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Nutrient Peak Shifts in the Arctic: Implications for Migratory Herbivores Under Climate Change 北极的营养峰值变化:气候变化对迁徙食草动物的影响
IF 3.6 2区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2026-02-14 DOI: 10.1111/jbi.70168
Nomikos Skyllas, Juul Limpens, Thomas K. Lameris, Bart A. Nolet, Richard Bintanja
<div> <section> <h3> Aim</h3> <p>Quantifying how the timing and spatial variability of Arctic vegetation nutrient peaks are projected to shift under climate change, and assessing potential consequences for migratory herbivores that rely on seasonal synchrony with peak plant quality.</p> </section> <section> <h3> Location</h3> <p>Circumpolar Arctic, with emphasis on tundra regions.</p> </section> <section> <h3> Time Period</h3> <p>Projections to the end of the 21st century, under SSP2-4.5 and SSP5-8.5 climate scenarios.</p> </section> <section> <h3> Major Taxa Studied</h3> <p>Migratory herbivores. As a case study, we use long-distance migratory herbivorous birds to represent species reliant on synchrony with Arctic vegetation phenology and to illustrate differences in timing flexibility.</p> </section> <section> <h3> Methods</h3> <p>We developed a novel method to convert Leaf Area Index (LAI) outputs from Earth System Models (ESMs) into Normalised Difference Vegetation Index (NDVI), allowing estimation of the day of year when vegetation reaches peak quality (the nutrient peak). We then used this method across multiple CMIP6 models and climate scenarios to map projected changes in timing and variability of nutrient peaks. These projections were compared to observed timing flexibility in bird migration.</p> </section> <section> <h3> Results</h3> <p>Nutrient peaks are projected to advance across most of the Arctic, with the strongest shifts in Europe–western Russia, where tundra regions may experience advances of up to 19.1 days by 2100. These advances are accompanied by increased spatial heterogeneity and interannual variability. Comparing projections to data on migratory timing of long-distance migratory birds suggests that several species may already experience a mismatch between migration timing and timing of nutrient peaks by mid-century. Under SSP5-8.5, nearly all years are likely to show timing mismatches by century's end, even for species with broader behavioural flexibility.</p> </section> <section> <h3> Main Conclusions</h3> <p>Climate-driven shifts in Arctic vegetation phenology are expected to increasingly disrupt the match between peak plant quality and migratory herbivores' resource demand. As mean conditions move beyond historical variab
目的量化气候变化下北极植被营养峰值的时间和空间变化,并评估依赖于植物质量峰值的季节性同步的迁徙食草动物的潜在后果。位置环极地北极,重点是苔原地区。在SSP2-4.5和SSP5-8.5气候情景下到21世纪末的预估。迁徙食草动物的主要分类群。作为一个案例研究,我们使用长途迁徙的食草鸟类来代表依赖于北极植被物候同步性的物种,并说明时间灵活性的差异。我们开发了一种新的方法,将地球系统模型(ESMs)的叶面积指数(LAI)输出转换为归一化植被指数(NDVI),从而可以估计植被质量达到峰值(营养峰值)的日期。然后,我们在多个CMIP6模型和气候情景中使用该方法来绘制营养峰值的时间和变异的预测变化。这些预测与观察到的鸟类迁徙时间灵活性进行了比较。结果:营养峰值预计将在北极大部分地区推进,其中欧洲-俄罗斯西部的变化最强烈,到2100年,苔原地区可能会提前19.1天。这些进展伴随着空间异质性和年际变率的增加。将预测结果与长途候鸟迁徙时间的数据进行比较表明,到本世纪中叶,一些物种可能已经经历了迁徙时间和营养峰值时间之间的不匹配。在SSP5-8.5的情况下,到本世纪末,几乎所有年份都可能出现时间不匹配,即使对行为灵活性更大的物种也是如此。气候驱动的北极植被物候变化将越来越多地破坏植物质量峰值与迁徙食草动物资源需求之间的匹配。随着平均条件超越历史可变性,极端年份变得更加频繁,迁徙物种可能需要在时间或路线上经历重大转变,以与快速变化的北极保持同步。
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引用次数: 0
Biogeographic Patterns and Drivers of Endolithic Symbiosis in Mussels Across Atlantic Europe and North Africa 大西洋、欧洲和北非贻贝内生共生的生物地理模式和驱动因素
IF 3.6 2区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2026-02-13 DOI: 10.1111/jbi.70174
