Journal for Nature Conservation最新文献

Corrigendum to “Surviving the Tide: Assessing Guiana dolphin persistence amidst growing threats in a protected estuary in South-eastern Brazil” [J. Nature Conserv. 82 (2024) 126713]

IF 2.2 3区环境科学与生态学 Q2 BIODIVERSITY CONSERVATION

Journal for Nature Conservation

Pub Date : 2024-12-01 DOI: 10.1016/j.jnc.2024.126727

Inaê Guion de Almeida , Alexandre Reis Percequillo , Mario Manoel Rollo Jr

引用次数: 0

From virtue to sin: Is the installation of bat boxes an effective conservation measure or a potential pitfall for vulnerable bat species? 从美德到罪恶：对于脆弱的蝙蝠物种来说，安装蝙蝠箱是有效的保护措施还是潜在的陷阱？

IF 2.2 3区环境科学与生态学 Q2 BIODIVERSITY CONSERVATION

Journal for Nature Conservation

Pub Date : 2024-11-26 DOI: 10.1016/j.jnc.2024.126775

Camilo Matus-Olivares , Jaime Carrasco , Andrés Weintraub , Fulgencio Lisón

Bat boxes are a key element in bat conservation policies being very popular. However, it is a biased action that is only favourable for a few bat species. In this manuscript, we hypothesize that the installation of these elements and an extensive proliferation of them could threaten other bat species more vulnerable due to the niche competition. For this, we calculated the overlapping degree between the bat species that use bat boxes and those that do not, specifically: (1) To determine the favourability area of these bat species through habitat suitability models in Iberian Peninsula; (2) To compare the overlapping degree between both bat groups; (3) To elaborate optimal maps for the installation of bat boxes through optimization algorithm; and (4) To discuss the implications for the conservation of this action. Our results showed that the overlapping between bat boxes users and the other species is high (mean 76.3 %) and there are areas where a bat boxes not user species could compete with at least 9 bat boxes user species. Therefore, the installation of bat boxes could be counterproductive, and we should focus on other conservation actions. We used an optimization algorithm to find out those areas where it is not recommendable to install them and developed a flowchart to evaluate its installation in an area. In conclusion, our study highlights that conservation actions on some occasions could be negative or be a pitfall for themselves, and it is necessary to discuss the effectiveness of certain measures for bat conservation.

蝙蝠箱是蝙蝠保护政策中的一个关键要素，非常受欢迎。然而，这种做法有失偏颇，只对少数蝙蝠物种有利。在这篇手稿中，我们假设，由于生态位竞争的原因，这些元素的安装和广泛扩散可能会威胁到其他更脆弱的蝙蝠物种。为此，我们计算了使用蝙蝠箱和不使用蝙蝠箱的蝙蝠物种之间的重叠程度，具体包括：（1）通过伊比利亚半岛的栖息地适宜性模型确定这些蝙蝠物种的有利区域；（2）比较两个蝙蝠群之间的重叠程度；（3）通过优化算法绘制安装蝙蝠箱的最佳地图；以及（4）讨论这一行动对保护的影响。结果表明，蝙蝠箱使用者与其他物种之间的重叠率很高（平均为 76.3%），在某些区域，一个蝙蝠箱非使用者物种可能与至少 9 个蝙蝠箱使用者物种竞争。因此，安装蝙蝠箱可能会适得其反，我们应该把重点放在其他保护行动上。我们使用优化算法找出了不建议安装蝙蝠箱的区域，并开发了一个流程图来评估在某个区域安装蝙蝠箱的情况。总之，我们的研究强调，在某些情况下，保护行动可能会产生负面影响或成为陷阱，因此有必要讨论某些蝙蝠保护措施的有效性。

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引用次数: 0

Predicting climate driven habitat shifts for the Egyptian vulture in Punjab, Pakistan

IF 2.2 3区环境科学与生态学 Q2 BIODIVERSITY CONSERVATION

Journal for Nature Conservation

Pub Date : 2024-11-26 DOI: 10.1016/j.jnc.2024.126774

Gulzaman William , Zafeer Saqib , Nisha Naeem , Asim Kamran , Azeem Masih , Afia Rafique

