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Marine Ecology Progress Series

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MEPS 650:141-152 (2020)  -  DOI:

Respiration rates of herring larvae at different salinities, and effects of previous environmental history

Florian Berg1,2,*, Leif Andersson3,4,5, Arild Folkvord1,2

1Department of Biological Sciences, University of Bergen, 5020 Bergen, Norway
2Institute of Marine Research (IMR), 5018 Bergen, Norway
3Science for Life Laboratory, Department of Medical Biochemistry and Microbiology, Uppsala University, 751 23 Uppsala, Sweden
4Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, 750 07 Uppsala, Sweden
5Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, Texas 77843-4458, USA
*Corresponding author:
Advance View was available online May 14, 2020

ABSTRACT: Metabolic rates of early life history stages of marine fishes show considerable inter-individual differences, and are highly influenced by extrinsic factors like temperature or food availability. Measuring oxygen uptake rates is a proxy for estimating metabolic rates. Still, the relationship between respiration rates and ambient or previous salinity conditions as well as parental and developmental acclimation to changes in salinity remains largely unexplored. In the present study, we conducted experiments to investigate the effects of salinity on the routine metabolic rates (RMR) of euryhaline Atlantic herring Clupea harengus larvae at 3 levels of salinity: low (6 psu), intermediate (16 psu) and high (35 psu), reflecting ecologically relevant conditions for herring populations in the Atlantic Ocean and Baltic Sea. The larvae originated from different genetic backgrounds and salinity adaptations to account for cross-generation effects on metabolic rates. Closed respirometry carried out over 24 h on individual fish larvae generally confirmed near isometric respiration rates at all salinity regimes, with rates being 15.4% higher at 6 psu and 7.5% higher at 35 psu compared to 16 psu conditions. However, transgenerational acclimation to different salinity regimes of the parents had no effect on the salinity-specific metabolic rates of their offspring. Our study demonstrates the ability of herring to cope with a wide range of salinity conditions, irrespective of parental environmental history and genetic origin. This phenotypic plasticity is considered to be one of the main contributing factors to the success of herring as a widely distributed fish species in the North Atlantic and adjacent waters.

KEY WORDS: Respiration · Salinity · Clupea harengus · Larval fish · Osmoregulation

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Cite this article as: Berg F, Andersson L, Folkvord A (2020) Respiration rates of herring larvae at different salinities, and effects of previous environmental history. Mar Ecol Prog Ser 650:141-152.

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