Krill evolution and the Antarctic ocean currents: evidence of vicariant speciation as inferred by molecular data

Patarnello, Tomaso; Bargelloni, Luca; Varotto, Vittorio; Battaglia, B.

doi:10.1007/bf00351327

Cited by 80 publications

(64 citation statements)

References 15 publications

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“…Genetic divergence of Antarctic species (Euphausia superba Dana 1852, Euphausia crystallorophias Holt and Tattersall 1906) from the Subantarctic species Euphausia vallentini Stebbing 1900 was estimated at ca. 20 million years, which is consistent with the formation of a circum-Antarctic water circulation and the Antarctic Polar Front (Patarnello et al, 1996).…”

Section: Linkages In a Spatial Gradientsupporting

confidence: 73%

Plankton of Southern Chilean fjords: trends and linkages

Antezana¹

1999

Sci. Mar.

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SUMMARY: The present paper compiles and reviews past and recent results from Magellan and Fuegian fjords for an overview of the planktonic assemblage there. It first examines linkages to local, adjacent and remote environments. The plankton assemblage presents deviations from the biota of the Magellan biogeographic Province, where the occasional presence of Antarctic species is related to oceanographic phenomena at the Polar Front. Complex bathymetric and hydrographic features within the fjords suggest that the plankton is rather isolated. Adaptations and constraints for population survival, and the role of diel migrators and gregarious zooplankters with regard to bentho-pelagic coupling are discussed. Results on seasonal differences in the plankton of the largest and most isolated basin of the Strait of Magellan are compiled. In spring the plankton was dominated by large diatoms suggesting a short food chain where most of the phytoplankton bloom goes to the bottom, to the meroplankton and to a few dominant holoplankters. In summer, the phytoplankton was dominated by picoand nanophytoplankton suggesting a more complex food web mediated by a bacterial loop. High abundance of holo-and meroplanktonic larvae coincided with spring blooming conditions. Key words: Estuarine, Subantarctic, adaptations, patterns, seasonal, migration, food webs. RESUMEN: PLANCTON DE LOS FIORDOS DEL SUR DE CHILE: TENDENCIAS Y CONEXIONES. -Este trabajo compila y revisa los resultados pasados y recientes de los fiordos fueguinos y magallánicos para proporcionar una visión integral de la comunidad planctónica. Primero se examinan las conexiones con los ambientes locales adyacentes y remotos. La comunidad planctónica presenta desviaciones de la biota de la Provincia biogeográfica Magallánica, donde la presencia ocasional de especies antárticas se relaciona con fenómenos oceanográficos en el Frente Polar. Rasgos batimétricos e hidrográficos complejos en los fiordos sugieren que el plancton está más bien aislado. Se discuten las adaptaciones y limitaciones para la supervivencia poblacional y el papel de los migradores diarios y del zooplancton gregario con respecto al acoplamiento bentopelágico. Se resumen los resultados sobre diferencias estacionales en el plancton de la más vasta y aislada cuenca del Estrecho de Magallanes. En primavera, el plancton estuvo dominado por diatomeas grandes, sugiriendo una cadena trófica corta, en la que la mayor parte de la biomasa producida va al fondo, al meroplancton y a unos pocos organismos dominantes del holoplancton. En verano, el fitoplancton estuvo dominado por pico-y nanofitoplancton, sugiriendo una red trófica más compleja mediada por un bucle bacteriano. La gran abundancia de larvas holo-y meroplanctónicas coincidió con las condiciones de proliferación primaveral.

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Section: Linkages In a Spatial Gradientsupporting

confidence: 73%

Plankton of Southern Chilean fjords: trends and linkages

Antezana¹

1999

Sci. Mar.

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“…The Antarctic krill cox1 GenBank accession and cDNA sequences were included for comparative tests for numts, and the other accessions were included for tests of species membership: the Antarctic E. crystallorophias was used because it appears to be the sister species of E. superba, and the sub-Antarctic E. vallentini was included as an out-group (c.f. Patarnello et al, 1996). After alignment, trimming and removal of identical sequences, alignment B consisted of 292 sequences that were 579 bases long.…”

Section: Investigating Sequencing Errormentioning

confidence: 99%

Swarms of diversity at the gene cox1 in Antarctic krill

et al. 2010

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“…With the opening of the Drake Passage (some 28 to 23 Ma ago) and the establishment of the Scotia Arc the circumpolar current became gradually effective and this led to another decline in the Antarctic surface water temperature (Crame, 1992;Clarke and Crame, 1992). The final formation of a deep-sea passage between South America and Antarctica was probably a key event for the evolution of many taxa of these environments, as shown for the Antarctic krill (Euphausia superba and E. crystallorophias) and E. vallentinii from the Subantarctic (Patarnello et al, 1996).…”

Section: Historical Background For the Evolution Of The Peracarida (Hmentioning

confidence: 99%

On the origin and evolution of Antarctic Peracarida (Crustacea, Malacostraca)

Brandt¹

1999

Sci. Mar.

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Krill evolution and the Antarctic ocean currents: evidence of vicariant speciation as inferred by molecular data

Cited by 80 publications

References 15 publications

Plankton of Southern Chilean fjords: trends and linkages

Plankton of Southern Chilean fjords: trends and linkages

Swarms of diversity at the gene cox1 in Antarctic krill

On the origin and evolution of Antarctic Peracarida (Crustacea, Malacostraca)

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