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首页> 外文期刊>Wildlife Research >Macropod habitat use and response to management interventions in an agriculturalforest mosaic in north-eastern Tasmania as inferred by scat surveys
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Macropod habitat use and response to management interventions in an agriculturalforest mosaic in north-eastern Tasmania as inferred by scat surveys

机译：粪便调查推断，塔斯马尼亚州东北部农林马赛克中的巨足类动物栖息地使用和对管理干预措施的反应

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Context. Native pest herbivores often require population numbers to be controlled in landscape settings where agricultural, plantation forests and native forests are juxtaposed. The Tasmanian pademelon Thylogale billardierii and the red-necked wallaby Macropus rufogriseus rufogriseus are among the most abundant native pest herbivore species in Tasmania. Aims. We aimed to determine the habitat use of pademelons and wallabies in response to (i) environmental and seasonal variation, and (ii) two different wildlife management interventions (shooting and fencing) in an agricultural-forest mosaic in north-eastern Tasmania. Methods. Macropod abundance before and after shooting and fencing management interventions were estimated by changes in the rate of deposition of faecal pellets (scats per unit area per time interval) on an array of permanent transects that were stratified across three habitat types (agricultural land, plantation forest, and native forest). An experiment was also conducted to determine the endurance of fresh scats in the three habitats. Key results. More than 90% of scats remained undecomposed for over five months, and more than 50% of scats remained undecomposed for over 11 months across the study site. Decomposition rates were significantly influenced by habitat type, specifically, highest in agricultural land and lowest in native forest for both species. Scat deposition rates showed that species abundance was influenced by habitat type and season. Macropod abundance was highest in agricultural land and lowest in native forest. Compared with summer and early autumn, pademelon scat abundance significantly decreased in late autumn and spring on agricultural land but showed no change for plantation forest or native forest. Wallaby scats showed similar seasonal trends for all three habitats, lower in late autumn and spring compared with summer and early autumn. Following each of the management interventions, macropod scat deposition rates decreased predominantly on agricultural land. This effect decreased with increasing distance from intervention loci. Conclusions. We demonstrate that scat monitoring provides a useful survey technique for the assessment of macropod habitat use, and show that macropods select for agricultural habitats. Shooting and fencing interventions reduced the use of agricultural habitats, but this effect was localised. Implications.Awhole-landscape perspective is required whenassessing the impacts of management interventions on pest populations. Results highlight the formidable challenges in controlling native herbivores in habitat mosaics, given the localised effects of management interventions and the importance of environmental and seasonal factors as drivers of habitat use.
机译：上下文。本地害虫草食动物通常要求在农业，人工林和本地森林并列的景观环境中控制种群数量。塔斯马尼亚的塔德梅隆Thylogale billardierii和红颈袋鼠Macropus rufogriseus rufogriseus是塔斯马尼亚州最丰富的原生害虫草食动物物种。目的我们旨在确定塔德瓜和小袋鼠的栖息地利用，以应对（i）环境和季节变化，以及（ii）塔斯马尼亚岛东北部的一片农林马赛克中的两种不同的野生动植物管理干预措施（射击和围栏）。方法。射击和围栏管理干预之前和之后的巨足类动物丰度是通过在三种生境类型（农业用地，人工林）上分层的一系列永久样带上的粪便颗粒（粪便单位时间单位面积的粪便）的沉积速率的变化来估算的以及原生森林）。还进行了一项实验，以确定三个栖息地中新鲜粪便的耐力。关键结果。在整个研究地点中，超过90％的粪便在五个月以上未分解，超过50％的粪便在11个月以上未分解。分解速率受栖息地类型的影响很大，特别是，对于这两种物种，其耕地的分解率最高，而原生林的分解率最低。粪便沉积速率表明物种丰富度受生境类型和季节的影响。巨足类的丰度在农业用地中最高，而在原生林中最低。与夏季和秋季初相比，农田土地上的pad豆粪便的丰度在秋季末期和春季明显减少，但对于人工林或原生林则没有变化。袋鼠的粪便在所有三个栖息地均表现出相似的季节性趋势，与夏季和初秋相比，秋季末和春季低。在执行每种管理干预措施之后，农田上的大脚d粪便沉积率主要下降。随着距干预位点距离的增加，该效应降低。结论。我们证明粪便监测为巨足动物栖息地的使用评估提供了一种有用的调查技术，并表明巨足动物选择了农业栖息地。射击和击剑干预减少了农业生境的使用，但是这种影响是局部的。含义。在评估管理干预措施对有害生物种群的影响时，需要从整个景观角度入手。考虑到管理干预措施的局部影响以及环境和季节性因素作为栖息地使用驱动因素的重要性，结果突出了在控制栖息地镶嵌图中的天然草食动物方面的巨大挑战。

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