Beaks of Finches

Document Sample
Beaks of Finches Powered By Docstoc
					State Lab
Analysis and Questions
    1 Which Characteristics of your “beak”
     interfered with feeding success on the
    original island?

      Write something that describes the tool you used
      that made it difficult “slippery, flat surface seeds
       slipped off”.

2
Analysis and questions and answers
2. Name three traits other than beak
characteristics that cold contribute to the
 ability of a finch to compete successfully.


Your answers could include: eyesight,
coordination, aggressiveness,
 speed, motivation, feather color, size….
  Analysis Questions and answers
3. It is very unlikely that all of the beaks within a species
 of finch are exactly alike. Random mutations and new
 gene combinations resulting from sexual reproduction
are the source of beak variations.
Describe at least three beak variations that could
randomly appear and further improve your species’
chances of survival when feeding on small
 seeds.

   Your answer will vary but can include such traits as being small
   and light and having a nonskid surface.
Analysis Questions and answers
. Why did some “beak” types survive on the
4

new island (with large seeds) when they could
not survive on the original island?

They may not have been suited for gripping
small seeds but possessed characteristics that
 made them able to grip larger seeds.
Analysis and Questions
6. Did those who were successful in Round One
survive equally well when others were competing for
 food at the same dish during Round Two?

            Answer will vary



Support your answer with an explanation:

 Answers will vary: but “fewer should survive”
 Increased competition made it more
  difficult on gathering seeds
7.Why were there fewer survivors at the end
 of Round Three?

   There were fewer survivors due to increased
   competition.
8. At the end of Round three, were the types
of “beaks” that were successful on the new island
the same as the types of beaks that were
successful on the original Island?

              No

Support your answer with an explanation.

No, because the size difference in the seeds favored
 different types of beaks.
9.   Do the vocabulary on your own….

10.Predict which species of finch would be most likely
 to survive if the weather on the Galapagos Islands
gradually changed and the seeds available to the finches
became larger with heavier coverings.


      Large ground finches, because they have big,
      thick beaks.
  One island is populated by two species-
11.

 ground finches and small tree finches.
   a) what two types of food would you expect
    to be available on this island?

      Animal food (such as insects) and plant food (such
       as seeds). Use the chart here…..
    b) Would you expect the two species to compete
     for food on this island?
No they would not compete as long as there is enough
food for each species. If either food became scarce,
they might compete.

    c) How might the two native finch populations be
     affected if several dozen Sharp-billed ground finches
    were to migrate to the island and survive?

The small ground finches might have to compete with the
new Sharp-billed ground finches, since they have
Similar food preferences and beaks.
12. a) Explain how an island could support large
Populations of both Large Ground Finches and
 small Ground finches.
    The island would need to have both large and
    small seeds available.

     b)How could you use the materials provided
      in this lab to test your explanation?
I would put many large and small seeds in the same
 large dish. Then I would run trials using tools form
 the large seed survivors and tools from the
“small seed survivors” to compete for the seeds in
 the dish.

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:850
posted:5/20/2012
language:English
pages:12