The Origin of Species

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1 The Origin of Species Introduction A species can be defined as a group of organisms whose members can breed and produce fertile offspring, but who do not produce fertile offspring with members of other groups Chapter The origin of species is the source of biological diversity Speciation is the emergence of new species The many millions of species on Earth have all arisen from an ancestral life form that lived around 3.6 billion years ago

2 CONCEPTS OF SPECIES Taxonomy is the branch of biology that names and classifies species and groups them into broader categories Carolus Linnaeus developed the binomial system of naming organisms using physical characteristics to distinguish over 11,000 species Similarities between some species and variation within species can make defining species difficult The biological species concept defines a species as a population or group of populations whose members have the potential to interbreed in nature and produce fertile offspring Can the biological species concept always distinguish species from each other? Reproductive isolation prevents gene flow and maintains separate species

3 The morphological species concept classifies organisms based on observable phenotypic traits It can be applied to asexual organisms, fossils, and in cases when we don t know about possible interbreeding The ecological species concept defines a species by its ecological role or niche Consider the cichlids, which are similar in appearance but feed at different depths in the lake There is some subjectivity in deciding which traits to use 14.3 Reproductive barriers keep species separate The phylogenetic species concept defines a species as a set of organisms representing a specific evolutionary lineage Morphological or DNA similarities or differences can be used to define a species Defining the amount of difference required to distinguish separate species is a problem Reproductive barriers serve to isolate a species gene pool and prevent interbreeding Reproductive barriers are categorized as prezygotic or postzygotic, depending on whether they function before or after zygotes form

4 Gametes Prezygotic barriers Temporal isolation Habitat isolation Behavioral isolation Mechanical isolation Gametic isolation Zygote Postzygotic barriers Reduced hybrid viability Reduced hybrid fertility Hybrid breakdown Viable, fertile offspring MECHANISMS OF SPECIATION 14.4 In allopatric speciation, geographic isolation leads to speciation In allopatric speciation, populations of the same species are geographically separated, separating their gene pools Changes in the allele frequencies of each population may be caused by natural selection, genetic drift, and mutation

5 14.4 In allopatric speciation, geographic isolation leads to speciation Gene flow between populations is initially prevented by a geographic barrier The Grand Canyon and Colorado River separate two species of antelope squirrels 14.4 In allopatric speciation, geographic isolation leads to speciation Likelihood of allopatric speciation increases when a population is small and isolated A small population may have a different gene pool due to the founder effect Genetic drift and natural selection may have a greater effect in a small population in a new habitat 14.5 In sympatric speciation, speciation takes In sympatric speciation, new species may arise within the same geographic area as the parent species Gene flow between populations may be reduced by factors such as polyploidy, habitat differentiation, or sexual selection 14.5 In sympatric speciation, speciation takes Many plant species have evolved by polyploidy, the multiplication of the chromosome number due to errors in cell division A tetraploid (4n) plant can arise from a diploid parent

6 14.5 In sympatric speciation, speciation takes Most polyploids arise from hybridization of two different species Chromosomes not homologous (cannot pair) 1 2 Haploid gametes from two different species combine to produce a sterile hybrid Species A 2n = 4 Gamete n = 2 3 Chromosome duplications may produce a fertile polyploid species Species B 2n = 6 Gamete n = 3 Sterile hybrid n = 5 Viable, fertile hybrid species 2n = In sympatric speciation, speciation takes Sympatric speciation in animals more commonly occurs through habitat differentiation and sexual selection 14.6 EVOLUTION CONNECTION: Most plant species trace their origin to polyploid speciation 80% of all living plant species are the descendants of ancestors that formed by polyploid speciation Hybridization between two species accounts for most of these species What advantage might there be to hybridization? Polyploid food plants include oats, potatoes, bananas, peanuts, barley, plums, apples, sugarcane, coffee, and bread wheat Cotton is also polyploid

7 14.6 EVOLUTION CONNECTION: Most plant species trace their origin to polyploid speciation Wheat has been domesticated for 11,000 years It is the most widely cultivated plant in the world Bread wheat, Triticum aestivum, is a polyploid with 42 chromosomes Triticum monococcum AA BB AA T. turgidum Emmer wheat (28 chromosomes) 2 " AB 1 BB Hybridization Sterile hybrid Cell division error and self-fertilization " 3 DD Hybridization Wild Triticum T. tauschii (wild) ABD Sterile hybrid (21 chromosomes) 4 Cell division error and self-fertilization AA BB DD T. aestivum Bread wheat (42 chromosomes) Adaptive radiation may occur when new opportunities arise In adaptive radiation, many diverse species evolve from a common ancestor Adaptive radiations occur When a few organisms colonize new unexploited areas After a mass extinction Adaptive radiations are linked to new opportunities: lack of competitors, varying habitats and food sources, evolution of new structures Speciation may occur rapidly or slowly What is the total length of time between speciation events (between formation of a species and subsequent divergence of that species)? In a survey of 84 groups of plants and animals, the time ranged from 4,000 to 40 million years Overall, the time between speciation events averaged 6.5 million years and rarely took less than 50,000 years Animation: Macroevolution

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