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Correlation between bioluminescent blinks and swimming behavior in the splitfin flashlight fish Anomalops katoptron 裂鳍闪光鱼的生物发光闪烁与游泳行为之间的相关性
IF 3.4 Q1 Agricultural and Biological Sciences Pub Date : 2024-07-10 DOI: 10.1186/s12862-024-02283-6
Peter Jägers, Timo Frischmuth, Stefan Herlitze
The light organs of the splitfin flashlight fish Anomalops katoptron are necessary for schooling behavior, to determine nearest neighbor distance, and to feed on zooplankton under dim light conditions. Each behavior is coupled to context-dependent blink frequencies and can be regulated via mechanical occlusion of light organs. During shoaling in the laboratory individuals show moderate blink frequencies around 100 blinks per minute. In this study, we correlated bioluminescent blinks with the spatio-temporal dynamics of swimming profiles in three dimensions, using a stereoscopic, infrared camera system. Groups of flashlight fish showed intermediate levels of polarization and distances to the group centroid. Individuals showed higher swimming speeds and curved swimming profiles during light organ occlusion. The largest changes in swimming direction occurred when darkening the light organs. Before A. katoptron exposed light organs again, they adapted a nearly straight movement direction. We conclude that a change in movement direction coupled to light organ occlusion in A. katoptron is an important behavioral trait in shoaling of flashlight fish.
裂鳍闪光鱼(Anomalops katoptron)的光器官是在暗光条件下进行求偶行为、确定近邻距离和捕食浮游动物所必需的。每种行为都与上下文相关的眨眼频率有关,并可通过机械闭合光器官进行调节。在实验室中,个体在浅滩活动时的眨眼频率适中,约为每分钟 100 次。在这项研究中,我们利用立体红外摄像系统,将生物发光眨眼与三维游泳剖面的时空动态联系起来。成群的手电筒鱼显示出中等水平的极化和到群体中心点的距离。在光器官闭塞时,个体表现出较高的游泳速度和弯曲的游泳曲线。光器官变暗时,游动方向的变化最大。在A. katoptron再次暴露出光器官之前,它们适应了近乎笔直的运动方向。我们的结论是,在光器官闭合的情况下,A. katoptron的运动方向会发生变化,这是手电筒鱼趋滩的一个重要行为特征。
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引用次数: 0
Home range of three turtle species in Central Yucatan. A comparative study 尤卡坦半岛中部三种海龟的家园范围。比较研究
IF 3.4 Q1 Agricultural and Biological Sciences Pub Date : 2024-05-29 DOI: 10.1186/s12862-024-02258-7
Ivette Enríquez-Mercado, Taggert G. Butterfield, Rafael Aguilar-Romero, Rodrigo Macip-Ríos
Home range is a fundamental characteristic of an animal natural history. The study of home range provides information on the sites where organisms forage for food, find shelter, or locate mates. Home range size and shape can change throughout the lifespan of an organism, during the year, or across seasons, driven by resource availability and the basic needs for each organism. For freshwater and semi-aquatic turtles, home range is greatly affected by water availability, humidity, and temperature throughout the year, nevertheless demographic factors such age and sex are also important determinants of home range size. In this study we estimated home range and dispersal movements for Kinosternon creaseri, Terrapene yucatana, and Rhinoclemmys areolata in a semi-tropical dry forest in central Yucatán. For a two-year period, turtles were surveyed using hoop traps and visual encounters. Twenty-one individuals (5–8 per species) were equipped with radio transmitters to track them across the landscape. Distances between relocations and home range were compared across species seasons, sex, and interactions of these variables. Monthly average movements were positively correlated with rain in the three species studied. Home range of R. areolata was larger than those of K. creaseri and T. yucatana. Home range of the three studied species were larger during the wet season. Home range overlap index within same species individuals was higher during the rainy than dry season, but overall overlap is low between and within species. Comparative studies of home range in sympatric organisms can shed light on how organisms partition resources to co-exist, and identify the habitat needs for each species. We compared the home range and movement of three sympatric turtle species on the Yucatan Peninsula, Mexico, a habitat characterized as semideciduous dry forest. Home range and movements differ among species and seasons. Turtles move larges distances and have larger home ranges during the rainy season, while their home range shrank during the dry season, when some species estivate, while others occupy permanent water bodies. Our results show that home range is related to season and water availability for the species studied, which used different of microhabitats, with Kinosternon creaseri used sartenejas and rock shelters, while Rhinoclemmys areolate used wooded debris and leaf litter microhabitats, finally, Terrapene yucatana was observed in rocky and woody debris microhabitats.
