EBK BIOLOGY
5th Edition
ISBN: 8220100667978
Author: Maier
Publisher: PEARSON
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Textbook Question
Chapter 15, Problem 1AAATB
Off the coast of the Pacific Northwest, areas dominated by large algae, called kelp, are common. These “kelp forests” provide homes for small plant-eating fishes, clams, and abalone. These animals in turn provide food for crabs and larger fishes. A major predator of kelp in these areas is sea urchins, which are preyed on by sea otters. When sea otters were hunted nearly to extinction in the early twentieth century, the kelp forest collapsed. The kelp were only found in low levels, while sea urchins proliferated on the seafloor. Use this information to construct a simple food web of the kelp forest. Using the food web, explain why sea otters are a keystone species in this system.
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Biologists in Haida Gwaii (an archipelago off the coast of British Columbia) are interested in restoring
coastal kelp forests. This habitat is critical for fish and the endangered northern abalone. However,
urchins are efficient grazers that can quickly mow through patches of kelp, creating 'barrens' (regions
without much life like the region shown in the picture above). These barrens leave little food or
habitat for the abalone (which also eat kelp). To combat these hungry urchins, divers collect or crack
(kill) any urchins they see in the study area. Identify the species interactions (+/-/0):
1. Urchins on kelp
[ Select ]
2. Kelp on urchins
[ Select ]
3. Humans on urchins [Select ]
4. Kelp on abalone
[ Select ]
5. Abalone on kelp [ Select]
6. What is the name of the interaction between kelp and abalone?
[ Select ]
I’m having hard time understanding which is abiotic or biotic to this answer. Can you please help?
If sea otters are removed from the kelp forest ecosystem, sea urchins will be able to live and reproduce with no main predator. Whole “herds” of sea urchins have been known to sweep across the ocean floor, gobbling kelp stands at a rate of up to 30 feet per month and leaving barren sea floor in their wake. Once barren, the entire kelp forest ecosystem is destroyed and can no longer support the diversity of life once found there. The EVIDENCE above supports the CLAIM that which animal along the Central California coast is considered a keystone species?
Chapter 15 Solutions
EBK BIOLOGY
Ch. 15 - Prob. 1LTBCh. 15 - Compare and contrast the species interactions of...Ch. 15 - Prob. 3LTBCh. 15 - Current rates of species extinction appear to be...Ch. 15 - According to the generalized species-area curve,...Ch. 15 - Prob. 6LTBCh. 15 - Prob. 7LTBCh. 15 - Which of the following is an example of a...Ch. 15 - Prob. 9LTBCh. 15 - Prob. 10LTB
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