Olfactory crypsis and visual attraction in a crab spider
There may be an intense interaction or even an arms race between the crypsis skills of sedentary predators and the detection abilities of prey. We explored the issue using a common crab spider and housefly as the predator and prey, respectively. The results showed that novice houseflies did not, but experienced individuals recognized and avoided spider odor. However, spiders responded such detection excellently by utilizing scent of flower substrates to achieve olfactory crypsis. Houseflies could distinguish between the color of spider body against flower, but they preferred rather than avoided the flowers occupied by female spider. This phenomenon may because that the yellow pattern of female spider abdomen act as attractant on white flower petal. Overall, the data provide evidence for the olfactory crypsis of spider, and propose a new potential yellow signaling mechanism for spiders to attract insects.
Steps to reproduce
We got the data by (a) conducting an odor-choice behavioral experiment using a Y-tube olfactometer, (b) conducting an exit-choice behavioral experiment using a tunnel device, and (c) performing reflectance measureing and visual modelling.
National Science and Technology Basic Research Program of China
State Key Project of Research and Development Plan
Frontier Projects of Applied Foundation of Wuhan Science and Technology Bureau