Yep, as with many (but not all) species of spiders, the male Argiope (aka Garden or Zipper Spider) is smaller & much less obvious than his female counterpart. Male tarantulas are smaller too. They only live a few years. Our female tarantula lived into her 20's!
Unfortunately, Argiopes are preyed upon by wasps, such as the Tarantula Hawk & Spider Wasp. (I suspect other types of wasps prey on spiders too.) I think birds probably prey on them too.
According to the Nat'l Audubon Field Guide, male Argiopes are smaller & they build their webs in an outlying part of the females web. The female dies after she's filled her egg sac. The eggs hatch in autumn, but over-winter in the sac. However, I have found empty egg sacs near where an Argiope had a web. Unfortunately, the Argiope had been killed by one of those wasps. I saw the whole thing unfold here in my backyard. We tried to save the spider. (chased the wasp off & put the spider in a safe place where she might crawl away if she got over the wasp venom, but she didn't. Kinda sad.
)
Nothing ever hatched out of her egg sac. I think she built it and never got the chance to fill it.
We had a bunch of Argiopes in greenhouses where I used to work. They were the biggest ones I'd ever seen. So big, we could
feed them grasshoppers & they'd eat them. There was at least 2 spiders in each
greenhouse, 1 at each end. They had a pretty cushy life in a climate controlled environment. Between that & us feeding them, they got to be giants.
Here is a pic of an Argiope at the barn. She just vanished from the web one day; had been there for weeks. Built her web between a potted hibiscus & the non-sliding glass part of a sliding glass door. Managed to keep everyone, the dogs, kids, etc. from disturbing her, but then...she was gone. It was a bummer too, because she had a male hanging with her, but hadn't gotten around to making an egg sac yet. Sometimes, it's a hard world for the little things.