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首页> 外文OA文献 >Energy and water use by invasive goats (Capra hircus) in an Australian rangeland, and a caution against using broad-scale allometry to predict species-specific requirements
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Energy and water use by invasive goats (Capra hircus) in an Australian rangeland, and a caution against using broad-scale allometry to predict species-specific requirements

机译：通过澳大利亚牧场的侵入性山羊（Capra Hircus）的能源和用水，并谨慎地使用广泛的分象来预测物种特定要求

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Feral goats (Capra hircus) are ubiquitous across much of Australiau27s arid and semi-arid rangelands, where they compete with domestic stock, contribute to grazing pressure on fragile ecosystems, and have been implicated in the decline of several native marsupial herbivores. Understanding the success of feral goats in Australia may provide insights into management strategies for this and other invasive herbivores. It has been suggested that frugal use of energy and water contributes to the success of feral goats in Australia, but data on the energy and water use of free-ranging animals are lacking. We measured the field metabolic rate and water turnover rate of pregnant and non-pregnant feral goats in an Australian rangeland during late summer (dry season). Field metabolic rate of pregnant goats (601±37 kJ kg−0.73 d−1) was 1.3 times that of non-pregnant goats (456±24 kJ kg−0.73 d−1). The water turnover rate of pregnant goats (228± 18 mL kg−0.79 d−1) was also 1.3 times that of non-pregnant goats (173±18 kg−0.79 d−1), but the difference was not significant (P=0.07). There was no significant difference in estimated dry matter digestibility between pregnant and non-pregnant goats (mean ca. 58%), blood or urine osmolality, or urine electrolyte concentrations, indicating they were probably eating similar diets and were able to maintain osmohomeostasis. Overall, the metabolic and hygric physiology of non-pregnant goats conformed statistically to the predictions for non-marine, non-reproductive placental mammals according to both conventional and phylogenetically independent analyses. That was despite the field metabolic rate and estimated dry matter intake of nonpregnant goats being only 60% of the predicted level. We suggest that general allometric analyses predict the range of adaptive possibilities for mammals, but that specific adaptations, as present in goats, result in ecologically significant departures from the average allometric curve. In the case of goats in the arid Australian rangelands, predictions from the allometric regression would overestimate their grazing pressure by about 40% with implications for the predicted impact on their local ecology.
机译：野生山羊（山羊属）是横跨许多澳大利亚 u27s干旱和半干旱草原，在那里他们与国内股市的竞争，有助于放牧对脆弱的生态系统的压力，并在几个本地有袋动物食草动物的下降有牵连无处不在。了解澳大利亚的野生山羊的成功可以提供深入了解这种管理策略和其他侵入性食草动物。有人建议，节约使用能源和水有助于对澳大利亚野生山羊的成功，但对能源和水的使用自由放养的动物的数据缺乏。我们夏末（旱季）期间测量在澳大利亚牧场孕妇和非孕妇野生山羊的领域代谢率和水的周转率。怀孕的山羊字段代谢率（601±37千焦耳公斤 - 0.73 d-1）为1.3倍，非妊娠山羊（456±24千焦耳公斤 - 0.73 d-1）。怀孕山羊的水失误率（228±18毫升公斤 - 0.79 d-1）也非怀孕山羊（173±18公斤 - 0.79 d-1）的1.3倍，但差异并不显著（P = 0.07）。有在怀孕和非怀孕山羊之间，血或尿渗透压，或尿中的电解质浓度估计干物质消化率（平均约58％）无显著差异，表明它们可能是吃同类的饮食，并能保持osmohomeostasis。总体而言，非妊娠山羊的代谢和生理学hygric根据常规和系统发生学上独立分析统计学符合预测非海洋，非生殖胎盘哺乳动物。那是，尽管该领域的代谢率和非妊娠山羊作为预测水平的只有60％，估计干物质采食量。我们建议一般异速生长分析预测对哺乳动物适应的各种可能性，但具体的调整，如存在于山羊，导致从平均异速生长曲线生态显著偏离。在干旱的澳大利亚牧场山羊的情况下，从异速生长回归预测将与他们当地的生态环境带来的预期影响影响会高估自己的放牧压力约40％。

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