prey stage habitat number amphipods adult littoral 29 chironomids adult littoral 69 mayflies adult littoral 9 ostracods adult littoral 10 amphipods juvenile littoral 19 chironomids juvenile littoral 43 mayflies juvenile littoral 4 ostracods juvenile littoral 6 amphipods adult pelagic 6 chironomids adult pelagic 21 mayflies adult pelagic 6 ostracods adult pelagic 4 amphipods juvenile pelagic 1 chironomids juvenile pelagic 8 mayflies juvenile pelagic 5 ostracods juvenile pelagic 4