scholarly journals Effect of Climatic Conditions and Land Cover on Genetic Structure and Diversity of Eunica tatila (Lepidoptera) in the Yucatan Peninsula, Mexico

Diversity ◽  
2018 ◽  
Vol 10 (3) ◽  
pp. 79 ◽  
Author(s):  
Laura Cavanzón-Medrano ◽  
Salima Machkour-M’Rabet ◽  
Landy Chablé-Iuit ◽  
Carmen Pozo ◽  
Yann Hénaut ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Tropical Forest ◽  
Yucatan Peninsula ◽  
Climatic Conditions ◽  
Habitat Characteristics ◽  
Fragmented Landscape ◽  
Model Species ◽  
Yucatán Peninsula ◽  
The Impact

Fragmentation is the third cause of the biodiversity declination. Population genetic studies using Lepidoptera as the model species in the context of loss of habitat are scarce, particularly for tropical areas. We chose a widespread butterfly from Mexico as the model species to explore how changes of habitat characteristics (undisturbed forest, anthropogenic disturbances, and coastal areas), and climatic conditions affect genetic diversity and population structure. The Nymphalidae Eunica tatila is a common species in the Yucatan Peninsula considered to be a bio-indicator of undisturbed tropical forest, with migratory potential and a possible sex-biased dispersal. We genotyped 323 individuals collected in eight undisturbed areas, using four Inter Simple Sequence Repeats primers. Results show a high genetic diversity and no population structure. Temperature and shrub density present a positive and significant relationship with polymorphism values. Furthermore, our results show the positive effect of surrounding forest habitat on genetic diversity, confirming that E. tatila is a bio-indicator of undisturbed tropical forest. We found evidence of sex-biased dispersal. This paper represents one of the few studies on population genetics of tropical butterfly in a fragmented landscape and is, therefore, an important step in understanding the impact of habitat fragmentation on the risk of a butterflies’ decline.

The Impact of Hurricane Gilbert on Trees, Litterfall, and Woody Debris in a Dry Tropical Forest in the Northeastern Yucatan Peninsula

Biotropica ◽  
1991 ◽  
Vol 23 (4) ◽  
pp. 434 ◽  
Author(s):  
Dennis F. Whigham ◽  
Ingrid Olmsted ◽  
Edgar Cabrera Cano ◽  
Mark E. Harmon
Keyword(s):  
Tropical Forest ◽  
Woody Debris ◽  
Yucatan Peninsula ◽  
Dry Tropical Forest ◽  
Yucatán Peninsula ◽  
The Impact

scholarly journals Structure and Genetic Diversity of Nine Important Landraces of Capsicum Species Cultivated in the Yucatan Peninsula, Mexico

Agronomy ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 376 ◽  
Author(s):  
Lucero del C. López Castilla ◽  
René Garruña Hernández ◽  
Crescencio de la Cruz Castillo Aguilar ◽  
Aida Martínez-Hernández ◽  
Matilde Margarita Ortiz-García ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Relationships ◽  
Yucatan Peninsula ◽  
Conservation Status ◽  
Sustainable Use ◽  
Issr Markers ◽  
Southern Mexico ◽  
Yucatán Peninsula ◽  
Capsicum Spp ◽  
Capsicum Species

Mexico has a wealth of Capsicum species, which has led to the development of a large number of chili pepper landraces. A great wealth of Capsicum germplasm can be found in southern Mexico in the Yucatan Peninsula, an important area of diversification of Capsicum annuum. Specifically, in the western Yucatan Peninsula, three of the five domesticated species of Capsicum (C. annuum, C. chinense and C. frutescens) have been reported. However, information on their genetic diversity, conservation status and potential use is lacking. To generate useful information toward the sustainable use, management and conservation of these species, we evaluated the structure, diversity and genetic relationships of nine accessions of Capsicum spp., of major importance cultivated in the western Yucatan Peninsula using 42 ISSR loci. The results indicated that these accessions consisted of three genetic groups that were defined by the respective species of each accession. The level of genetic diversity was moderate and distributed mainly among accessions. The ISSR markers detected a high level of polymorphism and allowed the genetic differentiation of the C. annuum complex. The results indicated that the accessions collected in the western Yucatan Peninsula constitute a valuable genetic resource that can be used in genetic improvement and conservation programs.

