Supplementary material from "Patterns of annual and seasonal immune investment in a temporal reproductive opportunist"
Posted on 2020-06-18 - 16:15
Historically, investigations of how organismal investments in immunity fluctuate in response to environmental and physiological changes have focused on seasonally breeding organisms that confine reproduction to seasons with relatively unchallenging environmental conditions and abundant resources. The red crossbill, Loxia curvirostra, is a songbird that can breed opportunistically if conifer seeds are abundant, on both short, cold, and long, warm days, providing an ideal system to investigate environmental and reproductive effects on immunity. In this study, we measured inter- and intra-annual variation in complement, natural antibodies, PIT54 and leucocytes in crossbills across four summers (2010–2013) and multiple seasons within 1 year (summer 2011–spring 2012). Overall, we observed substantial changes in crossbill immune investment among summers, with interannual variation driven largely by food resources, while variation across multiple seasons within a single cone year was less pronounced and lacked a dominant predictor of immune investment. However, we found weak evidence that physiological processes (e.g. reproductive condition, moult) or abiotic factors (e.g. temperature, precipitation) affect immune investment. Collectively, this study suggests that a reproductively flexible organism may be able to invest in both reproduction and survival-related processes, potentially by exploiting rich patches with abundant resources. More broadly, these results emphasize the need for more longitudinal studies of trade-offs associated with immune investment.
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Schultz, Elizabeth M.; Gunning, Christian E.; Cornelius, Jamie M.; Reichard, Dustin G.; Klasing, Kirk C.; Hahn, Thomas P. (2020). Supplementary material from "Patterns of annual and seasonal immune investment in a temporal reproductive opportunist". The Royal Society. Collection. https://doi.org/10.6084/m9.figshare.c.5027693.v1