家园范围是动物自然史的一个基本特征。对家域的研究提供了有关生物觅食、寻找栖息地或交配地点的信息。受资源可用性和每种生物基本需求的影响,家园范围的大小和形状会在生物的整个生命周期、一年中或不同季节发生变化。对于淡水和半水栖龟类来说,家园范围在很大程度上受全年水源、湿度和温度的影响,然而年龄和性别等人口因素也是决定家园范围大小的重要因素。在这项研究中,我们估算了尤卡坦半岛中部半热带干旱森林中金龟子(Kinosternon creaseri)、尤卡坦海龟(Terrapene yucatana)和犀龟(Rhinoclemmys areolata)的家园范围和扩散运动。在为期两年的时间里,我们使用环形诱捕器和目测法对海龟进行了调查。21 只海龟(每个物种 5-8 只)安装了无线电发射器,以便在整个地形中跟踪它们。比较了不同物种在不同季节、不同性别以及这些变量相互作用下的迁移距离和家园范围。在所研究的三个物种中,月平均迁移量与雨量呈正相关。R.areolata的家园范围大于K.creaseri和T.yucatana。所研究的三个物种在雨季的活动范围更大。同种个体的巢区重叠指数雨季高于旱季,但种间和种内的总体重叠率较低。对同域生物的家园范围进行比较研究,可以揭示生物如何分配资源以实现共存,并确定每个物种对生境的需求。我们比较了墨西哥尤卡坦半岛上三种同域海龟的家园范围和移动情况,该栖息地的特点是半落叶干燥森林。不同物种和不同季节的家园范围和移动情况各不相同。在雨季,海龟的移动距离更远,家园范围更大;而在旱季,海龟的家园范围缩小,一些海龟在旱季迁徙,另一些则占据永久性水体。我们的研究结果表明,对所研究的物种而言,家园范围与季节和水的供应有关,这些物种使用不同的微生境,其中 Kinosternon creaseri 使用 sartenejas 和岩石庇护所,而 Rhinoclemmys areolate 使用木屑和落叶微生境,最后,Terrapene yucatana 在岩石和木屑微生境中被观察到。
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引用次数: 0
Variation and plasticity in life-history traits and fitness of wild Arabidopsis thaliana populations are not related to their genotypic and ecological diversity 拟南芥野生种群生命史特征和适应性的变异和可塑性与其基因型和生态多样性无关
IF 3.4 Q1 Agricultural and Biological Sciences Pub Date : 2024-05-03 DOI: 10.1186/s12862-024-02246-x
Raul de la Mata, Almudena Mollá-Morales, Belén Méndez-Vigo, Rafael Torres-Pérez, Juan Carlos Oliveros, Rocío Gómez, Arnald Marcer, Antonio R. Castilla, Magnus Nordborg, Carlos Alonso-Blanco, F. Xavier Picó
Despite its implications for population dynamics and evolution, the relationship between genetic and phenotypic variation in wild populations remains unclear. Here, we estimated variation and plasticity in life-history traits and fitness of the annual plant Arabidopsis thaliana in two common garden experiments that differed in environmental conditions. We used up to 306 maternal inbred lines from six Iberian populations characterized by low and high genotypic (based on whole-genome sequences) and ecological (vegetation type) diversity. Low and high genotypic and ecological diversity was found in edge and core Iberian environments, respectively. Given that selection is expected to be stronger in edge environments and that ecological diversity may enhance both phenotypic variation and plasticity, we expected genotypic diversity to be positively associated with phenotypic variation and plasticity. However, maternal lines, irrespective of the genotypic and ecological diversity of their population of origin, exhibited a substantial amount of phenotypic variation and plasticity for all traits. Furthermore, all populations harbored maternal lines with canalization (robustness) or sensitivity in response to harsher environmental conditions in one of the two experiments. Overall, we conclude that the environmental attributes of each population probably determine their genotypic diversity, but all populations maintain substantial phenotypic variation and plasticity for all traits, which represents an asset to endure in changing environments.
