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A meta‐analysis of the effects of climate change‐related abiotic factors on aboveground and belowground plant‐associated microbes 与气候变化有关的非生物因素对地上和地下植物相关微生物影响的荟萃分析
IF 3.4 2区 环境科学与生态学 Q1 Agricultural and Biological Sciences Pub Date : 2024-04-08 DOI: 10.1111/oik.10411
Gabriela Quiroga, Bastien Castagneyrol, Luis Abdala‐Roberts, Xoaquín Moreira
The abiotic environment exerts strong effects on plant‐associated microbes, shaping their interactions with plants and resulting ecosystem processes. However, these abiotic effects on plant–microbe interactions are often highly specific and contingent on the abiotic driver or microbial group, requiring synthesis work describing general patterns and from this generate hypotheses and guide mechanistic work. To address this, we conducted a meta‐analysis of the effects of climate change‐related abiotic factors, namely warming, drought, and eCO2, on plant‐associated microbes distinguishing by microbial taxonomic or biological group (bacteria, fungi or virus) and the plant part where microbes are found or associated with (phyllosphere or rhizosphere). We found abiotic driver‐specific patterns, whereby drought significantly reduced microbial abundance, whereas warming and eCO2 had no significant effects. In addition, these abiotic effects were contingent on the microbial taxonomic group, with fungi being negatively affected by drought but positively affected by warming (eCO2 enrichment had no effect), whereas bacteria and viruses were not significantly affected by any factor. Likewise, rhizospheric microbes were negatively affected by drought but positively affected by warming (eCO2 enrichment had no effect), whereas phyllospheric microbes were not significantly affected by any factor. Collectively, these findings point to important implications for global change research by highlighting contrasting effects of climate change‐related abiotic drivers on plant‐associated microbes and the contingency of such effects on microbe life histories and the nature of their interactions with plants.
非生物环境对与植物相关的微生物有很大影响,决定了它们与植物的相互作用以及由此产生的生态系统过程。然而,这些非生物环境对植物与微生物相互作用的影响往往非常具体,而且取决于非生物环境的驱动因素或微生物群,因此需要开展综合工作,描述一般模式,并由此提出假设和指导机理研究工作。为了解决这个问题,我们对与气候变化相关的非生物因素(即变暖、干旱和二氧化碳)对植物相关微生物的影响进行了荟萃分析,按照微生物分类学或生物类群(细菌、真菌或病毒)以及发现微生物或与微生物相关的植物部位(叶球层或根瘤层)进行了区分。我们发现了非生物驱动因素的特定模式,其中干旱显著降低了微生物丰度,而气候变暖和二氧化碳排放则没有显著影响。此外,这些非生物影响取决于微生物分类群,真菌受干旱的负面影响,但受气候变暖的正面影响(eCO2 富集无影响),而细菌和病毒则不受任何因素的显著影响。同样,根瘤层微生物受干旱的负面影响,但受气候变暖的正面影响(eCO2 富集无影响),而植被层微生物受任何因素的影响都不明显。总之,这些发现通过强调与气候变化相关的非生物驱动因素对植物相关微生物的不同影响,以及这些影响对微生物生活史及其与植物相互作用性质的偶然性,对全球变化研究具有重要意义。
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引用次数: 0
Microhabitat humidity rather than food availability drives thermo‐hydroregulation responses to drought in a lizard 微生境湿度而非食物供应驱动蜥蜴对干旱的体温-水调节反应
IF 3.4 2区 环境科学与生态学 Q1 Agricultural and Biological Sciences Pub Date : 2024-04-05 DOI: 10.1111/oik.10535
Théo Bodineau, Chloé Chabaud, Beatriz Decencière, Simon Agostini, Olivier Lourdais, Sandrine Meylan, Jean‐François Le Galliard
The regulation of energy, water and thermal balance involves integrated processes that should drive ecological responses of ectotherms to climate change. Functional tradeoffs between thermoregulation and hydroregulation are exacerbated during hot or dry spells, but how microhabitat hydric properties and trophic resource availability influence these tradeoffs remains unknown. Here, we investigated the effects of microhabitat humidity and food availability on thermo‐hydroregulation strategies in the ground‐dwelling common lizard Zootoca vivipara during a simulated hot and dry spell event. We exposed lizards to a five‐day long acute water restriction in hot conditions in the laboratory and manipulated hydric quality of the retreat site (wet or dry shelter) as well as food availability (ad libitum food or food deprivation). Water restriction and food deprivation caused physiological responses such as muscle catabolism and mobilization of caudal energy reserves. Lizards also developed behavioural strategies to conserve water or energy via decreased thermoregulation effort, higher shelter use and increased eye closure behaviours through time. These physiological and behavioural changes were importantly buffered by the presence of a wet shelter but not by food availability. A wet retreat site reduced the behavioural conflicts between thermoregulation and hydroregulation, allowed lizards to maintain a better condition and reduced physiological dehydration. Instead, food intake did not play a major role in the regulation of hydration state and increased behavioural conflicts between thermoregulation and hydroregulation. A better consideration of thermo‐hydroregulation behaviours and microhabitat hydric quality is required to address ectotherm responses to future climate change.
