From seascape ecology to population genomics and back. Spatial and ecological differentiation among cryptic species of the red algae Lithophyllum stictiforme/L. cabiochiae, main bioconstructors of coralligenous habitats

Type Article
Date 2019-08
Language English
Author(s) De Jode Aurélien1, David Romain1, Haguenauer Anne1, 2, Cahill Abigail E.1, 3, Erga Zinovia1, Guillemain Dorian1, 4, Sartoretto StephaneORCID5, Rocher Caroline1, Selva Marjorie1, Le Gall Line6, Féral Jean-Pierre1, Chenuil Anne1
Affiliation(s) 1 : Aix Marseille Univ, Univ Avignon, CNRS, IRD, IMBE, Marseille, France
2 : EPHE PSL Research University, USR 3278 CRIOBE CNRS-UPVD, BP 1013, Moorea, 98729, French Polynesia
3 : Biology Department, Albion College, Michigan 49224, USA
4 : Institut Pythéas: Observatoire des Sciences de l'Univers
5 : IFREMER, Zone Portuaire de Brégaillon, 83500 La Seyne-sur-mer, France
6 : Institut Systématique Evolution Biodiversité (ISYEB), Muséum national d’Histoire naturelle, CNRS, Sorbonne Université, EPHE, 57 rue Cuvier, CP 39, 75005 Paris, France
Source Molecular Phylogenetics And Evolution (1055-7903) (Elsevier BV), 2019-08 , Vol. 137 , P. 104-113
DOI 10.1016/j.ympev.2019.04.005
WOS© Times Cited 7
Keyword(s) Engineering species, Cryptic species, Ecological niche, Coralligenous habitats, Ecological differentiation, Crustose Coralline Algae
Abstract

Ecosystem engineering species alter the physical structure of their environment and can create or modify habitats, having a massive impact on local biodiversity. Coralligenous reefs are highly diverse habitats endemic to the Mediterranean Sea built by calcareous benthic organisms among which Crustose Coralline Algae are the main engineering species. We analyzed the diversity of Lithophyllum stictiforme or L. cabiochiae in coralligenous habitats combining a multiple barcode and a population genomics approach with seascape features. Population genomics allowed disentangling pure spatial effects from environmental effects. We found that these taxa form a complex of eight highly divergent cryptic species that are easily identifiable using classic barcode markers (psbA, LSU, COI). Three factors have a significant effect on the relative abundances of these cryptic species: the location along the French Mediterranean coast, depth and Photosynthetic Active Radiation (PAR). The analysis of around 5000 SNPs for the most abundant species revealed genetic differentiation among localities in the Bay of Marseille but no differentiation between depths within locality. Thus, the effect of depth and PAR on cryptic species communities is not a consequence of restricted connectivity but rather due to differential settlement or survival among cryptic species. This differential is more likely driven by irradiance levels rather than by pressure or temperature. Both the genetic and species diversity patterns are congruent with the main patterns of currents in the Bay. Ecological differentiation among these engineering cryptic species, sensitive to ocean warming and acidification, could have important consequences on the diversity and structure of the coralligenous communities.

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De Jode Aurélien, David Romain, Haguenauer Anne, Cahill Abigail E., Erga Zinovia, Guillemain Dorian, Sartoretto Stephane, Rocher Caroline, Selva Marjorie, Le Gall Line, Féral Jean-Pierre, Chenuil Anne (2019). From seascape ecology to population genomics and back. Spatial and ecological differentiation among cryptic species of the red algae Lithophyllum stictiforme/L. cabiochiae, main bioconstructors of coralligenous habitats. Molecular Phylogenetics And Evolution, 137, 104-113. Publisher's official version : https://doi.org/10.1016/j.ympev.2019.04.005 , Open Access version : https://archimer.ifremer.fr/doc/00487/59859/