It's well worth being a member of the FBA. The association promotes freshwater science and its Ambleside HQ in Cumbria houses one of the finest freshwater research libraries in the world.

The last volume of the in-house magazine, Freshwater Forum, had an interesting research article on a 7 year study of the mayfly, Ephemera danica, by C Bennett, which concluded that the mayfly can complete its life-cycle in a single year, rather than the commonly supposed 2 years. Lab studies show that this is possible for the stonefly too. If global warming does contribute to shortened life-cycles due to increased water temperatures then this might make fly populations more vulnerable to adverse weather conditions during the critical emergent period, as more of the population in a one-year cycle would be exposed, with fewer flies being in a two-year gene reservoir. Ephemera danica is more likely to be at greater risk compared to some of the Olives, for example, because the mayfly seems to have a shorter emerging period.