The role of cryptic dispersal in shaping connectivity patterns of marine populations in a changing world

David, Andrew A.; Loveday, Benjamin R.

doi:10.1017/s0025315417000236

Cited by 14 publications

(13 citation statements)

References 59 publications

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“…How many such species–ranging from foraminiferans, sponges, hydroids, flatworms, polychaetes, amphipods, and sea spiders to bryozoans and sea squirts–have become Flying Dutchmen, sailing the seas without a known home, we have as yet no idea. David et al (2016) and David and Loveday (2017) refer to the widespread dispersal of individuals by anthropogenic vectors as “cryptic dispersal.” Observing that human-mediated movement may be an important contributor to gene flow, they note that such movements may conceal or erode signals of past phylogeographic structure. “If cryptic dispersal has been occurring across long timescales” (as we suggest here for Flying Dutchmen), “even genetic patterns inferred from mtDNA may be obscured via reshuffling of ancient haplotypes due to past translocation events” (David and Loveday, 2017).…”

Section: Neocosmopolitanism:human-mediated Spread and The Creation Ofmentioning

confidence: 99%

A Framework for Understanding Marine Cosmopolitanism in the Anthropocene

Darling

Carlton

2018

Front. Mar. Sci.

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Recent years have witnessed growing appreciation for the ways in which human-mediated species introductions have reshaped marine biogeography. Despite this we have yet to grapple fully with the scale and impact of anthropogenic dispersal in both creating and determining contemporary distributions of marine taxa. In particular, the past several decades of research on marine biological invasions have revealed that broad geographic distributions of coastal marine organisms—historically referred to simply as “cosmopolitanism”—may belie complex interplay of both natural and anthropogenic processes. Here we describe a framework for understanding contemporary cosmopolitanism, informed by a synthesis of the marine bioinvasion literature. Our framework defines several novel categories in an attempt to provide a unified terminology for discussing cosmopolitan distributions in the world’s oceans. We reserve the term eucosmopolitan to refer to those species for which data exist to support a true, natural, and prehistorically global (or extremely broad) distribution. While in the past this has been the default assumption for species observed to exhibit contemporary cosmopolitan distributions, we argue that given recent advances in marine invasion science this assignment should require positive evidence. In contrast, neocosmopolitan describes those species that have demonstrably achieved extensive geographic ranges only through historical anthropogenic dispersal, often facilitated over centuries of human maritime traffic. We discuss the history and human geography underpinning these neocosmopolitan distributions, and illustrate the extent to which these factors may have altered natural biogeographic patterns. We define the category pseudocosmopolitan to encompass taxa for which a broad distribution is determined (typically after molecular investigation) to reflect multiple, sometimes regionally endemic, lineages with uncertain taxonomic status; such species may remain cosmopolitan only so long as taxonomic uncertainty persists, after which they may splinter into multiple geographically restricted species. We discuss the methods employed to identify such species and to resolve both their taxonomic status and their biogeographic histories. We argue that recognizing these different types of cosmopolitanism, and the important role that invasion science has played in understanding them, is critically important for the future study of both historical and modern marine biogeography, ecology, and biodiversity.

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Section: Neocosmopolitanism:human-mediated Spread and The Creation Ofmentioning

confidence: 99%

A Framework for Understanding Marine Cosmopolitanism in the Anthropocene

Darling

Carlton

2018

Front. Mar. Sci.

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“…The lack of distinct northern and southern hemisphere groupings could be due to cryptic dispersal where frequent anthropogenic transport could dilute phylogeographic signal and consequently decrease the value of standard population genetic parameters (e.g. F ST ) [ 22 ].…”

Section: Main Textmentioning

confidence: 99%

Global connectivity patterns of the notoriously invasive mussel, Mytilus galloprovincialis Lmk using archived CO1 sequence data

Pickett

David

2018

BMC Res Notes

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ObjectiveThe invasive mussel, Mytilus galloprovincialis has established invasive populations across the globe and in some regions, have completely displaced native mussels through competitive exclusion. The objective of this study was to elucidate global connectivity patterns of M. galloprovincialis strictly using archived cytochrome c oxidase 1 sequence data obtained from public databases. Through exhaustive mining and the development of a systematic workflow, we compiled the most comprehensive global CO1 dataset for M. galloprovincialis thus far, consisting of 209 sequences representing 14 populations. Haplotype networks were constructed and genetic differentiation was assessed using pairwise analysis of molecular variance.ResultsThere was significant genetic structuring across populations with significant geographic patterning of haplotypes. In particular, South Korea, South China, Turkey and Australasia appear to be the most genetically isolated populations. However, we were unable to recover a northern and southern hemisphere grouping for M. galloprovincialis as was found in previous studies. These results suggest a complex dispersal pattern for M. galloprovincialis driven by several contributors including both natural and anthropogenic dispersal mechanisms along with the possibility of potential hybridization and ancient vicariance events.Electronic supplementary materialThe online version of this article (10.1186/s13104-018-3328-3) contains supplementary material, which is available to authorized users.

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“…Furthermore, direct evidence of rafting on kelp has been observed in the widespread sub-Antarctic brooding bivalve Gasimardia trapesina (Helmuth et al, 1994), the sea slug Onchidella marginata (Cumming et al, 2014) and two species of sub-Antarctic amphipods (Nikula et al, 2010). An additional factor that could influence population connectivity is anthropogenic transport (David and Loveday, 2017). We have limited knowledge of the extent or potential growth of this in the Southern Ocean however there is evidence of anthropogenic transport of non-native species into the Antarctic (Lee and Chown, 2007).…”

Section: The Use Of Particle Tracking Analysis To Understand Antarctimentioning

confidence: 99%

Distributional Patterns of Polychaetes Across the West Antarctic Based on DNA Barcoding and Particle Tracking Analyses

et al. 2017

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Recent genetic investigations have uncovered a high proportion of cryptic species within Antarctic polychaetes. It is likely that these evolved in isolation during periods of glaciation, and it is possible that cryptic populations would have remained geographically restricted from one another occupying different regions of Antarctica. By analysing the distributions of nine morphospecies, (six of which contained potential cryptic species), we find evidence for widespread distributions within the West Antarctic. Around 60% of the cryptic species exhibited sympatric distributions, and at least one cryptic clade was found to be widespread. Additional DNA barcodes from GenBank and morphological records extended the observed range of three species studied here, and indicate potential circum-Antarctic traits. Particle tracking analyses were used to model theoretical dispersal ranges of pelagic larvae. Data from these models suggest that the observed species distributions inferred from genetic similarity could have been established and maintained through the regional oceanographic currents, including the Antarctic Circumpolar Current (ACC) and its coastal counter current. Improved understanding of the distribution of Antarctic fauna is essential for predicting the impacts of environmental change and determining management strategies for the region.

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The role of cryptic dispersal in shaping connectivity patterns of marine populations in a changing world

Cited by 14 publications

References 59 publications

A Framework for Understanding Marine Cosmopolitanism in the Anthropocene

A Framework for Understanding Marine Cosmopolitanism in the Anthropocene

Global connectivity patterns of the notoriously invasive mussel, Mytilus galloprovincialis Lmk using archived CO1 sequence data

Distributional Patterns of Polychaetes Across the West Antarctic Based on DNA Barcoding and Particle Tracking Analyses

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