Increased Immune Marker Variance in a Population of Invasive Birds

Overview

Journal Sci Rep

Specialty Science

Date 2020 Dec 11

PMID 33303774

Citations 3

Authors

Hanna Pruter

Mathias Franz

Sonke Twietmeyer

Niklas Bohm

Gudrun Middendorff

Ruben Portas

Jorg Melzheimer

Holger Kolberg

Georg von Samson-Himmelstjerna

Alex D Greenwood

Dorte Luschow

Kristin Muhldorfer

Gabor Arpad Czirjak

Affiliations

Soon will be listed here.

Abstract

Immunity and parasites have been linked to the success of invasive species. Especially lower parasite burden in invasive populations has been suggested to enable a general downregulation of immune investment (Enemy Release and Evolution of Increased Competitive Ability Hypotheses). Simultaneously, keeping high immune competence towards potentially newly acquired parasites in the invasive range is essential to allow population growth. To investigate the variation of immune effectors of invasive species, we compared the mean and variance of multiple immune effectors in the context of parasite prevalence in an invasive and a native Egyptian goose (Alopochen aegyptiacus) population. Three of ten immune effectors measured showed higher variance in the invasive population. Mean levels were higher in the invasive population for three effectors but lower for eosinophil granulocytes. Parasite prevalence depended on the parasite taxa investigated. We suggest that variation of specific immune effectors, which may be important for invasion success, may lead to higher variance and enable invasive species to reduce the overall physiological cost of immunity while maintaining the ability to efficiently defend against novel parasites encountered.

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