Sources of variance in immunological traits: evidence of congruent latitudinal trends across species

The Journal of Experimental Biology
Hendrik MeisterDalial Freitak

Abstract

Among-population differences in immunological traits allow assessment of both evolutionary and plastic changes in organisms' resistance to pathogens. Such knowledge also provides information necessary to predict responses of such traits to environmental changes. Studies on latitudinal trends in insect immunity have so far yielded contradictory results, suggesting that multispecies approaches with highly standardised experimental conditions are needed. Here, we studied among-population differences of two parameters reflecting constitutive immunity-phenoloxidase (PO) and lytic activity, using common-garden design on three distantly related moth species represented by populations ranging from northern Finland to Georgia (Caucasus). The larvae were reared at different temperatures and on different host plants under a crossed factors experimental design. Haemolymph samples for measurement of immune status were taken from the larvae strictly synchronously. Clear among-population differences could be shown only for PO activity in one species (elevated activity in the northern populations). There was some indication that the cases of total absence of lytic activity were more common in southern populations. The effects of temperature, h...Continue Reading

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Citations

Mar 25, 2019·Journal of Evolutionary Biology·Dalial FreitakToomas Esperk
Dec 20, 2019·The Journal of Animal Ecology·Daniel J BeckerRaina K Plowright
Jan 21, 2021·Journal of Fungi·Robin GielenKadri Põldmaa

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