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Seasonal diet preferences of chital deer in the northern Queensland dry tropics, Australia
Rangeland Journal ( IF 1.2 ) Pub Date : 2020-07-31 , DOI: 10.1071/rj20015
Kurt Watter , Greg Baxter , Michael Brennan , Tony Pople , Peter Murray

Chital deer (Axis axis) were introduced to the Burdekin dry tropics of north Queensland, Australia, in the late 1800s. Here rainfall and plant growth are highly seasonal and a nutritional bottleneck for grazing animals occurs annually before the wet season. This study describes the seasonal changes in diet and diet preference of chital in this seasonally-variable environment. Rumen samples were taken from 162 deer from two sites over the wet and dry seasons of two consecutive years and sorted macroscopically for identification. Relative seasonal availability of plant groups was estimated using step point sampling of areas grazed by chital. Chital alter their diet seasonally according to availability and plant phenology. Chital utilised 42 plant genera including grasses, forbs, subshrubs, shrubs, trees and litter. Grass consumption ranged from 53% of biomass intake during the dry season to 95% during the wet season. The predominance of grass in the wet season diet exceeded relative availability, indicating a strong preference. Although grass contributed more than half of the dry season diet it was the least preferred plant group, given availability, and the least actively growing. Shrubs were the preferred plant type in the dry season, and least subject to seasonal senescence. Composition and quantity of seasonal pastures vary markedly in north Queensland, and chital alter their diet by consuming those plants most actively growing. The increased dry season intake of non-grass forage appears to be a strategy to limit the detriment resulting from the progressive deterioration in the quality of grass.



中文翻译:

澳大利亚昆士兰州北部热带热带地区的幼鹿的季节性饮食偏好

鹿(轴轴)是在1800年代后期引入澳大利亚北昆士兰州的Burdekin干旱热带地区的。这里的降雨和植物生长是高度季节性的,每年在雨季之前会出现放牧动物的营养瓶颈。这项研究描述了在这种季节性变化的环境中饮食的季节性变化和手性饮食的饮食偏好。在连续两年的干湿两季中,从两个地点的162头鹿中提取瘤胃样品,并进行宏观分类以进行鉴定。植物群的相对季节性可用量是通过对手性放牧区进行分步采样来估算的。Chital会根据供应情况和植物物候学季节性改变饮食。Chital利用了42种植物属,包括草,草,矮灌木,灌木,树木和垃圾。草的消耗量从旱季的53%的生物质摄入量到雨季的95%的不等。雨季饮食中草的优势超过了相对供应量,表明强烈偏好。尽管草占旱季饮食的一半以上,但在可获得的情况下,草是最不受欢迎的植物种类,并且生长最不活跃。在干旱季节,灌木是首选的植物类型,并且最不受季节衰老的影响。在昆士兰州北部,季节性牧场的组成和数量显着不同,并且通过食用最活跃生长的植物,奇特草改变了饮食。旱季非草料的摄入量增加似乎是一种限制草质量逐步恶化所造成损害的战略。雨季饮食中草的优势超过了相对供应量,表明强烈偏好。尽管草占旱季饮食的一半以上,但在可获得的情况下,草是最不受欢迎的植物种类,并且生长最不活跃。在干旱季节,灌木是首选的植物类型,并且最不受季节衰老的影响。在昆士兰州北部,季节性牧场的组成和数量显着不同,并且通过食用最活跃生长的植物,奇特草改变了饮食。旱季非草料的摄入量增加似乎是一种限制草质量逐步恶化所造成损害的战略。雨季饮食中草的优势超过了相对供应量,表明强烈偏好。尽管草占旱季饮食的一半以上,但在可获得的情况下,草是最不受欢迎的植物种类,并且生长最不活跃。在干旱季节,灌木是首选的植物类型,并且最不受季节衰老的影响。在昆士兰州北部,季节性牧场的组成和数量显着不同,并且通过食用最活跃生长的植物,奇特草改变了饮食。旱季非草料的摄入量增加似乎是一种限制草质量逐步恶化所造成损害的战略。尽管草占旱季饮食的一半以上,但在可获得的情况下,草是最不受欢迎的植物种类,并且生长最不活跃。在干旱季节,灌木是首选的植物类型,并且最不受季节衰老的影响。在昆士兰州北部,季节性牧场的组成和数量显着不同,并且通过食用最活跃生长的植物,奇特草改变了饮食。旱季非草料的摄入量增加似乎是一种限制草质量逐步恶化所造成损害的战略。尽管草占旱季饮食的一半以上,但在可获得的情况下,草是最不受欢迎的植物种类,并且生长最不活跃。在干旱季节,灌木是首选的植物类型,并且最不受季节衰老的影响。在昆士兰州北部,季节性牧场的组成和数量显着不同,并且通过食用最活跃生长的植物,奇特草改变了饮食。旱季非草料的摄入量增加似乎是一种限制草质量逐步恶化所造成损害的战略。和Chital通过食用生长最活跃的植物来改变饮食。旱季非草料的摄入量增加似乎是一种限制草质量逐步恶化所造成损害的战略。奇异果通过食用生长最活跃的植物来改变饮食。旱季非草料的摄入量增加似乎是一种限制草质量逐步恶化所造成损害的战略。

更新日期:2020-08-20
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