The impact of anthropogenic food subsidies on a generalist seabird during nestling growth

J. Lenzi, I. González-Bergonzoni, E. Machín, B. Pijanowski, E. Flaherty

Research output: Contribution to journalArticle

Abstract

Anthropogenic food subsidies, such as refuse, are an important driver of animal population changes and gulls heavily forage on this food source. Foraging on refuse during the rearing period could affect the acquisition of resources with potential demographic consequences. Using conventional diet analysis and stable isotopes of δ13C and δ15N of blood of Kelp Gull (Larus dominicanus) nestlings, we studied the variation of the chick growth in response to foraging on refuse on a reproductive colony in the Rio de la Plata Estuary in Uruguay. Using Bayesian mixing models on isotopic data, we estimated the proportion and variation of natural food and refuse in the diet of nestlings. Then, we modelled the variation between the mean posterior densities of the food sources and their standard deviation with the nestling morphometric measurements of different sizes. We found that refuse was gradually delivered to Kelp Gull nestlings during the chick rearing period. Additionally, variation of refuse incorporated into nestling tissues increased with nestlings' size. We propose that parents use more isotopically unique food sources during the nestling growth thereby increasing isotopic diversity. This study highlights the need to improve the current waste management system, which is being reviewed in Uruguay. We believe that decision makers should consider the results of this study, which show that refuse is directly impacting coastal ecosystems through mechanisms poorly explored by the environmental sciences. © 2019 Elsevier B.V.
Original languageEnglish
Pages (from-to)546-553
Number of pages8
JournalScience of the Total Environment
Volume687
DOIs
Publication statusPublished - 2019
Externally publishedYes

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refuse
nestling
seabird
generalist
food
Nutrition
rearing
Estuaries
Waste management
diet
Isotopes
Ecosystems
Animals
Blood
subsidy
Tissue
waste management
forage
stable isotope
blood

Bibliographical note

Export Date: 20 June 2019

CODEN: STEVA

Correspondence Address: Lenzi, J.; Centro de Investigación y Conservación Marina - CICMAR, Avenida Giannattasio Km 30.5, Uruguay; email: javier.lenzi@cicmar.org

Funding details: Agencia Nacional de Investigación e Innovación

Funding details: Fondo Nacional de Desarrollo Científico, Tecnológico y de Innovación Tecnológica, 11160601

Funding details: Department of Forestry and Natural Resources, Purdue University

Funding details: California Health Care Safety Net Institute

Funding text 1: Thanks to Franco Teixeira de Mello and Alejandro D'Anatro for affording the stable isotope analysis. To Pablo Viera, Ernesto Venini, Matías Barrios, Luis Martínez, and Héctor López for their support during fieldwork activities. To Ilda Gómez, Hebert Gallegos, Rodrigo Barreiro, Armada Nacional Naval, and Servicio de Balizamiento de la Armada for their great support with logistics. Dirección Nacional de Medio Ambiente (DINAMA) and Dirección Nacional de Recursos Acuáticos (DINARA) for the research permits. To Purdue Animal Care and Use Committee for the animal ethics training and permit (protocol number 1706001591). To Idea Wild and Birders' Exchange for providing laboratory and field equipment. To Fernando Campos-Medina and the Fondecyt project no. 11160601 for the support and collaboration during this research. To Verónica Campos for comments and insights of an earlier version of the manuscript. IGB was financially supported by the national system for researchers (SNI) of the National Agency for Research and Innovation (ANII) and the graduate school PEDECIBA in Uruguay. Comments on earlier drafts by Jeffrey Lucas helped to improve the quality of the paper. JL was partially supported by the Department of Forestry and Natural Resources at Purdue University and by a Fulbright-ANII Fellowship. We would like to thank the two anonymous referees that contributed to improve this manuscript.