能量、水和热平衡的调节涉及综合过程,这些过程应推动外温动物对气候变化的生态响应。热调节和水调节之间的功能权衡在炎热或干旱时会加剧,但微生境的水文特性和营养资源的可用性如何影响这些权衡仍是未知数。在这里,我们研究了在模拟的炎热和干旱天气条件下,微生境湿度和食物供应对地栖普通蜥蜴Zootoca vivipara的热-水调节策略的影响。我们在实验室的高温条件下对蜥蜴进行了长达五天的急性限水,并操纵了退避场所的水质(潮湿或干燥的庇护所)以及食物供应(自由进食或剥夺食物)。限水和断食导致了生理反应,如肌肉分解和尾部能量储备的动员。随着时间的推移,蜥蜴还发展出了通过减少体温调节努力、更多地使用庇护所和增加闭眼行为来节约用水或能量的行为策略。这些生理和行为变化的重要缓冲因素是潮湿的庇护所,而不是食物供应。潮湿的避难所减少了体温调节和水调节之间的行为冲突,使蜥蜴能够保持更好的状态,并减少生理脱水。相反,食物摄入在调节水合状态方面没有发挥主要作用,反而增加了体温调节和水合调节之间的行为冲突。要解决外温动物对未来气候变化的反应问题,需要更好地考虑体温-水调节行为和微生境水质。
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引用次数: 0
Multilayer diffusion networks as a tool to assess the structure and functioning of fine grain sub‐specific plant–pollinator networks 以多层扩散网络为工具,评估细粒亚特异性植物授粉者网络的结构和功能
IF 3.4 2区 环境科学与生态学 Q1 Agricultural and Biological Sciences Pub Date : 2024-04-05 DOI: 10.1111/oik.10168
Alfonso Allen‐Perkins, María Hurtado, David García‐Callejas, Oscar Godoy, Ignasi Bartomeus
Interaction networks are a widely used tool to understand the dynamics of plant–pollinator ecological communities. However, while most mutualistic networks have been defined at the species level, ecological processes such as pollination take place at different scales, including the individual or patch levels. Yet, current approaches studying fine‐grain sub‐specific plant–pollinator networks only account for interactions among nodes belonging to a single plant species due to the conceptual and mathematical limitations of modeling simultaneously several plant species each composed of several nodes. Here, we introduce a multilayer diffusion network framework that allows modeling simple diffusion processes between nodes pertaining to the same or different layers (i.e. species). It is designed to depict from the network structure the potential conspecific and heterospecific pollen flows among plant individuals or patches. This potential pollen flow is modeled as a transport‐like system, in which pollen grain movements are represented as random‐walkers that diffuse on an ensemble of bipartite layers of conspecific plants and their shared pollinators. We exemplify this physical conceptualization using a dataset of nine fine‐grain sub‐specific plant–pollinator networks from a Mediterranean grassland of annual plants, where plant nodes represent groups of conspecifics within patches of 1 m2. The diffusion networks show pollinators effectively connecting sets of patches of the same and different plant species, forming a modular structure. Interestingly, different properties of the network structure, such as the conspecific pollen arrival probability and the number of conspecific subgraphs in which plants are embedded, are critical for the seed production of different plant species. We provide a simple but robust set of metrics to calculate potential pollen flow and scale down network ecology to functioning properties at the individual or patch level, where most ecological processes take place, hence moving forward the description and interpretation of species‐rich communities across scales.
