QUESTION 10 Paxton Lake in British Columbia, Canada, has two different types of stickleback fishes: benthics and limnetics. Benthics are stout-bodied fish with wide mouths that feed on invertebrates in the mud in the shallow margins of the lake. Limnetics are slim-bodied fish with narrow mouths that feed on zooplankton in the center of the lake. Researchers working on the sticklebacks have made the following observations: • Limnetic and benthic sticklebacks differ in the number of dorsal spines, the number of lateral plates, and the presence of a pelvic girdle. • In Paxton Lake, 1-2% of sticklebacks are hybrids. • Limnetic and benthic sticklebacks build their nests in the same region on the benthic margin of Paxton Lake. However, benthic males select heavily vegetated areas, whereas limnetic males select bare areas of the lake bottom. • Hybrid fish were released in a small lake that lacked a resident stickleback population. Twenty years later, there is a small, healthy population of sticklebacks in the lake. • Limnetic and benthic males differ in courtship behaviors. • When given a choice, male and female benthics and limnetics choose to mate with their own kind. Consider the information provided above in answering the questions below. a. Does the case study describe sympatric or allopatric speciation? Answer: b. Do the benthic and limnetic sticklebacks of Paxton Lake represent separate species: i. According to the biological species concept? Enter "yes" or "no": ii. According to the morphological species concept? Enter "yes" or "no": ii. According to the ecological species concept? Enter "yes" or "no":
QUESTION 10 Paxton Lake in British Columbia, Canada, has two different types of stickleback fishes: benthics and limnetics. Benthics are stout-bodied fish with wide mouths that feed on invertebrates in the mud in the shallow margins of the lake. Limnetics are slim-bodied fish with narrow mouths that feed on zooplankton in the center of the lake. Researchers working on the sticklebacks have made the following observations: • Limnetic and benthic sticklebacks differ in the number of dorsal spines, the number of lateral plates, and the presence of a pelvic girdle. • In Paxton Lake, 1-2% of sticklebacks are hybrids. • Limnetic and benthic sticklebacks build their nests in the same region on the benthic margin of Paxton Lake. However, benthic males select heavily vegetated areas, whereas limnetic males select bare areas of the lake bottom. • Hybrid fish were released in a small lake that lacked a resident stickleback population. Twenty years later, there is a small, healthy population of sticklebacks in the lake. • Limnetic and benthic males differ in courtship behaviors. • When given a choice, male and female benthics and limnetics choose to mate with their own kind. Consider the information provided above in answering the questions below. a. Does the case study describe sympatric or allopatric speciation? Answer: b. Do the benthic and limnetic sticklebacks of Paxton Lake represent separate species: i. According to the biological species concept? Enter "yes" or "no": ii. According to the morphological species concept? Enter "yes" or "no": ii. According to the ecological species concept? Enter "yes" or "no":
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:QUESTION 10
Paxton Lake in British Columbia, Canada, has two different types of stickleback fishes: benthics and limnetics. Benthics are stout-bodied fish with wide mouths that feed on
invertebrates in the mud in the shallow margins of the lake. Limnetics are slim-bodied fish with narrow mouths that feed on zooplankton in the center of the lake.
Researchers working on the sticklebacks have made the following observations:
• Limnetic and benthic sticklebacks differ in the number of dorsal spines, the number of lateral plates, and the presence of a pelvic girdle.
• In Paxton Lake, 1-2% of sticklebacks are hybrids.
• Limnetic and benthic sticklebacks build their nests in the same region on the benthic margin of Paxton Lake. However, benthic males select heavily vegetated areas,
whereas limnetic males select bare areas of the lake bottom.
• Hybrid fish were released in a small lake that lacked a resident stickleback population. Twenty years later, there is a small, healthy population of sticklebacks in the lake.
• Limnetic and benthic males differ in courtship behaviors.
• When given a choice, male and female benthics and limnetics choose to mate with their own kind.
Consider the information provided above in answering the questions below.
a. Does the case study describe sympatric or allopatric speciation? Answer:
b. Do the benthic and limnetic sticklebacks of Paxton Lake represent separate species:
i. According to the biological species concept? Enter "yes" or "no":
ii. According to the morphological species concept? Enter "yes" or "no":
iii. According to the ecological species concept? Enter "yes" or "no":
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