Jonathan R. Monsinjon, Gerardo I. Zardi, Katy R. Nicastro
<div> <section> <h3> Aim</h3> <p>Ecological interactions are central to ecosystem health. In intertidal habitats, mussels serve as foundational bioengineers. Microbial endoliths erode mussel shells and impair fitness but may also provide thermal benefits under stress. This relationship can be context-dependent, shifting from parasitism to mutualism. Yet, environmental drivers and large-scale patterns of this symbiosis remain poorly understood. We aim to investigate the prevalence, severity, spatiotemporal dynamics and environmental drivers of endolithic symbiosis in intertidal mussels.</p> </section> <section> <h3> Location</h3> <p>Atlantic coasts of Western Europe and North Africa (2011–2024).</p> </section> <section> <h3> Taxon</h3> <p><i>Mytilus</i> spp.</p> </section> <section> <h3> Methods</h3> <p>Using a Random Forest machine-learning framework, we assess endolithic symbiosis across mussel size classes and evaluate 10 environmental variables for their potential roles in mediating spatiotemporal patterns: eight dynamic (e.g., solar radiation, chlorophyll-a concentration, air temperature) and two static (tidal range, proximity to sandy beaches). With this approach, we identify key predictors and develop two models of endolithic colonisation probability: a parsimonious model with minimal but highly informative predictors, and an inclusive model incorporating a broader set of relevant variables.</p> </section> <section> <h3> Results</h3> <p>Solar radiation and chlorophyll-a concentration emerged as the strongest predictors, especially for small and medium mussels. Model predictions reveal distinct seasonal and latitudinal patterns of endolithic infestation: low probabilities between 45° N and 55° N from July to October (summer to early autumn); low probabilities between 30° N and 45° N from March to May (late winter to early spring); and high probabilities between 20° N and 30° N from July to January (summer to early winter).</p> </section> <section> <h3> Main Conclusions</h3> <p>Our findings highlight the complex, dynamic nature of mussel–endolith interactions and the critical role of environmental context in shaping symbiosis. Long-term spatiotemporal predictions reveal clear seasonal bioerosion probability and underscore the need to monitor mussel beds under climate change. These findings contribute to a broader understanding of mussel–endolit
目的生态相互作用是生态系统健康的核心。在潮间带栖息地,贻贝是基础生物工程师。微生物内石侵蚀贻贝壳,损害其适应性,但也可能在压力下提供热效益。这种关系可以是情境依赖的,从寄生到互惠。然而,这种共生关系的环境驱动因素和大规模模式仍然知之甚少。研究潮间带贻贝内生共生的普遍性、严重程度、时空动态和环境驱动因素。西欧和北非大西洋海岸(2011-2024)。使用随机森林机器学习框架,我们评估了不同贻贝大小类别的内生共生关系,并评估了10个环境变量在中介时空模式中的潜在作用。八个动态(如太阳辐射、叶绿素-a浓度、气温)和两个静态(潮汐差、靠近沙滩)。通过这种方法,我们确定了关键的预测因素,并开发了两种内石器时代殖民概率模型:一个具有最小但信息量很大的预测因素的简约模型,以及一个包含更广泛相关变量集的包容性模型。结果太阳辐射和叶绿素-a浓度是最强的预测因子,特别是对中小型贻贝。模式预测揭示了不同季节和纬度的内生虫害模式:7月至10月(夏季至初秋)45°N至55°N之间的低概率;3 - 5月(冬末至早春)在30°N ~ 45°N之间的概率较低;7 - 1月(夏季至初冬)在20°N ~ 30°N之间概率较高。我们的研究结果强调了贻贝-内石相互作用的复杂性和动态性,以及环境背景在形成共生关系中的关键作用。长期的时空预测揭示了明显的季节性生物侵蚀概率,并强调了在气候变化下监测贻贝床的必要性。这些发现有助于更广泛地了解贻贝与内石的相互作用,并为解释潜在的生态变化提供了背景。
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引用次数: 0
Evidence for Widespread Inter-Basin Vicariance of Fishes Associated With Quiescent Geologic Features in the Southeastern United States 与美国东南部静止地质特征相关的鱼类广泛盆地间变异的证据
IF 3.6 2区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2026-02-13 DOI: 10.1111/jbi.70161
Bryson G. Hilburn, Byron J. Freeman, Eric J. Walther, Mary C. Freeman, David S. Leigh, John P. Wares
