1. a School of Biological Sciences , University of Manchester , Manchester, UK
2. f School of Biological Sciences , University of Manchester , G.38 Stopford Building, Manchester, M13 9PT, UK
3. b Department of Stress Research , Karolinska Institute , Stockholm, Sweden
4. c Department of Physiology , University of Leiden , Leiden, The Netherlands
5. d Department of Biological Sciences , Metropolitan University of Manchester , Manchester, UK
6. e Institute of Zoology , Martin Luther University of Hallé , Germany