Document Type

Article

Publication Date

November 2012

Publication Title

The Journal of Experimental Biology

Volume

215

Issue Number

24

First Page

4374

Last Page

4384

DOI

10.1242/jeb.075317

ISSN

1477-9145

Keywords

Foraging, raptorial appendage, Stomatopoda, Crustacea, Kinematics, Morphology, sit-and-wait predator

Disciplines

Anatomy | Aquaculture and Fisheries | Biology | Terrestrial and Aquatic Ecology | Zoology

Abstract

Ambush predation is characterized by an animal scanning the environment from a concealed position and then rapidly executing a surprise attack. Mantis shrimp (Stomatopoda) consist of both ambush predators (‘spearers’) and foragers (‘smashers’). Spearers hide in sandy burrows and capture evasive prey, whereas smashers search for prey away from their burrows and typically hammer hard-shelled, sedentary prey. Here, we examined the kinematics, morphology and field behavior of spearing mantis shrimp and compared them with previously studied smashers. Using two species with dramatically different adult sizes, we found that strikes produced by the diminutive species, Alachosquilla vicina, were faster (mean peak speed 5.72±0.91 m s–1; mean duration 3.26±0.41 ms) than the strikes produced by the large species, Lysiosquillina maculata (mean peak speed 2.30±0.85 m s–1; mean duration 24.98±9.68 ms). Micro-computed tomography and dissections showed that both species have the spring and latch structures that are used in other species for producing a spring-loaded strike; however, kinematic analyses indicated that only A. vicina consistently engages the elastic mechanism. In the field, L. maculata ambushed evasive prey primarily at night while hidden in burrows, striking with both long and short durations compared with laboratory videos. We expected ambush predators to strike with very high speeds, yet instead we found that these spearing mantis shrimp struck more slowly and with longer durations than smashers. Nonetheless, the strikes of spearers occurred at similar speeds and durations to those of other aquatic predators of evasive prey. Although counterintuitive, these findings suggest that ambush predators do not actually need to produce extremely high speeds, and that the very fastest predators are using speed to achieve other mechanical feats, such as producing large impact forces.

Comments

This article was published in the Journal of Experimental Biology, vol. 215 no. 24, 4374-4384, 2012. It is also available online at the following link https://doi.org/10.1242/jeb.075317. Supplementary material available online at http://jeb.biologists.org/cgi/content/full/215/24/4374/DC1.

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