. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 114 CALIFORNIA FISH AND GAME 40 â 030 £20 Q. 10 ^^^3 % freq. occur. 1% [j7o vol. scat -. 40 X d d U5 (/) in (/) â¦- 0) 0 E > < 3 0 0 E 3 0 0 V) U 0 Q. D S 3 liJ 0 to I/) â¦-' o ^ E o 30 -20 E o Eg FIGURE 2. Comparison of four scat analysis techniques applied to selected prey discovered in marten scats deposited from 25 April-2 )uly 1979 and 1980. Food items changed importance rankings when analyzed by different
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 114 CALIFORNIA FISH AND GAME 40 â 030 £20 Q. 10 ^^^3 % freq. occur. 1% [j7o vol. scat -. 40 X d d U5 (/) in (/) â¦- 0) 0 E > < 3 0 0 E 3 0 0 V) U 0 Q. D S 3 liJ 0 to I/) â¦-' o ^ E o 30 -20 E o Eg FIGURE 2. Comparison of four scat analysis techniques applied to selected prey discovered in marten scats deposited from 25 April-2 )uly 1979 and 1980. Food items changed importance rankings when analyzed by different tech- niques (Table 3). Only three items changed ranked position when volume and weight are compared to percent-by-prey-weight. However, when frequency of occurrence is compared to percent-by-prey-weight, five items are ranked differ- ently. TABLE 3. Rank Order of Importance of Marten Prey as Determined by Different Analyses. Prey Prey weight Microlus 1 5. lateralis 2 Eutamias 3 Aves 4 Tamiasciurus 5 Scapanus 6 5orex 7 Thomomys 8 Peromyscus 9 Frequency of occurrence Volume Weight 1 2 3 4 7 6 5 5 6 6 8 8 8 9 9 9 DISCUSSION Traditional scat analysis methods overestimated the importance of small prey and underestimated the importance of large prey. Two factors contributed to this result. The most significant influence was the fact that small prey have a higher ratio of undigestible to digestible matter in theit- bodies. Because the ratio of surface area to volume increases with decreasing body size (Kleiber 1947), the ratio of hair and feathers ingested per unit volume of body increases also. Johnson and Hansen (1979) found that the hair and skeleton of deer mice averaged of dry weight, whereas of the body weight of black- tailed jackrabbits, Lepus californicus, was recovered in scats. Secondly, small prey were entirely consumed whereas some hair, skin and the larger bones of large prey were often uneaten. Because less undigestible matter was consumed,. Pleas
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