Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 56.3, Problem 2R
Summary Introduction
To review:
Beavers are considered an ecosystem engineering species and a keystone species, but not a foundation species.
Introduction:
An ecosystem engineering species is a species that influences and modifies its habitat in a significant way. A keystone species is a species, which plays an important role in its community, irrespective of its size or abundance. A foundation species is a species, which has a great impact on its community due to its large size or abundance.
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Chapter 56 Solutions
Life: The Science of Biology
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- Use the data in the Table below to answer the following 4 questions. 1. Create a graph (label this as Figure 1) of species richness and species diversity over the study years. Upload your graph in the next question. 2. a) When was species richness lowest, and when was it highest? b)When was species diversity lowest, and when was it highest? 3. What is the effect of invasive species H on community structure in year 3 compared to year 8? 4. What is the overall impact of invasive species H on the species richness and species diversity of this community? TABLE Species Richness Species Diversity YEAR 3 3 0.995 YEAR 8 5 1.516 YEAR 12 5 1.351 YEAR 15 6 1.197arrow_forwardafects small mammai populations. [Deer exclosures are rencing that keep deer UUI of an area) Fill in the blank with the correct word: According to theory, excluding the herbivore deer from the forest the growth of plants in the exclosure. should increase O decreasearrow_forwardIn your region, what species are threatened with extinction? Why are they vulnerable? Suggest steps that could be taken to increase their populations.arrow_forward
- A niche is loosely defined as an organism's role in its environment, which can include factors such as feeding preference, nesting behaviors, mating behaviors, method of obtaining prey, and local habitats. Keeping Gause's law in mind, do some research on the California red-legged frog and the North Pacific tree frog (use wiki or another Google search). Create a chart comparing the two with respect to their niche or lifestyle that can explain how these two frogs can co-exist in the same ecosystem.arrow_forwardImagine a community of organisms in a forest is affected by a chemical spill that leads to a fire. The fire is contained and burns out and the chemical spill is cleaned up. Monitoring of the plant community following this disturbance researchers noticed that after the spill and fire there was a sharp drop in species diversity, abundance, and richness. Over the next 5 years the area was monitored. The community's diversity, abundance, and richness all increased slightly during the first year however after the first year only the abundance went up during the following 4 years with no changes in any other area. Which of the following models explains these patterns? Restructured Gradual recovery Hangover effect Eliminatedarrow_forwardprovide an example of a biological species or genera that have benefitted from human activity. Be sure to explain the relationship between humans and these organisms, and the larger implications for ecosystems that result from this relationship.arrow_forward
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