Currently, you need to be a member of Bluesky to view anything on it. That will probably change at some point, but right now, this will only be relevant to people who are on Bluesky
The libre network Mastodon already has a nice community of researchers and naturalists as well. I enjoy following this automated account there: # @biodiversitypix@botsin.space
In the settings, you can change your preference to black text on light background. It’s not individual accounts, it’s the preferences that you set on your end.