Climate change has significantly impacted habitat loss, affecting various threatened species, including the Egyptian vulture, which is experiencing a population and habitat decline in Pakistan. This study employs MaxEnt modeling to predict the current and future distribution of the Egyptian vulture across Punjab province, Pakistan, under three Shared Socio-economic Pathways (SSPs) SSP126, SSP370, and SSP585 for the years 2040, 2070, and 2100. We used 67 occurrence records and seven environmental variables to model the vulture’s distribution. The MaxEnt model exhibited good predictive performance with an AUC value of 0.837, identifying a current suitable habitat area of 122,124.16 km2. Among the environmental factors analyzed, precipitation seasonality (Bio15), mean temperature of the warmest quarter (Bio10), and precipitation of the wettest month (Bio13) emerged as the most influential variables, contributing 39.8 %, 18 %, and 8.8 %, respectively. The model predicts a substantial shift in suitable habitats under various climate scenarios, with an overall increase of 69 % in suitable habitat by 2100 under the SSP 370–2100 scenario. Significant habitat expansions are expected across central and southern Punjab, while reductions are anticipated in the northern and western regions, with significant changes in surface coverage. Furthermore, the conservation gap analysis reveals that although 2,451.63 km2 of highly suitable and 1,648.91 km2 of very highly suitable habitat exist within protected areas, more than 90 % of these habitats remain unprotected, highlighting a critical conservation gap that threatens the species’ long term survival. The insights derived from this study are critical for informing conservation efforts and habitat management practices, offering a foundational reference for the protection of the Egyptian vulture and similar species in the face of ongoing climate change.

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引用次数: 0

Paying for green tide management or participating in cleanup activities? Testing and controlling for payment vehicle bias in the valuation of ecological damage caused by green tides 为绿潮管理付费还是参与清理活动？测试和控制绿潮生态损害估值中的支付工具偏差

IF 2.2 3区环境科学与生态学 Q2 BIODIVERSITY CONSERVATION

Journal for Nature Conservation

Pub Date : 2024-11-26 DOI: 10.1016/j.jnc.2024.126772

Jingmei Li , Yani Zhang , Jingzhu Shan

Payment vehicle bias is one of the biases in the contingent valuation method (CVM). This research uses the ecological damage assessment of the Ulva prolifera green tides in Jiaozhou Bay, Qingdao, China, as a case study to examine the factors influencing the payment vehicle bias and control for it. The results indicate that nearly 50 % of respondents might refuse to pay because monetary or labor payment vehicles do not meet their payment preferences. This situation leads to nonrandom sample selection and payment vehicle bias. To address these issues, this research proposes a novel valuation framework that combines monetary and labor payment vehicles. And the Heckman two-stage model is used to estimate the economic value of labor time and combines sample data from both monetary and labor payment vehicles to control for bias and obtain a more reliable valuation result. The results show that, compared with sole reliance on monetary payment vehicles, the use of dual payment vehicles increases the observable sample size from 222 to 330. Furthermore, respondents’ average WTP for green tide management increases from 101 CNY/person·year to 116 CNY/person·year. Therefore, employing both payment vehicles simultaneously can reveal more respondents’ true preferences, reduce non-randomness in sample selection and mitigate payment vehicle bias. The findings of this study can demonstrate the value of labor payment vehicles in CVM applications and provide a scientific basis for the Qingdao municipal government to establish more effective strategies for green tide management.

