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[Bomepie]

Started a new fort on a barren embark. Upon realizing there was no wood or plants I immediately dug down searching for the caverns. I've colonized the first cavern but lost 3 dwarves off the bat to cave crocs and such. I was worried about colonizing an unfriendly cavern with just 4 dwarves left, but amazingly I've gotten 3 immigration waves before the first caravan even. I don't remember immigration happening off the bat like this, is this a new feature? Does .12 look at your population and send reinforcements if you're dying out?

[Man of Paper]

I have no idea what the method is, but I usually get migrants while having fun.

[Vercingetorix]

What's your fortress wealth?  My guess is you have a "curious structure" on your map that is artificially inflating your wealth.  This also has the unpleasant consequence of producing early ambushes in many cases.

If not...I don't know.  On normal maps I usually don't get a sizable migrant wave until the second year; I might get a trickle of a few dwarves during the summer/autumn, but nothing big until later on.

[Shagomir]

My last fort was pretty typical - by the spring of year two I had about 15 dwarves, then got hit by a migration wave of about 20. I always deconstruct the trade depot under the first dwarf caravan that arrives... it usually has a bunch of good stuff that I need right away, and it's easier than trying to trade for it, but that probably boosts my wealth a ton attracting the huge migrant waves.

[Man of Paper]

But I think that also reduces the migrant waves. I believe that the number of migrants has a loose correlation with the profit the dwarf traders turn.

Though I could be talking out of my ass.

[Shagomir]

But I think that also reduces the migrant waves. I believe that the number of migrants has a loose correlation with the profit the dwarf traders turn.

Though I could be talking out of my ass.

This is not really a problem. I am usually up to 50 dwarves by the time I'm 2-3 years into the game, and then I have enough dwarves to get a steel or bronze industry and some metal crafts going. I just try to get a ton of dwarfs quickly so I can start to form a military, and keep a 20~30-strong hauling/furnace-operating/part-time-mechanics crew going to move everything around and build the magma pumpstack and reactors.  Then I can start giving away masterwork gold statues and whatnot to the traders, who will happily ignore all the cargos I stole.

[Darkmere]

Even if I wasn't trading anything but paltry stone baubles (crap), it seemed to me that migrants get attracted by wealth. Wealth is partially determined by the area of your fortress, which relatively skyrockets when you breach a cavern.

I noticed the same behavior between year 1 and year 2, with no trading at all. Migrants during year 1, while establishing temporary hobbit hole fort: 0

Migrants during year 2, after excavation of multiple floors for real fort (but still no trading): 23 or so.

Also seems like once I have the fort expanded I'll get consistent migrant waves of more than 20 until it stabilizes at 130 or so.

[SkyRender]

 If migration can be influenced by wealth even when the Mountainhomes have no idea how much wealth you have, then that would explain why every fort I run ends up with a population of 100+ by year 3.  I am, shall we say, industrious.  To the point that I can usually buy out the first caravan easily, and tend to have an overall fortress wealth of over 7 million by year 4.  And I always, without fail, get a wave of 7 migrants late the first spring or early the first summer, then another wave in the fall, another in the next spring, and so on until my population approaches 100.

[FleshForge]

Trading does seem to have an impact on how many migrants you get, although I have no idea of the exact mechanic.  Waves 1 and 2, before the first traders come, are almost always 5 or less, but wave 3, after the first dwarven caravan comes, is always huge.  YMMV.

[Biag]

Immigration is indeed influenced by wealth, both created (which architecture plays into, ie surface area) and exported. I always have a Proficient Stonecrafter going as soon as I get stone, so I typically end up with enough dwarves for a mood by the time the caravan leaves. Exported wealth does seem to have a larger effect, since my population ALWAYS doubles in the spring. At least.

[Sphalerite]

In DF2010 it appears to be standard to get a few immigrant waves in the first year, before you've traded anything.  This happens even if your civilization is dead.  It doesn't seem to matter how well your fortress is doing or how many of your dwarves have died.

[melomel]

Lots of immigrants are standard.  I usually hit forty before summer or fall of the first year.

On the plus side, you can get useful migrants now.

[Feral23]

I enjoy dark tower embarks- but if not prepared, they get thirsty- the huge architectural wealth causes massive immigrations, like 20+

[Still Standing]

...And then sometimes you are insanely rich (20,000,000+ Dwarf Bucks) but aren't getting any migrants.  It's very strange.