The Taxonomic Position of Silene Multinervia (Caryophyllaceae), Endemic to California and Northwestern Mexico, and Description of Section Californicae, sect. nov.

Rhodora ◽  
10.3119/20-15 ◽  
2021 ◽  
Vol 122 (991) ◽  
Author(s):  
Duilio Iamonico
Keyword(s):  
Taxonomic Position ◽  
Northwestern Mexico

The taxonomic position ofCeraria Pears. & Steph.,Portulacaria Jacq, andSilvaea Phil

1986 ◽  
Vol 97 (11-12) ◽  
pp. 775-777
Author(s):  
B. Louis Nyananyo ◽  
J. Dele Olowokudejo
Keyword(s):  
Taxonomic Position

The first record of Jaapia ochroleuca (Basidiomycota) in the European part of Russia

2013 ◽  
Vol 47 ◽  
pp. 68-73
Author(s):  
S. V. Volobuev
Keyword(s):  
Nature Reserve ◽  
First Record ◽  
European Part ◽  
European Russia ◽  
Taxonomic Position ◽  
Morphological Description ◽  
Microscopic Structure ◽  
European Part Of Russia ◽  
Distribution And Ecology ◽  
First Time

The corticioid basidiomycete Jaapia ochroleuca (Bres.) Nannf. et J. Erikss. is recorded for the first time in the European Russia from the «Bryansky Les» Nature Reserve (Bryansk Region). The taxonomic position of the species is defined briefly. Its morphological description and data on distribution and ecology are provided. The details of microscopic structure of the collected specimen are illustrated.

Population size and trends for nesting ospreys in northwestern Mexico: Region-wide surveys, 1977, 1992/1993 and 2006

2007 ◽  
Author(s):  
Charles J. Henny ◽  
Daniel W. Anderson ◽  
Aradit Castellanos Vera ◽  
Jean-Luc E. Carton
Keyword(s):  
Population Size ◽  
Northwestern Mexico

Anthropogenic and climate induced trace element contamination in a water reservoir in northwestern Mexico

2021 ◽  
Author(s):  
Roberto Ochoa-Contreras ◽  
Martín Enrique Jara-Marini ◽  
Joan-Albert Sanchez-Cabeza ◽  
Diana María Meza-Figueroa ◽  
Libia Hascibe Pérez-Bernal ◽  
...  
Keyword(s):  
Trace Element ◽  
Water Reservoir ◽  
Northwestern Mexico ◽  
Trace Element Contamination

Comprehensive palaeomagnetic study of San Borja and Jaraguay monogenetic volcanic fields, Baja California (28–30° N): considerations on latitudinal corrections

2021 ◽  
Author(s):  
A N Mahgoub ◽  
B I García-Amador ◽  
L M Alva-Valdivia
Keyword(s):  
Dipole Moment ◽  
Late Miocene ◽  
Baja California ◽  
Temporal Distribution ◽  
Magnetic Minerals ◽  
Kinematic Evolution ◽  
Oxidation Reduction ◽  
Volcanic Fields ◽  
Spatio Temporal ◽  
Northwestern Mexico

Summary We report 24 palaeomagnetic directions and 10 high-quality Thellier-derived palaeointensity (PI) values, obtained from 27 sites located in Baja California Peninsula, northwestern Mexico. Sampling was done in four rock units (magnesian andesites, calc-alkaline lavas, ignimbrites, adakites) belonging to San Borja and Jaraguay monogenetic volcanic fields. These units have erupted between ∼ 15 and 2.6 Ma (previous K-Ar and 40Ar/39Ar data); hence results are presented in two consecutive periods: middle-late Miocene and Pliocene. The identified main magnetic minerals in the sampled sites are titanomagnetite, magnetite, and minor hematite, of variable grain size, present as intergrowths or surrounding grains, which reflect varying oxidation/reduction conditions during emplacement of high-temperature magmas. Based on previous geological and geophysical records, the kinematic evolution was carefully considered in the region, allowing for the independent restoration of the palaeoposition of each sampled site. Previous palaeodirections were also evaluated and corrected for tectonic motion in order to combine them with present data. Accordingly, a number of 15 and 36 directional data are used to calculate palaeopole position for Pliocene and middle-late Miocene periods, respectively, selected from a total of 74 data points. Pliocene (Plat = 87.8°, Plong = 147.5°, K = 41.06, A95 = 6.0°) and middle-late Miocene (Plat = 86.0°, Plong = 172.7°, K = 41.08, A95 = 3.8) palaeopole positions, calculated after tectonic corrections, are not statistically different from expected North American reference pole. Tectonic correction for Middle-late Miocene virtual geomagnetic poles plays an important role in reducing the resultant tilting from 2.7° to -0.8°. PI mean were calculated for Pliocene and middle-late Miocene periods at 29.2 ± 9.1 μT and 23.2 ± 6.3 μT, respectively. Compiling global filtered PI data, together with our results, indicates that the strength of the geomagnetic field during middle-late Miocene was weak (virtual dipole moment = 5.0 ± 2.2 × 1022 Am2) compared to Pliocene (6.4 ± 2.8 × 1022 Am2), and also relative to the present-day value (7.6 × 1022 Am2). This indicates the global nature of the low dipole moment during the middle-late Miocene period. However, issues related to the spatio-temporal distribution of PI data still present an obstacle to validating these suggestions; therefore, more reliable data are still needed.

A Study of Northwestern Mexico

1940 ◽  
Vol 30 (3) ◽  
pp. 513
Author(s):  
Edna Scofield ◽  
Gottfried Pfeifer
Keyword(s):  
Northwestern Mexico

Movement of nutrients in fungi. I. The Mycelium

1968 ◽  
Vol 16 (1) ◽  
pp. 71 ◽  
Author(s):  
LB Thrower ◽  
SL Thrower
Keyword(s):  
Nutrient Medium ◽  
Natural Habitat ◽  
Taxonomic Position ◽  
Deficient Medium ◽  
The Difference ◽  
Hyphal Apex

Thirty-one species of fungi (representing 13 orders) were examined for their ability to grow from a nutrient medium onto a non-nutrient medium; 17 were capable of colonizing the deficient medium, 10 were not, and 4 were indeterminate. The ability to grow onto deficient medium appeared to be related to the natural habitat of the fungus rather than to taxonomic position. Experiments with isotopically labelled nutrients showed that both colonizing fungi and non-colonizing fungi were capable of some transport of nutrients, the difference between the two groups being one of degree. In transporting fungi, labelled nutrients were moved more rapidly when the fungus colonized a deficient medium than when it colonized a nutrient medium; this suggested that movement of nutrients is adaptive to some extent. The importance of the growing hyphal apex as a sink for nutrients was demonstrated.

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