scholarly journals Characterization of Flowpath Using Geochemistry and 87Sr/86Sr Isotope Ratios in the Yalahau Region, Yucatan Peninsula, Mexico

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2587
Author(s):  
Jessica McKay ◽  
Melissa Lenczewski ◽  
Rosa Maria Leal-Bautista
Keyword(s):  
Yucatan Peninsula ◽  
Isotope Ratios ◽  
Water Withdrawal ◽  
Flow Paths ◽  
Major Ion ◽  
Yucatán Peninsula ◽  
Major Ion Geochemistry ◽  
The Impact ◽  
Yalahau Region

The Yalahau region, located in the northeastern portion of the Yucatán Peninsula, hosts a series of elongated depressions trending north/south in the direction of Isla Holbox, identified as the Holbox Fracture Zone. Previous studies have explored the geomorphology and various hydrologic characteristics of the Yucatán Peninsula; however, there is a paucity of data concerning the interior region where the fractures are located. Strontium isotope ratios and major ion geochemistry data of the surface water and groundwater of this region serve as a hydrogeochemical fingerprint, aiding in constraining the hydrological boundaries, determining flow paths, and characterizing hydrogeochemical processes that impact the composition of the groundwater within the region. 87Sr/86Sr isotope ratios indicate a different signature than the surrounding bedrock Sr ratio, suggesting that the flow throughout the Yalahau region is moving through channels faster than that of much of the Yucatán. Through major ion geochemistry and 87Sr/86Sr isotope ratios, we were able to delineate at least two flow paths within the Yalahau region and identify a point of saline intrusion at least 35 km from the coast. Gaining an understanding of the hydrogeochemistry and water flow regions is crucial in determining the impact of various activities (e.g., extensive tourism, drinking water withdrawal, wastewater discharge/injection) that occur within the Yucatán Peninsula.

scholarly journals Population Structure of Rhododendron Campanulatum D. Don and Associated Tree Species along the Elevational Gradient of Manaslu Conservation Area, Nepal

2016 ◽  
Vol 21 (1) ◽  
pp. 95-102
Author(s):  
Prabina Rana ◽  
Madan Koirala ◽  
Dinesh Raj Bhuju ◽  
Chuenchit Boonchird
Keyword(s):  
Climate Change ◽  
Population Structure ◽  
Altitudinal Gradient ◽  
Elevational Gradient ◽  
Climatic Conditions ◽  
Importance Value Index ◽  
Importance Value ◽  
Conservation Area ◽  
The Impact ◽  
Rhododendron Campanulatum

Climate change is affecting the forest ecosystems worldwide. Impacts of climate change are more perceptible at higher altitudes and can be easily detected along the elevational gradient. The main aim is to study the impact of elevation on the population structure of Rhododendron campanulatum D. Don and associated trees species at Manaslu Conservation Area, central Nepal. A total of 30 quadrats were sampled from 3600-4100 meter above sea level (m asl.) at altitudinal difference of 100 m with 5 quadrates in each altitude. The present study showed that R. campanulatum, Betula utilis, Abies spectabilis and Sorbus microphylla are the treeline species. R. campanulatum was the most dominant species with highest importance value index (IVI) along the altitudinal gradient. At 4000 m asl. S. microphylla was the codominant species. B. utilis was the codominant species at 3600 -3900 m asl followed by S. microphylla and A. spectabilis. R. campanulatum and A. spectabilis showed a sustainable regeneration. No seedling of B. utilis was found along the altitudinal gradient indicating that the regeneration of this species might be affected by unfavourable micohabitat (eg. deep shade). R. campanulatum and S. microphylla were found above the treeline indicating that the climatic conditions were favourable for their growth. The height, diameter and density of the species differed along the elevational gradient and showed a species specific trend. Journal of Institute of Science and TechnologyVol. 21, No. 1, 2016, page: 

