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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 - PowerPoint PPT Presentation
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CHAPTER 14 Animals of the Pelagic Environment
http://www.yoto98.noaa.gov/books/whaleshttp://www.aloha.com/~lifeguards
How to avoid sinking Increase buoyancy
Gas containers○ Rigid container such as shells (internal or external)
or…○ Swim bladder
Fig. 14.2http://www.geocities.com/darthdusan/nautilusNYCaquarium.jpg
http://www.fineartradiography.com/images/nautilus-pos.jpg
How to avoid sinking Float – less dense than SW or
neutralMicroscopic zooplankton have
shells or tests○ Radiolarians○ Foraminifers○ Copepods
Macroscopic zooplankton may have oil droplets
Krill (resemble mini-shrimp or large copepods)
http://www.rpgroup.caltech.edu/~natsirt/aph162/webpages/dylanandco/lab1/image
Fish egg with oil droplet
http://www.sfos.uaf.edu/research/arcdiv/watercolumn/euphausiid/images
http://www.ucmp.berkeley.edu/people/klf/MicroGalleryLarge_files/
Forams1.jpg
Foraminifers
Krill
Figure 14.6
How to avoid sinking Floating
macroscopic zooplankton
CnidariansHydrozoan
(Portuguese man-of-war) gas-filled float
Scyphozoan (jellyfish) soft low-density bodies
http://www.aboututila.com/Photos/AdamLaverty/
How to avoid sinking
Fig. 14.9
Active swimming Fish – swim by curving
body from front to back
http://www.wissenschaft-online.de/sixcms/media.php/591http://
www.jupitergreetings.com/files/anims/thumbnails/
266_sm.gif
http://i184.photobucket.com/albums/x245/Aquaman1956/fish_swimming.gif
How to avoid sinking 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
http://www.mbari.org/news/news_releases/2001/dec21_clague/squid_swimming-400.jpg
Unknown deep sea squid
How to avoid sinking Active swimming
sea turtles use flippers marine mammals use up/down tail
movements
http://www.flmnh.ufl.edu/fish/southflorida/everglades/estuarine/images/
http://www.biltek.tubitak.gov.tr/canlilar/img
Sperm whale
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 finsRounded caudal fins flexible,
maneuver at slow speeds
Truncate finsTruncate fins and forked finsforked fins, useful for both maneuvering and thrust
Lunate finsLunate fins rigid, lots of thrust for fast swimmers
Heterocercal finsHeterocercal fins asymmetrical, lift for buoyancy (shark)
Fin designs in fish
Fig. 14-10a
Adaptations for finding prey
Mobility LungersLungers wait for prey and
pounce (grouper)Mainly white muscle tissue
CruisersCruisers actively seek prey (tuna)Mostly red muscle tissue
http://www.emeraldinsight.com/fig/0170960108002.png
Adaptations for finding prey Swimming speed
Speed generally proportional to sizeCan 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 warm-bloodedHomeothermic-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
http://www.lifesci.ucsb.edu/~biolum/organism/pictures/myctophid1.jpg
Lanternfish
http://www.antoranz.net/CURIOSA/ZBIOR2/C0301
Anglerfish w/ males
Adaptations of deep-water nekton
Large sharp teeth Expandable bodies Hinged jaws
http://www.floranimal.ru/pages/animal/b
Gulper eel
Adaptations of deep-water nekton
Fig. 14-13
Figure 14.12
Adaptations to avoid predation SchoolingSchooling
“Safety in numbers”School may appear as
single larger unitSchooling maneuvers
confuse predator
http://www.oceanbrite.com/gallery/d/811-2/Fish_School.jpg
Some taxonomy……
FishKingdom Animalia
○ Phylum ChordataClass Chondrichtyes – cartilaginous fish
- Sharks, raysClass 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 dugongsOrder 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)
Marine mammals
Land-dwelling ancestors Warm-blooded Breathe air Hair/fur Bear live young Mammary glands for milk
http://www.colonialzone-dr.com/images/manatee%20mother%20and%20calf.jpg
http://images.aad.gov.au/img.py/8bb.jpg
Marine mammals CarnivoraCarnivora
Prominent canine teeth
Sea ottersSea ottersPolar bearsPolar bears
