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Table 2 Mean density (ind/m 2 ), range, and functional feeding groups of the 27 caddisfly taxa

From: Biological traits and community patterns of Trichoptera at two Patagonian headwater streams affected by volcanic ash deposition

  FFG Nant y Fall Chiquito
  Pre-eruption Post-eruption Pre-eruption Post-eruption
Glossosomatidae      
Mastigoptila longicornuta (Schmid 1958) Scr 51 (0 to 388) 33 (0 to 137)   
Scotiotrichia ocreata (Mosely 1934) Scr    248 (0 to 488) 20 (0 to 89)
Helicophidae      
Austrocentrus valgiformis Flint 1997 Scr    18 (0 to 44) 7 (0 to 15)
Eosericostoma aequispina Schmid 1955 Scr    61 (4 to 207) 2 (0 to 15)
Hydrobiosidae      
Cailloma pumida Ross 1956 P 1 (0 to 7) 1 (0 to 4) 6 (0 to 33) 1 (0 to 4)
Metachorema griseum Schmid 1957 P   11 (0 to 30)   
Neoatopsyche brevispina Schmid 1957 P 47 (0-163) 52 (0 to 178) 50 (7 to 129) 23 (15 to 33)
Neoatopsyche unispina Flint 1967 P 20 (0 to 55) 10 (0 to 41) 1 (0 to 7) 1 (0 to 4)
Neopsilochorema tricarinatum Schmid 1955 P 28 (0 to 85) 23 (4 to 33) 3 (0 to 7) 1 (0 to 7)
Rheochorema lobuliferum Flint 1967 P 2 (0 to 11)    
Rheochorema robustum Schmid 1955 P    3 (0 to 11) 2 (0 to 7)
Rheochorema tenuispinum Schmid 1955 P    8 (0 to 18) 4 (0 to 7)
Hydropsychidae      
Smicridea annulicornis (Blanchard 1851) CF 135 (7 to 703) 108 (15 to 259) 64 (0 to 429) 11 (4 to 30)
Smicridea frequens (Navás 1930) CF 1,187 (48 to 4,755) 1,751 (163 to 4,518) 6 (0 to 19)  
Hydroptilidae      
Oxyethira bidentata Mosely 1934 AP 3 (0 to 30) 2 (0 to 7)   
Hydroptilidae sp. A Scr 2 (0 to 15) 2 (0 to 15)   
Metrichia patagonica (Flint 1983) Scr    22 (4 to 59)  
Metrichia neotropicalis Schmid 1958 Scr    13 (0 to 63)  
Leptoceridae      
Brachysetodes quadrifidus Schmid 1955 SH 155 (18 to 396) 27 (0 to 55) 139 (18 to 314) 17 (0 to 67)
Hudsonema flaminii (Navás 1936) SH 2 (0 to 7)    1 (0 to 4)
Limnephilidae      
Monocosmoecus sp. SH 10 (0 to 52)   5 (0 to 18) 4 (0 to 18)
Verger sp. SH 11 (0 to 67)    
Philorheithridae      
Psilopsyche molinai Navás 1926 P 2 (0 to 7)   6 (0 to 22) 1 (0 to 4)
Polycentropodidae      
Polycentropus sp. P     1 (0 to 4)
Sericostomatidae      
Myotrichia murina Schmid 1955 SH    329 (22 to 858) 102 (30 to 226)
Parasericostoma cristatum Flint 1983 SH     7 (0 to 26)
Parasericostoma ovale (Schmid 1955) SH 3,916 (2,546 to 8,688) 2,072 (674 to 4,177)   
Richness   8 (6 to10) 6 (4 to 8) 8 (5 to 10) 5 (2 to 8)
Density   5,573 (3,015 to 14,230) 4,094 (1,140 to 8,998) 984 (196 to 2,012) 204 (67 to 377)
Shannon diversity   0.78 (0.6 to 1) 1 (0.8 to 1.3) 1.5 (1.2 to 1.7) 1.2 (1 to 1.4)
  1. Recorded at pre and post-eruption dates for Nant y Fall and Chiquito Streams (Patagonia, Argentina). Mean values and range of the total density, species richness, and Shannon diversity are summarized for both study periods; Scr, scraper; P, predator; CF, collector-filterer; AP, algal piercer; SH, shredder.