DNA Barcoding at the Iberian Symposium on Marine Biology Studies

DNA Barcoding at the Iberian Symposium on Marine Biology Studies

DNA Barcoding at the Iberian Symposium on Marine Biology Studies

Marking its 20th anniversary, the international Iberian Symposium on Marine Biology Studies took in September 2019 in Braga, Portugal
Participants to the 20th International Iberian Symposium on Marine Biology Studies, 9-12 September 2019, Braga, Portugal PHOTO CREDIT: Andreia Pacheco
Marking its 20th anniversary, the international Iberian Symposium on Marine Biology Studies, organized by the University of Minho and the Centre of Molecular and Environmental Biology (CBMA) in Braga, Portugal, took place from September 9-12 this year. Of the 14 plenary sessions, one was dedicated to DNA barcoding and DNA metabarcoding. Plenary speaker and session chair, Mehrdad Hajibabaei, Canada’s iBOL Science Committee member for Centre for Biodiversity Genomics at the University of Guelph in Canada discussed the latest updates on the use of DNA metabarcoding to study biodiversity across all life, from microbes to mammals. The session included five presentations ranging from revealing hidden diversity to the applications of DNA metabarcoding approaches. Discussing research in the Northwest Iberian Peninsula, Maria Fais presented on the assessment of spatio-temporal variation on meiofauna while Barbara Leite focused on investigations in macrozoobenthic communities. With a Mediterranean focus, Adria Antich discussed approaches to evaluate DNA dynamics in the benthic boundary layer between benthos and plankton. Focusing on the use of DNA barcoding to spot hidden diversity, Marcos Teixeira examined diversity in polychaetes from the Phyllodocidae family and David Varros-Garcia explored the deep-sea morid Lepidion lepidion from European waters.
Congratulations to Barbara Leite for winning the award for the best conference presentation. PHOTO CREDIT: Andreia Pacheco

Beyond the one session dedicated to DNA barcoding, there were several other sessions and poster talks that focused on the subject. The plenary speaker, Marta Pascual, used the gene COI among other genetic and genomic tools to show different cases of population genetic structure in marine organisms. DNA barcoding was also applied by Xazier Turon et al. to identify invasive ascidians and by myself and colleagues in a comprehensive analysis of DNA barcoding diversity in marine peracarids.

Two posters discussed the current status of the DNA barcoding reference libraries of non-indigenous marine species: Sofia Duarte et al. focused work in the Azores archipelago while Sofia Duarte et al. examined European coastal regionsSampieri and colleagues used different genetic markers (including COI) to identify a complex of cryptic species along South American estuaries. DNA barcoding was even applied to study the diet of crustaceans.

Select Abstracts
Antich et al. Metabarcoding the benthic boundary layer: the role of sampling method and marker characteristics in the DNA signatures obtained at the interface between benthos and plankton. doi:10.3389/conf.fmars.2019.08.00046 Barros-García et al. Phylogeography of the deep-sea morid codling Lepidion lepidion reveals the presence of two ancient Atlantic/Mediterranean lineages. doi:10.3389/conf.fmars.2019.08.00129 Campos et al. Polymerase chain reaction as a promising tool for DNA-based diet studies of crustaceans. doi:10.3389/conf.fmars.2019.08.00104 Duarte et al. Species gap analysis in DNA barcode reference libraries of marine non-indigenous species in the Azores archipelago.  doi:10.3389/conf.fmars.2019.08.00170

Duarte et al. Current status of the DNA barcode reference library of non-indigenous marine species occurring in European coastal regions. doi:10.3389/conf.fmars.2019.08.00169

Fais et al. Patterns of spatial and temporal variation in estuarine meiofaunal communities assessed through DNA metabarcoding: a case study in the Lima estuary (NW Portugal). doi:10.3389/conf.fmars.2019.08.00060
HajibabaeiFrom microbes to mammals: comprehensive analysis of biodiversity using DNA metabarcoding. doi:10.3389/conf.fmars.2019.08.00008 Leite et al. Combining artificial substrates, morphology and DNA metabarcoding for investigating macrozoobenthic communities in NW Iberia. doi:10.3389/conf.fmars.2019.08.00061

Pascual et al. Population structure in marine organisms: from genetics to genomics. doi:10.3389/conf.fmars.2019.08.00002

Sampieri et al. Cryptic or cosmopolitan? Unveiling the Laeonereis complex along South American estuaries through DNA barcoding. doi:10.3389/conf.fmars.2019.08.00108

Teixeira et al. Molecular and morphometric combo reveals extraordinary hidden diversity in European polychaetesfrom the Phyllodocidae family. doi:10.3389/conf.fmars.2019.08.00057

Turon et al. Population genomics revealed independent colonisation events of a global ascidian invader. doi:10.3389/conf.fmars.2019.08.00043

Vieira et al. Evolutionary insights derived from comprehensive analyses of DNA barcoding diversity in marine members of the superorder Peracarida (Crustacea: Malacostraca) doi:10.3389/conf.fmars.2019.08.00058

 All conference abstracts were published in Frontiers.

