Parental Males of the Plainfin Midshipman Are Physiologically Resilient to the Challenges of the Intertidal Zone
Parental Males of the Plainfin Midshipman Are Physiologically Resilient to the Challenges of the Intertidal Zone
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Date
2020
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Houpt, Noah
Borowiec, Brittney G.
Brown, Nicholas A. W.
Scott, Graham R.
Balshine, Sigal
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Physiological and Biochemical Zoology : PBZ ; 93 (2020), 2. - pp. 111-128. - The University of Chicago Press. - ISSN 1522-2152. - eISSN 1537-5293
Abstract
The decision of where to rear young is influenced by both the needs of offspring and the costs parents incur in certain rearing environments. Plainfin midshipman fish (Porichthys notatus) provide extended paternal care in rocky intertidal zones, where they experience regular bouts of aquatic hypoxia and air exposure during low-tide events. We investigated the physiological responses of plainfin midshipman males to three conditions for 6 h that simulate what these fish naturally experience during tidal cycles while nesting: normoxia, progressive hypoxia, or air exposure. Hypoxia- and air-exposed fish exhibited shifts in energy metabolites, driven largely by elevated lactate and glucose content and reduced glycogen content in several tissues (muscle, heart, liver, and brain), but the magnitude of these changes was relatively modest. Hematocrit increased most in air-exposed fish relative to normoxia-exposed fish, contributing to an increase in whole-blood hemoglobin concentration. Air exposure reduced swim bladder oxygen content, suggesting that internal O2 stores are drawn on during air exposure. In a second experiment, we found that aquatic surface respiration and gill ventilation frequency increased in hypoxia-exposed fish relative to normoxia-exposed fish. Overall, our results suggest that plainfin midshipman overcome the challenges of the intertidal environment through a variety of physiological strategies and exhibit little physiological disturbance in response to the fluctuating and extreme conditions created by regular low tides.
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570 Biosciences, Biology
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air exposure, hypoxia, intertidal zone, ecophysiology, nest site selection, anaerobic respiration
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HOUPT, Noah, Brittney G. BOROWIEC, Aneesh P. H. BOSE, Nicholas A. W. BROWN, Graham R. SCOTT, Sigal BALSHINE, 2020. Parental Males of the Plainfin Midshipman Are Physiologically Resilient to the Challenges of the Intertidal Zone. In: Physiological and Biochemical Zoology : PBZ. The University of Chicago Press. 93(2), pp. 111-128. ISSN 1522-2152. eISSN 1537-5293. Available under: doi: 10.1086/707408BibTex
@article{Houpt2020Paren-50125, year={2020}, doi={10.1086/707408}, title={Parental Males of the Plainfin Midshipman Are Physiologically Resilient to the Challenges of the Intertidal Zone}, number={2}, volume={93}, issn={1522-2152}, journal={Physiological and Biochemical Zoology : PBZ}, pages={111--128}, author={Houpt, Noah and Borowiec, Brittney G. and Bose, Aneesh P. H. and Brown, Nicholas A. W. and Scott, Graham R. and Balshine, Sigal} }
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