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  • 1
    Monograph available for loan
    Monograph available for loan
    Princeton [u.a.] : Princeton University Press
    Call number: PIK B 020-10-0067
    Description / Table of Contents: Contents: Chapter 1: Basic Analysis of Forward-Looking Decision Making ; 1.1 The Dynamic Program ; 1.2 Approximation ; 1.3 Stationary Case ; 1.4 Markov Representation ; 1.5 Distribution of the Stochastic Driving Force ; Chapter 2: Research on Properties of Preferences ; 2.1 Research Based on Marshallian and Hicksian Labor Supply Functions ; 2.2 Risk Aversion ; 2.3 Intertemporal Substitution ; 2.4 Frisch Elasticity of Labor Supply ; 2.5 Consumption-Hours Complementarity ; Chapter 3: Health ; 3.1 The Issues ; 3.2 Basic Facts ; 3.3 Basic Model ; 3.4 The Full Dynamic-Programming Model ; 3.5 The Health Production Function ; 3.6 Preference Parameters ; 3.7 Solving the Model ; 3.8 Concluding Remarks ; Chapter 4: Insurance ; 4.1 The Model ; 4.2 Calibration ; 4.3 Results ; Chapter 5: Employment ; 5.1 Insurance ; 5.2 Dynamic Labor-Market Equilibrium ; 5.3 The Employment Function ; 5.4 Econometric Model ; 5.5 Properties of the Data ; 5.6 Results ; 5.7 Concluding Remarks ; Chapter 6: Idiosyncratic Risk ; 6.1 The Joint Distribution of Lifetime and Exit Value ; 6.2 Economic Payoffs to Entrepreneurs ; 6.3 Entrepreneurs in Aging Companies ; 6.4 Concluding Remarks ; Chapter 7: Financial Stability with Government-Guaranteed Debt ; 7.1 Introduction ; 7.2 Options ; 7.3 Model ; 7.4 Calibration ; 7.5 Equilibrium ; 7.6 Roles of Key Parameters ; 7.7 Concluding Remarks ; 7.8 Appendix: Value Functions ; References ; Index
    Type of Medium: Monograph available for loan
    Pages: XIII, 126 S. : graph. Darst.
    ISBN: 9780691142425
    Series Statement: The Gorman lectures in economics
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 2
    Call number: 9/M 07.0421(355)
    In: Geological Society special publication
    Type of Medium: Monograph available for loan
    Pages: 381 S. : z.T. farb. Ill. und graph. Darst.
    ISBN: 9781862393295
    Series Statement: Geological Society special publication 355
    Classification:
    Tectonics
    Location: Reading room
    Branch Library: GFZ Library
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  • 3
    Monograph available for loan
    Monograph available for loan
    London : The Geological Society
    Associated volumes
    Call number: 9/M 97.0293
    In: Geological Society special publication
    Description / Table of Contents: SE Asia is probably the finest natural geological laboratory in the world, yet is still not geologically well known. It is a spectacular region in which the manifestations and processes of plate collision can be observed at present and in which their history is recorded. It is a region that must be understood if we are to understand mountain belts, arc development marginal basin evolution and, more generally, the behaviour of the lithosphere in collision settings. Furthermore, the region is developing rapidly on the economic front, and a major part of this rapid development is built on natural resources. The geological reasons for the distribution of these resources are therefore of major importance for the inhabitants of the region and for any attempts to discover and exploit them. The volume will be of interest to all geologists working in SE Asia, particularly those involved in the petroleum industry.
    Type of Medium: Monograph available for loan
    Pages: XIII, 566 S. , Ill., graph. Darst., Kt.
