1
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Kiemel K, Gurke M, Paraskevopoulou S, Havenstein K, Weithoff G, Tiedemann R. Variation in heat shock protein 40 kDa relates to divergence in thermotolerance among cryptic rotifer species. Sci Rep 2022; 12:22626. [PMID: 36587065 PMCID: PMC9805463 DOI: 10.1038/s41598-022-27137-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 12/26/2022] [Indexed: 01/01/2023] Open
Abstract
Genetic divergence and the frequency of hybridization are central for defining species delimitations, especially among cryptic species where morphological differences are merely absent. Rotifers are known for their high cryptic diversity and therefore are ideal model organisms to investigate such patterns. Here, we used the recently resolved Brachionus calyciflorus species complex to investigate whether previously observed between species differences in thermotolerance and gene expression are also reflected in their genomic footprint. We identified a Heat Shock Protein gene (HSP 40 kDa) which exhibits cross species pronounced sequence variation. This gene exhibits species-specific fixed sites, alleles, and sites putatively under positive selection. These sites are located in protein binding regions involved in chaperoning and may therefore reflect adaptive diversification. By comparing three genetic markers (ITS, COI, HSP 40 kDa), we revealed hybridization events between the cryptic species. The low frequency of introgressive haplotypes/alleles suggest a tight, but not fully impermeable boundary between the cryptic species.
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Affiliation(s)
- K. Kiemel
- grid.11348.3f0000 0001 0942 1117Unit of Evolutionary Biology/Systematic Zoology, Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht Straße 24-25, 14476 Potsdam, Germany
| | - M. Gurke
- grid.422371.10000 0001 2293 9957Museum für Naturkunde – Leibniz Institute for Evolution and Biodiversity Science, Invalidenstraße 43, 10115 Berlin, Germany ,grid.7468.d0000 0001 2248 7639Department of Biology, Humboldt-University, Invalidenstraße 42, 10115 Berlin, Germany
| | - S. Paraskevopoulou
- grid.4514.40000 0001 0930 2361Department of Biology, Lund University, Microbiology Group, Sölvegatan 35, 223 62 Lund, Sweden
| | - K. Havenstein
- grid.11348.3f0000 0001 0942 1117Unit of Evolutionary Biology/Systematic Zoology, Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht Straße 24-25, 14476 Potsdam, Germany
| | - G. Weithoff
- grid.11348.3f0000 0001 0942 1117Unit of Ecology and Ecosystem Modelling, Institute for Biochemistry and Biology, University of Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany
| | - R. Tiedemann
- grid.11348.3f0000 0001 0942 1117Unit of Evolutionary Biology/Systematic Zoology, Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht Straße 24-25, 14476 Potsdam, Germany
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2
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Kiemel K, De Cahsan B, Paraskevopoulou S, Weithoff G, Tiedemann R. Mitochondrial genomes of the freshwater monogonont rotifer Brachionus fernandoi and of two additional B. calyciflorus sensu stricto lineages from Germany and the USA (Rotifera, Brachionidae). Mitochondrial DNA B Resour 2022; 7:646-648. [PMID: 35478860 PMCID: PMC9037189 DOI: 10.1080/23802359.2022.2060765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Affiliation(s)
- K. Kiemel
- Unit of Evolutionary Biology/Systematic Zoology, Institute for Biochemistry and Biology, University of Potsdam, Potsdam, Germany
| | - B. De Cahsan
- GLOBE Institute, University of Copenhagen, Copenhagen, Denmark
| | - S. Paraskevopoulou
- School of Zoology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - G. Weithoff
- Unit of Ecology and Ecosystem Modelling, Institute for Biochemistry and Biology, University of Potsdam, Potsdam, Germany
| | - R. Tiedemann
- Unit of Evolutionary Biology/Systematic Zoology, Institute for Biochemistry and Biology, University of Potsdam, Potsdam, Germany
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3
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Gong X, Lembke-Jene L, Lohmann G, Knorr G, Tiedemann R, Zou JJ, Shi XF. Enhanced North Pacific deep-ocean stratification by stronger intermediate water formation during Heinrich Stadial 1. Nat Commun 2019; 10:656. [PMID: 30737377 PMCID: PMC6368553 DOI: 10.1038/s41467-019-08606-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Accepted: 01/22/2019] [Indexed: 11/09/2022] Open
Abstract
The deglacial history of CO2 release from the deep North Pacific remains unresolved. This is due to conflicting indications about subarctic Pacific ventilation changes based on various marine proxies, especially for Heinrich Stadial 1 (HS-1) when a rapid atmospheric CO2 rise occurs. Here, we use a complex Earth System Model to investigate the deglacial North Pacific overturning and its control on ocean stratification. Our results show an enhanced intermediate-to-deep ocean stratification coeval with intensified North Pacific Intermediate Water (NPIW) formation during HS-1, compared to the Last Glacial Maximum. The stronger NPIW formation causes lower salinities and higher temperatures at intermediate depths. By lowering NPIW densities, this enlarges vertical density gradient and thus enhances intermediate-to-deep ocean stratification during HS-1. Physically, this process prevents the North Pacific deep waters from a better communication with the upper oceans, thus prolongs the existing isolation of glacial Pacific abyssal carbons during HS-1.
