Migration patterns and habitat use of the tapertail anchovy Coilia mystus in the Oujiang River Estuary and the Zhujiang River Estuary, China

Habitat use of the tapertail anchovy(Coilia mystus Linnaeus, 1758) from the Oujiang River Estuary and the Zhujiang(Pearl) River Estuary was studied by examining the environmental signatures of Sr and Ca in otoliths using electron probe microanalysis. Individuals from the Oujiang River had higher and varied Sr:Ca ratios(expressed as(Sr:Ca)×1 000, 3.83–13.0 average) in the otolith core regions, suggesting that they were born in brackish or sea waters, and that a freshwater habitat might not be necessary for egg hatching and larval growth.While, individuals from the Zhujiang River had lower Sr:Ca ratios(0.39–2.51 average) in the core regions,suggesting a freshwater origin. After hatching, anchovies from the Zhujiang River migrate downstream to the river estuary close to brackish water. Our results demonstrated varied habitat use for spawning during stages of early life history between the two populations, and suggested that such variations are promoting diversity of life history strategies of this species.

Unravelling habitat use of Coilia nasus from the Rokkaku River and Chikugo River estuaries of Japan by otolith strontium and calcium

The migratory history of the engraulid fish Coilia nasus in the Rokkaku and Chikugo River estuaries of the Ariake Sea, Japan was assessed using otolith strontium（Sr） X-ray intensity maps and strontium：calcium（Sr：Ca） ratio life history transects by an electron probe microanalyzer（EPMA）. The results showed that seven of the ten specimens from the Rokkaku River Estuary（LJC） and all 15 specimens collected in the Chikugo River Estuary（ZHC） had low Sr：Ca ratios（≤3） at the central otolith area, indicating their riverine origin and initial freshwater residence. After the first regime shift adjacent to natal regions, the Sr level mapping displayed a wide variety of color patterns, and the Sr：Ca ratios obtained by the line transect analysis could be divided into one to six significantly different phases indicative of gradual life history transition. The other three specimens from the Rokkaku River Estuary had high Sr：Ca ratios（3–6.7） at the central otolith area but showed alternating changes between low and high values outside the natal region, suggesting that estuarine-origin individuals occurred in the Rokkaku River Estuary. The two-dimensional maps of the Sr level and average of the otolith Sr：Ca ratios along the life-history transects could be used as effective tools for reconstruction of past habitat use of the tapertail anchovy in estuaries of the Ariake Sea, Japan.

Assessing the benthic habitat quality in the Huanghe(Yellow River) Estuary and its adjacent areas using AMBI and M-AMBI

The protection of the biological diversity and the maintenance of the regional ecological integrity for the Huanghe （Yellow River） Estuary and its adjacent areas are practically significant and valuable. However, frequent human activities and natural climate changes have caused vigorous disturbances on the ecosystem in these sea areas. An objective assessment on the benthic habitat quality （BHQ） of the Huanghe Estuary and its adjacent areas is conducted, using AZTI＇s Marine Biotic Index （AMBI） and multivariate AMBI （M-AMBI） based on the data of macrobenthos in May and August 2011. The results show that both the indices do not correlate significantly, and their assessment results are greatly different. All of the samples assessed using the AMBI were ＂high＂ or ＂good＂, because the ecological group I （EGI） and the ecological group II （EGII） were dominant macrobenthic ecological groups in the research area. Owing to a low species＇ richness and a high individual abundance in some samples, the BHQ levels using the M-AMBI were worse than those of the AMBI. Significant correlations are observed between the M-AMBI, water depth, bottom water salinity and dissolved inorganic nitrogen, thus the M-AMBI could sensitively respond to environmental changes and distinguish influences from uninfluenced stations, but the AMBI could not. The consistent results between the AMBI and the M-AMBI mainly appeared in the uninfluenced （undisturbed or slightly disturbed） sta- tions. Therefore, the M-AMBI is more effective than the AMBI in assessing the benthic habitat quality in the Huanghe Estuary and its adjacent areas. Using the M-AMBI to assess the BHQ of the Huanghe Estuary and its adjacent areas, the results show that 3% of the stations are undisturbed and the BHQs are ＂high＂, and 61% of the stations are slightly disturbed and those of the BHQ are ＂good＂, and the rest are meanly disturbed and those of the BHQ are ＂moderate＂.