支付工具偏差是或有估值法（CVM）中的偏差之一。本研究以中国青岛胶州湾绿潮莼菜生态损害评估为案例，考察了影响支付工具偏差的因素并对其进行了控制。结果表明，近 50% 的受访者可能会因为货币或劳动支付工具不符合其支付偏好而拒绝支付。这种情况会导致非随机抽样和支付工具偏差。为了解决这些问题，本研究提出了一种结合货币支付工具和劳动支付工具的新型估值框架。并采用 Heckman 两阶段模型来估算劳动时间的经济价值，同时结合货币支付工具和劳动支付工具的样本数据来控制偏差，从而获得更可靠的估算结果。结果表明，与单纯依赖货币支付工具相比，使用双重支付工具将可观测样本量从 222 个增加到 330 个。此外，受访者对绿潮管理的平均 WTP 从 101 元/人-年增加到 116 元/人-年。因此，同时采用两种支付工具可以揭示更多受访者的真实偏好，减少样本选择的非随机性，减轻支付工具的偏差。本研究的结果可以证明劳动支付工具在 CVM 应用中的价值，并为青岛市政府制定更有效的绿潮管理策略提供科学依据。

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引用次数: 0

Seasonal distribution pattern and habitat selection of the Balkan chamois on Olympus mountain: Summer heat, hikers, roads 奥林帕斯山上巴尔干麂的季节分布模式和栖息地选择：夏季高温、徒步旅行者、道路

IF 2.2 3区环境科学与生态学 Q2 BIODIVERSITY CONSERVATION

Journal for Nature Conservation

Pub Date : 2024-11-24 DOI: 10.1016/j.jnc.2024.126773

Konstantinos Papakostas , Haritakis Papaioannou , Marco Apollonio , Vassiliki Kati

The Balkan chamois (Rupicapra rupicapra balcanica) has a bad conservation status in Greece, and a national action plan will be implemented by the Ministry of Environment. We explored the seasonal distribution pattern and ecological preferences of the species on Mt. Olympus by collecting 1,182 observations of chamois occurrences across four seasonal surveys (2022–2023), and we estimated its population size (2022). The annual range of the species reached 103 km² (Kernel Density Estimator). We recorded the smallest seasonal range during autumn (rutting season), then in summer, and the largest in winter. The species followed the Mediterranean seasonal range use pattern, implying that summer is the stress period due to drought. The population size was c. 430 individuals, showing an increasing trend, but the fecundity rate was low in 2022. The Ecological Niche Factor Analysis (ENFA) showed that chamois preferred areas near hiking trails throughout the year, likely being habituated with visitors, while avoiding motorized roads, as adopted behaviors of poaching risk minimization. It also favored rocky areas and proximity to escape terrains during spring and winter. This work provides new methodological insights for habitat mapping and escape terrain definition (slope steepness and extent) and supports the suggested measures of the national action plan for implementing a roadless and road control policy, securing water availability in arid mountains, implementing a management plan for tourists, abating poaching and enlarging the hunting banning zone.

巴尔干羚羊（Rupicapra rupicapra balcanica）在希腊的保护状况不佳，环境部将实施一项国家行动计划。我们通过四次季节性调查（2022-2023 年）收集了 1,182 份羚羊出现的观测数据，探索了该物种在奥林匹亚山上的季节性分布模式和生态偏好，并估算了其种群数量（2022 年）。该物种的年活动范围达到 103 平方公里（核密度估计器）。根据我们的记录，秋季（发情期）的季节性分布范围最小，夏季最小，冬季最大。该物种遵循地中海的季节性分布模式，这意味着夏季是干旱造成的压力期。种群数量约为 430 头，呈上升趋势，但 2022 年的繁殖率较低。生态位因素分析（ENFA）显示，羚羊全年都喜欢徒步旅行路线附近的区域，可能是与游客习性相近，同时避开机动车道，以减少偷猎风险。在春季和冬季，羚羊还喜欢岩石区和靠近逃生地形的地方。这项研究为栖息地绘图和逃逸地形定义（斜坡陡度和范围）提供了新的方法论见解，并支持国家行动计划的建议措施，即实施无路和道路控制政策、确保干旱山区的水源供应、实施游客管理计划、减少偷猎和扩大禁猎区。

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引用次数: 0

Prediction of the potential dispersal corridors for Gaoligong hoolock gibbon in northern Yingjiang, Yunnan, China 中国云南盈江北部高黎贡长臂猿潜在扩散走廊预测

