scholarly journals Population genomic and historical analysis reveals a global invasion by bridgehead processes in Mimulus guttatus

2020 ◽  
Author(s):  
Mario Vallejo-Marín ◽  
Jannice Friedman ◽  
Alex D. Twyford ◽  
Olivier Lepais ◽  
Stefanie M. Ickert-Bond ◽  
...  
Keyword(s):  
North America ◽  
Biological Invasions ◽  
Historical Analysis ◽  
Historical Records ◽  
British Isles ◽  
Mimulus Guttatus ◽  
Negative Effects ◽  
Introduced Populations ◽  
Starting Point ◽  
Global Invasion

AbstractHumans are transforming species ranges worldwide. While artificial translocations trigger biological invasions with negative effects on biodiversity, invasions provide exceptional opportunities to generate ecological and evolutionary hypotheses. Unfortunately, imperfect historical records and exceedingly complex demographic histories present challenges for the reconstruction of invasion histories. Here we combine historical records, extensive worldwide and genome-wide sampling, and demographic analyses to investigate the global invasion of yellow monkeyflowers (Mimulus guttatus) from North America to Europe and the Southwest Pacific. By sampling 521 plants from 158 native and introduced populations genotyped at >44,000 loci, we determined that invasive North American M. guttatus was first likely introduced to the British Isles from the Aleutian Islands (Alaska), followed by rapid admixture from multiple parts of the native range. Populations in the British Isles then appear to have served as a bridgehead for vanguard invasions worldwide into the rest of Europe, New Zealand and eastern North America. Our results emphasise the highly admixed nature of introduced M. guttatus and demonstrate the potential of introduced populations to serve as sources of secondary admixture, producing novel hybrids. Unravelling the history of biological invasions provides a starting point to understand how invasive populations adapt to novel environments.

scholarly journals Population genomic and historical analysis suggests a global invasion by bridgehead processes in Mimulus guttatus

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Mario Vallejo-Marín ◽  
Jannice Friedman ◽  
Alex D. Twyford ◽  
Olivier Lepais ◽  
Stefanie M. Ickert-Bond ◽  
...  
Keyword(s):  
Biological Invasions ◽  
Historical Analysis ◽  
Historical Records ◽  
British Isles ◽  
Mimulus Guttatus ◽  
Introduced Populations ◽  
Genome Wide ◽  
Starting Point ◽  
History Of ◽  
Global Invasion

AbstractImperfect historical records and complex demographic histories present challenges for reconstructing the history of biological invasions. Here, we combine historical records, extensive worldwide and genome-wide sampling, and demographic analyses to investigate the global invasion of Mimulus guttatus from North America to Europe and the Southwest Pacific. By sampling 521 plants from 158 native and introduced populations genotyped at >44,000 loci, we determined that invasive M. guttatus was first likely introduced to the British Isles from the Aleutian Islands (Alaska), followed by admixture from multiple parts of the native range. We hypothesise that populations in the British Isles then served as a bridgehead for vanguard invasions worldwide. Our results emphasise the highly admixed nature of introduced M. guttatus and demonstrate the potential of introduced populations to serve as sources of secondary admixture, producing novel hybrids. Unravelling the history of biological invasions provides a starting point to understand how invasive populations adapt to novel environments.

The genesis of international mass migration

2018 ◽  
Author(s):  
Eric Richards
Keyword(s):  
North America ◽  
Structural Changes ◽  
British Isles ◽  
Scottish Highlands ◽  
Isle Of Man ◽  
Mass Migration ◽  
Large Numbers ◽  
Starting Point ◽  
The Common ◽  
Over Time

Very large numbers of people began to depart the British Isles for the New Worlds after about 1770. This was a pioneering movement, a rehearsal for modern international migration. This book contends that emigration history is not seamless, that it contains large shifts over time and place, and that the modern scale and velocity of mobility have very particular historical roots. The Isle of Man is an ideal starting point in the quest for the engines and mechanisms of emigration, and a particular version of the widespread surge in British emigration in the 1820s. West Sussex was much closer to the centres of the expansionary economy in the new age. North America was the earliest and the greatest theatre of oceanic emigration in which the methods of mass migration were pioneered. Landlocked Shropshire experienced some of the earliest phases of British industrialisation, notably in the Ironbridge/Coalbrookdale district, deep inland on the River Severn. The turmoil in the agrarian and demographic foundations of life reached across the British archipelago. In West Cork and North Tipperary, there was clear evidence of the great structural changes that shook the foundations of these rural societies. The book also discusses the sequences and effects of migration in Wales, Swaledale, Cornwall, Kent, London, and Scottish Highlands. It also deals with Ireland’s place in the more generic context of the origins of migration from the British Isles. The common historical understanding is that the pre-industrial population of the British Isles had been held back by Malthusian checks.

