Long-term copper mine waste disposal in northern Chile associated with gene flow disruption of the intertidal kelp Lessonia nigrescens

Archaeologically defined inter-group differences in the Northeast subarea ate assessed with a phenetic analysis of published craniometric information. Spatial distinctions in the material culture are in good agreement with those defined by the cranial metrics. The fundamental dichotomy, between the Ontario Iroquois and the eastern grouping of New York and New England, suggests a long-term dissociation between these two groups relative to their ecologic adaptations, trade relationships, trait-list associations, and natural and cultural barriers to gene flow.

Download Full-text

Population fragmentation causes inadequate gene flow and increases extinction risk

10.1093/oso/9780198783398.003.0005 ◽

2017 ◽

Author(s):

Richard Frankham ◽

Jonathan D. Ballou ◽

Katherine Ralls ◽

Mark D. B. Eldridge ◽

Michele R. Dudash ◽

...

Keyword(s):

Gene Flow ◽

Extinction Risk ◽

Random Mating ◽

Large Population ◽

Isolated Population ◽

Population Fragmentation ◽

Single Population ◽

Total Size ◽

Limited Gene Flow

Most species now have fragmented distributions, often with adverse genetic consequences. The genetic impacts of population fragmentation depend critically upon gene flow among fragments and their effective sizes. Fragmentation with cessation of gene flow is highly harmful in the long term, leading to greater inbreeding, increased loss of genetic diversity, decreased likelihood of evolutionary adaptation and elevated extinction risk, when compared to a single population of the same total size. The consequences of fragmentation with limited gene flow typically lie between those for a large population with random mating and isolated population fragments with no gene flow.

Download Full-text

Prediction of Genetic Contributions and Generation Intervals in Populations With Overlapping Generations Under Selection

Genetics ◽

10.1093/genetics/151.3.1197 ◽

1999 ◽

Vol 151 (3) ◽

pp. 1197-1210 ◽

Cited By ~ 3

Author(s):

Piter Bijma ◽

John A Woolliams

Keyword(s):

Gene Flow ◽

Overlapping Generations ◽

Selective Advantage ◽

Turnover Time ◽

Breeding Value ◽

Age Classes ◽

Generation Interval ◽

Young Parents ◽

Genetic Contributions

Abstract A method to predict long-term genetic contributions of ancestors to future generations is studied in detail for a population with overlapping generations under mass or sib index selection. An existing method provides insight into the mechanisms determining the flow of genes through selected populations, and takes account of selection by modeling the long-term genetic contribution as a linear regression on breeding value. Total genetic contributions of age classes are modeled using a modified gene flow approach and long-term predictions are obtained assuming equilibrium genetic parameters. Generation interval was defined as the time in which genetic contributions sum to unity, which is equal to the turnover time of genes. Accurate predictions of long-term genetic contributions of individual animals, as well as total contributions of age classes were obtained. Due to selection, offspring of young parents had an above-average breeding value. Long-term genetic contributions of youngest age classes were therefore higher than expected from the age class distribution of parents, and generation interval was shorter than the average age of parents at birth of their offspring. Due to an increased selective advantage of offspring of young parents, generation interval decreased with increasing heritability and selection intensity. The method was compared to conventional gene flow and showed more accurate predictions of long-term genetic contributions.

Download Full-text

Substantial gene flow caused by long‐term translocation between natural bank populations of the Peruvian scallop ( Argopecten purpuratus ) is supported by RAD‐Seq analyses

Journal of the World Aquaculture Society ◽

10.1111/jwas.12795 ◽

2021 ◽

Author(s):

Ximena Velez‐Zuazo ◽

Sergio P. Barahona ◽

Omar G. Melo ◽

Eric Hanschke ◽

Ian Hanschke ◽

...

