Long-Term Griffon Vulture Population Dynamics at Gamla Nature Reserve
Gamla Nature Reserve (GNR) used to host the largest colony of Eurasian griffon vultures (Gyps fulvus) in northern Israel. Since the early 2000s, the colony has suffered a drastic decline, which could lead to its extinction. In this descriptive study we present the population dynamics at GNR based on...
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| Veröffentlicht in: | The Journal of wildlife management 2019-01, Vol.83 (1), p.135-144 |
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| creator | CHORESH, YAEL BURG, DAVID TROP, TAMAR IZHAKI, IDO MALKINSON, DAN |
| description | Gamla Nature Reserve (GNR) used to host the largest colony of Eurasian griffon vultures (Gyps fulvus) in northern Israel. Since the early 2000s, the colony has suffered a drastic decline, which could lead to its extinction. In this descriptive study we present the population dynamics at GNR based on an analysis of data collected over 15 years (1999–2013). A monitoring scheme of monthly counts, developed at GNR, provided a database, facilitating a mathematical analysis of the population decline trends and their seasonal fluctuations. The analysis revealed a decline in the population size, which appears similar to an inverse-sigmoid and indicates a potential extinction of the colony by 2020. The analysis also indicates that, in addition to the overall pattern, the number of vultures fluctuates seasonally, with smaller numbers in spring and greater numbers in autumn and winter. Furthermore, this model suggests that latent factors might have influenced the decline; poisoning, thought to be a root cause, might not be the only factor influencing extinction. We demonstrate the importance of combining frequent data collection with modeling techniques for the analysis of raptor population trends. |
| doi_str_mv | 10.1002/jwmg.21566 |
| format | Article |
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Since the early 2000s, the colony has suffered a drastic decline, which could lead to its extinction. In this descriptive study we present the population dynamics at GNR based on an analysis of data collected over 15 years (1999–2013). A monitoring scheme of monthly counts, developed at GNR, provided a database, facilitating a mathematical analysis of the population decline trends and their seasonal fluctuations. The analysis revealed a decline in the population size, which appears similar to an inverse-sigmoid and indicates a potential extinction of the colony by 2020. The analysis also indicates that, in addition to the overall pattern, the number of vultures fluctuates seasonally, with smaller numbers in spring and greater numbers in autumn and winter. Furthermore, this model suggests that latent factors might have influenced the decline; poisoning, thought to be a root cause, might not be the only factor influencing extinction. 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We demonstrate the importance of combining frequent data collection with modeling techniques for the analysis of raptor population trends.</description><subject>Colonies</subject><subject>Data collection</subject><subject>Data processing</subject><subject>Eurasian griffon vulture</subject><subject>Extinction</subject><subject>Gamla Nature Reserve</subject><subject>Israel</subject><subject>logistic model</subject><subject>Mathematical analysis</subject><subject>monthly counts</subject><subject>Nature reserves</subject><subject>Population</subject><subject>Population decline</subject><subject>Population dynamics</subject><subject>Population Ecology</subject><subject>Population number</subject><subject>Population studies</subject><subject>Seasonal variations</subject><subject>Species extinction</subject><subject>time series analysis</subject><subject>Trends</subject><subject>Wildlife</subject><issn>0022-541X</issn><issn>1937-2817</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNp9kEtLw0AUhQdRsFY37oWAOyF1HslMspRao1IfSH3shuk8SkIedSax5N87bdSlqwvnfudezgHgFMEJghBfFptqNcEopnQPjFBKWIgTxPbByC9xGEfo4xAcOVdASBBK6AjM5k29ChfaVkFmc2OaOnjryrazOnhu1l0p2txL130tqly6QLRBJqpSBI9ix7xop-2XPgYHRpROn_zMMXi9mS2mt-H8KbubXs1DSeKUhgpBpoyOyBJqohRUBDOMjIypRgQrmUAkmaaJiuhSRVBiuRSJoYSaiCmsFBmD8-Hu2jafnXYtL5rO1v4l96FZin3C1FMXAyVt45zVhq9tXgnbcwT5tia-rYnvavIwGuBNXur-H5Lfvz9kv56zwVO4trF_HkwpTBmm5BvDenPi</recordid><startdate>20190101</startdate><enddate>20190101</enddate><creator>CHORESH, YAEL</creator><creator>BURG, DAVID</creator><creator>TROP, TAMAR</creator><creator>IZHAKI, IDO</creator><creator>MALKINSON, DAN</creator><general>Wiley</general><general>Blackwell Publishing Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QG</scope><scope>7QL</scope><scope>7SN</scope><scope>7ST</scope><scope>7T7</scope><scope>7U6</scope><scope>7U9</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>H94</scope><scope>M7N</scope><scope>P64</scope><orcidid>https://orcid.org/0000-0002-4718-2644</orcidid></search><sort><creationdate>20190101</creationdate><title>Long-Term Griffon Vulture Population Dynamics at Gamla Nature Reserve</title><author>CHORESH, YAEL ; 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Since the early 2000s, the colony has suffered a drastic decline, which could lead to its extinction. In this descriptive study we present the population dynamics at GNR based on an analysis of data collected over 15 years (1999–2013). A monitoring scheme of monthly counts, developed at GNR, provided a database, facilitating a mathematical analysis of the population decline trends and their seasonal fluctuations. The analysis revealed a decline in the population size, which appears similar to an inverse-sigmoid and indicates a potential extinction of the colony by 2020. The analysis also indicates that, in addition to the overall pattern, the number of vultures fluctuates seasonally, with smaller numbers in spring and greater numbers in autumn and winter. Furthermore, this model suggests that latent factors might have influenced the decline; poisoning, thought to be a root cause, might not be the only factor influencing extinction. 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| source | JSTOR Archive Collection A-Z Listing; Wiley Online Library All Journals |
| subjects | Colonies Data collection Data processing Eurasian griffon vulture Extinction Gamla Nature Reserve Israel logistic model Mathematical analysis monthly counts Nature reserves Population Population decline Population dynamics Population Ecology Population number Population studies Seasonal variations Species extinction time series analysis Trends Wildlife |
| title | Long-Term Griffon Vulture Population Dynamics at Gamla Nature Reserve |
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