Dietary studies in birds: testing a non‐invasive method using digital photography in seabirds
Summary Dietary studies give vital insights into foraging behaviour, with implications for understanding changing environmental conditions and the anthropogenic impacts on natural resources. Traditional diet sampling methods may be invasive or subject to biases, so developing non‐invasive and unbias...
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| Veröffentlicht in: | Methods in ecology and evolution 2017-02, Vol.8 (2), p.214-222 |
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| container_title | Methods in ecology and evolution |
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| creator | Gaglio, Davide Cook, Timothée R. Connan, Maëlle Ryan, Peter G. Sherley, Richard B. Kurle, Carolyn |
| description | Summary
Dietary studies give vital insights into foraging behaviour, with implications for understanding changing environmental conditions and the anthropogenic impacts on natural resources. Traditional diet sampling methods may be invasive or subject to biases, so developing non‐invasive and unbiased methods applicable to a diversity of species is essential.
We used digital photography to investigate the diet fed to chicks of a prey‐carrying seabird and compared our approach (photo‐sampling) to a traditional method (regurgitations) for the greater crested tern Thalasseus bergii.
Over three breeding seasons, we identified >24 000 prey items of at least 48 different species, more than doubling the known diversity of prey taken by this population of terns. We present a method to estimate the length of the main prey species (anchovy Engraulis encrasicolus) from photographs, with an accuracy |
| doi_str_mv | 10.1111/2041-210X.12643 |
| format | Article |
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Dietary studies give vital insights into foraging behaviour, with implications for understanding changing environmental conditions and the anthropogenic impacts on natural resources. Traditional diet sampling methods may be invasive or subject to biases, so developing non‐invasive and unbiased methods applicable to a diversity of species is essential.
We used digital photography to investigate the diet fed to chicks of a prey‐carrying seabird and compared our approach (photo‐sampling) to a traditional method (regurgitations) for the greater crested tern Thalasseus bergii.
Over three breeding seasons, we identified >24 000 prey items of at least 48 different species, more than doubling the known diversity of prey taken by this population of terns. We present a method to estimate the length of the main prey species (anchovy Engraulis encrasicolus) from photographs, with an accuracy <1 mm and precision ~ 0·5 mm. Compared to regurgitations at two colonies, photo‐sampling produced similar estimates of prey composition and size, at a faster species accumulation rate. The prey compositions collected by two researchers photo‐sampling concurrently were also similar.
Photo‐sampling offers a non‐invasive tool to accurately and efficiently investigate the diet composition and prey size of prey‐carrying birds. It reduces biases associated with observer‐based studies and is simple to use. This methodology provides a novel tool to aid conservation and management decision‐making in the light of the growing need to assess environmental and anthropogenic change in natural ecosystems.</description><identifier>ISSN: 2041-210X</identifier><identifier>EISSN: 2041-210X</identifier><identifier>DOI: 10.1111/2041-210X.12643</identifier><language>eng</language><publisher>London: John Wiley & Sons, Inc</publisher><subject>Anthropogenic factors ; Aquatic birds ; Breeding seasons ; Chicks ; Composition ; Decision making ; Diet ; Digital photography ; Engraulis encrasicolus ; Environmental changes ; Environmental conditions ; Foraging behavior ; Human influences ; Natural resources ; non‐invasive monitoring ; Photography ; Prey ; prey‐carrying birds ; rarefaction curves ; regurgitation ; Sampling ; Sampling methods ; Species ; Species diversity ; Test procedures ; Thalasseus ; Thalasseus bergii</subject><ispartof>Methods in ecology and evolution, 2017-02, Vol.8 (2), p.214-222</ispartof><rights>2016 The Authors. Methods in Ecology and Evolution © 2016 British Ecological Society</rights><rights>Copyright © 2017 British Ecological Society</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c4843-aa6bd35277e8dea97bb7499b6a29aeb8e84a54ec3c175d687465b212c72bcd7c3</citedby><cites>FETCH-LOGICAL-c4843-aa6bd35277e8dea97bb7499b6a29aeb8e84a54ec3c175d687465b212c72bcd7c3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1111%2F2041-210X.12643$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1111%2F2041-210X.12643$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,27901,27902,45550,45551</link.rule.ids></links><search><creatorcontrib>Gaglio, Davide</creatorcontrib><creatorcontrib>Cook, Timothée R.</creatorcontrib><creatorcontrib>Connan, Maëlle</creatorcontrib><creatorcontrib>Ryan, Peter G.</creatorcontrib><creatorcontrib>Sherley, Richard B.</creatorcontrib><creatorcontrib>Kurle, Carolyn</creatorcontrib><title>Dietary studies in birds: testing a non‐invasive method using digital photography in seabirds</title><title>Methods in ecology and evolution</title><description>Summary
Dietary studies give vital insights into foraging behaviour, with implications for understanding changing environmental conditions and the anthropogenic impacts on natural resources. Traditional diet sampling methods may be invasive or subject to biases, so developing non‐invasive and unbiased methods applicable to a diversity of species is essential.
