Silver Argiope Females: variation among individuals

What’s this bug?
I took the attached picture of a spider in Fallbrook, California in some sort of cactus tree. I’ve not been able to find out what type of spider this is, and I’m very curious. I’ve attached another pic of what looks to be the same type of spider, only with different colors; male/female thing?
Thank you!!!

Hi Aaron,
Both of your photos are of female Silver Argiopes, Argiope argentata. There is often a degree of variation within the species. This is a common southern spider that ranges to California.

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