RMOT 101 Marine mammals Day 1
🇬🇧
In Inglés
In Inglés
Practique preguntas conocidas
Manténgase al día con sus preguntas pendientes
Completa 5 preguntas para habilitar la práctica
Exámenes
Examen: pon a prueba tus habilidades
Pon a prueba tus habilidades en el modo de examen
Aprenda nuevas preguntas
Popular en este curso
Aprende con fichas
Modos dinámicos
InteligenteMezcla inteligente de todos los modos
PersonalizadoUtilice la configuración para ponderar los modos dinámicos
Modo manual [beta]
El propietario del curso no ha habilitado el modo manual
Otros modos disponibles
Completa la oración
Escuchar y deletrearOrtografía: escribe lo que escuchas
elección múltipleModo de elección múltiple
Expresión oralResponde con voz
Expresión oral y comprensión auditivaPractica la pronunciación
EscrituraModo de solo escritura
RMOT 101 Marine mammals Day 1 - Marcador
RMOT 101 Marine mammals Day 1 - Detalles
Niveles:
Preguntas:
27 preguntas
| 🇬🇧 | 🇬🇧 |
| Pinnipedia characteristics | • Have flipper-shaped hands and feet for swimming • very thick blubber • bear young on land |
| Family Otariidae characteristics | • external ear flaps • Can rotate their rear limbs under their body, lift their head and shoulders above ground • Can walk on land ok • Swim by moving forelimbs, use hind limbs for stability |
| Stellar sea lion physical characteristics | • Largest Otariid • Females ~ 1/3 the weight of males • Golden brown colour call is a "roar" |
| What status are BC stellar sea lions? | Special Concern & Blue Listed |
| When and where do stellar sea lions breed? | June and July in outer coast rookeries (e.g., Scott Islands, Cape St. James) |
| Stellar sea lion prey | Pollock, hake, dogfish and salmon. Winters = herring and eulachon in Straight of Georgia |
| California sea lion physical characteristics | • Smaller than Stellers • Fur is dark brown • Adult males have brow ridge (“indented forehead”) • Utters a “honking bark” |
| California sea lion diet | Hake, herring, salmon |
| Northern fur seal characteristics | • Dense & soft dark gray brown fur • long whiskers, pointed noses, long hind flippers |
| Northern fur seal status | Red listed, Threatened - Hunted extensively for fur in 1800s |
| Northern fur seal habitat and diet | • Mainly found offshore; occasionally seen in coastal waters • While in BC, feed on herring & salmon |
| Northern fur seal reproduction and migration | • Breed on Prilobof Island in Berring sea during summer • Females and juveniles migrate south to California |
| Northern fur seal reproduction and migration | • Breed on Prilobof Island in Berring sea during summer • Females and juveniles migrate south to California |
| Family Phocidae characteristics | • Cannot rotate hindlimbs under body • Therefore move awkwardly on land (“wriggle”) • Swim using their hind limbs and steer with forelimbs • Lack external ear flaps |
| Harbour seal characteristics | - sexes are similar in size - Usually mottled grey in appearance |
| Harbour seal diet and habitat | • Opportunistic feeders on several fish • Pups often left on shore while mother forages • Found all along BC coast • Usually seen resting on “haul outs’ (e.g. rocky reefs, sand bars, log booms) • Apparently little social structure in haul outs |
| Northern elephant seal migration and distribution | • Breed on northern California beaches in winter • In BC from spring to fall; often seen hauled out on Race Rocks |
| Northern elephant seal feeding | • Feed mainly offshore (dogfish, pollock, hake) • Excellent deep sea divers |
| Northern elephant seal feeding | • Feed mainly offshore (dogfish, pollock, hake) • Excellent deep sea divers |
| Order Cetacea characteristics | Lack hind limbs Nostrils on top of head Swim using up and down movement of tail |
| Suborder Odontoceti (toothed whales) characteristics | • Have homodont dentition (teeth are all same shape) • Single blow hole (other nasal passage modified for echolocation) • Most have a complex social structure |
| How do you tell male and female orcas apart? | Males = Long straight dorsal fin Females = shorter curved dorsal fin |
| Characteristics of resident killer whales | - very vocal, travel in matrilineal family groups (pods) of 5-50 whales - 19 pods in BC, each with different dialects - feed primarily on fish, especially chinook salmon - divided into northern and southern populations |
| Characteristics of transient killer whales | - smaller groups of 2 to 5 individuals that may or may not be related - vocalize less than residents; dorsal fins more pointed at tip than residents - feed exclusively on warm-blooded prey e.g. seals, sea lions and porpoises |
| Characteristics of offshore killer whales | - mainly seen beyond continental shelf; travel in groups of 25 or more - have different vocalizations than residents and transients - Rarely seen not much known about their social structure or diet |
| What is the status of each of the killer whale populations in BC? | - Southern resident = Red listed/endangered - Northern resident = Threatened, Blue listed - Transient = Threatened, Red listed - Offshore = Threatened, Blue listed |
| What are some potential reasons for the recent drop in orca populations? | – accumulation of environmental toxins (e.g., PCBs) – fluctuations in prey species (e.g., decreases in salmon runs) -- Some concern eco-tourism affecting feeding behaviour |