Phylogenetic diversity in freshwater-dwelling Isochrysidales haptophytes with implications for alkenone production.

ABSTRACT: Members of the order Isochrysidales are unique among haptophyte lineages in being the exclusive producers of alkenones, long-chain ketones that are commonly used for paleotemperature reconstructions. Alkenone-producing haptophytes are divided into three major groups based largely on molecular ecological data: Group I is found in freshwater lakes, Group II commonly occurs in brackish and coastal marine environments, and Group III consists of open ocean species. Each group has distinct alkenone distributions; however, only Groups II and III Isochrysidales currently have cultured representatives. The uncultured Group I Isochrysidales are distinguished geochemically by the presence of tri-unsaturated alkenone isomers (C_37:3b Me, C_38:3b Et, C_38:3b Me, C_39:3

SUBMITTER: Richter N 

PROVIDER: S-EPMC6590312 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature