Marc Rius

Centre d'Estudis Avançats de Blanes

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Christopher D. McQuaid

Rhodes University

Xavier Turón

Centre d'Estudis Avançats de Blanes

Luke E. Holman

University of Copenhagen

Peter R. Teske

University of Johannesburg

Jamie Hudson

National Oceanography Centre

Gary R. Carvalho

Bangor University

Simon Creer

Bangor University

Mark de Bruyn

Griffith University

Juan Carlos Castilla

Pontificia Universidad Católica de Chile

Marta Pascual

Universitat de Barcelona

Cooperative Institutions

National Museum of Natural History

Smithsonian Institution

Natural History Museum

University of Southampton

National Oceanography Centre

Centre National de la Recherche Scientifique

Universitat de Barcelona

Ghent University

Australian Museum

Google (United States)

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Cryptic speciation or global spread? The case of a cosmopolitan marine invertebrate with limited dispersal capabilities

Scientific Reports (2013)

Rocío Pérez‐Portela Vanessa Arranz Marc Rius Xavier Turón

The existence of globally-distributed species with low dispersal capabilities is a paradox that has been explained as a result of human-mediated transport and by hidden diversity in the form of unrecognized cryptic species. Both factors are not mutually exclusive, but relatively few studies have demonstrated the presence of both. Here we analyse the genetic patterns of the colonial ascidian Diplosoma listerianum, a species nowadays distributed globally. The study of a fragment of a mitochondrial gene in localities worldwide revealed the existence of multiple cryptic species. In addition, we found a complex geographic structure and multiple clades occurred in sympatry. One of the species showed strong population structure irrespective of geographical distances, which is coherent with stochastic dispersal linked to human transport. The present study shows the complexity of discerning the role of cryptic diversity from human-driven range shifts worldwide, as well as disentangling the effects of natural and artificial dispersal.

Species complex

Genetic algorithm

Cosmopolitan distribution

Marine invertebrates

10.1038/srep03197

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Citations (87)

Author response for "Contemporary climate change hinders hybrid performance of ecologically dominant marine invertebrates"

Jamie Hudson Christopher D. McQuaid Marc Rius

Marine invertebrates

10.1111/jeb.13609/v2/response1

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Citations (0)

Environmental DNA sampling protocols for the surveillance of marine non-indigenous species in Irish coastal waters

Marine Pollution Bulletin (2021)

Sara Fernández Dulaney Miller Luke E. Holman Adriaan Gittenberger Alba Ardura

Environmental DNA

Environmental Monitoring

10.1016/j.marpolbul.2021.112893

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Citations (16)

Tracking Invasion Histories in the Sea: Facing Complex Scenarios Using Multilocus Data

PLoS ONE (2012)

Marc Rius Xavier Turón Víctor Ordóñez Marta Pascual

In recent years, new analytical tools have allowed researchers to extract historical information contained in molecular data, which has fundamentally transformed our understanding of processes ruling biological invasions. However, the use of these new analytical tools has been largely restricted to studies of terrestrial organisms despite the growing recognition that the sea contains ecosystems that are amongst the most heavily affected by biological invasions, and that marine invasion histories are often remarkably complex. Here, we studied the routes of invasion and colonisation histories of an invasive marine invertebrate Microcosmus squamiger (Ascidiacea) using microsatellite loci, mitochondrial DNA sequence data and 11 worldwide populations. Discriminant analysis of principal components, clustering methods and approximate Bayesian computation (ABC) methods showed that the most likely source of the introduced populations was a single admixture event that involved populations from two genetically differentiated ancestral regions - the western and eastern coasts of Australia. The ABC analyses revealed that colonisation of the introduced range of M. squamiger consisted of a series of non-independent introductions along the coastlines of Africa, North America and Europe. Furthermore, we inferred that the sequence of colonisation across continents was in line with historical taxonomic records - first the Mediterranean Sea and South Africa from an unsampled ancestral population, followed by sequential introductions in California and, more recently, the NE Atlantic Ocean. We revealed the most likely invasion history for world populations of M. squamiger, which is broadly characterized by the presence of multiple ancestral sources and non-independent introductions within the introduced range. The results presented here illustrate the complexity of marine invasion routes and identify a cause-effect relationship between human-mediated transport and the success of widespread marine non-indigenous species, which benefit from stepping-stone invasions and admixture processes involving different sources for the spread and expansion of their range.

