Difference in the hypoxia tolerance of the round crucian carp and largemouth bass: implications for physiological refugia in the macrophyte zone |
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| Authors: | Hiroki Yamanaka Yukihiro Kohmatsu Masahide Yuma |
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| Affiliation: | (1) Center for Ecological Research, Kyoto University, 2-509-3 Hirano, Otsu, Shiga 520-2113, Japan;(2) Research Institute for Humanity and Nature, 457-4 Motoyama, Kamigamo, Kita-ku, Kyoto 603-8047, Japan;(3) Department of Environmental Solution Technology, Faculty of Science & Technology, Ryukoku University, 1-5 Seta-Oe, Otsu, Shiga 520-2194, Japan;(4) Present address: Research Institute for Humanity and Nature (RIHN), 457-4 Motoyama, Kamigamo, Kita-ku, Kyoto 603-8047, Japan |
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| Abstract: | The hypoxia tolerance of larval and juvenile round crucian carp, Carassius auratus grandoculis, and largemouth bass, Micropterus salmoides, was determined using respirometry to examine the potential of hypoxic areas in the macrophyte zone as physiological refugia for round crucian carp. The tolerance, which was measured as the critical oxygen concentration (Pc), was 1.32 mg O2/l in the round crucian carp and 1.93 mg O2/l in the largemouth bass. As the round crucian carp tolerated hypoxia better than the largemouth bass, hypoxic areas in the macrophyte zone might function as physiological refugia for round crucian carp. |
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| Keywords: | Hypoxia tolerance Critical oxygen concentration (Pc) Physiological refugia Carassius auratus grandoculis Micropterus salmoides |
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