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Question

Annual migration does not occur in case of
  1. Arctic tern
  2. Salamander
  3. Siberian Crane
  4. Salmon

A
Arctic tern
B
Salmon
C
Salamander
D
Siberian Crane
Solution
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  • Migration is used by a number of species, including birds, fish, invertebrates, and mammals, as one strategy for dealing with a seasonally variable environment.
  • In many cases, migration is obligated, but in some species, within a migratory population, only some individuals migrate in a given season (migrants), while the rest remain in the same location (residents), a phenomenon called as partial migration.
  • Partial migration can also occur when residents and migrants share a common ground but breed in separate locations.
  • Another form of partial migration occurs when non-migrating individuals actually forgo reproduction this is essentially a special form of low-frequency reproduction. This type of partial migration is well documented in salamanders, newts, sea turtles, and many species of fish.
  • Hence, Option "B" is correct.

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