کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4465546 1622130 2016 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dietary ecology of Pleistocene camelids: Influences of climate, environment, and sympatric taxa
ترجمه فارسی عنوان
اکولوژی رژیم غذایی camelids پلیستوسن: تاثیر آب و هوا، محیط زیست و گونه sympatric
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


• Stable carbon isotopes characterize the dietary ecology of three camelids.
• Hemiauchenia was a true dietary generalist and Palaeolama was a forest browser.
• Camelops was an opportunistic browser; consuming C3 shrubs, C4 shrubs and/or CAM.
• Glacial McKittrick Brea and interglacial Ingleside had no differences in aridity.
• Generalist diets may allow taxa to adapt to changing environments or immigrate.

Wild members of Camelidae live in some of the most arid environments, including North Africa, Arabia, the Gobi Desert of China and Mongolia and high elevation environments in the Andes Mountains. A better understanding of the paleoecology of the three most abundant Pleistocene camelids (Camelops, Hemiauchenia, and Palaeolama) may clarify modern adaptations to arid environments. Mammalian tooth enamel δ13C values were used to compare diets of co-occurring species in California, Texas, and Florida and δ18O values were used to investigate climate. Carbon isotope analysis suggests Camelops was likely an opportunistic browser that consumed both C3 and C4 browse/CAM plants, potentially consuming C4 browse (e.g., saltbush). Hemiauchenia had an opportunistic and highly generalized diet, while Palaeolama was a specialized forest browser. Stable oxygen isotopes and aridity index values suggest that Ingleside was warmer than McKittrick Brea, but there are no significant differences in aridity between the two sites. Co-occurrence data from the Paleobiology Database suggest that Palaeolama was restricted to forested environments as it occurred with two browsers, Tapirus and Odocoileus, at 90.5% of all sites. Camelops and Hemiauchenia both co-occurred with a broader range of taxa, further suggesting these camelids lived in diverse habitats. The generalized diet of Hemiauchenia, the likely ancestor of modern South American camelids, allowed for the adaptations of extant Lama and Vicugna to survive in the arid environments of the Andes Mountains. Collectively, these data clarify the dietary ecology of extinct camelids and provide insight into the potential importance of generalist diets for increased resilience to changing environments and/or climates.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Palaeogeography, Palaeoclimatology, Palaeoecology - Volume 461, 1 November 2016, Pages 389–400
نویسندگان
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