Ecological Complexity最新文献

Ecological and environmental factors influencing exclusion patterns of phytoplankton size classes in lake systems

IF 3.1 3区环境科学与生态学 Q2 ECOLOGY

Ecological Complexity

Pub Date : 2024-12-30 DOI: 10.1016/j.ecocom.2024.101115

Sze-Wing To , Esteban Acevedo-Trejos , Sherwood Lan Smith , Subhendu Chakraborty , Agostino Merico

For decades, ecologists have been intrigued by the paradoxical coexistence of a wide range of phytoplankton types on a seemingly limited number of resources. The interactions between environmental conditions and trade-offs emerging from eco-physiological traits of phytoplankton are typically proposed to explain coexistence. The number of coexisting types over ecological time scales reflects what we call here ‘exclusion patterns’, that is, the temporal removal of certain phytoplankton types due to competition. Despite many observational and mathematical modelling efforts over the last two decades, we still know surprisingly little, in quantitative terms, about how the interplay of nutrient regimes and specific zooplankton grazing strategies affects the exclusion patterns of competing phytoplankton types. Phytoplankton types can be distinguished according to many different traits. Among various morphological traits, phytoplankton cell size is considered one of the most meaningful in explaining crucial eco-physiological processes, including nutrient uptake and zooplankton grazing. Here we use a size-based plankton model to investigate exclusion patterns of phytoplankton size classes over ecological time scales and under varying environmental conditions. We performed numerical experiments under different allometric scaling relationships, different combinations of specialist and generalist grazing strategies, different inorganic nutrient regimes, and different mixing frequencies. We quantified exclusion patterns by using two metrics: (1) coexistence, defined here as the average number of size classes present over the first 30 days of the simulations, and (2) exclusion time scale, defined here as the time required to outcompete 80 % of the size classes present in the system at the beginning of the simulations. Under low nutrient regimes, we found that the impact of grazing on the exclusion patterns of phytoplankton was almost negligible. Under high nutrient regimes, different exclusion patterns emerged depending on the grazing strategy. When the community of zooplankton was dominated by generalist grazers, we found higher coexistence and longer exclusion time scales of phytoplankton size classes than when the community of zooplankton was dominated by specialist grazers. We further found that the combined effects of grazing strategies and allometric relationships on the size structure of the phytoplankton community were significant and non-trivial. We thus argue that plankton models disregarding these processes may miss relevant drivers of phytoplankton community assembly and trait diversity.

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引用次数: 0

Enhancing maximum sustainable yield in a patchy prey–predator environment 在猎物与食肉动物混杂的环境中提高最大持续产量

IF 3.1 3区环境科学与生态学 Q2 ECOLOGY

Ecological Complexity

Pub Date : 2024-11-06 DOI: 10.1016/j.ecocom.2024.101107

Bilel Elbetch , Ali Moussaoui

In this paper, we investigate a prey–predator community of fish coexisting in a multi-patches model, where different fishing patches are interconnected through migration terms. Only the predator is caught, while the prey grows logistically on each patch. The main objective of our research is to compare the maximum sustainable yield achieved in two contrasting scenarios: unconnected patches and connected patches with rapid stock movements. We show that the total maximum sustainable yield for the connected patches can be greater than the sum of the maximum sustainable yield on each isolated patch. The analysis of the model allows us to establish the conditions under which one of the two cases is more favorable from the viewpoint of yield. As a result, we provide a complete classification for all possible cases. This valuable information can be used to assist decision-makers in selecting the best management strategy for a particular fishery.

在本文中，我们研究了一个在多斑块模型中共存的鱼类捕食者群落，在这个模型中，不同的捕鱼斑块通过洄游条件相互连接。只有捕食者会被捕获，而猎物则在每个渔场上顺理成章地生长。我们研究的主要目的是比较在两种截然不同的情况下实现的最大持续产量：未连接的斑块和种群快速移动的连接斑块。我们的研究表明，连接斑块的总最大持续产量可能大于每个孤立斑块的最大持续产量之和。通过对模型的分析，我们可以确定在哪些条件下，从产量的角度来看这两种情况中的哪一种更有利。因此，我们提供了所有可能情况的完整分类。这些宝贵的信息可用于帮助决策者为特定渔业选择最佳管理策略。

引用次数: 0

A scale-invariant method for quantifying the regularity of environmental spatial patterns 量化环境空间模式规律性的尺度不变方法

