2024-03-29T12:29:37Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/886452021-12-28T16:13:27Zcom_10261_13com_10261_8com_10261_94col_10261_266col_10261_347
00925njm 22002777a 4500
dc
Muñoz, Joaquín
author
Amat, Francisco
author
Green, Andy J.
author
Figuerola, Jordi
author
Gómez, África
author
2013
Since Darwin’s time, waterbirds have been considered an important vector for the
dispersal of continental aquatic invertebrates. Bird movements have facilitated the
worldwide invasion of the American brine shrimp Artemia franciscana, transporting
cysts (diapausing eggs), and favouring rapid range expansions from introduction
sites.Here we address the impact of bird migratory flyways on the population genetic
structure and phylogeography of A. franciscana in its native range in the Americas.
We examined sequence variation for two mitochondrial gene fragments (COI and
16S for a subset of the data) in a large set of population samples representing the
entire native range of A. franciscana. Furthermore, we performed Mantel tests and
redundancy analyses (RDA) to test the role of flyways, geography and human introductions
on the phylogeography and population genetic structure at a continental
scale. A. franciscana mitochondrial DNA was very diverse, with two main clades,
largely corresponding to Pacific and Atlantic populations, mirroring American bird
flyways. There was a high degree of regional endemism, with populations subdivided
into at least 12 divergent, geographically restricted and largely allopatric mitochondrial
lineages, and high levels of population structure (8ST of 0.92), indicating low
ongoing gene flow. We found evidence of human-mediated introductions in nine
out of 39 populations analysed. Once these populations were removed,Mantel tests
revealed a strong association between genetic variation and geographic distance
(i.e., isolation-by-distance pattern). RDA showed that shared bird flyways explained
around 20% of the variance in genetic distance between populations and this was
highly significant, once geographic distance was controlled for. The variance explained
increased to 30% when the factor human introduction was included in the
model. Our findings suggest that bird-mediated transport of brine shrimp propagules
does not result in substantial ongoing gene flow; instead, it had a significant
historical role on the current species phylogeography, facilitating the colonisation
of new aquatic environments as they become available along their main migratory
flyways.
Peer J. (2013)
http://hdl.handle.net/10261/88645
10.7717/peerj.200
24255814
Bird migration
Passive dispersal
Migratory flyways
Continental colonization
16S rDNA
COI
Isolation by distance
Bird migratory flyways influence the phylogeography of the invasive brine shrimp Artemia franciscana in its native American range