Effect of Brackish Salinities on Oxygen Consumption of Bat Rays (Myliobatis californica)

Christopher J. Meloni; Joseph J. Cech Jr.; Shana M. Katzman

doi:10.1643/0045-8511(2002)002[0462:EOBSOO]2.0.CO;2

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Christopher J. Meloni,¹ Joseph J. Cech Jr.,¹ Shana M. Katzman¹

¹Department of Wildlife, Fish, and Conservation Biology, University of California, One Shields Avenue, Davis, California 95616. Present address: (SMK) Biocurrents Research Center, Marine Biological Laboratory, Woods Hole, Massachusetts 02543. (JJC) .

Abstract

We measured resting routine oxygen consumption rates (MO₂, in mg O₂ · h⁻¹ · kg^−0.67) of bat rays (Myliobatis californica) under two seawater (33, 35 ppt) and two brackish (15, 25 ppt) salinity conditions. A significant increase in MO₂ was observed for rays in 15 and 25 ppt brackish water, compared with those in 33 or 35 ppt, presumably due to increased osmoregulatory costs. Our results suggest that energetic factors associated with seasonal decreases in salinity may influence the out-migration of bat rays from Tomales Bay (California) during the winter months.

The American Society of Ichthyologists and Herpetologists

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Christopher J. Meloni, Joseph J. Cech Jr., and Shana M. Katzman "Effect of Brackish Salinities on Oxygen Consumption of Bat Rays (Myliobatis californica)," Copeia 2002(2), 462-465, (1 May 2002). https://doi.org/10.1643/0045-8511(2002)002[0462:EOBSOO]2.0.CO;2

Accepted: 16 November 2001; Published: 1 May 2002

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