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Affiliation(s)
- X Gong
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bussestr. 24, 27570, Bremerhaven, Germany.
| | - L Lembke-Jene
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bussestr. 24, 27570, Bremerhaven, Germany
| | - G Lohmann
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bussestr. 24, 27570, Bremerhaven, Germany.,MARUM-Center for Marine Environmental Sciences, University Bremen, Leobener Strasse, 28359, Bremen, Germany
| | - G Knorr
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bussestr. 24, 27570, Bremerhaven, Germany
| | - R Tiedemann
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bussestr. 24, 27570, Bremerhaven, Germany
| | - J J Zou
- Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266061, China.,Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, 266061, China
| | - X F Shi
- Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266061, China.,Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, 266061, China
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4
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Maier E, Zhang X, Abelmann A, Gersonde R, Mulitza S, Werner M, Méheust M, Ren J, Chapligin B, Meyer H, Stein R, Tiedemann R, Lohmann G. North Pacific freshwater events linked to changes in glacial ocean circulation. Nature 2018; 559:241-245. [PMID: 29995862 DOI: 10.1038/s41586-018-0276-y] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Accepted: 05/14/2018] [Indexed: 11/09/2022]
Abstract
There is compelling evidence that episodic deposition of large volumes of freshwater into the oceans strongly influenced global ocean circulation and climate variability during glacial periods1,2. In the North Atlantic region, episodes of massive freshwater discharge to the North Atlantic Ocean were related to distinct cold periods known as Heinrich Stadials1-3. By contrast, the freshwater history of the North Pacific region remains unclear, giving rise to persistent debates about the existence and possible magnitude of climate links between the North Pacific and North Atlantic oceans during Heinrich Stadials4,5. Here we find that there was a strong connection between changes in North Atlantic circulation during Heinrich Stadials and injections of freshwater from the North American Cordilleran Ice Sheet to the northeastern North Pacific. Our record of diatom δ18O (a measure of the ratio of the stable oxygen isotopes 18O and 16O) over the past 50,000 years shows a decrease in surface seawater δ18O of two to three per thousand, corresponding to a decline in salinity of roughly two to four practical salinity units. This coincided with enhanced deposition of ice-rafted debris and a slight cooling of the sea surface in the northeastern North Pacific during Heinrich Stadials 1 and 4, but not during Heinrich Stadial 3. Furthermore, results from our isotope-enabled model6 suggest that warming of the eastern Equatorial Pacific during Heinrich Stadials was crucial for transmitting the North Atlantic signal to the northeastern North Pacific, where the associated subsurface warming resulted in a discernible freshwater discharge from the Cordilleran Ice Sheet during Heinrich Stadials 1 and 4. However, enhanced background cooling across the northern high latitudes during Heinrich Stadial 3-the coldest period in the past 50,000 years7-prevented subsurface warming of the northeastern North Pacific and thus increased freshwater discharge from the Cordilleran Ice Sheet. In combination, our results show that nonlinear ocean-atmosphere background interactions played a complex role in the dynamics linking the freshwater discharge responses of the North Atlantic and North Pacific during glacial periods.
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Affiliation(s)
- E Maier
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany.
| | - X Zhang
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany.
| | - A Abelmann
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
| | - R Gersonde
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
| | - S Mulitza
- MARUM-Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany
| | - M Werner
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
| | - M Méheust
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
| | - J Ren
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
| | - B Chapligin
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany
| | - H Meyer
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany
| | - R Stein
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
| | - R Tiedemann
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
| | - G Lohmann
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
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5
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Ronge TA, Tiedemann R, Lamy F, Köhler P, Alloway BV, De Pol-Holz R, Pahnke K, Southon J, Wacker L. Radiocarbon constraints on the extent and evolution of the South Pacific glacial carbon pool. Nat Commun 2016; 7:11487. [PMID: 27157845 PMCID: PMC4865812 DOI: 10.1038/ncomms11487] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Accepted: 04/01/2016] [Indexed: 11/09/2022] Open
Abstract
During the last deglaciation, the opposing patterns of atmospheric CO2 and radiocarbon activities (Δ(14)C) suggest the release of (14)C-depleted CO2 from old carbon reservoirs. Although evidences point to the deep Pacific as a major reservoir of this (14)C-depleted carbon, its extent and evolution still need to be constrained. Here we use sediment cores retrieved along a South Pacific transect to reconstruct the spatio-temporal evolution of Δ(14)C over the last 30,000 years. In ∼2,500-3,600 m water depth, we find (14)C-depleted deep waters with a maximum glacial offset to atmospheric (14)C (ΔΔ(14)C=-1,000‰). Using a box model, we test the hypothesis that these low values might have been caused by an interaction of aging and hydrothermal CO2 influx. We observe a rejuvenation of circumpolar deep waters synchronous and potentially contributing to the initial deglacial rise in atmospheric CO2. These findings constrain parts of the glacial carbon pool to the deep South Pacific.