尽管野生种群的遗传变异和表型变异对种群动态和进化有影响,但两者之间的关系仍不清楚。在这里,我们在两个环境条件不同的普通花园实验中估测了一年生植物拟南芥生命史性状和适应性的变异和可塑性。我们使用了来自六个伊比利亚种群的多达 306 个母本近交系,这些种群的特点是基因型(基于全基因组序列)和生态(植被类型)多样性较低和较高。伊比利亚边缘环境和核心环境的基因型和生态多样性分别较低和较高。鉴于边缘环境中的选择作用会更强,而且生态多样性可能会增强表型变异和可塑性,我们预计基因型多样性与表型变异和可塑性呈正相关。然而,母本品系无论其原生种群的基因型和生态多样性如何,在所有性状上都表现出大量的表型变异和可塑性。此外,在两个实验中的一个实验中,所有种群的母本品系都具有渠化(稳健性)或对更恶劣环境条件的敏感性。总之,我们得出的结论是,每个种群的环境属性可能决定了它们的基因型多样性,但所有种群在所有性状上都保持了大量的表型变异和可塑性,这代表了一种在不断变化的环境中经久不衰的资产。
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引用次数: 0
Does local soil factor drive functional leaf trait variation? A test on Neilingding Island, South China 当地土壤因子是否驱动叶片功能性状变异?在中国南方内伶仃岛进行的测试
IF 3.4 Q1 Agricultural and Biological Sciences Pub Date : 2024-04-10 DOI: 10.1186/s12862-024-02227-0
Sen Tong, Juanjuan Zhang, Xueting Qiao, Buhang Li, Qiong Yang, Ping Hu, Shixiao Yu
Leaf traits were affected by soil factors and displayed varietal differences in forest. However, few examples have been reported on the Island ecosystems. We comprehensively investigated 9 leaf traits (leaf length, leaf width, leaf area, SLA, leaf fresh weight, leaf C content, leaf N content, leaf K content, leaf C:N ratio) of 54 main subtropical woody species and soil parameters (soil pH, total C content, total N content, total K content, available N content, available P content, available K content and soil moisture) in Neilingding Island, Shenzhen, southern China. Intra-and interspecific variation of leaf traits were measured and their correlations with soil parameters were explored. The interspecific variations of leaf C:N ratio, leaf N content and leaf fresh weight were higher than their intraspecific variations. The intraspecific variation of leaf K content was larger than that of interspecific one, accounting for 80.69% of the total variance. Positive correlations were found among intraspecific coefficients of variations in leaf morphological traits. The correlation analysis between the variation of intraspecific traits and the variation of soil parameters showed that changes in soil factors affected leaf morphology and stoichiometry. The interaction between soil moisture and soil available P content was the key factor on intraspecific variations of leaf traits including leaf area, leaf fresh weight, leaf C and leaf K content. We concluded that leaf traits of plants in the island were tightly related to soil parameters. Soil parameters, especially soil moisture and available P content, affected plant leaf morphology and stoichiometry at the local scale.
