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Transformative trends: Population growth, social dynamics and range expansion of Asiatic Lions in Gujarat, India 转型趋势:印度古吉拉特邦亚洲狮的人口增长、社会动态和范围扩张
IF 3.4 2区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION Pub Date : 2025-12-05 DOI: 10.1016/j.gecco.2025.e04008
Mohan Ram, Ram Ratan Nala, Sanjay Kumar Srivastava, Jaipal Singh, Anirudh Partap Singh
The Asiatic lion represents one of the most successful conservation recoveries among large carnivores across the globe. Findings from the 16th lion population estimation assessed abundance using minimal total count, distribution, habitat use, and social organisation of lions. Using a robust multi-step methodology involving 3254 trained personnel, individual identification was achieved through body markings, and duplication handling was conducted via direct observations and artificial intelligence (SIMBA), resulting in an estimated total of 891 lions. Of these, 196 were adult males, 330 adult females, 140 sub-adults, and 225 cubs. The population increased by 32.20 % then 2020 (n = 674). Simultaneously, the range of lions expanded to approximately 35,000 km², a 16.67 % increase since 2020. The landscape now comprises a core and nine satellite populations, including newly recolonised habitats such as Barda Wildlife Sanctuary, which now holds 17 lions after nearly 146 years. Habitat use analysis revealed the highest lion presence in forests, followed by wastelands and agricultural lands, with minimal use of built-up areas. The social structure remains female-biased (adult males: females = 1:1.68), with a strong cub cohort and balanced sub-adult segment, indicating long-term demographic stability. This conservation success has been underpinned by government commitment, strong political will, community support, adaptive management in multi-use landscapes, robust protection, and systematic long-term monitoring of lions and their prey base. Collectively, these findings highlight the resilience of Asiatic lions and the importance of sustained conservation vigilance to ensure the long-term persistence of this iconic species.
亚洲狮代表了全球大型食肉动物中最成功的保护恢复之一。第16次狮子种群估计的结果使用最小总数、分布、栖息地利用和狮子的社会组织来评估丰度。使用强大的多步骤方法,涉及3254名训练有素的人员,通过身体标记实现个体识别,并通过直接观察和人工智能(SIMBA)进行重复处理,估计总共有891只狮子。其中成年雄性196只,成年雌性330只,亚成年140只,幼崽225只。到2020年,人口增长了32.20 % (n = 674)。与此同时,狮子的活动范围扩大到大约35,000 平方公里,自2020年以来增长了16.67 %。这片土地现在包括一个核心种群和九个卫星种群,包括最近重新定居的栖息地,如巴尔达野生动物保护区,经过近146年的发展,现在拥有17只狮子。栖息地利用分析显示,森林中的狮子数量最多,其次是荒地和农田,建成区的狮子数量最少。社会结构仍然以雌性为主(成年雄性:雌性= 1:1.68),幼崽群体强大,亚成年群体平衡,表明人口结构长期稳定。政府的承诺、强烈的政治意愿、社区的支持、多用途景观的适应性管理、强有力的保护以及对狮子及其猎物基地的系统长期监测,为保护狮子取得成功奠定了基础。总的来说,这些发现突出了亚洲狮的恢复能力,以及保持保护警惕以确保这一标志性物种长期存在的重要性。
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引用次数: 0
Does repeated darting of lions affect their habitat selection and tourist-viewing opportunities? 狮子的反复奔跑是否会影响它们的栖息地选择和游客观赏的机会?
