Oceanographic processes shape genetic signatures of planktonic cephalopod paralarvae in two upwelling regions

Roura, Alvaro, Amor, Michael, Gonzalez, Angel F., Guerra, Angel, Barton, Eric D., and Strugnell, Jan M. (2019) Oceanographic processes shape genetic signatures of planktonic cephalopod paralarvae in two upwelling regions. Progress in Oceanography, 170. pp. 11-27.

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Abstract

The planktonic paralarval stage of cephalopods (octopus, squids and cuttlefishes) is an important dispersal phase, particularly of benthic species, that lasts from days to months. Cephalopod paralarvae modify their vertical position in the water in upwelling ecosystems and such behaviour influences their spatial distribution and genetic structure, but to what extent? In this work specific water masses were sampled with Lagrangian buoys in two contrasting upwelling systems (Iberian Peninsula and Morocco) of the Iberian-Canary current eastern boundary upwelling (ICC) in order to: (i) identify the cephalopod assemblage in the different upwelling systems (ii) define their planktonic dispersal patterns and (iii) analyse the effect of different dispersal patterns on genetic structure and connectivity. Cephalopod paralarvae were identified using the cytochrome c oxidase subunit I gene (COI), revealing 21 different species and F-st values showed no population structure between both upwelling systems. Cephalopod species richness was two times higher in the Moroccan upwelling than in the Iberian Peninsula, with an undescribed Ancistrocheiridae species identified in Moroccan waters. Three common planktonic dispersal patterns were identified in the ICC: coastal, coastal-oceanic and oceanic. Coastal and oceanic dispersal patterns favoured spatio-temporal paralarval retention or "schooling" of different cohorts over the continental shelf and continental slope in 9 and 11 species, respectively. Such spatio-temporal retention was reflected in the complex haplotype networks and high nucleotide/haplotype diversity recorded for these two groups. The only cephalopod species displaying a coastal-oceanic dispersal pattern was Octopus vulgaris, where low nucleotide and haplotype diversity was observed. The observed decline in genetic structure resulted from the dispersal of similar cohorts within upwelling currents and upwelling filaments to the oceanic realm. Seascape analysis revealed that cephalopod paralarvae from two coastal upwelling ecosystems of the ICC display three planktonic dispersal patterns with contrasting distributions and signatures at the genetic level.

Item ID: 57043
Item Type: Article (Research - C1)
ISSN: 1873-4472
Keywords: Upwelling filaments, Cephalopod paralarvae, Seascape genetics, Eastern boundary upwelling system, Planktonic dispersal patterns, Octopus vulgaris, Northeastern Atlantic
Copyright Information: © 2018 Elsevier Ltd. All rights reserved
Funders: Spanish Ministry of Innovation and Science (SMIS), Fundación Barrié (FB), La Trobe University (LTU)
Projects and Grants: SIMS CTM2007-66408-C02, FB 3003197/2013, LTU Securing Food, Water and the Environment Research Focus Area grant
Date Deposited: 06 Feb 2019 07:53
FoR Codes: 06 BIOLOGICAL SCIENCES > 0604 Genetics > 060408 Genomics @ 35%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 30%
06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060399 Evolutionary Biology not elsewhere classified @ 35%
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