基于River 2D模型的黄河花园口河段生态流量研究

针对目前生态流量研究方法难以充分考虑鱼类栖息地等生境因素的问题,以黄河花园口鲤鱼核心保护区为研究区域,选取黄河鲤鱼为研究物种,基于耦合水动力学模型和栖息地模型的River 2D模型确定黄河鲤鱼的生态流量,将水深和流速作为鱼类生存保护的限定性因子,采用栖息地模型模拟不同流量下对应的黄河鲤鱼的适宜栖息地面积。计算结果表明:花园口河段鲤鱼产卵期的最小生态流量为230 m^(3)/s,生长期的最小生态流量为430 m^(3)/s,越冬期的最小生态流量为150 m^(3)/s。计算结果可以为花园口核心鱼类保护区的鱼类保护以及黄河小浪底水库的生态调度提供参考。

Pre- and Post-Construction Assessment of Nutrient Concentrations at Shallow Water Habitat Restoration Sites on the Lower Missouri River

Loss of shallow water habitat (SWH) is hypothesized as a factor contributing to the decline of native Missouri River fishes, including the endangered pallid sturgeon. As a result, the restoration of SWH is a high priority in this large river system. Restoration activities often include constructing side channel chutes;however, limited information exists on the potential negative, unintended effects of chute construction activities on water quality. This study was designed to better understand the possible effects of chute construction, both initially and as chute development continues, on Missouri River nutrient concentrations. Our first objective was to determine if the addition of sediment from proposed chute locations to river water samples (i.e., elutriate samples) increased nutrient concentrations relative to water-only river samples collected just upstream of the proposed chute locations or river water samples collected from eight long-term water quality monitoring stations. Our second objective was to determine if nutrient concentrations of river samples monitored during 2009 and 2010 increased after water passed through previously-constructed chutes. Nutrient concentrations of elutriate samples were not significantly higher than river water samples collected just upstream of the proposed chute locations;the same was true for Missouri River water samples collected from seven of eight long-term water quality monitoring stations. Furthermore, monitoring of nutrient concentrations collected from water samples at the outlet of previously-constructed chutes were not significantly higher than water samples collected at the upstream inlet of these chutes. Our results suggest that individual SWH chute construction projects designed to restore some of the natural form and function of the Missouri River are unlikely to significantly increase Missouri Rivernutrient concentrations initially or as these chutes continue to develop.

Population dynamics and habitat use of the Black-necked Crane (Grus nigricollis) in the Yarlung Tsangpo River basin, Tibet, China

Background:The Black-necked Crane (Grus nigricollis)is an internationally threatened crane living on the plateau, mainly in winter, in the Yarlung Tsangpo River basin in Tibet,western China. In the past five years,some economic development projects have been conducted in this area,posing potential threats to the wintering populations of the cranes and their habitats. Therefore, the current population dynamics of wintering Black-necked Cranes and habitat suitability in the Yarlung Tsangpo River basin were investigated. Methods: Twenty counties were surveyed using the line transect method in December 2017 and January 2018, and we recorded the location,flock size,number of individuals,habitat types and presence of human disturbance in which they occurred.We compared the results from the middle wintering period in this survey with those from 2014. Results: The highest number of cranes recorded was 8291,and the results showed that the cranes were mainly distributed in Lhaze, Namling, Samzhubze, and Lhunzub.A total of 577 and 495 flocks were recorded in the early and middle wintering periods, respectively. In the early wintering period,there were signi ficant differences in the number of individuals across the di fferent habitats,with crop stubble land and plowed land representing more than 30% of the total habitat utilization.In the middle wintering period, there were also signi ficant differences in the number of individuals, and the utilization of crop stubble land represented over 60% of the total. Conclusions: Wintering Black-necked Cranes mainly fed on spilled grains in stubble habitat after harvest. In the middle wintering period, some of the farmlands were plowed and irrigated,which resulted in food shortages in these areas,and the cranes tended to gather in mixed flocks of large size instead of as a single family.There were still considerable regional wintering populations decreases in Quxu,Nedong,and Sakya in 2018 compared with 2014,and these decreases were mainly due to some recently emerging threats,including farmlands being converted into areas of greenhouse cultivation,highway and railway construction, river dredging,the rapid development of the manufacturing and mining industries,and the lack of protection of important wintering sites.

