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first year > Marine Vertebrates > Flashcards

Marine Vertebrates Flashcards

1
Q

Elasmobranch development

A

Viviparity
Oviviparity
Oviparity

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2
Q

Viciparity

A

Parents provide nutrients during development

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3
Q

Oviviparity

A

Nutrients provided from eggs retained within the body

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4
Q

Oviparity

A

Development occurs within egg cases which are laid

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5
Q

Gonochoristic

A

Separate sexes

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6
Q

Wrasse polygyny

A

Male maintains a harem of females, when male dies biggest female becomes male

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7
Q

Phocid seals

A

Side to side movement

85-90% of time submerged

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8
Q

Otariid seals

A

Can walk on land or move like a tripod

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9
Q

Population change eqn

A

Mortality + emigration

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10
Q

Lack’s hypothesis

A

Density dependent mortality, only major importance factor is food

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11
Q

Ashmole’s hypothesis

A

Based on tropical birds with a constant food supply

Density dependent food competition during breeding season

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12
Q

Wynn-Edwards hypothesis

A

Birds regulate their numbers due to social interactions
Prudential restraint due to competition
Very unlikely hypothesis

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13
Q

Periarterial venous retes in fins

A

Blood changes which veins it flows through to conserve heat

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14
Q

Diadromous migrations

A

Between the sea and freshwater

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15
Q

Phocid seals spines

A

Transverse

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16
Q

Otariid seals spines

A

Neural

17
Q

Sea snake respiration

A

Cutaneous

18
Q

Cetacean blowholes

A

External nares

19
Q

Baleen

A

Strong flexible material made of keratin
Forms plates that han from rostrum
Mysticeti whales use it to filter prey

20
Q

Ghost fishing

A

Nets are lost at sea but continue to entrap marine organisms

21
Q

Echolocation

A

Used by odontocetes for navigation and foraging

Animals emit calls and listen to the echoes of returning calls

22
Q

Seahorse reproduction

A

Male becomes pregnant

Female deposits eggs into males pouch where he fertilises them

23
Q

Cetaceans

A

Whales dolphins and porpoises

24
Q

Odontoceti v Mysticeti whales

A

Toothed v baleen

25
Q

Pinniped eyes

A

Extensive pupillary contraction

Forms v narrow slits or possibly a pinhole

first year (3 decks)

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