|Copyright: Ersin UYANIK (eruyanik)
|Date Taken: 2006-02-05|
|Camera: Canon Powershot A610|
|Exposure: f/4, 1/160 seconds|
|More Photo Info: [view]|
|Photo Version: Original Version|
|Date Submitted: 2006-03-15 4:48|
|[Note Guidelines] Photographer's Note|
|I met this winter stonefly at hiking in Pamukova, Sakarya.|
Stoneflies are univoltine, i.e., having a single generation per year. Adults emerge in late winter and early spring; they mate and the females deposit their eggs in the water. Hilsenhoff (1995) fills in the details of the life cycle: "Larvae hatch from eggs almost immediately, feed briefly, and then burrow into the substrate where they spend the late spring and summer in diapause [a state of suspended growth and development typical of many insects, CG]. Mummy-like diapausing larvae resume a normal appearance in September and commence feeding . . ." Ongoing inventory work suggests that the earliest the larvae appear in the Kinnickinnic is late November, and regular collecting from that point on indicates growth toward maturity through the winter months. (The latest I have collected the larvae from the Kinni is the 20th of March.) Then a real treat is in store on just the right days [those with a combined optimal temperature and day length (Hynes 1976)] in February and March, when the small, dark adults emerge onto the surface of the snow! I know of no observer, including most aquatic entomologists, whose excitement is hidden when talking about these little winter emergers.
Notes are from http://www.lambcom.net/kiaptuwish/clarks_bugs/bugs_stonefly.html
Only registered TrekNature members may rate photo notes.