Integrated assessment of river health based on water quality, aquatic life and physical habitat

The health conditions of Liao River were assessed using 25 sampling sites in April 2005, with water quality index, biotic index and physical habitat quality index. Based on the method of cluster analysis （CA） for water quality indices, it revealed that heavily polluted sites of Liao River are located at estuary and mainstream. The aquatic species surveyed were attached algae and benthic invertebrates. The result showed that the diversity and biomass of attached algae and benthic index of biotic integrity （B-IBI） were degrading as the chemical and physical quality of water bodies deteriorating. Physiochemical parameters, BODs, CODcr, TN, TP, NH3-N, DO, petroleum hydrocarbon and conductivity, were statistically analyzed with principal component analysis and correlation analysis. The statistical results were incorporated into the integrated assessing water quality index, combining fecal coliform count, attached algae diversity, B-IBI and physical habitat quality score. A comprehensive integrated assessing system of fiver ecological health was established. Based on the systimetic assessment, the assessed sites are categorized into 9 ＂healthy＂ and ＂sub-healthy＂ sites and 8 ＂sub-sick＂ and ＂sick＂ sites.

基于景观格局的玛纳斯河流域生境质量及生态风险研究

[目的]综合分析评价玛纳斯河流域绿洲生境质量并甄别诱因,为流域生境改善及区域可持续发展提供参考。[方法]以玛纳斯河流域2020年高分辨率遥感影像数据为基础,结合景观生态学方法,应用InVEST模型和景观生态风险评价模型对玛纳斯河流域生境质量和景观生态风险进行综合评价。[结果]2020年玛纳斯河流域生境质量均值为0.33,整体生境质量较差,防护林的较高退化风险和耕地的广泛分布是区域生境质量较差的主要诱因,高生境质量地类如湿地、水域等面临较高的退化风险。流域内防护林闭合程度低和林网结构不合理等导致其景观破碎化最为严重,湿地和水域景观干扰度较高,受人为影响较深。流域内较高生态风险区占比最大,达到37.82%,其与高生态风险区的总和占比超过70%,整体呈现出中部高、边缘低的层叠状分布特征。生境质量与景观生态风险二者存在较强的空间集聚效应,以高-高聚集和低-低聚集为主。[结论]景观格局的分布对区域生境质量和景观生态风险影响较大,未来需要重点针对流域内耕地的合理规划利用、防护林维护与建设的进一步加强以使其充分发挥效用、湿地与水域等的切实保护,以提高玛纳斯河流域生境质量和降低景观生态风险。