scholarly journals Combining genetic and distributional approaches to sourcing introduced species: a case study on the Nile monitor ( Varanus niloticus ) in Florida

2016 ◽  
Vol 3 (4) ◽  
pp. 150619
Author(s):  
Stephanie A. Dowell ◽  
Jared P. Wood ◽  
Todd S. Campbell ◽  
Sergios-Orestis Kolokotronis ◽  
Evon R. Hekkala
Keyword(s):  
North America ◽  
Coastal Region ◽  
The United States ◽  
Species Range ◽  
Sub Saharan Africa ◽  
Source Population ◽  
Ecological Niche Models ◽  
Negative Effects ◽  
Full Species ◽  
Introduced Populations

Three separate breeding populations of the Nile monitor ( Varanus niloticus ) have been identified in Florida, USA, located in Cape Coral, West Palm Beach and Homestead Air Reserve Base. This large, predatory lizard could have negative effects on Florida's native wildlife. Here, we infer the source of the introduced populations using genetic and statistical approaches, as well as estimate the potential non-native distribution of V. niloticus in North America. We collected genetic data from 25 Florida individuals as well as utilized genetic datasets from reference individuals spanning the full native distribution throughout sub-Saharan Africa. Using occurrence data from the inferred source population and the full species range, we built ecological niche models (ENMs) and projected them onto North America to determine regions with suitable climate. Our results indicated that the introduced populations resulted from three separate introduction events, and all originated from the southern coastal region of West Africa. The ENM built from the West African source population predicted only the southernmost portions of North America to be suitable. Conversely, the model derived from the full species’ range predicted suitable climates across a large portion of the United States. This information can be used to focus management and eradication efforts.

scholarly journals Geocomputing, New Technologies and Historical Analysis: Tools for a Changing Planet

Proceedings ◽  
2019 ◽  
Vol 30 (1) ◽  
pp. 9
Author(s):  
Sebastiano Trevisani
Keyword(s):  
Quantitative Analysis ◽  
Philosophy Of Science ◽  
New Technologies ◽  
Historical Analysis ◽  
Holistic Approach ◽  
Research Topic ◽  
The Other ◽  
Historical Records ◽  
The Earth ◽  
The Relationship

Modern Earth Scientists need also to interact with other disciplines, apparently far from the Earth Sciences and Engineering. Disciplines related to history and philosophy of science are emblematic from this perspective. From one side, the quantitative analysis of information extracted from historical records (documents, maps, paintings, etc.) represents an exciting research topic, requiring a truly holistic approach. On the other side, epistemological and philosophy of science considerations on the relationship between geoscience and society in history are of fundamental importance for understanding past, present and future geosphere-anthroposphere interlinked dynamics.

scholarly journals Globalization Impact on Multinational Enterprises

World ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 216-230
Author(s):  
Justine Kyove ◽  
Katerina Streltsova ◽  
Ufuoma Odibo ◽  
Giuseppe T. Cirella
Keyword(s):  
Developing Country ◽  
Multinational Enterprises ◽  
Developed Countries ◽  
Global Market ◽  
Data Availability ◽  
Negative Effects ◽  
Developed Country ◽  
Excellent Starting Point ◽  
Starting Point ◽  
The Impact

The impact of globalization on multinational enterprises was examined from the years 1980 to 2020. A scoping literature review was conducted for a total of 141 articles. Qualitative, quantitative, and mixed typologies were categorized and conclusions were drawn regarding the influence and performance (i.e., positive or negative effects) of globalization. Developed countries show more saturated markets than developing countries that favor developing country multinational enterprises to rely heavily on foreign sales for revenue growth. Developed country multinationals are likely to use more advanced factors of production to create revenue, whereas developing country multinationals are more likely to use less advanced forms. A number of common trends and issues showed corporate social responsibility, emerging markets, political issues, and economic matters as key to global market production. Recommendations signal a strong need for more research that addresses contributive effects in the different economies, starting with the emerging to the developed. Limitations of data availability and inconsistency posed a challenge for this review, yet the use of operationalization, techniques, and analyses from the business literature enabled this study to be an excellent starting point for additional work in the field.

