Mitochondrial DNA sequence data reveal the origins of postglacial marine macroalgal flora in the Northwest Atlantic

Bringloe, Trevor T.; Saunders, Gary W.

doi:10.3354/meps12496

Cited by 27 publications

(21 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our new Austrokallymenia and Psaromenia species reported herein, as well as the other examples noted above, display rbc L divergence typically in the 2%–5% range from their Pacific congeners, which indicates separation ~2–4 Mya based on the molecular clock used in Bringloe and Saunders (). This timeframe would allow for Pacific to Caribbean migrations prior to the closing of open waters between the Americas by the Isthmus of Panama ~2.8 Mya (O'Dea et al.…”

Section: Discussionsupporting

confidence: 61%

Collections from the mesophytic zone off Bermuda reveal three species of Kallymeniaceae (Gigartinales, Rhodophyta) in genera with transoceanic distributions

Schneider

Popolizio

Saunders

2019

Journal of Phycology

View full text Add to dashboard Cite

A molecular survey of red algae collected by technical divers and submersibles from 90 m in the mesophotic zone off the coast of Bermuda revealed three species assignable to the Kallymeniaceae. Two of the species are representative of recently described genera centered in the western Pacific in Australia and New Zealand, Austrokallymenia and Psaromenia and the third from the Mediterranean Sea and the eastern Atlantic, Nothokallymenia. A phylogenetic analysis of concatenated mitochondrial (COI‐5P) and chloroplast (rbcL) genes, as well as morphological characteristics, revealed that two are shown to be new species with distant closest relatives (N. erosa and Psaromenia septentrionalis), while the third represents a deep water western Atlantic species now moved to an Australasian genus (A. westii).

show abstract

Section: Discussionsupporting

confidence: 61%

Collections from the mesophytic zone off Bermuda reveal three species of Kallymeniaceae (Gigartinales, Rhodophyta) in genera with transoceanic distributions

Schneider

Popolizio

Saunders

2019

Journal of Phycology

View full text Add to dashboard Cite

show abstract

“…, Neiva et al. , Bringloe and Saunders ). After the Last Glacial Maximum (LGM), it is assumed that climatic amelioration allowed species to expand their range poleward from the populations located at low latitude margins (Davis and Shaw ).…”

mentioning

confidence: 97%

“…Phylogeographic approaches, generally using uniparentally inherited molecular markers, are powerful tools for inferring past range contraction and expansion and to establish evolutionary origin of genetic characteristics of present-day populations (Avise 2000). The late Pleistocene glaciations are recognized as important factors that favored the divergence of populations and ultimately speciation via repeated isolation in allopatric refuges (Hewitt 1996, Maggs et al 2008, Neiva et al 2016, Bringloe and Saunders 2018. After the Last Glacial Maximum (LGM), it is assumed that climatic amelioration allowed species to expand their range poleward from the populations located at low latitude margins (Davis and Shaw 2001).…”

mentioning

confidence: 99%

Dual influence of terrestrial and marine historical processes on the phylogeography of the Brazilian intertidal red alga Gracilaria caudata

Ayres-Ostrock

Valéro

Mauger

et al. 2019

Journal of Phycology

View full text Add to dashboard Cite

In this study, we explored how past terrestrial and marine climate changes have interacted to shape the phylogeographic patterns of the intertidal red seaweed Gracilaria caudata, an economically important species exploited for agar production in the Brazilian north‐east. Seven sites were sampled along the north‐east tropical and south‐east sub‐tropical Brazilian coast. The genetic diversity and structure of G. caudata was inferred using a combination of mitochondrial (COI and cox2‐3), chloroplast (rbcL) and 15 nuclear microsatellite markers. A remarkable congruence between nuclear, mitochondrial and chloroplast data revealed clear separation between the north‐east (from 03° S to 08° S) and the south‐east (from 20° S to 23° S) coast of Brazil. These two clades differ in their demographic histories, with signatures of recent demographic expansions in the north‐east and divergent populations in the south‐east, suggesting the maintenance of several refugia during the last glacial maximum due to sea‐level rise and fall. The Bahia region (around 12° S) occupies an intermediate position between both clades. Microsatellites and mtDNA markers showed additional levels of genetic structure within each sampled site located south of Bahia. The separation between the two main groups in G. caudata is likely recent, probably occurring during the Quaternary glacial cycles. The genetic breaks are concordant with (i) those separating terrestrial refugia, (ii) major river outflows and (iii) frontiers between tropical and subtropical regions. Taken together with previously published eco‐physiological studies that showed differences in the physiological performance of the strains from distinct locations, these results suggest that the divergent clades in G. caudata correspond to distinct ecotypes in the process of incipient speciation and thus should be considered for the management policy of this commercially important species.