    ISBN: 1897799527
    Series Statement: Geological Society special publication 106
    Classification:
    Regional Geology
    Language: English
    Note: Robert Hall, D. J. Blundell, and Robert Hall: Tectonic evolution of SE Asia: introduction / Geological Society, London, Special Publications, 106:vii-xiii, doi:10.1144/GSL.SP.1996.106.01.01 --- Part 1: Present-day Tectonics --- Robert McCaffrey: Slip partitioning at convergent plate boundaries of SE Asia / Geological Society, London, Special Publications, 106:3-18, doi:10.1144/GSL.SP.1996.106.01.02 --- Jacques André Malod and Badrul Mustafa Kemal: The Sumatra margin: oblique subduction and lateral displacement of the accretionary prism / Geological Society, London, Special Publications, 106:19-28, doi:10.1144/GSL.SP.1996.106.01.03 --- Claude Rangin, Daharta Dahrin, Ray Quebral, and The Modec Scientific Party: Collision and strike-slip faulting in the northern Molucca Sea (Philippines and Indonesia): preliminary results of a morphotectonic study / Geological Society, London, Special Publications, 106:29-46, doi:10.1144/GSL.SP.1996.106.01.04 --- A. N. Richardson, D. J. Blundell, and A. N. Richardson: Continental collision in the Banda arc / Geological Society, London, Special Publications, 106:47-60, doi:10.1144/GSL.SP.1996.106.01.05 --- David B. Snyder, John Milsom, and Hardi Prasetyo: Geophysical evidence for local indentor tectonics in the Banda arc east of Timor / Geological Society, London, Special Publications, 106:61-73, doi:10.1144/GSL.SP.1996.106.01.06 --- B. D. Hughes, K. Baxter, R. A. Clark, and D. B. Snyder: Detailed processing of seismic reflection data from the frontal part of the Timor trough accretionary wedge, eastern Indonesia / Geological Society, London, Special Publications, 106:75-83, doi:10.1144/GSL.SP.1996.106.01.07 --- John Milsom, Steve Kaye, and Sardjono: Extension, collision and curvature in the eastern Banda arc / Geological Society, London, Special Publications, 106:85-94, doi:10.1144/GSL.SP.1996.106.01.08 --- Part 2: Tectonic Development of Southeast Asia --- I. Metcalfe: Pre-Cretaceous evolution of SE Asian terranes / Geological Society, London, Special Publications, 106:97-122, doi:10.1144/GSL.SP.1996.106.01.09 --- Gordon Packham: Cenozoic SE Asia: reconstructing its aggregation and reorganization / Geological Society, London, Special Publications, 106:123-152, doi:10.1144/GSL.SP.1996.106.01.10 --- Robert Hall: Reconstructing Cenozoic SE Asia / Geological Society, London, Special Publications, 106:153-184, doi:10.1144/GSL.SP.1996.106.01.11 --- T. O. Simandjuntak and A. J. Barber: Contrasting tectonic styles in the Neogene orogenic belts of Indonesia / Geological Society, London, Special Publications, 106:185-201, doi:10.1144/GSL.SP.1996.106.01.12 --- Bryan Richter and Michael Fuller: Palaeomagnetism of the Sibumasu and Indochina blocks: implications for the extrusion tectonic model / Geological Society, London, Special Publications, 106:203-224, doi:10.1144/GSL.SP.1996.106.01.13 --- Robert B. Stokes, Paul F. Lovatt Smith, and Ko Soumphonphakdy: Timing of the Shan-Thai-Indochina collision: new evidence from the Pak Lay Foldbelt of the Lao PDR / Geological Society, London, Special Publications, 106:225-232, doi:10.1144/GSL.SP.1996.106.01.14 --- Paul F. Lovatt Smith, Robert B. Stokes, Charlie Bristow, and Andrew Carter: Mid-Cretaceous inversion in the Northern Khorat Plateau of Lao PDR and Thailand / Geological Society, London, Special Publications, 106:233-247, doi:10.1144/GSL.SP.1996.106.01.15 --- Charles S. Hutchison: The ‘Rajang accretionary prism’ and ‘Lupar Line’ problem of Borneo / Geological Society, London, Special Publications, 106:247-261, doi:10.1144/GSL.SP.1996.106.01.16 --- Shariff A. K. Omang and A. J. Barber: Origin and tectonic