Evolutionary Rates in the Haptophyta : Exploring Molecular and Phenotypic Diversity
Henderiks, Jorijntje (Uppsala University)
Sturm, Daniela (University of Southampton)
Šupraha, Luka (University of Oslo)
Langer, Gerald (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)

Data:	2022
Resum:	Haptophytes are photosynthetic protists found in both freshwater and marine environ-ments with an origin possibly dating back to the Neoproterozoic era. The most recent molecular phylogeny reveals several haptophyte "mystery clades" that await morphological verification, but it is otherwise highly consistent with morphology-based phylogenies, including that of the cocco-lithophores (calcifying haptophytes). The fossil coccolith record offers unique insights into extinct lineages, including the adaptive radiations that produced extant descendant species. By combining molecular data of extant coccolithophores and phenotype-based studies of their ancestral lineages, it has become possible to probe the modes and rates of speciation in more detail, although this approach is still limited to only few taxa because of the lack of whole-genome datasets. The evolution of calcification likely involved several steps, but its origin can be traced back to an early association with organic scales typical for all haptophytes. Other key haptophyte traits, including the haplo-diplontic life cycle, are herein mapped upon the coccolithophorid phylogeny to help navigate a discussion of their ecological benefits and trade-offs in a rapidly changing ocean.
Nota:	Unidad de excelencia María de Maeztu CEX2019-000940-M
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article de revisió ; recerca ; Versió publicada
Matèria:	Adaptive evolution ; Coccolithophores ; Coccoliths ; Functional traits ; Haplo-diplontic life cycle ; Haptophytes ; Marine fossil record ; Molecular phylogeny ; Phytoplankton
Publicat a:	Journal of marine science and engineering, Vol. 10, Issue 6 (February 2022) , art. 798, ISSN 2077-1312

DOI: 10.3390/jmse10060798

29 p, 8.5 MB

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