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dc.contributor.authorZabala Albizua, Francisco Javier
dc.contributor.authorTrexler, Joel C.
dc.contributor.authorJayasena, Nilmini
dc.contributor.authorFrederick, Peter
dc.date.accessioned2022-11-29T18:15:19Z
dc.date.available2022-11-29T18:15:19Z
dc.date.issued2023-02
dc.identifier.citationScience of The Total Environment 858(Part 1) : (2023) // Article ID 159706es_ES
dc.identifier.issn1879-1026
dc.identifier.urihttp://hdl.handle.net/10810/58607
dc.description.abstractMercury (Hg) is a globally distributed pollutant. Its sub-lethal effects on reproduction of birds have been used as indicators of contamination and of potential demographic effects. However, studies typically used single endpoints that might not be representative of entire reproductive cycle. To estimate timing and net cumulative effects of Hg exposure under field conditions, we used observational data over 11 years from >1200 nests of great egrets breeding under temporally and spatially varying food availability and Hg exposures in the Florida Everglades. We collected measures of fish biomass and availability (>100 locations annually) and used four avian reproductive endpoints that represented the entire breeding cycle. We calculated net reproductive loss by adding estimated Hg effects on failures prior to egg laying, clutch size, hatching success and nestling survival in response to food availability and Hg exposure. To validate and assess results of the observational egret study, we ran the same analyses with data of captive breeding white ibises experimentally exposed to Hg with ad libitum food over 3 years. We found large (>50 %) reductions in great egret offspring with high Hg exposure (18 mug/g dw THg nestling feather, ~0.7 mug/g ww whole egg THg) and high food availability, and even larger reductions (up to 100 %) with high Hg exposure and low food. Timing and the relative contribution of different endpoints to overall reproductive failure varied with food availability. Failures prior to egg laying were relevant at all food availabilities and proportionally most important during high food availability (~70 % of total losses). Under high food, post-hatching failures increased moderately with increasing exposure (~10 % of total losses), and under low food, hatching failures became dominant (~50 % of total losses). Patterns of failure of captive white ibis fed ad libitum resembled those of great egrets under high food availability but differed in total magnitude. We suggest that, a) net reproductive effects of Hg in free-ranging animals are probably much higher than generally reported in studies using single endpoints, b) Hg effect sizes vary considerably among different endpoints and c) food availability is a strong driver of timing and net effects of Hg exposure.es_ES
dc.description.sponsorshipThis work was supported by the U.S. Army Corps of Engineers (W912HZ-12-02-0007) and by grants of equipment from the University of Florida Institute of Food and Agricultural Sciences. Egret monitoring was performed under University of Florida IACUC permit 201708650. Fish sampling was supported by Cooperative Agreements W912HZ-11-2-0048 and W912HZ-16-2-0008 between Florida International University (FIU) and the U. S. Army Corps of Engineers and Contract 4600001083 between FIU and the South Florida Water Management District. Fish monitoring was performed under FIU IACUC permits including IACUC-08-004, -09-029, -10-026, 12-020, -13-060, and -16-033. Nestling ibises were collected from the field under Florida Fish and Wildlife Conservation Commission permit WX03527, which also allowed for their maintenance in captivity, and with a modification, re-release into the wild. Ibises were held in captivity under Institutional Animal Care and Use Committee permit D424-2006. Great egret picture in Fig. 1 was taken by J. A. Gonzalez-Oreja and used with his permission while the White Ibis image in the same figure was extracted from a picture downloaded from www.all-free-photos.com licensed under CC BY-SA 2.5. We are grateful to two anonymous reviewers whose comments greatly improved the ms.es_ES
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/*
dc.subjectevergladeses_ES
dc.subjectgreat egretes_ES
dc.subjectreproductive impairmentes_ES
dc.subjectsubletal endpointses_ES
dc.subjecttiminges_ES
dc.subjectwhite ibises_ES
dc.titleTiming and magnitude of net methylmercury effects on waterbird reproductive output are dependent on food availability.es_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.rights.holder© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).es_ES
dc.rights.holderAtribución-NoComercial-SinDerivadas 3.0 España*
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0048969722068061?via%3Dihubes_ES
dc.identifier.doi10.1016/j.scitotenv.2022.159706
dc.departamentoesZoología y biología celular animales_ES
dc.departamentoeuZoologia eta animalia zelulen biologiaes_ES


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© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Except where otherwise noted, this item's license is described as © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).