Determinations of Shorebirds Diets during Spring Migration Stopovers in Korean Rice Fields

Nam, Hyung-Kyu; Kim, Myung‐Hyun

doi:10.11626/kjeb.2017.35.4.452

Cited by 9 publications

(2 citation statements)

References 36 publications

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“…Second, both areas are farmlands irrigated before planting. By the time of the arrival of waders, such as P. falcinellus, most rice paddies in the country have already been irrigated and farming activities, such as plowing, have taken place, forming various types of physical structures and providing important foraging sites for the species (Choi et al 2014;Nam and Kim 2017). For P. falcinellus, which was in need of animal diets, the farmlands were the optimal places for eating them.…”

Section: Discussionmentioning

confidence: 99%

Re-emergence of the Glossy Ibis (Plegadis falcinellus) in inland South Korea

Lee

Sung

Han³

et al. 2020

j ecology environ

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Glossy Ibis (Plegadis falcinellus), which has never been recorded in South Korea, appeared on Jeju Island in 2018 and re-emerged in the inland area of Seocheon-gun (South Chungcheong Province) and in Goyang-si (Gyeonggi Province) in the following year. This study aims to report the progress in observing P. falcinellus in the inland areas of South Korea in 2019 and to predict its origin region and future propensity for habitats in the country through literature review. On 5 May 2019, an individual of P. falcinellus with breeding feathers was observed in a farmland in Wolsan-ri, Seocheon-gun. Twelve days later, another one was identified in a farmland in Janghang-dong, Goyang-si, about 173 km north of Wolsan-ri. The observed birds fed and rested in the area and stayed for only a day. The individual birds spotted in South Korea in 2019 are conjectured to have come from either Southeast Asia or Australia, among areas located in East Asian-Australasian Flyway (EAAF). This is because P. falcinellus, a species with excellent dispersal capacity, forms a population in new areas during extreme environmental changes in their current habitats, especially droughts. For 2 years, P. falcinellus was observed to be migrating in spring; however, in the future, they may exhibit the same propensity for breeding and habitats as that of birds migrating in autumn. As it is a conspicuous species, effective detection of their arrival requires a survey system that classifies the country by habitat type and involves periodic and multiple observations by experts and citizens.

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Section: Discussionmentioning

confidence: 99%

Re-emergence of the Glossy Ibis (Plegadis falcinellus) in inland South Korea

Lee

Sung

Han³

et al. 2020

j ecology environ

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“…In the coastal region of the Gyeonggi Province, where most breeding colonies of spoonbills are located, the loss of foraging habitat is much more severe due to the expansion of metropolitan areas [98,99]. In addition to the decline in foraging habitat area, heavy use of agrochemicals is likely to have reduced the diversity and abundance of potential prey, such as fish and invertebrates, in rice paddies and around wetlands [100][101][102].…”

Section: Plos Onementioning

confidence: 99%

Age-dependent shifts and spatial variation in the diet of endangered Black-faced Spoonbill (Platalea minor) chicks

et al. 2021

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The endangered Black-faced Spoonbill (Platalea minor) strictly breeds in marine environments and is threatened by the rapid loss of coastal wetlands within its breeding range. Adults with chicks are thought to gradually switch feeding sites from freshwater wetlands to coastal mudflats as the chicks’ osmoregulatory system develops. We investigated age-dependent shifts in the diet of Black-faced Spoonbill chicks at four breeding colonies with varying freshwater habitat availability by examining stable isotopes (δ13C, δ15N) between the tip (grown at the age of 10 days) and middle (grown at the age of 22 days) portions of their primary feathers. The δ13C value of the middle portions was significantly higher than that of the tips, which suggested that the ratio of marine resources increased with the growth and development of chicks. A Bayesian isotope mixing model revealed that the diet proportion of marine prey in the early-chick rearing season was slightly higher than in the late-chick rearing season at three colonies in inshore areas, although this proportion was approximately 60% even in the early chick-rearing period. In contrast, isotopic values and reconstructed diet composition suggested that chicks in an offshore colony with limited freshwater wetlands relied more heavily on freshwater diets for both chick-rearing periods (>80%). Our results suggest that the shifts in feeding sites seen in previous studies might be related to the age-dependent dietary shift of chicks, highlighting the importance of freshwater wetlands for spoonbills on offshore islands without an inflow of freshwater in nearby intertidal mudflats. These findings emphasize the importance of freshwater prey and wetlands even for the endangered marine-breeding spoonbills, even though the negative impact of salt stress remains inconclusive.

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