IF 3.4 2区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION Pub Date : 2025-12-03 DOI: 10.1016/j.gecco.2025.e04007
Douglas Branch , Teja Curk , Ruben Portas , Claudine Cloete , Jörg Melzheimer , Ortwin Aschenborn , Miha Krofel
Increasing numbers of animals are captured every year for the deployment of bio-loggers to collect data for scientific research. This usually requires immobilisation and handling by researchers, sometimes repeatedly on the same individuals, and has the potential to change the spatial behaviour of captured animals, such as avoiding humans and human infrastructure. This is especially relevant for species like lions (Panthera leo), which are among the most studied carnivores and at the same time globally one of the most sought-after species for wildlife-viewing tourism. Here, we used habitat-selection functions to examine habitat selection of lions after being chemically immobilised, some of them repeatedly, by darting from a car. Our study focused on the central part of the Etosha National Park, Namibia, a protected area with a large, but spatially and temporally regulated tourist presence. We found that captured lions did not avoid tourist camps, roads or waterholes, despite high numbers of tourists at these sites. Lions also did not change their habitat selection in relation to tourist infrastructure dependent on how many times they were darted (once vs twice) nor with time since darting. Our study indicated that in a protected area with strictly controlled tourist movements (restriction to tourist roads and daytime periods), tourism has a minimal impact on the movement of lions. Furthermore, repeated darting and chemical immobilisation did not seem to reduce lion-viewing possibilities for tourists during our study. These findings are crucial for shaping more effective policy, research and visitor management strategies. Implementing similar measures in other protected areas such as a zero-tolerance policy for off-road driving and restricting tourist activity to daytime hours (i.e. when carnivores are less active) can help minimize the effects of tourism on wildlife.
每年越来越多的动物被捕获,用于部署生物记录仪,为科学研究收集数据。这通常需要研究人员固定和处理,有时在同一个体上重复,并且有可能改变捕获动物的空间行为,例如避开人类和人类基础设施。这对狮子这样的物种尤其重要,狮子是研究最多的食肉动物之一,同时也是全球野生动物观赏旅游中最受欢迎的物种之一。在这里,我们使用栖息地选择函数来检查狮子在被化学固定后的栖息地选择,其中一些狮子反复地从汽车上跳下来。我们的研究集中在纳米比亚埃托沙国家公园的中心部分,这是一个保护区,拥有大量的游客,但在空间和时间上受到监管。我们发现,被捕获的狮子不会避开游客营地、道路或水坑,尽管这些地方有很多游客。狮子也没有改变它们的栖息地选择,这与旅游基础设施有关,这取决于它们被撞了多少次(一次还是两次),也不取决于撞后的时间。我们的研究表明,在严格控制游客活动的保护区(限制旅游道路和白天时段),旅游业对狮子活动的影响最小。此外,在我们的研究中,反复的投掷和化学固定似乎并没有减少游客观看狮子的可能性。这些发现对于制定更有效的政策、研究和游客管理策略至关重要。在其他保护区实施类似措施,例如对越野驾驶采取零容忍政策,并将旅游活动限制在白天(即食肉动物不太活跃的时候),可以帮助最大限度地减少旅游对野生动物的影响。
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引用次数: 0
Multi-criteria Geographic Information System (GIS) approach to aquaculture site selection: Balancing sustainable aquaculture development and fish biodiversity conservation in White Volta Basin, Ghana 基于多标准地理信息系统(GIS)的水产养殖选址方法:平衡加纳White Volta盆地水产养殖可持续发展与鱼类生物多样性保护
IF 3.4 2区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION Pub Date : 2025-12-03 DOI: 10.1016/j.gecco.2025.e04003
Abdou Orou-Seko , Martin Nyaaba Adokiya
Achieving the increasing global protein demand relies mainly on wild fisheries and aquaculture. However, unplanned expansion threatens freshwater fish biodiversity through environmental degradation. Despite this risk, research on aquaculture site suitability primarily focuses on cage systems, with little attention to inland pond aquaculture. Existing approaches often overlook contributions on wild fish biodiversity and key environmental factors. This study developed a spatially explicit framework to assess land suitability for sustainable earthen pond aquaculture in Ghana’s White Volta Basin (WVB), integrating biodiversity conservation objectives. We employed a multi-criteria Geographic Information System (GIS) approach and Analytical Hierarchy Process (AHP), to evaluate soil properties, topography, infrastructure, land use, and ecological constraints (proximity to critical fish habitats) to identify priority zones. Ten thematic raster layers were processed in Quantum Geographic Information System (QGIS), reclassified into “not suitable’, moderately suitable, most suitable”, and integrated via weighted overlay analysis. The results revealed that 5.6 % (173.08 km²) of the WVB basin was “most suitable” for aquaculture, while 60 % (1851.35 km²) was moderately suitable, highlighting the scarcity of high-suitability areas. Additionally, the results showed that land use/land cover, topography, and infrastructure attributes played a significant role in assessing land suitability for pond aquaculture compared to soil factors in the study setting. These findings underscore the need for strategic spatial planning and adaptive management to balance aquaculture development with freshwater habitat conservation, especially in data-limited regions.
