Invasion of the exotic cladoceran Daphnia lumholtzi into North American reservoirs

1995 ◽  
Vol 52 (1) ◽  
pp. 151-160 ◽  
Author(s):  
John E. Havel ◽  
William R. Mabee ◽  
John R. Jones
Keyword(s):  
United States ◽  
Population Dynamics ◽  
North America ◽  
North American ◽  
Late Summer ◽  
Southern United States ◽  
Daphnia Lumholtzi ◽  
Distributional Patterns ◽  
History Of

Daphnia lumholtzi, a large cladoceran native to Africa, Asia, and Australia, has recently invaded reservoirs of the southern United States. We examined its distribution, history of invasion, and population dynamics in Missouri reservoirs. Surveys detected the species in 7 of 112 reservoirs in 1992 and 11 of 119 reservoirs in 1993. Analysis of quantitative zooplankton samples from two reservoirs over a 7-year period indicated that D. lumholtzi first reached detectable densities in 1990 and persisted during 1991–1993. Population maxima typically occurred in late summer, with the species absent from the plankton during winter and spring. Based on its current distributional patterns, D. lumholtzi appears to be capable of colonizing most reservoirs in the southern regions of North America.

Introduction

2020 ◽  
pp. 1-22
Author(s):  
Frank Towers
Keyword(s):  
United States ◽  
Nineteenth Century ◽  
North America ◽  
North American ◽  
The United States ◽  
Political Order ◽  
Nation State ◽  
History Of ◽  
Key Terms ◽  
The U.S

Today’s political map of North America took its basic shape in a continental crisis in the 1860s, marked by Canadian Confederation (1867), the end of the U.S. Civil War (1865), the restoration of the Mexican Republic (1867), and numerous wars and treaty regimes conducted between these states and indigenous peoples through the 1870s. This volume explores the tumultuous history of North American state-making in the mid-nineteenth century from a continental perspective that seeks to look across and beyond the traditional nation-centered approach. This introduction orients readers by first exploring the meaning of key terms—in particular sovereignty and its historical attachment to the concept of the nation state—and then previewing how contributors interrogate different themes of the mid-century struggles that remade the continent’s political order. Those themes fall into three main categories: the character of the states made and remade in the mid-1800s; the question of sovereignty for indigenous polities that confronted the European-settler descended governments of Canada, Mexico, and the United States; and the interaction between capitalist expansion and North American politics, and the concomitant implications of state making for sovereignty’s more diffuse meaning at the level of individual and group autonomy.

NOTES ON SOME TROPICAL NOCTUIDS IN NORTH AMERICA

1937 ◽  
Vol 69 (10) ◽  
pp. 218-219
Author(s):  
A. Glenn Richards
Keyword(s):  
United States ◽  
North America ◽  
North American ◽  
Southern United States ◽  
Tropical Species ◽  
The North

The following notes are written to place on record certain authentic records of tropical species taken in the southern United States. Most of these species are not at present recorded in the North American lists. Unless otherwise stated all specimens are in the author's collection.

scholarly journals Les relations canado-américaines : Nationalisme et continentalisme

2005 ◽  
Vol 14 (1) ◽  
pp. 23-37 ◽  
Author(s):  
Louis Balthazar
Keyword(s):  
United States ◽  
North America ◽  
Manifest Destiny ◽  
The United States ◽  
Cultural Integration ◽  
British North America ◽  
History Of ◽  
Canadian Nationalism ◽  
Set Up ◽  
National Perspective