<div> <section> <h3> Aim</h3> <p>Stream captures are implicated as drivers of speciation in many groups of lotic fishes. In the southeastern United States, numerous stream-dwelling animals possess restricted trans-divide populations at localities where quiescent geologic features intersect drainage divides, suggesting potential evidence for inter-basin vicariance via stream capture. However, there has not yet been a comprehensive quantitative biogeographical analysis of these patterns. Herein, we present evidence for widespread patterns of evolutionarily recent inter-basin vicariant events across major geologic structures that have been tectonically dormant for many millions of years.</p> </section> <section> <h3> Location</h3> <p>Southeastern North America.</p> </section> <section> <h3> Taxon</h3> <p>Freshwater fishes.</p> </section> <section> <h3> Methods</h3> <p>We used Kriging spatial interpolation analysis on a dataset of 5434 sample sites (~188,000 species-specific distribution records) that included ~375 fish species to visualise patterns of aberrant fish distribution records across highland physiographic regions of Alabama, Georgia, Tennessee, and the Carolinas (USA). These patterns were further explored with a comprehensive synthesis of published fish distribution maps and museum records. We collected cytochrome-<i>b</i> sequence data from 337 individual fish of 14 representative ‘transferred’ species (20 intraspecies population pairs) from ~11 paired localities across the Brevard Fault, Allatoona Fault, and Blue Ridge Escarpment implicated in inter-basin captures to estimate coarse timing of vicariant events and to infer distributional artefacts caused by anthropogenic introduction.</p> </section> <section> <h3> Results</h3> <p>A heatmap generated from Kriging analysis shows a concentration of aberrant distributional records of fishes around the Brevard Fault Zone and the Blue Ridge Escarpment and other more minor quiescent geologic features. Our synthesis of museum records and fish distribution literature revealed documented evidence of a total of 115 species-transfer incidences (52 taxa) that exhibit inter-basin transfer along these features. Of the 20 intraspecies population pairs examined for genetic diversity, measures of <i>Φ</i><sub>ST</sub> and associated AMOVA <i>p</i>-values indicate significant levels of genetic divergence for 13.</p> </section> <section> <h3> Main Conclusions</h3> <p>Large-scale, quiescent geologic structures appear to drive localise
Aim Stream捕获在许多鱼群中被认为是物种形成的驱动因素。在美国东南部,在静止的地质特征与水系分水岭相交的地方,许多生活在溪流中的动物拥有有限的跨分水岭种群,这表明了通过溪流捕获来实现流域间迁移的潜在证据。然而,目前还没有对这些模式进行全面定量的生物地理学分析。在此,我们提供了证据,证明了在构造上休眠了数百万年的主要地质构造中,最近发生的盆地间替换事件的广泛进化模式。地理位置:北美东南部。淡水鱼分类群。方法采用Kriging空间插值分析方法,对美国阿拉巴马州、佐治亚州、田纳西州和卡罗来纳州(美国)高地地理区域的5434个样点(约188,000种特定物种分布记录)、约375种鱼类的分布记录进行可视化分析。通过全面综合已出版的鱼类分布图和博物馆记录,进一步探讨了这些模式。我们收集了14个代表性“转移”物种(20个种内种群对)的337条鱼的细胞色素-b序列数据,这些鱼来自布里瓦尔德断层、阿拉托纳断层和蓝岭悬崖上涉及盆地间捕获的约11个成对地点,以估计替代事件的粗略时间,并推断由人为引入引起的分布人工制品。结果克里格分析生成的热图显示,在布里瓦德断裂带和蓝岭断崖附近以及其他较小的静止地质特征周围集中了异常的鱼类分布记录。我们综合了博物馆记录和鱼类分布文献,发现了沿这些特征表现出流域间转移的115个物种转移事件(52个分类群)的文献证据。在对遗传多样性进行研究的20个种内种群对中,ΦST和相关AMOVA p值的测量表明,13个种群存在显著的遗传差异。大规模的、静止的地质构造似乎通过形成捕获者和受害支流的不同侵蚀速率,通过河流捕获来驱动局部的替代事件。在高原地区,河流捕获是流域间范围扩张和水生动物多样化的普遍过程。
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引用次数: 0
When Good Fit Goes Bad: Identifying and Minimising Overfitting in Ecological Niche Models 当良好的拟合变坏:识别和最小化生态位模型中的过度拟合
IF 3.6 2区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2026-02-12 DOI: 10.1111/jbi.70165
Diana Sousa-Guedes, A. Márcia Barbosa, Salvador Arenas-Castro, João C. Campos, Neftalí Sillero