IF 3.1 3区环境科学与生态学 Q2 ECOLOGY

Ecological Complexity

Pub Date : 2024-10-30 DOI: 10.1016/j.ecocom.2024.101104

Karl Kästner , Roeland C. van de Vijsel , Daniel Caviedes-Voullième , Christoph Hinz

Spatial patterns of alternating high and low biomass occur in a wide range of ecosystems. Patterns can improve ecosystem productivity and resilience, but the particular effects of patterning depend on their spatial structure. The spatial structure is conventionally classified as either regular, when the patches of biomass are of similar size and are spaced in similar intervals, or irregular. The formation of regular patterns is driven by scale-dependent feedbacks. Models incorporating those feedbacks generate highly regular patterns, while natural patterns appear less regular. This calls for a more nuanced quantification beyond a binary classification. Here, we propose measuring the degree of regularity by the maximum of a pattern’s spectral density, based on the observation that the density of highly regular patterns consists of a narrow and high peak, while the density of highly irregular patterns consists of a low and wide lobe. We rescale the density to make the measure invariant with respect to the characteristic length-scale of a pattern, facilitating the comparison of patterns observed or modelled under different conditions. We demonstrate our method in a metastudy determining the regularity of natural and model-generated patterns depicted in previous studies. We find that natural patterns have an intermediate degree of regularity, resembling random surfaces generated by stochastic processes. We find that conventional deterministic models do not reproduce the intermediate regularity of natural patterns, as they generate patterns which are much more regular and similar to periodic surfaces. We call for appreciating the stochasticity of natural patterns in systems with scale-dependent feedbacks.

生物量高低交替的空间模式出现在多种生态系统中。这种模式可以提高生态系统的生产力和复原力，但模式的特殊效果取决于其空间结构。空间结构通常分为规则和不规则两种，规则是指生物量斑块的大小和间隔相似，不规则是指生物量斑块的大小和间隔相似。规则模式的形成受规模反馈的驱动。包含这些反馈的模型会产生高度规则的模式，而自然模式则不那么规则。这就要求在二元分类法之外进行更细致的量化。根据观察，高度规则模式的密度由一个窄而高的峰值组成，而高度不规则模式的密度由一个低而宽的叶片组成，因此我们建议用模式频谱密度的最大值来衡量规则程度。我们对密度进行了重新标度，使测量结果与图案的特征长度尺度保持不变，从而便于比较在不同条件下观察到的图案或模拟的图案。我们在一项转移研究中演示了我们的方法，该研究确定了以往研究中描述的自然图案和模型生成图案的规律性。我们发现，自然模式具有中等程度的规则性，类似于随机过程生成的随机表面。我们发现，传统的确定性模型并不能再现自然模式的中等规则性，因为它们生成的模式更加规则，类似于周期性表面。我们呼吁在具有规模依赖性反馈的系统中重视自然模式的随机性。

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引用次数: 0

The central importance of the honeybee (Apis mellifera L.) within plant-bee interaction networks decreases along a Neotropical elevational gradient 蜜蜂（Apis mellifera L.）在植物-蜜蜂互动网络中的核心重要性随着新热带海拔梯度而降低

IF 3.1 3区环境科学与生态学 Q2 ECOLOGY

Ecological Complexity

Pub Date : 2024-10-16 DOI: 10.1016/j.ecocom.2024.101105

Carlos Pinilla Cruz , Pedro Luna , Fabricio Villalobos , Roger Guevara , Ismael Hinojoza-Díaz , Wesley Dáttilo

The honeybee Apis mellifera is an introduced managed pollinator species in many world regions and exhibits a high capacity to compete for resources against native bee species. Despite empirical evidence showing that A. mellifera establishes a great number of interactions within plant-bee interaction networks (i.e., high interactive role), little is known on whether its interactive role changes along elevational gradients. Being motivated by these concerns, here we assessed the species richness of plants, bees, interaction diversity, and the interactive role of A. mellifera within plant-bee interaction networks along an elevation gradient from the coastal dunes (4 m.a.s.l.) of the Gulf of Mexico up to the pine-fir forests (3425 m.a.s.l.) in the extinct volcano Cofre de Perote in Mexico. Moreover, we evaluated the interactive role of A. mellifera’s on the diversity of plant-bee interactions along this elevational gradient. We found a decrease in the richness of plants, bees, interaction diversity as elevation increased, and the interactive role of A. mellifera within the networks also decreased with elevation. Moreover, the interactive role of A. mellifera had no effect on the diversity of plant-bee interactions along the studied elevational gradient. These findings indicate that climatic conditions could be filtering plant and bee species and their interactions, even the interactions of a super generalist species as A. mellifera. In short, our study helps understand the responses of species and their biotic interactions over Neotropical elevational gradients. By examining the pronounced climatic shifts, similar to those induced by climate change, we also highlight the sensitivity of these responses to significant environmental alterations. Our findings underscore the critical importance of understanding ecological dynamics in the face of rapidly changing climates.

