Freshwater environments have the potential to be impacted by acidification due to increases in dissolved carbon dioxide (CO2). Recent work in the marine environment suggests that increased CO2 levels due to climate change can negatively affect a fish’s ability to detect predators, home to natal environments, and perform aerobically. The potential for elevated CO2 to have similar negative impacts on freshwater communities remains understudied. The objective of our study was to quantify the effects of elevated CO2 on the behaviors of fathead minnows (Pimephales promelas) and silver carp (Hypophthalmichthys molitrix) following exposure to conspecific skin extracts (alarm cues). In fathead minnows, their response to conspecific skin extracts were significantly impaired following exposure to elevated CO2 levels for at least 96 h, while silver carp behaviors were unaltered. However, fathead minnow behaviors did return to pre-CO2 exposure in high CO2 exposed fish following 14 d of holding at ambient CO2 levels. Overall, this study suggests there may be potential impacts to freshwater fishes alarm cue behaviors following CO2 exposure but these responses may be species-specific, and will likely be abated should the CO2 stressor be removed. ; Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2018-05-01 ; The student, John Tix, accepted the attached license on 2016-04-19 at 07:51. ; The student, John Tix, submitted this Thesis for approval on 2016-04-19 at 07:57. ; This Thesis was approved for publication on 2016-04-19 at 14:24. ; DSpace SAF Submission Ingestion Package generated from Vireo submission #9328 on 2016-07-07 at 13:50:03 ; Made available in DSpace on 2016-07-07T20:27:42Z (GMT). No. of bitstreams: 2 TIX-THESIS-2016.pdf: 1391244 bytes, checksum: 6ef6487b60b102ae9ace7338e07dde79 (MD5) LICENSE.txt: 4205 bytes, checksum: f9d7e65212423a879502f68c0ffd52b5 (MD5) Previous issue date: 2016-04-19 ; Embargo set by: Seth Robbins for item 93141 Lift date: 2018-07-07T20:28:14Z ...