Welcome to Class! 9-2 and 9-3 Complete the following:  Glue vocab 4 and create 3 column chart  Take out Homefun Assigned Vocabulary  Take out Lab Report.

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Presentation transcript:

Welcome to Class! 9-2 and 9-3 Complete the following:  Glue vocab 4 and create 3 column chart  Take out Homefun Assigned Vocabulary  Take out Lab Report Heart Rate

Agenda  Lecture notes on Community Interaction  Foodweb Construction Lab  Homefun:  Assigned Vocabs (please print out just like the first time you did)

Niches and Community Interactions

Learning Objectives  Identify external factors that determine an organism’s niche.  Describe the role competition plays in shaping communities.  Describe the role predation and herbivory play in shaping communities.  Identify the three primary interdependent relationships among organisms.

What Is a Niche? The range of conditions in which a species lives and the way the species obtains the resources it needs

Defining a Niche Tolerance: the range of external conditions within which a species can survive and reproduce No survival No survival

Competition Intraspecific: between members of the same species Interspecific: between members of different species

Competitive Exclusion Principle No two species can occupy exactly the same niche in exactly the same habitat at exactly the same time.

Dividing Resources Spruce tree Cape May Warbler Bay-breasted Warbler Yellow-rumped Warbler

Predator-Prey Relationships One predator-prey cycle

Herbivory Size Growth Distribution Survival

Keystone Species A keystone species is a single species that is vital to ecosystem stability.

Symbiosis: Mutualism Clownfish and sea anemones help each other survive. A relationship between two species in which both species benefit

Symbiosis: Parasitism A relationship in which one organism lives inside or on another organism and harms it

Symbiosis: Commensalism A relationship in which one organism benefits and the other is neither helped nor harmed

Vocabulary Review Keystone species Parasitism Competitive exclusion principle Tolerance Interspecific Herbivory Explains division of resources among similar species Helps define a species’ niche One species benefits while harming another Between members of different species A single species vital to ecosystem stability Affects the size and distribution of plant populations in a community

Student Worksheet Answers