We used digital photography to investigate the diet fed to chicks of a prey‐carrying seabird and compared our approach (photo‐sampling) to a traditional method (regurgitations) for the greater crested tern Thalasseus bergii.
Over three breeding seasons, we identified >24 000 prey items of at least 48 different species, more than doubling the known diversity of prey taken by this population of terns. We present a method to estimate the length of the main prey species (anchovy Engraulis encrasicolus) from photographs, with an accuracy <1 mm and precision ~ 0·5 mm. Compared to regurgitations at two colonies, photo‐sampling produced similar estimates of prey composition and size, at a faster species accumulation rate. The prey compositions collected by two researchers photo‐sampling concurrently were also similar.
Photo‐sampling offers a non‐invasive tool to accurately and efficiently investigate the diet composition and prey size of prey‐carrying birds. It reduces biases associated with observer‐based studies and is simple to use. This methodology provides a novel tool to aid conservation and management decision‐making in the light of the growing need to assess environmental and anthropogenic change in natural ecosystems.</description><subject>Anthropogenic factors</subject><subject>Aquatic birds</subject><subject>Breeding seasons</subject><subject>Chicks</subject><subject>Composition</subject><subject>Decision making</subject><subject>Diet</subject><subject>Digital photography</subject><subject>Engraulis encrasicolus</subject><subject>Environmental changes</subject><subject>Environmental conditions</subject><subject>Foraging behavior</subject><subject>Human influences</subject><subject>Natural resources</subject><subject>non‐invasive monitoring</subject><subject>Photography</subject><subject>Prey</subject><subject>prey‐carrying birds</subject><subject>rarefaction curves</subject><subject>regurgitation</subject><subject>Sampling</subject><subject>Sampling methods</subject><subject>Species</subject><subject>Species diversity</subject><subject>Test procedures</subject><subject>Thalasseus</subject><subject>Thalasseus bergii</subject><issn>2041-210X</issn><issn>2041-210X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNqFkb1OwzAUhSMEElXpzGqJhSVt_JPYYUOl_EhFLCCxWU5827pK42AnRd14BJ6RJyFpEEIMcJd7ZX_n6OrcIDjF0Ri3NSERwyHB0fMYk4TRg2Dw_XL4Yz4ORt6vo7aoSCPCBoG8MlArt0O-brQBj0yJMuO0v0A1-NqUS6RQacuPt3dTbpU3W0AbqFdWo8Z3v9osTa0KVK1sbZdOVatd5-FB7W1OgqOFKjyMvvoweLqePU5vw_nDzd30ch7mTDAaKpVkmsaEcxAaVMqzjLM0zRJFUgWZAMFUzCCnOeaxTgRnSZwRTHJOslzznA6D8963cvalaTeXG-NzKApVgm28xIITgQUjrEXPfqFr27iy3U4SyhlljFP6F4VFwnFEOI5batJTubPeO1jIyplNm6fEkewuI7vsZZe93F-mVSS94tUUsPsPl_ezGe2Fn7d3kH0</recordid><startdate>201702</startdate><enddate>201702</enddate><creator>Gaglio, Davide</creator><creator>Cook, Timothée R.</creator><creator>Connan, Maëlle</creator><creator>Ryan, Peter G.</creator><creator>Sherley, Richard B.</creator><creator>Kurle, Carolyn</creator><general>John Wiley & Sons, Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QG</scope><scope>7SN</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>P64</scope><scope>RC3</scope></search><sort><creationdate>201702</creationdate><title>Dietary studies in birds: testing a non‐invasive method using digital photography in seabirds</title><author>Gaglio, Davide ; Cook, Timothée R. ; Connan, Maëlle ; Ryan, Peter G. ; Sherley, Richard B. ; Kurle, Carolyn</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4843-aa6bd35277e8dea97bb7499b6a29aeb8e84a54ec3c175d687465b212c72bcd7c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Anthropogenic factors</topic><topic>Aquatic birds</topic><topic>Breeding seasons</topic><topic>Chicks</topic><topic>Composition</topic><topic>Decision making</topic><topic>Diet</topic><topic>Digital photography</topic><topic>Engraulis encrasicolus</topic><topic>Environmental changes</topic><topic>Environmental conditions</topic><topic>Foraging behavior</topic><topic>Human influences</topic><topic>Natural resources</topic><topic>non‐invasive monitoring</topic><topic>Photography</topic><topic>Prey</topic><topic>prey‐carrying birds</topic><topic>rarefaction curves</topic><topic>regurgitation</topic><topic>Sampling</topic><topic>Sampling methods</topic><topic>Species</topic><topic>Species diversity</topic><topic>Test procedures</topic><topic>Thalasseus</topic><topic>Thalasseus bergii</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Gaglio, Davide</creatorcontrib><creatorcontrib>Cook, Timothée R.