Aim

To synthesise current understanding of overfitting as a pervasive and often underdiagnosed problem in correlative ecological niche models (ENMs), and to assess its consequences for model interpretation, generalisation and transferability under contemporary data and methodological practices.

Location

Worldwide.

Methods

We reviewed the ENM literature, synthesising theoretical and empirical studies that address the detection and treatment of overfitting. We examined diagnostic approaches, including spatially and environmentally structured cross-validation, and evaluated modelling practices related to sampling bias, predictor choice, study area definition, model complexity and regularisation.

Results

Common warning signs of overfitting include large discrepancies between training and testing performance, fragmented or ecologically implausible prediction maps and unrealistic response curves. Spatially and environmentally structured cross-validation approaches are effective for assessing data independence and diagnosing inflated performance estimates. Although multiple mitigation strategies can reduce overfitting, the persistent lack of generalisation often reflects limitations related to data quality, spatial and environmental scale, and violated ecological assumptions rather than modelling choices alone.

Main Conclusions

Predictive accuracy alone is insufficient for evaluating correlative ENMs. Ecological plausibility, interpretability and consistency with known species distributions are equally important for assessing model reliability. We advocate for iterative model evaluation, explicit consideration of ecological assumptions, and transparent reporting as best practices to improve the trustworthiness and transferability of ENMs in ecological research and conservation planning.

目的:综合当前对相关生态位模型(enm)中普遍存在且经常未被诊断的过拟合问题的理解,并评估其在当代数据和方法实践下对模型解释、推广和可转移性的影响。位置 全球。方法我们回顾了ENM文献,综合了解决过拟合的检测和处理的理论和实证研究。我们研究了诊断方法,包括空间和环境结构交叉验证,并评估了与抽样偏差、预测器选择、研究区域定义、模型复杂性和正则化相关的建模实践。结果过拟合的常见警告信号包括训练和测试性能之间的巨大差异,碎片化或生态上不合理的预测图以及不现实的响应曲线。空间和环境结构化交叉验证方法对于评估数据独立性和诊断虚高的性能估计是有效的。虽然多种缓解战略可以减少过度拟合,但持续缺乏泛化往往反映了与数据质量、空间和环境尺度有关的局限性,并且违反了生态假设,而不仅仅是建模选择。主要结论单纯预测准确度不足以评价相关ENMs。生态合理性、可解释性和与已知物种分布的一致性对于评估模型的可靠性同样重要。我们提倡将迭代模型评估、明确考虑生态假设和透明报告作为最佳实践,以提高生态研究和保护规划中环境模型的可信度和可转移性。
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引用次数: 0
Long-Term Dispersal Ability and Climate Drive Genetic and Biogeographic Divergence in Two Lizards With Contrasting Distribution Ranges 具有不同分布范围的两种蜥蜴的长期扩散能力和气候驱动遗传和生物地理差异
IF 3.6 2区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2026-02-10 DOI: 10.1111/jbi.70164
Shan Su, Wei Qian, Lu-Wen Zhang, Xiang-Mo Li, Li Ma, Xiao-Ming Wang, Zheng-Huan Wang, Xiang Ji

Aims

Long-term dispersal ability fundamentally shapes genetic structure and biogeographic patterns, yet its role in driving divergence between closely related species with contrasting ranges remains less explored. Here, we assess its influence on genetic differentiation and range dynamics in two Eremias lizards, the widespread E. argus and the narrowly distributed E. brenchleyi.

Location

Northeast, Central North, and Northwest China.

Taxon

Mongolia racerunner Eremias argus and Ordos racerunner Eremias brenchleyi (Sauria: Lacertidae).

Methods

We sequenced two mitochondrial (COI and cyt b) genes from 240 E. argus and 98 E. brenchleyi adults across their Chinese ranges, performed phylogenetic analyses using Maximum Likelihood and Bayesian Inference, assessed genetic diversity and differentiation via haplotype metrics and pairwise FST, and projected suitable habitats under past, present and future climates using ensemble species distribution models (SDMs).

Results

The two species diverged approximately 4.28 million years ago. Eremias brenchleyi exhibited strong isolation-by-distance, high genetic differentiation, and limited post-LGM (Last Glacial Maximum) demographic expansion, indicating topography-constrained dispersal. In contrast, E. argus showed higher genetic connectivity and rapid expansion from the late LGM to the post-glacial period. SDMs indicate that E. argus expanded following the LGM, while E. brenchleyi persisted in restricted ranges. By 2070, both species are projected to expand northward under SSP2-4.5 and SSP5-8.5, with E. brenchleyi benefiting more from warming in net range gain.

