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CHAPTER 14 Animals of the Pelagic Environment http://www.aloha.com/~lifeguards http://www.yoto98.noaa.gov/books/whales http://www.fineartradiography.com/images/nautilus-pos.jpg How to avoid sinking Increase buoyancy Gas containers ○ Rigid container such as shells (internal or external) or… ○ Swim bladder Fig. 14.2 http://www.geocities.com/darthdusan/nautilusNYCaquarium.jpg http://www.rpgroup.caltech.edu/~natsirt/aph162/webpages/dylanandco/lab1/image How to avoid sinking Float – less dense than SW or neutral Microscopic zooplankton have shells or tests ○ Radiolarians ○ Foraminifers ○ Copepods Macroscopic zooplankton may have oil droplets Krill (resemble mini-shrimp or large copepods) http://www.ucmp.berkeley.edu/people/klf /MicroGalleryLarge_files/Forams1.jpg Foraminifers Fish egg with oil droplet Krill http://www.sfos.uaf.edu/research/arcdiv/watercolumn/euphausiid/images Figure 14.6 How to avoid sinking Floating macroscopic zooplankton Cnidarians Hydrozoan (Portuguese man-of-war) gas-filled float Scyphozoan (jellyfish) soft low-density bodies http://www.aboututila.com/Photos/AdamLaverty/ http://i184.photobucket.com/albums/x245/Aquaman1956/fish_swimming.gif How to avoid sinking Active swimming Fish – swim by curving body from front to back Fig. 14.9 http://www.jupitergreetings.com/fil es/anims/thumbnails/266_sm.gif http://www.wissenschaft-online.de/sixcms/media.php/591 http://www.mbari.org/news/news_releases/2001/dec21_clague/squid_swimming-400.jpg How to avoid sinking Unknown deep sea squid Active swimming – Squid Swim by trapping water and expelling it Also swim by using fins http://www.smithsonianmag.si.edu/smithsonian/issues96/may96 http://www.fishingnj.org/jpegs How to avoid sinking Active swimming sea turtles use flippers marine mammals use up/down tail movements Sperm whale http://www.flmnh.ufl.edu/fish/southflorida/everglades/estuarine/images/ http://www.biltek.tubitak.gov.tr/canlilar/img Fin designs in fish Vertical fins as stabilizers – dosral and anal fins Paired pelvic fins and pectoral fins for “steering” and balance Tail fin (caudal) for thrust http://www.biologycorner.com/resources/fish_fins.gif Fin designs in fish Rounded caudal fins flexible, maneuver at slow speeds Truncate fins and forked fins, useful for both maneuvering and thrust Lunate fins rigid, lots of thrust for fast swimmers Heterocercal fins asymmetrical, lift for buoyancy (shark) Fin designs in fish Fig. 14-10a http://www.emeraldinsight.com/fig/0170960108002.png Adaptations for finding prey Mobility Lungers wait for prey and pounce (grouper) Mainly white muscle tissue Cruisers actively seek prey (tuna) Mostly red muscle tissue Adaptations for finding prey Swimming speed Speed generally proportional to size Can move very fast for short time (mainly to avoid predation) http://images.inmagine.com/img/imagezoo/iz125/iz125022.jpg http://chemistry.csudh.edu/faculty/jim/cozmay06best/barracuda.jpg Adaptations to finding prey Most fish cold-blooded but some are warmblooded Homeothermic-body temperature above sea water temperature Modifications in circulatory system Mainly in fast-swimming fish http://www.sciencedaily.com/images/2005/10/051031133653.jpg Adaptations of deep-water nekton Mainly fish that consume detritus or each other Lack of abundant food Bioluminescence Fishing lures Large, sensitive eyes Anglerfish w/ males http://www.antoranz.net/CURIOSA/ZBIOR2/C0301 Lanternfish http://www.lifesci.ucsb.edu/~biolum/organism/pictures/myctophid1.jpg Adaptations of deep-water nekton Large sharp teeth Expandable bodies Hinged jaws Gulper eel http://www.floranimal.ru/pages/animal/b Adaptations of deep-water nekton Fig. 14-13 Figure 14.12 Adaptations to avoid predation Schooling “Safety in numbers” School may appear as single larger unit Schooling maneuvers confuse predator http://www.oceanbrite.com/gallery/d/811-2/Fish_School.jpg Some taxonomy…… Fish Kingdom Animalia ○ Phylum Chordata Class Chondrichtyes – cartilaginous fish - Sharks, rays Class Osteichthyes – bony fish Marine Mammals Kingdom Animalia Phylum Chordata ○ Class Mammalia Order Carnivora - Sea otters - Polar Bears - Pinnipeds – Family Odobenidae (walrus), Family Otariidae (Sea lions), Family Phocidae (seals) Order Sirenia - Manatees and dugongs Order Cetacea - Whales Whales Kingdom Animalia Phylum Chordata ○ Class Mammalia Order Cetacea - Suborder Odontoceti (toothed whales – dolphins, orcas, sperm whales) - Suborder Mysticeti (baleen whales – blue whale, gray whale) http://www.colonialzone-dr.com/images/manatee%20mother%20and%20calf.jpg Marine mammals Land-dwelling ancestors Warm-blooded Breathe air Hair/fur Bear live young Mammary glands for milk http://images.aad.gov.au/img.py/8bb.jpg http://www.sierraclub.org/compass/uploaded_images/otter-700966.jpg Marine mammals Carnivora Prominent canine teeth Sea