od ▁size ▁is ▁correl ated ▁with ▁female ▁length ▁and ▁ranges ▁from ▁ 6 ▁to ▁ 7 0 ▁emb ry os ▁per ▁individual . ▁ ▁Imp act ▁as ▁an ▁invas ive ▁species ▁Given ▁the ▁species ' ▁very ▁recent ▁introduction ▁into ▁the ▁Great ▁L akes , ▁its ▁impact ▁is ▁yet ▁to ▁be ▁established . ▁It ▁is ▁not ▁expected ▁to ▁comp ete ▁with ▁the ▁native ▁M . ▁re lic ta , ▁as ▁it ▁pre fers ▁the ▁cold ▁water ▁environments ▁below ▁the ▁la kes ' ▁therm oc line , ▁while ▁H . ▁anom ala ▁is ▁best ▁adapted ▁to ▁war mer ▁conditions . ▁In ▁Europe , ▁the ▁species ▁has ▁been ▁observed ▁to ▁dis rupt ▁food ▁web s ▁and ▁alter ▁nut ri ent ▁and ▁cont amin ant ▁cycles ▁of ▁environments ▁into ▁which ▁it ▁was ▁introduced . ▁The ▁my s id ▁has ▁been ▁associated ▁with ▁reduction ▁of ▁zo op l ank ton ▁bi om ass ▁and ▁b iod iversity , ▁while ▁having ▁an ▁opposite ▁effect ▁on ▁ph y top l ank ton . ▁Pel ag ic ▁fish ▁in ▁many ▁e cos ystem s ▁have ▁been ▁neg atively ▁affected ▁by ▁the ▁species ' ▁introduction ; ▁however , ▁sal mon ids ▁and ▁b enth ic ▁fish ▁seem ▁to ▁benefit ▁from ▁the ▁new ▁food ▁source . ▁The ▁species ' ▁routine ▁vertical ▁migration ▁through ▁the ▁water ▁column ▁results ▁in ▁continuous ▁cy cling ▁of ▁poll ut ants , ▁such ▁as ▁heavy ▁met als , ▁that ▁would ▁otherwise ▁be ▁conf ined ▁to ▁the ▁b enth ic ▁zone . ▁ ▁References ▁ ▁External ▁links ▁ ▁GL AN