Ocean and sea-run populations of sticklebacks have strong pelvic spines; sticklebacks in isolated glacial lakes have lost their pelvic spines. Identify the selective pressure that helps explain this evolutionary pattern.

Predatory fish are encountered by sea-run and ocean-going sticklebacks.
Isolated glacial lakes are much colder for sticklebacks.
Sticklebacks can find prey more easily if they can access the ocean.
Pelvic spines help male sticklebacks attract mates in the murky ocean water.

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Ocean and sea-run populations of sticklebacks have strong pelvic spines; sticklebacks in isolated glacial lakes have lost their pelvic spines. Identify the selective pressure that helps explain this evolutionary pattern.

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Question Text	Ocean and sea-run populations of sticklebacks have strong pelvic spines; sticklebacks in isolated glacial lakes have lost their pelvic spines. Identify the selective pressure that helps explain this evolutionary pattern.
Topic	All topics
Subject	Biology
Class	Class 11

Ocean and sea-run populations of sticklebacks have strong pelvic spines; sticklebacks in isolated glacial lakes have lost their pelvic spines. Identify the selective pressure that helps explain this evolutionary pattern.

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