Some Ecological Observations of Rana ishikawae, a Rare Frog Endemic to the Ryukyu Islands

Utsunomiya, Yasuaki; Utsunomiya, Taeko; Katsuren, Seiki

doi:10.2183/pjab.55.233

Cited by 4 publications

(5 citation statements)

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“…The estimated suitability map was congruent with the known distribution areas of each species (Utsunomiya, 1995) (Supplementary Figure S3). For O. ishikawae, higher suitability values were also well distributed in the Nago and Motobu areas, where populations had been previously observed, but not since 1993 (Utsunomiya et al, 1979). The assigned probabilities of each variable were also consistent with the current knowledge of O. ishikawae and O. splendida.…”

Section: Enm and Least Cost-path Analysissupporting

confidence: 83%

“…Black, white and gray rectangles in bar graphs also indicate the probabilities in full models, models with a single variable and best-fitting models, respectively. area covered by natural evergreen forest, and their spawning is observed in holes around the river source area (Katsuren et al, 1977;Utsunomiya et al, 1979), while O. splendida similarly dwells in river bed water in mountain areas (Oumi, 2006), covered mainly by secondary evergreen forest (Miyawaki, 1989), and is also found on the border of the forest and on cultivated land (Koba, 1955). However, some models based on single variables showed lower AUC values (Supplementary Table S5), indicating different probability assignments of each variable compared with full models (TWI and watershed in O. ishikawae and slope and TWI in O. splendida) (Figure 2).…”

Section: Enm and Least Cost-path Analysismentioning

confidence: 99%

“…Despite the current knowledge, the ecology of both species is not yet fully understood. With regards to the breeding ecology of O. ishikawae, eggs are typically deposited in water in underground holes located along the slopes of rocky upper streams in forest regions (Katsuren et al, 1977;Utsunomiya et al, 1979). However, the ecology of adults of both species in the non-breeding season has not been revealed due to infrequent observation of individuals (Utsunomiya, 1995).…”

Section: Introductionmentioning

confidence: 99%

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Population structure and landscape genetics of two endangered frog species of genus Odorrana: different scenarios on two islands

Igawa

Oumi²,

Katsuren

et al. 2012

Heredity

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Isolation by distance and landscape connectivity are fundamental factors underlying speciation and evolution. To understand how landscapes affect gene flow and shape population structures, island species provide intrinsic study objects. We investigated the effects of landscapes on the population structure of the endangered frog species, Odorrana ishikawae and O. splendida, which each inhabit an island in southwest Japan. This was done by examining population structure, gene flow and demographic history of each species by analyzing 12 microsatellite loci and exploring causal environmental factors through ecological niche modeling (ENM) and the cost-distance approach. Our results revealed that the limited gene flow and multiple-population structure in O. splendida and the single-population structure in O. ishikawae were maintained after divergence of the species through ancient vicariance between islands. We found that genetic distance correlated with geographic distance between populations of both species. Our landscape genetic analysis revealed that the connectivity of suitable habitats influences gene flow and leads to the formation of specific population structures. In particular, different degrees of topographical complexity between islands are the major determining factor for shaping contrasting population structures of two species. In conclusion, our results illustrate the diversification mechanism of organisms through the interaction with space and environment. Our results also present an ENM approach for identifying the key factors affecting demographic history and population structures of target species, especially endangered species.

