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n Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie - Dieetsamestelling van voëlsoorte op 'n binnelandse lughawe in Suid-Afrika : research and review article

Volume 21, Issue 1
  • ISSN : 0254-3486
  • E-ISSN: 2222-4173

Abstract

<b>Dietary composition of bird species at an inland airport in South Africa</b> <br>Stomach contents of 51 bird species that posed a potential threat to aviation were collected at the Bloemfontein airport over a period of 11 years (1985-1995). Numerically the crowned plover (<i>Vanellus coronatus</i>), and the lesser kestrel (<i>Falco naumanni</i>), blacksmith plover (<i>V. armatus</i>), whitewinged korhaan (<i>Eupodotis afraoides</i>), doublebanded courser (<i>Smutsornis africanus</i>), spotted dikkop (<i>Burhinus capensis</i>), cattle egret (<i>Bubulcus ibis</i>), Swainson's francolin (<i>Francolinus swainsonii</i>) and Orange River francolin (<i>F. levaillantoides</i>) in sequence of importance, constituted 91, 0% of the total sample (3 544). In general insects can be considered the main food source of the birds concerned. Based on dry mass composition the Isoptera, followed by the Coleoptera and Orthoptera, constituted the most important component in the diet. The Isoptera, more specifically the harvester termite (<i>Hodotermes mossambicus</i>), is, moreover, the only important prey taxon showing a conspicuous utilisation peak during the relative food shortage of the dry season. Evidently, temporary superabundant food sources that periodically come about in grassland habitats are opportunistically utilised by the birds.

Maaginhoude van 51 voëlsoorte wat potensiële gevaar vir lugvaart ingehou het, is oor 'n tydperk van elf jaar (1985-1995) op die Bloemfontein-lughawe versamel. Getalsgewys het die kroonkiewiet (<i>Vanellus coronatus</i>), tesame met die kleinrooivalk (<i>Falco naumanni</i>), bontkiewiet (<i>V.armatus</i>), witvlerkkorhaan (<i>Eupodotis afraoides</i>), dubbelbanddrawwertjie (<i>Smutsornis africanus</i>), dikkop (<i>Burhinus capensis</i>), veereier (<i>Bubulcus ibis</i>), bosveldfisant (<i>Francolinus swainsonii</i>) en Kalaharipatrys (<i>F. levaillantoides</i>) in volgorde van belangrikheid, 91, 0% van die totale monster (3 544) uitgemaak. Oor die algemeen kan insekte as die hoofvoedselbron van die betrokke voëls beskou word. Gebaseer op droëmassa-samestelling vorm die Isoptera, gevolg deur die Coleoptera en Orthoptera, die belangrikste komponente in die dieet. Die Isoptera, meer spesifiek grootgrasdraertermiete (<i>Hodotermes mossambicus</i>), is ook die enigste van die belangrike prooitaksa wat 'n opvallende benuttingspiek gedurende die relatiewe voedselskaarste van die droë seisoen openbaar. Klaarblyklik word tydelik oorvloedige voedselbronne wat periodiek in grasveldhabitats tot stand kom op 'n opportunistiese wyse deur die voëls benut.

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/content/aknat/21/1/EJC20302
2002-03-01
2019-08-25

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