1-29-09 Mammalian Predators
Conservation Biology 250 with Strange at University of Tennessee - Knoxville
About this deck
By: Anna Claire Randolph
Textbook:
Natural Resource Conservation: Management for a Sustainable Future (9th Edition)
Created: 2009-04-27
Size: 13 flashcards
Views: 21
Textbook:
Natural Resource Conservation: Management for a Sustainable Future (9th Edition)Created: 2009-04-27
Size: 13 flashcards
Views: 21
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Bears
- descending in size
- polar, grizzly, black
Polar bears
- 10 ft tall
- arctic habitat (Siberia, Alaska)
- adapted to life in far North
- Mostly carnivorous
- aquatic-based diet
- seals, fish
- hunt around seal breathing holes
Problems with polar bears in the Mid 20th cent
- - Poaching hunted aggressively
- No cover->vulnerable to modern hunting methods
Polar bear problems in 1970 and 1990
- Soviet Union, Canada, and US begin to protet polar bear
- 1990-population resurging, hunting controlled, habitat intact
21st cent problems with polar bears
- loss of habitat
- global warming shrinks ice cap
- drown swimming across to other ice packs
Grizzly
- Brown/Kodiak
- Access to salmon that come upstream to spawn on seaside of Continental Divide->bigger size
- Old World Brown
- Northern habitat (Canada, Alaska, Northern Rockies)
- Nuts, berries, insects, meat (not as carnivorous as polar bear)
Grizzly problems
- Climate change
- loss of trees and assoc. insect species for diet
- dangerous bear-human interactions
Black habitat
forested NA habitat
Food of Black
- some small game (deer), grubs, insect larvae, mast (least carnivorous)
- soft mast-berries, summer fruits, relatively low energy
- Hard mast-acorns
- makes or breaks wildlife population
- oak trees do not provide steady, stable acorn crop
Hibernation
- sleep most of winter; stetch, wake up on warm days
- females have cubs (most mammals have offspring in summer)
- breed in spring; eggs fertilized in female fallopian tubes
- Delayed implantation-egg in suspended animation in fallopian tubes
- no growth, no implantation in uterus, no placenta formation
- implanted in fall
- feed vigorously to create fat stores to sustain cubs with milk production
- Females den earlier than males (Nov vs. Jan)
- Hollow tree dens
Malnutrition for black
- poor acorn crops
- ->roaming, migrating for food->closer to human populations
Hunted blacks
- ->extirpated from Eastern NA
- Solution: legal bear season opens after females are denned
Human-black bear interaction
- Habitats overlap more than other bears and humans
- Usually no unprovoked black bear attacks
- Bluff charge
- few mortalities from human-bear interactions
- intentional feeding
- Garbage/waste
- solution:education, trap and move once bear has been fed
About this deck
By: Anna Claire Randolph
Textbook: Natural Resource Conservation: Management for a Sustainable Future (9th Edition)
Created: 2009-04-27
Size: 13 flashcards
Views: 21
Textbook:
Natural Resource Conservation: Management for a Sustainable Future (9th Edition)Created: 2009-04-27
Size: 13 flashcards
Views: 21
About StudyBlue
STUDYBLUE makes things that make you better at school.
Things like online flashcards with photos and audio.
Things like personalized quizzes and friendly reminders about when (and what) to study next.
Think of it as a digital backpack™: access to all of your study materials online and on your phone.
STUDYBLUE exists to make studying efficient and effective for every student, for free. Join us.
“I have been getting MUCH better grades on all my tests for school. Flash cards, notes, and quizzes are great on here. Thanks!”
Kathy
Kathy