长江干流黄冈段鸟类资源调查与多样性分析

为研究长江干流黄冈段的鸟类资源和多样性,本文于2021−2022年对黄冈市沿江的6个县(市、区)进行鸟类监测和多样性分析。结果表明:①长江干流黄冈段共记录到15目47科131种鸟类,其中,雀形目最多,共有79种;国家重点保护鸟类17种;世界自然保护联盟(IUCN)评定为易危(VU)等级的物种4种。按居留类型分类,留鸟最多,共有55种;按地理分布划分,古北种52种、东洋种58种、广布种21种。②从生境斑块类型来看,鸟类物种丰富度表现为农田>林地>建筑用地>山涧溪流>湖泊河流。③从多样性指数来看,ACE指数显示,鸟类物种丰富度表现为蕲春县>武穴市>浠水县>黄梅县>团风县>黄州区;Shannon-Wiener指数显示,鸟类物种丰富度表现为团风县>浠水县>蕲春县>武穴市>黄梅县>黄州区,偶见鸟类对Alpha多样性有显著影响。④采用Bray-Curtis转换后的主坐标分析显示,前两个主成分共同解释了65.2%的方差,表明鸟类分布具有地域特性。⑤基于Bray-Curtis距离的聚类分析显示,浠水县、蕲春县和武穴市的物种分布相似度较高,团风县与浠水县相似度也较高,而黄梅县和黄州区与其他4个县市的物种分布相似性较低。研究显示,长江干流黄冈段的鸟类资源相对丰富,不同县(市、区)间的鸟类组成存在空间差异,这反映了鸟类多样性的空间独立性特征,本研究对于该地区的鸟类资源评估和保护具有重要意义。

北京温榆河公园鸟类多样性特征与生境优化策略

北京温榆河公园位于北京市第二道绿化隔离地区,是依托北京温榆河−北运河生态廊道建设而成的超大城市级绿色空间,研究其鸟类多样性特征,优化其生境质量对维持北京地区的生物多样性具有重要意义。根据北京温榆河公园2022年1月−2023年12月的鸟类多样性调查数据,详细识别公园内鸟类的群落结构并划分不同的鸟类取食集团,分析不同季节的鸟类多样性时空特征与多样性热点区域;根据遥感解译与植被多样性调查结果对研究区域的生境类型进行划分,针对具有不同鸟类群落特征的生境类型提出具体的优化方案。结果表明:①在北京温榆河公园共调查到鸟类174种,隶属于19目51科,其中,有国家Ⅰ级重点保护物种4种,国家Ⅱ级重点保护物种21种。②北京温榆河公园鸟类的α-多样性在春季最高,温榆河主河道具有最高的鸟类多度和多样性指数。③北京温榆河公园可划分为生境类型Ⅰ(滨水湿地+乔灌林地)、生境类型Ⅱ(密林地)、生境类型Ⅲ(滨水湿地+疏林地)3种生境组合。根据不同生境中的鸟类群落特征差异有针对性地提出生境优化策略,建议生境类型Ⅰ在维护湿地生境的同时提高陆生鸟类栖息地的质量;生境类型Ⅱ增加常绿树种、小乔木、食源灌木和乡土草本植物的种植密度,减少对地被植物的收割干扰与枯落物清除,提高微景观异质性;生境类型Ⅲ增加配置具有速生特性的鸟类食源树种,适度提高乔灌层的高度、盖度和丰富度。

Fish Assemblage Responses to a Low-head Dam Removal in the Lancang River

Dam removal is becoming an effective approach for aquatic biodiversity restoration in damming river in order to balance the aquatic ecosystem conservation with large-scale cascade damming. However, the effects of dam removal on fish communities in Asian mountainous rivers, which are dominated by Cypriniformes fishes, are still not well known. To determine whether dam removal on a mountainous river benefit restoration of fish diversity, we investigated the response of fish assemblage to dam removal using a before-after-control-impact design in two tributaries of the Lancang River(dam removal river: the Jidu River, and control river: the Fengdian River). Fish surveys were conducted one year prior to dam removal(2012) and three years(2013–2015) following dam removal. We observed rapidly and notably spatio-temporal changes in fish biodiversity metrics and assemblage structure, occurring in the Jidu River within the first year after dam removal. Overall, fish species richness, density and Shannon-Wiener diversity all increased immediately in above-and below-dam sites, and maintained a stable level in subsequent years, compared to unchanged situation in the control river. All sites in the Jidu River experienced shifts in fish composition after dam removal, with the greatest temporal changes occurred in sites below-and above-the former dam, resulting in a temporal homogenization tendency in the dam removed river. These findings suggest that dam removal can benefit the recovery of habitat conditions and fish community in Asian mountainous rivers, but the results should be further evaluated when apply to other dammed rivers since the dam age, fluvial geomorphology and situation of source populations could all affect the responses of fish assemblages.

