Does forest extent affect salamander survival? Evidence from a long-term demographic study of a tropical newt

Anthony LAU, Nancy E. KARRAKER, David DUDGEON*

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)

Abstract

Forest loss has been associated with reduced survival in many vertebrates, and previous research on amphibians has mostly focused on effects at early life stages. Paramesotriton hongkongensis is a tropical newt that breeds in streams but spends up to 10 months per year in terrestrial habitats. Populations are threatened by habitat degradation and collection for the pet trade, but the cryptic terrestrial lifestyle of this newt has limited our understanding of its population ecology, which inhibits development of a species-specific conservation plan. We conducted an eight-year (2007–2014) mark–recapture study on four P. hongkongensis populations in Hong Kong and used these data to evaluate relationships between forest cover, body size, and rainfall on survival and to estimate population sizes. Hong Kong has been subjected to repeated historic territory-wide deforestation, and thus, we wanted to determine whether there was a link between forest extent as a proxy of habitat quality and newt demography. Annual survival was positively associated with forest cover within core habitat of all populations and negatively related to body size. Mean annual survival (~60%) was similar to that of other stream-dwelling amphibians, but varied among years and declined substantially in 2012–2013, perhaps due to illegal collection. Despite the link between forest extent and survival, population sizes declined at the most forested site by 40% and increased by 104% and 134% at two others. Forest protection and consequential secondary succession during recent decades in Hong Kong may have been responsible for persistence of P. hongkongensis populations.

Original languageEnglish
Pages (from-to)10963-10973
Number of pages11
JournalEcology and Evolution
Volume7
Issue number24
Early online date12 Nov 2017
DOIs
Publication statusPublished - Dec 2017
Externally publishedYes

Keywords

  • Core terrestrial habitat
  • mark–recapture
  • Paramesotriton hongkongensis
  • robust design
  • Salamandridae

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