{"title":"非洲波状衣原体的兰萨罗特岛种群:人口普查、性别比例、生产力和一种新的调查方法","authors":"J. Alonso, C. Palacín, I. Abril‐Colón","doi":"10.13157/arla.67.1.2020.sc2","DOIUrl":null,"url":null,"abstract":"Lanzarote island, in the Canary archipelago, is the main stronghold of the Canarian subspecies of the African Houbara Bustard Chlamydotis undulata fuertaventurae. The size of this population has been estimated several times in recent decades, based on extrapolations of bird densities obtained in small sampling areas. Here we present the results of the first complete census of the Houbara population of this island, based on car transects combined with frequent and prolonged scanning stops, and carried out during the mating season, in January-February 2018. Based on a count of 370 birds (161 males, 209 females) we estimate a total population of 440-452 Houbara Bustards on the island. For the first time, a sex-ratio figure was obtained for this species: 1.41 females per male. The annual production of juveniles was recorded for three years and varied between 5.83 and 19.57 juveniles per hundred females. The census method used in this study is proposed as an alternative to the line transects used previously, since it avoids possible methodological flaws that probably overestimate the population. The present method also enables sex ratio and productivity to be determined, and it established the locations of most displaying males. These are important parameters for evaluating the conservation status and reproductive performance of this endangered subspecies of the African Houbara.—Alonso, J.C., Palacin, C. and Abril-Colon, I. (2020). The Lanzarote population of the African Houbara Chlamydotis undulata fuertaventurae: census, sex ratio, productivity, and a proposed new survey method. Ardeola, 67: XX-XX.","PeriodicalId":55571,"journal":{"name":"Ardeola-International Journal of Ornithology","volume":"5 1","pages":""},"PeriodicalIF":1.4000,"publicationDate":"2019-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"11","resultStr":"{\"title\":\"The Lanzarote Population of the African Houbara Chlamydotis undulata fuertaventurae: Census, Sex Ratio, Productivity, and a Proposed New Survey Method\",\"authors\":\"J. Alonso, C. Palacín, I. Abril‐Colón\",\"doi\":\"10.13157/arla.67.1.2020.sc2\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Lanzarote island, in the Canary archipelago, is the main stronghold of the Canarian subspecies of the African Houbara Bustard Chlamydotis undulata fuertaventurae. The size of this population has been estimated several times in recent decades, based on extrapolations of bird densities obtained in small sampling areas. Here we present the results of the first complete census of the Houbara population of this island, based on car transects combined with frequent and prolonged scanning stops, and carried out during the mating season, in January-February 2018. Based on a count of 370 birds (161 males, 209 females) we estimate a total population of 440-452 Houbara Bustards on the island. For the first time, a sex-ratio figure was obtained for this species: 1.41 females per male. The annual production of juveniles was recorded for three years and varied between 5.83 and 19.57 juveniles per hundred females. The census method used in this study is proposed as an alternative to the line transects used previously, since it avoids possible methodological flaws that probably overestimate the population. The present method also enables sex ratio and productivity to be determined, and it established the locations of most displaying males. These are important parameters for evaluating the conservation status and reproductive performance of this endangered subspecies of the African Houbara.—Alonso, J.C., Palacin, C. and Abril-Colon, I. (2020). The Lanzarote population of the African Houbara Chlamydotis undulata fuertaventurae: census, sex ratio, productivity, and a proposed new survey method. 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The Lanzarote Population of the African Houbara Chlamydotis undulata fuertaventurae: Census, Sex Ratio, Productivity, and a Proposed New Survey Method
Lanzarote island, in the Canary archipelago, is the main stronghold of the Canarian subspecies of the African Houbara Bustard Chlamydotis undulata fuertaventurae. The size of this population has been estimated several times in recent decades, based on extrapolations of bird densities obtained in small sampling areas. Here we present the results of the first complete census of the Houbara population of this island, based on car transects combined with frequent and prolonged scanning stops, and carried out during the mating season, in January-February 2018. Based on a count of 370 birds (161 males, 209 females) we estimate a total population of 440-452 Houbara Bustards on the island. For the first time, a sex-ratio figure was obtained for this species: 1.41 females per male. The annual production of juveniles was recorded for three years and varied between 5.83 and 19.57 juveniles per hundred females. The census method used in this study is proposed as an alternative to the line transects used previously, since it avoids possible methodological flaws that probably overestimate the population. The present method also enables sex ratio and productivity to be determined, and it established the locations of most displaying males. These are important parameters for evaluating the conservation status and reproductive performance of this endangered subspecies of the African Houbara.—Alonso, J.C., Palacin, C. and Abril-Colon, I. (2020). The Lanzarote population of the African Houbara Chlamydotis undulata fuertaventurae: census, sex ratio, productivity, and a proposed new survey method. Ardeola, 67: XX-XX.
期刊介绍:
Ardeola: International Journal of Ornithology is the scientific journal of SEO/BirdLife, the Spanish Ornithological Society. The journal had a regional focus when it was first published, in 1954. Since then, and particular during the past two decades, the journal has expanded its thematic and geographical scope. It is now a fully international forum for research on all aspects of ornithology. We thus welcome studies within the fields of basic biology, ecology, behaviour, conservation and biogeography, especially those arising from hypothesis-based research. Although we have a long publication history of Mediterranean and Neotropical studies, we accept papers on investigations worldwide.
Each volume of Ardeola has two parts, published annually in January and July. The main body of each issue comprises full-length original articles (Papersand Review articles) and shorter notes on methodology or stimulating findings (Short Communications). The publication language is English, with summaries, figure legends and table captions also in Spanish. Ardeolaalso publishes critical Book Reviewsand PhD-Dissertation Summaries; summarising ornithological theses defended in Spain. Finally there are two Spanish-language sections, Ornithological News; summarising significant recent observations of birds in Spain, and Observations of Rare Birds in Spain, the annual reports of the Spanish Rarities Committee.