In effect

[piggy386]

In cold-water habitats, certain invertebrates and fish convert starches into complex carbohydrates called glycerols, in effect manufacturing its own antifreeze.

Hi, can someone tell me whether "in effect" is served as noun on the above sentence?
If it's a noun, does this mean "in fact" or "in practice"? And manufacturing modifies the noun?

Thanks.

[Temico]

"In effect" is a phrase which means "in practice". In this sentence it is used as the adverb "practically" e.g.

"In cold-water habitats, certain invertebrates and fish convert starches into complex carbohydrates called glycerols, (which is)practically manufacturing its own antifreeze."