Unit 3 Study Guide Flashcards
(21 cards)
If the gene pool of two populations are separated, the populations may develop into a new species.
Speciation
The Kaibab squirrel became its own species when a small population was isolated on the northern rim of the Grand Canyon. Which type of speciation is this?
Geographic isolation: canyon acted as a physical barrier
20 different species of galagos, also known as bushbabies, are found in Africa. Even though various species of galagos share habitats, they cannot interbreed with one another because of their differently structured genitalia. Which type of speciation is this?
Mechanical Isolation: physical traits of organisms do not allow reproduction
An ecologist is dissatisfied two animals’ ability to reproduce with one another. Which is he talking about?
Fecundity: ability to reproduce
Which is NOT true about animal species?
There is NOT a central registry and species are NOT well or universally documented
Which type of strategists would you expect to have low levels of prenatal care and a short life expectancy?
R-strategists
Long life expectancy usually correlates with all the following, except:
Rapid Reproduction
Which all of the following is NOT a density-dependent factor?
Weather, natural disasters, usually biotic
What causes a J curve to flatten into an S curve?
Limiting factors bringing the population to carrying capacity
Over-exploitation of animals is likely to cause:
Species extinction
Graph on the right shows:
A. Logistic growth
C. An S curve
Answer: both A and C
Which letter represents The carrying capacity for this population?
C. When the curve flattens the population reacted carrying capacity
What does the population pyramid show?
A Declining population
Based on the population pyramid, it appears that in the last 30 years, fertility has
Decreased; it is decreasing
The population pyramid could possibly from which country?
Germany
Draw the 3 types of survivorship curves and label each with the correct type.
- Low fertility, high prenatal care
- Consistent mortality throughout life
- High fertility, low prenatal care, high mortality
Give an example of an animal that is an R-strategist and explain why
Dogs are R-strategists because they have many offspring and they have high infant mortality.
Describe a hypothetical situation in which a species would be separated by temporal speciation
When 2 or more species reproduce at different times. Ex: 3 species of flowers living in the same forest
What is the principal of competitive exclusion?
It states that two species cannot compete for resources within the same niche and still survive/thrive
Draw 3 simple graphs. One should show logistic growth, one should show exponential growth, and one should show linear growth. Label them with the correct term.
What type of speciation was occurring in the Ozark’s Collared Lizard population? How was further speciation prevented?
The lizard experienced geographic isolation. This speciation was prevented with prescribed burns to keep vegetation down so the lizards could move more easily from glade to glade.