Written by

Pedro Vieira

Pedro Vieira

University of Minho, Braga, Portugal

November 28, 2019

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The Diversification and Evolution of Marine Invertebrates in Oceanic Islands

The Diversification and Evolution of Marine Invertebrates in Oceanic Islands

The Diversification and Evolution of Marine Invertebrates in Oceanic Islands

Unravelling long-established divergence patterns and remarkable geographic segregation that has endured over millions of years in marine invertebrates.

Macaronesian rocky shores. PHOTO CREDIT: Pedro Vieira, Mafalda Tavares, Henrique Queiroga

Oceanic islands constitute prime evolutionary grounds for terrestrial organisms, promoting extensive isolation and harboring exceptional levels of diversity and endemism. Marine organisms, on the contrary, are not expected to experience evolutionary forces with the same intensity and, therefore, their diversification and evolution in oceanic landscapes has been somewhat disregarded.

Shore-dwelling marine benthic invertebrates are unique relative to both terrestrial organisms and other marine taxa. Most shore species have planktonic larvae that facilitate dispersal over open water. However, some small invertebrates, such as free-living peracarids (Peracarida: Crustacea), are more prone to isolation due to life histories characterized by direct development and putatively reduced vagility.

As a result of a DNA barcode-based screening of the diversity of littoral peracarids along Macaronesia and nearby continental shores, we have found an exceptional amount of cryptic diversity, together with a very structured geographic assortment within multiple morphospecies. We investigated, with particular detail, two common and distinct peracarid taxa present in the Macaronesian archipelagos of Azores, Madeira, and Canaries, namely 3 morphospecies of the isopod genus Dynamene1 and 7 morphospecies of the amphipod family Hyalidae2. We unraveled an additional 34 suspected new species (75% endemic of Macaronesia) with no apparent discriminative morphological features, including the noteworthy cases of the isopod Dynamene edwardsi and the amphipod Apohyale stebbingi comprising 9 and 13 putative species, respectively. Adding to this surprising cryptic diversity, lineages within each morphospecies were also frequently exclusive to one island (50%), despite the general geographic proximity of the islands within each archipelago (e.g., from as little as 50 km between Porto Santo and Madeira). Globally, the genetic divergences among lineages within a morphospecies were also comparatively high (e.g., D. edwardsi up to 22% and A. stebbingi up to 21%), indicating a very deep evolutionary history in the region which pre-dates the Pleistocene glacial cycles (D. edwardsi lineages probably started diverging between 20 and 30 MYA).  

Representative study species; not to scale.
PHOTO CREDIT: Pedro Vieira

There were several noteworthy findings in these studies. First, the unexpectedly high amount of diversity and endemism in these Macaronesian marine invertebrates, even within the same archipelago. Although peracarids can be assumed to have comparatively low vagility, since they lack a planktonic larval stage, there is extensive evidence for their dispersal capability and population connectivity. Namely, both our and other authors’ studies report peracarid morphospecies displaying little genetic structure over wide geographic ranges, for example, along the European continental Atlantic coasts.

Second, we were surprised to find marked geographic segregation among the newly found species. They were frequently restricted to a single island where they constituted the only representative of the cryptic complex. To a certain extent, the geographical segregation of these peracarids more closely resemble what would be expected for terrestrial organisms than marine invertebrates.

 

A. Sampling locations for each Dynamene species. B. Reduced median network of COI data from the genus Dynamene. Size of the circles are proportional to the number of similar haplotypes. Number of mutations separating each haplotype and inferred ancestors (median vectors) are displayed in black. Links displaying a single mutation do not display the number.

PHOTO CREDIT: Pedro Vieira

Finally, the combined evidence on diversity, geographic segregation, and divergence times, unraveled long-established divergence patterns and a remarkable geographic segregation that endured over millions of years till present. Therefore, the current distribution patterns of many of these peracarids cannot be elucidated through common accounts of marine invertebrates in the north-eastern Atlantic, namely processes involving dispersal, geographic proximity or Pleistocene glacial cycles. We propose alternative mechanisms for the speciation of these invertebrates in Macaronesia, such as those involving priority effects and pre-emptive exclusion, which have been seldom evoked to explain the deep segregation in the open ocean.

In the near future, we intend to investigate the genetic variability of taxa with planktonic larvae from these oceanic islands to verify if the long-term segregation patterns are exclusive of peracarid crustaceans or, instead, are more widespread patterns in marine invertebrates in Macaronesia.

References

  1. Vieira PE, Desiderato A, Holdich DM, Soares P, Creer S, Carvalho GR, Costa FO, Queiroga H (2019) Deep segregation in the open ocean: Macaronesia as an evolutionary hotspot for low dispersal marine invertebrates. Molecular Ecology. https://doi.org/10.1111/mec.15052
  2. Desiderato A, Costa FO, Serejo CS, Abbiati M, Queiroga H, Vieira PE (2019) Macaronesian islands as promoters of diversification in amphipods: The remarkable case of the family Hyalidae (Crustacea, Amphipoda). Zoologica Scripta. https://doi.org/10.1111/zsc.12339

Written by

Pedro Vieira

Pedro Vieira

University of Minho, Braga, Portugal

Filipe Costa

Filipe Costa

University of Minho, Braga, Portugal

April 7, 2019
doi: 10.21083/ibol.v9i1.5477

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