Canada Research Professor, Carleton University

Professor of Ecology, Universidade Estadual de Maringá - Brazil

Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences

Norwegian Institute for Nature Research,

Senior Research Fellow, University of Western Australia

Professor Emeritus, University of Maryland Center for Environmental Science

University of Adelaide

Professor Ecological Modelling, Fish Ecology, Université Toulouse Paul Sabatier

MARBEC, Université de Montepllier, CNRS

Professor of Ecology, Institute of Aquatic Ecology, University of Girona, Girona, Catalonia …