ppt interaction between species

1. INTERACTION BETWEEN
SPECIES

14. Ben’s Story
Directions: Read the story. As you are reading, identify the
species interactions and describe them on the following page.
Ben lived in a rural area with his parents and his twin sister.
Ben’s mom and dad always comparing him to his sister, which
sparks competition in almost everything they did. Whether it
was who is more organized with their room better or who got
better grades in school, they were constantly trying to beat
one another at something! These small competitions went on
for many years, but neither Ben nor his sister every truly won!

15. As Ben got older, he becomes attracted to nature, he loves bees in particular. He wait-ed
and watch bees gather nectar from the flowers in his mother’s garden. Ben starts to be
curious about how the flowers were not dying even the bees kept taking the nectar. Ben
conducts research and found out that when the bees gather nectar, they are also
dispersing pollen which resulted in pollination and more flowers to grow. Ben’s love for
nature didn’t stop at bees, he also loved to learn about biology. One day in his science
class, Ben learned about the natural bacteria that were living in his and everyone else’s
digestive tract. Terrified, he tells his mom he needed to go to the doctor to get rid of the
bacteria! When he got home. Ben’s mom calmed him down and explained that the
bacteria help us to digest our food and we provide a place for the bacteria to live. In other
words, we need bacteria and the bacteria need us! One day, during his lunch break, Ben
was excited to buy his favorite lunch at the canteen. By the time he arrived, only a few
packs left of his favorite food. Against his better judgment, Ben cut in line so he would be
able to get buy. This did not go over well with the other students who had been waiting
in line. An argument escalated between Kibbe and another student. As the argument
quickly drew more and more attention, security was alerted and both were escorted out
of the canteen. Even though Ben had a very odd personality, he had a heart of gold. Once
while walking home from school, he saw an elderly woman who has a hard time crossing
the street. Ben did not hesitate to help the old woman cross the street.

16. A fight between Ben and a man broke out at a party one night. Ben spent
a night in the county jail and the man a trip to the emergency room. In the
following weeks, Ben grow isolated. He didn’t even want to go to the
grocery stores in fear he might run into someone who witnessed the fight.
At one point, Ben started making “friends” with the occasional centipede
that would crawl across the wall only because centipedes preyed on
spiders, and Ben HATED spiders. Over a week of unable to shower, he
became increasingly itchy as the days went by. Turns out, the natural
bacteria that live on skin had more than tripled in size and caused an
outbreak of eczema all over his body! Although he was unharmed from
eczema, he decided it was time to get the water turned on! When Ben was
an elderly man, he decided to adopt a puppy, which he named max. Max
and Ben were best buddies! They did EVERYTHING together. The
friendship last-ed 10 years! Ben was devastated that Max had to be put
down due to complications from a heartworm infection.

18. Application
Situation Analysis
Your goal in this section is to take a closer look
at some aspects about ecosystem. Ecosystems
have their ways in maintain its balanced state.
While doing this activity, take note od how the
population of the predator and the prey
affects each other.

19. Deer: Predation or Starvation?
Introduction: In 1970 the deer population of an island forest reserve was about 2000 ani-mals.
Although the island had excellent vegetation for feeding, the food supply had limits. Thus, the
forest management personnel feared that overgrazing might lead to mass starvation. Since the
area was too remote for hunters, the wildlife service decided to bring in natural predators to
control the deer population. It was hoped that natural predation would keep the deer population
from becoming too large and also increase the deer quality (or health), as predators often
eliminate the weaker members of the herd. In 1971, ten wolves were flown into the island.
The results of this program are shown in the following table. The population change is the
number of deer born minus the number of deer that died during that year. The herd population
started at 2000 when this study began.
1. Calculate the number of deaths (predation + starvation).
2. To determine the deer population change, subtract the number of deaths from births (births -
deaths), this can be a positive number, indicating growth, or a negative number which indicates a
population decline.
3. Calculate the deer population by adding/subtracting the population change from the
population the year before
4. The first row (1971) has been completed for you as an example.

21. 1. Describe what happened to the deer population between 1971 and
1980.
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2. When was the wolf population the highest? What is the relationship
between the number of wolves and the number of deer?
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22. 3. What do you think would have happened to the deer on the island had wolves NOT
been introduced?
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4. Zero population growth occurs when a population has the same number of
individuals entering the population (births) as those leaving the population (deaths).
This results in very little change in the overall population numbers. In which year, was
the deer population clos-est to ZPG? How do you know?
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23. 5. Most biology textbooks describe that predators and prey exist in a balance. This
"balance of nature" hypothesis suggests a relationship between predators and
prey that is good and necessary. Why is death by predators more natural or "right"
then death by
starvation?_____________________________________________________________________________
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