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Prescribed burning benefits threatened mammals in northern Australia
Biodiversity and Conservation ( IF 3.4 ) Pub Date : 2020-06-30 , DOI: 10.1007/s10531-020-02010-9
Ian J. Radford , , Leigh-Ann Woolley , Ben Corey , Tom Vigilante , Ed Hatherley , Richard Fairman , Karin Carnes , Antony N. Start

Despite substantial investment in prescribed burning for biodiversity conservation there has been surprisingly little demonstration of its efficacy in achieving intended conservation aims for fauna. In the case of northern Australia’s threatened mammal fauna, most studies have reported negative responses to fire. We used satellite-derived fire scar imagery and small mammal survey data to compare fire regimes and threatened mammal abundance before and after implementation of broad-scale prescribed burning in north-western Australia. Specifically, we tested: (1) whether prescribed burning was effective in changing fire regimes; (2) whether all mammal species and functional groups responded to prescribed burning; and (3) what regional fire and environmental variables explained changes in mammal status. Low-intensity, patchy prescribed burning in the early dry season reduced the extent of high intensity late dry season wildfires. In sandstone habitats the abundance of all mammals, and the large marsupials and specialist rodent functional groups, increased concurrently with early dry season prescribed burning. All mammals and the small dasyurid functional group in woodland habitats also increased during this period. Early dry season prescribed burning extent was the strongest explanatory variable for mammal increases. Early dry season burning was also the strongest explanatory variable for woodland mammal abundance, but these mammals also had a positive association with extent of large patches of old growth vegetation (> 4 years since fire). Generalist rodents did not respond to prescribed burning and two other species declined following prescribed burning in one habitat. Generalist rodents and the two declining species had a negative association with extent of late dry season fire and a positive association with old growth vegetation (interacting with patch size). These results suggest an increased application of patchy early dry season prescribed burning of up to ca. 30% of the area will benefit positive fire responder species of threatened mammals including large specialist rock/arboreal rodents and most marsupial species. For mammals such as generalist terrestrial rodents with predominantly negative associations with fire, managers should seek to increase the size and extent of old growth vegetation.



中文翻译:

规定的燃烧益处威胁着澳大利亚北部的哺乳动物

尽管在用于生物多样性保护的处方燃烧方面进行了大量投资,但令人惊讶的是,几乎没有证据表明其在实现预定的动物保护目标方面的功效。以澳大利亚北部受威胁的哺乳动物为例,大多数研究都报告了对火的负面反应。我们使用卫星衍生的火疤图像和小型哺乳动物调查数据来比较澳大利亚西北部实施大规模处方燃烧前后的火情和威胁哺乳动物的丰度。具体来说,我们测试了:(1)规定的燃烧在改变火势方面是否有效;(2)是否所有的哺乳动物物种和功能组都对规定的燃烧作出反应;(3)哪些区域火灾和环境变量解释了哺乳动物状况的变化。低强度 在旱季初期规定的不规则燃烧减少了旱季后期野火的高强度程度。在砂岩生境中,所有哺乳类动物,大型有袋动物和专门的啮齿动物功能群的数量都与旱季早期规定的燃烧同时增加。在此期间,林地生境中的所有哺乳动物和小型达苏里德功能群也有所增加。旱季早期规定的燃烧程度是哺乳动物增加的最强解释变量。旱季早期燃烧也是林地哺乳动物丰度的最强解释变量,但这些哺乳动物还与大片的旧生长植被(距火灾> 4年)的程度呈正相关。多才多艺的啮齿动物对指定的燃烧没有反应,并且在一个栖息地进行规定的燃烧后,另外两个物种下降。多才多艺的啮齿动物和两个下降的物种与旱季后期火灾的程度呈负相关,与旧的生长植被呈正相关(与斑块大小相互作用)。这些结果表明,增加了斑驳的早期干旱季节的使用,规定的燃烧时间最多可达约30分钟。该地区30%的地区将受益于受威胁哺乳动物的积极火力响应物种,包括大型专业岩石/树栖啮齿动物和大多数有袋动物。对于哺乳动物,例如多栖陆生啮齿动物,其主要与火有消极关联,管理人员应设法增加旧生长植被的大小和范围。多才多艺的啮齿动物和两个下降的物种与旱季后期火灾的程度呈负相关,与旧的生长植被呈正相关(与斑块大小相互作用)。这些结果表明,增加了斑驳的早期干旱季节的使用,规定的燃烧时间最多可达约30分钟。该地区30%的地区将受益于受威胁哺乳动物的积极火警物种,包括大型专业岩石/树栖啮齿动物和大多数有袋动物。对于哺乳动物,例如多栖陆生啮齿动物,其主要与火有消极关联,管理人员应设法增加旧生长植被的大小和范围。多才多艺的啮齿动物和两个下降的物种与旱季后期火灾的程度呈负相关,与旧的生长植被呈正相关(与斑块大小相互作用)。这些结果表明,增加了斑驳的早期干旱季节的使用,规定的燃烧时间最多可达约30分钟。该地区30%的地区将受益于受威胁哺乳动物的积极火力响应物种,包括大型专业岩石/树栖啮齿动物和大多数有袋动物。对于哺乳动物,例如多栖陆生啮齿动物,其主要与火有消极关联,管理人员应设法增加旧生长植被的大小和范围。这些结果表明,增加了斑驳的早期干旱季节的使用,规定的燃烧时间最多可达约30分钟。该地区30%的地区将受益于受威胁哺乳动物的积极火力响应物种,包括大型专业岩石/树栖啮齿动物和大多数有袋动物。对于哺乳动物,例如多栖陆生啮齿动物,其主要与火有消极关联,管理人员应设法增加旧生长植被的大小和范围。这些结果表明,增加了斑驳的早期干旱季节的使用,规定的燃烧时间最多可达约30分钟。该地区30%的地区将受益于受威胁哺乳动物的积极火警物种,包括大型专业岩石/树栖啮齿动物和大多数有袋动物。对于哺乳动物,例如多栖陆生啮齿动物,其主要与火有消极关联,管理人员应设法增加旧生长植被的大小和范围。

更新日期:2020-07-01
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