Parental Birds Incubating Larger Clutches Regulate Their Field Metabolic Rates in Response to Environmental Changes

Kume, Yuna; Shirai, Masayuki; Mizutani, Yuichi; Niizuma, Yasuaki

doi:10.2326/osj.18.167

Cited by 3 publications

(2 citation statements)

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“…The method allowed an estimation of initial isotope enrichment from a single blood sample and was a less invasive technique with lower impact on the behavior of study subjects ( Schultner et al, 2010 ; Niizuma & Shirai, 2015 ). Recent validation studies have demonstrated that the precision of the DLW technique can be increased by using a longer sampling interval and/or by applying it to a species with a higher metabolic rate ( Shirai et al, 2015 ; Kume et al, 2019 ). The DLW injectate used in our study contained 21.0 atom percent 18 O, 10.5 atom percent 2 H, and 0.9% NaCl.…”

Section: Methodsmentioning

confidence: 99%

Field and laboratory metabolism and thermoregulation in rhinoceros auklets

Umeyama

Niizuma

Shirai

2021

PeerJ

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Seabirds spend most of their lives at sea, except when visiting their breeding sites. Since the thermal conductivity of water is 25 times higher than that of air, seabirds resting on water lose heat and expend a considerable amount of energy for thermoregulation. For example, rhinoceros auklet (Cerorhinca monocerata), a medium-sized (480–620 g) alcid, spends most of its time floating on the sea. In order to estimate the cost of this behavior in terms of their daily energy expenditure (DEE), we studied rhinoceros auklets breeding on Teuri Island, Hokkaido Japan. We measured their resting metabolic rate (RMR) in air and on water by respirometry, and estimated their DEE by the doubly labeled water method. While RMR on water did not vary significantly between 10 °C and 15 °C, it was significantly higher at 5 °C. Air temperature (5.0–20.0 °C) had no effect on RMR. The DEE of free-ranging auklets averaged 1,005.5 kJ day−1 (±130.2, n = 3). Our results indicate that RMRs are elevated for auklets resting on water, particularly below their lower critical temperature (LCT), compared with in air. Accordingly, spending time above their LCT on water at any time of year will provide enhanced benefits, particularly to seabirds such as rhinoceros auklets which rest a considerable amount of time on water.

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Section: Methodsmentioning

confidence: 99%

Field and laboratory metabolism and thermoregulation in rhinoceros auklets

Umeyama

Niizuma

Shirai

2021

PeerJ

Self Cite

View full text Add to dashboard Cite

show abstract

“…The method allowed an estimation of initial isotope enrichment from a single blood sample and was a less invasive technique with lower impact on the behavior of study subjects (Schultner et al, 2010;. Recent validation studies have demonstrated that the precision of the DLW technique can be increased by using a longer sampling interval and/or by applying it to a species with a higher metabolic rate (Shirai et al, 2015;Kume et al, 2019). The DLW injectate used in our study contained 21.0 atom percent 18 O, 10.5 atom percent 2 H, and 0.9% NaCl.…”

Section: Study Area and Speciesmentioning

confidence: 99%

Peer Review #3 of "Field and laboratory metabolism and thermoregulation in rhinoceros auklets (v0.3)"

Green¹

2021

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Seabirds spend most of their lives at sea, except when visiting their breeding sites. Since the thermal conductivity of water is 25 times higher than that of air, seabirds resting on water lose heat and expend a considerable amount of energy for thermoregulation. For example, rhinoceros auklet (Cerorhinca monocerata), a medium-sized (480-620 g) alcid, spends most of its time floating on the sea. In order to estimate the cost of this behavior in terms of their daily energy expenditure (DEE), we studied rhinoceros auklets breeding on Teuri Island, Hokkaido Japan. We measured their resting metabolic rate (RMR) in air and on water by respirometry, and estimated their DEE by the doubly labeled water method.While RMR on water did not vary significantly between 10°C and 15°C, it was significantly higher at 5°C . Air temperature (5.0-20.0°C) had no effect on RMR. The DEE of freeranging auklets averaged 1005.5 kJday -1 (± 130.2, n = 3). Our results indicate that RMRs are elevated for auklets resting on water, particularly below their lower critical temperature (LCT), compared with in air. Accordingly, spending time above their LCT on water at any time of year will provide enhanced benefits, particularly to seabirds such as rhinoceros auklets which rest a considerable amount of time on water.

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