Feeding Ecology and Its Relationship with Head Structures in Two Populations of the Lizard Sceloporus minor (Squamata: Phrynosomatidae) from Northern Mexico

Copeia ◽  
2019 ◽  
Vol 107 (3) ◽  
pp. 542 ◽  
Author(s):  
María Concepción Puga y Colmenares ◽  
Aurelio Ramírez-Bautista ◽  
Raciel Cruz-Elizalde ◽  
Aaron García-Rosales ◽  
Uriel Hernández-Salinas
Keyword(s):  
Feeding Ecology ◽  
Northern Mexico ◽  
Sceloporus Minor ◽  
Two Populations

scholarly journals Poliembrionía en maices de porte normal y enano.

2016 ◽  
Vol 9 (2) ◽  
pp. 83 ◽  
Author(s):  
José Espinoza ◽  
Cristina Vega ◽  
Enrique Navarro ◽  
Gustavo A. Burciaga
Keyword(s):  
Recurrent Selection ◽  
Unit Area ◽  
Selection Response ◽  
Base Population ◽  
Normal Height ◽  
Northern Mexico ◽  
Founding Population ◽  
Maize Populations ◽  
Reproduction Management ◽  
Two Populations

The Mexican Maize Institute, in Saltillo, Northern Mexico, has developed maize populations with polyembryonic traits. Polyembryony (PE) is interesting for at least two reasons: two or more embryos per seed can produce more oil and embryo protein, as well as savings in the number of seeds necessary to reach a certain population per unit area. The founding population (established in 1973) had 1.5% of PE, identified as "twin plants" by seed. Starting in 1975 different recurrent selection schemes have been applied in order to increase the PE frequency. By 1991 the selection response placed PE at 47%; then the base population was divided into two groups: brachytic and normal height. By 1996 these two populations showed a PE frequency above 60%. For the last 5 years, reproduction management of polyembryonic groups has been made through parental crosses with a mixture of pollen. Between 200 and 250 halfsib families (SHS) were selected in a given cycle in the field in each group; each SHS is represented by 50 seeds, which were individually planted and kept under greenhouse conditions. The families to be transplanted were selected from these according to their PE proportion and at least 75% germination. PE increase seems to limit seed germination to an average lower than 90% under greenhouse conditions, and lower than 60% under direct planting.

Comparison of Principal Component Solutions in Two Populations

Methodology ◽  
2016 ◽  
Vol 12 (1) ◽  
pp. 11-20 ◽  
Author(s):  
Gregor Sočan
Keyword(s):  
Simulation Study ◽  
Principal Components ◽  
Common Factor ◽  
Principal Component ◽  
Component Model ◽  
Bootstrap Procedure ◽  
Factor Loadings ◽  
Component Loadings ◽  
Principal Component Model ◽  
Two Populations

Abstract. When principal component solutions are compared across two groups, a question arises whether the extracted components have the same interpretation in both populations. The problem can be approached by testing null hypotheses stating that the congruence coefficients between pairs of vectors of component loadings are equal to 1. Chan, Leung, Chan, Ho, and Yung (1999) proposed a bootstrap procedure for testing the hypothesis of perfect congruence between vectors of common factor loadings. We demonstrate that the procedure by Chan et al. is both theoretically and empirically inadequate for the application on principal components. We propose a modification of their procedure, which constructs the resampling space according to the characteristics of the principal component model. The results of a simulation study show satisfactory empirical properties of the modified procedure.

A new type of phytotherapeutic approach with angiosperms from arid zones of northern Mexico in patients with malignant and benign tumors

Planta Medica ◽  
2009 ◽  
Vol 75 (09) ◽  
Author(s):  
CA López-Moreno ◽  
LR Quintanilla ◽  
GLB Serrano ◽  
QE Rosales ◽  
FJA Pérez ◽  
...  
Keyword(s):  
Benign Tumors ◽  
Arid Zones ◽  
Northern Mexico ◽  
New Type ◽  
Malignant And Benign Tumors

Molecular phylogeny and taxonomic evaluation of the genus Asaccus Dixon and Anderson, 1973 (Reptilia: Phyllodactylidae) in Iran

