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Metabolic suppression in thecosomatous pteropods as an effect of low temperature and hypoxia in the eastern tropical North Pacific

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Abstract

Many pteropod species in the eastern tropical North Pacific Ocean migrate vertically each day, transporting organic matter and respiratory carbon below the thermocline. These migrations take species into cold (15–10° C) hypoxic water (<20 μmol O2 kg−1) at depth. We measured the vertical distribution, oxygen consumption and ammonia excretion for seven species of pteropod, some of which migrate and some which remain in oxygenated surface waters throughout the day. Within the upper 200 m of the water column, changes in water temperature result in a ~60–75 % reduction in respiration for most species. All three species tested under hypoxic conditions responded to low O2 with an additional ~35–50 % reduction in respiratory rate. Combined, low temperature and hypoxia suppress the metabolic rate of pteropods by ~80–90 %. These results shed light on the ways in which expanding regions of hypoxia and surface ocean warming may impact pelagic ecology.

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Acknowledgments

We are grateful for the assistance of our divers R. Rosa, L. Elder, B. Phillips, C. Cass and P. Suprenand who provided us with research organisms. We would like to thank D. Outram for her assistance in collecting and compiling the distributional data as well as all the students who helped at sea and in the laboratory with the MOCNESS samples. We would like to acknowledge the hard work and dedication of the Captain and Crew of the R/V New Horizon, the R/V Seward Johnson and the R/V Knorr and to thank K. Daly for her organization of the ETP research expeditions. This work was funded by National Science Foundation grants to K. Wishner and B. Seibel (OCE—0526502 and OCE—0851043) and to K. Daly (OCE—0526545), the University of Rhode Island and the Rhode Island Experimental Program to Stimulate Competitive Research Fellowship program.

Ethical standards

The experiments were done in international waters, exempting them from legislation; however, experiments were conducted to comply with the current laws of the United States of America.

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The authors declare that they have no conflicts of interest.

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Correspondence to Amy E. Maas.

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Communicated by U. Sommer.

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Maas, A.E., Wishner, K.F. & Seibel, B.A. Metabolic suppression in thecosomatous pteropods as an effect of low temperature and hypoxia in the eastern tropical North Pacific. Mar Biol 159, 1955–1967 (2012). https://doi.org/10.1007/s00227-012-1982-x

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