Main Conclusions

Long-term dispersal ability, interacting with landscape and climate, drives genetic and biogeographic divergence. Eremias brenchleyi remains vulnerable to isolation and genetic erosion, while E. argus is threatened by climate-driven range loss. Their contrasting responses underscore the necessity of integrating genetic and environmental data to understand species resilience under climate change.

长期扩散能力从根本上塑造了遗传结构和生物地理模式,但它在驱动具有不同范围的近亲物种之间的分化方面的作用仍然很少被探索。在此,我们评估了它对两种埃米亚蜥蜴的遗传分化和范围动态的影响,即广泛分布的阿格斯蜥蜴和分布狭窄的布伦切利蜥蜴。工作地点:中国东北,中北部和西北部。分类群蒙古长尾狼和鄂尔多斯长尾狼(蜥蜴亚目:狼科)。方法对240只argus成虫和98只brenchleyi成虫的两个线粒体(COI和cyt b)基因进行了测序,利用最大似然和贝叶斯推断进行了系统发育分析,利用单倍型指标和成对FST评估了遗传多样性和分化,并预测了过去、利用整体物种分布模型(SDMs)研究当前和未来气候。结果这两个物种大约在428万年前分化。布伦切利沙蚤表现出较强的距离隔离性、较高的遗传分化和有限的末次冰期后人口扩张,表明其扩散受地形限制。相比之下,从LGM晚期到冰期后,阿古螺表现出较高的遗传连通性和快速扩张。SDMs表明,随着LGM的扩大,阿格斯e.g arus扩大,而布伦切利e.g brenchleyi在有限的范围内持续存在。预计到2070年,这两个物种都将在SSP2-4.5和SSP5-8.5下向北扩张,布伦切利e.b renchleyi从变暖的净范围增加中受益更多。长期扩散能力与景观和气候相互作用,驱动遗传和生物地理差异。布伦切利埃米斯仍然容易受到隔离和遗传侵蚀的影响,而阿格斯埃米斯则受到气候导致的活动范围减少的威胁。他们的对比反应强调了整合遗传和环境数据来理解物种在气候变化下的适应能力的必要性。
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引用次数: 0
“Von Humboldt's Nightmare: Effects of Climate Change on the Plant Biodiversity of Mount Chimborazo (Tropical Andes)” Relies on Contemporary Data, Not Historical: A Reply to Renner “洪堡的噩梦:气候变化对钦博拉索山(热带安第斯山脉)植物生物多样性的影响”依赖于当代数据,而不是历史数据:对雷纳的回复
IF 3.6 2区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2026-02-09 DOI: 10.1111/jbi.70163
Tuany Siqueira-Silva, Jesús López-Angulo, Miguel Ángel Olalla-Tárraga, Pablo Ariel Martinez

Renner recently offered a historical overview of Alexander von Humboldt and Aimé Bonpland's expeditions in the Tropical Andes and raises concerns regarding Siqueira-Silva and colleagues, previously published in this journal. We clarify that these concerns arise from a misinterpretation of our data sources and analytical framework. Our study did not incorporate von Humboldt and Bonpland's collections, vegetation belts, or the Tableau Physique des Andes (TPA) into analyses or inferences. The initial species list was based on 21st century expeditions to Mt. Chimborazo and taxonomically standardised. All occurrence data were obtained from georeferenced GBIF records, and final analyses were conducted using 109 well-performing species distribution models. Elevational belts were defined using the variable itself on Mt. Chimborazo, independent of historical classifications. While acknowledging importance of historical perspectives, our results rely on contemporary data and are consistent with the global literature on climate change impacts on mountain biodiversity.

