37.10 - 37.13 Species + Succession Flashcards
Species Diversity
generally, the more diverse a community is, the more stable it is
How many factor sis species diversity made of
2
What are the 2 factors that make up species diversity
Species Richness and Relative Abundance
Species Richness
number of species that exist in a community
Relative Abundance
the number of individuals in any species in proportion to the number of organisms in the whole community
There is better Relative Abundance if the proportion is more _____
equal
Keystone Species
the species in a community that plays a critical role in the maintenance of the community
Is the keystone species the dominant species
not usually
There is only one keystone species in each community
True or False
False
How can you identify the keystone species in a food web
it is the species with the most arrows pointing away or towards it
What is an example of a keystone species
sea star –> stable amount of species when present, has drastic loss of species when organism is gone
Ecological Succession
the succession of ecosystems; when ecosystems replace other ecosystems
What does ecological succession focus on
autotrophs
Autotrophs are aka
primary producers
Primary Succession
the start of ecological succession –> occurs in a place that is mostly devoid of life and nutrients
Pioneer Organisms
the first organisms that succeed in the place devoid of life/nutrients
What is the most common pioneer organisms
lichens
Why are lichens the most common pioneer organisms
bc they break up rocks which adds nutrients, etc.
Lichens
two organisms that are often mistaken as one because of their strong symbiotic relationship
What are lichens made of
a photosynthetic organism and fungus
After lichens, what is the most common secondary organism
mosses which is able to break rocks and add nutrients to the soil better than lichens
After mosses what is the most common next organism
grasses
What organism comes commonly after grasses
Bushes and Shrubs
What is the last organism to usually develop
trees
Climax Community
either the final stage of ecological succession or when organisms have reached stability
Can the climax community be disturbed
yes
Secondary Succession
community that rises after a disturbance in the area
Does secondary succession start from barren land
no
Does secondary succession start with lichens
no
Can secondary succession only occur after the climax community is reached
no it can occur before
is secondary succession ecological succession
yes s
Invasive Species
organisms that are brought to communities that they are not native
Invasive Species are brought by
humans
___% of the time an invasive species dies
90
___% of the tie the invasive species lives
10
__% of the 10% of the invasive species that lives is harmful and causes problems
1
What is an example of an invasive species
A brown tree snake which was brought on a cargo plane to guam and killed off many native birds, lizards, and cuts power lines