significance of the metamorphic rocks associated with the Darvel Bay Ophiolite, Sabah, Malaysia / Geological Society, London, Special Publications, 106:263-279, doi:10.1144/GSL.SP.1996.106.01.17 --- Khalid Ngah, Mazlan Madon, and H. D. Tjia: Role of pre-Tertiary fractures in formation and development of the Malay and Penyu basins / Geological Society, London, Special Publications, 106:281-289, doi:10.1144/GSL.SP.1996.106.01.18 --- H. D. Tjia and K. K. Liew: Changes in tectonic stress field in northern Sunda Shelf basins / Geological Society, London, Special Publications, 106:291-306, doi:10.1144/GSL.SP.1996.106.01.19 --- Ben Clennell: Far-field and gravity tectonics in Miocene basins of Sabah, Malaysia / Geological Society, London, Special Publications, 106:307-320, doi:10.1144/GSL.SP.1996.106.01.20 --- W. J. McCourt, M. J. Crow, E. J. Cobbing, and T. C. Amin: Mesozoic and Cenozoic plutonic evolution of SE Asia: evidence from Sumatra, Indonesia / Geological Society, London, Special Publications, 106:321-335, doi:10.1144/GSL.SP.1996.106.01.21 --- M. A. Samuel and N. A. Harbury: The Mentawai fault zone and deformation of the Sumatran Forearc in the Nias area / Geological Society, London, Special Publications, 106:337-351, doi:10.1144/GSL.SP.1996.106.01.22 --- Koji Wakita, Jan Sopaheluwakan, Kazuhiro Miyazaki, Iskandar Zulkarnain, and Munasri: Tectonic evolution of the Bantimala Complex, South Sulawesi, Indonesia / Geological Society, London, Special Publications, 106:353-364, doi:10.1144/GSL.SP.1996.106.01.23 --- Moyra E. J. Wilson and Dan W. J. Bosence: The Tertiary evolution of South Sulawesi: a record in redeposited carbonates of the Tonasa Limestone Formation / Geological Society, London, Special Publications, 106:365-389, doi:10.1144/GSL.SP.1996.106.01.24 --- Steven C. Bergman, Dana Q. Coffield, James P. Talbot, and Richard A. Garrard: Tertiary Tectonic and magmatic evolution of western Sulawesi and the Makassar Strait, Indonesia: evidence for a Miocene continent-continent collision / Geological Society, London, Special Publications, 106:391-429, doi:10.1144/GSL.SP.1996.106.01.25 --- Jason R. Ali, John Milsom, Edward M. Finch, and Bundan Mubroto: SE Sundaland accretion: palaeomagnetic evidence of large Plio-Pleistocene thin-skin rotations in Buton / Geological Society, London, Special Publications, 106:431-443, doi:10.1144/GSL.SP.1996.106.01.26 --- P Z. Vroon, M. J. Van Bergen, and E. J. Forde: Pb and Nd isotope constraints on the provenance of tectonically dispersed continental fragments in east Indonesia / Geological Society, London, Special Publications, 106:445-453, doi:10.1144/GSL.SP.1996.106.01.27 --- Kees Linthout, Henk Helmers, Jan R. Wijbrans, and Jan Diederik A. M. Van Wees: 40Ar/39Ar constraints on obduction of the Seram ultramafic complex: consequences for the evolution of the southern Banda Sea / Geological Society, London, Special Publications, 106:455-464, doi:10.1144/GSL.SP.1996.106.01.28 --- Tim R. Charlton: Correlation of the Salawati and Tomori Basins, eastern Indonesia: a constraint on left-lateral displacements of the Sorong fault zone / Geological Society, London, Special Publications, 106:465-481, doi:10.1144/GSL.SP.1996.106.01.29 --- Jeffrey F. A. Malaihollo and Robert Hall: The geology and tectonic evolution of the Bacan region, east Indonesia / Geological Society, London, Special Publications, 106:483-497, doi:10.1144/GSL.SP.1996.106.01.30 --- Simon Baker and Jeffrey Malaihollo: Dating of Neogene igneous rocks in the Halmahera region: arc initiation and development / Geological Society, London, Special Publications, 106:499-509, doi:10.1144/GSL.SP.1996.106.01.31 --- M. Pubellier, R. Quebral, M. Aurelio, and C. Rangin: Docking and post-docking escape tectonics in the southern Philippines / Geological Society, London, Special Publications, 106:511-523, doi:10.1144/GSL.SP.1996.106.01.32 --- P. V. Crowhurst, K. C. Hill, D. A. Foster, and A. P. Bennett: Thermochronological and geochemical constraints on the tectonic evolution of northern Papua New Guinea / Geological Society, London, Special Publications, 106:525-537, doi:10.1144/GSL.SP.1996.106.01.33 --- Helmut Wopfner: Gondwana origin of the Baoshan and Tengchong terranes of west Yunnan / Geological Society, London, Special Publications, 106:539-547, doi:10.1144/GSL.SP.19