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Affiliation(s)
- T A Ronge
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Department for Marine Geology, PO Box 120161, Bremerhaven 27515, Germany
| | - R Tiedemann
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Department for Marine Geology, PO Box 120161, Bremerhaven 27515, Germany
| | - F Lamy
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Department for Marine Geology, PO Box 120161, Bremerhaven 27515, Germany
| | - P Köhler
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Department for Marine Geology, PO Box 120161, Bremerhaven 27515, Germany
| | - B V Alloway
- School of Geography, Environment and Earth Sciences, Victoria University of Wellington, PO Box 600, 6012 Wellington, New Zealand
| | - R De Pol-Holz
- GAIA-Antartica, Universidad de Magallanes, Punta Arenas 01855, Chile
| | - K Pahnke
- Max Planck Research Group-Marine Isotope Geochemistry, Institute for Chemistry and Biology of the Marine Environment, Department of Marine Isotope Geochemistry, Carl von Ossietzky University, PO Box 2503, Oldenburg 26111, Germany
| | - J Southon
- School of Physical Science, Department of Earth Science, University of California, Irvine, California 92697-4675, USA
| | - L Wacker
- Laboratory of Ion Beam Physics (HPK), Eidgenössische Technische Hochschule, Schafmattstrasse 20, Zürich 8093, Switzerland
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6
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Areethamsirikul N, Masih-Khan E, Chu CM, Jimenez-Zepeda V, Reece DE, Trudel S, Kukreti V, Tiedemann R, Chen C. CyBorD induction therapy in clinical practice. Bone Marrow Transplant 2015; 50:375-9. [PMID: 25599165 DOI: 10.1038/bmt.2014.288] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Revised: 10/09/2014] [Accepted: 10/15/2014] [Indexed: 11/09/2022]
Abstract
Cyclophosphamide, bortezomib and dexamethasone (CyBorD) is a highly active three-drug induction regimen for untreated transplant-eligible multiple myeloma patients. Although CyBorD has been evaluated only in the phase 2 setting in a limited number of patients, its high efficacy and ease of administration have led to its widespread use. Given that clinical trial efficacy can overestimate real-life effectiveness, we reviewed our institutional experience with 109 newly diagnosed patients who were treated with CyBorD in a non-clinical trial setting. After a median of four cycles, overall response rate (ORR) and very good partial response rate or better (⩾VGPR) were 95 and 66%, respectively, comparable to phase 2 studies of CyBorD and other three/four-drug induction regimens. All patients subsequently underwent successful stem cell collection and upgraded responses to ORR 98% and ⩾VGPR 79% post transplant. At a median follow-up of 19.8 months after diagnosis, the 2-year OS probability was 95.3% (95%CI: 89-98). The presence of concurrent plasmacytoma at diagnosis was the only prognostic factor predicting poorer survival (HR=5.56; 95%CI: 0.92-33.74; P=0.03). CyBorD was well-tolerated, with no severe peripheral neuropathy and minimal hematologic toxicity. Therefore, CyBorD is a convenient, well-tolerated, highly effective induction regimen in preparation for autologous SCT in real-life clinical practice.
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Affiliation(s)
- N Areethamsirikul
- Department of Medical Oncology and Hematology, Princess Margaret Cancer Centre, Toronto, Ontario, Canada
| | - E Masih-Khan
- Department of Medical Oncology and Hematology, Princess Margaret Cancer Centre, Toronto, Ontario, Canada
| | - C-M Chu
- Department of Medical Oncology and Hematology, Princess Margaret Cancer Centre, Toronto, Ontario, Canada
| | - V Jimenez-Zepeda
- Department of Medical Oncology and Hematology, Princess Margaret Cancer Centre, Toronto, Ontario, Canada
| | - D E Reece
- Department of Medical Oncology and Hematology, Princess Margaret Cancer Centre, Toronto, Ontario, Canada
| | - S Trudel
- Department of Medical Oncology and Hematology, Princess Margaret Cancer Centre, Toronto, Ontario, Canada
| | - V Kukreti
- Department of Medical Oncology and Hematology, Princess Margaret Cancer Centre, Toronto, Ontario, Canada
| | - R Tiedemann
- Department of Medical Oncology and Hematology, Princess Margaret Cancer Centre, Toronto, Ontario, Canada
| | - C Chen
- Department of Medical Oncology and Hematology, Princess Margaret Cancer Centre, Toronto, Ontario, Canada
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7
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Wiehler J, Tiedemann R. Phylogeography of the European roe deer Capreolus capreolus as revealed by sequence analysis of the mitochondrial Control Region. ACTA ACUST UNITED AC 2014. [DOI: 10.4098/at.arch.98-58] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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8
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Schedina IM, Pfautsch S, Hartmann S, Dolgener N, Polgar A, Bianco PG, Tiedemann R, Ketmaier V. Isolation and characterization of eight microsatellite loci in the brook lamprey Lampetra planeri (Petromyzontiformes) using 454 sequence data. J Fish Biol 2014; 85:960-964. [PMID: 25059996 DOI: 10.1111/jfb.12470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Accepted: 06/12/2014] [Indexed: 06/03/2023]
Abstract
Eight polymorphic microsatellite loci were developed for the brook lamprey Lampetra planeri through 454 sequencing and their usefulness was tested in 45 individuals of both L. planeri and the river lamprey Lampetra fluviatilis. The number of alleles per loci ranged between two and five; the Italian and Irish populations had a mean expected heterozygosity of 0·388 and 0·424 and a mean observed heterozygosity of 0·418 and 0·411, respectively.
