1 Department of Biology, University of Prince Edward Island, Charlottetown, PE, Canada. Electronic address: pquijon@upei.ca.
2 Department of Biology, University of Prince Edward Island, Charlottetown, PE, Canada.
3 Departamento de Ecología y Biodiversidad, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, Santiago, Chile; Center for the Study of Multiple-drivers on Marine Socio-ecological Systems, Universidad de Concepción, Concepción, Chile.