ECOLOGICAL STUDY OF THE PEAT BOGS OF EASTERN NORTH AMERICA: II. THE CHAMAEDAPHNE CALYCULATA COMMUNITY IN QUEBEC AND ONTARIO

1955 ◽  
Vol 33 (6) ◽  
pp. 647-684 ◽  
Author(s):  
Fernando Segadas-Vianna
Keyword(s):  
North America ◽  
Ecological Study ◽  
Accurate Description ◽  
Peat Bogs ◽  
Eastern North America ◽  
Chamaedaphne Calyculata ◽  
Definition Of

Data collected in this very uniform bog community lend themselves particularly well to an assessment of phytosociological criteria. Expressions of frequency, constancy, fidelity, homogeneity as proposed by various writers are tested and evaluated. At the same time, it is believed that the present paper provides an accurate description and definition of the phytosociological unit with which it is concerned.

ECOLOGICAL STUDY OF THE PEAT BOGS OF EASTERN NORTH AMERICA: III. NOTES ON THE BEHAVIOR OF CHAMAEDAPHNE CALYCULATA

1956 ◽  
Vol 34 (1) ◽  
pp. 197-207 ◽  
Author(s):  
Kornelius Lems
Keyword(s):  
Ecological Study ◽  
The Other ◽  
Soil Conditions ◽  
Peat Bogs ◽  
Eastern North America ◽  
Physiological Basis ◽  
Chamaedaphne Calyculata ◽  
Different Types ◽  
The One ◽  
The Relationship

This paper presents data and observations concerning Chamaedaphne calyculata (L.) Moench. (Ericaceae). The branching pattern, the longevity of different types of leaves, and features of flowering are shown to be correlated. The relationship between this complex of features and the habitat is studied, and a few speculations are advanced to explain the physiological basis for the behavior of Chamaedaphne. This study is essentially autecological, and it is hoped that it may constitute a link between the study of soil conditions and the response of plant hormones on the one hand, and phytosociological work in peat bogs on the other hand.

ECOLOGICAL STUDY OF THE PEAT BOGS OF EASTERN NORTH AMERICA: I. STRUCTURE AND EVOLUTION OF VEGETATION

1952 ◽  
Vol 30 (4) ◽  
pp. 490-520 ◽  
Author(s):  
Pierre Dansereau ◽  
Fernando Segadas-Vianna
Keyword(s):  
North America ◽  
Ecological Study ◽  
Peat Bogs ◽  
Eastern North America ◽  
General Outline ◽  
Geographical Scale ◽  
Biological Aspects ◽  
The One ◽  
Principal Elements ◽  
Evolution Of Vegetation

It is attempted to clearly distinguish between bogs on the one hand and swamps and marshes on the other. The principal elements and factors are listed in Eastern North America where bogs are frequent. This first paper attempts a general outline of the dynamics of bog vegetation in this region and describes the structures of the communities involved. The biotope is considered the smallest piece in the association mosaic and its physical and biological aspects are emphasized. Two recent systems (Küchler's and Dansereau's) are applied to individualize the most important and widespread synecological units. Further studies involving climatic relationships on a geographical scale and phytosociological measurements at the quadrat level will permit a refocusing of some of the phenomena which are described and interpreted here.

Climacograptus pungens Ruedemann, 1904 and the definition of the Darriwilian (Ordovician) graptolite genus Archiclimacograptus Mitchell, 1987

2011 ◽  
Vol 48 (9) ◽  
pp. 1355-1367 ◽  
Author(s):  
Jörg Maletz
Keyword(s):  
New Species ◽  
North America ◽  
Current Status ◽  
Evolutionary Relationships ◽  
Eastern North America ◽  
Time Interval ◽  
The Pacific ◽  
Cladistic Analyses ◽  
Definition Of ◽  
A New Species

The genus Archiclimacograptus represents one of the earliest taxa of axonophoran graptolites with geniculate thecae, but its current status and evolutionary relationships are difficult to access even after a number of cladistic analyses have been executed. Archiclimacograptus? pungens (Ruedemann), a poorly known little species from the lower Darriwilian of eastern North America is interpreted as a possible member of the genus. The species belongs to a group of axonophorans with highly asymmetrical proximal end and pattern C astogeny, characterized by the lack of an apertural spine on th12, ranging from the Levisograptus dentatus Biozone (Darriwilian) to the Nemagraptus gracilis Biozone (Sandbian). Specimens are common in North America and the Argentinian Precordillera, but have not been reported from any Atlantic Faunal Realm localities. The distribution of the group indicates a restriction to the Pacific Faunal Realm, providing the earliest indication of a developing biogeographic differentiation of axonophoran graptolites after their origin in the oceanic biofacies during the Upper Dapingian to lower Darriwilian time interval. Archiclimacograptus? ambiguus is described as a new species.

The Identification and Study of Indian Shell Middens in Eastern North America: 1643–1861

1986 ◽  
Vol 6 (3) ◽  
pp. 227-243 ◽  
Author(s):  
Andrew L. Christenson
Keyword(s):  
Nineteenth Century ◽  
Civil War ◽  
North America ◽  
East Coast ◽  
Eastern North America ◽  
Shell Midden ◽  
Shell Middens ◽  
Work Done

Although the interest in shell middens in North America is often traced to reports of the discoveries in Danish kjoekkenmoeddings in the mid-nineteenth century, extensive shell midden studies were already occurring on the East Coast by that time. This article reviews selected examples of this early work done by geologists and naturalists, which served as a foundation for shell midden studies by archaeologists after the Civil War.

HAVE WE SEEN THE LARGEST EARTHQUAKES IN EASTERN NORTH AMERICA?

2018 ◽  
Author(s):  
James S. Neely ◽  
◽  
Seth Stein ◽  
Miguel Merino ◽  
John Adams
Keyword(s):  
North America ◽  
Eastern North America
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