| Abstract: | Tannins are secondary metabolites that may influence feeding by mammals on plants. We analyzed hydrolyzable and condensed tannins in 30 plant species consumed by livestock and deer, as a preliminary attempt to study their possible implications on browsing and grazing in forest ecosystems. Heathers (Ericaceae) and plants of the Rose (Rosaceae) family had tannins, while forbs, grasses and shrubs other than the heathers did not show astringency properties. We found the highest tannin content of all the species in Rubus sp., with the highest value around 180 mg TAE/g dry weight in spring. Potentilla erecta, Alnus glutinosa and Quercus robur were next with 57 to 44 mg TAE/g dw. Total tannins in heathers ranged from 22 to 36 mg TAE/g dw. Levels of condensed tannins were higher than hydrolyzable for most of the species. Only Betula alba, Calluna vulgaris, Pteridium aquilinum and Vaccinium myrtillus had 100% hydrolyzable tannins. Tannin content of the species changed seasonally with highest values during the growing season, corresponding to late winter or early spring, depending on the species. |
| Genre: | Article |
| ProdID: | 70006586 |
| Citation Author: | Gonzalez-Hernandez, M. P.; Karchesy, J.; Starkey, Edward E. |
| Citation Contributing Office: | Forest and Rangeland Ecosystem Science Center |
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| Citation End Page: | 465 |
| Citation Issue: | 5 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Range Management |
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| Citation Number Of Pages: | 5 |
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| Citation Phsyical Description: | 5 p. |
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| Citation Public Comments: | None |
| Citation Publisher: | Allen Press |
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| Citation Search Results Text: | Research observation: Hydrolyzable and condensed tannins in plants of the northwest; 2003; Article; Journal; Journal of Range Management; Gonzalez-Hernandez, M. P.; Karchesy, J.; Starkey, Edward E. |
| Citation Start Page: | 461 |
| Citation Volume: | 56 |
| Citation Year: | 2003 |
| Type: | citation/reference |
| Text: | Research observation: Hydrolyzable and condensed tannins in plants of the northwest; 2003; Article; Journal; Journal of Range Management; Gonzalez-Hernandez, M. P.; Karchesy, J.; Starkey, Edward E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DOCUMENT): | http://dx.doi.org/10.2307/4003837 |
| Date Other: | Wed, 1 Jan 2003 09:18 -0600 |
| Publisher: | Allen Press |
