. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. I. Elvlssa Island Formentera Islets Fig. 4: Proportion in which different plant parts (see text) were found in stomach contents of Podareis pityusensis. A significant correlation between average prey size and trophic diversity was found (with B index, Rs = , p<, and with Bs index, Rs = , p<). Hence, a less diverse diet, obviously based on clumped prey (see also below), implies a lower average prey size. This appears to be one of the reasons f
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. I. Elvlssa Island Formentera Islets Fig. 4: Proportion in which different plant parts (see text) were found in stomach contents of Podareis pityusensis. A significant correlation between average prey size and trophic diversity was found (with B index, Rs = , p<, and with Bs index, Rs = , p<). Hence, a less diverse diet, obviously based on clumped prey (see also below), implies a lower average prey size. This appears to be one of the reasons for the lack of a correlation between prey size and body size of the lizards. Also, the high variability in prey size taken will mask any existing smaller difference. Plant consumption seems to be very variable in the Tuscan Archipelago (table 3 and 4) and not widespread among individuals of the populations, judging from the relati- vely low proportion of stomachs with plant matter. The importance of plants in the diet seems to be less pronounced in P. muralis than in P sicula. Plant matter was found only in a minor proportion of the stomachs of P hispánica from Benidorm Island (table 8). This kind of food type is even less important in P sicula from Menorca and completely absent from the sample of P tiliguerta (table 8). Finally, plant matter was frequently found in the diet of P pityusensis and P lil- fordi (tables 5, 6, and 7). The Balearic species (pooled data) showed a significantly higher percentage of individuals consuming plant matter than both Podareis species (pooled) from the Tuscan Archipelago (Mann-Withney U test, Z = , p=^), but we did not find a significant difference between both archipelagos concerning the average volume of plant matter (Z = , P = ). Spearman rank correlation analyses were computed between principal dietary factors and other characteristics of the populations under study supposedly related with plant consumption (table 9). We
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