Factors influencing tadpole deposition site choice in a frog with male parental care: An experimental field study. (20th November 2018)

• Record Type: Journal Article
• Authors: Goyes Vallejos, Johana; Grafe, T. Ulmar; Wells, Kentwood D.
• Editors: Foster, S.
• Is Part Of: Ethology. Volume 125:Number 1(2019)
• Page Start: 29
• Page End: 39
• Publication Date: 2018-11-20
• Subjects: amphibians -- clutch‐partitioning -- conspecifics -- Limnonectes palavanensis -- parental care -- predators; Animal behavior -- Periodicals; 591.5
• DOI: 10.1111/eth.12820
• Languages: English
• ISSNs: 0179-1613

Abstract

Abstract: Parents have evolved a variety of strategies to minimize risks to their offspring, including complex choices regarding suitable rearing sites, based on abiotic and biotic factors, which differentially affect offspring survival. Because availability and quality of these sites are variable, parents may have to choose between immediately available lower‐quality rearing sites or extended search time. In some frog species with larval transport, parents are known to select bodies of water that are free of predators, cannibalistic tadpoles, or intraspecific competitors for larval deposition and rearing sites. We tested whether abiotic factors and the presence of predators and conspecific tadpoles affect tadpole deposition behavior in a population of smooth guardian frog, Limnonectes palavanensis, on the island of Borneo. Females lay eggs on land and males guard them until they hatch; after hatching, tadpoles climb onto the male's back and are subsequently transported to small pools of water on the forest floor, which are scarce and patchily distributed. We estimated the abundance of natural tadpole rearing sites in our study area and conducted experiments using artificial pools to test whether abiotic characteristics of these pools affect the probability of larval deposition. We also performed choice experiments to test whether males of L. palavanensis avoid pools with conspecific tadpoles or predators. Lastly, we tested whether the tadpoles of this species exhibit cannibalism. The abundance of natural deposition sites was low, and males readily used artificial pools for tadpole deposition. Males were less likely to deposit tadpoles in artificial pools located in steep areas, and males did not avoid depositing tadpoles in pools with conspecifics or with experimentally introduced predators. Males exhibited clutch‐partitioning behavior, dividing tadpoles between adjacent artificial pools. Pool availability, rather than the presence of potential competitors or predators in a pool, affects tadpole deposition decisions in this species.