POM are discussed as the major causes of these differences. It is essential to marine food-web studies to take into account the general depth effect on POM δ15N as well as potential feeding-guild-specific differences in the response of POM consumer tissue δ15N to avoid serious bias and misinterpretation of stable-isotope-based trophic information. [Copyright &y& Elsevier]
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- 2007
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10. Central and South America
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Castellanos, Edwin J, Lemos, Maria Fernanda, Astigarraga, Laura, Chacón, Noemí, Cuvi, Nicolás, Huggel, Christian, Miranda, Liliana, Moncassim Vale, Mariana, Ometto, Jean Pierre, Peri, Pablo L, Postigo, Julio C, Ramajo, Laura, Roco, Lisandro, Rusticucci, Matilde, University of Zurich, Pörtner, H-O, Roberts, D C, Tignor, M, Poloczanska, E S, Mintenbeck, K, Alegría, A, Craig, M, Langsdorf, S, Löschke, S, Möller, V, Okem, A, Rama, B, Pörtner, H.-O., Roberts, D.C., Tignor, M., Poloczanska, E.S., Mintenbeck, K., Alegría, A., Craig, M., Langsdorf, S., Löschke, S., V. Möller, A., Okem, A., and Rama, B.
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Impactos ,Mitigation ,2105 Renewable Energy, Sustainability and the Environment ,Adaptación ,2300 General Environmental Science ,Central and South America ,Deforestation ,910 Geography & travel ,Comunidades Indígenas ,Governance ,Climatic Factors ,Ecosystems Services ,Biodiversity ,Ocean and Coastal Ecosystems ,Sostenibilidad ,10122 Institute of Geography ,Sustainability ,Impacts ,Mitigación ,Conservación ,Resiliencia ,Increasing Temperature ,Glaciers ,Riesgos ,Risk ,Soil Degradation ,Servicios de los Ecosistemas ,Climate Change ,Vulnerability ,Conservation ,Riesgo ,Biodiversidad ,Degradación del Suelo ,Glaciares ,Adaptation ,Factores Climáticos ,Región Americana ,Indigenous Peoples ,Incremento de la Temperatura ,Resilience ,Hazards ,Land Use Change ,2739 Public Health, Environmental and Occupational Health ,América Central y del Sur ,American Region ,Ecosistemas Oceánicos y Costeros ,Deforestación ,Cambio Climático ,Gobernanza ,Cambio de Uso de la Tierra ,Vulnerabilidad - Abstract
The chapter is divided into two main sections. The first section follows an integrative approach in which hazards, exposure, vulnerability, impacts and risks are discussed following the eight climatically homogeneous sub-regions described in WGI AR6 (Figure 12.1). The second section assesses the implemented and proposed adaptation practices by sector; in doing so, it connects to the WGII AR6 crosschapter themes. The storyline is then a description of the hazards, exposure, vulnerability and impacts providing as much detail as is available in the literature at the sub-regional level, followed by the identification of risks as a result of the interaction of those aspects. This integrated sub-regional approach ensures a balance in the text, particularly for countries that are usually underrepresented in the literature but that show a high level of vulnerability and impacts, such as those observed in CA. The sectoral assessment of adaptation that follows is useful for policymakers and implementers, usually focused and organised by sectors, government ministries or secretaries that can easily locate the relevant adaptation information for their particular sector. To ensure coherence in the chapter, a summary of the assessed adaptation options by key risks is presented, followed by a feasibility assessment for some relevant adaptation options. The chapter closes with case studies and a discussion of the knowledge gaps evidenced in the process of the assessment. EEA Santa Cruz Fil: Castellanos, Edwin J. Universidad del Valle de Guatemala; Guatemala. Fil: Lemos, Maria Fernanda. Pontifical Catholic University of Rio de Janeiro; Brasil. Fil: Astigarraga, Laura. Universidad de la República; Uruguay. Fil: Chacón, Noemí. Instituto Venezolano de Investigaciones Científicas; Venezuela. Fil: Cuvi, Nicolás. Facultad Latinoamericana de Ciencias Sociales (FLACSO); Ecuador. Fil: Huggel, Christian. University of Zurich; Switzerland. Fil: Miranda Sara, Liliana Raquel. Foro Ciudades para la Vida; Peru. Fil: Moncassim Vale, Mariana. Federal University of Rio de Janeiro; Brasil. Fil: Ometto, Jean Pierre. National Institute for Space Research; Brasil. Fil: Peri, Pablo Luis. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Santa Cruz; Argentina. Fil: Peri, Pablo Luis. Universidad Nacional de la Patagonia Austral; Argentina. Fil: Peri, Pablo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fil: Postigo, Julio C. Indiana University; Estados Unidos. Fil: Ramajo Gallardo, Laura. Adolfo Ibanez University; Chile. Fil: Roco, Lisandro. Catholic University of The North; Chile. Fil: Rusticucci, Matilde Monica. Universidad de Buenos Aires; Argentina.