    Location: Reading room
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  • 4
    Call number: SR 90.0001(1385-C)
    In: U.S. Geological Survey bulletin
    Type of Medium: Series available for loan
    Pages: VI, C-29 S. + 12 pl.
    Series Statement: U.S. Geological Survey bulletin 1385-C
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 5
    Series available for loan
    Series available for loan
    Washington, DC : United States Gov. Print. Off.
    Associated volumes
    Call number: SR 90.0002(1076-A)
    In: Professional paper
    Type of Medium: Series available for loan
    Pages: VI, A-35 S.
    Series Statement: U.S. Geological Survey professional paper 1076-A
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 6
    Description / Table of Contents: Collision between Australia and SE Asia began in the Early Miocene and reduced the former wide ocean between them to a complex passage which connects the Pacific and Indian Oceans. Today, the Indonesian Throughflow passes through this gateway and plays an important role in global thermohaline flow. The surrounding region contains the maximum global diversity for many marine and terrestrial organisms. Reconstruction of this geologically complex region is essential for understanding its role in oceanic and atmospheric circulation, climate impacts, and the origin of its biodiversity. The papers in this volume discuss the Palaeozoic to Cenozoic geological background to Australia and SE Asia collision. They provide the background for accounts of the modern Indonesian Throughflow and oceanographic changes since the Neogene, and consider aspects of the region's climate history.
    Pages: Online-Ressource (381 Seiten)
    ISBN: 9781862393295
    Language: English
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  • 7
    Keywords: Südostasien ; Tektonik ; Geology, Structural ; Asia, Southeastern ; Plate tectonics
    Description / Table of Contents: Robert Hall, D. J. Blundell, and Robert Hall: Tectonic evolution of SE Asia: introduction / Geological Society, London, Special Publications, 106:vii-xiii, doi:10.1144/GSL.SP.1996.106.01.01 --- Part 1: Present-day Tectonics --- Robert McCaffrey: Slip partitioning at convergent plate boundaries of SE Asia / Geological Society, London, Special Publications, 106:3-18, doi:10.1144/GSL.SP.1996.106.01.02 --- Jacques André Malod and Badrul Mustafa Kemal: The Sumatra margin: oblique subduction and lateral displacement of the accretionary prism / Geological Society, London, Special Publications, 106:19-28, doi:10.1144/GSL.SP.1996.106.01.03 --- Claude Rangin, Daharta Dahrin, Ray Quebral, and The Modec Scientific Party: Collision and strike-slip faulting in the northern Molucca Sea (Philippines and Indonesia): preliminary results of a morphotectonic study / Geological Society, London, Special Publications, 106:29-46, doi:10.1144/GSL.SP.1996.106.01.04 --- A. N. Richardson, D. J. Blundell, and A. N. Richardson: Continental collision in the Banda arc / Geological Society, London, Special Publications, 106:47-60, doi:10.1144/GSL.SP.1996.106.01.05 --- David B. Snyder, John Milsom, and Hardi Prasetyo: Geophysical evidence for local indentor tectonics in the Banda arc east of Timor / Geological Society, London, Special