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What kind of speciation do we normally associate with members from one population being geographically displaced to a new, smaller population? Geospiza scandens B. What kind of speciation do we normally associate with members of a population that become ecologically, genetically or behaviorally distinct within that population such that they become reproductively isolated?

What kind of speciation do we normally associate with members from one population being geographically displaced to a new, smaller population? Geospiza scandens B. What kind of speciation do we normally associate with members of a population that become ecologically, genetically or behaviorally distinct within that population such that they become reproductively isolated?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
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ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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A. What kind of speciation do we normally associate with members from one population being geographically displaced to a new, smaller population? Geospiza scandens B. What kind of speciation do we normally associate with members of a population that become ecologically, genetically or behaviorally distinct within that population such that they become reproductively isolated? 
Tale of Speciation on Daphne Major "Speciation, the process by which two species form from one, involves the development of reproductive isolation of two divergent lineages."" 11 https://www.youtube.com/watch?v=MCM23M-CCog&t=17s This is an interesting tale of a small population, an immigrant, incest, and isolation. Good thing these are birds. In 1981 a population of finches of the species Geospiza fortis lived on the Galapagos island of Daphne Major. An immigrant landed on the island. It was a hybrid of two finch species from another island. It's genetic make up was 66% Geospiza fortis and 34% Geospiza scandens (another common Galapagos finch species). It came from an unknown island, was unusually large, had a huge beak, and sang a strange song. Over four generations this hybrid bred with other G. fortis finches on the island until a drought occurred, wiping out all but one brother and sister. The brother and sister had no choice but to breed with each other (scandal!). Their offspring were different from either of them or other finches on the island. The male's song was strange because in learning the song from the father, it was copied incorrectly. But, females of this new population understood the song even though it was wrong. Members of the greater G. fortis population ignored the incorrect song and would not mate with the males who sang it. A barrier was in place that originally resulted from one immigrant being separated from its own population somewhere else, and its lineage ended up being behaviorally isolated by an incorrect learned behavior.
Transcribed Image Text:Tale of Speciation on Daphne Major "Speciation, the process by which two species form from one, involves the development of reproductive isolation of two divergent lineages."" 11 https://www.youtube.com/watch?v=MCM23M-CCog&t=17s This is an interesting tale of a small population, an immigrant, incest, and isolation. Good thing these are birds. In 1981 a population of finches of the species Geospiza fortis lived on the Galapagos island of Daphne Major. An immigrant landed on the island. It was a hybrid of two finch species from another island. It's genetic make up was 66% Geospiza fortis and 34% Geospiza scandens (another common Galapagos finch species). It came from an unknown island, was unusually large, had a huge beak, and sang a strange song. Over four generations this hybrid bred with other G. fortis finches on the island until a drought occurred, wiping out all but one brother and sister. The brother and sister had no choice but to breed with each other (scandal!). Their offspring were different from either of them or other finches on the island. The male's song was strange because in learning the song from the father, it was copied incorrectly. But, females of this new population understood the song even though it was wrong. Members of the greater G. fortis population ignored the incorrect song and would not mate with the males who sang it. A barrier was in place that originally resulted from one immigrant being separated from its own population somewhere else, and its lineage ended up being behaviorally isolated by an incorrect learned behavior.
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