scholarly journals Contrasting environmental factors drive local adaptation at opposite ends of an environmental gradient in the yellow monkeyflower ( Mimulus guttatus )

2020 ◽  
Vol 107 (2) ◽  
pp. 298-307 ◽  
Author(s):  
Damian Popovic ◽  
David B. Lowry
Keyword(s):  
Environmental Factors ◽  
Local Adaptation ◽  
Environmental Gradient ◽  
Mimulus Guttatus

scholarly journals Oceanic salt spray and herbivore pressure contribute to local adaptation of coastal perennial and inland annual ecotypes of the Seep Monkeyflower (Mimulus guttatus)

2019 ◽  
Author(s):  
Damian Popovic ◽  
David B. Lowry
Keyword(s):  
Environmental Factors ◽  
Local Adaptation ◽  
Environmental Gradient ◽  
Salt Spray ◽  
Transplant Experiment ◽  
Mimulus Guttatus ◽  
Coastal Habitat ◽  
Reciprocal Transplant Experiment ◽  
Selective Agents ◽  
Herbivore Pressure

ABSTRACTIdentifying the environmental factors responsible for natural selection across different habitats is crucial for understanding the process of local adaptation. Despite its importance, only a few studies have successfully isolated the environmental factors driving local adaptation in nature. In this study, we evaluated the agents of selection responsible local adaptation of the monkeyflower Mimulus guttatus to coastal and inland habitats in California. We implemented a manipulative field reciprocal transplant experiment at coastal and inland sites, where we excluded aboveground stressors in an effort to elucidate their role in the evolution of local adaptation. We found that excluding these stressors, most likely a combination of salt spray and herbivory, completely rescued inland plant fitness when transplanted to coastal habitat. In contrast, the exclosures in inland habitat provided limited fitness benefit for either coastal or inland plants. We have previously established that low soil water availability belowground is the most important agent of selection in inland habitat. Therefore, our study demonstrates that a distinct set of selective agents are responsible for local adaptation at opposite ends of an environmental gradient.

scholarly journals Influence of environmental factors on the genetic variation of the aquatic macrophyte Ranunculus subrigidus on the Qinghai-Tibetan Plateau

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Zhigang Wu ◽  
Xinwei Xu ◽  
Juan Zhang ◽  
Gerhard Wiegleb ◽  
Hongwei Hou
Keyword(s):  
Genetic Diversity ◽  
Tibetan Plateau ◽  
Environmental Factors ◽  
Local Adaptation ◽  
Aquatic Macrophyte ◽  
Spatial Genetic Structure ◽  
Long Distance ◽  
Elevation Gradients ◽  
Mantel Tests ◽  
Genetic Patterns

Abstract Background Due to the environmental heterogeneity along elevation gradients, alpine ecosystems are ideal study objects for investigating how ecological variables shape the genetic patterns of natural species. The highest region in the world, the Qinghai-Tibetan Plateau, is a hotspot for the studies of evolutionary processes in plants. Many large rivers spring from the plateau, providing abundant habitats for aquatic and amphibious organisms. In the present study, we examined the genetic diversity of 13 Ranunculus subrigidus populations distributed throughout the plateau in order to elucidate the relative contribution of geographic distance and environmental dissimilarity to the spatial genetic pattern. Results A relatively low level of genetic diversity within populations was found. No spatial genetic structure was suggested by the analyses of molecular variance, Bayesian clustering analysis and Mantel tests. Partial Mantel tests and multiple matrix regression analysis showed a significant influence of the environment on the genetic divergence of the species. Both climatic and water quality variables contribute to the habitat heterogeneity of R. subrigidus populations. Conclusions Our results suggest that historical processes involving long-distance dispersal and local adaptation may account for the genetic patterns of R. subrigidus and current environmental factors play an important role in the genetic differentiation and local adaptation of aquatic plants in alpine landscapes.

scholarly journals Local adaptation mediated niche expansion in correlation with genetic richness

2021 ◽  
Author(s):  
Masaomi Kurokawa ◽  
Issei Nishimura ◽  
Bei-Wen YING
Keyword(s):  
Escherichia Coli ◽  
Local Adaptation ◽  
High Throughput ◽  
Experimental Evolution ◽  
Environmental Gradient ◽  
Growth Curves ◽  
Quantitative Relationship ◽  
Central Issue ◽  
Wild Type ◽  
Niche Expansion