IF 2.2 3区环境科学与生态学 Q2 BIODIVERSITY CONSERVATION

Journal for Nature Conservation

Pub Date : 2024-11-22 DOI: 10.1016/j.jnc.2024.126771

Yong-liang Zhu , Meng-ling Xu , Li-xiang Zhang , Peng Li , Bao Jin , An-ru Zuo , Xue-long Jiang , Zhen-hua Guan

Ecological corridors are crucial for wildlife survival and development, providing niches, shelter, food, and protection that enable species to thrive and migrate. This study addresses the vulnerable status of the Gaoligong hoolock gibbon (Hoolock tianxing) population in China, which has undergone a significant decline due to habitat loss and fragmentation, resulting in 15 isolated subpopulations. To conserve the H. tianxing population through habitat restoration and corridor development, we conducted a detailed analysis of habitat patches occupied by 20 H. tianxing groups in northern Yingjiang, Yunnan. We applied a least-cost path model, enhanced by various modeling techniques, to identify potential corridors. Our findings show that integrating the Linkage Mapper Toolbox with the MaxEnt model significantly improves the accuracy of corridor identification. This approach identified 26 potential dispersal corridors crucial for maintaining connectivity among H. tianxing populations. Furthermore, we employed a circuit theory model to identify key pinch points facilitating H. tianxing dispersal and to locate barriers hindering their movement. We found that barriers to gibbon dispersal were primarily concentrated in the Lamahe area, especially near existing roads. Consequently, constructing corridors in this area is crucial for the effective conservation of H. tianxing. This study provides both a blueprint for H. tianxing conservation strategies in northern Yingjiang and identifies key protection areas, establishing a comprehensive framework for corridor construction. The insights gained from this research significantly enhance our understanding of conservation strategies and management practices specifically tailored to the ecological needs of H. tianxing populations.

生态走廊对野生动物的生存和发展至关重要，它提供了栖息地、庇护所、食物和保护，使物种得以繁衍和迁徙。由于栖息地的丧失和破碎化，中国高黎贡长臂猿（长臂猿天星）种群数量大幅减少，形成了 15 个孤立的亚种群。为了通过栖息地恢复和走廊发展来保护长臂猿种群，我们对云南盈江北部 20 个长臂猿群落所占据的栖息地斑块进行了详细分析。我们采用了一个最低成本路径模型，并通过各种建模技术加以强化，以确定潜在的走廊。我们的研究结果表明，将 Linkage Mapper 工具箱与 MaxEnt 模型相结合可显著提高走廊识别的准确性。这种方法识别出了 26 条潜在的扩散走廊，这些走廊对于保持天星毛虫种群之间的连通性至关重要。此外，我们还利用电路理论模型确定了促进天星猿扩散的关键夹点，并找到了阻碍其移动的障碍。我们发现，长臂猿扩散的障碍主要集中在喇嘛河地区，尤其是现有道路附近。因此，在这一地区建设走廊对有效保护天星长臂猿至关重要。本研究既为盈江北部的天牛保护战略提供了蓝图，也确定了重点保护区域，为廊道建设建立了一个全面的框架。这项研究获得的洞察力极大地增强了我们对针对天牛种群生态需求的保护策略和管理实践的理解。

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引用次数: 0

Riverscape analysis and habitat suitability modeling for conservation management of native crayfish species – A case study from Croatia, Slovenia and Hungary 用于本地小龙虾物种保护管理的河景分析和栖息地适宜性建模--克罗地亚、斯洛文尼亚和匈牙利的案例研究

IF 2.2 3区环境科学与生态学 Q2 BIODIVERSITY CONSERVATION

Journal for Nature Conservation

Pub Date : 2024-11-21 DOI: 10.1016/j.jnc.2024.126770

Milan Danilović , Martin Weinländer , Diana Marguč , Zsombor Bányai , Weiperth András , Leopold Füreder , Ivana Maguire

Indigenous crayfish species (ICS) have suffered a significant decline in recent decades due to various threats including anthropogenic habitat degradation with resulting fragmentation, and the introduction of non-indigenous crayfish species (NICS). However, only a few studies have assessed and quantified these threats on a broad landscape scale. We aim to highlight the impact of these interacting pressures within the Sava and Drava basins in Slovenia, Croatia, and Hungary.

