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

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&...

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Autores principales:	Min-Su Jeong, Chang-Young Choi, Woo-Shin Lee, Ki-Sup Lee
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/7fc2403e7e824a38a29f8fce9c76c747
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spelling	oai:doaj.org-article:7fc2403e7e824a38a29f8fce9c76c7472021-12-02T20:09:26ZAge-dependent shifts and spatial variation in the diet of endangered Black-faced Spoonbill (Platalea minor) chicks.1932-620310.1371/journal.pone.0253469https://doaj.org/article/7fc2403e7e824a38a29f8fce9c76c7472021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0253469https://doaj.org/toc/1932-6203The 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.Min-Su JeongChang-Young ChoiWoo-Shin LeeKi-Sup LeePublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 7, p e0253469 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Min-Su Jeong Chang-Young Choi Woo-Shin Lee Ki-Sup Lee Age-dependent shifts and spatial variation in the diet of endangered Black-faced Spoonbill (Platalea minor) chicks.
description	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.
format	article
author	Min-Su Jeong Chang-Young Choi Woo-Shin Lee Ki-Sup Lee
author_facet	Min-Su Jeong Chang-Young Choi Woo-Shin Lee Ki-Sup Lee
author_sort	Min-Su Jeong
title	Age-dependent shifts and spatial variation in the diet of endangered Black-faced Spoonbill (Platalea minor) chicks.
title_short	Age-dependent shifts and spatial variation in the diet of endangered Black-faced Spoonbill (Platalea minor) chicks.
title_full	Age-dependent shifts and spatial variation in the diet of endangered Black-faced Spoonbill (Platalea minor) chicks.
title_fullStr	Age-dependent shifts and spatial variation in the diet of endangered Black-faced Spoonbill (Platalea minor) chicks.
title_full_unstemmed	Age-dependent shifts and spatial variation in the diet of endangered Black-faced Spoonbill (Platalea minor) chicks.
title_sort	age-dependent shifts and spatial variation in the diet of endangered black-faced spoonbill (platalea minor) chicks.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/7fc2403e7e824a38a29f8fce9c76c747
work_keys_str_mv	AT minsujeong agedependentshiftsandspatialvariationinthedietofendangeredblackfacedspoonbillplataleaminorchicks AT changyoungchoi agedependentshiftsandspatialvariationinthedietofendangeredblackfacedspoonbillplataleaminorchicks AT wooshinlee agedependentshiftsandspatialvariationinthedietofendangeredblackfacedspoonbillplataleaminorchicks AT kisuplee agedependentshiftsandspatialvariationinthedietofendangeredblackfacedspoonbillplataleaminorchicks
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Age-dependent shifts and spatial variation in the diet of endangered Black-faced Spoonbill (Platalea minor) chicks.

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