Keyword(s):

Gene Flow ◽

Argopecten Purpuratus

Download Full-text

Expected Genetic Contributions and Their Impact on Gene Flow and Genetic Gain

Genetics ◽

10.1093/genetics/153.2.1009 ◽

1999 ◽

Vol 153 (2) ◽

pp. 1009-1020 ◽

Cited By ~ 4

Author(s):

J A Woolliams ◽

P Bijma ◽

B Villanueva

Keyword(s):

Gene Flow ◽

Genetic Gain ◽

Overlapping Generations ◽

Predictive Accuracy ◽

Index Theory ◽

Previous Theory ◽

Selection Indices ◽

Breeding Groups ◽

Genetic Contributions

Abstract Long-term genetic contributions (ri) measure lasting gene flow from an individual i. By accounting for linkage disequilibrium generated by selection both within and between breeding groups (categories), assuming the infinitesimal model, a general formula was derived for the expected contribution of ancestor i in category q (μi(q)), given its selective advantages (si(q)). Results were applied to overlapping generations and to a variety of modes of inheritance and selection indices. Genetic gain was related to the covariance between ri and the Mendelian sampling deviation (ai), thereby linking gain to pedigree development. When si(q) includes ai, gain was related to E[μi(q)ai], decomposing it into components attributable to within and between families, within each category, for each element of si(q). The formula for μi(q) was consistent with previous index theory for predicting gain in discrete generations. For overlapping generations, accurate predictions of gene flow were obtained among and within categories in contrast to previous theory that gave qualitative errors among categories and no predictions within. The generation interval was defined as the period for which μi(q), summed over all ancestors born in that period, equaled 1. Predictive accuracy was supported by simulation results for gain and contributions with sib-indices, BLUP selection, and selection with imprinted variation.

Download Full-text

Introgression between non-sister species of honeyeaters (Aves: Meliphagidae) several million years after speciation

Biological Journal of the Linnean Society ◽

10.1093/biolinnean/blz129 ◽

2019 ◽

Vol 128 (3) ◽

pp. 583-591

Author(s):

Leo Joseph ◽

Alex Drew ◽

Ian J Mason ◽

Jeffrey L Peters

Keyword(s):

Gene Flow ◽

Reproductive Isolation ◽

Sex Chromosomes ◽

Common Ancestor ◽

Sister Species ◽

Species Boundaries ◽

North Eastern ◽

The City

Abstract We reassessed whether two parapatric non-sister Australian honeyeater species (Aves: Meliphagidae), varied and mangrove honeyeaters (Gavicalis versicolor and G. fasciogularis, respectively), that diverged from a common ancestor c. 2.5 Mya intergrade in the Townsville area of north-eastern Queensland. Consistent with a previous specimen-based study, by using genomics methods we show one-way gene flow for autosomal but not Z-linked markers from varied into mangrove honeyeaters. Introgression barely extends south of the area of parapatry in and around the city of Townsville. While demonstrating the long-term porosity of species boundaries over several million years, our data also suggest a clear role of sex chromosomes in maintaining reproductive isolation.

Download Full-text

Predicting long-term contamination potential of perched groundwater in a mine-waste heap using a random-walk method

Hydrogeology Journal ◽

10.1007/s10040-007-0243-4 ◽

2008 ◽

Vol 16 (3) ◽

pp. 447-459 ◽

Cited By ~ 3

Author(s):

Catherine J. Gandy ◽

Paul L. Younger

Keyword(s):

Random Walk ◽

Mine Waste ◽

Random Walk Method

Download Full-text

Research on Dust Suppression of a Copper Mine Underground Middle Level Crushing Station

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.726-731.907 ◽

2013 ◽

Vol 726-731 ◽

pp. 907-912

Author(s):

Zong Yin Duan

Keyword(s):

High Pressure ◽

Middle Level ◽

Dust Concentration ◽

Dust Suppression ◽

Copper Mine ◽

Safety And Health

With long-term mining and new orebodies proved to be in the deep, the dust concentration of each mine underground operation site increased sharply, which is a serious threat to safety and health of workers in workspace. In this paper, a high pressure spray technology was put forward for dedusting on a mine underground middle crushing station[, and achieved the desired dedusting effect.

Download Full-text