PPT-Discussion of Sequential Sympatric Speciation

Across Trophic Levels by Andrew A Forbes Thomas HQ Powell Lukasz L Stelinski James J Smith and Jeffrey L Feder Department of Biological Sciences University of Notre Dame Department of Entomology and Nematology University of Florida. The Origin of Species. Overview: That “Mystery of Mysteries”. In the Galápagos Islands Darwin discovered plants and animals found nowhere else on Earth. Video: Galápagos Tortoise. Fig. 24-1. Speciation. The . formation of a new . species. 15.3 Speciation. What is a species?. A group of organisms with similar characteristics capable of producing fertile . offspring. Members of a . species. . share. the . What is a Species?. Speciation. – the origin of new species. The . biological species concept. defines a species as a population or group of populations whose members have the potential to interbreed with one another in nature to produce viable, fertile offspring, but who cannot produce viable, fertile offspring with members of other species. Evolution. Results of evolution. New species (speciation). Causes of evolution. Barriers between same species (gene pools). Geographical isolation -> leads to . allopatric. speciation. Temporal isolation -> leads to sympatric speciation. EVOLUTION #1 (Group 3). Strawberry Frogs Forever. Participants: Lin Xiang. Ingo . Schlupp. Tiffany Roberts. Anne . Grippo. Jerry Farris. Facilitators: Brooke . Brian O. ’. Meara. EEB464 Fall . 2015. http://www.youtube.com/watch?v=lopTMhAbXoI. Initiation of speciation. Maintenance of current species. Prezygotic. Postzygotic. Zygote image © Laboratoire de Biologie de la Reproduction; Lausanne, image downloaded from . . Allopatric Speciation Sympatric Speciation Adaptive Radiation. Objectives. To define speciation. To explore the different types of speciation. To examine real life examples of different types of speciation. Species. == “kind” or “type” in Latin. Typological . (morphological) species. . == a group of organisms that share certain characteristics which are different than other groups—usually differences in anatomy. . Part C. Allopatric. and Sympatric Speciation: . A Review. In . allopatric. speciation, geographic isolation restricts gene flow between populations. Reproductive isolation may then arise by natural selection, genetic drift, or sexual selection in the isolated populations. Cartoon – gentleman and ape. 2. Key Concepts:. Species concepts. Development of reproductive isolation. Patterns of speciation. Macroevolution. Human evolution. Evolution continues…... 3. specie. Species. Part B. How do species occur?. Concept . 24.2: Speciation can take place with or without geographic separation. Speciation can occur in two ways:. Allopatric. speciation. Sympatric . speciation. Populations must become isolated. Reproductive isolation is key!. Once isolated, populations will evolve independently (different factors affecting each). Two types of speciation. allopatric. geographic separation. Science. Lesson 8: challenge answer. Investigate and make note of other species that have evolved due to parapatric speciation. . Typically seen in species of fish.. Learning intention. To know what sympatric speciation is and how it occurs. . After reading this module you should be able to. Explain . the processes of allopatric and sympatric speciation.. U. nderstand . the factors that affect the pace of . evolution.. Speciation can be allopatric or sympatric.