قراءة كتاب Natural History of the Salamander, Aneides hardii
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Natural History of the Salamander, Aneides hardii
collected in 1956 and 1957; the items found in them are listed in Table 1. It is not likely that this list is complete for prey species because A. hardii eats a variety of food and probably takes prey almost indiscriminately if it is of appropriate size. The kind of food most frequently eaten was ants; they comprised almost 40 per cent of the total items. Nevertheless, less than half the stomachs contained ants; this may mean that salamanders do not make an effort to take ants over any other prey. Such foraging behavior would result in random capture of ants, and it is noteworthy that the frequency distribution of ants in stomachs suggests a Poisson distribution, a mathematical description of one kind of random distribution.
Table 1.—Numbers of Food Items Found in Stomachs of 16 Specimens of Aneides hardii
Items | Individual animals |
Percentage of total (154) individuals |
Number of stomachs in which found |
|||
Mollusca | ||||||
Pupilla muscorum | } | 3 | 1.9% | } | 4 | |
Gastrocapta sp. | ||||||
Vallonia pulchella? | 4 | 2.5 | ||||
Arthropoda | ||||||
Arachnoida | ||||||
Arachnida | 15 | 9.7 | 9 | |||
Acarina | 13 | 8.4 | 3 | |||
Insecta | ||||||
Orthoptera (Ceuthophilus) | 2 | 1.3 | 2 | |||
Hemiptera | 1 | 0.6 | 1 | |||
Coleoptera | ||||||
adults (carabids and buprestids) |
8 | } | 30.9 | 7 | ||