Assessing the applicability of stable isotope analysis to determine the contribution of landfills to vultures' diet
Human activities cause changes to occur in the environment that affect resource availability for wildlife. The increase in the human population of cities has led to a rise in the amount of waste deposited in landfills, installations that have become a new food resource for both pest and threatened s...
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| creator | Tauler-Ametller, Helena Hernández-Matías, Antonio Parés, Francesc Pretus, Joan Ll Real, Joan |
| description | Human activities cause changes to occur in the environment that affect resource availability for wildlife. The increase in the human population of cities has led to a rise in the amount of waste deposited in landfills, installations that have become a new food resource for both pest and threatened species such as vultures. In this study we used stable isotope analysis (SIA) and conventional identification of food remains from Egyptian Vultures (Neophron percnopterus) to assess the applicability of SIA as a new tool for determining the composition of the diets of vultures, a group of avian scavengers that is threatened worldwide. We focused on an expanding Egyptian Vulture population in NE Iberian Peninsula to determine the part played by landfills and livestock in the diet of these species, and aimed to reduce the biases associated with conventional ways of identifying food remains. We compared proportions of diet composition obtained with isotope mixing models and conventional analysis for five main prey. The greatest agreement between the two methods was in the categories 'landfills' and 'birds' and the greatest differences between the results from the two methods were in the categories 'livestock', 'carnivores' and 'wild herbivores'. Despite uncertainty associated to SIA, our results showed that stable isotope analysis can help to distinguish between animals that rely on waste and so present enriched levels of δ 13C than those that feed on the countryside. Indeed, a high proportion of food derived from landfills (nearly 50%) was detected in some breeding pairs. Furthermore we performed GLMM analyses that showed that high values of δ 13C in Egyptian Vulture feathers (a proxy of feeding in landfills) are related with high levels of humanization of territories. This method has the potential to be applied to other threatened vulture species for which there is a lack of information regarding resources they are consuming, being especially important as the main causes of vultures decline worldwide are related to the consumption and availability of food resources. |
| doi_str_mv | 10.1371/journal.pone.0196044 |
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The increase in the human population of cities has led to a rise in the amount of waste deposited in landfills, installations that have become a new food resource for both pest and threatened species such as vultures. In this study we used stable isotope analysis (SIA) and conventional identification of food remains from Egyptian Vultures (Neophron percnopterus) to assess the applicability of SIA as a new tool for determining the composition of the diets of vultures, a group of avian scavengers that is threatened worldwide. We focused on an expanding Egyptian Vulture population in NE Iberian Peninsula to determine the part played by landfills and livestock in the diet of these species, and aimed to reduce the biases associated with conventional ways of identifying food remains. We compared proportions of diet composition obtained with isotope mixing models and conventional analysis for five main prey. The greatest agreement between the two methods was in the categories 'landfills' and 'birds' and the greatest differences between the results from the two methods were in the categories 'livestock', 'carnivores' and 'wild herbivores'. Despite uncertainty associated to SIA, our results showed that stable isotope analysis can help to distinguish between animals that rely on waste and so present enriched levels of δ 13C than those that feed on the countryside. Indeed, a high proportion of food derived from landfills (nearly 50%) was detected in some breeding pairs. Furthermore we performed GLMM analyses that showed that high values of δ 13C in Egyptian Vulture feathers (a proxy of feeding in landfills) are related with high levels of humanization of territories. This method has the potential to be applied to other threatened vulture species for which there is a lack of information regarding resources they are consuming, being especially important as the main causes of vultures decline worldwide are related to the consumption and availability of food resources.