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Hawaii

NOT Open Access | Stress in paradise: effects of elevated corticosterone on immunity and avian malaria resilience in a Hawaiian passerine

September 30, 2021 - 11:11 -- NOT Open Access
Author(s): 
Names GR, Schultz EM, Krause JS, Hahn TP, Wingfield JC, Heal M, Cornelius JM, Klasing KC, Hunt KE
Reference: 
J Exp Biol. 2021 Sep 23:jeb.242951

Vertebrates confronted with challenging environments often experience an increase in circulating glucocorticoids, which result in morphological, physiological, and behavioral changes that promote survival. However, chronically elevated glucocorticoids can suppress immunity, which may increase susceptibility to disease. Since the introduction of avian malaria to Hawaii a century ago, low elevation populations of Hawaii Amakihi (Chlorodrepanis virens) have undergone strong selection by avian malaria and evolved increased resilience (the ability to recover from infection), while populations at high elevation with few vectors have not undergone selection and remain susceptible.

NOT Open Access | Relationships between avian malaria resilience and corticosterone, testosterone and prolactin in a Hawaiian songbird

April 22, 2021 - 08:53 -- NOT Open Access
Author(s): 
Names GR, Krause JS, Schultz EM, Angelier F, Parenteau C, Ribout C, Hahn TP, Wingfield JC
Reference: 
Gen Comp Endocrinol. 2021 Apr 13:113784

Glucocorticoids, androgens, and prolactin regulate metabolism and reproduction, but they also play critical roles in immunomodulation. Since the introduction of avian malaria to Hawaii a century ago, low elevation populations of the Hawaii Amakihi (Chlorodrepanis virens) that have experienced strong selection by avian malaria have evolved increased resilience (the ability to recover from infection), while high elevation populations that have undergone weak selection remain less resilient.

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