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2017 ; 114
(14
): 3678-3683
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Experimental evidence that parasites drive eco-evolutionary feedbacks
#MMPMID28320947
Brunner FS
; Anaya-Rojas JM
; Matthews B
; Eizaguirre C
Proc Natl Acad Sci U S A
2017[Apr]; 114
(14
): 3678-3683
PMID28320947
show ga
Host resistance to parasites is a rapidly evolving trait that can influence how
hosts modify ecosystems. Eco-evolutionary feedbacks may develop if the ecosystem
effects of host resistance influence selection on subsequent host generations. In
a mesocosm experiment, using a recently diverged (<100 generations) pair of lake
and stream three-spined sticklebacks, we tested how experimental exposure to a
common fish parasite (Gyrodactylus spp.) affects interactions between hosts and
their ecosystems in two environmental conditions (low and high nutrients). In
both environments, we found that stream sticklebacks were more resistant to
Gyrodactylus and had different gene expression profiles than lake sticklebacks.
This differential infection led to contrasting effects of sticklebacks on a broad
range of ecosystem properties, including zooplankton community structure and
nutrient cycling. These ecosystem modifications affected the survival, body
condition, and gene expression profiles of a subsequent fish generation. In
particular, lake juvenile fish suffered increased mortality in ecosystems
previously modified by lake adults, whereas stream fish showed decreased body
condition in stream fish-modified ecosystems. Parasites reinforced selection
against lake juveniles in lake fish-modified ecosystems, but only under
oligotrophic conditions. Overall, our results highlight the overlapping
timescales and the interplay of host-parasite and host-ecosystem interactions. We
provide experimental evidence that parasites influence host-mediated effects on
ecosystems and, thereby, change the likelihood and strength of eco-evolutionary
feedbacks.