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American Robins

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American Robins. Robins are arriving earlier than before, often before the snow has ... Red Squirrels. Red squirrels are now bearing young about 18 days sooner ... – PowerPoint PPT presentation

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Title: American Robins


1
American Robins
  • Robins are arriving earlier than before, often
    before the snow has even melted. They have to
    wait out the snow in order to eat and breed.
  • In Colorado, robins are migrating from low to
    high elevations where they breed two weeks
    earlier than they did in the 1970s.
  • (Tangley)

2
Mexican Jays
  • In southern Arizona, the breeding season of
    Mexican Jays is as much as 10 days earlier now
    than in the 1970s.
  • The change correlates with higher spring
    temperatures, which rose nearly 4.5? F.
  • (Tangley)

3
Red-Winged Blackbirds
  • Red-winged blackbirds are arriving at breeding
    grounds in Michigan nearly 20 days earlier than
    the 1960s.
  • (Tangley)

4
Prothonotary Warblers
  • These birds have been returning to breeding
    grounds in Virginia from South America and the
    Caribbean a day earlier for the past 20 years.
  • (Tangley)

5
Loggerhead Sea Turtles
  • Loggerhead sea turtles are coming ashore to lay
    their eggs about 10 days earlier than 1989.
  • During this same time period, temperatures have
    increased by 1.5 ? F.
  • Warmer temperatures are also affecting the sex of
    sea turtles because the gender of these reptiles
    is determined by sand temperature.
  • (Tangley)

6
Red Squirrels
  • Red squirrels are now bearing young about 18 days
    sooner
  • This makes it the first known mammal to be
    evolving its phenology in response to global
    warming
  • (Tangley)

7
Oaks
  • Oaks are leafing out eight days earlier for every
    degree Celsius increase in temperature
  • (Jensen)

8
Ash
  • Ash trees are only leafing half as fast as the
    oaks
  • (Jensen)
  • Back to Student 10
  • Home
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