Deglaciation helped kelp

[Ian Thomas]

Pleistocene coasts had few kelp beds? Interesting. They're a feature of temperate coasts today.

Kelp underwent a range expansion post deglaciation.

Phylogeographic data revealed shallow genetic structure in the kelp Saccharina japonica (Laminariales, Phaeophyta)
BMC Evolutionary Biology 2015, 15:237 doi:10.1186/s12862-015-0517-8
Published: 2 November 2015
www.biomedcentral.com/1471-2148/15/237/abstract

[Isengard]

All changes of climate/environment presumably shift the balance from one species to another.