. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Kestrel diet in the Canary Islands 45 Percentage of prey items 50% 40% 30% 20% 10% 0%. Interval weight range (g) Fig. 3: Variability of size of prey items consumed on El Hierro (grey columns) and Fuerteven- tura (black columns) according to the frequency of prey caught, related to category of weight assigned. The most important taxa for the different weight range are: — (H: Hymenoptera
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Kestrel diet in the Canary Islands 45 Percentage of prey items 50% 40% 30% 20% 10% 0%. Interval weight range (g) Fig. 3: Variability of size of prey items consumed on El Hierro (grey columns) and Fuerteven- tura (black columns) according to the frequency of prey caught, related to category of weight assigned. The most important taxa for the different weight range are: — (H: Hymenoptera %, F: Formicidae %); (H: Scarabaeidae F: Scarabaeidae %); (H: Scarabaeidae , F: Curculionidae %, Hymenoptera %, Acrididae %); (H: Acrididae %, Tenebrionidae %, F: Acrididae %, Tettigoniidae %); (H: Tettigoniidae %, F: Lacertidae %); (H: Lacertidae %, F: Gekkonidae %); (H: Muridae %, F: Muridae %) Fuerteventura (Soricidae and Sciuridae are not found on El Hierro), but because the kestrels were at different stages of the reproductive cycle on the two islands. Although Lacertidae, Gallotia galloti in El Hierro and G. atlántica on Fuerteven- tura, are rarely caught, their biomass is substantial for both islands, though not to the extent that it could be considered as a principal food (Koenig 1890, Volsoe 1951 for El Hierro, Bannerman 1963). The proportion of reptiles to the total number of prey was low, as was the case in almost all areas of the Palaearctic Region, with only small differences occurring between the southern and northern parts of the region (Aparicio 1990). Nevertheless, within the vertebrates, the percentages of lizards ( on Fuerteventura, on El Hierro) are high, confirming Village's (1990) thesis that an increase occurs at southern latitudes in the Palaearctic. The frequency of invert
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