Coupling interaction between biodiversity and aquatic habitat area in Western Route Project vicinity

The Western Route of the South-to-North Water Transfer Project will divert water from the upper Yangtze River and its tributaries, the Dadu River and Yalong River, to the upper Yellow River. The project may ease the water shortage in the Yellow River Basin. However, it may also have some effects on the ecosystem in the upper Yangtze River Basin. Benthic invertebrates play an important role in the river ecosystem, particularly in the circulation of materials and nutrition. Benthic invertebrates are widely used to quickly assess river ecosystems because of their rapid response to changes in the water environment. The diversity of benthic invertebrates is closely associated with the aquatic habitat area. This study examined this interaction by sampling the benthic invertebrates in an expanding area. The conclusions are that the diversity of benthic invertebrates begins to decrease when the aquatic habitat area is reduced to 45% of the original area, and decreases dramatically when the aquatic habitat area is reduced to 10% of the original area. The aquatic habitat area should be kept at more than 45% of the original area in order to maintain the significant diversity of benthic invertebrates.

黄河流域特色保护类村庄种群分布动态与生境选择

基于种群生态学理论,将黄河流域971个国家级特色保护类村庄视作一个地理种群。综合GIS空间分析和数理统计方法,明晰这一种群的分布动态和生境选择特征,进而应用地理探测器对比揭示影响该种群分布的生态因子。结果表明:(1)黄河流域特色保护类村庄的分布密度随种群增长而大幅提高,分布模式随尺度变大由显著聚集转为不显著离散,分布格局随时间推移由多中心向单中心演化,但集聚中心一直位于河谷盆地;(2)黄河流域特色保护类村庄具有“聚中低山区、向阳坡斜坡、喜温暖湿润、近黄河干流”的偏好,趋向中等人口密度、经济欠发达地区分布,主要位于国道沿线30 km、省道沿线10 km、中心城市周边20~80 km、历史城镇周边60 km、旅游景区和文保单位周边20 km范围内;(3)影响特色保护类村庄种群分布的生态因子具有综合性、非等价性和限定性,在黄河流域以文保单位和海拔为主导。

Orange River Francolins(Scleroptila levaillantoides)persist in fragmented Highveld farming landscapes,South Africa

Background:How do Orange River Francolins(Scleroptila levaillantoides) adapt to an intensive farming landscape with grass(grazing) camps and crop cultivation? To answer this question, a study was carried out in south-east of Johannesburg in South Africa to clarify the interaction of francolins with a landscape consisting of land use mosaics.Methods:A transect-road of 45 km was traversed weekly during November 2015–October 2016 through flat maize(Zea mays) and cattle(Bos primigenius) grazing fields. Francolins were counted in three land use mosaic types along the transect-road(including the road):grass camps on both sides of the road(grass/grass edges); arable fields on both sides(arable/arable edges) and arable land on one side with grass camps on the opposite side of the road(arable/grass edges).Results:Francolins used all three mosaic types, but the arable/arable edges were least frequented. Nonetheless, the arable/arable edges played an important part:francolins, including females with chicks, moved along the arable/arable edges, which enabled contact between sub-populations, and the arable/arable edges provided temporary cover(e.g. stubble and maize plants) and ploughed firebreaks to forage(e.g. for bulbs).Conclusion:Cultivation of crop within grasslands does not constrain breeding, movement and habitat use by the Orange River Francolin. For conservation purposes it is critical that the fine-scale mosaic of grazing and cultivation areas remain intact.

