Column: Sado Wrinkled Frog: An Alternative Symbol for Wildlife-Friendly Farming on Sado Island?

Kobayashi, Raita

doi:10.1007/978-4-431-55330-4_8

Cited by 6 publications

(5 citation statements)

References 5 publications

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“…On the plains, approximately 5.0 km 2 of biotope are reserved for the Ibis, and use of pesticides and chemical fertilizer has been reduced to less than half of that used in conventional rice farming in all paddy fields. Moreover, farmers are prohibited from the use of neonicotinoid pesticides and ridge‐side herbicides and have installed fishways and ditches in the paddy fields where the Ibis forages (Kato 2014, Kobayashi 2014, Usio et al . 2014).…”

Section: Methodsmentioning

confidence: 99%

Evaluation of ongoing Crested Ibis (Nipponia nippon) reintroduction using an integrated population model and Bayesian population viability analysis

Okahisa

Nagata

2022

Ibis

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Reintroduction has often been used as a technique for re-establishing self-sustaining animal populations that have become extinct within their indigenous range. To achieve conservation success, it is essential to accurately assess the demographic parameters and the IUCN Red List criteria of the population. However, acquiring data on all indicators and estimating criteria according to established definitions can be challenging. Here, we developed an integrated population model (IPM) and population viability analysis (PVA) framework to estimate all demographic parameters and criteria for a reintroduced population of Crested Ibis Nipponia nippon, and to project population dynamics under a range of release scenarios on Sado Island, Japan. Our IPM-PVA framework integrated roost count and mark-resight data for 415 released and 203 wild-hatched individuals, as well as reproductive performance for a total of 575 pairs. We aimed to assess survival, reproductive success, population size, number of mature individuals and population projection. In the first year after release, the estimated apparent annual survival rate was 0.566 [Bayesian credible intervals (CRI) 0.518-0.614]; however, this rate increased after 1 year (0.865; CRI 0.836-0.892). Wild-hatched juveniles exhibited a high survival rate (0.757; CRI 0.670-0.838) that was just lower than that of adults (0.899; CRI 0.844-0.949). The reproductive success rate varied with pair attributes . Total population size was estimated to be 457 individuals (CRI 384-525), with 261 mature individuals (CRI 211-304) in June 2021. The probability of Crested Ibis extinction in the next five generations was 0%, even if the release was discontinued. Our comprehensive case study demonstrated the effectiveness of IPM-PVA for the evaluation of ongoing reintroduction programmes.

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Section: Methodsmentioning

confidence: 99%

Evaluation of ongoing Crested Ibis (Nipponia nippon) reintroduction using an integrated population model and Bayesian population viability analysis

Okahisa

Nagata

2022

Ibis

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“…On Daishan Island, most rice paddy fields are dry for part or all of the winter or dry season (Wang and Li, 2009). On the other hand, on Sado Island, winter flooding of rice paddy fields and the construction of swales (shallow, unconsolidated diversion ditches in rice fields; called "e" in Japanese) have been applied as a refuge for aquatic organisms including Sado wrinkled frogs in winter and mid-summer (Kobayashi, 2014;Taqumori et al, 2020). American bullfrogs feed on a wide variety of organisms, comprising mainly aquatic organisms (Hirai, 2004;Dontchev and Matsui, 2016;Sarashina and Yoshida, 2021), and they are frequently observed in wet paddy rice fields with deep water in rice paddy areas (Minowa et al, 2008).…”

Section: Habitat Pond Characteristicmentioning

confidence: 99%

“…2), and the ponds they use for habitat are deeper ponds surrounded by rice paddy fields in areas where their potential distribution probability exceeds 50% (Table 1). Sado wrinkled frogs oviposit from June to August and metamorphose from June to August of the following year (Sekiya et al, 2012;Kobayashi, 2014). In addition, they are found in wetlands, such as rice paddy fields, biotopes, and farm ponds and are considered to be adapted to a rice paddy field environment (Kobayashi, 2014).…”

Section: Conservation Of Sado Wrinkled Frogsmentioning

confidence: 99%

“…Sado wrinkled frogs oviposit from June to August and metamorphose from June to August of the following year (Sekiya et al, 2012;Kobayashi, 2014). In addition, they are found in wetlands, such as rice paddy fields, biotopes, and farm ponds and are considered to be adapted to a rice paddy field environment (Kobayashi, 2014). Therefore, the breeding seasons of invasive American bullfrogs and Sado wrinkled frogs overlap, and they use a similar landscape.…”

Section: Conservation Of Sado Wrinkled Frogsmentioning

confidence: 99%

“…As the American bullfrog primarily preys on aquatic organisms (Hirai, 2004;Sarashina and Yoshida, 2021), concerns arise about its impact on native aquatic species. In particular, the Sado wrinkled frog Glandirana susurra (Sekiya et al, 2012) is at high risk due to its potential ecological trait overlap (Kobayashi, 2014;Kishimoto and Mitsuo, 2020) and susceptibility to predation by American bullfrogs (Wu et al, 2005;Kobayashi, 2014). Thus, considering the conservation of island biodiversity, prioritizing the Sado wrinkled frogs is crucial which requires understanding the timing and characteristics of water bodies exploited by the invasive American bullfrogs.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal Emergence and Habitat Pond Use of Invasive American Bullfrog, Lithobates catesbeianus, on Sado Island, Japan

Sawada,

Kamijo

2024

Current Herpetology

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The American bullfrog Lithobates catesbeianus is a well-known invasive alien species recorded in over 40 countries and islands. It is necessary to elucidate their seasonal emergence and habitat water body characteristics for implementing efficient eradication activities. Sado Island, Japan, is home to several endemic and rare species, including the endangered Sado wrinkled frogs (Glandirana susurra) that are concerned to be negatively impacted by invasive American bullfrogs. Here, we surveyed 41 ponds for invasive American bullfrogs over the period preceding emergence to the start of oviposition to determine their seasonal emergence and habitat pond use. As in previous studies, we observed initiations of their post-hibernation activities such as emergence, mating call, and oviposition in that order as air temperature increased, and those activities were thought to begin as late as late-April, mid-May, and mid-July, respectively on Sado Island. For their habitat preferences, we confirmed that they mainly inhabit relatively deep ponds surrounded by rice paddy fields. Our results were broadly consistent with those of previous studies, with respect to the seasonal emergence and habitat pond characteristics of American bullfrogs on Sado Island. Since our results suggest an overlap in habitat and pond usage season between American bullfrogs and Sado wrinkled frogs, we highly recommend implementing bullfrog eradication activities to conserve the Sado wrinkled frog population. This study provided the basic ecological information for selecting appropriate seasons and ponds for implementing bullfrog eradication activities.

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Environmentally Friendly Farming in Japan: Introduction

Usio

2014

Ecological Research Monographs

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Column: Sado Wrinkled Frog: An Alternative Symbol for Wildlife-Friendly Farming on Sado Island?

Cited by 6 publications

References 5 publications

Evaluation of ongoing Crested Ibis (Nipponia nippon) reintroduction using an integrated population model and Bayesian population viability analysis

Evaluation of ongoing Crested Ibis (Nipponia nippon) reintroduction using an integrated population model and Bayesian population viability analysis

Seasonal Emergence and Habitat Pond Use of Invasive American Bullfrog, Lithobates catesbeianus, on Sado Island, Japan

Environmentally Friendly Farming in Japan: Introduction

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