Skip to main content
Pearson+ LogoPearson+ Logo
Ch. 54 - Biodiversity and Conservation Ecology
All textbooksFreeman 8th EditionCh. 54 - Biodiversity and Conservation EcologyProblem 14
Chapter 53, Problem 14

Do you drink coffee? A lot of people do—coffee is a major tropical crop, valued at over $100 billion per year. The most popular species of coffee, Coffea arabica, originated in Africa and is now planted extensively in Central and South America. The pest called the coffee berry borer beetle (Hypothenemus hampeii) moved along with the coffee and is a major problem for coffee farmers, sometimes destroying half of the coffee crop in mature plantations. The abundance of birds and other predators of borer beetles depends on how much natural forest is left within and around the coffee plantations. What is the approximate percentage increase in borer predators per hectare if forest cover is doubled from 15 to 30 percent?

Verified step by step guidance
1
Identify the data points for 15% and 30% forest cover on the graph.
Read the corresponding values of borer predators per hectare for these forest cover percentages.
Calculate the difference in the number of borer predators per hectare between 15% and 30% forest cover.
Determine the percentage increase using the formula: \( \text{Percentage Increase} = \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \times 100 \).
Substitute the values obtained from the graph into the formula to find the approximate percentage increase.

Verified Solution

Video duration:
1m
This video solution was recommended by our tutors as helpful for the problem above.
Was this helpful?
Related Practice
Textbook Question

Do you drink coffee? A lot of people do—coffee is a major tropical crop, valued at over $100 billion per year. The most popular species of coffee, Coffea arabica, originated in Africa and is now planted extensively in Central and South America. The pest called the coffee berry borer beetle (Hypothenemus hampeii) moved along with the coffee and is a major problem for coffee farmers, sometimes destroying half of the coffee crop in mature plantations. Look at the graph.


Why did the researchers bother to collect data from the coffee shrubs before adding the nets to treatment plots to exclude birds?

344
views
Textbook Question

Scientists around the world are collaborating to understand how deforestation, climate change, and natural processes will interact to affect one of the most productive and biodiverse ecosystems on Earth. Researchers have measured the effects of periodic forest fires on primary productivity in Amazon rain forest plots, comparing years with average precipitation and years with severe drought. Propose which controls would be necessary for such studies.

310
views
Textbook Question

Scientists around the world are collaborating to understand how deforestation, climate change, and natural processes will interact to affect one of the most productive and biodiverse ecosystems on Earth. This box-and-arrow model summarizes some of the feedback links observed in the Amazon rain forest. Select True or False for the statements that follow, based on whether they are represented by the model. (Note that the boxes and arrows in this model are used differently than those in the nutrient cycle models). T/F The burning of fossil fuels increases atmospheric CO2. T/F Tree growth reduces atmospheric CO2. T/F The death of trees promotes the invasion of grasses. T/F An increase in CO2 increases the frequency of droughts. T/F Drought increases the frequency of forest fires.

373
views
Textbook Question

Scientists around the world are collaborating to understand how deforestation, climate change, and natural processes will interact to affect one of the most productive and biodiverse ecosystems on Earth. Many studies have raised the concern that positive feedback loops among numerous variables in the Amazon will cause an ecosystem tipping point—a rapid and irreversible transition from forest to grassland. Use the model in Question 14 as a tool to summarize a possible sequence of effects that could cause a transition from forest to grassland.

337
views
Textbook Question

Do you drink coffee? A lot of people do—coffee is a major tropical crop, valued at over $100 billion per year. The most popular species of coffee, Coffea arabica, originated in Africa and is now planted extensively in Central and South America. The pest called the coffee berry borer beetle (Hypothenemus hampeii) moved along with the coffee and is a major problem for coffee farmers, sometimes destroying half of the coffee crop in mature plantations. Draw a simple model to compare the relative species richness and species diversity of these two coffee plantations: one is clear-cut and planted with only coffee shrubs, the other retains some natural forest. For symbols, use a few letters to represent different species of plants and a few numbers to represent different species of animals in a square 1-ha plot.

317
views
Open Question

This study suggests a form of sentience (the capacity to experience feelings and sensations) in bumble bees. How might these findings impact conservation policies?

61
views