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首页> 外文期刊>Anais da Academia Brasileira de Ciencias >Splendid oddness: revisiting the curious trophic relationships of South American Pleistocene mammals and their abundance
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Splendid oddness: revisiting the curious trophic relationships of South American Pleistocene mammals and their abundance

机译：灿烂的怪异：重新审视南美更新世哺乳动物及其丰富的营养关系

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The South American Pleistocene mammal fauna includes great-sized animals that have intrigued scientists for over two centuries. Here we intend to update the knowledge on its palaeoecology and provide new evidence regarding two approaches: energetics and population density and relative abundance of fossils per taxa. To determine whether an imbalance exists, population density models were applied to several South American fossil faunas and the results compared to those that best describe the palaeoecology of African faunas. The results on the abundance study for Uruguay and the province of Buenos Aires during the Lujanian stage/age reveal that bulk-feeding ground sloths (Lestodon and Glossotherium) were more represented in the first territory, while the more selectiveScelidotherium and Megatherium were more abundant in the second. Although the obtained values were corrected to avoid size-related taphonomic biases, linear regressions of abundance vs. body mass plots did not fit the expected either for first or second consumers. South American Pleistocene faunas behave differently from what models suggest they should. Changes in sea level and available area could account for these differences; the possibility of a floodplain in the area then emerged could explain seasonal changes, which would modify the calculations of energetics and abundance.
机译：南美更新世的哺乳动物区系包括大型动物，已经吸引了两个多世纪的科学家。在这里，我们打算更新有关其古生态学的知识，并提供有关两种方法的新证据：能量学和种群密度以及每个分类单元的化石相对丰度。为了确定是否存在失衡，将人口密度模型应用于多个南美化石动物群，并将结果与​​最能描述非洲动物群古生态的模型进行比较。卢加尼时期/年龄对乌拉圭和布宜诺斯艾利斯省进行的丰度研究结果表明，散食的地面树懒（Lestodon和Glossotherium）在第一地区的代表性更高，而在Seleidotherium和Megatherium的选择性更高。第二。尽管对获得的值进行了校正，以避免出现尺寸相关的偏差，但丰度与体重图的线性回归与第一或第二位消费者的预期均不符。南美更新世动物群的行为与模型所建议的不同。海平面和可用面积的变化可以解释这些差异;当时该地区出现洪泛区的可能性可以解释季节性变化，这将改变能量和丰度的计算。

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