Author: Bray, Daniel P.; Bennett, Malcolm; Stockley, Paula; Hurst, Jane L.; Kipar, Anja
Title: Composition and Function of Haemolymphatic Tissues in the European Common Shrew Document date: 2008_10_15
ID: 104sqoxz_1
Snippet: The immune system is the primary mechanism through which animals defend against parasites and pathogenic organisms. Immunity is believed to be a major factor in regulating host survival, as under natural conditions, even a mild parasitic infection may weaken an animal sufficiently to increase the chances of mortality through starvation or predation [1] . However, maintenance and up-regulation of the immune system requires energetic and nutritiona.....
Document: The immune system is the primary mechanism through which animals defend against parasites and pathogenic organisms. Immunity is believed to be a major factor in regulating host survival, as under natural conditions, even a mild parasitic infection may weaken an animal sufficiently to increase the chances of mortality through starvation or predation [1] . However, maintenance and up-regulation of the immune system requires energetic and nutritional resources [1] , resulting in a trade-off between investment in immunity and other physiological processes, including growth and reproduction [2] [3] [4] . An appreciation of the extent to which hosts invest in immunity is therefore critical to understanding the strategies through which animals maximise fitness, and how trade-offs are mediated between current offspring production, longevity and future reproductive success [3, 4] .
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