Grace Marnon presentation

predators and disease

predators drive disease dynamics

• reduce disease transmission

predator in study

green crab from the gulf of Maine

exp 1 question

Do R. roscovita and C. lingua alter transmission dynamics in response to predator risk cues?

study design exp 1

1. green crab in tank of water overnight, it releases chem cues

2. take water and heat up

3. put water in tube and expose with light

exp 1 results

less exposed cercarial species when exposed to crab

• they stay inside snail as protective response

exp 2 question

Does this response vary with predator identity?

exp 2 design

same experiment, but add another tank with asian shoe crab from

exp 2 result

even more of a decrease in shedding

exp 3 question

Does R. roscovita respond to transmission opportunity?

exp 3 design

same experiment but one tank mussles and another tank mussels and crab

• mussel and crab is most realistic to actual environment

exp 3 result

even more of a decrease in shedding

conculsion

Predation risk decreases parasite transmission for R. roscovita and C. lingua

• Risk suppression of parasite transmission depends on predator identity

• R. roscovita does exhibit host seeking behavior when exposed to transmission opportunity