Minimum population of American Oystercatchers Haematopus palliatus frazari wintering in northwestern Mexico

Wader Study ◽  
2018 ◽  
Vol 125 (1) ◽  
Author(s):  
Roberto Carmona ◽  
Victor Ayala-Pérez ◽  
Nallely Arce ◽  
José Alfredo Castillo-Guerrero ◽  
Cynthia Carmona Islas ◽  
...  
Keyword(s):  
Haematopus Palliatus ◽  
Northwestern Mexico

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.

Breeding biology of the American Oystercatcher Haematopus palliatus on a key site for conservation in southern Brazil

2021 ◽  
Vol 29 (1) ◽  
pp. 16-21
Author(s):  
Bruno de Andrade Linhares ◽  
Juçara Bordin ◽  
Guilherme Tavares Nunes ◽  
Paulo Henrique Ott
Keyword(s):  
Breeding Biology ◽  
Southern Brazil ◽  
American Oystercatcher ◽  
Haematopus Palliatus

A Study of Northwestern Mexico

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

The loading history of trace metals and nutrients in Altata-Ensenada del Pabellón, lagoon complex, northwestern Mexico

2003 ◽  
Vol 69 (1-2) ◽  
pp. 129-143 ◽  
Author(s):  
A.C. Ruiz-Fernández ◽  
F. Páez-Osuna ◽  
M. Soto-Jiménez ◽  
C. Hillaire-Marcel ◽  
B. Ghaleb
Keyword(s):  
Trace Metals ◽  
Loading History ◽  
History Of ◽  
Northwestern Mexico
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