叶片性状受土壤因素的影响,在森林中表现出品种差异。然而,很少有关于海岛生态系统的报道。我们对中国南方深圳内伶仃岛 54 个主要亚热带木本物种的 9 个叶片性状(叶长、叶宽、叶面积、SLA、叶鲜重、叶 C 含量、叶 N 含量、叶 K 含量、叶 C:N 比)和土壤参数(土壤 pH 值、总 C 含量、总 N 含量、总 K 含量、可利用 N 含量、可利用 P 含量、可利用 K 含量和土壤水分)进行了全面研究。测定了叶片性状的种内和种间差异,并探讨了它们与土壤参数的相关性。叶片C:N比、叶片N含量和叶片鲜重的种间差异高于种内差异。叶片 K 含量的种内变异大于种间变异,占总变异的 80.69%。叶片形态性状的种内变异系数呈正相关。种内性状变异与土壤参数变异之间的相关分析表明,土壤因子的变化会影响叶片形态和化学计量学。土壤水分和土壤可利用磷含量之间的相互作用是影响叶片面积、叶片鲜重、叶片 C 和叶片 K 含量等叶片性状种内差异的关键因素。我们的结论是,岛上植物的叶片性状与土壤参数密切相关。土壤参数,尤其是土壤水分和可利用磷含量,在当地范围内影响着植物叶片的形态和化学计量。
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引用次数: 0
Biodiversity and distribution patterns of blooming jellyfish in the Bohai Sea revealed by eDNA metabarcoding eDNA 代谢编码揭示渤海盛花水母的生物多样性和分布模式
IF 3.4 Q1 Agricultural and Biological Sciences Pub Date : 2024-03-18 DOI: 10.1186/s12862-024-02224-3
Lijing Ye, Saijun Peng, Yuanqing Ma, Wenjing Zhang, Lei Wang, Xiyan Sun, Chen Zhang, Munjira Yeasmin, Jianmin Zhao, Zhijun Dong
The mass occurrence of scyphozoan jellyfish severely affects marine ecosystems and coastal economies, and the study of blooming jellyfish population dynamics has emerged in response. However, traditional ecological survey methods required for such research have difficulties in detecting cryptic life stages and surveying population dynamics owing to high spatiotemporal variations in their occurrence. The environmental DNA (eDNA) technique is an effective tool for overcoming these limitations. In this study, we investigated the biodiversity and spatial distribution characteristics of blooming jellyfish in the Bohai Sea of China using an eDNA metabarcoding approach, which covered the surface, middle, and bottom seawater layers, and sediments. Six jellyfish taxa were identified, of which Aurelia coerulea, Nemopilema nomurai, and Cyanea nozakii were the most dominant. These three blooming jellyfish presented a marked vertical distribution pattern in the offshore regions. A. coerulea was mainly distributed in the surface layer, whereas C. nozakii and N. nomurai showed a upper-middle and middle-bottom aggregation, respectively. Horizontally, A. coerulea and C. nozakii were more abundant in the inshore regions, whereas N. nomurai was mainly distributed offshore. Spearman’s correlation analysis revealed a strong correlation between the eDNA of the three dominant blooming jellyfish species and temperature, salinity, and nutrients. Our study confirms the applicability of the eDNA approach to both biodiverstiy evaluation of blooming jellyfish and investigating their spatial distribution, and it can be used as a supplementary tool to traditional survey methods.