This paper's objective is to bring forth some elements which confirm the following hypothesis : Canada is consigned to continentalism, namely to economic and cultural integration with the United States though this fact is shrouded in a Canadian nationalism of sorts. The continentalist mentality is rooted in the history of British North America, inhabited mostly by refugees from America who have remained inherently "Yankees" in spite of their anti-americanism. The Confederation itself is based on a sort of complicity with the United States. More recently there were talks of a "North American nationality", and continentalism both cultural and economic has come to be seen as a 'force of nature" which the governments, at the most, put into a chanelling process. Still, it is possible for Canadian nationalism to exist provided it does not go beyond the threshold whence it would run headlong into the continental mentality. Canada has defined itself through an international or non-national perspective far too long for today's nationalism not to remain weak and poorly established. But the Americans whose "manifest destiny" has succeeded in spreading over Canada without even their having tried to hoist their flag there find it to their advantage to maintain some form of Canadian sovereignty. Canada as a "friendly nation" can be of use to Washington. That is why there are almost as many advocates for Canada's independence in the United States as there are north of the border. Canadian nationalism can thus further the interests of some Canadian elites without seriously prejudicing continental integration which can very well afford not to be set up into formalized structures.

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.

Black Farmers, Agriculture, and Resistance

2018 ◽  
pp. 3-27
Author(s):  
Monica M. White
Keyword(s):  
United States ◽  
Civil Rights ◽  
Collective Agency ◽  
Southern United States ◽  
Agricultural Cooperatives ◽  
Universal Negro Improvement Association ◽  
Food And Agriculture ◽  
Black Farmers ◽  
History Of ◽  
Prefigurative Politics

Most accounts of African Americans’ relationship to the soil focus on oppression and exploitation. This book offers the untold history of Black farmers’ fight to stay on the land in the southern United States, using agricultural cooperatives as a basis for resistance and community self-determination. This chapter introduces slave gardens as resistance, the Colored Farmers Alliance, the Universal Negro Improvement Association, and food and agriculture in the civil rights and Black Power movements as precursors to the examples of black agricultural cooperatives in Freedom Farmers. These cooperatives demonstrate what White calls collective agency and community resilience, using the primary strategies of prefigurative politics, economic autonomy, and commons as praxis. The archival, ethnographic, and interview-based methods of the book are grounded in the African principle of sankofa: investigating the past to understand the present as a basis of forging a future of our own making.

Conclusion

2021 ◽  
pp. 217-220
Author(s):  
Candace Bailey
Keyword(s):  
United States ◽  
Civil War ◽  
Social Status ◽  
Southern United States ◽  
Southern Women ◽  
Satisfactory Explanation ◽  
Women's Music ◽  
History Of ◽  
And Gender ◽  
The Impact

This history of women’s music in the southern United States—one taking into account regional practices—offers new perspectives into class, social aspirations, and gender; it differs substantially from composer-centric narratives. It is the first study to interrogate the impact of the Civil War on women’s music—how it affected repertory, performance circumstances, and careers. The dissimilar women examined here prove that a single, fixed signifier, such as cultural class, social status, parlor music, or domesticity cannot sufficiently account for southern women’s music practices. Gentility provides a more satisfactory explanation by allowing a nuanced examination of southern women—both white and of color—and their musicking.

AIR-BORNE POLLEN SURVEYS IN BRITISH COLUMBIA

1967 ◽  
Vol 47 (3) ◽  
pp. 251-261 ◽  
Author(s):  
I. J. Bassett ◽  
C. W. Crompton
Keyword(s):  
United States ◽  
British Columbia ◽  
North America ◽  
Late Summer ◽  
The United States ◽  
Early Spring ◽  
Causative Agents ◽  
Early Fall ◽  
Trees And Shrubs

Results from 17 pollen collecting stations in British Columbia indicate that air-borne pollen of ragweeds and their relatives, the principal causative agents of hay fever in North America, is practically absent throughout the province. Coniferous trees and shrubs such as pines, spruces, firs, cedars, Douglas fir, hemlocks and junipers produce the greater part of the air-borne pollen from March to early July. Pollen from alders, poplars, willows and birches is also prevalent in some areas in the early spring. The peak periods of grass pollen near the United States–Canadian border occur mainly in June and the early part of July, while further north they are about a month later. Of the four types of plantain pollen identified from the different collecting stations, English plantain was the most common, especially in the southwesterly part of the province. Pollen from the lambs’-quarters and amaranth families and wormwoods occurs mainly in the late summer and early fall and is more abundant in the dry interior than along the coast.

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