Our aims were to (1) asses the fragmentation caused by artificial and natural barriers; (2) calculate a threat index using fragmentation, spatial distances to established NICS populations, urban settlements and roads; (3) conduct current habitat suitability modeling (HSM) using various biotic and abiotic environmental parameters. The target species in this area are the ICS Astacus astacus, Austropotamobius torrentium and Pontastacus leptodactylus as well as the invasive NICS Pacifastacus leniusculus and Faxonius limosus. Our analyses revealed that the Croatian and Hungarian segments of the Drava and Sava basins exhibit relatively low fragmentation levels, whereas the Slovenian basins are highly fragmented mainly due to a dense hydropower network. All ICS populations within each sub-basin in the study area are moderately to highly threatened according to our threat index calculation. The HSM showed, that only 14.1% and 11.6% of freshwater habitats are suitable for A. torrentium and A. astacus, respectively. In contrast, NICS could occupy substantial portions (up to 22%) of the total riverscape. The results affirmed the highly alarming situation, as native crayfish were once widely distributed across less unfragmented freshwaters of the Danube basin. Our analyses and findings will be helpful to enhance the existing frameworks for safeguarding the remaining ICS populations, predicting the possible spread of NICS, and help to improve sustainable management practices for freshwater ecosystems.

近几十年来，本土小龙虾物种（ICS）在各种威胁下大幅减少，这些威胁包括人类活动导致的栖息地退化和破碎化，以及非本土小龙虾物种（NICS）的引入。然而，只有少数研究在广泛的景观尺度上对这些威胁进行了评估和量化。我们的目标是：（1）评估人工和天然屏障造成的破碎化；（2）利用破碎化、与已建立的非本土小龙虾种群的空间距离、城市定居点和道路计算威胁指数；（3）利用各种生物和非生物环境参数进行当前栖息地适宜性建模（HSM）。该地区的目标物种是 ICS Astacus astacus、Austropotamobius torrentium 和 Pontastacus leptodactylus，以及入侵的 NICS Pacifastacus leniusculus 和 Faxonius limosus。我们的分析表明，德拉瓦河流域和萨瓦河流域的克罗地亚段和匈牙利段的破碎化程度相对较低，而斯洛文尼亚流域的破碎化程度很高，这主要是由于密集的水电网络造成的。根据我们的威胁指数计算，研究区内每个流域内的所有 ICS 种群都受到了中度到高度的威胁。HSM 显示，分别只有 14.1% 和 11.6% 的淡水栖息地适合 A. torrentium 和 A. astacus 生长。相比之下，NICS 可占据河流总面积的很大一部分（高达 22%）。研究结果证实了这一非常令人担忧的情况，因为本地小龙虾曾广泛分布于多瑙河流域较少破碎化的淡水中。我们的分析和研究结果将有助于加强现有框架，以保护剩余的 ICS 种群，预测 NICS 可能的扩散，并帮助改善淡水生态系统的可持续管理实践。

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引用次数: 0

Top priority crop wild relatives exhibit different resilience responses to climate change in Benin (West Africa) 贝宁（西非）最重要的作物野生近缘种对气候变化表现出不同的适应能力