鞘水母的大量出现严重影响了海洋生态系统和沿海经济,因此出现了对盛开水母种群动态的研究。然而,由于水母出现的时空变化很大,此类研究需要的传统生态调查方法难以检测其隐性生命阶段和调查种群动态。环境 DNA(eDNA)技术是克服这些限制的有效工具。本研究采用 eDNA 代谢编码方法,研究了中国渤海海蜇的生物多样性和空间分布特征。共鉴定出 6 个水母类群,其中 Aurelia coerulea、Nemopilema nomurai 和 Cyanea nozakii 是最主要的水母类群。这三种开花水母在近海区域呈现明显的垂直分布模式。A. coerulea 主要分布在表层,而 C. nozakii 和 N. nomurai 则分别呈中上层和中底层聚集。在水平方向上,A. coerulea 和 C. nozakii 更多分布在近岸区域,而 N. nomurai 则主要分布在近海区域。斯皮尔曼相关分析表明,三种主要盛花水母的 eDNA 与温度、盐度和营养物质之间有很强的相关性。我们的研究证实,eDNA方法适用于盛花水母的生物多样性评估和空间分布调查,可作为传统调查方法的补充工具。
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引用次数: 0
“Patchiness” in mechanical stiffness across a tumor as an early-stage marker for malignancy 肿瘤机械刚度的 "斑块性 "是恶性肿瘤的早期标志物
IF 3.4 Q1 Agricultural and Biological Sciences Pub Date : 2024-03-14 DOI: 10.1186/s12862-024-02221-6
Zibah Mirzakhel, Gudur Ashrith Reddy, Jennifer Boman, Brianna Manns, Savannah ter Veer, Parag Katira
Mechanical phenotyping of tumors, either at an individual cell level or tumor cell population level is gaining traction as a diagnostic tool. However, the extent of diagnostic and prognostic information that can be gained through these measurements is still unclear. In this work, we focus on the heterogeneity in mechanical properties of cells obtained from a single source such as a tissue or tumor as a potential novel biomarker. We believe that this heterogeneity is a conventionally overlooked source of information in mechanical phenotyping data. We use mechanics-based in-silico models of cell-cell interactions and cell population dynamics within 3D environments to probe how heterogeneity in cell mechanics drives tissue and tumor dynamics. Our simulations show that the initial heterogeneity in the mechanical properties of individual cells and the arrangement of these heterogenous sub-populations within the environment can dictate overall cell population dynamics and cause a shift towards the growth of malignant cell phenotypes within healthy tissue environments. The overall heterogeneity in the cellular mechanotype and their spatial distributions is quantified by a “patchiness” index, which is the ratio of the global to local heterogeneity in cell populations. We observe that there exists a threshold value of the patchiness index beyond which an overall healthy population of cells will show a steady shift towards a more malignant phenotype. Based on these results, we propose that the “patchiness” of a tumor or tissue sample, can be an early indicator for malignant transformation and cancer occurrence in benign tumors or healthy tissues. Additionally, we suggest that tissue patchiness, measured either by biochemical or biophysical markers, can become an important metric in predicting tissue health and disease likelihood just as landscape patchiness is an important metric in ecology.
作为一种诊断工具,肿瘤的机械表型(无论是单个细胞水平还是肿瘤细胞群水平)正受到越来越多的关注。然而,通过这些测量能获得多少诊断和预后信息仍不清楚。在这项工作中,我们重点研究了从组织或肿瘤等单一来源获得的细胞机械特性的异质性,并将其作为一种潜在的新型生物标记。我们认为,这种异质性是机械表型数据中一个传统上被忽视的信息来源。我们利用基于力学的三维环境中细胞-细胞相互作用和细胞群动态的内部模型,来探究细胞力学的异质性如何驱动组织和肿瘤的动态变化。我们的模拟结果表明,单个细胞机械特性的初始异质性以及这些异质性亚群在环境中的排列会决定细胞群的整体动态,并导致健康组织环境中恶性细胞表型的生长转变。细胞机械型及其空间分布的整体异质性可通过 "斑块度 "指数进行量化,该指数是细胞群中整体异质性与局部异质性之比。我们观察到,斑块度指数存在一个临界值,超过这个临界值,整体健康的细胞群就会稳定地向恶性表型转变。基于这些结果,我们认为肿瘤或组织样本的 "斑块度 "可以作为良性肿瘤或健康组织发生恶性转化和癌症的早期指标。此外,我们还认为,通过生化或生物物理标记测量的组织斑块度可以成为预测组织健康和疾病可能性的重要指标,就像景观斑块度是生态学中的重要指标一样。
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引用次数: 0
Lateral line system diversification during the early stages of ecological speciation in cichlid fish 慈鲷生态物种早期阶段的侧线系统多样化
IF 3.4 Q1 Agricultural and Biological Sciences Pub Date : 2024-02-20 DOI: 10.1186/s12862-024-02214-5
Duncan E. Edgley, Madeleine Carruthers, Nestory P. Gabagambi, Andrew D. Saxon, Alan M. Smith, Domino A. Joyce, Grégoire Vernaz, M. Emília Santos, George F. Turner, Martin J. Genner
The mechanosensory lateral line system is an important sensory modality in fishes, informing multiple behaviours related to survival including finding food and navigating in dark environments. Given its ecological importance, we may expect lateral line morphology to be under disruptive selection early in the ecological speciation process. Here we quantify the lateral line system morphology of two ecomorphs of the cichlid fish Astatotilapia calliptera in crater Lake Masoko that have diverged from common ancestry within the past 1,000 years. Based on geometric morphometric analyses of CT scans, we show that the zooplanktivorous benthic ecomorph that dominates the deeper waters of the lake has large cranial lateral line canal pores, relative to those of the nearshore invertebrate-feeding littoral ecomorph found in the shallower waters. In contrast, fluorescence imaging revealed no evidence for divergence between ecomorphs in the number of either superficial or canal neuromasts. We illustrate the magnitude of the variation we observe in Lake Masoko A. calliptera in the context of the neighbouring Lake Malawi mega-radiation that comprises over 700 species. These results provide the first evidence of divergence in this often-overlooked sensory modality in the early stages of ecological speciation, suggesting that it may have a role in the broader adaptive radiation process.