Genetic diversity and population structure in a collection of roselle (Hibiscus sabdariffaL.) from Niger

2013 ◽  
Vol 12 (2) ◽  
pp. 207-214 ◽  
Author(s):  
Y. Bakasso ◽  
M. Zaman-Allah ◽  
C. Mariac ◽  
C. Billot ◽  
Y. Vigouroux ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Fragment Length Polymorphism ◽  
Genetic Groups ◽  
Diversity Assessment ◽  
Farmer Management ◽  
Morphological Differences ◽  
Close Relatives ◽  
The Impact ◽  
100 Seed Weight

Roselle (Hibiscus sabdariffaL.) is an economically important plant in Niger. Little is known about its genetic diversity and population structure. In this study, we performed the first diversity assessment of a collection of 124 roselle accessions and 16 accessions of its close relativesHibiscuscannabinusandAbelmoschusesculentus. Our study was based on ten agromorphological traits and 267 amplified fragment length polymorphism markers. We identified two major distinct groups inH. sabdariffausing a Bayesian method. These two genetic groups were associated with statistical differences for three phenological characteristics: number of days to flowering, 100-seed weight and calyx size. However, the calyx colour, i.e. a morphological characteristic often used to classify different local ecotypes, did not superimpose this separation. Our findings suggested that roselle diversity is genetically structured; the two different groups were clearly associated with morphological differences but were not commonly used by farmers for their classification. The impact of the perceived ecotype structure and its consequence on farmer management is discussed.

scholarly journals Coexistence of jaguars (Panthera onca) and pumas (Puma concolor) in a tropical forest in south–eastern Mexico

2020 ◽  
pp. 55-66
Author(s):  
D. M. Ávila–Nájera ◽  
C. Chávez ◽  
S. Pérez–Elizalde ◽  
J. Palacios–Pérez ◽  
B. Tigar
Keyword(s):  
Habitat Use ◽  
Tropical Forest ◽  
Puma Concolor ◽  
Yucatan Peninsula ◽  
Activity Patterns ◽  
Time Of Day ◽  
Peak Activity ◽  
Occupancy Models ◽  
Panthera Onca ◽  
Yucatán Peninsula

The biological ranges of the jaguar (Panthera onca) and puma (Puma concolor) overlap in the Yucatan Peninsula, corresponding to the most important population of jaguars in Mexico. The goal of this study in the El Eden Ecological Reserve (EER) was to investigate the factors that permit these two predators to coexist in the dense vegetation of medium–stature tropical forest and secondary forest in the north–eastern Yucatan Peninsula. We assessed their spatial and temporal overlap using Pianka’s index, and evaluated their habitat use by applying occupancy models. A total sampling effort of 7,159 trap–nights over 4 years produced 142 independent photographic records of jaguars, and 134 of pumas. The felids showed high to very high overlap in their use of different vegetation (0.68–0.99) and trail types (0.63–0.97) and in their activity patterns (0.81–0.90). However, their peak activity patterns showed some temporal separation. Time of day, particularly for peak activity time, was the best predictor to explain the coexistence of the felids in this habitat. While occupancy models showed that the presence of potential prey species and vegetation type could predict the presence of felids in the study area. Natural disturbances during 2010 (hurricane) and 2011 (fire) drastically changed habitat use and activity patterns, resulting in pumas and jaguars adjusting their resource–use and activity pattern through a strategy of mutual evasion.

scholarly journals Genetic diversity and population structure of Alternaria species from tomato and potato in North Carolina and Wisconsin

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tika B. Adhikari ◽  
Norman Muzhinji ◽  
Dennis Halterman ◽  
Frank J. Louws
Keyword(s):  
Genetic Diversity ◽  
North Carolina ◽  
Population Structure ◽  
Genetic Variation ◽  
Dna Sequences ◽  
Random Mating ◽  
Population Expansion ◽  
The United States ◽  
Population Subdivision ◽  
The Impact

