Power_AnswersSampleQuestions2

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Unformatted text preview: More
sample
questions
for
Ecology
Section
of
Bio
1b
 
 Match
the
example
to
the
general
concept
it
best
illustrates:
 
 Concepts
(match
these
to
the
example
that
best
fits
the
concept)
 
 a


population
regulation

 b.

predator
mediated
(indirect)
competition
 c.

life
history
bottlenecks
 d.

realized
niches
are
subsets
of
fundamental
niches
 e.

source
sink
dynamics
 
 1.

A
rabbit
will
graze
over
the
entire
meadow
in
the
absence
of
predators,
but
will
 restrict
its
foraging
to
just
beyond
the
forest
edge
if
predatory
coyotes
are
present.
 d.

realized
niche
reduced
because
of
threat
from
predators
 
 2.

Deer
carry
pathogens
that
spread
to
moose,
making
them
sick.
 
 b.
pathogen
mediated
competition—I
was
wrong
not
to
say
enemy
mediated
 competition
in
question,
which
could
technically
include
predators
or
 pathogens….


 
 3.

Sea
turtle
populations
recover
if
juveniles
are
protected
from
shrimp
trawlers,
 but
rearing
and
releasing
hatchlings
makes
no
difference
to
their
population
 dynamics
 
 c.

life
history
bottleneck—the
life
history
stage
limiting
the
recovery
of
 populations
is
the
juvenile
stage,
not
the
egg
or
hatchling
stage.
 
 4.

Gophers
in
Tilden
Park
tend
to
experience
higher
birth
rates
than
death
rates
 when
their
populations
are
sparse,
and
higher
death
rates
than
birth
rates
when
 they
are
dense.
 
 a.

Population
regulation
by
the
negative
feedback
of
having

birth
rates
 decrease
or
death
rates
increase
as
population
abundance
increases.
 
 5.

Songbirds
in
the
Midwestern
US,
where
forests
are
severely
fragmented,
do
not
 nest
successfully,
and
persist
only
because
of
immigration
from
populations
 reproducing
in
the
more
continuous
forests
of
the
Southeast.
 
 e.

Source
sink
dynamics,
with
the
Midwest
being
a
sink
habitat
supplied
with
 new
immigrants
from
source
habitats
in
the
Southeast.
 
 6.

A
bumblebee
chews
through
the
base
of
a
flower
to
take
its
nectar
without
 passing
by
the
anthers
and
getting
dusted
with
its
pollen.

The
interaction
of
the
 bumblebee
with
the
flower
could
best
be
described
as
that
of
a
 
 a.

a
predator
 b.
a
mutualist
 c.

a
pollinator
 d.

a
parasite
 e.

an
endosymbiont
 
 7.

In
fall
and
spring,
lakes
in
North
America
tend
to
“turn
over”,
mixing
the
entire
 water
column.

What
is
the
most
likely
reason
for
this?
 
 a.

Strong
winds
blow
during
these
seasons.
 b.

Temperatures
become
equalized
throughout
the
water
column,
eliminating
 thermal
stratification.

(Wind
stirring
would
would
help
turnover,
but
 probably
wouldn’t
be
sufficient
to
mix
bottom
layers
if
the
water
column
were
 thermally
stratified.)
 c.

Gases
released
from
bottom
sediments
during
these
seasons
mix
the
water
 column
 d.

A
reversal
of
Coriolis
Effect
direction
can
remix
the
lake
basin
at
this
time.
 e.

Seasonal
vertical
migrations
of
large‐bodied
zooplankton
stir
up
the
water
 column.
 
 8.

Seabirds
nesting
on
a
crowded
oceanic
island
are
spaced
“one
peck
apart”
so
that
 parents
in
one
nest
can’t
reach
over
and
injure
or
kill
nestling
(juvenile)
birds
in nests
of
their
neighbors.

This
is
an
example
of
 
 a.

interference
competition
(direct,
mutually
harmful
interaction
between
 parent
birds.
)

 b.

parasitism
 c.

exploitative
competition
 d.

apparent
competition
 e.

density
independent
mortality
 
 9.
Swordfish
have
higher
mercury
concentrations
than
smaller
ocean‐dwelling
fish
 because
 
 a.

They
live
a
long
time
and
are
near
the
top
of
their
food
chain.
 b.

They
occur
in
parts
of
the
ocean
where
mercury
has
concentrated,
like
 subtropical
gyres.
 c.

The
fishing
gear
used
to
catch
them
contaminates
the
fish.
 d.

Smaller
fish
are
able
to
purge
their
bodies
of
mercury.
 e.

Swordfish
are
active
and
respire
heavily,
passing
a
lot
of
ocean
water
over
their
 gills,
where
mercury
from
the
water
is
taken
up.
 
 
 ...
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This note was uploaded on 10/14/2010 for the course BIO 1B taught by Professor Carlson,mischel,power during the Fall '07 term at University of California, Berkeley.

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