Processing of Information about Location during Locomotion: Effects of Amount of Visual Information about the Locomotor Patterns

1980 ◽  
Vol 51 (1) ◽  
pp. 231-238 ◽  
Author(s):  
Anders Böök ◽  
Tommy Gärling
Keyword(s):  
Visual Information ◽  
Concurrent Task ◽  
Negative Effects ◽  
Impaired Performance ◽  
Central Processing ◽  
Starting Point ◽  
Light Line ◽  
Locomotor Patterns ◽  
Dark Room

How maintenance of orientation during locomotion in unfamiliar environments is accomplished was investigated by presenting subjects ( n = 32) a target in different locations in a dark room, having them walk linearly behind a moving light line (1.12 m/sec.), and from a stopping point 12 and 22.6 m away, numerically estimate direction and distance to the target. An equal number of subjects was assigned to each of 2 × 2 treatment levels: the starting point either visible or invisible from the stopping point and the target either visible only from the starting point or throughout each trial. In the conditions with invisible targets there were mainly negative effects of the visible starting point, partially the same as those previously obtained for a concurrent task during locomotion. The results suggested that maintenance of orientation is achieved by recurrent central processing of information, which if postponed leads to impaired performance mainly because forgetting occurs.

Evangelicalism: Comparative Studies of Popular Protestantism in North America, the British Isles, and Beyond, 1700-1990.

1995 ◽  
Vol 82 (1) ◽  
pp. 199
Author(s):  
Frank Lambert ◽  
Mark A. Noll ◽  
David W. Bebbington ◽  
George A. Rawlyk
Keyword(s):  
North America ◽  
Comparative Studies ◽  
British Isles

scholarly journals The economics of merger appraisal: analysis of best practices

2019 ◽  
pp. 60-67
Author(s):  
V. Pruzhansky
Keyword(s):  
Cost Savings ◽  
Structural Factors ◽  
Barriers To Entry ◽  
Negative Effects ◽  
Market Shares ◽  
Starting Point ◽  
Customer Switching ◽  
The Us ◽  
Buyer Power ◽  
Merger Remedies

The article briefly outlines key economic principles that are used for merger appraisal in Europe and the US. We consider three most typical cases: horizontal, vertical and conglomerate mergers. We explain the main positive and negative effects that typically arise in each case. We point that the analysis of structural factors (levels of industry concentration and market shares) and barriers to entry can serve only as a starting point of the merger appraisal process. Other indicators such as closeness of competition, countervailing buyer power and customer switching, counter-reactions of rivals, levels of profitability, cost savings are far more important for the analysis of merger effects on consumers and competition. In addition, we describe general economic principles with regards to merger remedies.

scholarly journals The genome sequence of the grape phylloxera provides insights into the evolution, adaptation, and invasion routes of an iconic pest

BMC Biology ◽  
2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Claude Rispe ◽  
Fabrice Legeai ◽  
Paul D. Nabity ◽  
Rosa Fernández ◽  
Arinder K. Arora ◽  
...  
Keyword(s):  
North America ◽  
Mississippi River ◽  
Grape Phylloxera ◽  
The Past ◽  
Plant Feeding ◽  
Metabolic Genes ◽  
Effector Genes ◽  
Genetic Stocks ◽  
Invasion Routes ◽  
Global Invasion

Abstract Background Although native to North America, the invasion of the aphid-like grape phylloxera Daktulosphaira vitifoliae across the globe altered the course of grape cultivation. For the past 150 years, viticulture relied on grafting-resistant North American Vitis species as rootstocks, thereby limiting genetic stocks tolerant to other stressors such as pathogens and climate change. Limited understanding of the insect genetics resulted in successive outbreaks across the globe when rootstocks failed. Here we report the 294-Mb genome of D. vitifoliae as a basic tool to understand host plant manipulation, nutritional endosymbiosis, and enhance global viticulture. Results Using a combination of genome, RNA, and population resequencing, we found grape phylloxera showed high duplication rates since its common ancestor with aphids, but similarity in most metabolic genes, despite lacking obligate nutritional symbioses and feeding from parenchyma. Similarly, no enrichment occurred in development genes in relation to viviparity. However, phylloxera evolved > 2700 unique genes that resemble putative effectors and are active during feeding. Population sequencing revealed the global invasion began from the upper Mississippi River in North America, spread to Europe and from there to the rest of the world. Conclusions The grape phylloxera genome reveals genetic architecture relative to the evolution of nutritional endosymbiosis, viviparity, and herbivory. The extraordinary expansion in effector genes also suggests novel adaptations to plant feeding and how insects induce complex plant phenotypes, for instance galls. Finally, our understanding of the origin of this invasive species and its genome provide genetics resources to alleviate rootstock bottlenecks restricting the advancement of viticulture.

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