Lightscapes of fear: How mesopredators balance starvation and predation in the open ocean
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Lightscapes of fear : How mesopredators balance starvation and predation in the open ocean. / Beltran, Roxanne S; Kendall-Bar, Jessica M; Pirotta, Enrico; Adachi, Taiki; Naito, Yasuhiko; Takahashi, Akinori; Cremers, Jolien; Robinson, Patrick W; Crocker, Daniel E; Costa, Daniel P.
In: Science Advances, Vol. 7, No. 12, 03.2021.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Lightscapes of fear
T2 - How mesopredators balance starvation and predation in the open ocean
AU - Beltran, Roxanne S
AU - Kendall-Bar, Jessica M
AU - Pirotta, Enrico
AU - Adachi, Taiki
AU - Naito, Yasuhiko
AU - Takahashi, Akinori
AU - Cremers, Jolien
AU - Robinson, Patrick W
AU - Crocker, Daniel E
AU - Costa, Daniel P
N1 - Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
PY - 2021/3
Y1 - 2021/3
N2 - Like landscapes of fear, animals are hypothesized to strategically use lightscapes based on intrinsic motivations. However, longitudinal evidence of state-dependent risk aversion has been difficult to obtain in wild animals. Using high-resolution biologgers, we continuously measured body condition, time partitioning, three-dimensional movement, and risk exposure of 71 elephant seals throughout their 7-month foraging migrations (N = 16,000 seal days). As body condition improved from 21 to 32% fat and daylength declined from 16 to 10 hours, seals rested progressively earlier with respect to sunrise, sacrificing valuable nocturnal foraging hours to rest in the safety of darkness. Seals in superior body condition prioritized safety over energy conservation by resting >100 meters deeper where it was 300× darker. Together, these results provide empirical evidence that marine mammals actively use the three-dimensional lightscape to optimize risk-reward trade-offs based on ecological and physiological factors.
AB - Like landscapes of fear, animals are hypothesized to strategically use lightscapes based on intrinsic motivations. However, longitudinal evidence of state-dependent risk aversion has been difficult to obtain in wild animals. Using high-resolution biologgers, we continuously measured body condition, time partitioning, three-dimensional movement, and risk exposure of 71 elephant seals throughout their 7-month foraging migrations (N = 16,000 seal days). As body condition improved from 21 to 32% fat and daylength declined from 16 to 10 hours, seals rested progressively earlier with respect to sunrise, sacrificing valuable nocturnal foraging hours to rest in the safety of darkness. Seals in superior body condition prioritized safety over energy conservation by resting >100 meters deeper where it was 300× darker. Together, these results provide empirical evidence that marine mammals actively use the three-dimensional lightscape to optimize risk-reward trade-offs based on ecological and physiological factors.
U2 - 10.1126/sciadv.abd9818
DO - 10.1126/sciadv.abd9818
M3 - Journal article
C2 - 33731347
VL - 7
JO - Science advances
JF - Science advances
SN - 2375-2548
IS - 12
ER -
ID: 258887659