Abstract
| Original language | English |
|---|---|
| Article number | e34363 |
| Pages (from-to) | 1-10 |
| Number of pages | 10 |
| Journal | PLoS ONE |
| Volume | 7 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 27 Mar 2012 |
| Externally published | Yes |
Cite this
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Genetic population structure in the Antarctic benthos : insights from the widespread amphipod, Orchomenella franklini. / Baird, Helena Phoenix; Miller, Karen Joy; Stark, Jonathan Sean.
In: PLoS ONE, Vol. 7, No. 3, e34363, 27.03.2012, p. 1-10.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Genetic population structure in the Antarctic benthos
T2 - insights from the widespread amphipod, Orchomenella franklini
AU - Baird, Helena Phoenix
AU - Miller, Karen Joy
AU - Stark, Jonathan Sean
PY - 2012/3/27
Y1 - 2012/3/27
N2 - Currently there is very limited understanding of genetic population structure in the Antarctic benthos. We conducted one of the first studies of microsatellite variation in an Antarctic benthic invertebrate, using the ubiquitous amphipod Orchomenella franklini (Walker, 1903). Seven microsatellite loci were used to assess genetic structure on three spatial scales: sites (100 s of metres), locations (1-10 kilometres) and regions (1000 s of kilometres) sampled in East Antarctica at Casey and Davis stations. Considerable genetic diversity was revealed, which varied between the two regions and also between polluted and unpolluted sites. Genetic differentiation among all populations was highly significant (F ST = 0.086, R ST = 0.139, pem≈1 suggesting insufficient gene flow to prevent independent evolution of the two regions, i.e., Casey and Davis are effectively isolated. Isolation by distance was detected at smaller scales and indicates that gene flow in O. franklini occurs primarily through stepping-stone dispersal. Three of the microsatellite loci showed signs of selection, providing evidence that localised adaptation may occur within the Antarctic benthos. These results provide insights into processes of speciation in Antarctic brooders, and will help inform the design of spatial management initiatives recently endorsed for the Antarctic benthos.
AB - Currently there is very limited understanding of genetic population structure in the Antarctic benthos. We conducted one of the first studies of microsatellite variation in an Antarctic benthic invertebrate, using the ubiquitous amphipod Orchomenella franklini (Walker, 1903). Seven microsatellite loci were used to assess genetic structure on three spatial scales: sites (100 s of metres), locations (1-10 kilometres) and regions (1000 s of kilometres) sampled in East Antarctica at Casey and Davis stations. Considerable genetic diversity was revealed, which varied between the two regions and also between polluted and unpolluted sites. Genetic differentiation among all populations was highly significant (F ST = 0.086, R ST = 0.139, pem≈1 suggesting insufficient gene flow to prevent independent evolution of the two regions, i.e., Casey and Davis are effectively isolated. Isolation by distance was detected at smaller scales and indicates that gene flow in O. franklini occurs primarily through stepping-stone dispersal. Three of the microsatellite loci showed signs of selection, providing evidence that localised adaptation may occur within the Antarctic benthos. These results provide insights into processes of speciation in Antarctic brooders, and will help inform the design of spatial management initiatives recently endorsed for the Antarctic benthos.
UR - http://www.scopus.com/inward/record.url?scp=84858994691&partnerID=8YFLogxK
U2 - 10.1371/journal.pone.0034363
DO - 10.1371/journal.pone.0034363
M3 - Article
VL - 7
SP - 1
EP - 10
JO - PLoS ONE
JF - PLoS ONE
SN - 1932-6203
IS - 3
M1 - e34363
ER -