Twenty-five year population trends in Northern Saw-whet Owl (Aegolius acadicus) in eastern North America

2021 ◽  
Vol 132 (3) ◽  
Author(s):  
Jennifer Wall ◽  
David Brinker ◽  
Scott Weidensaul ◽  
David Okines ◽  
Pascal Côté ◽  
...  
Keyword(s):  
North America ◽  
Population Trends ◽  
Eastern North America ◽  
Aegolius Acadicus

PARASITOIDS OF ENDEMIC AND EPIDEMIC POPULATIONS OF CHORISTONEURA OCCIDENTALIS FREEMAN AND CHORISTONEURA RETINIANA (WALSINGHAM) (LEPIDOPTERA: TORTRICIDAE) IN SOUTHERN OREGON

1991 ◽  
Vol 123 (5) ◽  
pp. 1095-1102 ◽  
Author(s):  
Willis C. Schaupp ◽  
W. Jan A. Volney ◽  
William E. Waters
Keyword(s):  
North America ◽  
Quantitative Estimation ◽  
Host Density ◽  
Population Trends ◽  
Eastern North America ◽  
Choristoneura Occidentalis ◽  
Parasitoid Species ◽  
Choristoneura Retiniana ◽  
Parasite Complex

AbstractParasitoid species attacking sparse, endemic populations of Choristoneura occidentalis Freeman and C. retiniana (Walsingham) are reported from 2 years of host collections at seven sites across southern Oregon. Results are compared with rearings from epidemic populations either from the same region or the same plot. Collections were designed to allow quantitative estimation of host density. Most of the parasitoid species present during epidemics across North America were recovered from the endemic and epidemic populations studied. The major difference is that at endemic host densities Glypta fumiferanae (Viereck) (Ichneumonidae) is rare to absent, whereas ichneumonids of the tribe Campoplegini, especially Tranosema (= Diadegma) interruptum (Ashmead), are common. This is the reverse of the situation at epidemic densities and consistent with results reported from eastern North America. It is suggested that the observed shift in the parasite complex with budworm density has the potential for predicting population trends.

Population trends and interactions among terns and gulls in Gros Morne National Park, Newfoundland

1993 ◽  
Vol 71 (8) ◽  
pp. 1516-1520 ◽  
Author(s):  
Lesley-Anne Howes ◽  
William A. Montevecchi
Keyword(s):  
North America ◽  
National Park ◽  
Management Strategies ◽  
Population Trends ◽  
Eastern North America ◽  
Sterna Hirundo ◽  
Local Production ◽  
Common Terns

Although populations of Common Terns and Arctic Terns (Sterna hirundo, S. paradisaea) have been decreasing and gull (Larus spp.) populations have been increasing in eastern North America for more than 50 years, little is known about the population trends of these species in Newfoundland. Here we present data, spanning two decades, on the population trends and interactions of terns and gulls on five islands in Gros Morne National Park in western Newfoundland. Tern populations in this region are increasing despite interactions with gulls and low productivity. Immigration from disturbed colonies elsewhere is suggested as a possible source of the increase. Gull populations have also increased substantially since the early 1970s and closely follow local production of fisheries offal, as indicated by landing trends in the area. Implications for gull management strategies are discussed.

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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