Negative Effects of Deep Roadside Ditches on<i>Pelophylax porosa brevipoda</i>Dispersal and Migration in Comparison with<i>Hyla japonica</i>in a Rice Paddy Area in Japan

Naito, Risa; Sakai, Masaru; Morimoto, Yukihiro

doi:10.2108/zsj.29.599

Cited by 16 publications

(11 citation statements)

References 14 publications

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“…Unlike natural ditches, concrete ditches typically remain dry, which limits grass growth. This finding differs from that of a study in Japan33, in which ditches did not have an effect on the temporal or spatial distribution of anuran species, including H. japonica . However, this study examined the presence of treefrogs in rice paddies, without examining which side of the rice paddies attracted the treefrogs.…”

Section: Discussioncontrasting

confidence: 99%

Asymmetric competition over calling sites in two closely related treefrog species

Borzée

Kim

Jang³

2016

Sci Rep

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Interspecific competition occurs when one species using a resource limits the use of that resource by another species. A dominance relationship between the species competing over a resource may result in asymmetric competition. Here, we tested the hypothesis that two sympatric treefrog species, the endangered Hyla suweonensis and the abundant H. japonica, compete with each other over calling sites. We observed the locations of calling individuals of the two treefrog species in rice paddies and tested whether removing one species affected the calling locations of the other species. Individuals of the two species were spatially isolated within rice paddies, with H. japonica at the edges and H. suweonensis in the interior. Male H. suweonensis moved towards the edges of rice paddies when male H. japonica were removed from the area, whereas male H. japonica hardly moved when male H. suweonensis were removed. The results of both studies are consistent with asymmetric interspecific competition, in which the calling locations of H. suweonensis are affected by the calling activity of H. japonica. In addition, H. japonica were found “sitting” on the substrate during call production, whereas H. suweonensis were “holding” onto vegetation. The difference in calling posture may represent an adaptive response to asymmetric interspecific competition.

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Section: Discussioncontrasting

confidence: 99%

Asymmetric competition over calling sites in two closely related treefrog species

Borzée

Kim

Jang³

2016

Sci Rep

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“…Many artificial waterbodies support species-poor [60] or otherwise undesirable communities or organisms, including disease vectors [58,61,62], and can spread pest species to natural habitats [63,64]. Some have also contributed to, accelerated, or facilitated flow of excess nutrients and other pollutants [65,66], activation of toxicants [58], interrupted desirable species' movement and dispersal [67], increased greenhouse gas emissions [27,68], yielded bad smells [69], and even concealed crime [70]. Other examples of ecosystem disservices proffered by artificial water bodies appear in Table A1.…”

Section: The Condition Of Artificial Aquatic Systems and Its Driversmentioning

confidence: 99%

Artificial Aquatic Ecosystems

Clifford

Heffernan

2018

Water

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Abstract:As humans increasingly alter the surface geomorphology of the Earth, a multitude of artificial aquatic systems have appeared, both deliberately and accidentally. Human modifications to the hydroscape range from alteration of existing waterbodies to construction of new ones. The extent of these systems makes them important and dynamic components of modern landscapes, but their condition and provisioning of ecosystem services by these systems are underexplored, and likely underestimated. Instead of accepting that artificial ecosystems have intrinsically low values, environmental scientists should determine what combination of factors, including setting, planning and construction, subsequent management and policy, and time, impact the condition of these systems. Scientists, social scientists, and policymakers should more thoroughly evaluate whether current study and management of artificial aquatic systems is based on the actual ecological condition of these systems, or judged differently, due to artificiality, and consider resultant possible changes in goals for these systems. The emerging recognition and study of artificial aquatic systems presents an exciting and important opportunity for science and society.

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“…Both treefrog species seemed to avoid rice paddies with concrete ditches, and unlike natural ditches, concrete ditches typically remain dry, which limits grass growth. However, contradicting results were found in Japan (Naito et al 2012 ), in which ditches did not have an effect on the temporal or spatial distribution of anuran species, including D. japonicus . The study by Naito et al ( 2012 ) examined the presence of treefrogs in rice paddies, without examining which side of the rice paddies attracted treefrogs.…”

Section: Discussionmentioning

confidence: 63%

“…However, contradicting results were found in Japan (Naito et al 2012 ), in which ditches did not have an effect on the temporal or spatial distribution of anuran species, including D. japonicus . The study by Naito et al ( 2012 ) examined the presence of treefrogs in rice paddies, without examining which side of the rice paddies attracted treefrogs. Typically, only one side of a rice paddy is bordered by a concrete ditch for irrigation purposes, so frogs can remain close to the sides of rice paddies without concrete ditches.…”

Section: Discussionmentioning

confidence: 63%

Preference for natural borders in rice paddies by two treefrog species

Groffen

Borzée

Jang

2018

Animal Cells and Systems

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In the Republic of Korea, one of the biggest threats to amphibians is habitat modification such as urbanisation and land conversion. With the loss of natural habitats, rice paddies play an important role as substitute habitats for amphibians that originally inhabited wetlands. However, since the 70’s, traditional rice agriculture has been modernised, leading to an increase in the number of concrete ditches and roads bordering rice paddies. This modernisation could have affected the distribution and density of amphibians. In this study, we investigated the preferred position, based on the advertisement calls for two treefrog species (Dryophytes japonicus and D. suweonensis), in relation to different types of borders such as natural ditch, concrete ditch, one-lane dirt road and vegetation. The results show that treefrogs seem to avoid rice paddies with concrete ditches, and with no ditch, which provided no resting microhabitat. The sides of the paddies preferred by the two treefrog species were the ones with vegetation of 30 cm wider or higher, while the two species seemed to avoid the side of paddies with roads. Our results are important for the conservation of anuran species in rice paddies in general as it highlights the need for vegetated areas, preferentially along natural ditches.

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Negative Effects of Deep Roadside Ditches onPelophylax porosa brevipodaDispersal and Migration in Comparison withHyla japonicain a Rice Paddy Area in Japan

Cited by 16 publications

References 14 publications

Asymmetric competition over calling sites in two closely related treefrog species

Asymmetric competition over calling sites in two closely related treefrog species

Artificial Aquatic Ecosystems

Preference for natural borders in rice paddies by two treefrog species

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