Main Points. 2) The Great American Interchange -- dispersal versus vicariance -- example: recent range expansion of nine-banded armadillos
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1 Main Points 1) Mammalian Characteristics: Diversity, Phylogeny, and Systematics: -- Infraclass Eutheria -- Orders Scandentia through Cetacea 2) The Great American Interchange -- dispersal versus vicariance -- example: recent range expansion of nine-banded armadillos 3) Evolution of body size on islands -- the island rule -- example: sloth evolution in the Caribbean 4) Terms: arboreal, saltatorial, myrmecophagy, folivory, dispersal, vicariance, island rule, cursorial, ruminant, cecum, Cetartiodactyla Pre-reading: Wednesday 16 Sep = Sykes et al 2014, MacLeod 2014 Monday 21 Sep = Nagasawa et al
2 Subclass Theria, Infraclass Eutheria 2
3 Order Scandentia: tree shrews Taxonomy: 1 family, 19 species Distribution: Oriental Characteristics: -- arboreal -- highest brain:body mass of any group of mammals large tree shrew 3
4 Order Lagomorpha: hares, rabbits, pikas Taxonomy: 2 families, 80 species Distribution: cosmopolitan, except Australasia Characteristics: -- incisors grow continuously -- saltatorial with hind limbs longer than forelimbs black-tailed jackrabbit mountain cottontail American pika 4
5 Order Rodentia: rodents Taxonomy: 29 families, 2024 species Distribution: cosmopolitan Characteristics: -- incisors grow continuously throughout life -- skull and jaw musculature adapted for gnawing naked mole rat capybara Lord Derby s anomalure 5
6 Order Cingulata: armadillos Taxonomy: 1 family, 21 species Distribution: Neotropical, 1 species Nearctic Characteristics: -- bony plates on head and body -- myrmecophagous fairy armadillo screaming hairy armadillo giant armadillo 6
7 The Great American Interchange Joining of Nearctic and Neotropical zoogeographic regions roughly 3 MYA -- many Nearctic taxa migrated southward; few Neotropical taxa migrated northward -- mass extinctions of Neotropical metatherians 7
8 Recent range expansion by the nine-banded armadillo 1972 Northward expansion of 10 km/year since 1940s 1994 nine-banded armadillo Taulman and Robbins
9 Recent range expansion by the nine-banded armadillo 1972 Northward expansion of 10 km/year since 1940s Ultimately might be limited by rainfall (to the west) and temperature (to the north) 1994 Red = 2009 distribution Pink = predicted future distribution Taulman and Robbins
10 Historical Biogeography Dispersal vs. Vicariance Dispersal (biogeographic context) = migration across preexisting geographic barriers 10
11 Historical Biogeography Dispersal vs. Vicariance Dispersal (biogeographic context) = migration across preexisting geographic barriers 11
12 Historical Biogeography Dispersal vs. Vicariance Vicariance = formation of geographic barriers across preexisting geographic ranges 12
13 Historical Biogeography Dispersal vs. Vicariance Vicariance = formation of geographic barriers across preexisting geographic ranges 13
14 Order Pilosa: true anteaters and sloths Taxonomy: 4 families, 10 species Distribution: Neotropical silky anteater two-toed sloth giant anteater 14
15 Order Pilosa: true anteaters and sloths Characteristics: -- incomplete zygomatic arches -- no enamel on cheek teeth -- myrmecophagous (anteaters) or folivorous (sloths) silky anteater two-toed sloth giant anteater 15
16 Evolution of Gigantism and Dwarfism -- island rule = on islands, the tendency for small species to increase in size (gigantism), and large species to decrease in size (dwarfism), over evolutionary time scales brown-throated sloth (~7 kg) pygmy sloth (~3 kg) 16
17 Evolution of Gigantism and Dwarfism brown-throated sloth (~7 kg) pygmy sloth (~3 kg) 17
18 Discussion question: come up with a hypothesis for the island rule. What does your hypothesis predict? brown-throated sloth (~7 kg) pygmy sloth (~3 kg) 18
19 Evolution of Gigantism and Dwarfism Anderson and Handley
20 Evolution of Gigantism and Dwarfism island wood mouse (35 g) wood mouse (15 g) 20
21 Order Artiodactyla: even-toed ungulates Taxonomy: 10 families, 220 species Distribution: cosmopolitan, excepting Australasia Characteristics: -- cursorial or aquatic -- weight borne on 3rd and 4th digit -- many with ruminant stomach or cecum musk deer river hippopotamus bighorn sheep bactrian camel 21
22 Discussion question: Wong describes the history of how artiodactyls (and hippos in particular) were discovered to be ancestral to whales. To you, what was the most convincing piece of evidence for this? 22
23 Discussion question: Wong describes the history of how artiodactyls (and hippos in particular) were discovered to be ancestral to whales. To you, what was the most convincing piece of evidence for this? fossil whale pronghorn fossil whale 23
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32 Cetartiodactyla 32
33 Order Cetacea: whales, dolphins, porpoises Taxonomy: 10 families, 78 species Distribution: Oceanic, rivers of Neotropical and Oriental Characteristics: -- fusiform body with modified forelimbs and vestigial hind limbs -- posterior migration of external nares 33
34 Suborder Odontoceti: toothed whales Taxonomy: 6 families, 67 species Distribution: Oceanic, rivers of Neotropical and Oriental regions Characteristics: -- single narial opening -- homodont dentition -- echolocation narwals orca and harbor porpoise baiji 34
35 Suborder Mysticeti: baleen whales Taxonomy: 4 families, 11 species Distribution: Oceanic (no rivers) Characteristics: -- two narial openings -- baleen blue whale bowhead whale 35
36 Suborder Mysticeti: baleen whales Characteristics: -- lunge feeding = feeding method in which whale accelerates toward food, expands mouth, gulps and then filters huge amounts of water and food. 36
37 Discovery of a New Organ (?!?) in a Vertebrate Pyenson et al
Main Points. 2) The Great American Interchange -- dispersal versus vicariance -- example: recent range expansion of nine-banded armadillos
Main Points 1) Diversity, Phylogeny, and Systematics -- Infraclass Eutheria -- Orders Scandentia through Cetacea 2) The Great American Interchange -- dispersal versus vicariance -- example: recent range
Main Points. 2) The Great American Interchange -- dispersal versus vicariance -- example: recent range expansion of nine-banded armadillos
Main Points 1) Diversity, Phylogeny, and Systematics -- Infraclass Metatheria continued -- Orders Diprotodontia and Peramelina -- Infraclass Eutheria -- Orders Lagomorpha through Cetacea 2) The Great American
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