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- W4214952014 abstract "Abstract A parasite can change its host’s behavior in spectacular ways. When the saltmarsh amphipod Orchestia grillus (Bosc, 1802) is infected with the trematode Levinseniella byrdi (Heard, 1968) it is bright orange and is found in the open unlike uninfected individuals. I tested the hypothesis that infected amphipods are found in the open because L. byrdi reverses their innate photophobia. During daytime treatments and when placed in a dark chamber, 0% of the uninfected and 20% of the infected amphipods, on average, moved to the light chamber after 30 minutes. When placed in a light chamber, 91% of the uninfected and 53% of the infected amphipods, on average, went to the dark side after 30 minutes. These results clearly indicate that O. grillus is normally photophobic, but not drawn to light when infected with L. byrdi. Instead, L. byrdi appears to neutralize the amphipod’s photophobia. Uninfected O. grillus are typically found under vegetation. I hypothesize that O. grillus with L. byrdi infections wander into open, unvegetated habitats randomly. In addition, 94% of infected amphipods could be touched by a finger in the field suggesting they can be easily caught by predators. Levinseniella byrdi infects at least three other amphipod hosts, Chelorchestia forceps (Smith & Heard, 2001), Uhlorchestia spartinophila (Bousfield & Heard, 1986), and U. uhleri (Shoemaker, 1930). The parasite-manipulation hypothesis suggests that the parasite-induced changes (conspicuous body color and neutralized light response) are adaptive for L. byrdi to make amphipod hosts more susceptible to bird predators, the definitive hosts. This hypothesis remains to be tested." @default.
- W4214952014 created "2022-03-05" @default.
- W4214952014 creator A5062277362 @default.
- W4214952014 date "2022-04-04" @default.
- W4214952014 modified "2023-10-18" @default.
- W4214952014 title "Are amphipods <i>Orchestia grillus</i> (Bosc, 1802) (Amphipoda: Talitridae) infected with the trematode <i>Levinseniella byrdi</i> (Heard, 1968) drawn to the light?" @default.
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- W4214952014 doi "https://doi.org/10.1093/jcbiol/ruac017" @default.
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