For many people, observing the cycles of nature as they respond to the changing seasons brings great joy. Observing seasonal events also keeps us in tune with nature. We have compiled Biodiversity Ireland’s most notable yearly seasonal events. Would you agree?

Mayfly hatch

Mayfly hatch
The emergence of the Mayfly helps mark the transition from spring to summer, and is an eagerly anticipated event for many fishermen. The larvae spend two years growing on the bottom of suitable lakes and rivers, before rising to the surface to spend only a few days as the winged insect we know as the Mayfly. The adults don’t have mouth parts and can’t eat – their only priority is to mate and start a new generation. Before dying, the female drops back to the water surface and deposits up to eight thousand slow sinking eggs to begin the cycle again (Photograph: Jan-Robert Baars).