Hormone-mediated foraging strategies in an uncertain environment: Insights into the at-sea behavior of a marine predator

De Rango E, Schwarz J, Piedrahita P, Paez-Rosas D, Crocker DE, Krüger O (2021)
Ecology and Evolution.

Zeitschriftenaufsatz | E-Veröff. vor dem Druck | Englisch
 
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Autor*in
De Rango, EugeneUniBi; Schwarz, JonasUniBi; Piedrahita, Paolo; Paez-Rosas, Diego; Crocker, Daniel E.; Krüger, OliverUniBi
Abstract / Bemerkung
Hormones are extensively known to be physiological mediators of energy mobilization and allow animals to adjust behavioral performance in response to their environment, especially within a foraging context. Few studies, however, have narrowed focus toward the consistency of hormonal patterns and their impact on individual foraging behavior. Describing these relationships can further our understanding of how individuals cope with heterogeneous environments and exploit different ecological niches. To address this, we measured between- and within-individual variation of basal cortisol (CORT), thyroid hormone T3, and testosterone (TEST) levels in wild adult female Galapagos sea lions (Zalophus wollebaeki) and analyzed how these hormones may be associated with foraging strategies. In this marine predator, females exhibit one of three spatially and temporally distinct foraging patterns (i.e., "benthic," "pelagic," and "night" divers) within diverse habitat types. Night divers differentiated from other strategies by having lower T3 levels. Considering metabolic costs, night divers may represent an energetically conservative strategy with shorter dive durations, depths, and descent rates to exploit prey which migrate up the water column based on vertical diel patterns. Intriguingly, CORT and TEST levels were highest in benthic divers, a strategy characterized by congregating around limited, shallow seafloors to specialize on confined yet reliable prey. This pattern may reflect hormone-mediated behavioral responses to specific risks in these habitats, such as high competition with conspecifics, prey predictability, or greater risks of predation. Overall, our study highlights the collective effects of hormonal and ecological variation on marine foraging. In doing so, we provide insights into how mechanistic constraints and environmental pressures may facilitate individual specialization in adaptive behavior in wild populations.
Stichworte
cortisol; diving behavior; Galapagos sea lion; repeatability; testosterone; thyroid
Erscheinungsjahr
2021
Zeitschriftentitel
Ecology and Evolution
eISSN
2045-7758
Page URI
https://pub.uni-bielefeld.de/record/2955106

Zitieren

De Rango E, Schwarz J, Piedrahita P, Paez-Rosas D, Crocker DE, Krüger O. Hormone-mediated foraging strategies in an uncertain environment: Insights into the at-sea behavior of a marine predator. Ecology and Evolution. 2021.
De Rango, E., Schwarz, J., Piedrahita, P., Paez-Rosas, D., Crocker, D. E., & Krüger, O. (2021). Hormone-mediated foraging strategies in an uncertain environment: Insights into the at-sea behavior of a marine predator. Ecology and Evolution. https://doi.org/10.1002/ece3.7590
De Rango, E., Schwarz, J., Piedrahita, P., Paez-Rosas, D., Crocker, D. E., and Krüger, O. (2021). Hormone-mediated foraging strategies in an uncertain environment: Insights into the at-sea behavior of a marine predator. Ecology and Evolution.
De Rango, E., et al., 2021. Hormone-mediated foraging strategies in an uncertain environment: Insights into the at-sea behavior of a marine predator. Ecology and Evolution.
E. De Rango, et al., “Hormone-mediated foraging strategies in an uncertain environment: Insights into the at-sea behavior of a marine predator”, Ecology and Evolution, 2021.
De Rango, E., Schwarz, J., Piedrahita, P., Paez-Rosas, D., Crocker, D.E., Krüger, O.: Hormone-mediated foraging strategies in an uncertain environment: Insights into the at-sea behavior of a marine predator. Ecology and Evolution. (2021).
De Rango, Eugene, Schwarz, Jonas, Piedrahita, Paolo, Paez-Rosas, Diego, Crocker, Daniel E., and Krüger, Oliver. “Hormone-mediated foraging strategies in an uncertain environment: Insights into the at-sea behavior of a marine predator”. Ecology and Evolution (2021).

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