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Full-Text Articles in Life Sciences
Dragonflies At The Uwm Cedar-Sauk Field Station, Tom Pleyte
Dragonflies At The Uwm Cedar-Sauk Field Station, Tom Pleyte
Field Station Bulletins
When visitors and classes utilize the Field Station facilities during the summer months, they seldom fail to notice dragonflies coursing the old fields or hawking mosquitoes over the little ponds. Their beauty and strong powers of flight have long fascinated observers, but few casual on-lookers are aware of the number of species present at the Field Station and the complexity of their behavior and annual cycles. This report will attempt to familiarize the reader with some aspects of the biology of dragonflies, the species of dragonflies present at the UWM Field Station and the times of the year when each …
Leachable Phosphorus Levels Of Urban Street Trees: Contributions To Urban Runoff, John R. Dorney
Leachable Phosphorus Levels Of Urban Street Trees: Contributions To Urban Runoff, John R. Dorney
Field Station Bulletins
Intelligent environmental management of urban areas depends upon a thorough understanding of urban ecosystem properties, such as structure, energy flow and materials cycles. This report examines the phosphorous cycle in urban runoff - a portion of the urban phosphorous cycle - which is involved in diffuse (non-point) source pollution from urban areas. The goals of my research were to determine if street tree leaves and seeds are a source of phosphorous in urban runoff and if so, how these levels varied between tree species.
Acid Precipitation: A Potential Environmental Problem At The Uwm Field Station, Nicholas P. Kobriger
Acid Precipitation: A Potential Environmental Problem At The Uwm Field Station, Nicholas P. Kobriger
Field Station Bulletins
Emissions into the atmosphere from man-related sources are changing precipitation quality and chemical climate over many parts of the United States, especially those areas downwind from highly urbanized and industrialized sections. Soils, vegetation and surface waters act as passive sinks for many elements found in the atmosphere (Oden, 1976). These elements are not fixed but are transferred from one component to the next at varying rates. High acidity in precipitation is a growing environmental problem (Oden, 1976, Cogbill, 1975b and USDI, 1973). Acids and other pollutants in the atmosphere which are washed out by rainfall can affect soil processes, plant …
Sex Identification In Black-Capped Chickadees, Charles M. Weise
Sex Identification In Black-Capped Chickadees, Charles M. Weise
Field Station Bulletins
At the UWM Field Station we have been banding chickadees since 1965, and color banding since 1967. Since 1970, I have conducted an intensive study of the population ecology of this species involving observations of the winter flock organization, dominance orders in flocks, territorial behavior in spring and summer, nesting success, dispersal of fledged young and survival of young from summer to winter. The objective is to understand how the chickadee population is regulated. The population occupies 750 acres of upland forests and bog forests and, at any one time, consists of 200-300 birds, virtually all color-banded for individual recognition. …
Salt And Milwaukee Street Trees, Susan Van Wyck, Forest Stearns
Salt And Milwaukee Street Trees, Susan Van Wyck, Forest Stearns
Field Station Bulletins
Many trees are not well-adapted to the rigors of urban life. Some are highly susceptible to the effects of S02. Others, such as the oaks, grow too slowly while cottonwood and horse chestnut for example, good city trees, in most respects, produce quantities of fruit or seeds considered a nuisance by many residents. Trees best adapted to urban life appear to be those native to floodplains such as elm, ash, silver maple and sycamore. These species evolved to survive spring floods, summer droughts and therefore are better suited to the poorly aerated city soils. Since the rapid demise of elms …
Oak Island Dynamics In Southeastern Wisconsin, Frank Mudrak
Oak Island Dynamics In Southeastern Wisconsin, Frank Mudrak
Field Station Bulletins
The oak forests of southeastern Wisconsin appear relatively consistent in species composition and probably have shown little change in this regard since European settlement, perhaps because they were originally forest islands in a prairie matrix and remain as islands in an agricultural setting. Elimination of periodic fire permitted the oak savanna to develop into oak forest. Apparently the degree of separation between islands and the xeric nature of the sites restrict invasion by exotic species established as cultivars in nearby villages and farmsteads. Neither tree species richness nor tree species diversity could be predicted from island size, substantiating the belief …