The Journal of Animal Ecology Volume 56

723-1092 hal,;ill,;21 c

The Journal of ecology.

Vols. 16-21 include supplement: British empire vegetation abstracts.Mode of access: Internet.Edited for the British Ecological Society.Vols. 1-20, 1913-1932

The Role of terrestrial and aquatic organisms in decomposition processes : the 17th symposium of the British Ecological Society, 15-18 April 1975 /

Includes bibliographies and indexes

The ecological impact of estuarine barrages

SIGLEGBUnited Kingdo

Land management The hidden costs

SIGLEAvailable from British Library Document Supply Centre-DSC:m01/12388 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

The release of genetically-engineered organisms

SIGLEGBUnited Kingdo

Ecology 2003

reas for two consecutive breeding seasons. This confirmed a strong spatial structuring within grouse populations, which prevented immigration from neighbouring higherdensity areas. In the second autumn, testosterone was not implanted but the recruitment rate remained significantly lower and cock density continued to decline more on the experimental than on the control areas. 5. The results suggest that cocks continued to be aggressive and to maintain large territories for at least a year after aggressiveness was increased experimentally, and therefore that autumn aggressiveness is influenced by previous territorial contests. 6. The experiment validates key assumptions of the `territorial behaviour' hypothesis for red grouse cycles. Population models in a subsequent paper demonstrate how changes in aggressiveness can cause population cycles. Key-words:experiment, testosterone, territorial behaviour, unstable population dynamics. Journal of Animal Ecology (2003) 72, 1073 --