Whale Populations Unit
This unit looks at the population statistics for specific species of whales that sustain hunting pressure over the years. The common name, scientific name, pre-exploitation estimates and present estimates of their population is given.
Mathematical concepts include:
analysis of data average estimation percent division evaluate outcomes graphic representations of information use real world examples investigate open-ended problems
Other skills and concepts:
geography use of maps/charts environmental relationships
Given the information in the Estimates of Pre-exploited and Present Populations of Selected Whale Species table, complete or respond to the following.
1. What percentage of the original population of each species given is estimated to be remaining today?
2. What is the estimated average of all species remaining today?
3. Graph the results of the percentage remaining versus the species. Which type of graph would be appropriate to use with this data? Why?
4. Which population is in the most danger of becoming extinct? On what do you base this conclusion?
5. Both the Northern Right Whale and the Gray Whale were hunted to near extinction in the 1800's, which one recovered? Why do you think one recovered so much more successfully than the other? What might have inhibited the recovery of the less successful species?
6. What are some obstacles that whales face in their attempt to recover their population? What do these species need in order to recover their pre-exploitation numbers?
7. Which species of whales listed are observed off of the Mid-Atlantic states? Are there species not listed in the table that are observed off of the Mid-Atlantic states?
8. Locate on a map the geographic areas that these species inhabit.
|No. Right||Eubalaena glacialis||no estimate||1,000||N/A|
|No. Right||Eubalaena glacialis *||2,000||350||-|
|No. Right||Eubalaena glacialis *||10,000||350||-|
|So. Right||Eubalaena australis||100,000||3,000||-|
|Blue Whale||Balaenoptera musculus||228,000||14,000||-|
|Balaenoptera musculus *||228,000||2,000||-|
Data taken from OCEANUS, Vol. 32, No. 1., Spring 1989.
* Research data and estimates