机械感觉侧线系统是鱼类的一种重要感觉模式,为多种与生存有关的行为提供信息,包括寻找食物和在黑暗环境中导航。鉴于侧线系统在生态学上的重要性,我们可以预期侧线系统的形态在生态物种分化过程的早期会受到破坏性选择的影响。在这里,我们量化了马索科湖火山口慈鲷(Astatotilapia calliptera)的两个异形的侧线系统形态,这两个异形是在过去 1000 年内从共同祖先分化而来的。基于 CT 扫描的几何形态计量分析,我们发现,与浅水区近岸以无脊椎动物为食的沿岸生态型相比,在湖泊深水区占主导地位的浮游底栖生态型具有较大的颅侧线管孔。与此相反,荧光成像显示,没有证据表明不同形态之间在表层或管状神经膜的数量上存在差异。我们以邻近马拉维湖的 700 多个物种为背景,说明了我们在马索科湖 A. calliptera 中观察到的变异程度。这些结果首次证明了这种经常被忽视的感觉模式在生态物种分化早期阶段的分化,表明它可能在更广泛的适应性辐射过程中发挥作用。
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引用次数: 0
The natural and human-mediated expansion of a human-commensal lizard into the fringes of Southeast Asia 一种与人类共生的蜥蜴在自然和人为因素的作用下向东南亚边缘地区扩张
IF 3.4 Q1 Agricultural and Biological Sciences Pub Date : 2024-02-20 DOI: 10.1186/s12862-024-02212-7
Benjamin R. Karin, Michael Lough-Stevens, Te-En Lin, Sean B. Reilly, Anthony J. Barley, Indraneil Das, Djoko T. Iskandar, Evy Arida, Todd R. Jackman, Jimmy A. McGuire, Aaron M. Bauer
Human-commensal species often display deep ancestral genetic structure within their native range and founder-effects and/or evidence of multiple introductions and admixture in newly established areas. We investigated the phylogeography of Eutropis multifasciata, an abundant human-commensal scincid lizard that occurs across Southeast Asia, to determine the extent of its native range and to assess the sources and signatures of human introduction outside of the native range. We sequenced over 350 samples of E. multifasciata for the mitochondrial ND2 gene and reanalyzed a previous RADseq population genetic dataset in a phylogenetic framework. Nuclear and mitochondrial trees are concordant and show that E. multifasciata has retained high levels of genetic structure across Southeast Asia despite being frequently moved by humans. Lineage boundaries in the native range roughly correspond to several major biogeographic barriers, including Wallace’s Line and the Isthmus of Kra. Islands at the outer fringe of the range show evidence of founder-effects and multiple introductions. Most of enormous range of E. multifasciata across Southeast Asia is native and it only displays signs of human-introduction or recent expansion along the eastern and northern fringe of its range. There were at least three events of human-introductions to Taiwan and offshore islands, and several oceanic islands in eastern Indonesia show a similar pattern. In Myanmar and Hainan, there is a founder-effect consistent with post-warming expansion after the last glacial maxima or human introduction.
