Which of the following threats to terrestrial biomes is FALSE? O Exploration of oil and gas threaten both boreal forest and tundra ecosystems. Climate change, farming practices, and overgrazing are leading to the desertification of tropical savannas. O Logging for timber poses a greater threat to tropical rain forests compared to effects of large-scale agriculture. O Human-mediated changes in the frequency and intensity of fire are threatening Mediterranean shrublands.

Which of the following threats to terrestrial biomes is FALSE? O Exploration of oil and gas threaten both boreal forest and tundra ecosystems. Climate change, farming practices, and overgrazing are leading to the desertification of tropical savannas. O Logging for timber poses a greater threat to tropical rain forests compared to effects of large-scale agriculture. O Human-mediated changes in the frequency and intensity of fire are threatening Mediterranean shrublands.

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter20: Ecosystems And The Biosphere

Section: Chapter Questions

Problem 15CTQ: The extremely low precipitation of subtropical desert biomes might lead one to expect fire to be a...

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The extremely low precipitation of subtropical desert biomes might lead one to expect fire to be a major disturbance factor; however, fire is more common in the temperate grassland biome than in the subtropical desert biome. Why is this?
A limiting resource does all the following except that it (a) tends to restrict the ecological niche of a species (b) is in short supply relative to a species need for it (c) limits the presence of a species in a given community (d) results in an intermediate disturbance (e) may be limiting for only part of an organisms life cycle
The change in the species composition of a terrestrial community from bare and lifeless rock to climax vegetation is called: a. disturbance. b. competition. c. secondary succession. d. primary succession. e. facilitation.
Which of the following statements is supported by the results of studies at the Hubbard Brook Experimental Forest? a. Most of the energy captured by primary producers is lostbefore it reaches the highest trophic level in an ecosystem. b. Deforested watersheds experience significantly less runoffthan undisturbed watersheds. c. Deforested watersheds lose more calcium and nitrogen inrunoff than undisturbed watersheds. d. Nutrients generally move through biogeochemical cycles veryquickly. e. Deforested watersheds generally receive more rainfall thanundisturbed watersheds.
Complete competitors cannot coexist is a statement of the principle of (a) primary succession (b) limiting resources (c) Mllerian mimicry (d) competitive exclusion (e) character displacement
Primary productivity on land is affected by _______. a. nutrient availability c. temperature b. amount of sunlight d. all of the above
Figure 44.12 Which of the following statements about biomes is false? Chaparral is dominated by shrubs. Savannas and temperate grasslands are dominated by grasses. Boreal forests are dominated by deciduous trees. Lichens are common in the arctic tundra.
The _______________ signifies that species richness is greater where two communities meet than at the center of either community. (a) edge effect (b) fundamental niche (c) character displacement (d) realized niche (e) limiting resource
Competition with other species helps determine an organisms (a) ecotone (b) fundamental niche (c) realized niche (d) limiting resource (e) ecosystem
Tree Rings and Droughts El Malpais National Monument, in west central New Mexico, has pockets of vegetation that have been surrounded by lava fields for about 3,000 years, so they have escaped wildfires, grazing animals, agricultural activity, and logging. Henri Grissino-Mayer generated a 2,129-year annual precipitation record using tree ring data from living and dead trees in this park (FIGURE 27.23). FIGURE 27.23 A 2.129-year annual precipitation record inferred from com pled tree ring data in El Malpais National Monument Now Mexico. Data ware averaged over 10-yeer intervals; graph correlates with other indicators of rainfall collected in all parts of North America. PDSI, Palmer Drought Severity Index: O, normal rainfall increasing numbers mean increasing excess of rainfall decreasing numbers mean increasing severity of drought A severe drought contributed to a series of catastrophic dust stem's that turned the rid western United States into a oust bow between 1933 and 1939. 1. Around 770 A. D., the Mayan civilization began to suffer a massive population loss, particularly in the southern lowlands of Mesoamerica. The El Malpais tree ring data show a drought during that time. Was it more or less severe than the dust bowl drought?
Tree Rings and Droughts El Malpais National Monument, in west central New Mexico, has pockets of vegetation that have been surrounded by lava fields for about 3,000 years, so they have escaped wildfires, grazing animals, agricultural activity, and logging. Henri Grissino-Mayer generated a 2,129-year annual precipitation record using tree ring data from living and dead trees in this park (FIGURE 27.23). FIGURE 27.23 A 2.129-year annual precipitation record inferred from com pled tree ring data in El Malpais National Monument Now Mexico. Data ware averaged over 10-yeer intervals; graph correlates with other indicators of rainfall collected in all parts of North America. PDSI, Palmer Drought Severity Index: O, normal rainfall increasing numbers mean increasing excess of rainfall decreasing numbers mean increasing severity of drought A severe drought contributed to a series of catastrophic dust stem's that turned the rid western United States into a oust bow between 1933 and 1939. 2. One of the worst population catastrophes ever recorded occurred in Mesoamerica between 1519 and 1600 a. d., when around 22 million people native to the region died. Which period between 137 B.C. and 1992 had the most severe drought? How long did that drought last?
INTERTRET DATA Scientists have compiled databases of large forest wildfires in the western United States and compared them to climate and land-surface data. Examine the graph showing wildfire frequency compared to average springsummer temperature. Do you see a correlation? If so, describe it. Based on these data, do you think that climate warming is causing more wildfires? Explain your answer.