scholarly journals Exploring the Concept of Lineage Diversity across North American Forests

Forests ◽  
2019 ◽  
Vol 10 (6) ◽  
pp. 520 ◽  
Author(s):  
Kyle G. Dexter ◽  
Ricardo A. Segovia ◽  
Andy R. Griffiths
Keyword(s):  
United States ◽  
Pacific Northwest ◽  
North American ◽  
Conservation Priorities ◽  
Equal Weight ◽  
Eastern United States ◽  
Genetic Lineages ◽  
Southern Rocky Mountains ◽  
History Of ◽  
Lineage Diversity

Lineage diversity can refer to the number of genetic lineages within species or to the number of deeper evolutionary lineages, such as genera or families, within a community or assemblage of species. Here, we study the latter, which we refer to as assemblage lineage diversity (ALD), focusing in particular on its richness dimension. ALD is of interest to ecologists, evolutionary biologists, biogeographers, and those setting conservation priorities, but despite its relevance, it is not clear how to best quantify it. With North American tree assemblages as an example, we explore and compare different metrics that can quantify ALD. We show that both taxonomic measures (e.g., family richness) and Faith’s phylogenetic diversity (PD) are strongly correlated with the number of lineages in recent evolutionary time, but have weaker correlations with the number of lineages deeper in the evolutionary history of an assemblage. We develop a new metric, time integrated lineage diversity (TILD), which serves as a useful complement to PD, by giving equal weight to old and recent lineage diversity. In mapping different ALD metrics across the contiguous United States, both PD and TILD reveal high ALD across large areas of the eastern United States, but TILD gives greater value to the southeast Coastal Plain, southern Rocky Mountains and Pacific Northwest, while PD gives relatively greater value to the southern Appalachians and Midwest. Our results demonstrate the value of using multiple metrics to quantify ALD, in order to highlight areas of both recent and older evolutionary diversity.

scholarly journals Comparing Measures of Community Lineage Diversity across North American Forests

2019 ◽  
Author(s):  
Kyle G. Dexter ◽  
Ricardo A. Segovia ◽  
Andy Griffiths
Keyword(s):  
Species Richness ◽  
Pacific Northwest ◽  
North American ◽  
Conservation Priorities ◽  
Genetic Lineages ◽  
As Species ◽  
The Pacific ◽  
Tree Communities ◽  
Evolutionary Lineages ◽  
Lineage Diversity

Lineage diversity can refer to the number of genetic lineages within species or to the number of deeper evolutionary lineages, such as genera or families, within a community. Community lineage diversity (CLD) is of interest to ecologists, evolutionary biologists, biogeographers, and those setting conservation priorities. Despite its relevance, it is not clear how to best quantify CLD. With North American tree communities as an example, we test which taxonomic and phylogenetic metrics best measure CLD. We find that phylogenetic metrics outperform taxonomic metrics. Faith’s phylogenetic diversity performs well, but is skewed towards the number of lineages in recent time. The best metric is newly derived here, and termed time integrated lineage diversity (TILD). Mapping the lineage diversity of tree communities across the contiguous United States, we find a spatial pattern differing from that of species richness in key areas. The Pacific Northwest, Great Lakes Region, state of Maine, and south-eastern piedmont and coastal plain forests all emerge as areas high in lineage diversity, but relatively lower in species richness. We urge the consideration of lineage diversity, as well as species richness, when setting conservation priorities.

scholarly journals Comparing Measures of Community Lineage Diversity across North American Forests

2019 ◽  
Author(s):  
Kyle G. Dexter ◽  
Ricardo A. Segovia ◽  
Andy Griffiths
Keyword(s):  
Species Richness ◽  
Pacific Northwest ◽  
North American ◽  
Conservation Priorities ◽  
Genetic Lineages ◽  
As Species ◽  
The Pacific ◽  
Tree Communities ◽  
Evolutionary Lineages ◽  
Lineage Diversity

Lineage diversity can refer to the number of genetic lineages within species or to the number of deeper evolutionary lineages, such as genera or families, within a community. Community lineage diversity (CLD) is of interest to ecologists, evolutionary biologists, biogeographers, and those setting conservation priorities. Despite its relevance, it is not clear how to best quantify CLD. With North American tree communities as an example, we test which taxonomic and phylogenetic metrics best measure CLD. We find that phylogenetic metrics outperform taxonomic metrics. Faith’s phylogenetic diversity performs well, but is skewed towards the number of lineages in recent time. The best metric is newly derived here, and termed time integrated lineage diversity (TILD). Mapping the lineage diversity of tree communities across the contiguous United States, we find a spatial pattern differing from that of species richness in key areas. The Pacific Northwest, Great Lakes Region, state of Maine, and south-eastern piedmont and coastal plain forests all emerge as areas high in lineage diversity, but relatively lower in species richness. We urge the consideration of lineage diversity, as well as species richness, when setting conservation priorities.