Publications, 106:61-73, doi:10.1144/GSL.SP.1996.106.01.06 --- B. D. Hughes, K. Baxter, R. A. Clark, and D. B. Snyder: Detailed processing of seismic reflection data from the frontal part of the Timor trough accretionary wedge, eastern Indonesia / Geological Society, London, Special Publications, 106:75-83, doi:10.1144/GSL.SP.1996.106.01.07 --- John Milsom, Steve Kaye, and Sardjono: Extension, collision and curvature in the eastern Banda arc / Geological Society, London, Special Publications, 106:85-94, doi:10.1144/GSL.SP.1996.106.01.08 --- Part 2: Tectonic Development of Southeast Asia --- I. Metcalfe: Pre-Cretaceous evolution of SE Asian terranes / Geological Society, London, Special Publications, 106:97-122, doi:10.1144/GSL.SP.1996.106.01.09 --- Gordon Packham: Cenozoic SE Asia: reconstructing its aggregation and reorganization / Geological Society, London, Special Publications, 106:123-152, doi:10.1144/GSL.SP.1996.106.01.10 --- Robert Hall: Reconstructing Cenozoic SE Asia / Geological Society, London, Special Publications, 106:153-184, doi:10.1144/GSL.SP.1996.106.01.11 --- T. O. Simandjuntak and A. J. Barber: Contrasting tectonic styles in the Neogene orogenic belts of Indonesia / Geological Society, London, Special Publications, 106:185-201, doi:10.1144/GSL.SP.1996.106.01.12 --- Bryan Richter and Michael Fuller: Palaeomagnetism of the Sibumasu and Indochina blocks: implications for the extrusion tectonic model / Geological Society, London, Special Publications, 106:203-224, doi:10.1144/GSL.SP.1996.106.01.13 --- Robert B. Stokes, Paul F. Lovatt Smith, and Ko Soumphonphakdy: Timing of the Shan-Thai-Indochina collision: new evidence from the Pak Lay Foldbelt of the Lao PDR / Geological Society, London, Special Publications, 106:225-232, doi:10.1144/GSL.SP.1996.106.01.14 --- Paul F. Lovatt Smith, Robert B. Stokes, Charlie Bristow, and Andrew Carter: Mid-Cretaceous inversion in the Northern Khorat Plateau of Lao PDR and Thailand / Geological Society, London, Special Publications, 106:233-247, doi:10.1144/GSL.SP.1996.106.01.15 --- Charles S. Hutchison: The ‘Rajang accretionary prism’ and ‘Lupar Line’ problem of Borneo / Geological Society, London, Special Publications, 106:247-261, doi:10.1144/GSL.SP.1996.106.01.16 --- Shariff A. K. Omang and A. J. Barber: Origin and tectonic significance of the metamorphic rocks associated with the Darvel Bay Ophiolite, Sabah, Malaysia / Geological Society, London, Special Publications, 106:263-279, doi:10.1144/GSL.SP.1996.106.01.17 --- Khalid Ngah, Mazlan Madon, and H. D. Tjia: Role of pre-Tertiary fractures in formation and development of the Malay and Penyu basins / Geological Society, London, Special Publications, 106:281-289, doi:10.1144/GSL.SP.1996.106.01.18 --- H. D. Tjia and K. K. Liew: Changes in tectonic stress field in northern Sunda Shelf basins / Geological Society, London, Special Publications, 106:291-306, doi:10.1144/GSL.SP.1996.106.01.19 --- Ben Clennell: Far-field and gravity tectonics in Miocene basins of Sabah, Malaysia / Geological Society, London, Special Publications, 106:307-320, doi:10.1144/GSL.SP.1996.106.01.20 --- W. J. McCourt, M. J. Crow, E. J. Cobbing, and T. C. Amin: Mesozoic and Cenozoic plutonic evolution of SE Asia: evidence from Sumatra, Indonesia / Geological Society, London, Special Publications, 106:321-335, doi:10.1144/GSL.SP.1996.106.01.21 --- M. A. Samuel and N. A. Harbury: The Mentawai fault zone and deformation of the Sumatran Forearc in the Nias area / Geological Society, London, Special Publications, 106:337-351, doi:10.1144/GSL.SP.1996.106.01.22 --- Koji Wakita, Jan Sopaheluwakan, Kazuhiro Miyazaki, Iskandar Zulkarnain, and Munasri: Tectonic evolution of the Bantimala Complex, South Sulawesi, Indonesia / Geological Society, London, Special Publications, 