Now showing items 11-20 of 50
Nitrate deposition in northern hardwood forests and the nitrogen metabolism of Acer saccharum marsh
(Springer-Verlag, 1996-10)
It is generally assumed that plant assimilation constitutes the major sink for anthropogenic Nitrate NO 3 − deposited in temperate forests because plant growth is usually limited by nitrogen (N) availability. Nevertheless, ...
Using normative scenarios in landscape ecology
(Kluwer Academic Publishers; Springer Science+Business Media, 2004-05)
The normative landscape scenario is one of many types of scenario methods that are used by landscape ecologists. We describe how normative landscape scenarios are different from other types and how these differences create ...
Models of coupled population oscillators using 1-D maps
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 1998-08)
Coupled population oscillators are investigated with the use of coupled logistic maps. Two forms of coupling are employed, reproductive and density. Three biologically distinct situations are investigated: populations ...
Arthropod biodiversity loss and the transformation of a tropical agro-ecosystem
(Kluwer Academic Publishers; Chapman & Hall ; Springer Science+Business Media, 1997-07)
The coffee (Coffea arabica) agro-ecosystem in the Central Valley of Costa Rica was formerly characterized by a high vegetational diversity. This complex system has been undergoing a major transformation to capital-intensive ...
Land use and forest cover on private parcels in the Upper Midwest USA, 1970 to 1990
(Kluwer Academic Publishers; Springer Science+Business Media, 2003-11)
This paper analyzes the interactions between land use and forest cover in the Upper Midwest, USA from 1970 to 1990. New data are presented and interpreted to evaluate the effects of land-use changes, especially abandonment ...
An epidemiological model of the corn stunt system in Central America
(Elsevier, 1990)
There is increasing appreciation on the part of ecologists of the crucial role that pathogens may play in the structure of plant populations and communities. This study used classic equations of epidemiology to analyze ...
An experiment in intercropping cucumbers and tomatoes in Southern Michigan, U.S.A.
(Elsevier, 1982-11)
Yields are reported for an experimental intercrop of tomatoes and cucumbers in southeastern Michigan, U.S.A., during the 1980 growing-season. The land equivalent ratio (LER) was 1.14, that is, 14% more land would be needed ...
Impacts of major predators on tropical agroforest arthropods: comparisons within and across taxa
(Springer-Verlag, 2004-06)
In food web studies, taxonomically unrelated predators are often grouped into trophic levels regardless of their relative importance on prey assemblages, multiple predator effects, or interactions such as omnivory. Ants ...
On the regional stabilization of locally unstable predator-prey relationships
(Elsevier, 1973-09-14)
The stabilizing effects of interhabitat migration and local population extinction are established by an analysis of the variable Pi, where Pi refers to the proportion of habitats occupied by species i. This is followed by ...