Genetic diversity, gene flow and hybridization in fan-shaped sponges (Phakellia spp.) in the North-East Atlantic deep sea



Downloads per month over past year

Taboada, Sergi and Ríos, Pilar and Mitchell, Alex and Cranston, Alex and Busch, Kathrin and Tonzo, Vanina and Cárdenas, Paco and Sánchez, Francisco and Leiva, Carlos and Koutsouveli, Vasiliki and Cristobo, Javier and Xavier, Joana R. and Hentschel, Ute and Rapp, Hans-Tore and Morrow, Christine and Drewery, Jim and Romero, Pedro E. and Arias, Maria Belén and Whiting, Connie and Riesgo, Ana (2022) Genetic diversity, gene flow and hybridization in fan-shaped sponges (Phakellia spp.) in the North-East Atlantic deep sea. Deep Sea Research Part I: Oceanographic Research Papers, 181 (103685). pp. 1-19. ISSN 0967-0637

[thumbnail of Taboada-DBEE-Genetic-diversity.pdf]
Creative Commons Attribution Non-commercial No Derivatives.


Official URL:


Deep-sea North Atlantic sponge grounds are crucial components of the marine fauna providing a key role in ecosystem functioning. To properly develop effective conservation and management plans, it is crucial to understand the genetic diversity, molecular connectivity patterns and turnover at the population level of the species involved. Here we present the study of two congeneric sponges, Phakellia robusta and Phakellia hirondellei, using multiple sources of evidence. Our phylogenetic study using a fragment of COI placed these two species as sister. Haplotype network analysis using COI revealed no genetic structure for P. hirondellei in samples from the Cantabrian Sea (<100 km). Contrastingly, P. robusta showed a clear genetic structure separating deep-water samples from the Cantabrian Sea and the Hatton-Rockall Basin, from samples from shallower waters from Kerry Head Reefs, NW of Orkney, and Norway. ddRADseq-derived SNPs for P. robusta also segregated samples by bathymetry rather than by geographical distances, and detected a predominant northwards migration for shallow-water specimens connecting sites separated ca. 2,000 km, probably thanks to prevalent oceanographic currents. Importantly, our analysis using SNPs combining the datasets of the two species revealed the presence of potential hybrids, which was corroborated by morphological (spicule) and microbial (16S amplicon sequencing) analyses. Our data suggest that hybridization between these two species occurred at least two times in the past. We discuss the importance of using next-generation techniques to unveil hybridization and the implications of our results for conservation.

Item Type:Article
Additional Information:

CRUE-CSIC (Acuerdos Transformativos 2022)

Uncontrolled Keywords:Introgression; SNPs; COI; Microbial community analysis; Conservation; MPA
Subjects:Medical sciences > Biology > Invertebrates
ID Code:72492
Deposited On:25 May 2022 13:00
Last Modified:06 Jun 2022 14:47

Origin of downloads

Repository Staff Only: item control page