Vertebrate of BC Part 2 Flashcards Preview

Biology > Vertebrate of BC Part 2 > Flashcards

Flashcards in Vertebrate of BC Part 2 Deck (484)
Loading flashcards...
211

Cetacean length

Blue Whale 27m
Sperm Whale 18m
Humpback 15m
Gary Whale 15m
Orca 9m
Bottle-Nose Dolphin 2.5m

212

Odontocetes

toothed whales
smaller, fast moving
single blowhole
acoustic
chase prey

213

Killer Whale

Orcinus orca
Delphinids (dolphin)
3 types
female dominated social structure
tell apart by prey, dorsal fin, saddle patch, calls

214

Orca groups

resident
Bigg's (transient) - mammal eater
offshore - shark eater

215

Pacific white-sided dolphin

Lagenirhynchus obliquidens
Delphinids
often in groups
inshore and offshore
~7.5ft , gregarious, showy

216

Harbour porpoise

Phocoena phocoena
Elusive, small group, acoustically sensitive, hybridize, ultrasonic frequency- one of highest frequencies of all mammal

217

Dall's porpoise

Phocoendoides dalli
Fastest cetacean in BC
often confused with orca
bow rider, hybridize, 'friendly', swim 55km/hr, splash

218

Sperm whale

Physter macrocephalous
past shelf break, don't see often here, 1/3 body mass is head - sonar, echo location, fish in complete darkness

219

sperm whale length of time under water

up to 1hr
60min under water = 60 blows

220

BC Odontocetes

Orcas, Pacific white-sided dolphin, Harbour porpoise, Dall's porpoise, Sperm Whale

221

Mysticetes

baleen whales
larger bodies
two nostrils form blow hole
"moustached whale"
engulf prey

222

how to find patchy prey

get big, move efficiently through water -- bigger = bigger mouth = more efficient

223

Humpback whale

Megaptera novaeangliae
dorsal fin rests on hump
often solitary, migrator, acrobatic, primarily small fish feeders, fall anchovata populations

224

Gray Whale

Eschrichtius robustes
solitary, population recovering from whaling, benthic feeder

225

Minke whale

Balaenoptera acutorostrata
elusive, solitary, smallest baleen, common, sporadic, generally small fish feeder, can fall prey to orca

226

Fin whale

Balaenoptera physalus
commonly in offshore waters of N BC, second largest of all whales, density unknown, heavily whaled, very fast, ID by right lower lip

227

Sei whale

Balaenoptera borealis
big target for whaling, drive herring, small fish feeder

228

Blue whale

Balaenoptera musculus
150 tonnes, population significantly reduced, largest animal on earth (possibly ever), not well known, not easily studied, driven off by sonar

229

North Pacific right whale

Eubalaena japonica
huge baleen - up to 15ft, heavily whaled for baleen, copepod feeder

230

Pinnipedds

limbs resemble terrestrial animals, blubber and hair, tactile, vocal
Stellars Sealion, California sea lion, Harbour seals, Sea otter, River otter, Northern fur seal, Northern elephant seal

231

Mysticetes

Humpback whale, Gray whale, Minke whale, Fin whale, Sei whale, Blue whale, North Pacific right whale

232

Pinniped acoustics

Adjusted for under and above water hearing

233

Stellar's Sealion

Eumetopias jubatus
spp. moterirnsis (Laughlin's), haulout, mate at rookeries, sexually dimorphic m>>f, roar, can rotate hind quarters to pull themselves up (unlike seals)

234

California sea lion

Zalophus californianus
Bark, sexual dimorphic, polygamous, dog-like face, crest on front of head @ sexual maturity

235

Harbour Seals

Phoca vitulina richardsi
common, 'true'/earless seal, rarely fight, eyes change shape for in/out water, territorial, don't like to touch each other

236

Sea otter

Ehydra lutris
Heaviest weasel, smallest marine mammal, fur not blubber, rarely leave water, dive deep for food, backwards feet

237

River otter

Lontra canadensis
versatile on land/water, den builder, latrine sites,

238

thickest/most dense hair of all mammals

sea otter
traps air

239

Northern fur seal

Callorhinus ursinus
rare here, up to 7ft, 'true' seal, f live 3X males

240

Northern elephant seal

Mirounga angustirostgis
'trunk' in male, f