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Affiliation(s)
- I M Schedina
- Institute of Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany
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9
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Meckler AN, Sigman DM, Gibson KA, François R, Martínez-García A, Jaccard SL, Röhl U, Peterson LC, Tiedemann R, Haug GH. Erratum: Corrigendum: Deglacial pulses of deep-ocean silicate into the subtropical North Atlantic Ocean. Nature 2014. [DOI: 10.1038/nature12906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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10
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Mahler B, Schneider ARR, Di Giacomo AS, Di Giacomo AG, Reboreda JC, Tiedemann R. Microsatellite usefulness is independent of phylogenetic distance in Tyrant flycatchers (Aves: Tyrannidae): a test using two globally threatened species. Genet Mol Res 2013; 12:2966-72. [PMID: 24065652 DOI: 10.4238/2013.august.12.12] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Tyrant flycatchers (Aves: Tyrannidae) are endemic to the New World, and many species of this group are threatened or near-threatened at the global level. The aim of this study was to test the 18 microsatellite markers that have been published for other Tyrant flycatchers in the Strange-tailed Tyrant (Alectrurus risora) and the Sharp-tailed Tyrant (Culicivora caudacuta), two endemic species of southern South American grasslands that are classified as vulnerable. We also analyzed the usefulness of loci in relation to phylogenetic distance to the source species. Amplification success was high in both species (77 to 83%) and did not differ between the more closely and more distantly related species to the source species. Polymorphism success was also similar for both species, with 9 and 8 loci being polymorphic, respectively. An increased phylogenetic distance thus does not gradually lead to allelic or locus dropouts, implying that in Tyrant flycatchers, the published loci are useful independent of species relatedness.
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Affiliation(s)
- B Mahler
- Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II Ciudad Universitaria, Buenos Aires, Argentina
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11
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Meckler AN, Sigman DM, Gibson KA, François R, Martínez-García A, Jaccard SL, Röhl U, Peterson LC, Tiedemann R, Haug GH. Deglacial pulses of deep-ocean silicate into the subtropical North Atlantic Ocean. Nature 2013; 495:495-8. [PMID: 23538831 DOI: 10.1038/nature12006] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2012] [Accepted: 02/12/2013] [Indexed: 11/10/2022]
Abstract
Growing evidence suggests that the low atmospheric CO2 concentration of the ice ages resulted from enhanced storage of CO2 in the ocean interior, largely as a result of changes in the Southern Ocean. Early in the most recent deglaciation, a reduction in North Atlantic overturning circulation seems to have driven CO2 release from the Southern Ocean, but the mechanism connecting the North Atlantic and the Southern Ocean remains unclear. Biogenic opal export in the low-latitude ocean relies on silicate from the underlying thermocline, the concentration of which is affected by the circulation of the ocean interior. Here we report a record of biogenic opal export from a coastal upwelling system off the coast of northwest Africa that shows pronounced opal maxima during each glacial termination over the past 550,000 years. These opal peaks are consistent with a strong deglacial reduction in the formation of silicate-poor glacial North Atlantic intermediate water (GNAIW). The loss of GNAIW allowed mixing with underlying silicate-rich deep water to increase the silicate supply to the surface ocean. An increase in westerly-wind-driven upwelling in the Southern Ocean in response to the North Atlantic change has been proposed to drive the deglacial rise in atmospheric CO2 (refs 3, 4). However, such a circulation change would have accelerated the formation of Antarctic intermediate water and sub-Antarctic mode water, which today have as little silicate as North Atlantic Deep Water and would have thus maintained low silicate concentrations in the Atlantic thermocline. The deglacial opal maxima reported here suggest an alternative mechanism for the deglacial CO2 release. Just as the reduction in GNAIW led to upward silicate transport, it should also have allowed the downward mixing of warm, low-density surface water to reach into the deep ocean. The resulting decrease in the density of the deep Atlantic relative to the Southern Ocean surface promoted Antarctic overturning, which released CO2 to the atmosphere.
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Affiliation(s)
- A N Meckler
- Geological Institute, ETH Zürich, 8092 Zürich, Switzerland.
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12
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Fiorentino V, Manganelli G, Giusti F, Tiedemann R, Ketmaier V. A question of time: the land snailMurella muralis(Gastropoda: Pulmonata) reveals constraints on past ecological speciation. Mol Ecol 2012; 22:170-86. [DOI: 10.1111/mec.12107] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2012] [Revised: 09/20/2012] [Accepted: 09/26/2012] [Indexed: 11/30/2022]
Affiliation(s)
- V. Fiorentino
- Unit of Evolutionary Biology/Systematic Zoology; Institute of Biochemistry and Biology; University of Potsdam; Potsdam; 14476; Germany
| | - G. Manganelli
- Department of Environmental Sciences; University of Siena; Via P. A. Mattioli 4; Siena; 53100; Italy
| | - F. Giusti
- Department of Environmental Sciences; University of Siena; Via P. A. Mattioli 4; Siena; 53100; Italy
| | - R. Tiedemann
- Unit of Evolutionary Biology/Systematic Zoology; Institute of Biochemistry and Biology; University of Potsdam; Potsdam; 14476; Germany
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13
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Apio A, Kabasa JD, Ketmaier V, Schröder C, Plath M, Tiedemann R. Female philopatry and male dispersal in a cryptic, bush‐dwelling antelope: a combined molecular and behavioural approach. J Zool (1987) 2010. [DOI: 10.1111/j.1469-7998.2009.00654.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- A. Apio
- Institute of Biochemistry & Biology, Unit of Evolutionary Biology/Systematic Zoology, University of Potsdam, Potsdam, Germany
- Department of Veterinary Physiological Sciences, Faculty of Veterinary Medicine, Makerere University, Kampala, Uganda
| | - J. D. Kabasa
- Department of Veterinary Physiological Sciences, Faculty of Veterinary Medicine, Makerere University, Kampala, Uganda
| | - V. Ketmaier