106:353-364, doi:10.1144/GSL.SP.1996.106.01.23 --- Moyra E. J. Wilson and Dan W. J. Bosence: The Tertiary evolution of South Sulawesi: a record in redeposited carbonates of the Tonasa Limestone Formation / Geological Society, London, Special Publications, 106:365-389, doi:10.1144/GSL.SP.1996.106.01.24 --- Steven C. Bergman, Dana Q. Coffield, James P. Talbot, and Richard A. Garrard: Tertiary Tectonic and magmatic evolution of western Sulawesi and the Makassar Strait, Indonesia: evidence for a Miocene continent-continent collision / Geological Society, London, Special Publications, 106:391-429, doi:10.1144/GSL.SP.1996.106.01.25 --- Jason R. Ali, John Milsom, Edward M. Finch, and Bundan Mubroto: SE Sundaland accretion: palaeomagnetic evidence of large Plio-Pleistocene thin-skin rotations in Buton / Geological Society, London, Special Publications, 106:431-443, doi:10.1144/GSL.SP.1996.106.01.26 --- P Z. Vroon, M. J. Van Bergen, and E. J. Forde: Pb and Nd isotope constraints on the provenance of tectonically dispersed continental fragments in east Indonesia / Geological Society, London, Special Publications, 106:445-453, doi:10.1144/GSL.SP.1996.106.01.27 --- Kees Linthout, Henk Helmers, Jan R. Wijbrans, and Jan Diederik A. M. Van Wees: 40Ar/39Ar constraints on obduction of the Seram ultramafic complex: consequences for the evolution of the southern Banda Sea / Geological Society, London, Special Publications, 106:455-464, doi:10.1144/GSL.SP.1996.106.01.28 --- Tim R. Charlton: Correlation of the Salawati and Tomori Basins, eastern Indonesia: a constraint on left-lateral displacements of the Sorong fault zone / Geological Society, London, Special Publications, 106:465-481, doi:10.1144/GSL.SP.1996.106.01.29 --- Jeffrey F. A. Malaihollo and Robert Hall: The geology and tectonic evolution of the Bacan region, east Indonesia / Geological Society, London, Special Publications, 106:483-497, doi:10.1144/GSL.SP.1996.106.01.30 --- Simon Baker and Jeffrey Malaihollo: Dating of Neogene igneous rocks in the Halmahera region: arc initiation and development / Geological Society, London, Special Publications, 106:499-509, doi:10.1144/GSL.SP.1996.106.01.31 --- M. Pubellier, R. Quebral, M. Aurelio, and C. Rangin: Docking and post-docking escape tectonics in the southern Philippines / Geological Society, London, Special Publications, 106:511-523, doi:10.1144/GSL.SP.1996.106.01.32 --- P. V. Crowhurst, K. C. Hill, D. A. Foster, and A. P. Bennett: Thermochronological and geochemical constraints on the tectonic evolution of northern Papua New Guinea / Geological Society, London, Special Publications, 106:525-537, doi:10.1144/GSL.SP.1996.106.01.33 --- Helmut Wopfner: Gondwana origin of the Baoshan and Tengchong terranes of west Yunnan / Geological Society, London, Special Publications, 106:539-547, doi:10.1144/GSL.SP.1996.106.01.34 --- Zuyi Zhou, Qiuyuan Lao, Huanjiang Chen, Sijiang Ding, and Zhongting Liao: Early Mesozoic orogeny in Fujian, southeast China / Geological Society, London, Special Publications, 106:549-556, doi:10.1144/GSL.SP.1996.106.01.35
    Pages: Online-Ressource (XIII, 566 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1897799527
    Language: English
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  • 8
    Publication Date: 1996-01-01
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
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  • 9
    Publication Date: 2022-05-25
    Description: Author Posting. © Association for the Sciences of Limnology and Oceanography, 2013. This article is posted here by permission of Association for the Sciences of Limnology and Oceanography for personal use, not for redistribution. The definitive version was published in Limnology and Oceanography 58 (2013): 1271-1285, doi:10.4319/lo.2013.58.4.1271.
