「～によって」は英語でどう言う？「depend on」の使い方

A few weeks ago, somebody was telling me about Japanese pickles. They told me:

× The flavor is different by each prefecture.
◯ The flavor is different in each prefecture.
◯ The flavor differs according to the prefecture.
◯ The flavor depends on the prefecture.

• depend on ～によって決まる、～次第｛しだい｝である

That last pattern is really useful! Take a look:

• _(n/noun phrase)_ depends on _(n/noun phrase)_

You probably know I like chocolate by reading my blog, which has posts like this one:

• http://upgradeenglish.blogspot.com/2010/05/3.html

This is some dark chocolate that I was eating the other day. It's a bit sweeter than I like, but the flavor was really rich.

• rich flavor 《a ～》豊かな風味 (definition from Eijiro on the Web)

Dark chocolate is one of my favorite things to eat. I should learn more about why dark chocolates can taste so different. What factors does the flavor depend on?

• factor 因子, ファクター, 因 (definition from jmdict)

If I were a rich man, I'd sample a different kind of dark chocolate every day. Right now, the kinds of chocolate I eat depend on what people give me. I seldom have the time to wander around the basement of a department store sampling chocolate. Some day...