Are these sentences gramatically correct?

[sergtab]

Please tell me, are these sentences gramatically correct? Thank you!
It was established that some peculiarities of macrorelief such as ground water depth can influence the nematode fauna. On territories with high ground water depth, quantities of bacterivore nematodes were greater than average.

[bhaisahab]

It was established that some peculiarities of macrorelief, such as ground water depth, can influence the nematode fauna. On territories with high ground water depth, quantities of bacterivore nematodes were greater than average.

Perfectly correct grammatically, I have just added two commas in the first sentence.