L8 Bevan - Pinniped Diversity and Adaptations Flashcards
How do Phocidae and Otariidae each hunt?
Phocidae - shallow and several deep diver species
Otariidae - shallow divers chasing fast swimming fish
What family do walruses belong to?
Odobenidae
How endangered are Hawaiian Monk Seals?
- CR
- about 1000 animals remaining and still declining at 4% per year
- due to habitat loss, food limitations, and bycatch
- larger males polygynous
How endangered are Mediterranean Monk Seals?
- most critically endangered
- decline due to human activities - hunting, habitat loss, disease, bycatch
What species of Monk Seal is already extinct and why?
The Caribbean/West Indian Monk Seal was declared extinct in 2008.
Intensive exploitation for centuries for their skin and oil
What is the function of the leopard and crab eater seals dentition?
Teeth interlock but with gaps and holes in as theyre specialist feeders on Krill
Leopard Seal:
a) size
b) prey
c) hunting style
d) specialisation
a) second largest seal species (elephant seal beats it)
b) orcas and large sharks are their only natural predators
c) hunt in shallow waters and don’t dive deep like other Antarctic deals
d) Have a fliptop jaw
What are the 3 types of seal that live in the Antarctic?
Leopard, Crabeater and Weddell
What 2 kinds of seal live in the northern hemisphere?
Grey, Common/Harbour Seal, Galapagos Fur Seals
Where are and how big are the 3 populations of Grey Seal?
- Western Atlantic-Canada and the USA
- Easter Atlantic - centred around the UK and Ireland, stretching as far north as Iceland and Norway. Additional small groups of Germany, Holland and France
- Baltic Sea
How are the 3 populations of grey seal different?
All 3 populations are genetically and morphologically different, and also have different timed breeding seasons