otters Polar bears http://www.gaszappers.com/wp-content/uploads/2007/04/3-lazy-polar-bears.jpg http://www.birdsasart.com/Sea-Otter-wpup-_T9J9119-Cordova,-AK.jpg http://images.livescience.com/images/071008-walrus-04.jpg Marine mammals Carnivora Pinnepeds ○ Walruses Eat crustaceans with tusks ○ Seals http://www.cambriarealty.com/images/seal_pic1.jpg Marine mammals http://www.naturetrek.co.uk/newsletter/images/200796947570.Galapagos-Sea-lion-and-pup.jpg Carnivora Pinnepeds ○ Sea lions ○ Fur seals http://neilshedden.com/africa/images/animals/seals3.jpg Marine mammals http://www.nepa.gov.jm/yourenv/biodiversity/Species/gifs/manatee.jpg Sirenia Herbivores Manatees ○ Coastal areas of tropical Atlantic Ocean Dugongs ○ Coastal areas of Indian and western Pacific Oceans http://www.cnsweb.org/digestvertebrates/Photos/Dugong%20CL25_1b.jpg http://www.solcomhouse.com/images/wszhale.gif Marine mammals Cetacea Stream-lined bodies for fast swimming Specialized skin (dermal ridges) structure for fast swimming Whales Toothed - carnivores Baleen – filter feeders http://faculty.mccfl.edu/rizkf/OCE1001/Images/whales2.jpg http://www.alaska-passages-yacht-charters.com/breach_1.gif Cetacea Fig. 14.18 http://www.flheritage.com/facts/symbols/images/symbols/porpoise.jpg Marine mammals Dolphins vs. porpoises Dolphins (Delphinidae) ○ 35 species ○ Beaks Bottlenose dolphin ○ melon (fatty organ in forehead) ○ Prominent, curved dorsal fin ○ conical, undifferentiated teeth ○ Range in size from 1.5 m Hector's dolphin to 9 m killer whales Porpoises (Phocoenidae) Harbor porpoise ○ 6 species ○ Lack prominent beak ○ laterally compressed teeth ○ More triangular dorsal fin http://www-heb.pac.dfo-mpo.gc.ca/community/ education/images/harbourporpoise/teeth2_small.gif http://cache.eb.com/eb/image?id=94551&rendTypeId=4 http://www.keanani.com/dolphin_Animation.gif http://www.freewebs.com/cetaceanrc/SpermWhale1.jpg Cetacea Adaptations for deep diving Use oxygen efficiently ○ Able to absorb 90% of oxygen inhaled ○ Able to store large quantities of oxygen – high levels of myoglobin and hemoglobin ○ Able to reduce oxygen required for noncritical organs ○ Slowed cardiac rate Muscles insensitive to buildup of CO2 Collapsible lungs http://www.uwrf.edu/biology/electives_dir/444_dir/VSmith/Page1.html#skin Adaptations for deep diving Sperm whales can dive up to 1 hour, 52 min. and to 3 km deep http://www.uwrf.edu/biology/electives_dir/444_dir/VSmith/Page1.html#skin http://hearingresearch.net/pix/FultonCaldwell.gif Cetacea Suborder Odontoceti (toothed) Dolphins, porpoises, killer whale, sperm whale Echolocation to determine distance and direction to objects ○ Clicks produced in nasal air sacs are focused by the melon ○ Echos received thru lower jaw middle ear Determine shape, size of objects http://www.palaeos.com/Vertebrates/Units/520Cetartiodactyla/520.100.html http://www.nodium.com/wp-content/img/article/503.jpg Intelligence in toothed whales Large brains relative to body size Communicate with each other Brains convoluted Trainable Are they intelligent? http://serendip.brynmawr.edu/bb/kinser/images/jerison1.gif Cetacea Suborder Mysticeti Fig. 14.23 Right whale baleen Baleen whales Blue whale, finback whale, humpback whale, gray whale, right whale Fibrous plates of baleen sieve prey items Vocalized sounds for various purposes Right whale feeding http://www.coastalstudies.org/what-we-do/right-whales/fieldnotes.htm http://www.howardhall.com/stories/Gray%20Whale1H.jpg Gray whale migration 22,000 km (13,700 mi) annual migration from coastal Arctic Ocean to Baja California and Mexico Feeding grounds in Arctic (summer) Breeding and birthing grounds in tropical eastern Pacific (winter) Fig. 14-25 Whales as endangered species Fewer whales now than before whaling International Whaling Treaty Hunting of gray whale banned in 1938 Gray removed from endangered list in 1993 as population rebounded Fig. 14.26 http://typingisnotactivism.files.wordpress.com/2008/02/japan-whaling-2008.jpg Marine reptiles http://www.flmnh.ufl.edu/fish/southflorida/everglades/estuarine/images/ ○ Sea turtles Prey depends on species Greens eat seagrass (gut flora digests cellulose) Loggerheads eat conch Leatherbacks eat jellyfish Nest on beaches: predation, lights on dunes Many overexploited Green Loggerhead Leatherback http://swfsc.nmfs.noaa.gov/PRD/PROGRAMS/turtles http://www.fws.gov/endangered/i ○ Marine iguanas of Galapagos Islands Feed on submerged algae Dive for up to 20 minutes Must surface before they become too cold and can’t climb out of water http://www.surtrek.com/en/images/P rogram_pics/photogallery/gps http://www.exzooberance.com/virtua l%20zoo/they%20walk/iguana ○ Sea snakes of Pacific Highly poisonous Truly aquatic - reproduce in water - livebearers http://www.oceanbrite.com/albums/Fiji/ http://www.gbrmpa.gov.au/corp_site/info_services/publications/sotr/1998/photos