Convergent Evolution
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<fishfyi-glossary slug="convergent-evolution"></fishfyi-glossary>定義
The independent evolution of similar traits in unrelated fish lineages, such as the torpedo body shape shared by tuna, mackerel sharks, and ichthyosaurs.
詳細説明
Convergence in fish is rampant because a limited number of ecological problems (sustained pelagic cruising, benthic camouflage, ambush predation, filter feeding) each have optimal morphological solutions that unrelated lineages evolve independently. Independently evolved torpedo bodies occur in tuna (Scombridae), bonito (Katsuwonidae), wahoo (Scombridae), and several shark lineages. Independently evolved flatfish body plans evolved in at least three separate teleost lineages. Bioluminescence has evolved independently over 25 times in marine fish alone. Genome sequencing now allows researchers to determine whether convergent phenotypes are produced by identical genetic changes (molecular convergence) or different genetic routes to the same morphological solution.