IF 2.2 3区环境科学与生态学 Q2 BIODIVERSITY CONSERVATION

Journal for Nature Conservation

Pub Date : 2024-11-19 DOI: 10.1016/j.jnc.2024.126769

Rodrigue Idohou , Romaric Odoulami , Thierry Houehanou , Achille Assogbadjo

Climate change exacerbates biodiversity loss and contributes to disrupting ecosystem functioning, diminishing ecosystem services, and further endangering vulnerable populations of species. This study explores how different climate scenarios may impede the probable resilience of top-priority crop wild relatives in Benin. Records of the species were combined with climate and soil layers, in a maximum entropy modeling algorithm. For the future models, two shared socio-economic trajectories were considered: Shared Socioeconomic Pathway SSP2-4.5 and Shared Socioeconomic Pathway SSP5-8.5 from the CMPI6 scenarios for the period 2040–2070. Niche dynamics as well as similarity of the niches were assessed for all species for the proposition of sustainable conservation strategies. Results showed that all models yielded very good performance, as revealed by the AUC and TSS values. For most species, much of the distribution will remain stable across time, though some expansion or retraction will be observed in some cases. Most of the pairs of species display low similarity in the suitable areas for conservation. However, a higher similarity of the background was observed among some groups including Ipomoea and Dioscorea species. Further development of these models could help to get a complete view of the distribution of the species and set long-term conservation strategies for this group.

气候变化加剧了生物多样性的丧失，破坏了生态系统的功能，减少了生态系统的服务，并进一步危及脆弱的物种种群。本研究探讨了不同的气候情景会如何阻碍贝宁最优先作物野生近缘种的可能恢复力。在最大熵建模算法中，物种记录与气候和土壤层相结合。在未来模型中，考虑了两种共同的社会经济轨迹：共享社会经济路径 SSP2-4.5 和共享社会经济路径 SSP5-8.5，分别来自 2040-2070 年的 CMPI6 方案。为提出可持续保护战略，对所有物种的生态位动态和生态位相似性进行了评估。结果表明，从 AUC 和 TSS 值来看，所有模型的性能都非常好。对于大多数物种来说，尽管在某些情况下会出现一些扩展或回缩，但大部分物种的分布会在不同时期保持稳定。在适合保护的区域内，大多数物种对的相似度较低。不过，在一些物种组（包括红苕和薯蓣物种）中观察到了较高的背景相似性。这些模型的进一步发展有助于全面了解物种的分布情况，并为该物种群制定长期保护战略。

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引用次数: 0

Meeting crop production and restoration efforts: A case study with achiote trees as corridors 满足作物生产和恢复工作的需要：以阿奇奥特树为走廊的案例研究

IF 2.2 3区环境科学与生态学 Q2 BIODIVERSITY CONSERVATION

Journal for Nature Conservation

Pub Date : 2024-11-19 DOI: 10.1016/j.jnc.2024.126765

Marina Mazón , Oscar Romero

Productive restoration is intended to guarantee crop production whilst helping to conserve biodiversity and other ecosystem services, but the recovery of these ecosystem components and functions needs to be monitored. We used Darwin wasps (Hymenoptera: Ichneumonidae) to evaluate if an agroforestry system based on achiote trees (Bixa orellana L.) might help to conserve biodiversity by connecting areas under ecological restoration and forest remnants. We compared Darwin wasp diversity, abundance, richness, and composition in three ecosystem types: achiote orchards, areas under approximately 10 years of ecological restoration, and secondary forests, in southern Amazon of Ecuador. Insects were collected by means of Malaise trap, with three replicates for every ecosystem type. Diversity indices showed no significant differences among the three ecosystem types, but Ichneumonidae abundance and species richness did, and assemblages were significantly different among them. Of the 239 morphospecies collected, 11 were occurring in the three ecosystems. Monospecific agroforestry plantations, such as the achiote farms studied here, can be useful to help with recovery of ecosystem services and biodiversity when land is severely degraded, if they are managed with organic practices and they are close to the forests, but might not act as effective corridors for Darwin wasps.