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Cite this

Lenzi, J. ; González-Bergonzoni, I. ; Machín, E. ; Pijanowski, B. ; Flaherty, E. / The impact of anthropogenic food subsidies on a generalist seabird during nestling growth. In: Science of the Total Environment. 2019 ; Vol. 687. pp. 546-553.
@article{08fab6f12cd54c0e9d419c8f12d628e4,
title = "The impact of anthropogenic food subsidies on a generalist seabird during nestling growth",
abstract = "Anthropogenic food subsidies, such as refuse, are an important driver of animal population changes and gulls heavily forage on this food source. Foraging on refuse during the rearing period could affect the acquisition of resources with potential demographic consequences. Using conventional diet analysis and stable isotopes of δ13C and δ15N of blood of Kelp Gull (Larus dominicanus) nestlings, we studied the variation of the chick growth in response to foraging on refuse on a reproductive colony in the Rio de la Plata Estuary in Uruguay. Using Bayesian mixing models on isotopic data, we estimated the proportion and variation of natural food and refuse in the diet of nestlings. Then, we modelled the variation between the mean posterior densities of the food sources and their standard deviation with the nestling morphometric measurements of different sizes. We found that refuse was gradually delivered to Kelp Gull nestlings during the chick rearing period. Additionally, variation of refuse incorporated into nestling tissues increased with nestlings' size. We propose that parents use more isotopically unique food sources during the nestling growth thereby increasing isotopic diversity. This study highlights the need to improve the current waste management system, which is being reviewed in Uruguay. We believe that decision makers should consider the results of this study, which show that refuse is directly impacting coastal ecosystems through mechanisms poorly explored by the environmental sciences. {\circledC} 2019 Elsevier B.V.",
author = "J. Lenzi and I. Gonz{\'a}lez-Bergonzoni and E. Mach{\'i}n and B. Pijanowski and E. Flaherty",
note = "Export Date: 20 June 2019 CODEN: STEVA Correspondence Address: Lenzi, J.; Centro de Investigaci{\'o}n y Conservaci{\'o}n Marina - CICMAR, Avenida Giannattasio Km 30.5, Uruguay; email: javier.lenzi@cicmar.org Funding details: Agencia Nacional de Investigaci{\'o}n e Innovaci{\'o}n Funding details: Fondo Nacional de Desarrollo Cient{\'i}fico, Tecnol{\'o}gico y de Innovaci{\'o}n Tecnol{\'o}gica, 11160601 Funding details: Department of Forestry and Natural Resources, Purdue University Funding details: California Health Care Safety Net Institute Funding text 1: Thanks to Franco Teixeira de Mello and Alejandro D'Anatro for affording the stable isotope analysis. To Pablo Viera, Ernesto Venini, Mat{\'i}as Barrios, Luis Mart{\'i}nez, and H{\'e}ctor L{\'o}pez for their support during fieldwork activities. To Ilda G{\'o}mez, Hebert Gallegos, Rodrigo Barreiro, Armada Nacional Naval, and Servicio de Balizamiento de la Armada for their great support with logistics. Direcci{\'o}n Nacional de Medio Ambiente (DINAMA) and Direcci{\'o}n Nacional de Recursos Acu{\'a}ticos (DINARA) for the research permits. To Purdue Animal Care and Use Committee for the animal ethics training and permit (protocol number 1706001591). To Idea Wild and Birders' Exchange for providing laboratory and field equipment. To Fernando Campos-Medina and the Fondecyt project no. 11160601 for the support and collaboration during this research. To Ver{\'o}nica Campos for comments and insights of an earlier version of the manuscript. IGB was financially supported by the national system for researchers (SNI) of the National Agency for Research and Innovation (ANII) and the graduate school PEDECIBA in Uruguay. Comments on earlier drafts by Jeffrey Lucas helped to improve the quality of the paper. JL was partially supported by the Department of Forestry and Natural Resources at Purdue University and by a Fulbright-ANII Fellowship. We would like to thank the two anonymous referees that contributed to improve this manuscript. References: Akaike, H., Information theory as an extension of the maximum likelihood principle (1973) Proceedings of the Second International Symposium on Information Theory, Akademiai Kiado, Budapest, pp. 267-281. , B.N. Petrov F. Csaki; Annett, C.A., Pierotti, R., Chick hatching as a trigger for dietary switching in the Western Gull (1989) Colonial Waterbirds, 12, pp. 4-11; Annett, C.A., Pierotti, R., Long-term reproductive output in Western gulls: consequences of alternate tactics in diet choice (1999) Ecology, 80, pp. 288-297; Anza, I., Vidal, D., Laguna, C., D{\'i}az-S{\'a}nchez, S., S{\'a}nchez, S., Chicote, {\'A}., Flor{\'i}n, M., Mateo, R., Eutrophication and bacterial pathogens as risk factors for avian botulism outbreaks in wetlands receiving effluents from urban wastewater treatment plants (2014) Appl. Environ. Microbiol., 80, pp. 4251-4259; Barrett, R.T., Camphuysen, K.C.J., Anker-Nilssen, T., Chardine, J.W., Furness, R.W., Garthe, S., H{\"u}ppop, O., Veit, R.R., Diet studies of seabirds: a review and recommendations (2007) ICES, 64, pp. 1675-1691; Bearhop, S., Adams, C.E., Waldron, S., Fuller, R.A., Macleod, H., Determining trophic niche width: a novel approach using stable isotope analysis (2004) J. Anim. Ecol., 73, pp. 1007-1012; Belant, J.L., Seamans, T.W., Gabrey, S.W., Ickes, S.K., Importance of landfills to nesting herring gulls (1993) Condor, 95, pp. 817-830; Bertellotti, M., Yorio, P., Spatial and temporal patterns in the diet of the Kelp Gull in Patagonia (1999) Condor, 101, pp. 790-798; Brousseau, P., Lefebvre, J., Giroux, J.-F., Diet of ring-billed Gull chicks in urban and non-urban colonies in Quebec (1996) Colonial Waterbirds, 19, pp. 22-30; Bugoni, L., McGill, R.A., Furness, R.W., Effects of preservation methods on stable isotope signatures in bird tissues (2008) Rapid Commun. Mass Spectrom., 22, pp. 2457-2462; Burger, J., Foraging behavior in gulls: differences in method, prey, and habitat (1988) Colonial Waterbirds, 11, pp. 9-23; Burgues, M.F., Ecolog{\'i}a tr{\'o}fica de la Gaviota Cocinera (Larus dominicanus) en Isla de las Gaviotas (Montevideo, Uruguay). Tesina de grado. Licenciatura en Ciencias. Biol{\'o}gicas. Profundizaci{\'o}n en Ecolog{\'i}a (2015), p. 40. , Facultad de Ciencias, Universidad de la Rep{\'u}blica Montevideo, Uruguay; Campioni, L., Granadeiro, J.P., Catry, P., Niche segregation between immature and adult seabirds: does progressive maturation play a role? (2015) Behav. Ecol., 27, pp. 426-433; Ceia, F.R., Phillips, R.A., Ramos, J.A., Cherel, Y., Vieira, R.P., Richard, P., Xavier, J.C., Short-and long-term consistency in the foraging niche of wandering albatrosses (2012) Mar. Biol., 159, pp. 1581-1591; Ceia, F.R., Paiva, V.H., Fidalgo, V., Morais, L., Baeta, A., Cris{\'o}stomo, P., Mourato, E., Ramos, J.A., Annual and seasonal consistency in the feeding ecology of an opportunistic species, the yellow-legged gull Larus michahellis (2014) Mar. Ecol. Prog. Ser., 497, pp. 273-284; Coulson, R., Coulson, G., Population change among Pacific, Kelp and Silver gulls using natural and artificial feeding sites in south-eastern Tasmania (1998) Wildl. 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year = "2019",
doi = "10.1016/j.scitotenv.2019.05.485",
language = "English",
volume = "687",
pages = "546--553",
journal = "Science of the Total Environment",
issn = "0048-9697",
publisher = "Elsevier",