As a central issue in evolution and ecology, the quantitative relationship among the genome, adaptation and the niche was investigated. Local adaptation of five Escherichia coli strains carrying either the wild-type genome or reduced genomes was achieved by experimental evolution. A high-throughput fitness assay of the ancestor and evolved populations across an environmental gradient of eight niches resulted in a total of 80 fitness curves generated from 2,220 growth curves. Further analyses showed that the increases in both local adaptiveness and niche broadness were negatively correlated with genetic richness. Local adaptation caused common niche expansion, whereas niche expansion for generality or speciality was decided by genetic richness. The order of the mutations accumulated stepwise was correlated with the magnitude of the fitness increase attributed to mutation accumulation. Pre-adaptation probably participated in coordination among genetic richness, local adaptation and niche expansion.

scholarly journals The role of gene flow asymmetry along an environmental gradient in constraining local adaptation and range expansion

2012 ◽  
Vol 25 (8) ◽  
pp. 1676-1685 ◽  
Author(s):  
K. M. FEDORKA ◽  
W. E. WINTERHALTER ◽  
K. L. SHAW ◽  
W. R. BROGAN ◽  
T. A. MOUSSEAU
Keyword(s):  
Gene Flow ◽  
Local Adaptation ◽  
Range Expansion ◽  
Environmental Gradient ◽  
Flow Asymmetry

Is local adaptation in Mimulus guttatus caused by trade-offs at individual loci?

2010 ◽  
Vol 19 (13) ◽  
pp. 2739-2753 ◽  
Author(s):  
M. C. HALL ◽  
D. B. LOWRY ◽  
J. H. WILLIS
Keyword(s):  
Local Adaptation ◽  
Mimulus Guttatus ◽  
Trade Offs

scholarly journals Ecological Gradient Analysis and Environmental Interpretation of Cyclocarya paliurus Communities

Forests ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 146
Author(s):  
Caowen Sun ◽  
Yongsheng Zhou ◽  
Shengzuo Fang ◽  
Xulan Shang
Keyword(s):  
Environmental Factors ◽  
Tree Species ◽  
Environmental Gradient ◽  
Gradient Analysis ◽  
Mixed Forest ◽  
Importance Value ◽  
Ecological Gradient ◽  
Cyclocarya Paliurus ◽  
Environmental Interpretation ◽  
Species Importance

Cyclocarya paliurus (Batal.) Iljinsk. is mainly distributed in the subtropical areas of China. The leaves of this species are rich in beneficial secondary metabolites exhibiting bioactivity against human diseases, including hyperlipemia, diabetes, and hypertension. To explore the adaptability and distribution characteristics along the environmental gradient of this species, investigation of the characteristics of C. paliurus communities is necessary. In this study, we established 31 sample plots, each 20 m × 20 m, and comparatively analyzed the species composition, species importance value, and tree species diversity of different C. paliurus communities in 2 years. Canonical correspondence analyses were carried out: the first between tree-species importance value and 12 environmental factors, and the second between C. paliurus population-related indices and the 12 environmental factors. On the basis of these analyses, we identified tree species varying markedly in abundance in the studied C. paliurus communities. Several tree species showed adaptive characteristics similar to those of C. paliurus. We also observed that the C. paliurus importance value varied along elevational, longitudinal, and temperature gradients. Our findings should be valuable for prediction of C. paliurus adaptive areas and mixed forest afforestation in different distribution areas.

scholarly journals Separate the wheat from the chaff: genomic scan for local adaptation in the red coralCorallium rubrum

2018 ◽  
Author(s):  
M. Pratlong ◽  
A. Haguenauer ◽  
K. Brener ◽  
G. Mitta ◽  
E. Toulza ◽  
...  
Keyword(s):  
Local Adaptation ◽  
Environmental Gradient ◽  
Environmental Gradients ◽  
High Rate ◽  
Corallium Rubrum ◽  
Red Coral ◽  
Geographical Regions ◽  
Adaptive Processes ◽  
Tests Of Association ◽  
Candidate Loci

ABSTRACTGenomic data allow an in-depth and renewed study of local adaptation. The red coral (Corallium rubrum, Cnidaria) is a highly genetically structured species and a promising model for the study of adaptive processes along an environmental gradient. Here, we used RAD-Sequencing in order to study the vertical genetic structure of this species and to search for signals of local adaptation to depth and thermal regime in the red coral. Previous studies have shown different thermotolerance levels according to depth in this species which could correspond to genetic or environmental differences. We designed a sampling scheme with six pairs of ‘shallow vs deep’ populations distributed in three geographical regions as replicates. Our results showed significant differentiation among locations and among sites separated by around 20 m depth. The tests of association between genetics and environment allowed the identification of candidate loci under selection but with a potentially high rate of false positive. We discuss the methodological obstacles and biases encountered for the detection of selected loci in such a strongly genetically structured species. On this basis, we also discuss the significance of the candidate loci for local adaptation detected in each geographical region and the evolution of red coral populations along environmental gradients.A colony of red coral,Corallium rubrum, near Marseille. Photo: F. Zuberer / OSU Pythéas / CNRS

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