实现日益增长的全球蛋白质需求主要依靠野生渔业和水产养殖。然而,无计划的扩张通过环境退化威胁着淡水鱼的生物多样性。尽管存在这种风险,但对养殖场地适宜性的研究主要集中在网箱系统上,很少关注内陆池塘养殖。现有的方法往往忽略了对野生鱼类生物多样性和关键环境因素的贡献。本研究结合生物多样性保护目标,开发了一个空间明确的框架来评估加纳White Volta盆地(WVB)可持续土塘水产养殖的土地适宜性。我们采用多标准地理信息系统(GIS)方法和层次分析法(AHP)来评估土壤性质、地形、基础设施、土地利用和生态限制(接近关键鱼类栖息地),以确定优先区域。在量子地理信息系统(QGIS)中对10个主题栅格层进行处理,将其重新分类为“不适合”、“中等适合”、“最适合”,并通过加权叠加分析进行综合。结果表明,WVB流域“最适宜”养殖面积为5.6% %(173.08 km²),“中等适宜”养殖面积为60 %(1851.35 km²),高适宜区稀缺。此外,研究结果表明,与土壤因素相比,土地利用/土地覆盖、地形和基础设施属性在评估池塘水产养殖土地适宜性方面发挥了重要作用。这些发现强调需要进行战略性空间规划和适应性管理,以平衡水产养殖发展与淡水生境保护,特别是在数据有限的地区。
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引用次数: 0
The current status of the East Asian population of the Dalmatian Pelican (Pelecanus crispus) along the East Asian-Australasian flyway 东亚-澳大拉西亚飞行路线上达尔马提亚鹈鹕东亚种群的现状
IF 3.4 2区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION Pub Date : 2025-12-02 DOI: 10.1016/j.gecco.2025.e04002
Shengwu Jiao , Amarkhuu Gungaa , Kexun Lou , Ming Wu , Guangchun Lei , Yanyan Li , Waner Liang , Yifei Jia
The East Asian population of the Dalmatian Pelican (Pelecanus crispus) is the least studied and most endangered of the species’ three biogeographic populations. We conducted the first synchronised wintering count of the population and satellite-tracked three immature individuals. Based on the wintering count, we estimated the size of the East Asian population at around 170–180 individuals, exceeding previous estimates. We discovered two migratory routes of the immature Dalmatian Pelicans, including a conventional route connecting China-Mongolia and an alternative route connecting China-Kazakhstan. These findings provide the first documented evidence of interactions linking the East Asian population with the South-west Asia & South Asia population. We discovered 55 sites important to the East Asian population; 78.2 % had not been previously identified, and 83.6 % are outside the current protected area network. We present the most detailed description of the migration of the East Asian population of the Dalmatian Pelican to date and call for immediate conservation of the Ruian Coastal Wetland, the Oujiang River Mouth, the Jiaolai River, and Baole Haote Haizi and its surrounding areas.
