Necturus lewisi Study: Distribution & Ecology 25 



Table 8. Contents of stomachs from 36 larval Necturus lewisi (20-50 mm SVL). 

 NF = number of food items. % = percentage of total number of food 

 items. 



Food category NF % 



Annelida 



Oligochaeta (earthworms) 2 1.0 



Arthropoda 



Crustacea 



Cladocera 



Ostracoda (Cypridae) 

 Copepoda (Cyclopidae) 

 Isopoda 

 Amphipoda 



Insecta 



Collembola 



Odonata 



Ephemeroptera 



Plecoptera 



Trichoptera 



Diptera* 



Coleoptera (Dytiscidae) 



unidentified insects 



Totals 197 100.0 



* See Table 9 for Diptera families. 



Table 9. Diptera families found in digestive tracts of larval and adult Necturus 

 lewisi. NF = number of food items. % = percentage of the total number 

 of food items for each group. 



5 



2.5 



24 



12.2 



39 



19.8 



10 



5.1 



5 



2.5 



1 



0.5 



3 



1.5 



21 



10.7 



3 



1.5 



10 



5.1 



54 



27.4 



17 



8.6 



3 



1.5 



Diptera families 





Necturus lewisi 







Larvae 



Adults 





(20-50 



mm SVL) 



(91-173 



mm 



SVL) 



NF 



% 



NF 





% 



13 



6.6 





- 





12 



6.1 



1 





0.1 



26 



13.2 



1 





0.1 



3 



1.5 



101 





7.0 





- 



11 





0.8 





- 



2 





0.1 





- 



29 





2.0 



Simuliidae 



Ceratopogonidae 



Tendipedidae 



Tipulidae 



Chironomidae 



Tabanidae 



unidentified 



Totals 54 27.4% 145 10.1% 



