Amaël Borzée,
Yikweon Jang

Reference to article

Borzée A., Jang Y. 2018. Interference competition driven by hydric stress in Korean Hylids. Nature Conservation Research 3(Suppl.1). DOI: 10.24189/ncr.2018.008

Section Short Communications

Competition is based on the type and importance of the resource sought, and interactions intensify with the importance of a given resource. One of the highest degrees of interference competition is physical interactions for a given resource. The treefrogs Dryophytes japonicus and D. suweonensis compete for spatial resources for the production of advertisement calls. Here, we have investigated a case of direct interference competition due to artificial hydric stress caused by variations in the irrigation system of rice paddies. Under this specific condition, an unusually high number of males of both species congregated in a single flooded field. We first found that males segregated following a demonstrated pattern, with D. japonicus on the edges and D. suweonensis at the centre of the submerged field. However, the differences in the distance to the edge of the submerged field for amplexuses of the two species were not significantly different. Due to the high number of individuals and the small size of the site, the area used by males of both species partly overlapped, and thus lead to physical interactions between two males of the two species. Dryophytes japonicus took over a calling site and managed to remove the opponent male. We sequentially described the interaction here, potentially representative of the general outcome of interference competition between these two species.


Dryophytes japonicus, Dryophytes suweonensis, interference competition, Korean Hylids, physical fight

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Received: 14.10.2017

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Beebee T.J. 1991. Purification of an agent causing growth inhibition in anuran larvae and its identification as a unicellular unpigmented alga. Canadian Journal of Zoology 69(8): 2146–2153. DOI: 10.1139/z91-300
Begon M., Townsend C.R., Harper J.L. 2006. Ecology: from individuals to ecosystems. Oxford: Blackwell Publishing.
Borzée A., Park S., Kim A., Kim H.-T., Jang Y. 2013. Morphometrics of two sympatric species of tree frogs in Korea: a morphological key for the critically endangered Hyla suweonensis in relation to H. japonica. Animal Cells and Systems 17(5): 348–356. DOI: 10.1080/19768354.2013.842931
Borzée A., Jang Y. 2015. Description of a seminatural habitat of the endangered Suweon treefrog, Hyla suweonensis. Animal Cells and Systems 19(3): 1–5. DOI: 10.1080/19768354.2015.1028442
Borzée A., Kim J.Y., Da Cunha M.A.M., Lee D., Sin E., Oh S., Yi Y., Jang Y. 2016a. Temporal and spatial differentiation in microhabitat use: Implications for reproductive isolation and ecological niche specification. Integrative Zoology 11(5): 375–387. DOI: 10.1111/1749-4877.12200
Borzée A., Kim J.Y., Jang Y. 2016b. Asymmetric competition over calling sites in two closely related treefrog species. Scientific Reports 6: 32569. DOI: 10.1038/srep32569
Borzée A., Kim K., Heo K., Jablonski P.G., Jang Y. 2017. Impact of land reclamation and agricultural water regime on the distribution and conservation status of the endangered Dryophytes suweonensis. PeerJ 5: e3872. DOI: 10.7717/peerj.3872
Byrne P.G., Keogh J.S. 2009. Extreme sequential polyandry insures against nest failure in a frog. Proceedings of the Royal Society of London B: Biological Sciences 276(1654): 115–120. DOI: 10.1098/rspb.2008.0794
Duellman W.E., Marion A.B., Hedges S.B. 2016. Phylogenetics, classification, and biogeography of the treefrogs (Amphibia: Anura: Arboranae). Zootaxa 4104(1): 1–109. DOI: 10.11646/zootaxa.4104.1.1
Grant P.R., Grant B.R. 2002. Adaptive radiation of Darwin's finches: Recent data help explain how this famous group of Galapagos birds evolved, although gaps in our understanding remain. American Scientist 90(2): 130–139.
Griffiths R.A., Edgar P., Wong A.-C. 1991. Interspecific competition in tadpoles: growth inhibition and growth retrieval in natterjack toads, Bufo calamita. The Journal of Animal Ecology 60(3): 1065–1076. DOI: 10.2307/5431
Kim M.Y. 2015. Testing exploitative competition of calling sites between sympatric hylid species in Korea. MSc. Thesis. Seoul: Ewha Womans University.
Kim Y.E. 2016. Differential antipredator behavior between Hyla japonica and H. suweonensis suggests separate evolution. MSc. Thesis. Seoul: Ewha Womans University.
Lack D. 1947. Darwin's Finches. Cambridge, UK: Cambridge University Press.
Parris M.J., Semlitsch R.D. 1998. Asymmetric competition in larval amphibian communities: conservation implications for the northern crawfish frog, Rana areolata circulosa. Oecologia 116(1–2): 219–226. DOI: 10.1007/PL00013822
Schluter D. 2000. Ecological character displacement in adaptive radiation. American Naturalist 156(S4): 4–16. DOI: 10.1086/303412
Starnberger I., Poth D., Peram P.S., Schulz S., Vences M., Knudsen J., Barej M.F., Rödel M.O., Walzl M., Hödl W. 2013. Take time to smell the frogs: vocal sac glands of reed frogs (Anura: Hyperoliidae) contain species‐specific chemical cocktails. Biological Journal of the Linnean Society 110(4): 828–838. DOI: 10.1111/bij.12167
Steinwascher K. 1978. Interference and exploitation competition among tadpoles of Rana utricularia. Ecology 59(5): 1039–1046. DOI: 10.2307/1938556
Turelli M., Barton N.H., Coyne J.A. 2001. Theory and speciation. Trends in Ecology & Evolution 16(7): 330–343. DOI: 10.1016/S0169-5347(01)02177-2
Walls S.C. 1990. Interference competition in postmetamorphic salamanders: interspecific differences in aggression by coexisting species. Ecology 71(1): 307–314. DOI: 10.2307/1940270
Walls S.C., Jaeger R.G. 1987. Aggression and exploitation as mechanisms of competition in larval salamanders. Canadian Journal of Zoology 65(12): 2938–2944. DOI: 10.1139/z87-446
Yu T., Lambert M. 2015. Conspecific visual cues: the relative importance of interference and exploitation competition among tadpoles of Rana kukunoris. Ethology Ecology & Evolution 29(2): 193–199. DOI: 10.1080/03949370.2015.1092477