show abstract

“…For one, refugia in the Northwest Atlantic have been increasingly recognized, downplaying the importance of postglacial recolonization from European refugia (2, 16, 17). Trans-Atlantic populations of marine flora also typically exhibit genetic divergence, corresponding to isolation events during the Pleistocene, further supporting the notion that an abundant marine flora was available to recolonize the Artic out of the Northwest Atlantic (18). Assis et al (2) also used ecological niche modelling to hindcast kelp distributions during the LGM, which suggested several species likely survived glaciation in the Northwest Atlantic, a result further supported in the hindcasting results presented here (Fig.…”

Section: Discussionmentioning

confidence: 56%

Population structure in Arctic marine forests is shaped by diverse recolonisation pathways and far northern glacial refugia

Bringloe

Verbruggen

Saunders

2020

Preprint

View full text Add to dashboard Cite

20The Arctic is experiencing a rapid shift towards warmer regimes, calling for a need to understand 21 levels of biodiversity and ecosystem responses to climate cycles. This study examines marine 22 refugial locations during the Last Glacial Maximum in order to link recolonization pathways to 23 patterns of genetic diversity in Arctic marine forests. We present genetic data for 109 species of 24 seaweed to infer community-level patterns, and hindcast species distributions during the Last 25 Glacial Maximum to further pinpoint likely refugial locations. Sequence data revealed 26 contiguous populations extending from the Bering Sea to the Northwest Atlantic, with high 27 levels of genetic diversity in the East Canadian Arctic. One fifth of the species sampled appeared 28 restricted to Arctic waters. Hindcasted species distributions highlighted refugia in the Bering 29 Sea, Northwest Atlantic, South Greenland, and Europe. We hypothesize that Arctic coastal 30 systems were recolonized from many geographically disparate refugia leading to enriched 31 diversity levels in the East Canadian Arctic, with important contributions stemming from 32 northerly refugia likely centered along Southern Greenland. Moreover, we hypothesize these 33 northerly refugia likely played a key role in promoting polar endemic diversity, as reflected by 34 abundant unique population haplotypes and endemic species in the East Arctic. 35 36 Significance Statement 37 Our work challenges the existing paradigm that marine Arctic ecosystems are depauperate 38 extensions of southerly (temperate) communities established in the wake of recent glaciation, 39 fundamentally changing how these systems should be viewed and interpreted. We forward novel 40 hypotheses regarding the recent history of Arctic marine systems, particularly with regards to 41 endemism being an integral feature of Arctic biomes, and present a firm framework for future 42 evolutionary research in this system typically viewed as "ecologically immature." 43 44 MAIN TEXT 45 46 The Arctic is characterized by a turbulent climatic history and the prospect of further 48 change. Repeated glaciations over the past 2.6 Ma had a lasting impact on biological 49 communities, forcing populations to repeatedly contract and expand with the formation and 50 retreat of ice-sheets (1). Today, warming in the Arctic is significantly exceeding the Northern 51 Hemisphere average, and boreal and temperate regimes are expected to shift northwards as a 52 result (2). A prescient need exists to understand the responses of Arctic marine communities to 53 climate change, a need that will inherently depend on understanding levels of biodiversity, the 54 recent history of Arctic ecosystems, and ultimately the potential for adaptation. 55 56 Marine forests are a model system for providing such insight on Arctic marine 57 communities. Marine forests are structurally complex seascapes created by seaweeds, are 58 ubiquitous worldwide, and provide valuable ecosystem and economic services in the forms of 59 habita...

show abstract

Mitochondrial DNA sequence data reveal the origins of postglacial marine macroalgal flora in the Northwest Atlantic

Cited by 27 publications

References 53 publications

Collections from the mesophytic zone off Bermuda reveal three species of Kallymeniaceae (Gigartinales, Rhodophyta) in genera with transoceanic distributions

Collections from the mesophytic zone off Bermuda reveal three species of Kallymeniaceae (Gigartinales, Rhodophyta) in genera with transoceanic distributions

Dual influence of terrestrial and marine historical processes on the phylogeography of the Brazilian intertidal red alga Gracilaria caudata

Population structure in Arctic marine forests is shaped by diverse recolonisation pathways and far northern glacial refugia

Contact Info

Product

Resources

About