scholarly journals The 2009 Late Blight Pandemic in the Eastern United States – Causes and Results

Plant Disease ◽  
2013 ◽  
Vol 97 (3) ◽  
pp. 296-306 ◽  
Author(s):  
W. E. Fry ◽  
M. T. McGrath ◽  
A. Seaman ◽  
T. A. Zitter ◽  
A. McLeod ◽  
...  
Keyword(s):  
United States ◽  
Late Blight ◽  
Phytophthora Infestans ◽  
Current Situation ◽  
Causal Agent ◽  
Community Supported Agriculture ◽  
Eastern United States ◽  
Tomato Crop ◽  
History Of ◽  
Mainstream Press

The tomato late blight pandemic of 2009 made late blight into a household term in much of the eastern United States. Many home gardeners and many organic producers lost most if not all of their tomato crop, and their experiences were reported in the mainstream press. Some CSAs (Community Supported Agriculture) could not provide tomatoes to their members. In response, many questions emerged: How did it happen? What was unusual about this event compared to previous late blight epidemics? What is the current situation in 2012 and what can be done? It's easiest to answer these questions, and to understand the recent epidemics of late blight, if one knows a bit of the history of the disease and the biology of the causal agent, Phytophthora infestans.

scholarly journals Long-term trends and drought: spatiotemporal variation in juvenile sex ratios of North American ducks

2021 ◽  
Author(s):  
Sage Ellis ◽  
Madeleine Lohman ◽  
James Sedinger ◽  
Perry Williams ◽  
Thomas Riecke
Keyword(s):  
United States ◽  
North American ◽  
Sex Ratios ◽  
Survival Rates ◽  
The United States ◽  
Avian Communities ◽  
Eastern United States ◽  
Bird Populations ◽  
Long Term Trends

Sex ratios affect population dynamics and individual fitness, and changing sex ratios can be indicative of shifts in sex-specific survival at different life stages. While climate- and landscape-change alter sex ratios of wild bird populations, long-term, landscape scale assessments of sex ratios are rare. Further, little work has been done to understand changes in sex ratios in avian communities. In this manuscript, we analyse long-term (1961-2015) data on five species of ducks across five broad climatic regions of the United States to estimate the effects of drought and long-term trends on the proportion of juvenile females captured at banding. As waterfowl have a 1:1 sex ratio at hatch, we interpret changes in sex ratios of captured juveniles as changes in sex-specific survival rates during early life. Seven of twelve species-region pairs exhibited evidence for long-term trends in the proportion of juvenile females at banding. The proportion of juvenile females at banding increased for duck populations in the western United States and typically declined for duck populations in the eastern United States. We only observed evidence for an effect of drought in two of the twelve species-region pairs, where the proportion of females declined during drought. As changes to North American landscapes and climate continue and intensify, we expect continued changes in sex-specific juvenile survival rates. More broadly, we encourage further research examining the mechanisms underlying long-term trends in juvenile sex ratios in avian communities.

Schools & the Diversity Transition

Daedalus ◽  
2013 ◽  
Vol 142 (3) ◽  
pp. 155-169 ◽  
Author(s):  
Richard Alba
Keyword(s):  
United States ◽  
Educational Policy ◽  
North American ◽  
The United States ◽  
Educational Systems ◽  
Policy Changes ◽  
Quarter Century ◽  
Abundant Evidence ◽  
Working Age ◽  
History Of

In the next quarter century, North American and Western European societies will face a profound transformation of their working-age populations as a result of immigration, combined with the aging of native majorities. These changes will intensify the challenges of integrating the children of lowstatus immigrants. Abundant evidence reveals that most educational systems, including that in the United States, are failing to meet these challenges; and sociological theories underscore these systems' role in reproducing inequality. However, the history of assimilation in the United States shows that native-/immigrant-origin inequalities need not be enduring. An examination of variations across time and space suggests educational policy changes and innovations that can ameliorate inequalities.

scholarly journals Verification of Extratropical Cyclones within the NCEP Operational Models. Part I: Analysis Errors and Short-Term NAM and GFS Forecasts

2009 ◽  
Vol 24 (5) ◽  
pp. 1173-1190 ◽  
Author(s):  
Michael E. Charles ◽  
Brian A. Colle
Keyword(s):  
United States ◽  
North America ◽  
North American ◽  
Eastern Pacific ◽  
Extratropical Cyclones ◽  
Global Forecast System ◽  
Eastern United States ◽  
Forecast System ◽  
Short Term ◽  
The North

