caa a22 4500 606228195 CHVBK 20210128101202.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s10641-014-0292-1 doi (NATIONALLICENCE)springer-10.1007/s10641-014-0292-1 Juvenile and adult hardhead Mylopharodon conocephalus oxygen consumption rates: effects of temperature and swimming velocity [Elektronische Daten] [Nann Fangue, Dennis Cocherell, Felipe La Luz, Joseph Cech Jr., Lisa Thompson] California's populations of hardhead Mylopharodon conocephalus, a species of special concern, have declined, possibly due to dam construction with consequent temperature and water-velocity changes, and the introduction of non-native species. Environmental temperature effects on this large (to 60cm SL) cyprinid, and its swimming abilities, are not well known. To address these deficiencies and to assist conservation efforts, we measured resting and swimming metabolic rates of adult and juvenile hardhead acclimated to four temperatures (11, 16, 21, or 25°C). Resting metabolic rates (RMR, mg O2 kg−0.79h−1) generally increased with acclimation temperature, in adults and juveniles, with low to moderate thermal sensitivity (Q10 range: 1.33-2.04). Swimming metabolic rates, in Brett-style respirometers, of adults ranged from 209 to 1342mg O2 kg−1h−1 at velocities from 30 to 90cms−1, and juveniles ranged from 393 to 769mg O2 kg−1h−1 from 10 to 50cms−1. Adults were lethargic at 11°C and juveniles frequently refused to swim at 11 and 16°C, but all fish swam well at 21 and 25°C. These results suggest that hardhead are well-suited for sustained aerobic activity over a range of flow velocities, at moderate temperatures (ca. 16 to 21°C). However, juveniles, emerging in spring, may not be able to perform in cold water and/or high flow velocities, providing a caution to dam managers and regulators to avoid spring and summer operations whereby juveniles experience conditions outside of those occurring in unregulated rivers. Springer Science+Business Media Dordrecht, 2014 Hardhead minnow nationallicence Pulsed flows nationallicence Mylopharodon conocephalus nationallicence Temperature nationallicence Sustained and resting metabolic rates nationallicence Fangue Nann Department of Wildlife, Fish, and Conservation Biology, University of California Davis, One Shields Avenue, 95616, Davis, CA, USA aut Cocherell Dennis Department of Wildlife, Fish, and Conservation Biology, University of California Davis, One Shields Avenue, 95616, Davis, CA, USA aut La Luz Felipe Department of Wildlife, Fish, and Conservation Biology, University of California Davis, One Shields Avenue, 95616, Davis, CA, USA aut Cech Jr. Joseph Department of Wildlife, Fish, and Conservation Biology, University of California Davis, One Shields Avenue, 95616, Davis, CA, USA aut Thompson Lisa Department of Wildlife, Fish, and Conservation Biology, University of California Davis, One Shields Avenue, 95616, Davis, CA, USA aut Environmental Biology of Fishes Springer Netherlands 98/2(2015-02-01), 585-596 0378-1909 98:2<585 2015 98 10641 https://doi.org/10.1007/s10641-014-0292-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10641-014-0292-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fangue Nann Department of Wildlife, Fish, and Conservation Biology, University of California Davis, One Shields Avenue, 95616, Davis, CA, USA aut NATIONALLICENCE 700 1- Cocherell Dennis Department of Wildlife, Fish, and Conservation Biology, University of California Davis, One Shields Avenue, 95616, Davis, CA, USA aut NATIONALLICENCE 700 1- La Luz Felipe Department of Wildlife, Fish, and Conservation Biology, University of California Davis, One Shields Avenue, 95616, Davis, CA, USA aut NATIONALLICENCE 700 1- Cech Jr Joseph Department of Wildlife, Fish, and Conservation Biology, University of California Davis, One Shields Avenue, 95616, Davis, CA, USA aut NATIONALLICENCE 700 1- Thompson Lisa Department of Wildlife, Fish, and Conservation Biology, University of California Davis, One Shields Avenue, 95616, Davis, CA, USA aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Springer Netherlands 98/2(2015-02-01), 585-596 0378-1909 98:2<585 2015 98 10641