Table 4. Taxonomic composition and 

 collected by Ponar grab. 



relative abundance of macrozoobenthos 



Pet Composition 



Taxon 



Pet Composition 



Hydra 





0.3 



Rhabdocoela 





0.7 



Tricladida 





0.1 



Kematoda 





0.7 



Hirudinea 





0.1 



Oligochaeta 





71.3 



Manayunkia speciosa 



<0.1 



Ostracoda 





2.0 



Gamma r us 





0.3 



Pontoporeia 



hoyi 



0.5 



Hyalella azteca 



0.2 



Argulus 





<0.1 



Chironomidae 





21.3 



Ceratopogoni 



dae 



<0.1 



Empididae 





<0.1 



Tipulidae 





<0.1 



Caenis 





0.6 



Hexagenia 





<0.1 



Stenonema 





<0.1 



Elmidae 





<0.1 



Polycentropus 



Leptoceridae 



Oecetis 



Mystacides 



Ceraclea 



Hydroptila 



Molanna 



0.3 

 <0.1 



0.1 

 <0.1 

 <0.1 

 <0.1 

 <0.1 

 <0.1 



Cheumatopsyche 



Unidentified Trichoptera <0.1 



Corixidae 



Plecoptera 



Acarina 



Ancylidae 



Lymnaea 



Physa 



Gyraulus 



Amnicola 



0.4 

 <0.1 



0.5 

 <0.1 

 <0.1 

 <0.1 

 <0.1 



0.1 



Unidentified Gastropoda <0.1 

 Pisidium 0.4 



Unidentified Sphaeriidae 0.2 



19 



