Influence of forest cover on tadpole vital rates in two tropical treefrogs

Tanya J. Hawley

Research output: Contribution to journalArticlepeer-review


The vital rates of anuran tadpoles inhabiting ephemeral pools may be influenced by the amount of forest cover. To better understand this topic in a tropical system, I compared the vital rates of tadpoles of the treefrogs Agalychnis callidryas and Dendropsophus ebraccata in pools with different extents of forest cover in the Osa Peninsula, Costa Rica. I used a randomized block design, with artificial pools in pasture, edge, and forest, to measure the growth, development, and survival of tadpoles within each habitat. I assessed abiotic conditions in each forest-cover treatment by quantifying the light environment, water temperature, and dissolved oxygen content. Pasture-light environments were open with few obstructions, whereas edge- and forest-light environments were closed, with a complex vegetation structure obstructing solar radiation. Water temperature was strongly correlated with the amount of light contacting the ground in each forest-cover treatment. Tadpoles of both species grew larger in pasture than in forest. Survival of A. callidryas was lower in pasture (42%) than in edge and forest ( 90%), whereas survival of D. ebraccata was high in all forest-cover treatments ( 87%). These results suggest that the use of pasture pools for breeding represents a trade-off for some species, such that tadpoles have reduced survival but gain fitness benefits of faster growth compared to tadpoles in edge and forest pools. Water temperature may be the primary factor responsible for interspecific and intraspecific variation in tadpole performance across tropical forest-cover gradients.
Original languageEnglish (US)
Pages (from-to)233-240
Number of pages8
JournalHerpetological Conservation and Biology
Issue number2
StatePublished - 2010


  • INHS
  • Abiotic conditions
  • Conservation
  • Forest cover
  • Dendropsophus ebraccata
  • Tropical pasture
  • Agalychnis callidryas
  • Amphibian

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology


Dive into the research topics of 'Influence of forest cover on tadpole vital rates in two tropical treefrogs'. Together they form a unique fingerprint.

Cite this