PREMISE OF THE STUDY: American bipolar plant distributions characterize taxa at various taxonomic ranks but are most common in the bryophytes at infraspecific and infrageneric levels. A previous study on the bipolar disjunction in the dung moss genus Tetraplodon found that direct long-distance dispersal from North to South in the Miocene–Pleistocene accounted for the origin of the Southern American endemic Tetraplodon fuegianus, congruent with other molecular studies on bipolar bryophytes. The previous study, however, remained inconclusive regarding a specific northern hemisphere source region for the transequatorial dispersal event that gave rise to T. fuegianus. METHODS: To estimate spatial genetic structure and phylogeographic relationships within the bipolar lineage of Tetraplodon, which includes T. fuegianus, we analyzed thousands of restriction-site-associated DNA (RADseq) loci and single nucleotide polymorphisms using Bayesian individual assignment and maximum likelihood and coalescent model based phylogenetic approaches. KEY RESULTS: Northwestern North America is the most likely source of the recent ancestor to T. fuegianus. CONCLUSIONS: Tetraplodon fuegianus, which marks the southernmost populations in the bipolar lineage of Tetraplodon, arose following a single long-distance dispersal event involving a T. mnioides lineage that is now rare in the northern hemisphere and potentially restricted to the Pacific Northwest of North America. Furthermore, gene flow between sympatric lineages of Tetraplodon mnioides in the northern hemisphere is limited, possibly due to high rates of selfing or reproductive isolation.
View post tag: completes Back to overview,Home naval-today ConXtech Completes Structural Steel Erection at the Naval Base on North Island View post tag: North View post tag: Structural View post tag: Base February 11, 2011 View post tag: Erection ConXtech® Space Frame Systems has completed structural steel erection on a 152,000 gsf lodge for the US Navy at the Naval Base on North Isla…(prweb)[mappress]Source: prweb, February 11, 2011; Share this article View post tag: Naval View post tag: Island ConXtech Completes Structural Steel Erection at the Naval Base on North Island View post tag: Steel View post tag: ConXtech
Yeovil 2 Brentford 1Andy Williams netted an 87th-minute winner for Yeovil as they came from behind to beat Brentford at Huish Park.Sam Saunders celebrated his new contract by scoring his ninth goal of the season for the Bees.AdChoices广告But Williams scored twice in the second half to put a dent in the London club’s play-off hopes.Saunders, who agreed a one-year deal in midweek, showed his quality by creating an early chance for Clayton Donaldson, who fired wide.Brentford’s 25th-minute opener was a typical Saunders strike – a perfectly placed free-kick into the corner of the net.But, after Paul Huntington almost equalised when he headed over, Yeovil hit back with a long-range belter of their own.Williams controlled a long ball and squirmed away from Leon Legge and Adam Thompson before smashing beyond keeper Simon Moore, who played instead of Richard Lee.It was Williams’ sixth goal in as many games – and his seventh sent Uwe Rosler’s side home with nothing.The in-form striker pounced after hesitation by Legge and fellow defender Harlee Dean.It came after Brentford had a goal disallowed and strong appeals for a penalty waved away.Gary Alexander hit the net but Donaldson, who did not appear to be interfering with play, was in an offside position and the effort was ruled out.And Rosler’s men felt aggrieved again when Jonathan Douglas seemed to be impeded by Huntington as he attempted to meet Donaldson’s knock-down.Follow West London Sport on TwitterFind us on Facebook