Renner最近提供了Alexander von Humboldt和aim Bonpland在热带安第斯山脉探险的历史概述,并提出了对Siqueira-Silva及其同事的担忧,该研究之前发表在该杂志上。我们澄清,这些担忧源于对我们的数据来源和分析框架的误解。我们的研究没有将von Humboldt和Bonpland的收集、植被带或地形地貌(TPA)纳入分析或推论。最初的物种清单是基于21世纪对钦博拉索山的探险和分类标准化。所有发生数据均来自地理参考GBIF记录,并使用109个性能良好的物种分布模型进行最终分析。在钦博拉索山上使用变量本身定义高程带,独立于历史分类。虽然承认历史视角的重要性,但我们的结果依赖于当代数据,并且与气候变化对山地生物多样性影响的全球文献一致。
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引用次数: 0
Eco-Evolutionary Drivers of Body Size Variation in Arthropods, With a Focus on Spiders 节肢动物体型变化的生态进化驱动因素,以蜘蛛为中心
IF 3.6 2区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2026-02-06 DOI: 10.1111/jbi.70158
Camille Ameline, Denis Lafage, Mickaël Hedde, Philippe Vernon, Julien Pétillon

Aim

Body size has been used thoroughly in arthropod ecology as a reliable trait to assess fitness responses to changes in environmental factors. We aim to assess general patterns of intraspecific body size variation along macroecological gradients in arthropods. We more specifically discuss these patterns in spiders, as they represent a large and diverse group, colonising most terrestrial habitats.

Location: Global.

Time Period: 1982–2024.

Major Taxa Studied: Arthropods.

Methods

We propose a systematic review and a meta-analysis of 146 studies on intraspecific body size variation in arthropods over two main macroecological spatial gradients—latitude and elevation—both of high interest in a global warming context.

Results

We found that more species with direct than with indirect development present a converse Bergmann cline along both gradients.

Main Conclusions

We propose that life history traits such as voltinism, mobility and brood care influence intraspecific body size patterns—potentially hiding large-scale patterns. This review gathers empirical data about body size variation along elevational and latitudinal gradients in arthropods, providing a step forward to a better understanding of the underlying mechanisms driving body size variation.

目的:在节肢动物生态学中,体型是评估动物适应环境变化的可靠指标。我们的目的是评估节肢动物沿宏观生态梯度的种内体型变化的一般模式。我们更具体地讨论蜘蛛的这些模式,因为它们代表了一个庞大而多样化的群体,在大多数陆地栖息地定居。地点:全球。时间:1982-2024。研究的主要分类群:节肢动物。方法对146项节肢动物种内体型变化在纬度和海拔两个主要宏观生态空间梯度上的研究进行了系统回顾和meta分析,这两个空间梯度在全球变暖背景下都很重要。结果直接发育的物种比间接发育的物种在两个梯度上都表现出相反的伯格曼梯度。我们认为,诸如自愿行为、移动性和育雏等生活史特征影响了种内体型模式,可能隐藏了大规模的体型模式。本文收集了节肢动物体大小沿海拔和纬度梯度变化的经验数据,为更好地理解驱动体大小变化的潜在机制提供了一步。
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引用次数: 0
Assessing Synergistic Habitat Changes and Interspecific Relationships of Small Pelagic Species in the Northwest Pacific Ocean 西北太平洋小型中上层海洋物种的协同生境变化和种间关系评估
IF 3.6 2区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2026-02-06 DOI: 10.1111/jbi.70156
Xingnan Fang, Qinwang Xing, Xinjun Chen, Jie Cao, Wei Yu

Aim

Small pelagic species constitute a critical component of fishery resources in the northwest Pacific Ocean. Understanding the interactions among interspecific relationships, environmental niches, and resource abundance is essential for developing science-based fisheries management. This study aims to investigate the differential habitat responses of small pelagic species in the Northwest Pacific to environmental factors, specifically evaluating the ecological interpretation of interspecific relationships through joint species distribution modelling.

Location

The northwest Pacific Ocean.

Taxon

Japanese sardine; Chub mackerel; neon flying squid.

Methods

This study examined three economically important small pelagic species from the northwest Pacific Ocean: Japanese sardine (Sardinops melanostictus), chub mackerel (Scomber japonicus) and neon flying squid (Ommastrephes bartramii). Using a joint species distribution model (JSDM) and ecological niche theory, we integrated multiple environmental variables to analyse interspecific associations and patterns of synchronous habitat variation among these species.

Results

The JSDM accurately predicted suitable habitats for all three species, revealing spatial synchrony in habitat suitability. Notably, a positive interspecific (0.9) association is observed between S. melanostictus and S. japonicus, while both exhibit negative associations (−0.84 and −0.95) with O. bartramii. The breadth of suitable ecological niches for key environmental factors and their corresponding response curves offers ecological insights into these interspecific interactions, confirming the dynamic variations in suitable habitat ranges for these species.

Main Conclusions

The interspecific relationships reflected similar species responses to environmental factors and highlighted their occupation of overlapping ecological niches. This consistency in environmental responses may drive synchronised habitat shifts, potentially affecting fluctuations in small pelagic species abundance.

