Marine MammalsD. Diving

• Adaptations for long and deep dives

1. High hematocrit

2. Muscles rich in myoglobin

3. Reduction of heart rate

4. Flexible rib cage

5. Majority of oxygen in blood and tissues

Marine MammalsE. Echolocation

• Common in dolphins, porpoises, toothed whales • May occur in some baleen whales and pinnipeds

Dolphins Whales Whales

Marine MammalsF. Migration

• Baleen whales, pinnipeds• Toothed whales tend not to migrate

Marine MammalsF. Behavior

• Playful behavior

• Breeching

• Spy hopping

Ecology

EcologyA. Population Dynamics

• Under favorable conditions populations can grow rapidly

EcologyA. Population Dynamics

EcologyA. Population Dynamics

EcologyA. Population Dynamics

• Populations tend to be self-regulating• Populations grow until they reach carrying capacity

• Population growth and carrying capacity may be determined by limiting resource

• Limiting resources are different for different populations

EcologyB. Species Interactions

1. Intraspecific competition• Ex – Competition for algae by sea urchins

• Ex – Competition for shells by hermit crabs

2. Interspecies competition