蜜蜂（Apis mellifera）是世界上许多地区引进的人工授粉物种，与本地蜜蜂物种竞争资源的能力很强。尽管经验证据表明，蜜蜂在植物-蜜蜂互动网络中建立了大量互动关系（即高互动作用），但人们对蜜蜂的互动作用是否会随着海拔梯度的变化而变化知之甚少。出于这些考虑，我们在此评估了从墨西哥湾沿海沙丘（海拔 4 米）到墨西哥 Cofre de Perote 死火山松杉林（海拔 3425 米）的海拔梯度上植物、蜜蜂的物种丰富度、交互多样性以及 A. mellifera 在植物-蜜蜂交互网络中的交互作用。此外，我们还评估了 A. mellifera 在这一海拔梯度上对植物-蜜蜂相互作用多样性的交互作用。我们发现，随着海拔的升高，植物、蜜蜂和互动多样性的丰富程度有所降低，而 A. mellifera 在网络中的互动作用也随着海拔的升高而降低。此外，在所研究的海拔梯度上，A. mellifera的交互作用对植物-蜜蜂交互作用的多样性没有影响。这些发现表明，气候条件可能会过滤植物和蜜蜂物种及其相互作用，甚至是像A. mellifera这样的超级通才物种的相互作用。简而言之，我们的研究有助于了解物种及其生物相互作用在新热带海拔梯度上的反应。通过研究明显的气候转变（类似于气候变化引起的转变），我们还强调了这些反应对重大环境变化的敏感性。我们的研究结果突出表明，面对快速变化的气候，了解生态动态至关重要。

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引用次数: 0

Assessing the ecological complexity and uncertainty of predicting forest ecosystem services under climate change 评估预测气候变化下森林生态系统服务的生态复杂性和不确定性

IF 3.1 3区环境科学与生态学 Q2 ECOLOGY

Ecological Complexity

Pub Date : 2024-10-16 DOI: 10.1016/j.ecocom.2024.101106

Marc Djahangard , Han Zhang , Rasoul Yousefpour

Climate change affects Central European forest ecosystems in different ways and, consequently, these changes result in different feedbacks on the provision of forest ecosystem services. Regarding the complexity and the variability in climate-forest interactions outcome, forest decision makers necessitate reliable information about changes in the forest ecosystem services for planning and adaptation purposes. However, forest productivity predictions incorporate multiple levels of uncertainty that have to be regarded to ensure building realistic expectations in forest decision-making. Besides the chosen forest simulation model, uncertainties come from the climate change data represented by a set of representative concentration pathways (RCP), within the underlying ensemble of global circulation and regional climate models (GCM-RCM), and further in the treatment of the CO₂-fertilization effect. We considered the mentioned uncertainties in a framework on simulating forest growth and water services for two forest sites, a Sessile oak and a Scots pine stand in Rhineland-Palatine, Germany. The framework revealed a high variability in future forest ecosystem services. Particularly, the variability among the selected GCM-RCM models within the same Representative Concentration Pathway (RCP) was higher than the variability among different RCPs (RCP2.6 and RCP8.5 representing the low and high CO₂-emission scenarios, respectively). Sessile oak productivity increased under all scenarios, whereas Scots pine growth declined in the lower end of the RCP8.5 scenario. Water services remained mostly stable at both sites. Moreover, we applied a panel data model to estimate what climate indices caused changes in the forest ecosystem services. We found that Scots pine is more sensitive to a multitude of climate indices, such as temperature changes and Sessile oak showed strong response to the CO₂-fertilization. We propose applying this framework to evaluate forest management options under climate change.

