phylum: chordata class: aves (birds). classification kingdom animalia ---phylum chordata...
TRANSCRIPT
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Phylum: Chordata
Class: Aves(Birds)
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Classification
Kingdom Animalia---Phylum Chordata------Subphylum Vertebrata---------Class Aves
Aviation = flight
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Order: ApodiformaHummingbird
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Tucan
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Order:Falconiformes
Peregrine falcon
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Order: Galliformes
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Dove
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Class: GaviiformesLoon
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Penguins
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Origin and Early Evolution
Evidence from fossils and studies of comparative anatomy indicates that birds evolved from reptilesTheir features and their fragile hollow bones do not preserve well.copyright cmassengale
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Evolution of Birds (from reptiles)• Archaeopteryx - “ancient
wing” • Reptile like - Had teeth in
beak, bony tail, claws on wings
• Bird like = Had feathers, & fused collarbone (wishbone)
• Could not fly – could glide for glide short distances
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Aves Characteristics1. Forelimbs modified into wings 2. Thin layer of epidermis; No sweat glands3. Feathers – made of keratin4. Hollow, lightweight bones 5. Endothermic6. Efficient respiration 7. Heart with a completely divided ventricle (4 chambers) 8. Scaled feet (birds are related to reptiles) 9. Furculum (wishbone)
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Body PlanBilateral symmetryForelimbs modified into wingsBony skeleton with air pocketsBeak, no teethSingle bone in the middle earEndothermic
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Skeleton
The sternum supports the large breast musclesThe humerus, ulna, and radius, along with the pectoral girdle and the sternum, support the wing.The pygostyle, the terminal vertebra of the spine, support the tail feathers, which also play an important role.
copyright cmassengale
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Feather Types1. Contour feathers
Has a hollow quill, main shaft, and barbs, barbulesCovers, streamlines body, and allows flight; coloration
2. Down feathersLight and fluffyconserve heat (birds are endothermic)
3. Filoplume feathersHair-like/no known function
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•Feathers are covered in oil to keep them water proof - "like water off a duck's back" - this oil is secreted from a preen gland
•Preening is a behavior that replaces the oil on feathers, and repairs broken links on the vanes
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Feather Types
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Feather Structure
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Endothermy
Generate and regulate body heat internallyEnables birds to inhabit both cold and hot climateBody temperature ranges from 40- 46 degrees Celsius. To help conserve body heat, birds fluff out their feathers to insulation.
copyright cmassengale
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Nervous System - response
Well develop sense organsA large brainCerebrum = thinking, decision making Cerebellum = coordinated movementMedulla oblongata = basic body process Optic lobes = visionOlfactory lobes = taste and smell
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Respiration
Highly advanced respirationPosterior and anterior air sacs with tube in between
Continuous one way flow
2 functions of the lungsOxygenate tissueCooling (no sweat glands)
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Nutrition
CarnivoresThere is a bird to hunt nearly every insect
OmnivoresNectar feedersHave specially developed beaks to accomplish feeding taskBirds can eat up to 100% of their weight in food every day
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Digestion
No teeth/poorly developed salivary glands
Grinding occurs in the gizzardPebbles are swallowed by the bird to help the gizzard grind the food
Pharynx—Esophagus—Crop—Stomach—Gizzard—Intestines—Ceca(in herbivores only, ferments)—Rectum—Cloaca
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Excretion
Paired metanephridic kidneysUrine is formed by filtration
Uric acid is formedAdvanced animals, because it has low solubility it can be excreted with little water loss
Salt glands aid in removing salt
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Territoriality and CourtshipDuring the breeding season many male birds establish an area that they defend against other males of their species, a behavior called territoriality.The male then attempts to attract a female to share this territory.Once a territory is established most birds engage in a period of courtship, behavior that is designed to attract a mate.Many males attract females by means of their brightly colored feathers.Some males combine song with flight displays.
copyright cmassengale
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ReproductionSexual reproduction
flamboyant coloration to attract mate
Monogamy is general rule in AvesSeasonalLifetime—swans, geese
Internal fertilizationBirds lack a penis, so cloaca must meetOviparous
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Why Monogamy?
Provide food, it must be gatheredNeed for a nest
Eggs must be incubatedMales are chosen because they have secured a territory
Announced through song
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Development
Direct developmentEggJuvenile—must be cared for Adult
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Many baby birds are born helpless and without feathers. These baby birds require lots of care from their parents.
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Some babies hatch with feathers and can follow their mom around, swim and eat on their own.
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Movement•Flightless (ostrich, penguin…etc)
•Forelimbs modified for flight = wings
•Collarbones are fused making a strong base for flight muscles - fused bone is the furculum
•Air spaces make the bones light in weight
•Strong chest muscle attach to a keel of the sternum (breastbone)
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What allows flight?
FeathersAir cavities in bones decrease densityBeaks rather then heavy jawsExtremely high metabolic rateLarge hearts and high-pressure circulationKeen visionExcellent neuromuscular coordination
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Environmental Interaction
Occupy almost any habitat on earth9,000 species
Largest group of vertebrates except fishes
Almost half the species migratePredators, prey, scavengers,herbivores, omnivores
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MigrationWhy migrate
Increases food availabilityBreedingAvoid predatorsReduce interspecies competition
Northern hemisphereBreedingsummers
Southern hemispherewinters
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MigrationHow do birds migrate?
Many follow landmarks such as rivers, coastlines.It is thought that they may also use the earths magnetic fieldThe sun and the stars are also used as compass directors
Some can travel as far as 11,200 milesStimulus for migration
Long days stimulate gonads to grow, fat deposits to increase and the urge to migrate north.
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