Download Introduction to Ecology: Terms and Concepts and more Quizzes Biology in PDF only on Docsity!
What is a community?
is an assemblage of populations interacting with one another within the same environment. TERM 2
Species Richness
DEFINITION 2 Species richness is the number of different types of species in a community TERM 3
Species diversity
DEFINITION 3 A combination of species richness and relative abundance Low diversity example: Community with 10 species and 100 individuals 90 in one species One each in the other 9 species High diversity Community with 10 species and 100 individuals Each species has 10 individuals TERM 4
What are Food Webs?
DEFINITION 4 illustrate how species feed on each other in community. TERM 5
What is Symbiosis?
DEFINITION 5 Symbiosis is a close association between two species where at least one species is dependent upon the other.
What are the Types of Symbiosis?
Parasitism -In a parasitic relationship, the parasite benefits and the host is harmed. -Parasites derive nourishment from their host. Commensalism -In a commensalistic relationship, neither party is harmed. Mutualism -In a mutualistic relationship, both partners benefit. Lichens have traditionally been regarded as mutualistic TERM 7
Characteristics of a Community
DEFINITION 7 Communities have diversity (species richness and relative abundance). Communities have physical structure Organisms in a community compete for resources Organisms in a community are organized into food webs. TERM 8
what is an ecological niche?
DEFINITION 8 is defined by the role an organism plays in its community, including its habitat and how it interacts with other species in the community. Usually defined in terms of feeding habits TERM 9
what is a habitat?
DEFINITION 9 is where it lives in the community. TERM 10
How does the 2nd Law of Thermodynamics
influence how energy
DEFINITION 10 each time energy is converted from one form to another, some of the energy is always degraded to a lower quality, more dispersed, less useful form No system can convert energy form one to another form with 100% efficiency
Global Water Crisis
Limited amount of fresh water Desalinization is expensive and requires large amounts of energy Aquifers are being depleted Groundwater is contaminated Sewage, agricultural runoff, and industrial chemicals pollute rivers and lakes.
