Trees may signal drought through cavitation sound audible to pest insects

Evidence

In 1987 Mattson and Haack (1987) advanced the hypothesis that drought-stressed trees could produce a cavitation sound audible to plant-eating insects. It is not clear if the bark beetles are able to listen to the sounds produced by trees, but in many insects the capacity to capture ultrasonic signals has been found. For instance, the capacity of some butterflies and moths to escape the echoes emitted by bats has been documented. — Almo Farina, Soundscape Ecology, 792

Categorization

• XREF: Pays off the earlier ch7 claim that bark beetles use tree cell-collapse sounds; this passage flags the plant-hearer evidence as still hypothetical. — connects to: Drought-stressed trees broadcast ultrasound that may attract insect pests. — Bernie Krause and Almo Farina, Using Ecoacoustic Methods to Survey the…, 83; Drought-stressed plants emit cell-collapse sounds bark beetles use to locate trees. — Almo Farina, Soundscape Ecology: Principles,…, 360; Bark beetles combine long-range chemical with short-range acoustic signaling — Almo Farina, Soundscape Ecology: Principles,…, 788 (+1 more)
• recurring: this claim recurs 2 times within its source

Broader Connections

• Bark beetles combine long-range chemical with short-range acoustic signaling #corroborates (0.75) — Almo Farina, Soundscape Ecology, 788
• Sound functions as an ecological resource organisms track for survival #expands (0.72) — Almo Farina, Soundscape Ecology, 248