MEPS 502:157-167 (2014)  -  doi:10.3354/meps10703

Ocean acidification affects predator avoidance behaviour but not prey detection in the early ontogeny of a keystone species

Patricio H. Manríquez1,*, María Elisa Jara1, María Loreto Mardones1, Rodrigo Torres2, Jorge M. Navarro1, Marco A. Lardies3, Cristian A. Vargas4, Cristián Duarte5, Nelson A. Lagos6

1Instituto de Ciencias Marinas y Limnológicas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
2Centro de Investigación en Ecosistemas de la Patagonia (CIEP), Coyhaique, Chile
3Facultad de Artes Liberales, Universidad Adolfo Ibáñez, Santiago, Chile
4Laboratorio de Funcionamiento de Ecosistemas Acuáticos, Centro de Ciencias Ambientales, Universidad de Concepción, Concepción, Chile
5Facultad de Ecología y Recursos Naturales, Departamento de Ecología y Biodiversidad, Universidad Andrés Bello, Santiago, Chile
6Facultad de Ciencias, Universidad Santo Tomás, Santiago, Chile
7Present address: Laboratorio de Ecología y Conducta de la Ontogenia Temprana (LECOT), Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Avenida Ossandón 877, Coquimbo, Chile
*Corresponding author:

ABSTRACT: In a series of laboratory Y-maze experiments, we investigated the directional response of juveniles of the muricid snail Concholepas concholepas, a rocky-shore keystone predator characteristic of the southeastern Pacific coast, in displaying prey detection and predator escape behaviour after 5 mo rearing under contrasting levels of pCO2: 390 (present-day), 700 and 1000 µatm CO2 (as expected in near-future scenarios of ocean acidification [OA]). Regardless of the experimental condition, juveniles significantly chose the Y-maze arm containing prey. In general terms, the directions of the displacement paths of the snails in the Y-maze were straight from the starting point to the final position, where the prey items were offered. Moreover, juveniles reared at present-day concentrations and 700 µatm CO2 significantly avoided displacement in the Y-maze arm receiving predator odours. This predator-avoidance behaviour was disrupted in juveniles reared at 1000 µatm CO2. In most cases, displacements recorded under such conditions were sinuous, and the trial individuals did not significantly choose the predator-free arm. In contrast, displacement paths recorded for snails reared at present-day concentrations and at 700 µatm CO2 were straight from the initial to the final position, with displacements mostly ending near the prey and in the arm free of cues associated with predation. The loss of responses to a natural predator under high pCO2 levels in the early ontogeny of C. concholepas may result in ecologically deleterious decisions by this keystone species. We conclude that the negative effects of OA on the chemosensory behaviour of keystone species could have negative consequences for community dynamics.

KEY WORDS: Y-maze · Chemoreception · Decision-making · Early ontogeny · Mucous trail · pH · Concholepas concholepas

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Cite this article as: Manríquez PH, Jara ME, Mardones ML, Torres R and others (2014) Ocean acidification affects predator avoidance behaviour but not prey detection in the early ontogeny of a keystone species. Mar Ecol Prog Ser 502:157-167

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