气候变化以不同的方式影响着中欧森林生态系统，因此，这些变化对森林生态系统服务的提供产生了不同的反馈作用。鉴于气候与森林相互作用结果的复杂性和多变性，森林决策者需要获得有关森林生态系统服务变化的可靠信息，以便进行规划和适应。然而，森林生产力预测包含多个层面的不确定性，必须加以考虑，以确保在森林决策中建立现实的预期。除了所选的森林模拟模型外，不确定性还来自于全球环流和区域气候模型（GCM-RCM）基础集合中一组代表性浓度路径（RCP）所代表的气候变化数据，以及对二氧化碳施肥效应的进一步处理。我们在模拟德国莱茵兰-帕拉廷地区的无柄栎和苏格兰松林这两个林地的森林生长和水服务的框架中考虑了上述不确定性。该框架揭示了未来森林生态系统服务的高度可变性。特别是，在同一代表性浓度途径（RCP）中，所选 GCM-RCM 模型之间的变异性高于不同 RCP（RCP2.6 和 RCP8.5，分别代表低和高二氧化碳排放情景）之间的变异性。在所有情景下，无梗橡树的生产力都有所提高，而在 RCP8.5 的低端情景下，苏格兰松树的生长则有所下降。两个地点的水服务基本保持稳定。此外，我们还采用面板数据模型来估算哪些气候指数会导致森林生态系统服务发生变化。我们发现，苏格兰松树对温度变化等多种气候指数更为敏感，而无柄橡树则对二氧化碳施肥表现出强烈的反应。我们建议应用这一框架来评估气候变化下的森林管理方案。

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引用次数: 0

Niche divergence mechanisms of closely related hybridising bird species. Modeling approach based on remote sensing data of forest habitats 近缘杂交鸟类的生态位分化机制。基于森林栖息地遥感数据的建模方法

IF 3.1 3区环境科学与生态学 Q2 ECOLOGY

Ecological Complexity

Pub Date : 2024-10-16 DOI: 10.1016/j.ecocom.2024.101102

Jakub Z. Kosicki

Describing mechanisms that ensure stable co-occurrence of sympatric species is fundamental to understanding the complexity of ecological community dynamics. In this study, the Pied flycatcher and the Collared flycatcher were used as model species for the analysis of co-occurrence patterns of closely related hybridising species that inhabit overlapping forest habitats. I hypothesise that spatial niche partitioning between species emerges as a vital adaptive response to interspecific competition and manifests itself in significant shifts in habitat preferences in syntopic areas but not in the allotopic ones. The study leverages a comprehensive dataset that includes species density in 372 randomly selected 1 km² grid cells across the territory of Poland. The analysis of habitat preferences was performed with linear mixed-effect modeling, whereas a contrast analysis was used to investigate changes in habitat preferences resulting from the presence of a competitor. The findings indicate that both species modify their habitat preferences when transitioning between syntopic and allotopic sites. Remarkably, in regions without competitors, such shifts are significantly less pronounced, as demonstrated by the Pied flycatcher that prefers the same habitats both in allopatric regions and allotopic sites. When these results are compared with other studies on closely related hybridising and non-hybridising species, it turns out that what influences the degree and number of niches subjected to competition is the time that passes from species divergence. This study highlights the imperative need to incorporate co-occurrence parameters of closely related species into niche and species distribution models to enhance their ecological realism.

描述确保同域物种稳定共生的机制是了解生态群落动态复杂性的基础。在本研究中，我们以斑蝇鴷和领蝇鴷为模型物种，分析了栖息在重叠森林生境中的近缘杂交物种的共生模式。我的假设是，物种间的空间生态位分区是对种间竞争的重要适应性反应，表现为在同位区栖息地偏好的显著变化，而在异位区则没有。该研究利用了一个综合数据集，其中包括在波兰境内随机选取的 372 个 1 平方公里网格单元中的物种密度。栖息地偏好分析采用线性混合效应模型，而对比分析则用于研究竞争者的存在导致的栖息地偏好变化。研究结果表明，当在同域和异域之间转换时，这两个物种都会改变其栖息地偏好。值得注意的是，在没有竞争者的地区，这种偏好的改变并不明显，如皮德飞鸟在同域地区和异域地点都偏好相同的栖息地。将这些结果与其他关于密切相关的杂交和非杂交物种的研究结果进行比较后发现，影响竞争壁龛的程度和数量的因素是物种分化所经过的时间。这项研究强调了将近缘物种的共生参数纳入生态位和物种分布模型以提高其生态真实性的迫切需要。

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引用次数: 0

Transitive and intransitive structures in competition-based ecological communities 基于竞争的生态群落中的传递性和非传递性结构

IF 3.1 3区环境科学与生态学 Q2 ECOLOGY

Ecological Complexity

Pub Date : 2024-10-16 DOI: 10.1016/j.ecocom.2024.101103

John Vandermeer

Based on the classical idea that no two species can occupy the same niche, ecological communities are frequently assumed to be structured according to the rules of interspecific competition, based on the intuition provided by the Lotka/Volterra competition equations in two dimensions. It has been noted that when three or more species are involved, the usual tacit assumption that all competition is transitive may be violated. Intransitive loops change some of the emergent principles of the competition-based framework of community structure. Since the intransitivity is oscillatory, the convenient stable equilibrium approach to communities is altered and oscillatory behavior of the system needs to be acknowledged. It is likely that real communities, especially if they are relatively large, will contain one or more intransitive structures, along with normal transitivities. Here we examine some theoretical constructs that emanate from the joint consideration of intransitive and transitive structures co-occurring in an ecological community.