目的小型中上层鱼类是西北太平洋渔业资源的重要组成部分。了解种间关系、环境生态位和资源丰度之间的相互作用对于发展科学的渔业管理至关重要。本研究旨在探讨西北太平洋小型远洋物种对环境因子的生境差异响应,通过联合物种分布模型评估种间关系的生态学解释。地理位置:西北太平洋。日本沙丁鱼;白鲑鲭鱼;霓虹飞天乌贼。方法研究了西北太平洋3种具有重要经济价值的小型中上层鱼类:日本沙丁鱼(Sardinops melanotictus)、鲐鱼(Scomber japonicus)和飞鱼(Ommastrephes bartramii)。采用联合物种分布模型(JSDM)和生态位理论,综合多种环境变量,分析了这些物种间的种间联系和同步生境变化模式。结果JSDM准确预测了三种物种的适宜生境,揭示了生境适宜性的空间同步性。值得注意的是,S. melanotictus和S. japonicus与O. bartramii的种间正相关(- 0.84和- 0.95)为正相关(- 0.9)。关键环境因子适宜生态位的宽度及其相应的响应曲线为这些种间相互作用提供了生态学视角,证实了这些物种适宜生境范围的动态变化。主要结论种间关系反映了物种对环境因子的相似响应,并突出了它们占据重叠的生态位。环境反应的这种一致性可能推动栖息地的同步变化,可能影响小型远洋物种丰度的波动。
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引用次数: 0
Biogeographic Regions Within Indomalaya: An Integrated Approach Using Bird Distributions Indomalaya的生物地理区域:利用鸟类分布的综合方法
IF 3.6 2区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2026-02-05 DOI: 10.1111/jbi.70155
Zheng Oong, Sharon A. Jansa, Sushma Reddy
<div> <section> <h3> Aim</h3> <p>Biogeographic regions define areas of shared species distributions and provide a framework for testing evolutionary hypotheses. Recent quantitative methods have improved the delineation of these regions, but each relies on assumptions about how species distributions are summarised and varies in sensitivity to spatial scale. Investigating how these assumptions affect biogeographic inferences is an important but often overlooked part of biogeographic analyses. Here, we compare three modern delineation methods and evaluate their ability to infer biologically meaningful biogeographic regions for birds across Indomalaya.</p> </section> <section> <h3> Location</h3> <p>The Indomalayan Biogeographic Realm.</p> </section> <section> <h3> Methods</h3> <p>We apply three area delineation methods (NDM, Ecostructure, and Hierarchical Clustering) to the distributions of 1544 native resident bird species of Indomalaya at four spatial scales (i.e., grid resolutions of 0.5°, 1°, 2°, 5°). We compare the results and discuss the strengths and weaknesses of each method with respect to issues related to analytical resolution, input data, and regional geomorphology.</p> </section> <section> <h3> Results</h3> <p>Each method produced different sets of areas and was differently impacted by analytical resolution. Each method also displayed unique problems when identifying small areas and continental areas with more diffuse boundaries. Nonetheless, all methods consistently found four large biogeographic units congruent with our understanding of the geological history of Indomalaya.</p> </section> <section> <h3> Main Conclusions</h3> <p>While the three methods in our study showed broad agreement in results as well as similar sensitivity to analytical resolutions, each method displayed different strengths and weaknesses in relation to the challenges of delineating biogeographic areas. NDM and hierarchical clustering are more effective at identifying regional-scale areas of high endemicity, assuming there is strong spatial signal for the former and sufficient taxon dissimilarity between areas for the latter. Ecostructure and hierarchical clustering are effective at partitioning a large study area into broad, continuous biogeographic areas, but the former is more effective at visualising uncertainty of continental boundaries. By integrating results across multiple methods, we gain a more enriched view of the complex biogeographic history in the Indo
目的生物地理区域界定了共有物种分布的区域,并为检验进化假说提供了一个框架。最近的定量方法改进了对这些区域的描述,但每一种方法都依赖于对物种分布如何总结和对空间尺度的敏感性变化的假设。研究这些假设如何影响生物地理推断是生物地理分析中一个重要但经常被忽视的部分。在这里,我们比较了三种现代划分方法,并评估了它们推断Indomalaya鸟类生物地理区域的能力。Indomalayan生物地理领域。方法采用3种区域划分方法(NDM、Ecostructure和Hierarchical Clustering)对Indomalaya 1544种本地留鸟在4个空间尺度(即0.5°、1°、2°和5°的网格分辨率)上的分布进行划分。我们比较了结果,并讨论了与分析分辨率、输入数据和区域地貌相关的问题上每种方法的优缺点。结果每种方法产生的区域集不同,受分析分辨率的影响也不同。每种方法在识别边界较分散的小区域和大陆区域时也显示出独特的问题。尽管如此,所有方法都一致地发现了四个与我们对Indomalaya地质历史的理解一致的大型生物地理单元。虽然我们研究中的三种方法在结果上表现出广泛的一致性以及对分析分辨率的相似敏感性,但每种方法在描述生物地理区域的挑战方面都表现出不同的优势和劣势。如果NDM具有较强的空间信号,而等级聚类具有足够的区间分类单元差异性,则NDM和等级聚类在区域尺度上识别高地方性区更为有效。生态结构和分层聚类在将大型研究区域划分为广泛、连续的生物地理区域方面是有效的,但前者在可视化大陆边界的不确定性方面更有效。通过综合多种方法的结果,我们对印多马拉雅地区复杂的生物地理历史有了更丰富的认识。
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引用次数: 0
Latitudinal Variation in Trematode Prevalence Across Regions in North and South America: Evidence of an Inverse Gradient in Second-Intermediate and Final Hosts 北美和南美地区吸虫流行率的纬度变化:第二、中间和最终宿主呈反梯度的证据
IF 3.6 2区 环境科学与生态学 Q2 ECOLOGY Pub Date : 2026-02-03 DOI: 10.1111/jbi.70157
Christopher Moore, Krista McCoy, Michael McCoy

