作者单位:Univ New Brunswick, Canadian River Inst, Fredericton, NB E3B 5A3, Canada[1]Univ Victoria, Dept Biol, Victoria, BC V8W 2Y2, Canada[2]Mt Allison Univ, Dept Biol, Sackville, NB E4L 1G7, Canada[3]Univ New Brunswick, Dept Civil Engn, Fredericton, NB E3B 5A3, Canada[4]Univ New Brunswick, Dept Biol, Fredericton, NB E3B 5A3, Canada[5]