. Bonner zoologische Beiträge : Herausgeber : Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biologie ; Zoologie. Puffins nichant sur Tenerife 61. Fig. 1 : vue générale de l'aire de reproduction du Puffinus puffinus dans le Barranco de los Chinos Co- (Tenerife). Point "A" indique l'emplacement de la colonie découvert en points "B" et "C" font référence à d'éventuels sites de reproduction. Des sept Burrows, trois ont été trouvés à être abandonnés et partiellement rempli avec de la terre et des feuilles sèches, alors que dans les quatre autres, des excréments et plumes étaient présents,

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. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Manx shearwater nesting on Tenerife 61. Fig. 1: General view of the breeding area of Puffinus puffinus in the Barranco de Los Co- chinos (Tenerife). Point "A" indicates the location of the colony discovered while points "B" and "C" refer to possible breeding sites. Of the seven burrows, three were found to be abandoned and partly filled in with soil and dry leaves, whilst in the remaining four, fresh droppings and feathers were present, together with down in the case of two. In addition, two egg-shells (one with signs of having been bitten by rats) and a keel were found nearby. The minimum distance between two adjacent burrows was 0.6 m while the max- imum was 5 m. The entrance holes in three of the cavities measured were on average 19.6 cm wide and 10.3 cm high. The structure of the burrows hindered an inspection of their interior. A corpse of a rat {Rattus rattus) and various droppings were found in the im- mediate surroundings, the latter presenting the characteristic odour of seabirds. Predation of this murid on various procellariiforms has been reported by several authors (Moors & Atkinson 1984; Atkinson 1985; Cheylan 1985) and possibly represents the cause why three of the burrows were abandoned, a similar phenome- num having been observed by Martin et al. (1989) on the island of La Palma. Owing to the steep orography of the Barranco de Los Cochinos and the peculiar biology of Puffinus puffinus, any estimation of the size of the breeding population is very difficult. However, on the basis of the data available, the number of breeding pairs is around 20. Finally, the results from nocturnal listening stations during the appropriate season in the Barranco de Rodrigo (Guía de Isora), the cliffs above Garachico, Barranco de. Please note that these images are extracted from scanned page images that may

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