</creatorcontrib><creatorcontrib>Connan, Maëlle</creatorcontrib><creatorcontrib>Ryan, Peter G.</creatorcontrib><creatorcontrib>Sherley, Richard B.</creatorcontrib><creatorcontrib>Kurle, Carolyn</creatorcontrib><collection>CrossRef</collection><collection>Animal Behavior Abstracts</collection><collection>Ecology Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Genetics Abstracts</collection><jtitle>Methods in ecology and evolution</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Gaglio, Davide</au><au>Cook, Timothée R.</au><au>Connan, Maëlle</au><au>Ryan, Peter G.</au><au>Sherley, Richard B.</au><au>Kurle, Carolyn</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Dietary studies in birds: testing a non‐invasive method using digital photography in seabirds</atitle><jtitle>Methods in ecology and evolution</jtitle><date>2017-02</date><risdate>2017</risdate><volume>8</volume><issue>2</issue><spage>214</spage><epage>222</epage><pages>214-222</pages><issn>2041-210X</issn><eissn>2041-210X</eissn><abstract>Summary
Dietary studies give vital insights into foraging behaviour, with implications for understanding changing environmental conditions and the anthropogenic impacts on natural resources. Traditional diet sampling methods may be invasive or subject to biases, so developing non‐invasive and unbiased methods applicable to a diversity of species is essential.
We used digital photography to investigate the diet fed to chicks of a prey‐carrying seabird and compared our approach (photo‐sampling) to a traditional method (regurgitations) for the greater crested tern Thalasseus bergii.
Over three breeding seasons, we identified >24 000 prey items of at least 48 different species, more than doubling the known diversity of prey taken by this population of terns. We present a method to estimate the length of the main prey species (anchovy Engraulis encrasicolus) from photographs, with an accuracy <1 mm and precision ~ 0·5 mm. Compared to regurgitations at two colonies, photo‐sampling produced similar estimates of prey composition and size, at a faster species accumulation rate. The prey compositions collected by two researchers photo‐sampling concurrently were also similar.
Photo‐sampling offers a non‐invasive tool to accurately and efficiently investigate the diet composition and prey size of prey‐carrying birds. It reduces biases associated with observer‐based studies and is simple to use. This methodology provides a novel tool to aid conservation and management decision‐making in the light of the growing need to assess environmental and anthropogenic change in natural ecosystems.</abstract><cop>London</cop><pub>John Wiley & Sons, Inc</pub><doi>10.1111/2041-210X.12643</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Methods in ecology and evolution, 2017-02, Vol.8 (2), p.214-222 |
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| source | Wiley Online Library Journals Frontfile Complete; Alma/SFX Local Collection |
| subjects | Anthropogenic factors Aquatic birds Breeding seasons Chicks Composition Decision making Diet Digital photography Engraulis encrasicolus Environmental changes Environmental conditions Foraging behavior Human influences Natural resources non‐invasive monitoring Photography Prey prey‐carrying birds rarefaction curves regurgitation Sampling Sampling methods Species Species diversity Test procedures Thalasseus Thalasseus bergii |
| title | Dietary studies in birds: testing a non‐invasive method using digital photography in seabirds |
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