Ecological and Geographical Differentiation of the Winter Fauna of Birds and Mammals in the Seas of Northeastern Russia

Four natural Amazonian Anopheles darlingi populations were analyzed for 19 loci, 12 of which showed variation, i.e., 68.4% of polymorphic loci. The Ariquemes, Rondônia, population was the most variable, with a large number of alleles per locus (2.26 ± 0.27) and high polymorphism (P = 63.15). The highest values of observed and expected intralocus heterozygosity were observed in the Manaus, Amazonas, population (Ho = 0.432 ± 0.11; He = 0.375 ± 0.08), and the lowest in the Cachoeira Porteira, Pará, population (Ho = 0.236 ± 0.09; He = 0.290 ± 0.11). Wright's F-statistic revealed disequilibrium caused by an excess of homozygotes, as shown by the Fis > Fst values (Fis = 0.083 > 0.026) reflecting intrapopulational differentiation. The four populations studied were genetically similar, as indicated by distance and similarity values. Chromosomal variation of Amazon population also did not indicate geographical differentiation, and populations in the central region of the Amazon Basin showed high polymorphism in relation to the marginal populations, which were mainly monomorphic.

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Genetic Diversity and Geographical Differentiation in Asian Common Wheat (Triticum aestivum L.), Revealed by the Analysis of Peroxidase and Esterase Isozymes

Breeding Science ◽

10.1270/jsbbs.55.175 ◽

2005 ◽

Vol 55 (2) ◽

pp. 175-185 ◽

Cited By ~ 8

Author(s):

Surya Kant Ghimire ◽

Yukari Akashi ◽

Chieko Maitani ◽

Masakazu Nakanishi ◽

Kenji Kato

Keyword(s):

Genetic Diversity ◽

Triticum Aestivum ◽

Common Wheat ◽

Triticum Aestivum L ◽

Geographical Differentiation ◽

Esterase Isozymes

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High-temperature thermomagnetic properties of vivianite nodules, Lake El'gygytgyn, Northeast Russia

Climate of the Past ◽

10.5194/cp-9-433-2013 ◽

2013 ◽

Vol 9 (1) ◽

pp. 433-446 ◽

Cited By ~ 14

Author(s):

P. S. Minyuk ◽

T. V. Subbotnikova ◽

L. L. Brown ◽

K. J. Murdock

Keyword(s):

Magnetic Susceptibility ◽

High Temperature ◽

Magnetic Measurements ◽

Iron Phosphate ◽

Northeastern Russia ◽

Northeast Russia ◽

Low Field ◽

Lake El’Gygytgyn ◽

Monoclinic Pyrrhotite ◽

Thermomagnetic Properties

Abstract. Vivianite, a hydrated iron phosphate, is abundant in sediments of Lake El'gygytgyn, located in the Anadyr Mountains of central Chukotka, northeastern Russia (67°30′ N, 172°05′ E). Magnetic measurements, including mass-specific low-field AC magnetic susceptibility, field-dependent magnetic susceptibility, hysteresis parameters, temperature dependence of the induced magnetization, as well as susceptibility in different heating media, provide ample information on vivianite nodules. Electron microprobe analyses, electron microscopy and energy dispersive spectroscopy were used to identify diagnostic minerals. Vivianite nodules are abundant in both sediments of cold (anoxic) and warm (oxic) stages. Magnetic susceptibility of the nodules varies from 0.78 × 10−6 m3 kg−1 to 1.72 × 10−6 m3 kg−1 (average = 1.05 × 10−6 m3 kg−1) and is higher than the susceptibility of sediments from the cold intervals. Magnetic properties of vivianite are due to the respective product of oxidation as well as sediment and mineral inclusions. Three types of curves for high-temperature dependent susceptibility of vivianite indicate different degrees of oxidation and inclusions in the nodules. Vivianite acts as a reductant and reduces hematite to magnetite and masks the goethite–hematite transition during heating. Heating vivianite and sulfur mixtures stimulates the formation of monoclinic pyrrhotite. An additive of arsenic inhibits the formation of magnetite prior to its Curie temperature. Heating selective vivianite and pyrite mixtures leads to formation of several different minerals – magnetite, monoclinic pyrrhotite, and hexagonal pyrrhotite, and makes it difficult to interpret the thermomagnetic curves.

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