Marine Mammals and Pinnipeds

Study Notes

Marine Mammals and Pinnipeds: Characteristics, Adaptations, and Differences

All cetaceans have a blowhole; toothed whales have one, while baleen whales have up to two.
The melon is an organ that allows toothed whales to emit/send sound waves out, and it can be of different sizes.
Echolocation is a sonar system present only in toothed whales, which allows them to sense objects in water and navigate, find food, detect prey, communicate, and attract/find a mate.
Baleen is a keratin plate that suspends from the mouths of some whales, used by filter-feeding whales to trap food like krill and fish in their baleen before swallowing it.
Myoglobin is a muscle protein that stores oxygen, used by marine mammals for deep diving.
Apneustic breathing is a series of breaths taken at the surface before submerging to dive, inhaling and exhaling at the surface.
The Marine Mammal Protection Act of 1972 is a federal law that protects all marine mammal populations, making it illegal to kill them without a permit, take samples, or approach them within 100 yards.
Marine mammals have basic characteristics such as large bodies, endothermy, hair-covered skin, viviparity, mammary glands, no cloaca, few well-cared-for offspring, well-developed brain, and protection by the Marine Mammal Protection Act.
Adaptations to prevent body heat loss in marine mammals include a streamlined body, major muscles on the body trunk, dense layers of hair and/or blubber, and limiting the amount of warm blood flow to the skin.
Pinnipeds include seals, sea lions, and walruses, which share some similarities such as being great swimmers, having a body shape that allows movement on land, hauling out, living in cold waters, and feeding on fish and squid.
Seals have short necks, rounded snouts, no external ear flaps, and swim with large hind flippers for propulsion, while sea lions have elongated/larger fore flippers, small external ear flaps, and swim with large pectoral/fore flippers.
Walruses are the only pinniped with tusks, which are used to find food and help them pull their bodies up on the ice, and they feed on marine invertebrates like clams and mud. Hawaiian monk seals are threatened by entanglement from lost/rogue fishing gear.

Description

Test your knowledge about marine mammals and pinnipeds with this informative quiz! From the characteristics and adaptations of these fascinating creatures to the differences between toothed and baleen whales, this quiz will challenge you to think critically about the world of marine life. Learn about the importance of the Marine Mammal Protection Act, the role of myoglobin in deep diving, and the various adaptations that allow these animals to survive in cold water environments. Discover the unique features of seals, sea lions, and