Abstract This paper verifies extratropical cyclones around North America and the adjacent oceans within the National Centers for Environmental Prediction (NCEP) Global Forecast System (GFS) and North American Mesoscale (NAM) models during the 2002–07 cool seasons (October–March). The analyzed cyclones in the Global Forecast System (GFS) model, North American Mesoscale (NAM) model, and the North American Regional Reanalysis (NARR) were also compared against sea level pressure (SLP) observations around extratropical cyclones. The GFS analysis of SLP was clearly superior to the NAM and NARR analyses. The analyzed cyclone pressures in the NAM improved in 2006–07 when its data assimilation was switched to the Gridpoint Statistical Interpolation (GSI). The NCEP GFS has more skillful cyclone intensity and position forecasts than the NAM over the continental United States and adjacent oceans, especially over the eastern Pacific, where the NAM has a large positive (underdeepening) bias in cyclone central pressure. For the short-term (0–60 h) forecasts, the GFS and NAM cyclone errors over the eastern Pacific are larger than the other regions to the east. There are relatively large biases in cyclone position for both models, which vary spatially around North America. The eastern Pacific has four to eight cyclone events per year on average, with errors >10 mb at hour 48 in the GFS; this number has not decreased in recent years. There has been little improvement in the 0–2-day cyclone forecasts during the past 5 yr over the eastern United States, while there has been a relatively large improvement in the cyclone pressure predictions over the eastern Pacific in the NAM.

A REVISION OF THE NORTH AMERICAN OMALIINAE (COLEOPTERA: STAPHYLINIDAE): THE GENERA ARPEDIUM ERICHSON AND EUCNECOSUM REITTER

1984 ◽  
Vol 116 (4) ◽  
pp. 487-527 ◽  
Author(s):  
J. M. Campbell
Keyword(s):  
United States ◽  
North American ◽  
Biological Data ◽  
Eastern United States ◽  
European Species ◽  
Boreal Species ◽  
Line Drawings ◽  
The North ◽  
New Synonymy ◽  
Scanning Electron

AbstractThe North American species of the genera Arpedium Erichson, and Eucnecosum Reitter are revised. Five species are recognized, the holarctic species E. brachypterum (Gravenhorst), E. tenue (LeConte) and E. brunnescens (J. Sahlberg), the transcontinental boreal species A. cribratum Fauvel and the eastern United States species A. schwarzi Fauvel.Lectotypes are designated for E. brachypterum, A. cribratum, A. angulare Fauvel (= A. cribratum), and A. schwarzi. The following new synonymy is established, Arpedium norvegicum var. sallasi Munster and Eucnecosum meybohmi Lohse (= E. tenue) and Arpedium angulare Fauvel and A. columbiense Hatch (= A. cribratum). All genera and species are described and illustrated with scanning electron photomicrographs and line drawings, four maps showing the North American distribution of each species are provided, and keys are presented to aid in the identification of all the species as well as the European species Arpedium quadrum (Gravenhorst). All available records and biological data for the species are summarized.The use of the generic name Eucnecosum Reitter is discussed and the transfer of brachypterum, tenue, and brunnescens from Arpedium to this genus by Lohse is confirmed.

Anti-Catholicism in the United States

2016 ◽  
Author(s):  
Mark S. Massa
Keyword(s):  
United States ◽  
Cultural History ◽  
North American ◽  
The United States ◽  
Human Society ◽  
Boundary Maintenance ◽  
Different Types ◽  
History Of ◽  
American Society ◽  
American Catholic

Historian John Higham once referred to anti-Catholicism as “by far the oldest, and the most powerful of anti-foreign traditions” in North American intellectual and cultural history. But Higham’s famous observation actually elided three different types of anti-Catholic nativism that have enjoyed a long and quite vibrant life in North America: a cultural distrust of Catholics, based on an understanding of North American public culture rooted in a profoundly British and Protestant ordering of human society; an intellectual distrust of Catholics, based on a set of epistemological and philosophical ideas first elucidated in the English (Lockean) and Scottish (“Common Sense Realist”) Enlightenments and the British Whig tradition of political thought; and a nativist distrust of Catholics as deviant members of American society, a perception central to the Protestant mainstream’s duty of “boundary maintenance” (to utilize Emile Durkheim’s reading of how “outsiders” help “insiders” maintain social control). An examination of the long history of anti-Catholicism in the United States can be divided into three parts: first, an overview of the types of anti-Catholic animus utilizing the typology adumbrated above; second, a narrative history of the most important anti-Catholic events in U.S. culture (e.g., Harvard’s Dudleian Lectures, the Suffolk Resolves, the burning of the Charlestown convent, Maria Monk’s Awful Disclosures); and finally, a discussion of American Catholic efforts to address the animus.

Sign in / Sign up

Export Citation Format

Share Document