Term
|
Definition
| The consumptive use of a natural resource. |
|
|
Term
|
Definition
| The consumptive use of a natural resource beyond its capacity to replenish. |
|
|
Term
| Non-timber forest products (NTFP) |
|
Definition
| Fruits, nuts, oils, seeds, resins, gums, etc. Many are harvested traditionally in extractive preserves. May have positive or negative effect. |
|
|
Term
| Theory of Sustainable Exploitation |
|
Definition
| Most species density dependent - populations fluctuate around mean density (carrying capacity). |
|
|
Term
|
Definition
| Maximum # individuals. When carrying capacity reached, drops to 0. |
|
|
Term
|
Definition
| Difference between births and deaths in a population. |
|
|
Term
| Maximum Sustainable Yield (MSY) |
|
Definition
| Harvest level that will maximize yield over long periods; rarely happens b/c of overexploitation, natural pop. fluctuation, & many variables difficult to determine. |
|
|
Term
| Constant Quota Exploitation |
|
Definition
Quota set at constant level independent of population size; does not change over time (not a good biological assumption). Many fisheries historically managed this way.
High quota: pop. decline every year to extinction
MSY quota: pop. drops below MSY # then will decline
Low quota: pop. sustained and possibly increased in size over time |
|
|
Term
| Proportional Exploitation |
|
Definition
| Exploitation directly tied to pop. size. Yield = pop. size x exploitation rate. If exp. rate lower than growth rate, should be sustainable; if not extremely high, pop. should be maintained over time. Limitations - must determine accurate pop. size. |
|
|
Term
|
Definition
| If pop. exceeds carrying capacity, rate of exploitation can increase to take advantage of surplus. Limitations - amount of harvest and revenue varies each year; works on personal level, but not w/ corporations. |
|
|
Term
| Yield per Recruit - Exploitation |
|
Definition
| Keep track of factors that add to and subtract from population. Goal - maximize factors that lead to pop. growth and minimize natural mortality. Recruit(individual) = maximum value when reaches max. size w/ low risk of mortality. Limitations - requires a lot of species data. |
|
|
Term
| Full Demography - Exploitation |
|
Definition
| Demography: Statistical study of pop. dynamics. Individuals divided into classes based on age/size/repro. status. Impact of management activities examined for each class. Limitations - lack of good data for threatened/endangered sp. |
|
|