交互网络是了解植物-传粉昆虫生态群落动态的一种广泛应用的工具。然而,虽然大多数互作网络都是在物种水平上定义的,但授粉等生态过程发生在不同的尺度上,包括个体或斑块水平。然而,由于同时模拟由多个节点组成的多个植物物种在概念和数学上的局限性,目前研究细粒度亚特异性植物-传粉昆虫网络的方法只考虑了属于单一植物物种的节点之间的相互作用。在此,我们介绍一种多层扩散网络框架,该框架可模拟同层或不同层(即物种)节点之间的简单扩散过程。它旨在通过网络结构描述植物个体或斑块之间潜在的同种和异种花粉流。这种潜在的花粉流被模拟为一个类似运输的系统,其中花粉粒的运动被表示为随机行走,在由同种植物及其共同授粉者组成的双方格层集合上扩散。我们利用地中海草地一年生植物的九个细粒度亚特异性植物-传粉者网络数据集对这一物理概念进行了举例说明,其中植物节点代表 1 平方米斑块内的同种植物群。扩散网络显示,授粉者有效地连接了相同和不同植物物种的斑块集,形成了一种模块化结构。有趣的是,网络结构的不同属性,如同种植物花粉到达概率和植物嵌入的同种植物子图数量,对不同植物物种的种子生产至关重要。我们提供了一套简单而稳健的指标来计算潜在的花粉流,并将网络生态学缩小到个体或斑块层面的功能特性,而大多数生态过程都是在个体或斑块层面进行的,从而推进了跨尺度物种丰富群落的描述和解释。
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引用次数: 0
Intraguild interactions and abiotic conditions mediate occupancy of mammalian carnivores: co‐occurrence of coyotes–fishers–martens 哺乳类食肉动物的群落内相互作用和非生物条件:郊狼-渔夫-马腾斯的共同出现
IF 3.4 2区 环境科学与生态学 Q1 Agricultural and Biological Sciences Pub Date : 2024-03-20 DOI: 10.1111/oik.10577
Joshua P. Twining, Jennifer L. Brazeal, Paul G. Jensen, Angela K. Fuller
The widespread eradication of large carnivores and subsequent expansion of top mesopredators has the potential to impact species and community interactions with ecosystem‐wide implications. An example of these trophic dynamics is the widespread establishment of coyotes following extirpation of wolves and mountain lions in eastern North America. Here, we examined occupancy of three carnivores in northern New York considering both environmental/habitat factors and interspecific interactions. We estimated the co‐occurrence of coyotes, fishers, and martens from a landscape‐scale winter camera trap survey repeated annually for three years. Martens occurred independently of both coyotes and fishers, while fishers and coyotes displayed positive intraguild interactions that were constant across the landscape. Both marten and fisher first‐order occupancy were driven by a combination of biotic and abiotic factors, with both species displaying positive associations with forest cover but antithetical responses to average snow depth. The integral and antithetical role of snow depth in driving the occurrence of martens (positive) and fishers (negative) in the landscape indicates that future climatic warming could reduce the availability of current spatial refuges for martens created by severe winter conditions. Climate‐driven alterations to established competitive interactions and co‐existence patterns between marten and fisher have critical implications for the species survival and conservation. We provide correlational evidence consistent with the potential for positive top‐down effects of dominant mesocarnivores on subordinate species, with fisher occupancy increasing conditional on the presence of coyotes across the landscape. These findings align with the hypothesis that under certain conditions, coyotes may facilitate certain subordinate carnivores. The evidence produced here is consistent with hypotheses on the dynamic nature of trophic niches. We demonstrate the need to consider the interplay between climate, habitat, and interspecific interactions to understand wildlife occupancy patterns and inform wildlife management in a rapidly changing world.
