Evolution of Tertiary mammals of North America: v.2: Small mammals, xenarthrans, and marine mammals

2009 ◽  
Vol 46 (06) ◽  
pp. 46-3245-46-3245
Keyword(s):  
North America ◽  
Small Mammals ◽  
Marine Mammals

Trends in North American small mammals found in common barn-owl (Tyto alba) dietary studies

1991 ◽  
Vol 69 (12) ◽  
pp. 3093-3102 ◽  
Author(s):  
Donald R. Clark Jr. ◽  
Christine M. Bunck
Keyword(s):  
North America ◽  
Small Mammals ◽  
North American ◽  
Barn Owl ◽  
Annual Precipitation ◽  
Mean Annual Precipitation ◽  
Tyto Alba ◽  
Geographic Regions ◽  
Rats And Mice

Data on mammals were compiled from published studies of common barn-owl (Tyto alba) pellets. Mammalian composition of pellet samples was analyzed within geographic regions in regard to year, mean annual precipitation, latitude, and number of individual mammals in the sample. Percentages of individuals in pellets that were shrews increased whereas the percentages of rodents decreased with greater mean annual precipitation, especially in northern and western areas of North America. From the 1920s through 1980s, in northern and eastern areas the percentage of species that was shrews decreased, and in northern and central areas the percentage of individuals that was murid rats and mice increased. Human alterations of habitats during these seven decades are postulated to have caused changes in available small mammals, leading to changes in the barn-owl diet.

Extinct muskox and other additions to the Late Pleistocene Riddell Local Fauna, Saskatoon, Canada

1989 ◽  
Vol 26 (5) ◽  
pp. 881-893 ◽  
Author(s):  
T. Skwara ◽  
E. G. Walker
Keyword(s):  
Sexual Dimorphism ◽  
North America ◽  
Late Pleistocene ◽  
Small Mammals ◽  
Castor Canadensis ◽  
Local Fauna ◽  
Extinct Species ◽  
Ecological Requirements ◽  
Sand And Gravel ◽  
Gravel Deposit

Fossils recently recovered from the Riddell Member of the Floral Formation, a richly fossiliferous intertill sand and gravel deposit in the Saskatoon area, include taxa previously unknown from the Riddell Local Fauna and confirm the presence of others. Bootherium bombifrons (= Symbos cavifrons), represented by a well-preserved but incomplete skull, is new. Details of its preserved morphology support concepts of developmental variability and sexual dimorphism in the extinct species. Also new is the beaver, Castor canadensis, represented by an incomplete ulna. Additional fossils of horses indicate that at least two species, Equus niobrarensis, as well as the previously identified E. conversidens, were present. A Rancholabrean age (probably Rancholabrean II) for the fauna is confirmed by the presence of Bootherium bombifrons, a muskox known only from Illinoian and younger time in North America, but lithologic and stratigraphic relationships of tills and ecological requirements of the fauna limit the Riddell Member to the Sangamonian. Disharmonious associations of small mammals and high megafaunal diversity are consistent with the emerging picture of Pleistocene ecosystems as highly co-evolved and heterogeneous and without modern analogs.

A New Coating Treatment for Coniferous Seeds

1970 ◽  
Vol 46 (5) ◽  
pp. 406-408 ◽  
Author(s):  
Andrew Radvanyi
Keyword(s):  
North America ◽  
Aluminum Powder ◽  
Small Mammals ◽  
Seed Coating ◽  
Highly Effective ◽  
Coating Procedure ◽  
Forest Lands ◽  
Coating Formulation

Excessive loss of seeds to small mammals has long been considered a major cause of inadequate regeneration of cutover forest lands in North America. While numerous compounds, devices, and practices to minimize such losses have been tried, a fully acceptable and effective seed-coating procedure has not been developed. In the study reported, the widely used seed-coating formulation using endrin, arasan, aluminum powder, and latex is examined, and a new seed-coating formulation employing a highly effective rodent repellent is suggested.

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