AbstractEarly blight (EB) caused by Alternaria linariae or Alternaria solani and leaf blight (LB) caused by A. alternata are economically important diseases of tomato and potato. Little is known about the genetic diversity and population structure of these pathogens in the United States. A total of 214 isolates of A. alternata (n = 61), A. linariae (n = 96), and A. solani (n = 57) were collected from tomato and potato in North Carolina and Wisconsin and grouped into populations based on geographic locations and tomato varieties. We exploited 220 single nucleotide polymorphisms derived from DNA sequences of 10 microsatellite loci to analyse the population genetic structure between species and between populations within species and infer the mode of reproduction. High genetic variation and genotypic diversity were observed in all the populations analysed. The null hypothesis of the clonality test based on the index of association $$\left( {\overline{r}_{d} } \right)$$ r ¯ d was rejected, and equal frequencies of mating types under random mating were detected in some studied populations of Alternaria spp., suggesting that recombination can play an important role in the evolution of these pathogens. Most genetic differences were found between species, and the results showed three distinct genetic clusters corresponding to the three Alternaria spp. We found no evidence for clustering of geographic location populations or tomato variety populations. Analyses of molecular variance revealed high (> 85%) genetic variation within individuals in a population, confirming a lack of population subdivision within species. Alternaria linariae populations harboured more multilocus genotypes (MLGs) than A. alternata and A. solani populations and shared the same MLG between populations within a species, which was suggestive of gene flow and population expansion. Although both A. linariae and A. solani can cause EB on tomatoes and potatoes, these two species are genetically differentiated. Our results provide new insights into the evolution and structure of Alternaria spp. and can lead to new directions in optimizing management strategies to mitigate the impact of these pathogens on tomato and potato production in North Carolina and Wisconsin.

scholarly journals Genetic Diversity and Population Structure Analysis of Triticum aestivum L. Landrace Panel from Afghanistan

Genes ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 340
Author(s):  
Muhammad Massub Tehseen ◽  
Deniz Istipliler ◽  
Zakaria Kehel ◽  
Carolina P. Sansaloni ◽  
Marta da Silva Lopes ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Genetic Distance ◽  
Bread Wheat ◽  
Structure Analysis ◽  
Geographic Origin ◽  
Climatic Conditions ◽  
Population Structure Analysis ◽  
North Eastern ◽  
Wheat Landraces

Landraces are a potential source of genetic diversity and provide useful genetic resources to cope with the current and future challenges in crop breeding. Afghanistan is located close to the centre of origin of hexaploid wheat. Therefore, understanding the population structure and genetic diversity of Afghan wheat landraces is of enormous importance in breeding programmes for the development of high-yielding cultivars as well as broadening the genetic base of bread wheat. Here, a panel of 363 bread wheat landraces collected from seven north and north-eastern provinces of Afghanistan were evaluated for population structure and genetic diversity using single nucleotide polymorphic markers (SNPs). The genotyping-by-sequencing of studied landraces after quality control provided 4897 high-quality SNPs distributed across the genomes A (33.75%), B (38.73%), and D (27.50%). The population structure analysis was carried out by two methods using model-based STRUCTURE analysis and cluster-based discriminant analysis of principal components (DAPC). The analysis of molecular variance showed a higher proportion of variation within the sub-populations compared with the variation observed as a whole between sub-populations. STRUCTURE and DAPC analysis grouped the majority of the landraces from Badakhshan and Takhar together in one cluster and the landraces from Baghlan and Kunduz in a second cluster, which is in accordance with the micro-climatic conditions prevalent within the north-eastern agro-ecological zone. Genetic distance analysis was also studied to identify differences among the Afghan regions; the strongest correlation was observed for the Badakhshan and Takhar (0.003), whereas Samangan and Konarha (0.399) showed the highest genetic distance. The population structure and genetic diversity analysis highlighted the complex genetic variation present in the landraces which were highly correlated to the geographic origin and micro-climatic conditions within the agro-climatic zones of the landraces. The higher proportions of admixture could be attributed to historical unsupervised exchanges of seeds between the farmers of the central and north-eastern provinces of Afghanistan. The results of this study will provide useful information for genetic improvement in wheat and is essential for association mapping and genomic prediction studies to identify novel sources for resistance to abiotic and biotic stresses.

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