Published by Stéphane Garnier - 20-08-2016
Birds from invasive populations have fewer parasites and a lower inflammatory immune response than birds from native populations.
A biogeographical approach comparing populations of Spectacled Thrush (a neotropical species originated from South America that recently colonized the Lesser Antilles) between its native area and the geographic area recently colonized provided results that support two hypothesis proposed to explain the success in biological invasions: the Enemy Release Hypothesis (ERH) and the hypothesis of different immune defense strategies in invaders. First, populations from the recently colonized area have a lower prevalence of blood parasites than native populations. Second, the inflammatory response (the immune component that is the most costly) is lower in birds from the expansion range than in their native counterparts. These results have just been published in Ecology and Evolution (see Project/Results section).
Publication reference: Bailly J, Garnier S, Khimoun A, Arnoux E, Eraud C, Goret J-Y, Luglia T, Gaucher P, Faivre B (2016) Reduced inflammation in expanding populations of a neotropical bird species. Ecology and Evolution in press.