大型食肉动物的广泛灭绝和随后顶级中型食肉动物的扩张有可能影响物种和群落的相互作用,并对整个生态系统产生影响。北美东部狼和山狮灭绝后郊狼的广泛出现就是这些营养动态的一个例子。在这里,我们考虑了环境/栖息地因素和种间相互作用,研究了纽约北部三种食肉动物的占据情况。通过连续三年每年重复进行的景观尺度冬季相机陷阱调查,我们估算出郊狼、鱼凫和貂的共同出现率。貂的出现独立于郊狼和鱼鹰,而鱼鹰和郊狼在整个景观范围内都表现出了积极的群内相互作用。貂和鱼的一阶占有率都是由生物因素和非生物因素共同驱动的,两个物种都与森林覆盖率呈正相关,但对平均积雪深度的反应却相反。积雪深度在地貌中驱动貂(正向)和鱼类(负向)出现的不可分割的反向作用表明,未来气候变暖可能会减少严冬条件下貂目前的空间庇护所的可用性。气候驱动的貂与鱼之间既有的竞争互动和共存模式的改变对物种的生存和保护具有重要影响。我们提供的相关证据表明,优势中型食肉动物可能会对从属物种产生自上而下的积极影响,在整个地形中狼的存在条件下,鱼类的占有率会增加。这些发现与郊狼在某些条件下可能会促进某些从属食肉动物的假设一致。这里的证据与营养龛动态性质的假说是一致的。我们的研究表明,有必要考虑气候、栖息地和种间相互作用之间的相互影响,以了解野生动物的栖息模式,并在瞬息万变的世界中为野生动物管理提供信息。
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引用次数: 0
Species gain and loss per degree Celsius 每摄氏度的物种增减
IF 3.4 2区 环境科学与生态学 Q1 Agricultural and Biological Sciences Pub Date : 2024-03-13 DOI: 10.1111/oik.10556
Mark Westoby, Samuel C. Andrew, Rachael V. Gallagher, Julian Schrader
With climate zones moving poleward, it is interesting to know how rapidly species are gained and lost along temperature gradients. For the Australian native vascular flora, observed climate envelopes for species distributions have here been calculated from data for occurrence at geographical locations. For each degree temperature increase along a continental temperature gradient, numbers of species crossing their cold boundary and hence added to the flora, and crossing their warm boundary and hence lost to the flora, were counted. These counts of gains and losses were expressed as percentages of the flora recorded as present at that temperature. We report results for the flora at > 700 mm rainfall pa along the Australian east coast, where higher rainfall is continuously distributed throughout the latitudinal range. Per °C mean annual temperature increase, 20 ± 11% (mean ± SD) of species were gained, and 14 ± 4% were lost, across the range 9–23°C. Many further questions arise. For example, which other continental floras might show faster or slower rates of species gain and loss along temperature gradients? Similarly, might species with particular traits show faster rates of turnover: for example, species with local dispersal such as those with diaspore morphologies adapted for ants, compared to those adapted for bird dispersal?
随着气候带向极地移动,了解物种在温度梯度上的增减速度很有意义。对于澳大利亚本地维管植物区系,我们根据地理位置的物种出现数据计算出了物种分布的观测气候包络线。在大陆温度梯度上,温度每升高一度,就会计算越过其寒冷边界从而增加植物区系的物种数量,以及越过其温暖边界从而失去植物区系的物种数量。这些增加和减少的物种数量用占该温度下植物群的百分比来表示。我们报告了澳大利亚东海岸降雨量为 700 毫米的植物区系的结果,该地区较高的降雨量在整个纬度范围内持续分布。年平均气温每升高一摄氏度,在 9-23 摄氏度的范围内,物种增加了 20 ± 11%(平均 ± SD),物种减少了 14 ± 4%。由此还产生了许多问题。例如,在温度梯度上,哪些其他大陆植物区系的物种增减速度可能更快或更慢?同样,具有特殊性状的物种是否会表现出更快的更替率:例如,具有本地传播性的物种,如具有适应蚂蚁的二孢形态的物种,与适应鸟类传播的物种相比,是否会表现出更快的更替率?