- Institute of Biochemistry & Biology, Unit of Evolutionary Biology/Systematic Zoology, University of Potsdam, Potsdam, Germany
| | - C. Schröder
- Institute of Biochemistry & Biology, Unit of Evolutionary Biology/Systematic Zoology, University of Potsdam, Potsdam, Germany
| | - M. Plath
- Institute of Biochemistry & Biology, Unit of Evolutionary Biology/Systematic Zoology, University of Potsdam, Potsdam, Germany
| | - R. Tiedemann
- Institute of Biochemistry & Biology, Unit of Evolutionary Biology/Systematic Zoology, University of Potsdam, Potsdam, Germany
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14
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Stuckas H, Stoof K, Quesada H, Tiedemann R. Evolutionary implications of discordant clines across the Baltic Mytilus hybrid zone (Mytilus edulis and Mytilus trossulus). Heredity (Edinb) 2009; 103:146-56. [DOI: 10.1038/hdy.2009.37] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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15
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Feulner PGD, Kirschbaum F, Mamonekene V, Ketmaier V, Tiedemann R. Adaptive radiation in African weakly electric fish (Teleostei: Mormyridae: Campylomormyrus): a combined molecular and morphological approach. J Evol Biol 2007; 20:403-14. [PMID: 17210033 DOI: 10.1111/j.1420-9101.2006.01181.x] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
We combined multiple molecular markers and geometric morphometrics to revise the current taxonomy and to build a phylogenetic hypothesis for the African weakly electric fish genus Campylomormyrus. Genetic data (2039 bp DNA sequence of mitochondrial cytochrome b and nuclear S7 genes) on 106 specimens support the existence of at least six species occurring in sympatry. We were able to further confirm these species by microsatellite analysis at 16 unlinked nuclear loci and landmark-based morphometrics. We assigned them to nominal taxa by comparisons to type specimens of all Campylomormyrus species recognized so far. Additionally, we showed that the shape of the elongated trunk-like snout is the major source of morphological differentiation among them. This finding suggests that the radiation of this speciose genus might have been driven by adaptation to different food sources.
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Affiliation(s)
- P G D Feulner
- Unit of Evolutionary Biology/Systematic Zoology, Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Germany
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16
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Hauswaldt JS, Stuckas H, Pfautsch S, Tiedemann R. Molecular characterization of MHC class II in a nonmodel anuran species, the fire-bellied toad Bombina bombina. Immunogenetics 2007; 59:479-91. [PMID: 17406862 DOI: 10.1007/s00251-007-0210-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2007] [Accepted: 03/01/2007] [Indexed: 10/23/2022]
Abstract
While the anuran Xenopus comprises one of the best characterized nonmammalian taxa regarding the major histocompatibility complex (MHC), the organization of this gene complex has never been studied in other anurans, and information on amphibian MHC (other than Xenopus) is generally very scarce. Here, we describe the characterization of the first MHC class II B cDNA sequences from a nonmodel anuran species, the European fire-bellied toad (Bombina bombina). We isolated two transcript sequences differing substantially in amino acid composition and length within the beta2 domain. To investigate the variability of the peptide binding region in this species, we sequenced a 158-bp large fragment from wild B. bombina (n = 20) and identified eight distinct alleles. All substitutions but one were nonsynonymous, and many of the highly polymorphic sites corresponded with amino acid positions known to be involved in antigen binding. The level of variation we found in B. bombina was similar compared to that previously found in a comparable sample of a wild urodelan species, Ambystoma tigrinum, and to that found in Xenopus laevis. Based on the cDNA data and the individual's allelic diversity, we conclude that Bombina possesses at least two class II B loci. With our new beta1 primers, we were able to generate sequences in other species of anurans. We provide here a first phylogenetic analysis of this gene in amphibians.
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Affiliation(s)
- J Susanne Hauswaldt
- Unit of Evolutionary Biology/Systematic Zoology, University of Potsdam, Potsdam, Germany
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17
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Plath M, Hauswaldt JS, Moll K, Tobler M, García De León FJ, Schlupp I, Tiedemann R. Local adaptation and pronounced genetic differentiation in an extremophile fish, Poecilia mexicana, inhabiting a Mexican cave with toxic hydrogen sulphide. Mol Ecol 2006; 16:967-76. [PMID: 17305854 DOI: 10.1111/j.1365-294x.2006.03212.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We investigated genetic differentiation and migration patterns in a small livebearing fish, Poecilia mexicana, inhabiting a sulfidic Mexican limestone cave (Cueva del Azufre). We examined fish from three different cave chambers, the sulfidic surface creek draining the cave (El Azufre) and a nearby surface creek without the toxic hydrogen sulphide (Arroyo Cristal). Using microsatellite analysis of 10 unlinked loci, we found pronounced genetic differentiation among the three major habitats: Arroyo Cristal, El Azufre and the cave. Genetic differentiation was also found within the cave between different pools. An estimation of first-generation migrants suggests that (i) migration is unidirectional, out of the cave, and (ii) migration among different cave chambers occurs to some extent. We investigated if the pattern of genetic differentiation is also reflected in a morphological trait, eye size. Relatively large eyes were found in surface habitats, small eyes in the anterior cave chambers, and the smallest eyes were detected in the innermost cave chamber (XIII). This pattern shows some congruence with a previously proposed morphocline in eye size. However, our data do not support the proposed mechanism for this morphocline, namely that it would be maintained by migration from both directions into the middle cave chambers. This would have led to an increased variance in eye size in the middle cave chambers, which we did not find. Restricted gene flow between the cave and the surface can be explained by local adaptations to extreme environmental conditions, namely H2S and absence of light. Within the cave system, habitat properties are patchy, and genetic differentiation between cave chambers despite migration could indicate local adaptation at an even smaller scale.
