@article{248,
  author = {Pollard E.},
  title = {Synchrony of Population Fluctuations: The Dominant Influence of Widespread Factors on Local Butterfly Populations},
  abstract = {Fluctuations in the abundance of butterflies at many sites in Britain are monitored in a national scheme. Both annual fluctuations and long term trends at individual sites are often very closely synchronised with regional data which excludes the study sites. I argue from such synchrony: (1) that these population are likely to be limited by density-dependent factors and (2) that population fluctuations are little influenced by interactions which are specific to local communities.},
  year = {1991},
  journal = {Oikos},
  volume = {60},
  pages = {7-10},
  month = {February 1, 1991},
  isbn = {0030-1299},
  url = {http://www.jstor.org/stable/3544985},
  language = {eng},
}