التفاصيل البيبلوغرافية
| العنوان: |
Diet induced differences in carbon isotope fractionation between sirenians and terrestrial ungulates. |
| المؤلفون: |
Clementz, Mark1 mclemen1@uwyo.edu, Koch, Paul2, Beck, Cathy3 |
| المصدر: |
Marine Biology. Jul2007, Vol. 151 Issue 5, p1773-1784. 12p. 2 Charts, 3 Graphs. |
| مصطلحات موضوعية: |
*DUGONG, *DUGONGIDAE, *FOOD consumption, *AMAZONIAN manatee, *STELLER'S sea cow, *HYDRODAMALIS, *WEST Indian manatee, *MANATEES, *AQUATIC mammals, *AQUATIC animals |
| مستخلص: |
Carbon isotope differences (Δ13C) between bioapatite and diet, collagen and diet, and bioapatite and collagen were calculated for four species of sirenians, Dugong dugon (Müller), Trichechus manatus (Linnaeus), Trichechus inunguis (Natterer), and the extinct Hydrodamalis gigas (Zimmerman). Bone and tooth samples were taken from archived materials collected from populations during the mid eighteenth century ( H. gigas), between 1978 and 1984 ( T. manatus, T. inunguis), and between 1997 and 1999 ( D. dugon). Mean Δ13C values were compared with those for terrestrial ungulates, carnivores, and six species of carnivorous marine mammals (cetaceans = 1; pinnipeds = 4; mustelids = 1). Significant differences in mean δ13C values among species for all tissue types were detected that separated species or populations foraging on freshwater plants or attached marine macroalgae (δ13C values < −6‰; Δ13Cbioapatite–diet ∼14‰) from those feeding on marine seagrasses (δ13C values > −4‰; Δ13Cbioapatite–diet ∼11‰). Likewise, Δ13Cbioapatite–collagen values for freshwater and algal-foraging species (∼7‰) were greater than those for seagrass-foraging species (∼5‰). Variation in Δ13C values calculated between tissues and between tissues and diet among species may relate to the nutritional composition of a species’ diet and the extent and type of microbial fermentation that occurs during digestion of different types of plants. These results highlight the complications that can arise when making dietary interpretations without having first determined species-specific Δ13Ctissue–diet values. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
Academic Search Index |