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首页> 外文期刊>Journal of arid environments >Dietary modifications of packrats in response to changing plant communities: Evidence from fossil plant cuticles spanning > 55,000 years in Sonoran Desert packrat middens
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Dietary modifications of packrats in response to changing plant communities: Evidence from fossil plant cuticles spanning > 55,000 years in Sonoran Desert packrat middens

机译：rat鼠对植物群落变化的饮食变化：来自索诺兰沙漠pack鼠中部超过55,000年的化石植物表皮的证据

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摘要

Plant cuticles in fecal pellets from 45 Neotoma middens from northeastern Baja California, Mexico were analyzed to explore woodrat dietary composition spanning >55,000 years. Pleistocene cuticles were dominated by the more mesic and/or chaparral-type extralocals Juniperus californica, Nolina, Agave cf. deserti, Salvia, and Simmondsia chinensis. Cylindoputia/Opuntia cuticles were abundant throughout both the Pleistocene and Holocene. Together, these species comprised the bulk of the woodrats' diet during the last ice age. The glacial-interglacial transition showed the replacement of extralocals in the diet by more xeric desert scrub species, especially Acacia greggii, Larrea tridentata, Olneya tesota, and Prosopis glandulosa var. torreyana. The main dietary species were all also highly abundant as macrofossils, suggesting preferential collection of favored foods. Interestingly, J. californica and Nolina cuticles persisted >1500 years after disappearing from macrofossils, while 0. tesota cuticles appeared 4160 years earlier. It is possible that consumption of particularly prized foods at times they were less abundant left little material for incorporation into middens. Analyzing cuticles along with macrofossils from middens provides complimentary information about woodrat dietary preferences, helps refine the timing of species arrivals/disappearances, and shows how diets shifted with changing climatic conditions. (C) 2016 Elsevier Ltd. All rights reserved.
机译：分析了墨西哥下加利福尼亚州东北部45个Neotoma中部的粪便颗粒中的植物表皮，以探索超过55,000年的伍德拉特饮食组成。更新世角质层由更多的斜生和/或丛林型的外来人占主导，Juniperus californica，Nolina，Agave参见。 deserti，丹参和Simmondsia chinensis。整个更新世和全新世的Cylindoputia / Opuntia表皮都很丰富。这些物种在一起构成了最后一个冰河时代during鼠大部分的食物。冰川-冰川间过渡表明，饮食中的外来生物被更多的干旱沙漠灌丛物种所取代，尤其是阿拉伯金合欢（Gca greggii），拉雷亚（Larrea tridentata），奥尼娅·特斯塔（Olneya tesota）和绿头象（Prosopis glandulosa var）。托里亚纳。主要的饮食种类也都作为大型化石而高度丰富，表明优先收集了偏爱的食物。有趣的是，J。californica和Nolina角质层在从大型化石中消失后持续了1500年以上，而tesota角质层早在4160年出现了。食用特别珍贵的食物时，可能会减少它们的摄入量，而留下的物质很少。分析表皮以及来自中部的大型化石，可提供有关伍德拉特饮食偏好的免费信息，有助于确定物种到达/消失的时间，并显示饮食如何随着气候条件的变化而变化。 （C）2016 Elsevier Ltd.保留所有权利。

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