Cellular Origin, Life in Extreme Habitats and Astrobiology, 2011
... Pure Appl Chem 75(6):683–800 Delwiche CC, Steyn PL (1970) Nitrogen isotope fractionation in s... more ... Pure Appl Chem 75(6):683–800 Delwiche CC, Steyn PL (1970) Nitrogen isotope fractionation in soils and microbial reactions. Environ Sci Technol 4:929–935 De Pol-Holz R, Ulloa O, Dezileau L, Kaiser J, Lamy F, Hebbeln D (2006) Melting of the Patagonian Ice Sheet and ...
... (2) O umbonatus with Triloculina tricarinata and C. wuellerstorfi (including as minor compone... more ... (2) O umbonatus with Triloculina tricarinata and C. wuellerstorfi (including as minor components also ... html; see Campbell and Aarup, 1992; Antoine et al., 1996; Behrenfeld and Falkowski, 1997; Falkowski et al, 1998) offers exciting new possibilities to determine production rates ...
Accumulation rates of individual species (SpecAR) and relative abundances (percentages) of benthi... more Accumulation rates of individual species (SpecAR) and relative abundances (percentages) of benthic foraminifera of an AMS 14C-dated high resolution sediment core from the Norwegian Seas (water depth: 2707 m) provide a record of the faunal fluctuations from the last glacial maximum across the Weichselian deglaciation to the Holocene. During glacial times, the total foraminifera accumulation remains at a very low
... Marine Chemistry 59 (1997) 3549 Stable nitrogen and carbon isotopes as indicator ofeutrophica... more ... Marine Chemistry 59 (1997) 3549 Stable nitrogen and carbon isotopes as indicator ofeutrophication ... be elevated due to reduced isotopic fractionation of CO during phytoplankton uptake (Cifuentes ... During a period of phosphorus eutrophication an increase in "C of more than lo ...
Madagascar provides some of the rare examples where two or more primate species of the same genus... more Madagascar provides some of the rare examples where two or more primate species of the same genus and with seemingly identical niche requirements occur in sympatry. If congeneric primate species co-occur in other parts of the world, they differ in size in a way that is consistent with Hutchinson’s rule for coexisting species, or they occupy different ecological niches. In some areas of Madagascar, mouse lemurs do not follow these “rules” and thus seem to violate one of the principles of community ecology. In order to understand the mechanisms that allow coexistence of sympatric congeneric species without obvious niche differentiation we studied food composition of two identical sized omnivorous mouse lemur species, Microcebus griseorufus and M. murinus with the help of stable isotope analyses (15N and 13C). The two species are closely related sister species. During the rich season, when food seems abundant, the two species do not differ in their nitrogen isotope composition, indicating that the two species occupy the same trophic level. But they differ in their 13C values, indicating that M. griseorufus feeds more on C4 and CAM plants than M. murinus. During the lean season, M. murinus has lower 15N values, indicating that the two species feed at different trophic levels during times of food shortage. Hybrids between the two species showed intermediate food composition. The results reflect subtle differences in foraging or metabolic adaptations that are difficult to quantify by traditional observations but that represent possibilities to allow coexistence of species.
Organic matter is mineralized in marine sediments by microbial activity using predominantly oxyge... more Organic matter is mineralized in marine sediments by microbial activity using predominantly oxygen, sulfate, and metal oxides as electron acceptors. Modern euxinic basins as found in the Baltic Sea or the Black Sea are of particular importance because they may serve as type systems for anoxia in Earth's history. We present here results from biogeochemical investigations carried out in the
... RESEARCH ARTICLES. An early Hettangian coral reef in southern France: Implications for the en... more ... RESEARCH ARTICLES. An early Hettangian coral reef in southern France: Implications for the end-Triassic reef crisis. Wolfgang Kiessling * ,1 ,5 , Ewa Roniewicz 2 , Loïc Villier 3 , Philippe Léonide 3 ,4 and Ulrich Struck 1 1 Museum ...