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引用次数: 0
Litter consumption by macrodetritivores depends more on mechanical than on nutritional constraints 大型食肉动物的粪便消耗更多取决于机械而非营养限制因素
IF 3.4 2区 环境科学与生态学 Q1 Agricultural and Biological Sciences Pub Date : 2024-03-13 DOI: 10.1111/oik.10280
Théo Marchand, Lola Estabes, Benjamin Pey
Ecosystem functions greatly depend on trophic interactions between consumers and their resources. Resource consumption depends on ingestion, digestion, and allocation processes. Mechanical constraints are expected to influence ingestion, while metabolic and nutritional constraints are expected to influence allocation. Leaf litter are resources presenting a high mechanical and nutritional heterogeneity that depends on plant identity and on physical and microbial processing over the course of decomposition. Litter consumption by detritivores is known to depend on metabolic and nutritional constraints but the importance of mechanical constraints is yet unknown. After accounting for metabolic constraints on consumption rate, we tested the relative importance of mechanical and nutritional constraints in explaining litter consumption rates by detritivores. For this, we exposed 16 leaf treatments (eight leaf species either just leached or leached and microbially conditioned) to four aquatic and five terrestrial detritivore taxa in laboratory no‐choice consumption experiments. We investigated two mechanical constraints: grabbing and fragmenting the resource, by measuring suitable couples of mechanical traits for both litter and detritivores. We also investigated four nutritional constraints related to N, P, K and Ca contents in both detritivores and litter. For each constraint, we also tested if trait matching significantly contribute to explain consumption. Our analysis revealed that both mechanical and nutritional constraints are influencing mass‐independent consumption rate but that mechanical constraints predominate over nutritional constraints. Litter fragmentation, studied through litter toughness and detritivore biting force, was especially important to explain consumption rate. Nutritional constraints were dominated by P constraints. Trait‐matching had very weak importance and was significant only for P constraints. Our findings highlight the importance of mechanical constraints for litter consumption by detritivores.
生态系统的功能在很大程度上取决于消费者与其资源之间的营养相互作用。资源消耗取决于摄取、消化和分配过程。机械限制会影响摄取,而代谢和营养限制则会影响分配。落叶是一种具有高度机械和营养异质性的资源,取决于植物特性以及分解过程中的物理和微生物处理过程。已知食腐动物对落叶的消耗取决于代谢和营养限制,但机械限制的重要性尚不清楚。在考虑了新陈代谢对消耗率的限制后,我们测试了机械和营养限制在解释食腐动物对垃圾的消耗率方面的相对重要性。为此,我们在实验室无选择消耗实验中将16种叶片处理(8种叶片,有的刚刚浸出,有的浸出后经微生物调节)暴露给4种水生和5种陆生食腐动物类群。我们研究了两种机械限制因素:攫取资源和资源破碎,方法是测量枯落物和食腐动物的机械特征的合适耦合。我们还研究了四种营养制约因素,分别与食腐动物和垃圾中的氮、磷、钾和钙含量有关。对于每种限制因素,我们还测试了性状匹配是否对解释消耗量有显著作用。我们的分析表明,机械和营养限制因素都会影响与质量无关的消耗率,但机械限制因素比营养限制因素更重要。通过垃圾的韧性和食腐动物的咬合力来研究垃圾的破碎程度对解释消耗率尤为重要。营养限制主要是P限制。性状匹配的重要性很弱,仅对P约束有显著影响。我们的研究结果凸显了机械约束对食腐动物消耗垃圾的重要性。
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引用次数: 0
Intertidal mussels as ecosystem engineers: maintenance of invertebrate assemblages amid intertidal stress gradients 作为生态系统工程师的潮间带贻贝:潮间带压力梯度中无脊椎动物群的维持
IF 3.4 2区 环境科学与生态学 Q1 Agricultural and Biological Sciences Pub Date : 2024-03-13 DOI: 10.1111/oik.10304
David Bogdanski, Lorena Marcos‐Almansa, Augusto A. V. Flores
Species that form complex biogenic structures may increase niche space for many others and are assumed to be paramount for whole‐assemblage stability and ecosystem functioning. Because they often ameliorate physical conditions, ecosystem engineering species are also predicted to become more important with environmental stress. Testing this hypothesis, however, has proven difficult because isolating facilitation effects along the entire stress gradient is challenging. Here we addressed motile invertebrate assemblages associated to the mid‐intertidal chthamalid barnacle cover at four rocky shores, either with (‘facilitated') or without (‘control') a secondary natural cover of small mussels (Mytilaster solisianus and Brachidontes darwinianus). Following a factorial balanced design, replicate samples were taken at three tidal heights in all sites, encompassing a clear gradient of thermal stress and desiccation potential along the vertical range of the mussel‐enriched zone. While observations on general abundance were mostly consistent with stress‐independent facilitation, results for richness, diversity and assemblage structure indicated overarching stress‐dependent responses. All these later three response variables steadily declined from the low to the high level in the control barnacle habitat but remained unaltered in the mussel‐facilitated habitat. Increased facilitation higher on the shore is mostly due to retention of stress‐vulnerable groups such as polychaetes, flatworms and large nematodes which virtually collapse in the higher control habitat, further indicating that mechanisms of mussel facilitation involve relief of environmental stress rather than protection from higher‐order consumers. Our results suggest that mussel ecosystem engineering was fully preserved during the summer season when sampling took place. Ongoing research simulating heat waves compatible to climate‐change scenarios will test whether mussel facilitation would hold over the coming decades.