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Affiliation(s)
- M Plath
- Unit of Evolutionary Biology/Systematic Zoology, Institute of Biochemistry and Biology, University of Potsdam, Germany.
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18
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Feulner PGD, Kirschbaum F, Schugardt C, Ketmaier V, Tiedemann R. Electrophysiological and molecular genetic evidence for sympatrically occuring cryptic species in African weakly electric fishes (Teleostei: Mormyridae: Campylomormyrus). Mol Phylogenet Evol 2006; 39:198-208. [PMID: 16271299 DOI: 10.1016/j.ympev.2005.09.008] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2005] [Revised: 09/07/2005] [Accepted: 09/07/2005] [Indexed: 11/23/2022]
Abstract
For two sympatric species of African weakly electric fish, Campylomormyrus tamandua and Campylomormyrus numenius, we monitored ontogenetic differentiation in electric organ discharge (EOD) and established a molecular phylogeny, based on 2222bp from cytochrome b, the S7 ribosomal protein gene, and four flanking regions of unlinked microsatellite loci. In C. tamandua, there is one common EOD type, regardless of age and sex, whereas in C. numenius we were able to identify three different male adult EOD waveform types, which emerged from a single common EOD observed in juveniles. Two of these EOD types formed well supported clades in our phylogenetic analysis. In an independent line of evidence, we were able to affirm the classification into three groups by microsatellite data. The correct assignment and the high pairwise F(ST) values support our hypothesis that these groups are reproductively isolated. We propose that in C. numenius there are cryptic species, hidden behind similar and, at least as juveniles, identical morphs.
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Affiliation(s)
- P G D Feulner
- Unit of Evolutionary Biology/Systematic Zoology, Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Germany
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19
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Grobler J, Hartl G, Grobler N, Kotze A, Botha K, Tiedemann R. The genetic status of an isolated black wildebeest (Connochaetes gnou) population from the Abe Bailey Nature Reserve, South Africa: Microsatellite data on a putative past hybridization with blue wildebeest (C. taurinus). Mamm Biol 2005. [DOI: 10.1078/1616-5047-00174] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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20
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Tiedemann R, Paulus KB, Scheer M, von Kistowski KG, Skírnisson K, Bloch D, Dam M. Mitochondrial DNA and microsatellite variation in the eider duck (Somateria mollissima) indicate stepwise postglacial colonization of Europe and limited current long-distance dispersal. Mol Ecol 2004; 13:1481-94. [PMID: 15140092 DOI: 10.1111/j.1365-294x.2004.02168.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
To unravel the postglacial colonization history and the current intercolony dispersal in the common eider, Somateria mollissima, we analysed genetic variation at a part of the mitochondrial control region and five unlinked autosomal microsatellite loci in 175 eiders from 11 breeding colonies, covering the entire European distribution range of this species. As a result of extreme female philopatry, mitochondrial DNA differentiation is substantial both among local colonies and among distant geographical regions. Our study further corroborates the previous hypothesis of a single Pleistocene refugium for European eiders. A nested clade analysis on mitochondrial haplotypes suggests that (i) the Baltic Sea eider population is genetically closest to a presumably ancestral population and that (ii) the postglacial recolonization progressed in a stepwise fashion via the North Sea region and the Faroe Islands to Iceland. Current long-distance dispersal is limited. Differentiation among colonies is much less pronounced at microsatellite loci. The geographical pattern of this nuclear genetic variation is to a large extent explained by isolation by distance. As female dispersal is very limited, the geographical pattern of nuclear variation is probably explained by male-mediated gene flow among breeding colonies. Our study provides genetic evidence for the assumed prominent postglacial colonization route shaping the present terrestrial fauna of the North Atlantic islands Iceland and the Faroes. It suggests that this colonization had been a stepwise process originating in continental Europe. It is the first molecular study on eider duck populations covering their entire European distribution range.
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Affiliation(s)
- R Tiedemann
- Unit of Evolutionary Biology/Systematic Zoology, Institute of Biochemistry and Biology, University of Potsdam, D-14476 Potsdam, Germany
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21
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Ravaoarimanana IB, Tiedemann R, Montagnon D, Rumpler Y. Molecular and cytogenetic evidence for cryptic speciation within a rare endemic Malagasy lemur, the Northern Sportive Lemur (Lepilemur septentrionalis). Mol Phylogenet Evol 2004; 31:440-8. [PMID: 15062786 DOI: 10.1016/j.ympev.2003.08.020] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2002] [Revised: 07/11/2003] [Indexed: 10/27/2022]
Abstract
Evolutionary relationships of different populations of the threatened malagasy lemur Lepilemur septentrionalis were assessed by sequence analysis of mitochondrial DNA (D-loop region and partial Cyt b gene). One hundred and fifty nine samples were collected from five main different localities in the northern part of Madagascar. We applied the phylogenetic species concept based on fixed diagnostic differences to determine the status of different geographical populations. No nucleotide site diagnoses Ankarana from Andrafiamena or Analamera. However, numerous fixed differences separate Sahafary from all other populations. These results were corroborated by phylogenetic trees. As previous cytogenetic studies, our molecular data suggest that two cryptic species of Lepilemur occur in the extreme north of Madagascar. This speciation is probably caused by chromosomal rearrangements in at least one of the evolutionary lineages. Our study comprises another striking example of how molecular genetic assay can detect phylogenetic discontinuities that are not reflected in traditional morphologically based taxonomies. Our study indicates that the Sahafary population is a hitherto undescribed endangered endemic species which urgently needs conservation efforts.
