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Body size of Chilean foxes: a new pattern in light of new data

100%

Jimenez J. E., Yanez J. L., Tabilo E. L., Jaksic F. M.

Acta Theriologica

1995

tom 40

nr 3

By using body measurements and weight data of culpeo fox Dusicyon culpaeus Molina, 1782 and chilla fox D. griseus Gray, 1837 from the Chinchilla National Reserve (north-central Chile) and Torres del Paine National Park (southern Chile), the body size distribution of Chilean foxes was analyzed and compared to data previously published by Fuentes and Jaksic (1979). Contrary to those authors, our data show that not only the larger but both species increase in size in southern Chile. Thus, latitudinal size distribution of D. culpaeus and D. griseus may not be the result of character displacement through exploitation competition, as previously interpreted, but of bioenergetic adaptations.

Inability of thin-layer chromatography to distinguish feces from congeneric foxes by their bile acid contents

100%

Jimenez J. E., Yanez J. L., Jaksic F. M.

Acta Theriologica

1996

tom 41

nr 2

We used thin-layer chromatography of fecal bile acids in an attempt to separate feces of culpeo fox Pseudalopex culpaeus (Molina, 1782) from those of chilla fox P. griseus (Gray, 1837). We tested the method with pure bile acids and with feces from known fox species on two different plate types. Results differed according to the plate type used. The technique failed to distinguish scats from the two fox species. We found variability in the spot pattern of bile acids within species, and within individuals, likely associated to the diet. The location of the spots {Rf values) also varied with the concentration of the sample, and the color and location changed with different plate types. We warn that the thin-layer chromatography of fecal bile acids is still unreliable for distinguishing feces between sympatric carnivores. Hence, we propose to rely on alternative techniques.

Ograniczanie wyników

2 Acta Theriologica

2 Jaksic F. M.

2 Jimenez J. E.

2 Yanez J. L.

1 Tabilo E. L.

1 1996

1 1995

Wyniki wyszukiwania

Body size of Chilean foxes: a new pattern in light of new data

Inability of thin-layer chromatography to distinguish feces from congeneric foxes by their bile acid contents