Listservs in the ecological sciences
ECOLOG-L. Biggest listserv in ecology, associated with the Ecological Society of America, currently with over 18,000 subscribers (as of September 2014). The listserv postings are also posted on a Twitter account.
EvolDir. The EvolDir ("Evolution Directory") is directed toward evolutionary biologists, population biologists and scientists in related areas. The listserv postings are also posted on a Twitter account.
Ecodiff. Listserv for ecology and evolution hosted by the French Ecological Society (SFE). Post mainly in French, but also English. Over 7000 subscribers (January 2014).