Concept explainers
To determine: The tree species that was most often killed by A. ostoyae and least affected by it in control forests.
Introduction: Parasitic
Answer to Problem 1DAA
Correct answer: Larch tree species were most often killed by A. ostoyae, while birch trees were the least affected.
Explanation of Solution
A. ostoyae is a parasite of both living and dead trees. As given in the problem statement, Canadian forest pathologists tested their hypothesis that removing stumps after logging could help to prevent tree deaths. They made an experimental design. They removed stumps after logging from half of a forest and left stumps in the control area. They recorded tree deaths for almost more than 20 years. Refer Fig. 23.16, “Effect of stump removal on the spread of a fungal pathogen”, in the textbook. The graphical representation showed that long-term study of logging practices affects tree deaths by A. ostoyae. The experimental forest trees including stumps were removed and are shown as brown bars, and the control forest trees with stumps left behind are shown as blue bars. The data for percent cumulative mortality show that Larch tree species were often killed by A. ostoyae (approximately 27 %) in control forests. The tree species in control forests that were least affected by A. ostoyae were Birch trees (approximately 1 %).
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Chapter 23 Solutions
Biology: The Unity and Diversity of Life
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- Which of the following statements is true regarding mycorrhizal relationships? this relationship is a type of parasitism bacteria partner with plant roots fungi provide energy (ATP) for their partner all glomeromycota are mycorrhizal fungi no statements above are truearrow_forwardMutualistic associations between fungi and the roots of plants are called (a) lichens (b) mycorrhizae (c) pathogenic associations (d) parasitic haustoria (e) mycotoxic symbiosesarrow_forwardFigure 24.21 If symbiotic fungi are absent from the soil, what impact do you think this would have on plant growth?arrow_forward
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