达尔马提亚鹈鹕(pelenanus crispus)的东亚种群是该物种三个生物地理种群中研究最少和最濒危的。我们对种群进行了第一次同步越冬计数,并对三只未成熟的个体进行了卫星跟踪。根据越冬数量,我们估计东亚种群的规模约为170-180只,超过了之前的估计。我们发现了幼鹈鹕的两条迁徙路线,一条是连接中国-蒙古的常规路线,另一条是连接中国-哈萨克斯坦的替代路线。这些发现为东亚人口与西南亚和南亚人口之间的相互作用提供了第一个文献证据。我们发现了55个对东亚人口很重要的地点;78.2% %以前没有被识别,83.6 %在当前的保护区网络之外。我们对东亚达尔马提亚鹈鹕种群的迁徙进行了迄今为止最详细的描述,并呼吁立即保护瑞安沿海湿地、瓯江口、胶莱河、宝乐浩特海子及其周边地区。
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引用次数: 0
Cetaceans exhibit region-specific habitat preferences across tropical waters 鲸类动物在热带水域表现出特定区域的栖息地偏好
IF 3.4 2区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION Pub Date : 2025-12-02 DOI: 10.1016/j.gecco.2025.e04001
Auriane Virgili , Lily Houles , Ghislain Dorémus , Charlotte Lambert , Sophie Laran , Jérôme Spitz , Olivier Van Canneyt , Renaud Bañuls , Vincent Ridoux
To implement effective and appropriate conservation measures, especially in less studied tropical areas, a better understanding of cetacean distribution and habitat preferences is needed. Our aim was to predict the distribution of cetaceans in five tropical marine subregions and to compare their habitat preferences in subregions located in three different oceans. Using data collected during the large-scale REMMOA aerial surveys, we created species distribution models based on sighting data and environmental variables integrated over the water column and transformed using principal component analysis for eight cetacean species groups. We summarised the distribution maps using hierarchical clustering on principal components to highlight distribution patterns common to species groups in the different subregions. Overall, no species group exhibited similar relationships with environmental conditions across all subregions, though certain species groups did show comparable relationships with specific variables in certain subregions. This suggests that cetaceans exhibit region-specific habitat preferences across tropical waters, with certain distribution drivers operating similarly for some populations in some subregions. In particular, most species groups favoured oceanographic structures such as continental slopes, while others, mainly continental shelves, were only preferred by a few species groups. Finally, we found that the distribution patterns of species groups were congruent within oceanographic subregions. These results will inform marine spatial planning for conservation and maritime development purposes, and can also be used to relocate maritime activities to areas where they will have a lesser impact, i.e. away from areas with high cetacean densities that support vital activities such as feeding and reproduction.
为了实施有效和适当的保护措施,特别是在研究较少的热带地区,需要更好地了解鲸类的分布和栖息地偏好。我们的目的是预测鲸类在五个热带海洋次区域的分布,并比较它们在三个不同海洋次区域的栖息地偏好。利用大型REMMOA航测数据,基于观测数据和水柱上的环境变量,建立了8个鲸类类群的物种分布模型,并利用主成分分析对其进行了转换。我们利用主成分的分层聚类对分布图进行了总结,以突出不同亚区物种群的共同分布模式。总体而言,没有一个物种组与所有亚区域的环境条件表现出相似的关系,尽管某些物种组确实与某些亚区域的特定变量表现出可比的关系。这表明鲸类动物在热带水域表现出特定区域的栖息地偏好,某些分布驱动因素在某些次区域的某些种群中起着类似的作用。特别是,大多数物种群喜欢海洋结构,如大陆斜坡,而其他物种,主要是大陆架,只有少数物种群喜欢。最后,我们发现各海洋分区内的物种群分布格局是一致的。这些结果将为海洋保育和海洋发展规划提供参考,也可用于将海洋活动迁移到影响较小的地区,即远离鲸类密度高的地区,这些地区支持重要的活动,如觅食和繁殖。
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引用次数: 0
Macrobenthic community characteristics in seagrass beds of Guangdong Province, South China: Linkages to seagrass vegetation and sedimentary conditions 广东省海草床大型底栖生物群落特征:与海草植被和沉积条件的关系
IF 3.4 2区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION Pub Date : 2025-12-02 DOI: 10.1016/j.gecco.2025.e03999
Kaiyun Chen , Qinghua Chen , Chao Zhong , Yaqin Liao , Mengmeng Zhao , Haozhi Sui , Hong Du , Weijie Liu , Jing Chen
Seagrass macrobenthic communities, as a critical component of seagrass ecosystems, interact with seagrasses and their habitats to form the seagrass ecosystem and provide essential ecological services. Owing to the intricate relationships between macrobenthic community structures, seagrass vegetation, and sedimentary conditions are not fully studied, we conducted a comprehensive survey from August 2021 to April 2023, investigating 14 seagrass ecosystems associated macrobenthic communities, and their sedimentary conditions in Guangdong Province, South China. The Abundance/Biomass Comparison curve indicated that the macrobenthic community structure in Guangdong is unstable and is greatly affected by external disturbances. Correlation analysis and principal component analysis revealed complex relationships between the macrobenthic community structure and seagrass vegetation and environmental factors. Overall, seagrass and macrobenthos had a significant correlation with the sediment type. However, non-metric Multidimensional Scaling ordination showed that some communities clustering did not completely follow the grain size distribution pattern, likely due to anthropogenic pressures Equation model, suggested that seagrasses and macrobenthos synergistically modify sediment physicochemical properties, fostering nutrient-rich habitats. These interactions promote biodiversity, ecosystem stability, and the maintenance of optimal seagrass habitats.