2020 ◽  
pp. 207-214
Author(s):  
Akbar Fattahi
Keyword(s):  
Molecular Phylogeny ◽  
Nuclear Gene ◽  
Genetic Distances ◽  
Genetic Lineage ◽  
New Taxon ◽  
Zagros Mountains ◽  
Relict Species ◽  
Taxonomical Revision ◽  
Two Populations ◽  
Taxonomic Evaluation

The Iranian species of the phyllodactylid geckos of the genus Asaccus are found only in the valleys of the Zagros Mountains, a region which represents an important area of endemism in western Iran. Recently, many relict species have been described from the central and southern parts of the Zagros Mountains, which were previously known as A. elisae. The recent descriptions of species within this complex suggest that diversity within the genus may be higher than expected and that its taxonomy and systematics should be revised. In the present study, phylogenetic relationships within the genus Asaccus were evaluated using two mitochondrial and one nuclear gene. Genetically, the genus shows high levels of variability. The molecular phylogeny of the genus suggests the presence of three main clades along the Zagros Mountains with the southern population (from the Hormozgan province) and one clade (A. sp8 and A. sp9) being sister taxon to A. montanus from UAE. The remaining samples are separated into two reciprocally monophyletic groups: the northern (Kurdistan, Kermanshah and Ilam provinces) and the central (Lorestan, Khuzestan, Kohgilouye-Bouyer Ahmad and Fars provinces) Zagros groups. The results of the present study suggest that populations attributed to A. elisae in Iran correspond to distinct lineages with high genetic distances. In brief, our results suggest that the genus needs a major taxonomical revision The Arabian origin of the genus has not been confirmed, because two populations from Zagros were located within the A. montanus, A. gallagheri and A. platyrhynchus clade. Further morphological analyses are needed to systematically define each genetic lineage as a new taxon.

Influence of fisheries on the spatio-temporal feeding ecology of gulls along the western Iberian coast

2020 ◽  
Author(s):  
JG Calado ◽  
SN Veríssimo ◽  
VH Paiva ◽  
R Ramos ◽  
PT Vaz ◽  
...  
Keyword(s):  
Feeding Ecology ◽  
Spatio Temporal

Deep-sea fish assemblages (300-2100 m) in the eastern Pacific off northern Mexico

2018 ◽  
Vol 592 ◽  
pp. 225-242 ◽  
Author(s):  
E Cruz-Acevedo ◽  
N Tolimieri ◽  
H Aguirre-Villaseñor
Keyword(s):  
Deep Sea ◽  
Fish Assemblages ◽  
Eastern Pacific ◽  
Northern Mexico ◽  
Sea Fish

Comparing Genetic Variation within Red Winter Wheat Populations with and without Image-Based Optical Sorter Selection

2019 ◽  
Vol 9 (2) ◽  
pp. 266-277
Author(s):  
Hussein M. Khaeim ◽  
Anthony Clark ◽  
Tom Pearson ◽  
Dr. David Van Sanford
Keyword(s):  
Genetic Variation ◽  
Fusarium Head Blight ◽  
Heading Date ◽  
Fusarium Head Blight Resistance ◽  
Gibberella Zeae ◽  
Mass Selection ◽  
Head Blight ◽  
Red Winter Wheat ◽  
Two Populations ◽  
Head Scab

Head scab is historically a devastating disease affecting not just all classes of wheat but also barley and other small grains around the world. Fusarium head blight (FHB), or head scab, is caused most often by Fusarium graminearum (Schwabe), (sexual stage – Gibberella zeae) although several Fusarium spp. can cause the disease. This study was conducted to determine the effect of mass selection for FHB resistance using an image-based optical sorter. lines were derived from the C0 and C2 of two populations to compare genetic variation within populations with and without sorter selection. Our overall hypothesis is that sorting grain results in improved Fusarium head blight resistance. Both of the used wheat derived line populations have genetic variation, and population 1 has more than population 17. They are significantly different from each other for fusarium damged kernel (FDK), deoxynivalenol (DON), and other FHB traits. Although both populations are suitable to be grown for bulks, population 1 seems better since it has more genetic variation as well as lower FDK and DON, and earlier heading date. Lines within each population were significantly different and some lines in each population had significantly lower FDK and DON after selection using an optical sorter. Some lines had significant reduction in both FDK and DON, and some others had either FDK or DON reduction. Lines of population 1 that had significant reduction, were more numerous than in population 17, and FDK and DON reduction were greater.

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