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- 2022
11. Cross-Chapter Paper 5: Mountains
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Adler, Carolina, Wester, Philippus, Bhatt, Indra D, Huggel, Christian, Insarov, Gregory, Morecroft, Michael, Muccione, Veruska, Prakash, Anjal, University of Zurich, Pörtner, H-O, Roberts, D C, Tignor, M, Poloczanska, E S, Mintenbeck, K, Alegría, A, Craig, M, Langsdorf, S, Löschke, S, Möller, V, Okem, A, and Rama, B
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10122 Institute of Geography ,910 Geography & travel - Published
- 2022
12. High mountain areas
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Hock, Regine, Rasul, Golam, Adler, Carolina, Cáceres, Bolívar, Gruber, Stephan, Hirabayashi, Yukiko, Jackson, Miriam, Kääb, Andreas, Kang, Shichang, Kutuzov, Stanislav, Milner, Alexander, Molau, Ulf, Morin, Samuel, Orlove, Ben, Steltzer, Heidi, Viviroli, Daniel, et al, University of Zurich, Pörtner, H O, Roberts, D C, Masson-Delmotte, V, Zhai, P, Tignor, M, Poloczanska, E, Mintenbeck, K, Alegría, A, Nicolai, M, Okem, A, Petzold, J, Rama, B, and Weyer, N M
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10122 Institute of Geography ,910 Geography & travel - Published
- 2019
13. MRI and MRS on preserved samples as a tool in fish ecology.
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Bock C, Wermter FC, and Mintenbeck K
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- Animals, Formaldehyde, Lipids analysis, Fishes anatomy & histology, Magnetic Resonance Imaging methods, Magnetic Resonance Spectroscopy methods, Marine Biology methods
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Magnetic Resonance Imaging (MRI) and Magnetic Resonance Spectroscopy (MRS) gain increasing attention and importance as a tool in marine ecology. So far, studies were largely limited to morphological studies, e.g. for the creation of digital libraries. Here, the utility of MRI and MRS for ecologists is tested and exemplified using formalin preserved samples of the Antarctic silverfish, Pleuragramma antarctica. As this species lacks a swim bladder, buoyancy is attained by the deposition of large amounts of lipids that are mainly stored in subcutaneous and intermuscular lipid sacs. In this study MRI and MRS are not only used to study internal morphology, but additionally to investigate functional morphology and to measure parameters of high ecological interest. The data are compared with literature data obtained by means of traditional ecological methods. The results from this study show that MR scans are not only an alternative to histological sections (as shown before), but even allow the visualization of particular features in delicate soft tissues, such as Pleuragramma's lipid sacs. 3D rendering techniques proved to be a useful tool to study organ volumes and lipid content, which usually requires laborious chemical lipid extraction and analysis. Moreover, the application of MRS even allows for an analysis of lipids and fatty acids within lipid sacs, which wouldn't be possible using destructive methods. MRI and MRS, in particular when used in combination, have the capacity to provide useful data on parameters of high ecological relevance and thus have proven to be a highly valuable addition, if not alternative, to the classical methods., (Copyright © 2016 Elsevier Inc. All rights reserved.)
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- 2017
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14. Metabolic shifts in the Antarctic fish Notothenia rossii in response to rising temperature and PCO2.
