Kochzius, M.

Paiz-Medina, L.

Open Marine Archive

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Genetic population structure of Euchaeta marina (Copepoda, 
Calanoida) in the eastern subtropical and tropical Atlantic Ocean 
Paiz-Medina Lucía and Marc Kochzius 
Marine Biology, Free University of Brussels (VUB), Pleinlaan 2, 1050 Brussels, Belgium 
E-mail: lucia.paiz.medina@vub.ac.be  
Copepods are a significant part of the zooplankton community, considered to be the most 
abundant metazoan group on the planet. Therefore, they are very important in the food web, 
linking primary productivity of phytoplankton to higher trophic levels (Gibbons, 1997). Even though 
copepods are considered to be a very well-known group, studies revealed cryptic species and 
hidden diversity by re-examining their morphology, especially in species that represented a 
challenge for identification to taxonomist (Bucklin et al., 2011). An example is Euchaeta marina in 
the Pacific Ocean, where a morphological study showed that it is co-distributed with a closely 
related species (Bradford, 1974). Phylogenetic studies have been conducted on deep-see copepods 
(Laakmann et al., 2012), but there is not much information about the genetic diversity of species 
from the euphotic zone. Considering the above mentioned, Euchaeta marina is a species of interest 
to study its genetic diversity in order to evaluate if cryptic sister-species also exist in the Atlantic. In 
the present study, the genetic diversity will be analysed by sequencing the mitochondrial 
cytochrome c oxidase subunit I gene (COI). During the R/V Polarstern cruise ANT XXIX/1 
(27 October to 27 November 2012), 455 samples were collected from 11 different locations in the 
eastern subtropical and tropical Atlantic Ocean. This study aims to evaluate the genetic population 
structure of Euchaeta marina in the eastern Atlantic Ocean. 
 
 
References 
Bradford J.M. 1974. Euchaeta marina (Prestandrea) (Copepoda, Calanoida) and two closely related 
new species from the Pacific. Pacific Science 28:159-169. 
Bucklin A., D. Steinke and L. Blanco-Bercial. 2011. DNA barcoding of marine metazoa. Annual 
Review of Marine Science 3:471-508. 
Gibbons M.J. 1997. An introduction to the zooplankton of the Benguela current region. 25p. 
Laakmann S., H. Auel and M. Kochzius. 2012. Evolution in the deep sea: biological traits, ecology 
and phylogenetics of pelagic copepods. Molecular Phylogenetics and Evolution 65:535–546. 


Genetic population structure of <i>Euchaeta marina</i> (Copepoda, Calanoida) in the eastern subtropical and tropical Atlantic Ocean

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