The technique we used was a form of stream-dipping called kick-sampling (see left) which requires you to plant your feet and a collecting net on the stream-bed and shuffle your boots about to dislodge the livestock, which will get swept down current into the net. We brought four broad 60 x 50 x 10cm white plastic trays to empty the catch into and were able to carry out a preliminary (!positive!) assessment of the water quality by finding caddis-fly (Trichoptera) and mayfly larvae, (often Rhithrogena semicolorata or Ecdyonurus venosus). The common names for Mayflies - there are 33 different species native to Ireland - sound, for obvious reasons, like the things fly-fishermen make out of silk and wire: Large Green Dun, Angler's Curse, Pond Olive, Dusky Yellowstreak etc. In many European languages Mayflies are named for their ephemeral nature, (they often become adult, mate and die in a single 24hrs period): German Eintagsfliege, Dutch eendagsvlieg, Slovenian enodnevnica, Swedish dagslända, Danish and Norwegian døgnflue, Polish jętka jednodniówka, Latvian viendienītes, Finnish päivänkorento, Hebrew בַּריוֹם, Turkish birgün sineği, Russian подёнка, Ukrainian поденка, Bulgarian еднодневка, and Greek εφήμερος. The Greek name, transliterated ephḗmeros (Modern Greek: [eˈfimeɾos]), is the origin of the names in Romance languages: French éphémère, Italian effimera, Portuguese efêmera, Spanish efímera, and Romanian efemeride. The EnvChems spend part of the afternoon identifying the small creatures they had caught using a dichotomous key.
|met.ie rainfall radar 07/04/14|