SIO133 Study Guide: Week 6 5/12/ Great Job on the midterm. If you need help please let us know.
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1 Lecture 15. Anthropogenic noise and marine mammals Lecture 16. Anatomy - Skulls Lecture 17. Locomotion Announcements: 1. Great Job on the midterm. If you need help please let us know. 2. Outlines for term papers due today Monday May th Week 5: Anthropogenic noise and marine mammals wrap- up Practice questions 1) What are some sources of anthropogenic sound in the sea? What are some natural sources of sound in the sea? 2) What are 5 ways that anthropogenic sound is thought to impact marine mammals? 3) What are SPL and SEL and how do they relate to sound exposure? 4) What is the gas bubble growth hypothesis regarding beaked whale stranding events? 5) What is the dinner bell effect? Lecture Review: Skull Anatomy 1. Form directly relates to function. a. Life history/amount of time in water are directly apparent in the anatomy of the skull. b. Skulls are just tools tools to make a living efficiently (everything is under selection). NOTE: Some tools are specialized while some are general: think about pliers i. Skulls are tools for what? What do they hold? What do they control? ii. Bones of the skull are tools for what? What do they hold? What do they do? iii. Jaws are tools for what? Some are long and some are short why? And in whom?
2 iv. Teeth are tools for what? Homo/hetero- dont what does this tell you about what the animal is doing with its teeth? 2. Skull Size varies widely across marine mammals as does the amount and placement of soft tissue around the skull. Think about sperm whales, right whales and sea otters. Why would the sizes vary? 3. Bones of the skull all marine mammals have the same basic bones although they vary in placement, size and function. A. Tooth- bearing bones: Function (s): food capture and mastication. Names: Top maxilla and premaxilla. Bottom mandibles (AKA Dentaries). B. Airway bones: Nasals C. Food- handling bones: Hyals D. Protection: Frontal, parietal, temporal, occipitals, Jugal/zygomatic arch E. Hearing: See last week s lectures. F. Attachment: Parietal, frontal, temporal, occipitals, jugal/ Zygomatic arches: small and slim in cetaceans 4. Other features of the skull A. Teeth: otters: crushing; Shearing molars: seals/sea lions. Dolphins grasping; Manatees: grinding; Baleen filtering; Manatees just have cheek teeth no incisors continuously replaced throughout life. B. Foramina: ducts for nerves and blood vessels: Mental (on the mandibles). C. Fossa: Temporal fossa massive area for muscle attachment of the jaw muscles D. Processes: i. Ramus (process where muscles attach) bigger in pinnipeds, sirenians; smaller for dolphins ii. Condyls (hinges): Occipital condyls are the big one at the base of the skull. Point down in pinnipeds. Straight back in cetaceans. Mandibular codyle is iii. Mandibular symphysis (joining of bones) fused early in manatee life, older in dolphins, never in mysticetes because need flexibility for lunge feeding
3 Soft Tissues: - Nerves and blood vessels to follow the movement of bones and the pushing of airways. - Reorganization of feeding and breathing structures. Airways cross with feeding tudes and are completely separate. Goosebeak structure. NO epiglottis. - Sperm whale is most extreme! Post- Cranium and Locomotion: Parts: Vertebral column and appendicular skeleton (limbs and girdles) Function: Support and protect soft tissues also gives animal overall form. A. Vertebral Column: i. Individual Vertebrae Centra, Neural Arch/Canal and Neural Spines and Transverse Processes ii. Intervertebral discs (just as they sound) and zygapophyses (areas of overlap between two vertebrae - allow for movement (flexibility/rigidity of the column iii. Regions of column - : 1. Cervical neck 2. Thoracic chest Also in this region: vertebral ribs/sternal ribs/sternabrae all odontocetes, most mysticetes and manatees 3. Lumbar lower back 4. Sacral attached to pelvis (gone in cetaceans and sirenians) 5. Caudal tail Internal Structures: - The diaphragm divides the body cavity in two. a. Above (cranial to the diaphragm) Heart (Pericardium); Plural Cavities (lungs); Mediastinum (nerves and lymph nodes) b. Below (Caudal to the diaphragm)
4 - Liver/Gall bladder, Urogenital, Adrenal Glands - Digestive (a lot of variation several stomachs in cetaceans), HUGE in manatees - Mammary glands: - Caudal and ventral in cetaceans (slits) and pinnipeds - Anterior and ventral (arm- pit area) Appendicular Structures: 1. Forelimbs: No clavicle in cetaceans. Scapula is only attached to vertebrate by muscle. Olecranon (elbow) processes developed in sea lion and polar bear. Cetaceans arms are immobile elbow. 2. Pelvis/Hind limbs: Cetaceans/Sirenians have pelvic vestige (has a purpose reproductive attachment). Seal lions have shortened tibia/fibula and big feet. 3. Flukes: Only vertebrae no other bony support. Indicates swim speed. Narwal Question in Class!! 4. Dorsal fins: in general to prevent rolling during swimming. No bones - a lot of variation. ====================== Terrestrial Locomotion: - Otariids - can walk/hop/gallop(?) even. Phocids caterpillar motion. Odobenids heavy belly on ground use heads to throw weight forward. Locomotion in water: Fusiform shape. Evolution of cetaceans. Quadrupedal - > pelvic paddling - > caudal undulation (think flexing of the spine kinda like sea otters) - > caudal oscilation (more efficient thunniform swimming restricted to caudal region.
5 Practice Questions: 1. What are foramen and fossa? What are their functions? What can they tell you about the life style of the animal? 2. Contrast the position of the nasal, maxilla, premaxilla and foramen magnum in pinnipeds vs. cetaceans. 3. Is the braincase large in mysticetes, relative to body size? Why? 4. What are the different soft tissues involved in sound production and reception? 5. What is the diaphragm and what does it do? 6. List two marine mammals with sexual dimorphism. 7. Why do beaked whales have dense head bones? 8. Are the arm bones in cetaceans longer or shorter relative to body size than ours? Why? 9. Large- wide pectoral flippers indicate swim speed and maneuverability.
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