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Only a very small proportion of the seaweed flora of the Subarctic Region is Arctic in origin (5 m), however, European Boreal species are only 22–25% of the macrophyte biomass. Several different statistical approaches applied to the macrophyte data demonstrate the strength of these findings, while also finding that a subset of Subarctic species persists in deeper water to the south in the transition zone (i.e., southwestern Nova Scotia, Gulf of Maine). Based on graphic demonstration, this Subarctic Region is radically different from that of Nova Scotia and the Gulf of Maine, and its dominant species derive from the North Pacific Ocean. In its location and marine climate, this coast closely matches the Subarctic Region predicted by the TM. Lawrence, northeastern Newfoundland, and southern Labrador) that is centered on the Strait of Belle Isle has a unique assemblage of seaweeds. We demonstrate with the biomass data that a 3000-km stretch of coast (i.e., northern Gulf of St. Comparisons of European seaweed assemblages were accomplished by re-analyzing semi-quantitative data available in the literature.

A permanent record of these studies is provided by archived underwater photography and voucher herbarium samples, including tissue in silica gel to support future DNA analyses.

Meter-square quadrats were taken at each station, followed by at-sea sorting, identification, and weighing of biomass by species.

Seaweed assemblages were studied at 51 primary SCUBA stations with 4–7 standard depth zones at each station from southern Labrador to Cape Elizabeth, ME. The predictions of the TM were earlier supported with coralline algal abundances, and here are supported by a test with macrophyte assemblages. In contrast, Nova Scotia and the Gulf of Maine were found to be a Boreal/Subarctic transition zone. The TM predicted a new western North Atlantic Subarctic Region, centered on the Strait of Belle Isle and lying between Newfoundland and Labrador.

An earlier study with the TM predicted 20 of 24 classical biogeographic regions the 4 omitted regions were either weak, disputed, or structurally (sandy/silty regions) inapplicable to the TM. The TM uses coastal area and seawater temperature over Pleistocene time to reveal long-term climate/ area clusters that predict biogeographic regions. Quantitative analysis of North Atlantic macrophyte (seaweed) abundance was used to test the thermogeographic model (TM) of marine biogeography.

Instal the last version for windows VX Search Pro / Enterprise 15.5.12