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Affiliation(s)
- I B Ravaoarimanana
- Unit of Evolutionary Biology/Systematic Zoology, Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Germany
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22
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Schmittner A, Sarnthein N, Kinkel H, Bartoli G, Bickert T, Crucifix M, Crudeli D, Groeneveld J, Kösters F, Mikolajewicz U, Millo C, Reumer J, Schäfer P, Schmidt D, Schneider B, Schulz M, Steph S, Tiedemann R, Weinelt M, Zuvela M. Global impact of the Panamanian seaway closure. ACTA ACUST UNITED AC 2004. [DOI: 10.1029/2004eo490010] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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23
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Paulus KB, Tiedemann R. Ten polymorphic autosomal microsatellite loci for the Eider duck Somateria mollissima and their cross-species applicability among waterfowl species (Anatidae). ACTA ACUST UNITED AC 2003. [DOI: 10.1046/j.1471-8286.2003.00414.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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24
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Vernesi C, Pecchioli E, Caramelli D, Tiedemann R, Randi E, Bertorelle G. The genetic structure of natural and reintroduced roe deer (Capreolus capreolus) populations in the Alps and central Italy, with reference to the mitochondrial DNA phylogeography of Europe. Mol Ecol 2002; 11:1285-97. [PMID: 12144651 DOI: 10.1046/j.1365-294x.2002.01534.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The first hypervariable fragment (HVI) of the mitochondrial DNA control region was sequenced in 90 individuals of the European roe deer (Capreolus capreolus) from the Alps, central Italy and Spain. Pooling these data with 70 published sequences from several European regions, we were able to identify patterns of divergence within the Italian peninsula, and in Europe in general. The results we obtained can be summarized as follows. First, the genetic structure of European roe deer populations is substantial (PhiST values around 0.6). Second, the divergence between some central Italian populations, the Alpine group (which is genetically close to the French, the Spanish and the Norwegian samples) and the Eastern European populations seems to reflect Upper Pleistocene subdivisions, possibly related to three southern European refugia. Third, a different group of central Italian individuals probably diverged more recently from the Alpine group, and their attribution to the subspecies C. c. italicus does not appear justified. Fourth, the analysis of mitochondrial DNA in the roe deer can be used to identify recently reintroduced animals in the western Alps which clearly cluster within the Eastern European group, thus providing an important tool for conservation and management strategies for this species.
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Affiliation(s)
- C Vernesi
- Dipartimento di Biologia, Università di Ferrara, Italy
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25
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Vandebona H, Goonesekere N, Tiedemann R, Ratnasooriya W, Gunasekera M. Sequence variation at two mitochondrial genes in the Asian elephant (Elephas maximus) population of Sri Lanka. Mamm Biol 2002. [DOI: 10.1078/1616-5047-00030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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26
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Abstract
We simulated large mammal populations using an individual-based stochastic model under various sex-specific migration schemes and life history parameters from the blue whale and the Asian elephant. Our model predicts that genetic structure at nuclear loci is significantly more influenced by female than by male migration. We identified requisite comigration of mother and offspring during gravidity and lactation as the primary cause of this phenomenon. In addition, our model predicts that the common assumption that geographical patterns of mitochondrial DNA (mtDNA) could be translated into female migration rates (Nmf) will cause biased estimates of maternal gene flow when extensive male migration occurs and male mtDNA haplotypes are included in the analysis.
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Affiliation(s)
- R Tiedemann
- Unit of Evolutionary Genetics, Institute of Molecular Biology and Medicine, Free University of Brussels, Belgium.
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27
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Eeckhaut I, McHugh D, Mardulyn P, Tiedemann R, Monteyne D, Jangoux M, Milinkovitch MC. Myzostomida: a link between trochozoans and flatworms? Proc Biol Sci 2000; 267:1383-92. [PMID: 10983821 PMCID: PMC1690696 DOI: 10.1098/rspb.2000.1154] [Citation(s) in RCA: 90] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Myzostomids are obligate symbiotic invertebrates associated with echinoderms with a fossil record that extends to the Ordovician period. Due to their long history as host-specific symbionts, myzostomids have acquired a unique anatomy that obscures their phylogenetic affinities to other metazoans: they are incompletely segmented, parenchymous, acoelomate organisms with chaetae and a trochophore larva. Today, they are most often classified within annelids either as an aberrant family of polychaetes or as a separate class. We inferred the phylogenetic position of the Myzostomida by analysing the DNA sequences of two slowly evolving nuclear genes: the small subunit ribosomal RNA and elongation factor-1alpha. All our analyses congruently indicated that myzostomids are not annelids but suggested instead that they are more closely related to flatworms than to any trochozoan taxon. These results, together with recent analyses of the myzostomidan ultrastructure, have significant implications for understanding the evolution of metazoan body plans, as major characters (segmentation, coeloms, chaetae and trochophore larvae) might have been independently lost or gained in different animal phyla.
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Affiliation(s)
- I Eeckhaut
- Marine Biology Laboratory, University of Mons, Belgium.
