Phylogeography of the deep-sea morid codling Lepidion lepidion reveals the presence of two ancient atlantic/mediterranean lineages.
-
1
Interdisciplinary Center for Marine and Environmental Research, Abel Salazar Institute of Biomedical Sciences, University of Porto, Portugal
-
2
Other, Spain
-
3
Grupo de Estudo do Medio Mariño (GEMM), Spain
-
4
Oceanographic Center of Cádiz, Spanish Institute of Oceanography, Spain
-
5
Facultad de Biología, Universidad de Vigo, Spain
Historically, deep-sea habitats have been considered highly homogeneous, leading to the generalised idea that the species inhabiting them have enormous distribution ranges with little or no opportunity for speciation processes. This idea has remained unchanged until recent times because these environments have remained practically unknown, mostly due to budget constraints and technological infrastructures required to obtain good sample coverage. Nowadays, it is known that the seabed has a varied relief, with different seascapes and variable orography, which could set the conditions for a higher production leading to an increased biodiversity. This is the case of specific highly productive habitats such as seamounts or submarine canyons that work as isolated islands of endemism or even like stepping stones for dispersion depending on the oceanographic conditions and the biology of the species under study. In the present investigation, different questions regarding the genetic diversity of deep-sea morid cod Lepidion lepidion have been answered. In order to achieve that, four different habitats throughout its distribution area have been sampled: three in the north-eastern Atlantic Ocean (Aviles Canyon, Galicia Bank and Porcupine Seabight) and one in the western Mediterranean Sea (Balearic Basin) (Fig. 1).
Figure 1: Sampled sites of L. lepidion (AC: Aviles Canyon; BB; Balearic Basin; GB: Galicia Bank; PS: Porcupine Seabight)
Genetic analyses were carried out using three mitochondrial (COI; 16S; NAD2) and two nuclear (RAG1; ZIC1) markers. Neutrality tests and mismatch distributions indicated past events of demographic expansion in the western Mediterranean Sea and the north-eastern Atlantic Ocean. However, north-western of the Iberian Peninsula (Aviles Canyon and Galicia Bank) showed higher values of genetic diversity and typical features of long term stable populations. Discriminant Analysis of Principal Components (DAPC) indicated the presence of two different and partially mixed nuclear lineages, suggesting isolation followed by secondary contact between individuals from the Atlantic Ocean and the Mediterranean Sea (Fig. 2).
Figure 2: Lineage membership probability for each individual of L. lepidion (AC: Aviles Canyon; BB; Balearic Basin; GB: Galicia Bank; PS: Porcupine Seabight).
In general, no genetic structure was found, with only moderate differentiation in Aviles Canyon (NW Iberian Peninsula). This could be explained by the asymmetric migration occurring in this specific location, perhaps due to the prevailing oceanographic conditions in the area. The Galicia Bank seamount seems to play a key role in the connectivity between the Mediterranean Sea and the north-eastern Atlantic Ocean. Finally, the results suggest the genetic connectivity of L. lepidion likely to be due to the pelagic stages, and ultimately to the variations of the oceanographic conditions over time.
Keywords:
DNA,
mtDNA,
Seamount,
Submarine canyon,
demographic history
Conference:
XX Iberian Symposium on Marine Biology Studies (SIEBM XX) , Braga, Portugal, 9 Sep - 12 Sep, 2019.
Presentation Type:
Oral Presentation
Topic:
Ecology, Biodiversity and Vulnerable Ecosystems
Citation:
Barros-García
D,
Froufe
E,
Bañón
R,
Arronte
JC,
Baldó
F and
De Carlos
A
(2019). Phylogeography of the deep-sea morid codling Lepidion lepidion reveals the presence of two ancient atlantic/mediterranean lineages..
Front. Mar. Sci.
Conference Abstract:
XX Iberian Symposium on Marine Biology Studies (SIEBM XX) .
doi: 10.3389/conf.fmars.2019.08.00129
Copyright:
The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers.
They are made available through the Frontiers publishing platform as a service to conference organizers and presenters.
The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated.
Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed.
For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions.
Received:
17 May 2019;
Published Online:
27 Sep 2019.
*
Correspondence:
Dr. David Barros-García, Interdisciplinary Center for Marine and Environmental Research, Abel Salazar Institute of Biomedical Sciences, University of Porto, Matosinhos, Portugal, davbarros1985@gmail.com