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<br /> 30 Jul. 1998 20 Aug. 1998 3 Sept. 1998 8 Oct. 1998 <br />Microcylloepus sp. 1.3 0.8 <br />Dytiscidae 0.2 0.3 <br />Ochthebius Iineatus 1.0 <br />Ophiogomphus saverus 0.3 1.7 0.3 <br />Corixidae 1.2 0.3 0.2 <br />Ambrysu5 morman 0.2 <br />Rhagovelia sp. 0.8 <br />Ancylidae 0.7 <br />Physa sp. 0.2 <br />Pisidium sp. 0.2 <br />Oligochaela 0.5 <br />Tolals 78.7 87.7 394.0 97.3 <br /> <br />I <br />I <br />I <br />I <br /> <br />Duffy Tunnel 23 Jul. 1998 20 Aug. 1998 3 Sept. 1998 8 Oct. 1998 <br /> Mean Mean Mean Mean <br />Acentrella insignificans 1.5 0.7 0.3 <br />Plaudftus virilis 0.3 <br />Camalobaetidius warreni 0.3 4.0 2.5 <br />Acerpanna pygmaea 0.3 0.2 <br />Baatis sp. 13.5 13.2 22.0 15.5 <br />Ephamerella sp. 5.7 55.8 <br />Sarretella sp. 8.3 0.2 <br />Heptagania sp. 0.7 0.2 2.7 3.0 <br />Rhfthrogena sp. 0.5 3.0 26.8 59.0 <br />Chorotarpes albiannulata 0.8 5.8 1.7 <br />Para/aptophlabia sp. 9.5 <br />Travere//a albartana 0.2 <br />Ama/atus sp. 0.2 0.3 <br />Tricorythodas corpulantus 1.7 10.8 2.3 <br />Tricorythodes minutus 4.7 20.0 4.2 4.0 <br />Capnia sp. 0.5 <br />Claassania sabulosa 0.2 1.0 1.3 0.7 <br />Isoganoldas sp. 0.3 1.7 3.2 0.8 <br />Isoparta sp. 1.8 <br />Brachycentrus occldantalis 0.2 0.2 <br />Culoptila cantha 1.2 11.3 8.0 0.5 <br />Protoptila arotica 8.8 29.2 47.0 <br />Halicopsycha borealis 0.3 <br />Chaumatopsycha sp. 0.5 57.5 68.2 46.5 <br />Hydropsycha cockarelli 5.2 3.5 8.5 1.7 <br />Hydropsycha occidentalis 1.0 3.0 0.7 2.8 <br />Hydropsycha oslari 2.2 63.2 70.0 36.8 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Table A2.3. Mean number of invertebrates collected from six surber <br />samples at Duffy surveyed site in July, August, September <br />and October 1998. <br /> <br />I <br /> <br />I <br /> <br />I <br />I <br /> <br />I <br /> <br />I <br />I <br /> <br />36 <br />