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Ecosystems

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Freda McKenzie

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Cards in this guide (14)
What is a climax community

A climax community is a stable community of a diverse number of species. The repetitive replacements of serial community's eventually leads to a establishment known as a climax community. An example can be Australia, because it is a climax forest ecosystem

Its a community in its final stage of sucession

What is a nonnative species

A species that does not normally live in an area

What did Malthus think would limit the population size

Food supply

How do peppered moths after the Industrial Revolution show the process of natural selection

The peppered moth had white bodies and wings, peppered with black. This coloration blended well into the original British countryside, hiding them from their predator the birds. Factories of the early industrial revolution covered everything with soot. Now the white stood out against the black surroundings making them easy targets for birds. Over time the white moths were wiped out. But, a few of them were darker in color, these survived and multiplied such that the white peppered moth was replaced buy the dark ones.

Black moths were selected for when the trees turned black.

the moths with the high fitness were selected for

The black moths were more fit for survival, so their phenotype frequency increased.

When will natural selection occur

Natural selection occurs when four conditions are met:

1. There is variation among individuals.

2. That variation is at least partially heritable.

3. That variation is linked to differential reproductive success.

4. More individuals are born than can survive and reproduce.

Which of the following would be the best method for randomly determining how many eggs an imaginary bird lays in a simulation

Rolling a six sided number cube and using the number on the top side.

What is a reproductive strategy

The method an organism uses to produce offspring

the way that a species creates offspring

What way leads to competition between two species

An overlap in their niches

If 12 of 100 organisms have short legs what is p

If 12 out of 100 organisms have short legs, P = 0.65.

As the snow melt from atop mountain in the spring the river below begins to flood what type of disturbance is this

Cyclical

What best describes the change in salinity in an estuary at low tide

Salinity falls as the out flowing tide brings in more fresh river water.

A dam is removed upriver from a wetland causing the river to bring much more freshwater to the wetland. What types of species in the wetland would be most negatively affected by this ch

uh ygvbbgg

A wildfire destroys part of a forest. How will squirrels that live in the forest and depend on trees most likely respond

Squirrels Will emigrate and leave the population

Which is a density dependent factor

Space apex

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