调查野外捕食者围栏内景观生产力对受威胁有袋动物空间生态的影响

IF 1.6 4区 环境科学与生态学 Q3 ECOLOGY
Austral Ecology Pub Date : 2024-07-17 DOI:10.1111/aec.13566
Cassandra M. Arkinstall, Sean I. FitzGibbon, Brianna Coulter, Katherine E. Moseby, Peter J. Murray
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引用次数: 0

摘要

景观生产力和资源分散是许多物种运动模式的主要驱动因素。在生产力较低的环境中,由于个体需要走更远的路才能获得资源,因此家园范围通常较大。大山熊鼠(Macrotis lagotis)已被重新引入到几个野外捕食者隔离区,以降低其灭绝风险。了解景观生产力和资源分散如何影响大山熊的空间利用对于有效管理隔离区内的种群至关重要。我们在两个隔离区测试了三个假设:1.由于沙质基质(粘土含量为20%)适合挖掘洞穴和觅食坑,因此比熊会优先利用沙质基质的栖息地;2. 与半干旱地点相比,干旱地点的家园范围会更大,原因是生产力较低,且偏好栖息地的分布更零散;3.在干旱地区,黑嘴狒狒每晚都要走更远的路才能到达喜欢的栖息地。降雨量被用作生产力的指标,而偏好栖息地的分布则被用作资源分布的指标。研究是在平均降雨量条件下进行的,两个地点的黑熊种群密度相似。全球定位系统记录仪记录了干旱地点的 10 只黑熊和半干旱地点的 11 只黑熊的家园范围和活动情况。21只黑熊中有17只偏爱沙质基底的栖息地,而干旱地区沙质基底的数量较少。不同地点的黑熊在家园范围大小和夜间活动方面没有明显差异。我们认为,这两个地点的平均降雨量条件以及比目鱼饮食的灵活性,支持了比目鱼(尤其是雌性比目鱼)维持相对较小和稳定的家园范围。在降雨量长期低于平均水平的情况下,景观生产力和资源分散对黑熊空间利用的影响可能会更加明显。需要对低降雨量条件下(如干旱)的黑熊家园范围进行研究,以便对围栏种群进行长期有效的管理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Investigating the effects of landscape productivity on the spatial ecology of a threatened marsupial inside feral predator exclosures

Investigating the effects of landscape productivity on the spatial ecology of a threatened marsupial inside feral predator exclosures

Landscape productivity and resource dispersion are key drivers of the movement patterns of many species. In less productive environments, home ranges are generally larger as individuals travel further to access resources. The greater bilby (Macrotis lagotis) has been reintroduced to several feral predator exclosures to reduce their extinction risk. Understanding how landscape productivity and resource dispersion influence bilby space use is critical to enable effective management of populations in exclosures. At two exclosures, we tested three hypotheses: 1. Bilbies would preferentially utilize habitats with sandy substrates (<20% clay content), as they are suitable for digging burrows and foraging pits; 2. Home ranges would be larger at the arid site compared to the semi-arid site due to lower productivity and patchier distribution of preferred habitats; and 3. Bilbies would travel further each night at the arid site to access preferred habitats. Rainfall was used as an indicator of productivity, and dispersion of preferred habitats as an indicator of resource dispersion. The study was undertaken during average rainfall conditions and under similar bilby population densities at both sites. GPS loggers recorded home ranges and movements of 10 bilbies at the arid site, and 11 bilbies at the semi-arid site. Seventeen of the 21 bilbies preferentially utilized habitats with sandy substrates, which were less abundant at the arid site. There were no significant differences in home range size or nightly movements between the sites for either sex. We suggest the average rainfall conditions at both sites, and the dietary flexibility of bilbies, supported the maintenance of relatively small and stable home ranges (particularly for females). The effects of landscape productivity and resource dispersion on bilby space use are more likely to be evident during extended periods of below average rainfall. Bilby home range studies during low rainfall conditions (e.g. drought) are required for the effective, long-term management of exclosure populations.

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来源期刊
Austral Ecology
Austral Ecology 环境科学-生态学
CiteScore
2.90
自引率
6.70%
发文量
117
审稿时长
12-24 weeks
期刊介绍: Austral Ecology is the premier journal for basic and applied ecology in the Southern Hemisphere. As the official Journal of The Ecological Society of Australia (ESA), Austral Ecology addresses the commonality between ecosystems in Australia and many parts of southern Africa, South America, New Zealand and Oceania. For example many species in the unique biotas of these regions share common Gondwana ancestors. ESA''s aim is to publish innovative research to encourage the sharing of information and experiences that enrich the understanding of the ecology of the Southern Hemisphere. Austral Ecology involves an editorial board with representatives from Australia, South Africa, New Zealand, Brazil and Argentina. These representatives provide expert opinions, access to qualified reviewers and act as a focus for attracting a wide range of contributions from countries across the region. Austral Ecology publishes original papers describing experimental, observational or theoretical studies on terrestrial, marine or freshwater systems, which are considered without taxonomic bias. Special thematic issues are published regularly, including symposia on the ecology of estuaries and soft sediment habitats, freshwater systems and coral reef fish.
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