In contrast, autonomic cold-defense responses (energetically expensive) and heat-defense responses (water-consuming) are often recruited only when Tb starts changing because behavioral mechanisms were ineffective or could not have been used (e.g., due to competing behavioral demands) [1].
The fundamental idea of ecologic immunology is that maintaining a responsive immune system and mounting an immune response are energetically and nutritionally costly and that these costs have to be balanced against other expenses, such as reproduction, molting, growth, and development, that contribute to an animal's fitness (6, 10 ).
In this signal-detection metaphor, a low threshold for activation of the fight-or-flight response, though energetically costly during a false alarm (anxiety or panic attack), can prevent the far higher fitness cost of being killed by a predator or conspecific.
However, an oxidative stress response is energetically costly, and therefore requires metabolic fine-tuning.
Further studies integrating changes in individual physiology and behavior and colony regulation of division of labor will enhance our understanding of how social structures allocate resources in response to energetically costly infections.
Current research suggests that loss of LKB1, an important multi-tasking protein, is linked with changes in cell polarity and cytoskeletal rearrangements, and that these changes may drive tumor growth when the cellular metabolic balance is disrupted in response to energetically unfavorable conditions.
On the other hand, T-lymphocytes (CD-4 Th2 CD-4 Th2 IL-4, IL-5, IL-10 and IL-13, all of these anti-inflammatory molecules that promote antibody responses and energeneratey inhibit macrophage activity [ 58].
But the research thus far has used physical response – dolphins turning energetically toward the speakers emitting the whistles – as a proxy for the dolphins' ability to distinguish one whistle from another.
Escape reactions by listeners consume energy and allow the caller to take advantage of the listener's spatial movement; in contrast, vigilance-only reactions, while an appropriate antipredator response, are less energetically costly and do not provide the caller with any advantage in terms of opportunities to usurp the listener's spatial location.
Induction of environmental responses can be energetically costly (Hoekstra and Montooth 2013), and low resting metabolic rates may be selectively favored to maximize the energy available for growth, reproduction, and physiological responses to the environment (Artacho and Nespolo 2009; Ketola and Kotiaho 2009).
