BIOL 1070 Lecture Notes - Lecture 3: Zebra Mussel, Glochidium, Veliger
4 Nov 2018
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Unionid larvae: glochidia: cannot swim/crawl (beneficial because fresh supply of water, attach to host fish gills. Conglutinates: glochidia enclosed in membranous capsules that mimic host prey (larval fish/insect, parasitic larvae called glochidia, when broken up they release glochidia. Unionid strategies: sacs of glochidia that mimic prey (so fish try to eat it, host capture (grab fish by face) and pumps glochidia over gills, modified mantle tissue catches fish attention to attract host. Complex lures: modified mantle tissue mimics fish or invertebrate prey item to attract fish host, marsupial contains all of the glochidia. Zebra mussel life cycle- veliger larvae: thistlethreads to attach to substrate surface (hard, release gametes into water and fertilization takes place externally, unionid: grows in gills. Makes a foot, starts metamorphosis: native mussels bury themselves in the substrate. Genetic variation: differences at the dna level among individuals within a population or species. Mutations do not occur in order to benefit the organism.
