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Ecological Core Concepts -- Ecosystems -- Food webs and trophic cascades

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View Resource Long-term Response of an Arctic River Community to Phosphorus Fertilization

With this TIEE Data Set, students assess effects of phosphorus addition on algae, moss, mayflies, and arctic grayling fish in the Kuparuk River, in the foothills of the North Slope of Alaska. Data were taken over 15 years at the Arctic Long Term Ecological Research (ARC LTER) site at the Toolik field station. Phosphorus was added to the river as an experiment to study the effects of nutrient...

 

Publisher: EcoEd Digital Library

View Resource Issues in Ecology, Issue 04: Biodiversity and Ecosystem Functioning

In this report, biodiversity and its relevance to the ecosystems that support humanity is discussed. Ecosystem functioning is defined as the collective activities of all biota within an ecosystem and how they affect its chemical and physical factors; therefore, it can be negatively impacted by decreases in biodiversity-the wide variety of life forms inhabiting the planet. The ecological and...

 

Publisher: EcoEd Digital Library

View Resource Issues in Ecology, Issue 05: Biotic Invasions

This report is an introduction to exotic species invasions. An exotic species becomes invasive, when it proliferates unchecked across the region in which it was introduced. The transformation from immigrant to invader and how humans act as dispersal agents is explained. Attributes of invaders, effects on native community, global ecological and economic consequences, prevention, and long term...

 

Publisher: EcoEd Digital Library

View Resource Of wolves, elk and willows: how predation structures ecosystems

Predator-prey interactions are among the most familiar and important in ecology, and they are also fraught with common misconceptions for students and the lay public. The notion of potential indirect impacts of predator on prey has not occurred to most students, nor has the idea of trophic cascades. This Issue uses the example of wolf extirpation and restoration in the Greater Yellowstone region...

 

Publisher: EcoEd Digital Library

View Resource Enhancing science teachers' understanding of ecosystem interactions with qualitative conceptual models

The project described in this article explores how a series of conceptual ecological models can be used to portray the improvement in ecological understanding over the span of a short course. The course involved high school teachers working collaboratively on ecological research projects. Teachers were asked to construct qualitative conceptual models (a diagram of important ecosystem components...

 

Publisher: EcoEd Digital Library

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