与人类共生的物种通常在其原生地表现出深远的祖先遗传结构,而在新建立的地区则表现出始祖效应和/或多次引入和混杂的证据。Eutropis multifasciata是一种广泛分布于东南亚的与人类共生的鳞蜥,我们对其系统地理学进行了研究,以确定其原生地的范围,并评估原生地以外的人类引入的来源和特征。我们对超过 350 个 E. multifasciata 样本进行了线粒体 ND2 基因测序,并在系统发育框架内重新分析了之前的 RADseq 群体遗传数据集。核树和线粒体树是一致的,表明尽管多袋蛙经常被人类迁徙,但在整个东南亚地区仍保留了高度的遗传结构。原生地的世系边界与几个主要的生物地理屏障大致对应,包括华莱士线和克拉地峡。分布区外围的岛屿显示了始祖效应和多次引入的证据。E.multifasciata在东南亚的大部分巨大分布区都是原生的,只有在其分布区的东部和北部边缘地带才有人类引入或近期扩展的迹象。台湾和近海岛屿至少发生过三次人类引入事件,印度尼西亚东部的几个海洋岛屿也有类似情况。在缅甸和海南,有一种始祖效应,与上一个冰川极盛期后气候变暖或人类引入后的扩张一致。
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引用次数: 0
Phylogeography and phenotypic wing shape variation in a damselfly across populations in Europe 一种豆娘在欧洲不同种群间的系统地理学和表型翅形变异
IF 3.4 Q1 Agricultural and Biological Sciences Pub Date : 2024-02-03 DOI: 10.1186/s12862-024-02207-4
Y. Yildirim, D. Kristensson, D. Outomuro, D. Mikolajewski, P. Rödin Mörch, S. Sniegula, F. Johansson
Describing geographical variation in morphology of organisms in combination with data on genetic differentiation and biogeography can provide important information on how natural selection shapes such variation. Here we study genetic structure using ddRAD seq and wing shape variation using geometric morphometrics in 14 populations of the damselfly Lestes sponsa along its latitudinal range in Europe. The genetic analysis showed a significant, yet relatively weak population structure with high genetic heterozygosity and low inbreeding coefficients, indicating that neutral processes contributed very little to the observed wing shape differences. The genetic analysis also showed that some regions of the genome (about 10%) are putatively shaped by selection. The phylogenetic analysis showed that the Spanish and French populations were the ancestral ones with northern Swedish and Finnish populations being the most derived ones. We found that wing shape differed significantly among populations and showed a significant quadratic (but weak) relationship with latitude. This latitudinal relationship was largely attributed to allometric effects of wing size, but non-allometric variation also explained a portion of this relationship. However, wing shape showed no phylogenetic signal suggesting that lineage-specific variation did not contribute to the variation along the latitudinal gradient. In contrast, wing size, which is correlated with body size in L. sponsa, had a strong negative correlation with latitude. Our results suggest a relatively weak population structure among the sampled populations across Europe, but a clear differentiation between south and north populations. The observed geographic phenotypic variation in wing shape may have been affected by different local selection pressures or environmental effects.