海草大型底栖生物群落作为海草生态系统的重要组成部分,与海草及其栖息地相互作用,形成海草生态系统,提供重要的生态服务。由于大型底栖生物群落结构、海草植被与沉积条件之间的复杂关系尚未得到充分研究,我们于2021年8月至2023年4月对广东省14个海草生态系统相关的大型底栖生物群落及其沉积条件进行了全面调查。丰度/生物量比较曲线表明,广东大型底栖动物群落结构不稳定,受外界干扰影响较大。相关分析和主成分分析揭示了大型底栖动物群落结构与海草植被和环境因子之间的复杂关系。总体而言,海草和大型底栖动物与沉积物类型具有显著的相关性。然而,非度量的多维尺度排序显示,由于人为压力方程模型的影响,一些群落的聚集并不完全遵循粒度分布模式,这表明海草和大型底栖动物协同改变了沉积物的物理化学性质,形成了富营养化的栖息地。这些相互作用促进了生物多样性、生态系统的稳定性,并维持了最佳的海草栖息地。
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引用次数: 0
Hunting shapes wildlife behavioural responses to non-lethal recreational activities in a protected area 狩猎塑造了野生动物对保护区内非致命性娱乐活动的行为反应
IF 3.4 2区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION Pub Date : 2025-12-01 DOI: 10.1016/j.gecco.2025.e03994
Anne Peters , Nicolas Ferry , Carsten F. Dormann , Marco Heurich
Hunting and non-lethal recreational activities are often conducted in the same or neighbouring areas of natural environments, and both trigger responses in wildlife that resemble anti-predator behaviour. A limited amount of research has assessed the combined effects of non-lethal human activities and hunting on non-target species, although understanding these effects is crucial for wildlife conservation and protected area management. This study examined the effects of different recreation and hunting intensities on the probability of detecting red deer (Cervus elaphus), roe deer (Capreolus capreolus), wild boar (Sus scrofa), red fox (Vulpes vulpes) and Eurasian lynx (Lynx lynx). Data were collected from 61 pairs of camera traps placed in the Bavarian Forest National Park, Germany, with one camera from the pair placed on a trail and the other at a nearby location within the forest. Recurrent event analysis was used to estimate the temporal dynamics of the wildlife event rate within 24 h following a recreation event. Increased hunting intensity led to a significantly increasing avoidance of recreational activities by all species, independent of whether they were subjected to hunting or not (estimate −0.009 – 0.012, depending on species and camera placement). Proximity to recreational activities impacted the spatio-temporal interactions between wildlife and recreationists, with higher levels of recreation leading to a shorter time period during which animals returned to the respective location. Thus, for conservation management, restricting non-lethal recreational activities and improving their management while limiting hunting pressure are crucial to minimise human impacts and preserve ecological integrity.
