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Immune response to nylon filaments in two damselfly species that differ in their resistance to ectoparasitic mites
This work has shown that the ability of insects to resist parasites using melanotic encapsulation, a proxy of the amount of resistance that the host is capable of mounting to natural parasites, is limited by the type of parasite that they are infected with.
Relative geographic range of sibling species of host damselflies does not reliably predict differential parasitism by water mites
The Arrenurus examined in this study appear to be ecological specialists, restricted to a particular type of habitat, parasitizing few to many of the host species present in that site or habitat.
Explaining Susceptibility and Resistance to a Multi-Host Parasite
The results suggest that there might have been strong historical selection from this mite on the bog specialist, N. gracilis, and that this selection may have resulted in resistance evolving to fixation in a series of isolated populations.
Host phenology, geographic range size and regional occurrence explain interspecific variation in damselfly–water mite associations
The need to measure factors at several ecological scales in order to understand the breadth of evolutionary interactions with host – parasite associations and the selective ‘ milieu ’ for particular species of both hosts and parasites is demonstrated.
Seasonality of gregarine parasitism in the damselfly, Nehalennia irene: understanding unimodal patterns
Using aggregate data from 12 date-by-site comparisons involving five sites, it is found that both prevalence and intensity of gregarine parasitism were seasonally unimodal.
Higher gregarine parasitism often in sibling species of host damselflies with smaller geographical distributions
Inter‐specific variation in parasitism by gregarines (Eugregarinorida: Actinocephalidae) among sibling species of damselflies (Odonata: Zygoptera) is investigated in relation to relative size of geographical ranges of host species.
Comparing natural parasitism and resistance with proxies of host immune response in Lestid damselflies
The species with the strongest melanization response to the inserts and the highest PO levels was the one that currently experienced no mite parasitism, supported by earlier work done with Lepidoptera in which the most well-defended species currently experience no natural parasitism.
Enemy escape: A general phenomenon in a fragmented literature?
Many populations are thought to be regulated, in part, by their natural enemies. If so, disruption of this regulation should allow rapid population growth. Such “enemy escape” may occur in a variet...
Testing the enemy release hypothesis in a native insect species with an expanding range
The ERH was not supported: Enallagma clausum has higher or the same levels of parasitism in new sites than old sites, however, E. boreale seems to be benefitting from the recent range expansion of a native, closely related species through ecological release from its parasites because the parasites may be choosing to infest the novel, potentially naïve, host instead of the well-established host.
Relationships Between Gregarine Infection in Damselflies, Wetland Type, and Landscape Characteristics
The results suggest that parasitism of damselflies by gregarines is associated with wetland type and landscape characteristics, although the mechanisms producing such relationships are unknown.