BIOL359 Lecture Notes - Lecture 12: Species Complex, Assortative Mating, Hyalella
1 Nov 2017
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Document Summary
Biology 359 lec 12 species concept and speciation. Cryptic species the ones that cannot be distinguished based on the morphological features. Phenotypic plasticity variation without genetic difference. env induced difference. Asexual taxa organisms that do not reproduce sexually. Typological/morphological if specimens agree in terms of morphology. Biological groups of populations that are reproductively isolated from the rest. Phylogenetic examining the evolutionary fate through dna. Examples: pseudo-nitzschia (algae) thought to have been 2 species based on light microscopy. Studies revealed 8, combining the species concepts: european skate thought to be 2 species, then changed to 1. Studies revealed 2, that aren"t even closely related. Using this method, morphological differences were identi ed, such as differing tooth size: cryptic hyalella azteca (zooplankton). Many morph. similar species, but different in other aspects: the monkey ower two isolated types: coastal and inland. morph. differ in the amount of energy spent on owers. studies shown that these differences are adaptations (nat. selection).