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28
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Cassens I, Tiedemann R, Suchentrunk F, Hartl GB. Mitochondrial DNA variation in the European otter (Lutra lutra) and the use of spatial autocorrelation analysis in conservation. J Hered 2000; 91:31-5. [PMID: 10739121 DOI: 10.1093/jhered/91.1.31] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
To add genetic information to the international conservation efforts on European otters Lutra lutra, we investigated the genetic population structure in and around a known "source" population of the otter, the Oberlausitz (OL) in eastern Germany. This was complemented by a first survey of genetic variation levels in the Central European otter population. Sequence analysis of 300bp of the mitochondrial control region in 76 specimens from the eastern German study region and 53 individuals from several other European populations revealed a low level of genetic variation, with only 5 haplotypes present and nucleotide diversities within populations ranging from 0.00% to 0.17%. Apart from eastern Germany, one haplotype was by far the most abundant one, from which other, only locally occurring types, could be derived by a single point mutation. This suggests a single Pleistocene refugium from which the analyzed European regions have been reinvaded after the glaciations. Within eastern Germany, two abundant haplotypes were found. Their occurrence differed significantly among subregions of eastern Germany. The uneven distribution of a locally restricted but abundant haplotype could be explained by isolation-by-distance and might reflect emigration from the OL source population to surrounding regions. This suggests that vital local populations can indeed serve as "sources" for the invasion of surrounding areas. Given a suitable genetic marker, we suggest a spatial autocorrelation analysis to monitor the genetic effect of such an emigration from a source population.
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Affiliation(s)
- I Cassens
- Institut für Haustierkunde, University of Kiel, Germany
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29
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Hammer SE, Suchentrunk F, Tiedemann R, Hartl GB, Feiler A. Mitochondrial DNA sequence relationships of the newly described enigmatic Vietnamese bovid, Pseudonovibos spiralis. Naturwissenschaften 1999; 86:279-80. [PMID: 10402602 DOI: 10.1007/s001140050614] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- S E Hammer
- Research Institute of Wildlife Ecology, Vienna Veterinary University, Austria.
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30
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Tiedemann R, von Kistowski KG. Novel primers for the mitochondrial control region and its homologous nuclear pseudogene in the Eider duck Somateria mollissima. Anim Genet 1998; 29:468. [PMID: 9883523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Affiliation(s)
- R Tiedemann
- Institut für Haustierkunde, Christian-Albrechts-Universität zu Kiel, Germany
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31
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33
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Tiedemann R. [Neurogenic tumors of the trachea]. HNO 1992; 40:41-3. [PMID: 1568885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
To date, 20 cases of solitary neurilemmoma and neurofibroma of the trachea have been reported. We report the symptoms, diagnosis and treatment of a neurilemmoma of the upper trachea in an 8-year-old girl. The presenting symptom is usually progressive stridor. Radiography, without contrast medium, and tomography confirm the diagnosis. The latter should take into account the possible mediastinal involvement by dumb-bell tumours. The tumours appear in all sections of the trachea but usually lie on the back wall. Endoscopy is not always necessary because it carries risks. For most tumours a tracheotomy provides adequate access, if necessary combined with endoscopy. If the tumour lies distally in the trachea a thoracic approach may be necessary: in the case of mediastinal involvement, it is obligatory.
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Affiliation(s)
- R Tiedemann
- Hals-Nasen-Ohrenabteilung, Allgemeinen Krankenhaus Barmbek, Hamburg
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Sarnthein M, Pflaumann U, Ross R, Tiedemann R, Winn K. Transfer functions to reconstruct ocean palaeoproductivity: a comparison. ACTA ACUST UNITED AC 1992. [DOI: 10.1144/gsl.sp.1992.064.01.27] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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35
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Tiedemann R. [The acute purulent and the secretory otitis media. Problems of definition (author's transl)]. HNO 1981; 29:370-3. [PMID: 7198108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Without change we know the typical manifestation of the purulent infection of the middle-ear with its complications. Certainly, however, opposite to these cardinal forms there are plenty of them with a mixed, falsified and levelled manifestation. Concerning the acute purulent otitis today Fleischer differentiates the "typical", the "light and abortive", the "latent" and the "protracted" form. Respecting the secretory otitis media however, there has been no change of shape - but only an evident increase of morbidity accounting to the acute purulent infection of the middle ear. Microscopical and electron microscopical as well as immunological researches have essentially cleared up the pathogeny of the secretory otitis media. The same is valid for the special form of the blue ear drum, the idiopathic hemotympanum.
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36
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Tiedemann R. [The conservative treatment of inner ear diseases. A survey of the actual possibilities (author's transl)]. HNO 1978; 26:241-3. [PMID: 681186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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37
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38
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Tiedemann R, Börger U. [Surgical management of sudden deafness (author's transl)]. HNO 1975; 23:82-3. [PMID: 1205990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The conservative treatment of idiopathic sudden deafness generally shows good results. There are, however, some cases resistant to therapy which may be treated surgically by vestibulotomy. Reports are made on personal experiences as well as those of other authors. Vestibulotomy is recommended for those patients in whom the possibilities of conservative therapy have been exhausted and severe hearing loss has occurred.
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39
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Tiedemann R, Müller-Kortkamp G. [Specialized, plastic, and reconstructive surgery. Cooperative care of mid-facial injuries]. HNO 1974; 22:24-7. [PMID: 4151703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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40
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Tiedemann R. [Proceedings: Blastomatous criteria of granuloma gangraenescens]. Arch Klin Exp Ohren Nasen Kehlkopfheilkd 1973; 205:342-5. [PMID: 4594480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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41
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Tiedemann R. [Comparative statistics of patients older than 70 years in 3 E.N.T. clinics]. HNO 1972; 20:307-9. [PMID: 4637586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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42
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43
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Tiedemann R. Aussprache. Langenbecks Arch Surg 1964. [DOI: 10.1007/bf01439423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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44
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45
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