Variations in boldness, behavioural and physiological traits of an endangered and a common hylid species from Korea

Amaël Borzée, Ai Yun Yu, Yikweon Jang

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Animal populations with narrow distribution ranges due to recent constrictions are predicted to be physiologically and evolutionarily less fit than their counterparts with wider distributions. In anurans, muscle mass and body size are generally correlated with locomotor and physiological performances. These, in turn, may be representatives of species-specific strategies such as predator avoidance, exploration, habitat use, and dispersal. We conducted behavioural experiments and field observations to assess the differences in physiological capacity, exploratory behaviour, and response delay between the endangered Dryophytes suweonensis and the widespread D. japonicus. The complementary genetic analyses revealed a lower genetic diversity in D. suweonensis than in D. japonicus. Despite its smaller size, D. suweonensis displayed a significantly larger mass for locomotor muscles, but a longer delay for responses to stimulus and a lower endurance than D. japonicus. The combined lower cognitive delay for behavioural responses of D. suweonensis and the better endurance of D. japonicus make the later species more fit to its environment, allowing for faster escape and wider dispersal capabilities. Our results therefore highlight the correlation between the endangered D. suweonensis with a narrow ranges and depressed boldness, in comparison to the widespread and closely related D. japonicus. These results are clade specific, but open a potential new line of research into species decline.

Original languageEnglish
Pages (from-to)515-533
Number of pages19
JournalEthology Ecology and Evolution
Volume30
Issue number6
DOIs
StatePublished - 2 Nov 2018

Bibliographical note

Funding Information:
We are indebted to Han Hyojeong, Jun Young Kim, Oh Seonmin, Sin Euncheong, Lee Donggeun, Kim Mi Yeon and Kim Ye-Eun for their help during field work and without whom this work would not have been possible. This work was supported financially by two research grants from the National Research Foundation of Korea (2017R1A2B2003579) to Y. Jang. The observations in this study comply with the current laws of the Republic of Korea (Ministry of Environment Permits Number: 2013-16; 2015-03, 2015-05, 2015-06, and 2015-28).

Funding Information:
This work was supported by the National Research Foundation of Korea [grant number 2017R1A2B2003579]. We are indebted to Han Hyojeong, Jun Young Kim, Oh Seonmin, Sin Euncheong, Lee Donggeun, Kim Mi Yeon and Kim Ye-Eun for their help during field work and without whom this work would not have been possible. This work was supported financially by two research grants from the National Research Foundation of Korea (2017R1A2B2003579) to Y. Jang. The observations in this study comply with the current laws of the Republic of Korea (Ministry of Environment Permits Number: 2013-16; 2015-03, 2015-05, 2015-06, and 2015-28).

Publisher Copyright:
© 2018, © 2018 Dipartimento di Biologia, Università di Firenze, Italia.

Keywords

  • boldness
  • Dryophytes japonicus
  • Dryophytes suweonensis, treefrog
  • endurance
  • exploration
  • physiological capacities

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