http://www.sierraclub.org/compass/uploaded_images/otter-700966.jpg
http://www.gaszappers.com/wp-content/uploads/2007/04/3-lazy-polar-bears.jpg
http://www.birdsasart.com/Sea-Otter-w-pup-_T9J9119-Cordova,-AK.jpg
Marine mammals CarnivoraCarnivora
PinnepedsPinnepeds○ WalrusesWalruses
Eat crustaceans with tusks
○ SealsSeals
http://images.livescience.com/images/071008-walrus-04.jpg
http://www.cambriarealty.com/images/seal_pic1.jpg
Marine mammals
CarnivoraCarnivoraPinnepedsPinnepeds
○ Sea lionsSea lions○ Fur sealsFur seals
http://www.naturetrek.co.uk/newsletter/images/200796947570.Galapagos-Sea-lion-and-pup.jpg
http://neilshedden.com/africa/images/animals/seals3.jpg
Marine mammals
SireniaSirenia Herbivores
ManateesManatees○ Coastal areas of
tropical Atlantic Ocean
DugongsDugongs ○ Coastal areas of
Indian and western Pacific Oceans
http://www.nepa.gov.jm/yourenv/biodiversity/Species/gifs/manatee.jpg
http://www.cnsweb.org/digestvertebrates/Photos/Dugong%20CL25_1b.jpg
Marine mammals Cetacea Cetacea Stream-lined bodies
for fast swimming Specialized skin
(dermal ridges) structure for fast swimming
WhalesToothed - carnivoresBaleen – filter feeders
http://www.solcomhouse.com/images/wszhale.gif
http://faculty.mccfl.edu/rizkf/OCE1001/Images/whales2.jpg
CetaceaFig. 14.18
http://www.alaska-passages-yacht-charters.com/breach_1.gif
Marine mammals Dolphins vs. porpoises Dolphins (Delphinidae)
○ 35 species○ Beaks○ 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) ○ 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
Harbor porpois
e
Bottlenose dolphin
http://www.flheritage.com/facts/symbols/images/symbols/porpoise.jpg
Cetacea Adaptations for deep
divingUse 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.keanani.com/dolphin_Animation.gif http://www.freewebs.com/cetaceanrc/SpermWhale1.jpg
http://www.uwrf.edu/biology/electives_dir/444_dir/VSmith/Page1.html#skin
http://www.uwrf.edu/biology/electives_dir/444_dir/VSmith/Page1.html#skin
Adaptations for deep divingAdaptations for deep diving
Sperm whales can dive up to 1 hour, 52 min. and to 3 km Sperm whales can dive up to 1 hour, 52 min. and to 3 km deepdeep
Cetacea Suborder OdontocetiOdontoceti
(toothed)Dolphins, porpoises, killer
whale, sperm whaleEcholocation 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://hearingresearch.net/pix/FultonCaldwell.gif
http://www.palaeos.com/Vertebrates/Units/520Cetartiodactyla/520.100.html
Intelligence in toothed whales
Large brains relative to body size
Communicate with each other
Brains convoluted Trainable Are they intelligent?
http://www.nodium.com/wp-content/img/article/503.jpg
http://serendip.brynmawr.edu/bb/kinser/images/jerison1.gif
Cetacea
Baleen whales Blue whale, finback whale,
humpback whale, gray whale, right whale
Fibrous plates of baleenbaleen sieve prey items
Vocalized sounds for various purposes
Suborder Mysticeti
Fig. 14.23
http://www.coastalstudies.org/what-we-do/right-whales/fieldnotes.htm
Right whale feeding
Right whale baleen
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
http://www.howardhall.com/stories/Gray%20Whale1H.jpg
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○ Sea turtlesSea turtles
Prey depends on speciesGreensGreens eat seagrass (gut
flora digests cellulose)LoggerheadsLoggerheads eat conchLeatherbacksLeatherbacks eat jellyfish
Nest on beaches: predation, lights on dunes
Many overexploited
http://www.flmnh.ufl.edu/fish/southflorida/everglades/estuarine/images/
http://www.fws.gov/endangered/ihttp://swfsc.nmfs.noaa.gov/PRD/PROGRAMS/turtles
Leatherback
Green
Loggerhead
○ Marine iguanas 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.exzooberance.com/virtual%20zoo/they%20walk/
iguana
http://www.surtrek.com/en/images/Program_pics/photogallery/gps
○ Sea snakes Sea snakes of Pacific Highly poisonous Truly aquatic - reproduce in water - live-
bearers
http://www.gbrmpa.gov.au/corp_site/info_services/publications/sotr/1998/photos
http://www.oceanbrite.com/albums/Fiji/