The significance of hydroperiod and stand maturity for pool-breeding amphibians in forested landscapes

  • Baldwin R
  • Calhoun A
  • deMaynadier P
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The loss of small seasonal wetlands and adjacent forested habitat is a major threat to pool-breeding amphibians in North America. Identifying environmental correlates of breeding effort (and success) in remaining intact landscapes is a critical first step in conservation planning. Little is known about how pool-breeding amphibian populations respond to fine-scale variations in hydroperiod or neighboring forest structure and composition. We studied these associations for wood frogs (Rana sylvatica LeConte, 1825) and spotted salamanders (Ambystoma maculatum (Shaw, 1802)) in a forested New England landscape (southern Maine, USA). We conducted egg mass counts across two seasons at 87 strictly seasonal pools. The influence of hydroperiod and landscape (150 and 500 m scales) habitat characteristics on breeding effort were investigated. Pools with longer hydroperiods (‡18 weeks post breeding) that were relatively isolated from other breeding wetlands (

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  • R.F. Baldwin

  • A.J.K. Calhoun

  • P.G. deMaynadier

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