LIFESCI 2 Lecture Notes - Lecture 12: Halimeda, Foraminifera, Symbiogenesis
Document Summary
Engulfed by a bigger cell so now it"s inside. How we get red & green algae. Organelle has 4 membranes: phylogeny of photosynthesis, euks acquired photosynthesis multiple times by repeated episodes of endosymbiosis, evidence: phylogenetic relationships based on chloroplast genes, archaeplastida: all are photoautotrophs (photosynthetic, all photoautotrophs have cholorphyll a, diversity of green algae. Calcium carbonate --> tropical sand (halimeda spp. ) Closest relatives of land plants: red algae. Coralline red algae have calcium carbonate in cell walls. Adaptation in red algae = additional pigments, absorb diff. Wavelengths of light, allows for use of different niches, & can grow in deeper water due to absorbing different wavelengths: stramenopiles: result of secondary endosymbiosis & includes brown algae, water molds, & diatoms: most of the largest algae on the planet are the browns (ex. > 10,000 known species freshwater & saltwater. Silica cell walls: hard parts leave a fossil record in sediments: water molds.