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Strobel A, Bennecke S, Leo E, Mintenbeck K, Pörtner HO, and Mark FC
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Introduction: Ongoing ocean warming and acidification increasingly affect marine ecosystems, in particular around the Antarctic Peninsula. Yet little is known about the capability of Antarctic notothenioid fish to cope with rising temperature in acidifying seawater. While the whole animal level is expected to be more sensitive towards hypercapnia and temperature, the basis of thermal tolerance is set at the cellular level, with a putative key role for mitochondria. This study therefore investigates the physiological responses of the Antarctic Notothenia rossii after long-term acclimation to increased temperatures (7°C) and elevated PCO2 (0.2 kPa CO2) at different levels of physiological organisation., Results: For an integrated picture, we analysed the acclimation capacities of N. rossii by measuring routine metabolic rate (RMR), mitochondrial capacities (state III respiration) as well as intra- and extracellular acid-base status during acute thermal challenges and after long-term acclimation to changing temperature and hypercapnia. RMR was partially compensated during warm- acclimation (decreased below the rate observed after acute warming), while elevated PCO2 had no effect on cold or warm acclimated RMR. Mitochondrial state III respiration was unaffected by temperature acclimation but depressed in cold and warm hypercapnia-acclimated fish. In both cold- and warm-exposed N. rossii, hypercapnia acclimation resulted in a shift of extracellular pH (pHe) towards more alkaline values. A similar overcompensation was visible in muscle intracellular pH (pHi). pHi in liver displayed a slight acidosis after warm normo- or hypercapnia acclimation, nevertheless, long-term exposure to higher PCO2 was compensated for by intracellular bicarbonate accumulation., Conclusion: The partial warm compensation in whole animal metabolic rate indicates beginning limitations in tissue oxygen supply after warm-acclimation of N. rossii. Compensatory mechanisms of the reduced mitochondrial capacities under chronic hypercapnia may include a new metabolic equilibrium to meet the elevated energy demand for acid-base regulation. New set points of acid-base regulation under hypercapnia, visible at the systemic and intracellular level, indicate that N. rossii can at least in part acclimate to ocean warming and acidification. It remains open whether the reduced capacities of mitochondrial energy metabolism are adaptive or would impair population fitness over longer timescales under chronically elevated temperature and PCO2.
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- 2012
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15. Consumer-resource body-size relationships in natural food webs.
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Brose U, Jonsson T, Berlow EL, Warren P, Banasek-Richter C, Bersier LF, Blanchard JL, Brey T, Carpenter SR, Blandenier MF, Cushing L, Dawah HA, Dell T, Edwards F, Harper-Smith S, Jacob U, Ledger ME, Martinez ND, Memmott J, Mintenbeck K, Pinnegar JK, Rall BC, Rayner TS, Reuman DC, Ruess L, Ulrich W, Williams RJ, Woodward G, and Cohen JE
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- Animals, Ecosystem, Fresh Water, Oceans and Seas, Predatory Behavior physiology, Body Size physiology, Food Chain
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It has been suggested that differences in body size between consumer and resource species may have important implications for interaction strengths, population dynamics, and eventually food web structure, function, and evolution. Still, the general distribution of consumer-'resource body-size ratios in real ecosystems, and whether they vary systematically among habitats or broad taxonomic groups, is poorly understood. Using a unique global database on consumer and resource body sizes, we show that the mean body-size ratios of aquatic herbivorous and detritivorous consumers are several orders of magnitude larger than those of carnivorous predators. Carnivorous predator-prey body-size ratios vary across different habitats and predator and prey types (invertebrates, ectotherm, and endotherm vertebrates). Predator-prey body-size ratios are on average significantly higher (1) in freshwater habitats than in marine or terrestrial habitats, (2) for vertebrate than for invertebrate predators, and (3) for invertebrate than for ectotherm vertebrate prey. If recent studies that relate body-size ratios to interaction strengths are general, our results suggest that mean consumer-resource interaction strengths may vary systematically across different habitat categories and consumer types.
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- 2006
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