恢复生产的目的是保证作物产量，同时帮助保护生物多样性和其他生态系统服务，但需要对这些生态系统组成部分和功能的恢复情况进行监测。我们利用达尔文黄蜂（膜翅目：Ichneumonidae）来评估以阿奇霉素树（Bixa orellana L.）为基础的农林系统是否有助于通过连接生态恢复区和森林残留区来保护生物多样性。我们比较了三种生态系统类型中达尔文黄蜂的多样性、丰度、丰富度和组成：厄瓜多尔亚马逊南部的阿奇奥特果园、约 10 年的生态恢复区和次生林。昆虫是通过马拉伊斯诱捕器收集的，每种生态系统类型有三个重复。结果表明，三种生态系统类型之间的多样性指数没有显著差异，但恙虫科昆虫的丰度和物种丰富度有显著差异，昆虫群落也有显著差异。在收集到的 239 个形态物种中，有 11 个出现在三种生态系统中。在土地严重退化的情况下，如果采用有机方法进行管理，并且靠近森林，单种农林业种植园（如本文研究的赤眼蜂农场）可能有助于生态系统服务和生物多样性的恢复，但可能无法成为达尔文黄蜂的有效走廊。

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引用次数: 0

Small-scale removal of an emergent coastal weed does not affect space use of a territorial bird which uses those weeds 小规模清除沿海的新生杂草不会影响使用这些杂草的领地鸟类对空间的利用

IF 2.2 3区环境科学与生态学 Q2 BIODIVERSITY CONSERVATION

Journal for Nature Conservation

Pub Date : 2024-11-17 DOI: 10.1016/j.jnc.2024.126767

Anthony R. Rendall , Emma Carlos , Maria Gibson , Michael A. Weston

Management of impactful, non-native vegetation – commonly referred to as weeds – is an important component of coastal management, yet information on how their management might affect coastal fauna is limited. A common focus of existing studies is the assessment of species richness or activity before and after weed removal while direct experimental assessments of individual activity ranges are rare. We individually marked singing honeyeaters (Gavicalis virescens) throughout Cheetham Wetlands, Victoria, Australia, where African boxthorn (Lycium ferocissimum) invasion was extensive, often represented the tallest vegetation structure within coastal saltmarsh/grassland and was used extensively by singing honeyeaters. Individual birds were repeatedly located to establish range sizes before and after removal of boxthorn. Four sites were considered ‘impact’ sites, where two boxthorn plants (6.7–33.3 % of plants present) were removed, cut down and branches left in situ to retain some habitat structure. Two sites represented controls, where no boxthorn removal occurred. Honeyeater activity range size did not change in response to weed removal, and range overlap pre- and post-removal was high (80 ± 23 %,

\bar{μ}

± SD) – although variation of range size at the individual-level was high. Boxthorn represented the most frequently used perch type both before and after removal, as dead boxthorn was also used for perching. Our results suggest the small-scale, selective, weed management that seeks to retain vegetation structure has negligible immediate impacts on singing honeyeaters inhabiting coastal areas.

对有影响的非本地植被--通常称为杂草--的管理是沿岸管理的一个重要组成部分，但有关其管理如何影响沿岸动物的资料却很有限。现有研究的一个共同重点是评估杂草清除前后的物种丰富度或活动，而对个体活动范围的直接实验评估却很少见。我们在澳大利亚维多利亚州的 Cheetham 湿地对歌唱蜜鸟（Gavicalis virescens）进行了个体标记，那里非洲黄刺李（Lycium ferocissimum）的入侵范围很广，通常是沿海盐沼/草地中最高的植被结构，歌唱蜜鸟也广泛使用。我们对鸟类个体进行了反复定位，以确定移除黄刺玫前后鸟类的活动范围。四个地点被视为 "影响 "地点，其中两株黄荆树（占现有植物的 6.7-33.3%）被移除、砍伐，树枝留在原地，以保留一些栖息地结构。两个地点为对照地点，没有移除黄杨。食蜜鸟的活动范围大小并未因杂草被移除而改变，移除前后的活动范围重叠率很高（80 ± 23 %，μ¯± SD）--尽管个体水平的活动范围大小差异很大。黄荆是移除前后最常用的栖木类型，因为枯死的黄荆也被用来栖息。我们的研究结果表明，旨在保留植被结构的小规模、选择性杂草管理对栖息在沿海地区的食蜜鸟的直接影响微乎其微。

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