形成复杂生物结构的物种可能会增加许多其他物种的生态位空间,并被认为对整个生物群的稳定性和生态系统的功能至关重要。由于生态系统工程物种通常能改善物理条件,因此预计它们在环境压力下也会变得更加重要。然而,要验证这一假说却很困难,因为要在整个压力梯度上分离出促进效应具有挑战性。在这里,我们研究了与四个岩石海岸中潮间带藤壶覆盖物相关的活动无脊椎动物群,这些覆盖物要么有("促进")要么没有("控制")小贻贝(Mytilaster solisianus 和 Brachidontes darwinianus)的次生自然覆盖物。按照因子平衡设计,在所有地点的三个潮汐高度进行了重复取样,沿贻贝富集区的垂直范围,热应力和干燥潜能梯度明显。虽然对一般丰度的观察结果大多与独立于压力的促进作用相一致,但对丰富度、多样性和集合结构的观察结果表明,总体上存在依赖压力的反应。在对照藤壶栖息地,后三个反应变量都从低水平向高水平稳步下降,但在贻贝促进的栖息地却保持不变。在较高的控制栖息地中,多毛目环节动物、扁形虫和大型线虫等易受压力影响的类群几乎崩溃。我们的研究结果表明,在取样的夏季,贻贝生态系统工程得到了充分保护。正在进行的模拟与气候变化情景相适应的热浪的研究将检验贻贝的促进作用在未来几十年内是否仍然有效。
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引用次数: 0
Polyploidy‐induced floral changes lead to unexpected pollinator behavior in Arabidopsis arenosa 拟南芥多倍体诱导的花朵变化导致了意想不到的授粉者行为
IF 3.4 2区 环境科学与生态学 Q1 Agricultural and Biological Sciences Pub Date : 2024-03-13 DOI: 10.1111/oik.10267
Roswitha Schmickl, Mario Vallejo Marín, Jakub Hojka, Juan Manuel Gorospe, Mohammad Javad Haghighatnia, Ömer İltaş, Adam Kantor, Marek Slovák, Clément Lafon Placette
The paradox between the ubiquity of polyploid lineages in plants and the early obstacles to the establishment of polyploids is a long‐studied yet unresolved question in evolutionary biology. It is assumed that to successfully persist after emergence, newly formed polyploids need to display certain fitness advantages and show a certain extent of reproductive isolation with their diploid progenitors. In this study, we tested whether immediate floral changes following polyploidization can improve pollinator visitation and enable pollinator preference leading to assortative mating, i.e. build a premating reproductive barrier between diploids and polyploids. For this purpose, we generated synthetic tetraploids of Arabidopsis arenosa and measured insect visitor behavior on diploids and synthetic tetraploids. We found that the increased floral size that accompanied polyploidization did not lead to a measurable increase in visitor preference, with insects visiting diploid and tetraploid plants at equal frequency. Despite this observation, tetraploids set more fruits than diploids, suggesting a positive impact of polyploidization on pollen transfer via other means. In addition, polyploidization did not lead to assortative mating but instead promoted interploidy pollen exchange, since visitors preferentially switched between cytotypes rather than preferring one. Consistent with this switching behavior, most of the progeny from tetraploid plants were triploid. Our data suggest that polyploidization has an immediate impact on mating in plants, but in a more complex way than has been assumed previously.