融合鱼类生境及航运的河流多目标生态流量研究

维持河流生态流量是保障水生态系统健康的基本要求,鱼类是水生态系统生物群落中的顶级物种。基于水生态调查,以生境模拟法为基础探究山东省小清河干流的生态流量。利用相对重要性指数选取不同季节的鱼类指示物种,结合生境调查和相关文献绘制鱼类生境适宜性曲线,利用生境模拟法求解黄台桥、岔河和石村水文站3个生态流量控制断面满足鱼类生境适宜性要求的生态流量;通过计算生态流量保证率对水文学方法和生境模拟法计算的生态流量进行比选,并结合小清河航运要求,确定小清河干流满足鱼类生境适宜性、水文节律性和航运要求的多目标生态流量。通过与3个控制断面长系列实测月平均流量比较求得多目标生态流量年平均保证率分别为98.21%、83.77%和80.13%,而岔河水文站6月份、石村水文站4、5月份保证率明显低于平均水平,需予以重点关注。

三峡水库下游宜昌-城陵矶河段地形多样性变化评价及其成因分析

河道地形的多样性决定了河流栖息地物理生境的多样性,对水生生物物种丰度、多样性程度有重要影响。三峡水库蓄水后,下游河道河床发生显著冲淤调整,河道地形多样性也随之变化。使用2003、2018年长江三峡水库下游宜昌-城陵矶河段固定断面实测地形数据,基于河道纵向多样性、横向多样性、水深方向生境完整性指标,构建多样性综合指标,分析三峡水库蓄水后不同河型、不同河段栖息地地形多样性变化差异性及成因。结果表明:不同河型地形多样性不同,不同河段地形多样性也相应的存在差异,弯曲河型峰度系数低,低滩占比大,多样性高于其他河型,由弯曲河型为主构成的下荆江河段多样性也最高。水库蓄水后,下游河段地形多样性总体降低,但不同河型、不同河段地形多样性变化不同:顺直河型平滩水位、枯水位下峰度系数均增加,分汊河型枯水位峰度系数整体增加,而弯曲河型平滩水位下峰度系数减小,以弯曲河型为主的下荆江河段峰度系数减小。蓄水后不同河型冲淤调整的差异性是导致多样性变化趋势不同的内在机制。研究成果可为认识人类活动影响下河流栖息地变化提供支持。

基于土地利用变化的湖南长江岸线生境质量评价

岸线是长江湿地生态系统的重要组成部分,研究其土地利用变化及其生境质量时空响应对长江岸线生态保护和土地资源可持续利用具有重要意义。本文以1990、2000、2010、2020年4期土地利用数据为基础,采用生态系统服务和权衡的综合评估(integrated valuation of ecosystem services and tradeoffs,InVEST)模型,研究了湖南长江岸线30年来土地利用变化及生境质量时空演变特征。结果表明:(1)1990—2020年湖南长江岸线土地利用格局发生了明显变化,草地、建设用地、未利用土地面积持续增加,占比分别增加了3.69%、0.81%和0.56%,耕地和水域面积持续减小,占比分别降低了2.46%和1.88%。(2)1990—2020年湖南长江岸线生境质量均值为0.8075,其中1990—2010年生境质量呈下降趋势,2010年后生境质量明显提高。生境质量空间分布表现为长江干线到防洪大堤逐渐降低。(3)生境质量等级以“优”和“良好”为主。相较于1990年,2020年生境质量“优”等级和“良好”等级面积占比共减少了0.25%。(4)土地利用转化产生的负面影响大于正面影响,土地利用转化导致生态环境退化和改善的土地利用变化贡献指数(land use change contribution index,CI)分别为-1.8151和0.9569,其中草地、水域转为耕地和建设用地是造成研究区生境质量下降的主要原因。该研究有助于进一步了解长江岸线土地利用变化与生境质量之间的关系,可为长江经济带生态保护和可持续发展提供科学支撑。

