[OANNES Foro] Population genetic analyses reveal distinct geographical blooms of a jellyfish

[Mario Cabrejos]

Biological Journal of the Linnean Society

 <http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1095-8312/earlyview>
Early View (Online Version of Record published before inclusion in an issue)

Article first published online: 27 JUN 2015

DOI: 10.1111/bij.12614


 


 


Population genetic analyses reveal distinct geographical blooms of the
jellyfish Rhizostoma octopus (Scyphozoa)


1.     Fergal Glynn1,2, Jonathan D. R. Houghton1,2,3 and Jim Provan1,2,*

1 School of Biological Sciences, Queen's University Belfast, Belfast, UK 2
Institute for Global Food Security, Queen's University Belfast, Belfast, UK
3 Queen's Marine Laboratory, 12-13 The Strand, Portaferry, UK.
*Corresponding author. E-mail:  <mailto:j.provan en qub.ac.uk>
j.provan en qub.ac.uk

 

·         Abstract

Understanding the spatial integrity and connectivity of jellyfish blooms is
important for ecologists and coastal stakeholders alike. Previous studies
have shown that the distribution of jellyfish blooms can display a marked
consistency in space and time, suggesting that such patterns cannot be
attributed to passive processes alone. In the present study, we used a
combination of microsatellite markers and mitochondrial cytochrome oxidase I
sequences to investigate genetic structuring of the scyphozoan jellyfish
Rhizostoma octopus in the Irish and Celtic Seas. The mitochondrial data
indicated far higher levels of population differentiation than the
microsatellites: ΦST[MT] = 0.300 vs. ΦST[NUC] = 0.013. Simulation studies
indicated that the low levels of nuclear differentiation were not the result
of limited power because of low levels of polymorphism. These findings,
supported by palaeodistribution modelling and mismatch distribution
analysis, are consistent with expansion of R. octopus from a single, limited
refugium after the Last Glacial Maximum, followed by subsequent isolation,
and that the discrepancy between the mitochondrial and nuclear markers is a
result of the nuclear loci taking longer to reach mutation-drift equilibrium
following the expansion as a result of their four-fold larger effective
population size. The populations studied are probably not well connected via
gene flow, and thus genetically as well as geographically distinct, although
our findings also highlight the need to use a combination of organellar and
nuclear markers to enable a more complete understanding of population
demography and structure, particularly for species with large effective
population sizes.

 



---
This email is free from viruses and malware because avast! Antivirus protection is active.
https://www.avast.com/antivirus
------------ pr?xima parte ------------
Se ha borrado un adjunto en formato HTML...
URL: <http://lista.oannes.org.pe/pipermail/oannes-oannes.org.pe/attachments/20150701/3c4f3476/attachment.htm>