将生物形态的地理变异与遗传分化和生物地理学数据结合起来进行描述,可以提供有关自然选择如何形成这种变异的重要信息。在此,我们利用 ddRAD seq 研究了豆娘的遗传结构,并利用几何形态计量学研究了豆娘在欧洲 14 个种群中的翅形变异。遗传分析表明,种群结构显著但相对较弱,遗传杂合度高,近交系数低,这表明中性过程对观察到的翅膀形状差异的影响很小。遗传分析还表明,基因组的某些区域(约 10%)可能是由选择形成的。系统发育分析表明,西班牙和法国种群是最古老的种群,而瑞典北部和芬兰种群是最衍生的种群。我们发现,不同种群之间的翅形差异很大,并且与纬度呈显著的二次方(但较弱)关系。这种纬度关系主要归因于翅膀大小的异速效应,但非异速变化也解释了这种关系的一部分。然而,翅膀形状没有显示出系统发育的信号,这表明纬度梯度的变化并不是由特定世系的变异造成的。与此相反,翅的大小与 L. sponsa 的体型相关,但与纬度呈强烈的负相关。我们的研究结果表明,欧洲采样种群之间的种群结构相对较弱,但南北种群之间有明显的分化。观察到的翅膀形状的地理表型差异可能受到了当地不同的选择压力或环境影响。
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引用次数: 0
Artificial light at night reduces earthworm activity but increases growth of invasive ragweed 夜间人工照明减少了蚯蚓的活动,却增加了入侵豚草的生长
IF 3.4 Q1 Agricultural and Biological Sciences Pub Date : 2024-01-19 DOI: 10.1186/s12862-024-02200-x
Marion Mittmannsgruber, Zenia Kavassilas, Bernhard Spangl, Edith Gruber, Elias Jagg, Johann G. Zaller
Artificial light at night, also referred to as light pollution (LP), has been shown to affect many organisms. However, little is known about the extent to which ecological interactions between earthworms and plants are altered by LP. We investigated the effects of LP on anecic earthworms (Lumbricus terrestris) that come to the surface at night to forage and mate, and on the germination and growth of the invasive and allergenic ragweed (Ambrosia artemisiifolia). In a full factorial pot experiment in the greenhouse, we tested four factors and their interactions: LP (5 lux vs. 0 lux at night), earthworms (two individuals vs. none), plant species (seeding of ragweed only vs. mixed with Phacelia seeds) and sowing depth (seed placed at the surface vs. in 5 cm depth). Data were analysed using Generalized Linear (Mixed) Models and multifactorial ANOVAs with soil parameters as covariates. Light pollution reduced earthworm surface activity by 76% as measured by casting activity and toothpick index; 85% of mating earthworms were observed in the absence of LP. Light pollution in interaction with earthworms reduced ragweed germination by 33%. However, LP increased ragweed height growth by 104%. Earthworms reduced ragweed germination especially when seeds were placed on the soil surface, suggesting seed consumption by earthworms. Our data suggest that anecic earthworms are negatively affected by LP because reduced surface activity limits their ability to forage and mate. The extent to which earthworm-induced ecosystem services or community interactions are also affected by LP remains to be investigated. If the increased height growth of ragweed leads to increased pollen and seed production, it is likely that the competition of ragweed with field crops and the risks to human health will also increase under LP.
夜间的人造光,也称为光污染(LP),已被证明会影响许多生物。然而,人们对蚯蚓和植物之间的生态互动受 LP 影响的程度知之甚少。我们研究了光污染对夜间到地表觅食和交配的蚯蚓(Lumbricus terrestris)的影响,以及对入侵性和过敏性豚草(Ambrosia artemisiifolia)发芽和生长的影响。在温室进行的全因子盆栽实验中,我们测试了四个因子及其相互作用:光照度(夜间 5 勒克斯与 0 勒克斯)、蚯蚓(两只与一只都没有)、植物种类(只播种豚草种子与混合法桐种子)和播种深度(将种子放在地表与放在 5 厘米深处)。数据分析采用了广义线性(混合)模型和多因素方差分析,并将土壤参数作为协变量。通过投食活动和牙签指数测量,光污染使蚯蚓地表活动减少了 76%;在无 LP 的情况下,85% 的交配蚯蚓被观察到。光污染与蚯蚓的相互作用使豚草发芽率降低了 33%。然而,LP 可使豚草的生长高度增加 104%。蚯蚓降低了豚草的发芽率,尤其是当种子被放置在土壤表面时,这表明蚯蚓消耗了种子。我们的数据表明,无刺蚯蚓受到 LP 的负面影响,因为地表活动减少限制了它们觅食和交配的能力。蚯蚓诱导的生态系统服务或群落互动在多大程度上也受到 LP 的影响还有待研究。如果豚草生长高度的增加导致花粉和种子产量的增加,那么在低浓度生产条件下,豚草与大田作物的竞争以及对人类健康的危害也可能会增加。
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BMC Evolutionary Biology
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