}

The impact of anthropogenic food subsidies on a generalist seabird during nestling growth. / Lenzi, J.; González-Bergonzoni, I.; Machín, E.; Pijanowski, B.; Flaherty, E.

In: Science of the Total Environment, Vol. 687, 2019, p. 546-553.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The impact of anthropogenic food subsidies on a generalist seabird during nestling growth

AU - Lenzi, J.

AU - González-Bergonzoni, I.

AU - Machín, E.

AU - Pijanowski, B.

AU - Flaherty, E.

N1 - Export Date: 20 June 2019 CODEN: STEVA Correspondence Address: Lenzi, J.; Centro de Investigación y Conservación Marina - CICMAR, Avenida Giannattasio Km 30.5, Uruguay; email: javier.lenzi@cicmar.org Funding details: Agencia Nacional de Investigación e Innovación Funding details: Fondo Nacional de Desarrollo Científico, Tecnológico y de Innovación Tecnológica, 11160601 Funding details: Department of Forestry and Natural Resources, Purdue University Funding details: California Health Care Safety Net Institute Funding text 1: Thanks to Franco Teixeira de Mello and Alejandro D'Anatro for affording the stable isotope analysis. To Pablo Viera, Ernesto Venini, Matías Barrios, Luis Martínez, and Héctor López for their support during fieldwork activities. To Ilda Gómez, Hebert Gallegos, Rodrigo Barreiro, Armada Nacional Naval, and Servicio de Balizamiento de la Armada for their great support with logistics. Dirección Nacional de Medio Ambiente (DINAMA) and Dirección Nacional de Recursos Acuáticos (DINARA) for the research permits. To Purdue Animal Care and Use Committee for the animal ethics training and permit (protocol number 1706001591). To Idea Wild and Birders' Exchange for providing laboratory and field equipment. To Fernando Campos-Medina and the Fondecyt project no. 11160601 for the support and collaboration during this research. To Verónica Campos for comments and insights of an earlier version of the manuscript. IGB was financially supported by the national system for researchers (SNI) of the National Agency for Research and Innovation (ANII) and the graduate school PEDECIBA in Uruguay. Comments on earlier drafts by Jeffrey Lucas helped to improve the quality of the paper. JL was partially supported by the Department of Forestry and Natural Resources at Purdue University and by a Fulbright-ANII Fellowship. 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PY - 2019

Y1 - 2019

N2 - Anthropogenic food subsidies, such as refuse, are an important driver of animal population changes and gulls heavily forage on this food source. Foraging on refuse during the rearing period could affect the acquisition of resources with potential demographic consequences. Using conventional diet analysis and stable isotopes of δ13C and δ15N of blood of Kelp Gull (Larus dominicanus) nestlings, we studied the variation of the chick growth in response to foraging on refuse on a reproductive colony in the Rio de la Plata Estuary in Uruguay. Using Bayesian mixing models on isotopic data, we estimated the proportion and variation of natural food and refuse in the diet of nestlings. Then, we modelled the variation between the mean posterior densities of the food sources and their standard deviation with the nestling morphometric measurements of different sizes. We found that refuse was gradually delivered to Kelp Gull nestlings during the chick rearing period. Additionally, variation of refuse incorporated into nestling tissues increased with nestlings' size. We propose that parents use more isotopically unique food sources during the nestling growth thereby increasing isotopic diversity. This study highlights the need to improve the current waste management system, which is being reviewed in Uruguay. We believe that decision makers should consider the results of this study, which show that refuse is directly impacting coastal ecosystems through mechanisms poorly explored by the environmental sciences. © 2019 Elsevier B.V.

AB - Anthropogenic food subsidies, such as refuse, are an important driver of animal population changes and gulls heavily forage on this food source. Foraging on refuse during the rearing period could affect the acquisition of resources with potential demographic consequences. Using conventional diet analysis and stable isotopes of δ13C and δ15N of blood of Kelp Gull (Larus dominicanus) nestlings, we studied the variation of the chick growth in response to foraging on refuse on a reproductive colony in the Rio de la Plata Estuary in Uruguay. Using Bayesian mixing models on isotopic data, we estimated the proportion and variation of natural food and refuse in the diet of nestlings. Then, we modelled the variation between the mean posterior densities of the food sources and their standard deviation with the nestling morphometric measurements of different sizes. We found that refuse was gradually delivered to Kelp Gull nestlings during the chick rearing period. Additionally, variation of refuse incorporated into nestling tissues increased with nestlings' size. We propose that parents use more isotopically unique food sources during the nestling growth thereby increasing isotopic diversity. This study highlights the need to improve the current waste management system, which is being reviewed in Uruguay. We believe that decision makers should consider the results of this study, which show that refuse is directly impacting coastal ecosystems through mechanisms poorly explored by the environmental sciences. © 2019 Elsevier B.V.

U2 - 10.1016/j.scitotenv.2019.05.485

DO - 10.1016/j.scitotenv.2019.05.485

M3 - Article

VL - 687

SP - 546

EP - 553

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

ER -