Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
28 Cards in this Set
- Front
- Back
|
Population Ecology |
Studies population characteristics and their changes in response to the environment |
|
|
Population |
a group of individuals of a species that live in the same area |
|
|
Characteristics of a Population |
Size/Abundance Distribution/Spacing of individuals Density Sex ratios and age structures Birth, Death, and movement of individuals |
|
|
Genet |
A genetic individual arising form a zygote |
|
|
Ramets |
Clones produced asexually by the genet. Some time physically linked to the parent or separate. |
|
|
Example of Ramets? |
A group of 47,000 Quaking Aspen |
|
|
What influences population distribution? |
-Occurrence of suitable environmental conditions -Geographic barriers -Competition and Predation |
|
|
What are the three types of distributions? |
-Random -Uniform -Clumped |
|
|
What distribution pattern is the most common? |
Clumped |
|
|
Population Density |
The number of individuals per unit area or per unit volume |
|
|
Ecological Density |
The number of individuals per unit of suitable habitat |
|
|
Distribution |
A population describes its spatial location, the area over which it occurs |
|
|
Geographic Range |
The defined area encompasses all the individuals of a species. ( Total area occupied by a population) |
|
|
Abundance |
The number of individuals in the population |
|
|
Crude Density |
Density measured simply as the number of individuals per unit area |
|
|
Logical Density |
The number of individuals per unit of available living space. |
|
|
Dispersal |
The movement of an individual in space |
|
|
Emigration |
When individuals move out of a subpopulation |
|
|
Immigration |
When individual moves from another location into a subpopulation |
|
|
Sex ratio |
Proportion of males o females |
|
|
Age Structure |
The relative number of organisms of each age w/i a population |
|
|
What structures are used to determine age? |
-Tooth wear -Plumage changes -Growth rings, horns, ear bones, etc -Diameter at breast height |
|
|
What organisms are sometimes hard to age? |
Invertebrates. B/c they have no permanent hard parts. |
|
|
What are some passive means of dispersal? |
-Gravity -Wind -Water -Animals |
|
|
Capture-Recapture/Mark-Recapture methods |
Based on trapping, marking, and releasing a known number of marked animals (M) into the population (N). Some time later, the same population is sampled & the ratio of marked (m) to sampled (n) individuals in the second sample represents the ratio for the entire population. |
|
|
How does one find N |
N/M=n/m N=nM/m |
|
|
Migration |
Is a round Trip |
|
|
Indices of Abundance |
The counts of vocalizations, scat, tracks, or some other sign of presence |
