DataSheet2.pdf
Diving seabirds that overwinter at high latitudes experience persistent cold exposure, short days and associated declines in ocean productivity that can challenge their ability to balance daily energy budgets. We used dive-immersion geo-locators to test the hypothesis that pursuit-diving Common murr...
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ftfrontimediafig:oai:figshare.com:article/6021650 2023-05-15T15:56:05+02:00 DataSheet2.pdf Chantelle M. Burke William A. Montevecchi 2018-03-23T10:04:52Z https://doi.org/10.3389/fmars.2018.00063.s002 https://figshare.com/articles/DataSheet2_pdf/6021650 unknown doi:10.3389/fmars.2018.00063.s002 https://figshare.com/articles/DataSheet2_pdf/6021650 CC BY 4.0 CC-BY Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering winter survival North Atlantic daily energy expenditure diving seabird flexible foraging behavior common murre bird-borne loggers Dataset 2018 ftfrontimediafig https://doi.org/10.3389/fmars.2018.00063.s002 2018-03-28T22:56:57Z Diving seabirds that overwinter at high latitudes experience persistent cold exposure, short days and associated declines in ocean productivity that can challenge their ability to balance daily energy budgets. We used dive-immersion geo-locators to test the hypothesis that pursuit-diving Common murres (Uria aalge) will respond to the challenges of winter in the North Atlantic through increased daily energy expenditures (DEE) that will be met by increased foraging effort and adjustments in dive tactics. Largely flightless in winter (<5% of daylight hours flying), murres spent most of their time on the water (>85% resting and swimming). Accordingly, when sea surface temperatures (SST) were consistently near freezing in late winter (1.9 ± 0.8°C), mean DEE (2463.2 ± 10.9 kJ day −1 ) exceeded the theoretical limit to sustainable energy expenditure in vertebrates (i.e., 7 X Basal Metabolic Rate or 2450 kJ day −1 for murres). Consistently deep (70% >50 m) and long dives in late winter, 38% of which exceeded their calculated aerobic dive limit indicate that targeted prey was distributed in deep (dark) waters. Consequently, foraging was largely diurnal; likely because capture efficiency of deep-water prey is poor under low light. Murres responded to these late winter time and energy constraints with a nearly two-fold increase in daily time spent diving (95.2 ± 5.6 and 178.3 ± 6.3 min day −1 during early and late winter, respectively), an increase in dive bout frequency and duration, and correspondingly less time resting between bouts. Uniquely adapted for deep-diving, pursuit-diving can push their dive limits to maximize daily energy intake when energy demands are high and prey are distributed in deep water. Our study highlights late winter as an extremely challenging phase in the annual cycle of North Atlantic murres and provides critical insights into the behavioral mechanisms underlying their winter survival. Dataset Common Murre North Atlantic Uria aalge uria Frontiers: Figshare Dee ENVELOPE(-59.767,-59.767,-62.433,-62.433) |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering winter survival North Atlantic daily energy expenditure diving seabird flexible foraging behavior common murre bird-borne loggers |
spellingShingle |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering winter survival North Atlantic daily energy expenditure diving seabird flexible foraging behavior common murre bird-borne loggers Chantelle M. Burke William A. Montevecchi DataSheet2.pdf |
topic_facet |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering winter survival North Atlantic daily energy expenditure diving seabird flexible foraging behavior common murre bird-borne loggers |
description |
Diving seabirds that overwinter at high latitudes experience persistent cold exposure, short days and associated declines in ocean productivity that can challenge their ability to balance daily energy budgets. We used dive-immersion geo-locators to test the hypothesis that pursuit-diving Common murres (Uria aalge) will respond to the challenges of winter in the North Atlantic through increased daily energy expenditures (DEE) that will be met by increased foraging effort and adjustments in dive tactics. Largely flightless in winter (<5% of daylight hours flying), murres spent most of their time on the water (>85% resting and swimming). Accordingly, when sea surface temperatures (SST) were consistently near freezing in late winter (1.9 ± 0.8°C), mean DEE (2463.2 ± 10.9 kJ day −1 ) exceeded the theoretical limit to sustainable energy expenditure in vertebrates (i.e., 7 X Basal Metabolic Rate or 2450 kJ day −1 for murres). Consistently deep (70% >50 m) and long dives in late winter, 38% of which exceeded their calculated aerobic dive limit indicate that targeted prey was distributed in deep (dark) waters. Consequently, foraging was largely diurnal; likely because capture efficiency of deep-water prey is poor under low light. Murres responded to these late winter time and energy constraints with a nearly two-fold increase in daily time spent diving (95.2 ± 5.6 and 178.3 ± 6.3 min day −1 during early and late winter, respectively), an increase in dive bout frequency and duration, and correspondingly less time resting between bouts. Uniquely adapted for deep-diving, pursuit-diving can push their dive limits to maximize daily energy intake when energy demands are high and prey are distributed in deep water. Our study highlights late winter as an extremely challenging phase in the annual cycle of North Atlantic murres and provides critical insights into the behavioral mechanisms underlying their winter survival. |
format |
Dataset |
author |
Chantelle M. Burke William A. Montevecchi |
author_facet |
Chantelle M. Burke William A. Montevecchi |
author_sort |
Chantelle M. Burke |
title |
DataSheet2.pdf |
title_short |
DataSheet2.pdf |
title_full |
DataSheet2.pdf |
title_fullStr |
DataSheet2.pdf |
title_full_unstemmed |
DataSheet2.pdf |
title_sort |
datasheet2.pdf |
publishDate |
2018 |
url |
https://doi.org/10.3389/fmars.2018.00063.s002 https://figshare.com/articles/DataSheet2_pdf/6021650 |
long_lat |
ENVELOPE(-59.767,-59.767,-62.433,-62.433) |
geographic |
Dee |
geographic_facet |
Dee |
genre |
Common Murre North Atlantic Uria aalge uria |
genre_facet |
Common Murre North Atlantic Uria aalge uria |
op_relation |
doi:10.3389/fmars.2018.00063.s002 https://figshare.com/articles/DataSheet2_pdf/6021650 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmars.2018.00063.s002 |
_version_ |
1766391562193862656 |