Latitudinal influences on bryozoan calcification through the Paleozoic

Catherine Reid, Patrick N Wyse Jackson &
Bryozoans are active non-phototrophic biomineralizers that precipitate their calcareous skeletons in sea-water. Carbonate saturation states vary temporally and spatially in Paleozoic oceans, and we used the Bryozoan Skeletal Index (BSI) to investigate whether bryozoan calcification is controlled by seawater chemistry in Paleozoic trepostome and cryptostome bryozoans. Our results show that cryptostome bryozoan genera are influenced by ocean chemistry throughout the Paleozoic and precipitate the most calcite per autozooid at lower latitudes, where carbonate saturation states...
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