PREDATOR NONCONSUMPTIVE EFFECTS ON PREY RECRUITMENT
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<strong>PREDATOR</strong> <strong>N<strong>ON</strong>C<strong>ON</strong>SUMPTIVE</strong> <strong>EFFECTS</strong> <strong>ON</strong> <strong>PREY</strong><br />
<strong>RECRUITMENT</strong><br />
Julius A. Ellrich, Ricardo A. Scrosati, and Markus Molis<br />
All photographs by R. A. Scrosati<br />
Predators may have nonconsumptive effects (NCEs) on prey populations<br />
mediated by chemical cues detected by prey. We experimentally investigated<br />
dogwhelk (Nucella lapillus) NCEs on intertidal barnacle (Semibalanus balanoides)<br />
recruit density in Nova Scotia, Canada. Under a moderate abundance of coastal<br />
phytoplankton (food for barnacle larvae and recruits), barnacle recruitment was<br />
moderate and the nearby presence of dogwhelks limited barnacle recruit density<br />
at the end of the recruitment season. Under a high phytoplankton abundance,<br />
barnacle recruitment was high and neutralized dogwhelk NCEs on barnacle<br />
recruit density, likely through the chemical attraction that recruits exert on<br />
larvae seeking settlement.<br />
478 Bulletin of the Ecological Society of America, 96(3)
Photo 1. Barnacle recruits and predatory dogwhelks on the Atlantic coast of<br />
Nova Scotia, Canada. Photograph by R. A. Scrosati.<br />
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July 2015 479
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Photo 2. Julius Ellrich and experimental cages used to study the nonconsumptive<br />
effects of predatory dogwhelks on barnacle recruitment.<br />
These photographs illustrate the article “Predator nonconsumptive effects on prey recruitment<br />
weaken with recruit density” by Julius A. Ellrich, Ricardo A. Scrosati, and Markus Molis, published<br />
in Ecology 96(3):611–616. http://dx.doi.org/10.1890/14-1856.1<br />
480 Bulletin of the Ecological Society of America, 96(3)
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