Data from a national butterfly monitoring scheme were analysed to test the theory that animal populations are more variable towards the edges of species ranges Nine of the 24 species tested fluctuated with significantly greater amplitude nearer their northern limits, providing the first clear evidence of this phenomenon among ectotherms With some species, the pattern of fluctuations also varied across ranges with populations increasing and decreasing more gradually, and perhaps cyclically, over several generations in the north.
BT - Ecography DA - 1994 DB - Wiley Online Library DO - 10.1111/j.1600-0587.1994.tb00096.x IS - 3 LA - en N2 -Data from a national butterfly monitoring scheme were analysed to test the theory that animal populations are more variable towards the edges of species ranges Nine of the 24 species tested fluctuated with significantly greater amplitude nearer their northern limits, providing the first clear evidence of this phenomenon among ectotherms With some species, the pattern of fluctuations also varied across ranges with populations increasing and decreasing more gradually, and perhaps cyclically, over several generations in the north.
PY - 1994 SN - 1600-0587 SP - 215 EP - 220 T2 - Ecography TI - Increased fluctuations of butterfly populations towards the northern edges of species' ranges VL - 17 Y2 - 2013-07-15 14:44:48 ER -