狩猎和非致命的娱乐活动通常在相同或邻近的自然环境中进行,两者都会引发野生动物类似于反捕食者行为的反应。数量有限的研究评估了非致命性人类活动和狩猎对非目标物种的综合影响,尽管了解这些影响对野生动物保护和保护区管理至关重要。本研究考察了不同的娱乐和狩猎强度对马鹿(Cervus elaphus)、狍子(Capreolus Capreolus Capreolus)、野猪(Sus scrofa)、红狐(Vulpes Vulpes)和欧亚猞猁(lynx lynx)被发现概率的影响。数据来自德国巴伐利亚森林国家公园的61对相机陷阱,其中一对相机放置在小径上,另一个放置在森林附近的位置。使用循环事件分析来估计休闲活动后24 h内野生动物事件率的时间动态。狩猎强度的增加导致所有物种对娱乐活动的回避显著增加,这与它们是否受到狩猎无关(估计值为- 0.009 - 0.012,取决于物种和摄像机的放置)。游憩活动的临近影响了野生动物与游憩者之间的时空相互作用,游憩活动水平越高,动物返回相应地点的时间越短。因此,在保育管理方面,限制非致命的康乐活动,并在限制狩猎压力的同时改善康乐活动的管理,对尽量减少人为影响和保护生态完整至关重要。
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引用次数: 0
Insights into vertebrate diversity of Qatar from first systematic camera trapping 从第一个系统摄像机捕捉到卡塔尔脊椎动物多样性的见解
IF 3.4 2区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION Pub Date : 2025-12-01 DOI: 10.1016/j.gecco.2025.e03985
Shakeel Ahmad , Muhammad Ali Nawaz , Fatima Alkhayat , Salma AlHajri , Ramaswamy Narayanaswamy , Anisa Hassan , Shahena Akhter , Amal Faysal Omar , Nafisa Fadulelmula , Raghad Al-Taweel , Reema El Hassan
Biodiversity in arid regions is typically low, with limited functional redundancy, making ecosystems vulnerable to species loss. In the Arabian Peninsula, particularly in Qatar, terrestrial biodiversity data remain scarce, hampering conservation and restoration efforts. To address this gap, we conducted extensive camera trapping from 2022 to 2025 across four sites in Qatar to document terrestrial vertebrate occurrence, with an emphasis on mammals. A total of 85 camera traps were installed at various locations, remaining active in the field for over 9000 days and capturing more than 25,000 photos of wild animals, including eight mammals, 25 birds, and four reptile species. We recorded several species of global conservation concern, such as the sand cat (Felis margarita), Arabian sand gazelle (Gazella marica), Asian houbara (Chlamydotis macqueenii), European turtle dove (Streptopelia turtur), and Egyptian spiny-tailed lizard (Uromastyx aegyptia). Notably, the five-striped palm squirrel (Funambulus pennantii), an introduced species, was documented for the first time in Qatar. While camera trapping proved effective for cryptic and nocturnal species, it underrepresented small mammals and reptiles, and bird identification was limited by image quality. Despite these constraints, the study updates Qatar’s terrestrial vertebrate inventory and emphasizes the importance of expanding and integrating methods such as eDNA with camera trapping to establish a comprehensive biodiversity baseline. Domestic dogs and cats were photo-captured at different camera stations, which could be a serious threat to native wildlife. Therefore, immediate management interventions are required to control and, if necessary, remove these, particularly from protected areas.
干旱地区的生物多样性通常较低,功能冗余有限,使生态系统容易受到物种丧失的影响。在阿拉伯半岛,特别是在卡塔尔,陆地生物多样性数据仍然匮乏,阻碍了保护和恢复工作。为了解决这一差距,我们从2022年到2025年在卡塔尔的四个地点进行了广泛的摄像机捕获,以记录陆生脊椎动物的发生,重点是哺乳动物。在不同地点共设置了85个相机陷阱,在野外活动了9000多天,拍摄了2.5万多张野生动物的照片,包括8种哺乳动物、25种鸟类和4种爬行动物。我们记录了沙猫(Felis margarita)、阿拉伯沙羚(Gazella marica)、亚洲鼠原(Chlamydotis macqueenii)、欧洲斑鸠(Streptopelia turtur)和埃及棘尾蜥蜴(Uromastyx aegyptia)等全球保护物种。值得注意的是,五条纹棕榈松鼠(Funambulus pennantii)是一种引进物种,首次在卡塔尔被记录在案。虽然摄像机陷阱被证明对隐蔽和夜间活动的物种有效,但它对小型哺乳动物和爬行动物的代表性不足,而且鸟类的识别受到图像质量的限制。尽管存在这些限制,该研究更新了卡塔尔的陆生脊椎动物库存,并强调了扩展和整合eDNA与摄像机捕获等方法的重要性,以建立全面的生物多样性基线。在不同的摄像站拍摄到家狗和家猫的照片,这可能对当地野生动物构成严重威胁。因此,需要立即采取管理干预措施,控制并在必要时清除这些生物,特别是在保护区内。