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0196044</identifier><identifier>PMID: 29718940</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Adaptació animal ; Analytical chemistry ; Animal adaptation ; Animal feeding behavior ; Animals ; Animals and civilization ; Animals i civilització ; Biology and Life Sciences ; Birds ; Breeding ; Carbon 13 ; Carnivores ; Composition ; Diet ; Ecology and Environmental Sciences ; Egyptian vulture ; Environmental aspects ; Feathers ; Feeds ; Food ; Food and nutrition ; Food availability ; Food resources ; Food security ; Gyps ; Gyps fulvus ; Herbivores ; Human populations ; Identification and classification ; Isotopes ; Isòtops ; Landfill ; Landfills ; Livestock ; Medicine and Health Sciences ; Methods ; Neophron percnopterus ; Physical Sciences ; Poisoning ; Poisons ; Population ; Prey ; Química analítica ; Research and Analysis Methods ; Residus ; Resource availability ; Rural areas ; Sanitary landfills ; Scavengers ; Stable isotopes ; Threatened species ; Waste disposal sites ; Waste products ; Wildlife</subject><ispartof>PloS one, 2018-05, Vol.13 (5), p.e0196044-e0196044</ispartof><rights>COPYRIGHT 2018 Public Library of Science</rights><rights>2018 Tauler-Ametller et al. 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Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><rights>cc-by (c) Tauler Ametller, Helena et al., 2018 info:eu-repo/semantics/openAccess <a href="http://creativecommons.org/licenses/by/3.0/es">http://creativecommons.org/licenses/by/3.0/es</a></rights><rights>2018 Tauler-Ametller et al 2018 Tauler-Ametller et al</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c734t-298168ddd8a6b5326753b25ec4a519dce5296030ff09125130a580b2cd7057b3</citedby><cites>FETCH-LOGICAL-c734t-298168ddd8a6b5326753b25ec4a519dce5296030ff09125130a580b2cd7057b3</cites><orcidid>0000-0003-2020-2171</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC5931503/pdf/$$EPDF$$P50$$Gpubmedcentral$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC5931503/$$EHTML$$P50$$Gpubmedcentral$$Hfree_for_read</linktohtml><link.rule.ids>230,314,725,778,782,862,883,2098,2917,23853,26961,27911,27912,53778,53780,79355,79356</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/29718940$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><contributor>Margalida, Antoni</contributor><creatorcontrib>Tauler-Ametller, Helena</creatorcontrib><creatorcontrib>Hernández-Matías, Antonio</creatorcontrib><creatorcontrib>Parés, Francesc</creatorcontrib><creatorcontrib>Pretus, Joan Ll</creatorcontrib><creatorcontrib>Real, Joan</creatorcontrib><title>Assessing the applicability of stable isotope analysis to determine the contribution of landfills to vultures' diet</title><title>PloS one</title><addtitle>PLoS One</addtitle><description>Human activities cause changes to occur in the environment that affect resource availability for wildlife. The increase in the human population of cities has led to a rise in the amount of waste deposited in landfills, installations that have become a new food resource for both pest and threatened species such as vultures. In this study we used stable isotope analysis (SIA) and conventional identification of food remains from Egyptian Vultures (Neophron percnopterus) to assess the applicability of SIA as a new tool for determining the composition of the diets of vultures, a group of avian scavengers that is threatened worldwide. We focused on an expanding Egyptian Vulture population in NE Iberian Peninsula to determine the part played by landfills and livestock in the diet of these species, and aimed to reduce the biases associated with conventional ways of identifying food remains. We compared proportions of diet composition obtained with isotope mixing models and conventional analysis for five main prey. 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This method has the potential to be applied to other threatened vulture species for which there is a lack of information regarding resources they are consuming, being especially important as the main causes of vultures decline worldwide are related to the consumption and availability of food resources.</description><subject>Adaptació animal</subject><subject>Analytical chemistry</subject><subject>Animal adaptation</subject><subject>Animal feeding behavior</subject><subject>Animals</subject><subject>Animals and civilization</subject><subject>Animals i civilització</subject><subject>Biology and Life Sciences</subject><subject>Birds</subject><subject>Breeding</subject><subject>Carbon 13</subject><subject>Carnivores</subject><subject>Composition</subject><subject>Diet</subject><subject>Ecology and Environmental Sciences</subject><subject>Egyptian vulture</subject><subject>Environmental aspects</subject><subject>Feathers</subject><subject>Feeds</subject><subject>Food</subject><subject>Food and nutrition</subject><subject>Food availability</subject><subject>Food resources</subject><subject>Food security</subject><subject>Gyps</subject><subject>Gyps fulvus</subject><subject>Herbivores</subject><subject>Human populations</subject><subject>Identification and classification</subject><subject>Isotopes</subject><subject>Isòtops</subject><subject>Landfill</subject><subject>Landfills</subject><subject>Livestock</subject><subject>Medicine and Health Sciences</subject><subject>Methods</subject><subject>Neophron percnopterus</subject><subject>Physical Sciences</subject><subject>Poisoning</subject><subject>Poisons</subject><subject>Population</subject><subject>Prey</subject><subject>Química analítica</subject><subject>Research and Analysis Methods</subject><subject>Residus</subject><subject>Resource availability</subject><subject>Rural areas</subject><subject>Sanitary