植物中多倍体系的普遍性与多倍体建立的早期障碍之间的矛盾是进化生物学中一个研究已久但尚未解决的问题。据推测,新形成的多倍体要想在出现后成功存活,需要显示出一定的适应性优势,并与其二倍体祖先表现出一定程度的生殖隔离。在本研究中,我们测试了多倍体化后花朵的直接变化是否能改善授粉者的访问量并实现授粉者的偏好,从而导致同类交配,即在二倍体和多倍体之间建立起一个交配前的生殖屏障。为此,我们生成了拟南芥的合成四倍体,并测量了昆虫在二倍体和合成四倍体上的访粉行为。我们发现,伴随多倍体化而增加的花朵大小并没有导致访客偏好的显著增加,昆虫访问二倍体和四倍体植物的频率相同。尽管如此,四倍体还是比二倍体结出了更多的果实,这表明多倍体化对通过其他途径传递花粉产生了积极影响。此外,多倍体化并没有导致同种交配,反而促进了不同倍性之间的花粉交换,因为来访者更喜欢在细胞型之间切换,而不是偏爱其中一种。与这种交换行为相一致的是,四倍体植株的大部分后代都是三倍体。我们的数据表明,多倍体化会对植物的交配产生直接影响,但其影响方式比之前假设的更为复杂。
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引用次数: 0
Plant, insect, and soil microbial communities vary across brome invasion gradients in northern mixed‐grass prairies 北方杂草草原中植物、昆虫和土壤微生物群落在锦鸡儿入侵梯度上的差异
IF 3.4 2区 环境科学与生态学 Q1 Agricultural and Biological Sciences Pub Date : 2024-03-08 DOI: 10.1111/oik.10515
Morgan D. T. Frost, Kimberly J. Komatsu, Lauren M. Porensky, Kurt O. Reinhart, Kevin R. Wilcox, Zachary L. T. Bunch, Ashley D. Jolin, Katielyn A. Johnston, Gracen E. Trimas, Sally E. Koerner
Species interactions shape native plant communities, influencing both composition and ecosystem processes, with invasion by non‐native species threatening these dynamic relationships, native species, and function. The consequences of invasive plants in particular may stretch across taxa to impact plant, insect, and soil microbial communities directly and indirectly, with consequences for ecological functioning. In northern mixed‐grass prairies in the United States, invasion by two annual brome grasses, Bromus arvensis and B. tectorum, negatively impacts rangeland plants; however, the simultaneous effects on insects and soil microbes (bacteria and archaea), and the implications for ecological function, have received less attention. Here, using observational field studies conducted at two mixed‐grass prairie sites in Montana and Wyoming, we assessed the relationships between plants, insects, and soil microbes across gradients of invasion by B. arvensis and B. tectorum. Overall, we found differences in plant and insect communities and functional groups with increasing invasion abundance for both brome species. However, associations between invasion and the soil microbial community were species specific, as we only saw these relationships under B. tectorum invasion, implying B. tectorum may have more substantial consequences for rangeland management. While invasion by annual bromes may cause changes in certain plant and insect functional groups, such as C4 perennial grasses and certain insect herbivores, soil microbial functional groups may be less impacted, especially under B. arvensis invasion. This work sheds light on the need to explore changes in natural communities across taxa and to all invasive species, as ecosystem effects are likely to be contingent upon both.
物种间的相互作用塑造了本地植物群落,影响着其组成和生态系统过程,而非本地物种的入侵则威胁着这些动态关系、本地物种和功能。特别是入侵植物的后果可能会延伸到各个类群,直接或间接地影响植物、昆虫和土壤微生物群落,从而对生态功能造成影响。在美国北部混合草草原,两种一年生锦鸡儿草(Bromus arvensis 和 B. tectorum)的入侵对牧场植物产生了负面影响;然而,同时对昆虫和土壤微生物(细菌和古细菌)产生的影响以及对生态功能的影响却较少受到关注。在这里,我们利用在蒙大拿州和怀俄明州的两个混合草草原地点进行的野外观察研究,评估了在 B. arvensis 和 B. tectorum 入侵梯度上植物、昆虫和土壤微生物之间的关系。总体而言,我们发现随着入侵丰度的增加,这两种锦鸡儿属植物和昆虫群落及功能群之间存在差异。然而,入侵与土壤微生物群落之间的关系是有物种特异性的,因为我们只在 B. tectorum 入侵的情况下看到了这些关系,这意味着 B. tectorum 可能会对牧场管理产生更大的影响。虽然一年生草本植物的入侵可能会导致某些植物和昆虫功能群的变化,如 C4 多年生禾本科植物和某些昆虫食草动物,但土壤微生物功能群受到的影响可能较小,尤其是在 B. arvensis 入侵的情况下。这项研究揭示了探索不同类群的自然群落变化以及所有入侵物种变化的必要性,因为生态系统的影响可能取决于这两方面。
