True limpets of the genus Nacella (Patellogastropoda: Nacellidae) include at least 11 nominal species distributed in different provinces Southern Ocean. Here, we present new molecular analyses and a comprehensive morphological revision confirming validity all currently recognized species, but with important amendments to published distributions several. We also show that specimens collected along two fjords Beagle Channel, southern South America, constitute taxon: yaghana sp. nov. The...

Abstract Common inhabitants of Antarctic and Subantarctic rocky shores, the limpet genus Nacella , includes 15 nominal species distributed in different provinces Southern Ocean. The Magellanic Province represents area with highest diversity genus. Phylogenetic reconstructions showed an absence reciprocal monophyly high levels genetic identity among this therefore imply a recent diversification southern South America. Because most these taxa coexist along their distribution range clear...

Patagonia extends for more than 84,000 km of irregular coasts is an area especially apt to evaluate how historic and contemporary processes influence the distribution connectivity shallow marine benthic organisms. The true limpet Nacella magellanica has a wide in this province represents suitable model infer Quaternary glacial legacy on This species inhabits ice-free rocky ecosystems, narrow bathymetric range consequently should have been severely affected by recurrent cycles during...

Abstract Aim We use an integrative biogeographical approach to further understand the evolution of important Southern Ocean marine benthic element, limpet genus Nacella (Mollusca: Patellogastropoda). Location Ocean. Methods used multi‐locus time‐calibrated phylogeny at scale whole elucidate underlying processes involved in origin and diversification genus. Results Divergence‐time estimates suggest that soon after its during mid‐Miocene ( c . 12.5 Ma), separated into two main lineages...

Abstract Aim We assess biogeographical patterns, population structure and the range of species in pulmonate genus Siphonaria across sub‐Antarctic. hypothesized that locally endemic cryptic will be found distribution these direct‐developing limpets Location The sub‐Antarctic coasts Southern Ocean including South America, Falkland/Malvinas, Georgia, Kerguelen Macquarie Islands. Methods Multi‐locus phylogenetic reconstructions, mt DNA time‐calibrated divergence time estimations population‐based...

ABSTRACT Problem Rafting is now recognised as a key process influencing the distribution and connectivity of several marine coastal species. scenarios are, however, often invoked in ways that do not account for clear differences biogeographic outcomes. Here, we illustrate value utilising multiple lines evidence (e.g. different life histories, ecologies, dispersal frequencies) elucidating historical, modern, future significance ocean rafting. We discuss these issues using range exemplar...

Diversity, abundance and composition of taxonomic groups in the Southern Ocean differ from elsewhere planet, since biogeography this region refl ects complex interactions tectonics, oceanography, climate biological elements Eocene.Several marine benthic organisms exhibit high levels genetic divergence among provinces region, supporting existence a vicariance process through plate while other with dispersive capacity recent processes.Moreover, discovery non-Antarctic decapod larvae Antarctic...

How the near-shore marine benthic communities survived Quaternary glaciations in Antarctica is a major question for Southern Ocean biogeographers. Several hypotheses that consider life-history traits, such as bathymetric ranges and developmental modes, have been proposed. Near-shore species with high dispersive potential are expected to show star-like genealogies, broadly distributed haplotypes surrounded by closely related variants at low frequencies, consequence of rapid population...

Connectivity is a fundamental process of population dynamics in marine ecosystems. In the last decade, with emergence new methods, combining different approaches to understand patterns connectivity among populations and their regulation has become increasingly feasible. The Western Antarctic Peninsula (WAP) characterized by complex oceanographic dynamics, where local conditions could act as barriers connectivity. Here, notothenioid fish Harpagifer antarcticus, demersal species life cycle...

Major geologic and climatic changes during the Quaternary exerted a major role in shaping past contemporary distribution of genetic diversity structure aquatic organisms southern South America. In fact, northern glacial limit along Pacific coast, an area environmental terms topography, currents, water salinity, represents biogeographic transition for marine freshwater species. We used mitochondrial DNA sequences (D-loop) to investigate consequences cycles over pattern G. maculatus (Pisces:...

Abstract Aim The Antarctic Circumpolar Current imparts significant structure to the Southern Ocean biota. Polar Front is a major barrier dispersal, with separate species (or sometimes intraspecific clades) normally occurring either side of this feature. We examined biogeographic an apparent exception rule in widespread genus Ocean, periwinkle snail, Laevilitorina. Location Ocean. Taxon Littorinidae, Laevilitorininae, Laevilitorina . Methods Using 750 specimens from 16 populations across...

Marine species have colonized extreme environments during evolution such as freshwater habitats. The amphidromous teleost fish, Galaxias maculatus is found mainly migrating between estuaries and rivers, but some landlocked populations been described in lakes formed the last deglaciation process Andes. In present study we use mtDNA sequences to reconstruct historical scenario of colonization a lake evaluated osmoregulatory shift associated changes habitat life cycle populations.Standard...

Abstract The southern coastline of South America is a remarkable area to evaluate how Quaternary glacial processes impacted the demography near-shore marine biota. Here we present new phylogeographic analyses in pulmonate Siphonaria lessonii across its distribution, from northern Chile Pacific Uruguay Atlantic. Contrary our expectations, populations southwestern Atlantic, an that was less by ice during maxima, showed low genetic diversity and evidence recent expansion, similar patterns...

One of the most relevant characteristics extant Southern Ocean fauna is its resiliency to survive glacial processes Quaternary. These climatic events produced catastrophic habitat reductions and forced some marine benthic species move, adapt or go extinct. The inhabiting Antarctic upper continental shelf faced Quaternary glaciations with different strategies that drastically modified population sizes thus affected amount distribution intraspecific genetic variation. Here we present new...

Galaxias maculatus (Pisces: Galaxiidae) commonly known as "puye" has a disjunct distribution along the Southern Hemisphere including landlocked and migratory populations at latitudes over 30°S in South America, Australia, Tasmania, New Zealand. Chilean artisanal fishery of G. become less important resource due to multiple factors overexploitation, pollution, introduction predators, competitors. At same time, current conservation status species Chile is still uncertain. Here, we used mtDNA...

Resumen.-La identificación de especies se establece como una las principales etapas para cualquier estudio sobre biodiversidad, en especial frente a cambios globales y sus repercusiones.Es por esto que requiere un amplio conocimiento taxonómico los diferentes grupos organismos.La herramienta ADN barcoding ha sido descrita importante alternativa estudios morfológicos tradicionales, permitiendo complementar técnicas número taxa.En este estudio, analiza la divergencia genética intraespecífica e...

Interactions between algae and herbivores can be affected by various factors, such as seasonality habitat structure. Among inhabiting marine systems, species of the order Patellogastropoda are considered key organisms in many rocky coasts world. Nacella one most dominant macro-herbivores on shores sub-Antarctic ecoregion Magellan. However, importance its role must associated with trophic ecology. The objective this work was to evaluate spatial temporal variabilities dietary composition two...