Aim

We tested whether the inverse latitudinal diversity gradient (LDG) observed for trematode parasites in first-intermediate snail hosts extends to second-intermediate and definitive host taxa.

Location

Sub-tropical to temperate latitudinal zones (±23°–47.6°) in North and South America.

Taxon

Trematode parasites (Class: Digenea); crustacean second-intermediate hosts (Infra-order: Brachyura; Anomura); fish second-intermediate hosts (Class: Actinopterygii); and fish final hosts (Class: Actinopterygii).

Methods

Using meta-analysis, we reviewed and synthesised existing evidence on trematode prevalence across latitudes, focusing on studies that reported these parasites in intertidal species of crustaceans and cryptobenthic fishes. We evaluated whether infection prevalence at the second-intermediate and final host stages followed an inverse LDG.

Results

Evidence indicates that trematode prevalence in second-intermediate and definitive hosts is greater at higher latitudes, consistent with an inverse LDG. This is counter to expectations given the higher diversity of potential hosts near the equator.

Main Conclusions

Trematode parasites may exhibit an inverse LDG due to temperature-dependent coevolutionary dynamics. At lower latitudes, higher temperatures likely increase parasite virulence, leading to greater parasite-induced mortality and reduced parasite persistence. More research is needed that quantifies trematode prevalence in the same hosts from tropical to temperate latitudinal zones, as broader biogeographic studies would offer insight into Red Queen dynamics.

目的研究吸虫寄生在第一中级蜗牛寄主中的反向纬度多样性梯度(LDG)是否延伸到第二中级和终末寄主类群。地理位置:南北美洲亚热带至温带纬度地带(±23°-47.6°)。吸虫寄生虫分类群(蜱螨纲);甲壳类第二中间寄主(次目:腕足目;反常目);鱼类第二中间寄主(纲:放线鱼科);鱼类最终寄主(放线鱼纲)。方法采用荟萃分析方法,回顾和综合了各纬度吸虫流行的现有证据,重点研究了这些寄生虫在潮间带甲壳类动物和隐底栖鱼类中的研究。我们评估了第二、中间和最后宿主阶段的感染流行是否遵循逆LDG。结果有证据表明,吸虫在第二、中期和最终宿主中的流行率在高纬度地区更高,与LDG相反。考虑到赤道附近潜在寄主的多样性更高,这与预期相反。主要结论吸虫寄生虫可能由于温度依赖的共同进化动力学而表现出逆LDG。在低纬度地区,较高的温度可能会增加寄生虫的毒力,导致更高的寄生虫引起的死亡率和减少寄生虫的持久性。需要更多的研究来量化从热带到温带纬度带的同一宿主中吸虫的流行情况,因为更广泛的生物地理学研究将提供对红皇后动态的深入了解。
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引用次数: 0
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Journal of Biogeography
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