Colonisation

Ancient DNA

10.1371/journal.pone.0035815

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Citations (55)

Ecological Dominance Along Rocky Shores, with a Focus on Intertidal Ascidians

CRC Press eBooks (2017)

Marc Rius Peter R. Teske Patricio H. Manríquez Rocío Suárez-Jiménez Christopher D. McQuaid

This chapter reviews the ecological and evolutionary mechanisms that facilitate dominance along rocky coastlines. It focuses on a prominent example, the members of the Pyura stolonifera species complex, which are an emerging model system for studying ecological dominance. Interest in ecological dominance extends across a wide range of fields including paleontology and anthropology. In order to understand how ecological dominance can influence overall community structure, it is important to recognize that competition can take various forms. Ecological dominance along rocky shores is achieved by a small, taxonomically-diverse group of species. Dominant species are key components for the conservation of biodiversity and ecosystem functioning along rocky shores. Both Adelaide and Corner Inlet lack rocky shores and are dominated by sandy shores, with artificial structures such as jetties and piers representing the only habitat suitable for settlement.

Rocky shore

Dominance (genetics)

Intertidal ecology

10.1201/b21944-4

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Citations (18)

Long-term coexistence of non-indigenous species in aquaculture facilities

Marine Pollution Bulletin (2011)

Marc Rius Kevin Heasman Christopher D. McQuaid

10.1016/j.marpolbul.2011.08.030

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Citations (42)

Hudson_etal.pyura_all_loci.vcf

Figshare (2021)

Jamie Hudson Juan Carlos Castilla Peter R. Teske Luciano B. Beheregaray Ivan D. Haigh

VCF file containing 1,205 single nucleotide polymorphisms (SNPs) derived from genotype-by-sequencing of 190 Pyura praeputialis individuals as outlined in the associated manuscript.

10.6084/m9.figshare.14611332

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Human harvesting of <i>Mytilus galloprovincialis</i> Lamarck, 1819, on the central coast of Portugal

Scientia Marina (2004)

Henrique N. Cabral Marc Rius

The Mediterranean mussel, Mytilus galloprovincialis Lamarck, 1819, has traditionally been removed from the shore by humans in coastal areas to supplement diet, for commerce or for bait.On exposed rocky shores of the central coast of Portugal, humans are an important intertidal predator, especially of mussels and of the pedunculate barnacle Pollicipes pollicipes (Gmelin, 1789).Four rocky shore sites near Cabo Raso with different levels of accessibility were compared in terms of harvesting pressure, substratum cover, density and size structure of M. galloprovincialis.Sampling surveys were conducted from March to September 2002.For substratum cover determinations a 50 cm x 50 cm square was used, while density and size structure were estimated based on scrapings performed on a 10 cm x 10 cm area.A log-linear model was used to evaluate human harvesting according to several factors.Significant differences in the harvesting intensity were related to accessibility, type of day (weekday, weekend or holiday), period of the day, weather and tidal amplitude.The differences relative to zone were not significant.The least accessible site (0.30 person day -1 ) showed the highest values of substratum cover, and a negative correlation was found between number of harvesters and substratum cover by mussels.Size distribution also varied considerably according to site.The major difference that was noticed was that less accessible sites showed a higher number of large individuals than more accessible areas.Density in the most accessible location showed a clear decline, above all after summer holidays.Over the study period, in the more accessible sites biomass decreased while in the other locations it increased.Long-term studies are necessary to determine the real magnitude and effects of human disturbances in intertidal communities.

10.3989/scimar.2004.68n4545

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Citations (33)

The relationship between human exploitation pressure and condition of mussel populations along the south coast of South Africa

South African Journal of Science (2006)

Marc Rius Sven Kaehler Christopher D. McQuaid

Human exploitation of intertidal organisms in South Africa is an ancient activity based principally on mussels. We studied mussel populations and patterns of exploitation along a 160-km stretch of the south coast. Photographs (100 per site) were taken of the intertidal rocks at each of 14 sites, covering a range of exploitation intensities. Percentage cover was negatively correlated with number of mussel patches and positively correlated with mean shell width. PCA analysis identified groups of sites: a) accessible and unprotected sites: low cover, small mussels, patchy distribu- tion; b) inaccessible sites and sites next to, or within, nature reserves: high percentage cover, large animals, less patchy distri- butions. Affluent coastal settlements also seem to confer protec- tion against harvesting. Harvester distribution was examined by aerial surveys and combined with information on distance to the nearest beach access point and number of households within 7 km for each site. Sites within reserves and inaccessible sites had low densities of collectors, whereas sites near urban areas and in the Ciskei had the highest densities. All correlations between indica- tors of human exploitation and condition of mussel populations were non-significant. However, number of collectors showed posi- tive trends with number of patches and negative trends for the two other variables. The results indicate much lower levels of exploita- tion than in the neighouring Transkei region, and suggest a high degree of background variability in mussel population structure.

Human settlement

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Citations (39)

How Anthropogenic Activities Affect the Establishment and Spread of Non-Indigenous Species Post-Arrival

CRC Press eBooks (2017)

Emma L. Johnston Katherine A. Dafforn Graeme F. Clark Marc Rius Oliver Floerl

Affect

10.1201/b21944-6

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Citations (30)