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Effects of birch phenolics on a grazing and a browsing mammal: A comparison of hares (1991)

Iason, G. R. ; Palo, R. T.

Springer

Journal of chemical ecology 17 (1991), S. 1733-1743

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ISSN: 1573-1561

Keywords: Lepus timidus ; Lepus europaeus ; Betula pendula ; hares ; birch ; phenolic ; digestion ; chemical defense ; sodium balance

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Chemistry and Pharmacology

Notes: Abstract Mountain hares (Lepus timidus L.) commonly have high proportions of birch (Betula spp.) in their winter diets, whereas European hares (Lepus europaeus) do not. The effects of a birch extract added to laboratory diets offered to mountain hares and European hares on the digestibility and sodium balance were measured. The extract added contained total phenolics equivalent in amount to that occurring in diets containing 0, 40, 60 and 80% dry matter of birch twigs. Increasing dietary phenolic concentration led to reduced voluntary food intake and apparent protein digestibility in both hare species. No effects on apparent dry matter digestibility were observed. The highest concentration of birch extract caused severe sodium losses via the urine by European hares but not by mountain hares. The effects of the birch extract within the digestive system appear to be similar in the two hare species, whereas the mountain hare appears to be better adapted to the toxic effects that disrupted sodium balance in the European hare. These preliminary results suggest that detoxification rather than digestive abilityper se may contribute to different mammalian herbivores' feeding strategies.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00993725

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Analysis of gases containing inorganic compounds and light hydrocarbons on fused-silica open-tubular columns prepared with a thick liquid phase filmEnlarged text of a paper presented at the 35th Pittsburgh Conference on Analytical Chemistry and Applied Spectroscopy, Atlantic City, NJ, USA, March 5-9, 1984. (1984)

Palo, R. T. ; Walters, J. D. ; March, E. W. ; [et al.]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 358-369

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ISSN: 0935-6304

Keywords: Gas chromatography ; Capillary columns ; Thick liquid phase films ; Natural and refinery gases ; Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Capillary columns having a thick liquid phase film and a low phase ratio permit the separation of low molecular mass compounds which would have a very small capacity factor on columns with a classical thin film. At the same time, the increased sample capacity allows conventional hot-wire thermal conductivity detectors to be used with such columns. The analysis of natural and refinery gases, containing both inorganic compounds and light (C1—C7) hydrocarbons, utilizing a combination of hot-wire and flame ionization detectors, is demonstrated.

Additional Material: 10 Ill.