landfills</subject><subject>Scavengers</subject><subject>Stable isotopes</subject><subject>Threatened 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one</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Tauler-Ametller, Helena</au><au>Hernández-Matías, Antonio</au><au>Parés, Francesc</au><au>Pretus, Joan Ll</au><au>Real, Joan</au><au>Margalida, Antoni</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Assessing the applicability of stable isotope analysis to determine the contribution of landfills to vultures' diet</atitle><jtitle>PloS one</jtitle><addtitle>PLoS One</addtitle><date>2018-05-02</date><risdate>2018</risdate><volume>13</volume><issue>5</issue><spage>e0196044</spage><epage>e0196044</epage><pages>e0196044-e0196044</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><abstract>Human activities cause changes to occur in the environment that affect resource availability for wildlife. The increase in the human population of cities has led to a rise in the amount of waste deposited in landfills, installations that have become a new food resource for both pest and threatened species such as vultures. In this study we used stable isotope analysis (SIA) and conventional identification of food remains from Egyptian Vultures (Neophron percnopterus) to assess the applicability of SIA as a new tool for determining the composition of the diets of vultures, a group of avian scavengers that is threatened worldwide. We focused on an expanding Egyptian Vulture population in NE Iberian Peninsula to determine the part played by landfills and livestock in the diet of these species, and aimed to reduce the biases associated with conventional ways of identifying food remains. We compared proportions of diet composition obtained with isotope mixing models and conventional analysis for five main prey. The greatest agreement between the two methods was in the categories 'landfills' and 'birds' and the greatest differences between the results from the two methods were in the categories 'livestock', 'carnivores' and 'wild herbivores'. Despite uncertainty associated to SIA, our results showed that stable isotope analysis can help to distinguish between animals that rely on waste and so present enriched levels of δ 13C than those that feed on the countryside. Indeed, a high proportion of food derived from landfills (nearly 50%) was detected in some breeding pairs. Furthermore we performed GLMM analyses that showed that high values of δ 13C in Egyptian Vulture feathers (a proxy of feeding in landfills) are related with high levels of humanization of territories. This method has the potential to be applied to other threatened vulture species for which there is a lack of information regarding resources they are consuming, being especially important as the main causes of vultures decline worldwide are related to the consumption and availability of food resources.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>29718940</pmid><doi>10.1371/journal.pone.0196044</doi><tpages>e0196044</tpages><orcidid>https://orcid.org/0000-0003-2020-2171</orcidid><oa>free_for_read</oa></addata></record> |
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| ispartof | PloS one, 2018-05, Vol.13 (5), p.e0196044-e0196044 |
| issn | 1932-6203 1932-6203 |
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| source | DOAJ Directory of Open Access Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Public Library of Science (PLoS); Recercat; PubMed Central; Free Full-Text Journals in Chemistry |
| subjects | Adaptació animal Analytical chemistry Animal adaptation Animal feeding behavior Animals Animals and civilization Animals i civilització Biology and Life Sciences Birds Breeding Carbon 13 Carnivores Composition Diet Ecology and Environmental Sciences Egyptian vulture Environmental aspects Feathers Feeds Food Food and nutrition Food availability Food resources Food security Gyps Gyps fulvus Herbivores Human populations Identification and classification Isotopes Isòtops Landfill Landfills Livestock Medicine and Health Sciences Methods Neophron percnopterus Physical Sciences Poisoning Poisons Population Prey Química analítica Research and Analysis Methods Residus Resource availability Rural areas Sanitary landfills Scavengers Stable isotopes Threatened species Waste disposal sites Waste products Wildlife |
| title | Assessing the applicability of stable isotope analysis to determine the contribution of landfills to vultures' diet |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-16T01%3A55%3A24IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-gale_plos_&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Assessing%20the%20applicability%20of%20stable%20isotope%20analysis%20to%20determine%20the%20contribution%20of%20landfills%20to%20vultures'%20diet&rft.jtitle=PloS%20one&rft.au=Tauler-Ametller,%20Helena&rft.date=2018-05-02&rft.volume=13&rft.issue=5&rft.spage=e0196044&rft.epage=e0196044&rft.pages=e0196044-e0196044&rft.issn=1932-6203&rft.eissn=1932-6203&rft_id=info:doi/10.1371/journal.pone.0196044&rft_dat=%3Cgale_plos_%3EA537063013%3C/gale_plos_%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=2033865015&rft_id=info:pmid/29718940&rft_galeid=A537063013&rft_doaj_id=oai_doaj_org_article_cf18853c5d5745aca48122a53b2aa7ae&rfr_iscdi=true |