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Section: Enm and Least Cost-path Analysissupporting

confidence: 83%

Section: Enm and Least Cost-path Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Population structure and landscape genetics of two endangered frog species of genus Odorrana: different scenarios on two islands

Igawa

Oumi²,

Katsuren

et al. 2012

Heredity

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“…Numerous differences have been observed in the morphological and ecological characters (Utsunomiya et al, 1979), karyotypes (Seto et al, 1984), genetic characters (Matsui et al, 2005;Sumida et al, 2008), and postmating isolation (Kuramoto et al, 2011) of the Amami and Okinawa populations of O. ishikawae. Recently, the Amami population of this species has been described as a new species O. splendida (Kuramoto et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

“…The morphological characteristics and natural breeding habitats of O. ishikawae have been observed in detail in the Okinawa and Amami Islands (e.g., Utsunomiya et al, 1979Utsunomiya et al, , 1983. According to these studies, a male frog typically inhabits a hole along a stream during the breeding season, and invites females to this hole by calling, resulting in nonsynchronous spawning by females.…”

Section: Introductionmentioning

confidence: 99%

Artificial Production and Natural Breeding of the Endangered Frog SpeciesOdorrana ishikawae, with Special Reference to Fauna Conservation in the Laboratory

Sumida¹,

Satou²,

Yoshikawa³

et al. 2011

Zoological Science

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Odorrana ishikawae is listed as a class IB endangered species in the IUCN Red List and is protected by law in both Okinawa and Kagoshima Prefectures, Japan. Here, in an effort to help effectively preserve the genetic diversity of this endangered species in the laboratory, we tested a farming technique involving the artificial breeding of frogs, and also promoted natural breeding in the laboratory. Field-caught male/female pairs of the Amami and Okinawa Island populations were artificially bred using an artificial insemination method in the 2004, 2006, and 2008 breeding seasons (March to April). Although fewer than 50% of the inseminated eggs achieved metamorphosis, approximately 500, 300, and 250 offspring from the three respective trials are currently being raised in the laboratory. During the 2009 and 2010 breeding seasons, second-generation offspring were produced by the natural mating activities of the first offspring derived from the two artificial matings in 2004. The findings and the methods presented here appear to be applicable to the temporary protection of genetic diversity of local populations in which the number of individuals has decreased or the environmental conditions have worsened to levels that frogs are unable to survive by themselves.

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Parental care of underwater egg clutches in Andean water frogs (Anura: Telmatobiidae)

Brunetti,

Muñoz-Saravia,

Barrionuevo

et al. 2024

Can. J. Zool.

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The most generalized reproductive mode in anurans is the deposition of egg clutches in water that develop into exotrophic aquatic tadpoles. Yet, despite this extended distribution, cases of parental care on submerged egg clutches are poorly documented. Because of its high diversity, its aquatic habits, and reports on males of two species standing next to the clutch, the Andean genus Telmatobius Wiegmann, 1834 offers an excellent model to examine the evolution of such behavior and the factors influencing it. Here, we combine field and laboratory studies to describe the breeding biology and parental care behavior on Telmatobius culeus (Garman, 1876), Telmatobius hintoni Parker, 1940, Telmatobius intermedius Vellard, 1951, Telmatobius jelskii (Peters, 1873), and Telmatobius oxycephalus Vellard, 1946. Our findings indicate that these five species have prolonged breeding season, and use concealed underwater shelters between rocks or macrophytes for mating and egg deposition. We showed that clutches of 35–560 eggs are deposited in these shelters. Males were observed next to the egg clutch and defending it aggressively against intruders, including conspecifics. Females were, on average, larger than males supporting the hypothesis that competition among males does not drive sexual size dimorphism in the genus. Our findings provide meaningful data to use in conservation programs, given that most species of Telmatobius are considered endangered and fill a significant information gap in understanding parental care’s origin in Nobleobatrachia.

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Some Ecological Observations of Rana ishikawae, a Rare Frog Endemic to the Ryukyu Islands

Cited by 4 publications

References 1 publication

Population structure and landscape genetics of two endangered frog species of genus Odorrana: different scenarios on two islands

Population structure and landscape genetics of two endangered frog species of genus Odorrana: different scenarios on two islands

Artificial Production and Natural Breeding of the Endangered Frog SpeciesOdorrana ishikawae, with Special Reference to Fauna Conservation in the Laboratory

Parental care of underwater egg clutches in Andean water frogs (Anura: Telmatobiidae)

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