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引用次数: 0
Forensic scatology: insights into the secretive Mediterranean monk seal via a comprehensive molecular analysis of aged and recent fecal samples 法医粪便学:通过对古老的和最近的粪便样本进行全面的分子分析,深入了解神秘的地中海僧海豹
IF 3.4 2区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION Pub Date : 2025-12-01 DOI: 10.1016/j.gecco.2025.e03966
Elena Valsecchi , Alessia Rota , Antonia Bruno , Emanuele Coppola
The Mediterranean monk seal (Monachus monachus), the only pinniped endemic to the Mediterranean Sea, is among the most vulnerable mammals in the Anthropocene, facing severe pressures from habitat degradation, human disturbance, and climate-driven ecosystem changes. Its elusive nature and use of inaccessible habitats complicate monitoring efforts, with most sightings remaining opportunistic and providing limited biological insight. Addressing these challenges requires innovative, non-invasive methodologies to improve conservation outcomes. Here, we assess the potential of fecal DNA analysis as a tool for monitoring and understanding this species in a rapidly changing world. Eight fecal samples, collected under varied conditions and spanning more than a decade, were examined using a suite of nine genetic assays. Analyses revealed critical biological information, including diet composition (predominantly bony fish, with cephalopod and bivalve mollusks), sex determination, and haplotype identity. Results demonstrated that even older samples preserved in ethanol retained substantial host DNA, though prey DNA degradation was more pronounced. DNA degradation in feces can affect data quality, but at the same time can provide insights into scat age and associated ecological behaviors. By integrating molecular ecology with conservation practice, this study highlights fecal DNA as a ready-to-use, non-invasive, and ethically sound approach to generate essential knowledge on diet, genetic diversity, social structure and, and health parameters (e.g., parasite load) in M. monachus. Our findings underscore the importance of applying emerging technologies to mitigate knowledge gaps and inform conservation strategies, ultimately contributing to the preservation of mammalian biodiversity under accelerating anthropogenic pressures.
地中海僧海豹(Monachus Monachus)是地中海唯一特有的鳍状动物,是人类世最脆弱的哺乳动物之一,面临着栖息地退化、人类干扰和气候驱动的生态系统变化的严重压力。其难以捉摸的性质和使用难以进入的栖息地使监测工作复杂化,大多数目击仍然是偶然的,提供有限的生物学见解。应对这些挑战需要创新的、非侵入性的方法来改善保护成果。在这里,我们评估粪便DNA分析作为监测和了解这个物种在快速变化的世界的工具的潜力。研究人员在不同条件下收集了8份粪便样本,时间跨度超过10年,使用了一套9种基因分析方法。分析揭示了关键的生物学信息,包括饮食组成(主要是硬骨鱼,有头足类和双壳类软体动物)、性别决定和单倍型身份。结果表明,即使是保存在乙醇中的较老的样本也保留了大量的宿主DNA,尽管猎物DNA的降解更为明显。粪便中的DNA降解会影响数据质量,但同时可以提供对粪便年龄和相关生态行为的见解。通过将分子生态学与保护实践相结合,本研究强调粪便DNA是一种现成的、非侵入性的、合乎伦理的方法,可以获得关于单爪猴饮食、遗传多样性、社会结构和健康参数(例如寄生虫负荷)的基本知识。我们的研究结果强调了应用新兴技术来缓解知识差距和为保护策略提供信息的重要性,最终有助于在加速的人为压力下保护哺乳动物的生物多样性。
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引用次数: 0
Status and social structure of the critically endangered dama gazelle (Nanger dama) in the Aïr & Ténéré National Nature Reserve, Niger 尼日尔Aïr & tsamnassir国家自然保护区极度濒危的大羚羊(Nanger dama)的地位和社会结构
IF 3.4 2区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION Pub Date : 2025-12-01 DOI: 10.1016/j.gecco.2025.e03976
Abdoul Razack Moussa Zabeirou , Thomas Rabeil , Violeta Barrios , Tim Wacher , John Newby , David Mallon , Pavla Hejcmanová , Karolína Brandlová