    Description: Most nitrogen (N) assimilation in lake and marine ecosystems is often subsequently released via autochthonous dissolved organic nitrogen (DON) production, but autochthonous DON production has yet to be quantified in flowing waters. We measured in-stream DON production following 24 h 15N-nitrate () tracer additions in 36 headwater streams, a subset of sites from the second Lotic Intersite Nitrogen eXperiment. Streams were located in five North American ecoregions and drained basins dominated by native vegetation, agriculture, or urban land use. Using a two-compartment model, we could quantify DON production in 15 streams as a function of DO15N derived from 15N tracer in biomass compartments. The streams with detectable DON production had higher % modified land use (agriculture + urban) in their basins than did streams with undetectable DON production. Median DON production represented 8% of total uptake when we used N biomass estimates based on N assimilated over 1 d (measured directly from the 15N additions). Median DON production was 17% of total uptake when we used N assimilated over 42 d (extrapolated from previous 15N tracer studies). Variation in DON production was positively correlated with ecosystem respiration, indicating that stream heterotrophy may influence DON production. In-stream DON production was similar in magnitude to stream denitrification and nitrification, indicating that the production of autochthonous DON can represent a substantial transformation of stream N. Our results confirm that headwater streams can quickly convert inorganic N into organic forms, although the ultimate fate of DON remains unclear.
    Description: This work was supported by a grant from the National Science Foundation Division of Environmental Biology (NSF DEB-0111410), and L. Johnson was partially supported by fellowships from the Center for Aquatic Conservation at the University of Notre Dame and the Bayer Corporation while preparing this manuscript.
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 10
    Publication Date: 2022-05-26
    Description: Author Posting. © The Author(s), 2008. This is the author's version of the work. It is posted here by permission of Nature Publishing Group for personal use, not for redistribution. The definitive version was published in Nature 452 (2008): 202-205, doi:10.1038/nature06686.
    Description: Worldwide, anthropogenic addition of bioavailable nitrogen (N) to the biosphere is increasing and terrestrial ecosystems are becoming increasingly N saturated, causing more bioavailable N to enter groundwater and surface waters. Large-scale N budgets show that an average of about 20-25% of the N added to the biosphere is exported from rivers to the ocean or inland basins, indicating substantial sinks for N must exist in the landscape. Streams and rivers may be important sinks for bioavailable N owing to their hydrologic connections with terrestrial systems, high rates of biological activity, and streambed sediment environments that favor microbial denitrification. Here, using data from 15N tracer experiments replicated across 72 streams and 8 regions representing several biomes, we show that total biotic uptake and denitrification of nitrate increase with stream nitrate concentration, but that the efficiency of biotic uptake and denitrification declines as concentration increases, reducing the proportion of instream nitrate that is removed from transport. Total uptake of nitrate was related to ecosystem photosynthesis and denitrification was related to ecosystem respiration. Additionally, we use a stream network model to demonstrate that excess nitrate in streams elicits a disproportionate increase in the fraction of nitrate that is exported to receiving waters and reduces the relative role of small versus large streams as nitrate sinks.
    Description: Funding for this research was provided by the National Science Foundation.
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
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