Download Chapter 1 Section 2: Unifying Themes of Biology

Name: __________________________________________________ Period _______________
Chapter 14.1 Habitat And Niche (POWER NOTES)
Key Concept
Every organism has a _____________ and a ___________.
A. A habitat ___________ from a niche.
 A habitat is all aspects of the ________ in which an organism __________.
 _________ factors
 _________ factors
 An ecological _________ includes all of the factors that a species needs to _______,
stay__________, and ______________.
 ____________
 ____________ conditions
 ____________
B. ____________ availability gives ___________ to a community.
 Species can ________ habitats and resources.
 _____________ occurs when two species use resources in the same way.
 Competitive __________ keeps two species from __________ the same niche.
 Competitive exclusion has different ____________.
 One species is better _________ to the niche and the other will either be
pushed _______ or become _____________.
 The niche will be ____________.
 The two species will further ___________.
 Ecological _____________ are species that occupy similar niches but live in
different _______________ regions.
Name: __________________________________________________ Period _______________
14.2 COMMUNITY INTERACTIONS (POWER NOTES)
Key Concept
Organisms __________ as individuals and as ______________.
A. ____________ and ____________ are two important ways in
which organisms interact.
 Competition occurs when two organisms _________ for the
same ___________ resource.
 _____________ competition
 _____________ competition
 ____________ occurs when one organism captures and eats another.
 There are three major types of ________________ relationships.
 ____________: both organisms benefit
 Commensalism: one organism __________, the other is _____________
 ___________: one organism ___________, the other is harmed
 Parasites meet their needs as ______________ (such as leeches) and
_______________ (such as hookworms)
Visualize: Mutualism
Visualize: Predation
Visualize: Commensalism
Name: __________________________________________________ Period _______________
14.3 Density and Distribution (POWER NOTES)
KEY CONCEPT
Each population has a___________, a ___________, and a ______________ strategy.
A. Population density is the ______________ of individuals that live in a defined
__________.
 Scientists can calculate population ____________.

Population density = _____________
(units2)
B. Geographic _________________ of a population shows how individuals in a population
are _____________.
 _____________ dispersion refers to how a population is _______________ in an
area.

There are _________ types of dispersion.
 Clumped
 Uniform
 Random


____________ __________ help to describe the reproductive strategy of a
___________.
Survivorship curves can be __________, _____, or _________.
 Type I – low level of infant ______________ and an __________ population.
 Common to large ___________ and ____________.
 Type II – survivorship rate is __________ at all stages of ___________.
 Common to _________ and ___________.
 Type III – very high ___________, very high ____________ mortality.
 Common to _____________ and __________.
Name: __________________________________________________ Period _______________
14.4 Population and Growth Patterns (POWER NOTES)
KEY CONCEPTS
Populations grow in ______________ patterns.
A. Changes in a population’s size are determined by ___________, births, ____________
and ____________.
 The size of a population is always ____________.
 __________ factors affect the ___________ of a population.
 Immigration
 __________
 Emigration
 __________
B. Population growth is based on available _______________.
 ____________ growth is a _________ increase due to an ___________ of
resources.

_____________ growth is due to a population facing ____________ resources.
____________ ____________ is the maximum ___________ of individuals in a
population that the environment can support.
 A population ___________ is a dramatic ________ in the size of a population over a
short period of __________.
C. Ecological factors _________ population growth.
 A ___________ factor is something that keeps the size of a population ________.
 __________- __________ __________ are affected by the number of individuals
in a given area.
 __________
 ___________
 __________


__________ _____________ __________ limit a population’s growth regardless of
the _________.
o Unusual ___________
o ___________ disasters
o ___________ activities.
Name: __________________________________________________ Period _______________
14.5 Ecological Succession
KEY CONCEPTS
Ecological _______________ is a process of _________ in the species that make up a
community
A. ________________ occurs following a disturbance in an ecosystem

Succession regenerates or creates a ____________________ after a
disturbance
 A sequence of ____________ events
 __________________ communities are _____________________
 New communities arise in previously _____________________ areas
B. There are _____ types of succession

_______________ succession – started by _________________ species like
_________________ and some ________________ Use book page 420 to
fill in blocks below picture

_______________ succession – started by _________________ species left
over from a _________ or a _______________________ Use page 421 to
fill in blocks below picture