The dama gazelle (Nanger dama (Pallas, 1766)) is one of the largest of all gazelles, and also one of the world’s most endangered antelopes listed as Critically Endangered on the IUCN Red List. Today, only a few small and highly scattered populations persist, mainly in Niger and Chad. This study provides recent insights into the population status, structure, and phenotypic diversity of dama gazelles in the Aïr & Ténéré National Nature Reserve (ATNNR), focusing on the Mount Takolokouzet, and based on 15 field missions conducted between 2017 and 2023. Distribution and relative abundance were assessed using direct observations, indirect signs, and camera traps. The Kilometric Index of Abundance (KIA) averaged 0.058 for direct observations and 0.16 for indirect observations, showing a positive trend over time, particularly for indirect evidence. Camera trap data revealed an overall capture rate (CTR) of 1.59 independent events per 100 trap-days, with increased detection during recent targeted efforts. Demographic analysis was based on 39 direct sightings (84 individuals) and 200 independent camera trap events (244 individuals). Solitary individuals were primarily adults, representing 83 % of camera trap records and less than half of direct sightings. Group sizes were from 2 to 7 (direct) and 2–4 (camera traps), with an overall mean of 2.95 individuals. Adults were dominant in both datasets, while juveniles and subadults comprised less than 20 % of individuals. Calving was observed in two distinct seasonal periods. Phenotypic diversity in the dama gazelle population at ATNNR was marked by traits associated with different coat patterns. The N. d. dama phenotype was the most common (73 %), with smaller proportions exhibiting distinct variations (18 % and 9 %). This suggests a phenotypically mixed population, but caution is needed as subspecies differentiation remains debated. The variation may represent a spectrum rather than distinct subspecies. Our results highlight the importance and fragility of a small, little-known population of dama gazelle on Mount Takolokouzet. The consistently low proportion of young individuals highlights concerns about recruitment. Our findings justify urgent conservation measures focused on securing refuges, reducing disturbance, sustaining monitoring, and protecting breeding females during calving peaks, while ecological drivers will be examined in future work.
大羚羊(Nanger dama (Pallas, 1766))是所有瞪羚中最大的一种,也是世界上最濒危的羚羊之一,被世界自然保护联盟列为极度濒危物种红色名录。今天,只有少数少数高度分散的种群仍然存在,主要在尼日尔和乍得。本研究基于2017年至2023年期间进行的15次实地考察,对Aïr &; ttamn国家自然保护区(ATNNR)的大瞪羚的种群状况、结构和表型多样性进行了深入研究。分布和相对丰度评估采用直接观察,间接标志和相机陷阱。直接观测的公里丰度指数(KIA)平均为0.058,间接观测为0.16,随着时间的推移呈现正趋势,特别是间接证据。相机陷阱数据显示,每100个陷阱日的总捕获率(CTR)为1.59个独立事件,在最近的目标工作中,检测率有所增加。人口统计学分析基于39个直接目击事件(84个个体)和200个独立相机陷阱事件(244个个体)。单独的个体主要是成年个体,占相机捕捉记录的83% %,不到一半的直接目击。群数为2 ~ 7只(直接)和2 ~ 4只(诱捕器),平均2.95只。在两个数据集中,成虫都占主导地位,而幼虫和亚成虫占个体的比例不到20% %。在两个不同的季节观察到产犊。ATNNR大瞪羚种群的表型多样性表现为与不同被毛图案相关的性状。N. d. dama表型是最常见的(73% %),较小比例表现出明显的变异(18% %和9 %)。这表明一个表型混合的种群,但需要谨慎,因为亚种分化仍然存在争议。这种变异可能代表一个谱,而不是不同的亚种。我们的研究结果突出了Takolokouzet山上一个鲜为人知的小羚羊种群的重要性和脆弱性。年轻人的比例持续偏低凸显了招聘方面的担忧。我们的研究结果表明,迫切需要采取保护措施,重点是确保避难所,减少干扰,持续监测,并在产犊高峰期保护繁殖雌性,而生态驱动因素将在未来的工作中进行研究。
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Global Ecology and Conservation
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