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引用次数: 0
Height growth and biomass partitioning during secondary succession differ among forest light strata and successional guilds in a tropical rainforest 热带雨林中不同森林光层和演替类群在次生演替过程中的高度增长和生物量分配存在差异
IF 3.4 2区 环境科学与生态学 Q1 Agricultural and Biological Sciences Pub Date : 2024-03-08 DOI: 10.1111/oik.10486
Tomonari Matsuo, Frans Bongers, Miguel Martínez-Ramos, Masha T. van der Sande, Lourens Poorter
In closed-canopy systems globally, plants exhibit intense competition for light, prioritizing vertical growth to attain elevated positions within the canopy. Light competition is especially intense in tropical rainforests because of their dense shaded stands, and during forest succession because of concomitant changes in vertical light profiles. We evaluated how the height growth of individual tree differs among forest light strata (canopy, sub-canopy and understorey) and successional guilds (early, mid- and late successional species) during secondary succession in a Mexican rainforest. Fourteen secondary forest stands differing in time since agricultural abandonment (1–25 years) were monitored for seven consecutive years. For each stand and census year we estimated relative light intensity (RLI) for each height and categorized trees into forest light strata: understorey (RLI ≦ 33.3%), sub-canopy (33.3% ≦ RLI ≦ 66.6%) and canopy (RLI ≧ 66.6%), and into successional guilds based on the literature. We estimated two measures of height growth: absolute height growth (HGabs, cm year−1) calculated as the difference in tree height between two consecutive censuses, and biomass partitioning to height growth (HGbp, in kg kg−1 × 100) calculated as the percentage of total aboveground biomass growth partitioned to height growth. Earlier in succession, trees for all strata had greater HGabs and HGbp, resulting in rapid vertical forest development. HGabs was fastest for canopy trees, followed by sub-canopy and understorey trees. These differences in HGabs among strata, combined with their inter-specific variation and continuous recruitment of small individuals, lead to a rapid differentiation in tree sizes and increase stand structural heterogeneity. HGbp was greater for understorey and sub-canopy trees than for canopy trees, reflecting ontogenetic changes in the light competition strategy from growth to persistence. With succession, both HGabs and HGbp decreased, most strongly for canopy trees, probably because of an increased exposure to drought stress. These successional changes stabilize stand size structure and reduce the rate of development.
在全球封闭树冠系统中,植物对光的竞争十分激烈,它们优先考虑垂直生长,以获得树冠内的高处位置。在热带雨林中,由于树冠浓密,光照竞争尤为激烈;在森林演替过程中,由于垂直光照剖面随之发生变化,光照竞争也尤为激烈。我们评估了在墨西哥热带雨林的次生演替过程中,不同森林光层(树冠层、次树冠层和林下层)和演替类群(早、中、晚演替物种)之间单棵树木的高度增长有何差异。我们对 14 个次生林林分进行了连续 7 年的监测,这些林分自农业废弃以来的时间各不相同(1-25 年)。对于每个林分和普查年份,我们估算了每个高度的相对光照强度(RLI),并根据文献将树木划分为森林光照层:林下(RLI ≦ 33.3%)、亚冠层(33.3% ≦ RLI ≦ 66.6%)和冠层(RLI ≧ 66.6%),以及演替区。我们估算了高度增长的两个指标:绝对高度增长(HGabs,cm year-1),计算方法是两次连续普查之间的树高差值;高度增长的生物量分配(HGbp,单位:kg kg-1 ×100),计算方法是高度增长占地上生物量总增长的百分比。在演替早期,各层树木的 HGabs 和 HGbp 都较大,导致森林垂直方向发展迅速。冠层树木的 HGabs 增长最快,其次是亚冠层和林下树木。各层之间的 HGabs 差异,加上其种间差异和小个体的不断吸收,导致树木大小的快速分化,增加了林分结构的异质性。林下和树冠下树木的 HGbp 大于树冠树木,这反映了从生长到持久的光竞争策略的个体发育变化。随着演替的进行,HGabs 和 HGbp 都有所下降,冠层树木的下降幅度最大,这可能是由于受到的干旱胁迫增加了。这些演替变化稳定了林分大小结构,降低了发展速度。
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