Cellular Origin, Life in Extreme Habitats and Astrobiology, 2011
... Pure Appl Chem 75(6):683–800 Delwiche CC, Steyn PL (1970) Nitrogen isotope fractionation in s... more ... Pure Appl Chem 75(6):683–800 Delwiche CC, Steyn PL (1970) Nitrogen isotope fractionation in soils and microbial reactions. Environ Sci Technol 4:929–935 De Pol-Holz R, Ulloa O, Dezileau L, Kaiser J, Lamy F, Hebbeln D (2006) Melting of the Patagonian Ice Sheet and ...
... (2) O umbonatus with Triloculina tricarinata and C. wuellerstorfi (including as minor compone... more ... (2) O umbonatus with Triloculina tricarinata and C. wuellerstorfi (including as minor components also ... html; see Campbell and Aarup, 1992; Antoine et al., 1996; Behrenfeld and Falkowski, 1997; Falkowski et al, 1998) offers exciting new possibilities to determine production rates ...
Accumulation rates of individual species (SpecAR) and relative abundances (percentages) of benthi... more Accumulation rates of individual species (SpecAR) and relative abundances (percentages) of benthic foraminifera of an AMS 14C-dated high resolution sediment core from the Norwegian Seas (water depth: 2707 m) provide a record of the faunal fluctuations from the last glacial maximum across the Weichselian deglaciation to the Holocene. During glacial times, the total foraminifera accumulation remains at a very low
... Marine Chemistry 59 (1997) 3549 Stable nitrogen and carbon isotopes as indicator ofeutrophica... more ... Marine Chemistry 59 (1997) 3549 Stable nitrogen and carbon isotopes as indicator ofeutrophication ... be elevated due to reduced isotopic fractionation of CO during phytoplankton uptake (Cifuentes ... During a period of phosphorus eutrophication an increase in "C of more than lo ...
Madagascar provides some of the rare examples where two or more primate species of the same genus... more Madagascar provides some of the rare examples where two or more primate species of the same genus and with seemingly identical niche requirements occur in sympatry. If congeneric primate species co-occur in other parts of the world, they differ in size in a way that is consistent with Hutchinson’s rule for coexisting species, or they occupy different ecological niches. In some areas of Madagascar, mouse lemurs do not follow these “rules” and thus seem to violate one of the principles of community ecology. In order to understand the mechanisms that allow coexistence of sympatric congeneric species without obvious niche differentiation we studied food composition of two identical sized omnivorous mouse lemur species, Microcebus griseorufus and M. murinus with the help of stable isotope analyses (15N and 13C). The two species are closely related sister species. During the rich season, when food seems abundant, the two species do not differ in their nitrogen isotope composition, indicating that the two species occupy the same trophic level. But they differ in their 13C values, indicating that M. griseorufus feeds more on C4 and CAM plants than M. murinus. During the lean season, M. murinus has lower 15N values, indicating that the two species feed at different trophic levels during times of food shortage. Hybrids between the two species showed intermediate food composition. The results reflect subtle differences in foraging or metabolic adaptations that are difficult to quantify by traditional observations but that represent possibilities to allow coexistence of species.
Organic matter is mineralized in marine sediments by microbial activity using predominantly oxyge... more Organic matter is mineralized in marine sediments by microbial activity using predominantly oxygen, sulfate, and metal oxides as electron acceptors. Modern euxinic basins as found in the Baltic Sea or the Black Sea are of particular importance because they may serve as type systems for anoxia in Earth's history. We present here results from biogeochemical investigations carried out in the
... RESEARCH ARTICLES. An early Hettangian coral reef in southern France: Implications for the en... more ... RESEARCH ARTICLES. An early Hettangian coral reef in southern France: Implications for the end-Triassic reef crisis. Wolfgang Kiessling * ,1 ,5 , Ewa Roniewicz 2 , Loïc Villier 3 , Philippe Léonide 3 ,4 and Ulrich Struck 1 1 Museum ...
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