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Journal of African Ornithology
Volume 91, 2020 - Issue 4
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Research Articles

Large Pleistocene avian tracks on the Cape south coast of South Africa

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Pages 275-291 | Received 20 Apr 2020, Accepted 16 Jun 2020, Published online: 01 Sep 2020
 

Abstract

Prior to the inception of the Cape south-coast ichnology project, only one avian tracksite had been reported from South Africa. An additonal twenty-nine sites have now been identified. Although there are limitations and challenges inherent in the study of fossil avian tracks, these tracks have the capacity to complement the traditional skeletal fossil record. Six of these tracksites exhibit the tracks of large avian trackmakers. In some of these cases, the tracks are larger than would be anticipated from an understanding of extant birds in the region and from the skeletal fossil record. This raises the possibility of large Pleistocene forms of extant taxa, and of Late Pleistocene avian extinctions. In one case, track preservation was of exceptional quality, and allowed the identification of previously unreported flamingo feeding traces.

Grandes traces aviaires du Pléistocène sur la côte sud du Cap en Afrique du Sud

Avant le lancement du projet d’ichnologie de la côte sud du Cap, un seul site de traces fossiles d’oiseaux avait été signalée en Afrique du Sud. Vingt-neuf autres sites ont maintenant été identifiés. Bien qu’il y ait des limites et des défis inhérents à l’étude des traces fossiles aviaires, ces traces ont la capacité de compléter les fossiles squelettiques traditionnels. Six de ces sites de traces fossiles aviaires présentent les traces de grands oiseaux. Dans certains cas, les traces sont plus grandes que ce que l’on pourrait prévoir à partir des connaissances des oiseaux existants dans la région et des fossiles squelettiques collectés. Cela soulève la possibilité de présence de taxons existants de grande forme au Pléistocène, et donc d’extinctions aviaires du Pléistocène tardif. Dans un cas, la conservation des traces était d’une qualité exceptionnelle et a permis d’identifier des traces d’alimentation de flamants roses non enregistrées auparavant.

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