三峡水库蓄水后长江中下游典型物理生境变化及其影响

三峡水库蓄水后,长江中下游物理生境发生明显变化,一定程度上影响河流功能的发挥。采用资料分析和文献综述,研究了三峡水库蓄水运用后长江中下游水文条件、河道形态、植被等典型物理生境的变化,总结了其对防洪、航道条件、供水、典型水生生物的影响。提出了应加强研究内容:①监测方面,包括长江中下游系统性和长期性监测、河(航)道治理工程、生态调度试验效果监测等。②规律和机理方面,包括河道形态变化机制和共性规律、干流洲滩植被变化机制、长江中下游洪水位和底栖动物对物理生境变化的响应规律和阈值等。③方法和对策方面,包括多因素影响下长江中下游水文条件中长期变化趋势预测方法,适应物理生境变化并满足需求的整治技术,满足供水、底栖、鱼类繁殖等目标的水库优化调度方案等,物理生境变化-影响效应-改善策略和技术全过程一体化研究。研究成果可为长江大保护及其健康发展提供参考。

Seed dispersal by Tana River mangabeys in fragmented gallery forests

Data collected on a free ranging group of Tana River mangabeys (Cercocebus galeritus) indicates that this endangered primate species, which has previously been regarded as a seed predator, plays an important role in seed dispersal and do contribute to the regeneration of a highly fragmented gallery forest. We observed fruit handling behavior and the post-dispersal fate of seeds ingested by the mangabeys. The two main fruit handling behaviors observed, fruit swallowing and processing fruits in cheek pouches, positively contributed to seed disper- sal. Seed predation was not common during this study, apart from a few particular plant species such as Acacia robusta and Alangium salviifolium with non-fleshy fruits. We found a correlation between seed predation and fruit availability, respectively seasonal differential specific dispersal efficiency. The role of the mangabeys in dispersing seeds and facilitating forest regeneration is enhanced by their movement across forest patches through non-forested matrix, which contributes to the deposition of seeds and regeneration in these habitat gaps.

基于卫星跟踪的黄河三角洲东方白鹳适宜栖息地分布预测

【目的】根据黄河三角洲东方白鹳卫星跟踪位点,预测其在全国范围内夏季和冬季适宜栖息地分布,以期为东方白鹳的协同保护提供科学依据。【方法】利用2016—2022年山东黄河三角洲80只东方白鹳卫星跟踪数据,通过空间自相关分析筛选出夏季5283个点位,冬季4730个点位,使用最大熵模型(MaxEnt)预测黄河三角洲东方白鹳夏季与冬季潜在适宜栖息地分布,并划分适宜等级。【结果】1)MaxEnt模型预测夏季和冬季AUC值分别为0.866和0.838,结果准确性好。2)海拔、等温性、距河湖距离、平均气温日较差、降水量季节性以及土地利用类型是影响黄河三角洲东方白鹳夏季与冬季分布的关键环境因素。3)黄河三角洲东方白鹳夏季栖息地高适宜区面积为14.75×10^(4)km^(2)(占适宜区总面积的13.01%),主要位于松嫩平原(57.52%)、渤海湾(17.56%)、辽河平原(14.94%)等地区;栖息地类型包括湿地(35.30%)、农田(33.74%)和水域(12.43%)等。4)冬季栖息地高适宜区面积为11.63×10^(4)km^(2)(占适宜区总面积的11.62%),主要位于长江中下游平原(49.02%)、淮河流域江苏洪泽湖(23.75%)、渤海湾(11.52%)等地区;栖息地类型主要包括湿地(40.56%)、农田(29.68%)和水域(18.45%)等。(5)夏季与冬季栖息地高适宜区的重叠面积为2.13×10^(4)km^(2)(占总重叠面积的4.11%),主要分布在渤海湾(59.81%)、山东半岛沿海(23.24%)、江苏东部沿海(9.34%)等区域。【结论】夏季适宜栖息地向北扩到东北松嫩平原、三江平原和辽河平原,该结果打破了东方白鹳出生后扩散的传统认知,建议加强该物种的协同保护。