Polar Biology

, Volume 36, Issue 7, pp 957–968 | Cite as

A re-evaluation of morphological characters of the invasive ascidian Corella eumyota reveals two different species at the tip of South America and in the South Shetland Islands, Antarctica

  • Gastón Alurralde
  • Luciana Torre
  • Evangelina Schwindt
  • Juan C. Castilla
  • Marcos Tatián
Original Paper

Abstract

The native solitary ascidian Corella eumyota Traustedt, 1882) is commonly found in the Southern Hemisphere in the cold-temperate waters of the Subantarctic and Antarctic regions. Its recent spread into the Northern Hemisphere throughout the NE Atlantic gave the species the status of invasive. Together with its widespread distribution, reports on its wide variability (several distinct morphological characters, genetic discontinuities and also possible misidentifications) cast doubt on the taxonomic status of different populations of this species. This work, based on the observation, quantification and analysis of specific morphological characters in specimens collected at five different localities of South America and Antarctica, strongly indicates that there are two different species: C. eumyota from South America and Corella antarctica Sluiter, 1905) from Antarctica, which has been till now considered a junior synonym of the former. The species clearly differ in the arrangement of the gonadal ducts, the size of the larvae and the shape of the anus, among other characters. Morphological variation displays a defined, discrete grouping supporting a clear differentiation into two species. This result shows the need for careful inspection of specimens to avoid wrong interpretations in a context of changes of marine biota due to biological invasions.

Keywords

Ascidian Corella eumyota Corella antarctica Morphology Multivariate analysis South America Antarctica Invasions 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Gastón Alurralde
    • 1
    • 2
  • Luciana Torre
    • 3
  • Evangelina Schwindt
    • 4
  • Juan C. Castilla
    • 5
  • Marcos Tatián
    • 1
    • 3
  1. 1.Ecología Marina, Facultad de Ciencias Exactas, Físicas y NaturalesUniversidad Nacional de Córdoba (UNC)CórdobaArgentina
  2. 2.Museo Provincial de Ciencias Naturales “Dr. Arturo Umberto Illía”CórdobaArgentina
  3. 3.Instituto de Diversidad y Ecología Animal (IDEA)Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)/Universidad Nacional de Córdoba (UNC)CórdobaArgentina
  4. 4.Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)Centro Nacional Patagónico (CENPAT)Puerto MadrynArgentina
  5. 5.Núcleo Milenio de Conservación Marina, F. C. BiológicasP. Universidad Católica de ChileSantiagoChile

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