根据 "没有两个物种可以占据相同的生态位 "这一经典观点，生态群落通常被假定为按照种间竞争规则来构建，其依据是二维洛特卡/沃尔特拉竞争方程所提供的直觉。人们注意到，当涉及三个或更多物种时，通常默认的所有竞争都是反式竞争的假设可能会被打破。不传递循环改变了基于竞争的群落结构框架的一些显现原则。由于不传递性是振荡的，因此改变了群落的稳定平衡方法，需要承认系统的振荡行为。现实中的群落，尤其是规模相对较大的群落，很可能包含一个或多个不传递结构，以及正常的传递性。在此，我们将对生态群落中同时存在的非传递性结构和传递性结构进行联合研究，并在此基础上提出一些理论构想。

引用次数: 0

Should the biodiversity bank be a savings bank or a lending bank? 生物多样性银行应该是储蓄银行还是贷款银行？

IF 3.1 3区环境科学与生态学 Q2 ECOLOGY

Ecological Complexity

Pub Date : 2024-10-10 DOI: 10.1016/j.ecocom.2024.101101

Martin Drechsler

Conservation offsets are increasingly used as an instrument for biodiversity conservation on private lands. Since the restoration of degraded land often involves uncertainties and time lags, conservation biologists have recommended that credits in conservation offset schemes be awarded only with the completion of the restoration process (“savings bank”). These arguments, however, ignore that such a scheme design may incur higher economic costs than a design in which credits are already awarded at the initiation of the restoration process (“lending bank”). Here a generic agent-based ecological-economic simulation model is developed to explore the cost-effectiveness of savings and lending banks. The economic model compartment considers spatially heterogeneous and dynamic conservation costs and time preferences in the landowners. The ecological compartment considers uncertainty in the duration and the success of restoration process, and in the metapopulation dynamics of a species described by the rates of local population extinction and the colonisation of empty habitat patches. By this the widely used offset metric of “habitat hectares” is replaced by “metapopulation viability” which is commonly used in conservation biology. It turns out that whether credits should be awarded at the initiation or with completion of restoration depends on the ecological and economic circumstances. Larger colonisation and extinction rates, e.g., tend to favour the awarding of credits with the initiation of habitat restoration.

保护补偿越来越多地被用作保护私人土地生物多样性的手段。由于退化土地的恢复通常涉及不确定性和时间滞后，保护生物学家建议，保护补偿计划中的信用额度只有在恢复过程完成后才能授予（"储蓄银行"）。然而，这些论点忽视了这样的计划设计可能比在恢复过程开始时就授予信用额度的设计（"贷款银行"）产生更高的经济成本。本文开发了一个基于代理的通用生态经济模拟模型，以探讨储蓄银行和贷款银行的成本效益。经济模型部分考虑了空间异质性和动态保护成本以及土地所有者的时间偏好。生态部分考虑了恢复过程的持续时间和成功率的不确定性，以及由当地种群灭绝率和空旷栖息地定植率描述的物种元种群动态。因此，广泛使用的 "栖息地公顷数 "抵消指标被保护生物学中常用的 "元种群活力 "所取代。事实证明，是在恢复开始时还是在恢复完成时给予补偿，取决于生态和经济情况。例如，较高的殖民化率和灭绝率倾向于在开始恢复生境时授予信用点。

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引用次数: 0

Systematic effects of environmental factors and phenology on forest structure: Tracking the ecological processes 环境因素和物候对森林结构的系统影响：追踪生态过程

IF 3.1 3区环境科学与生态学 Q2 ECOLOGY

Ecological Complexity

Pub Date : 2024-08-01 DOI: 10.1016/j.ecocom.2024.101093

Manas R. Mohanta , H.S. Suresh , Sudam C. Sahu

Numerous studies have demonstrated the significance of climatic and edaphic conditions in regulating the species composition and forest structure. However, there is still a lack of knowledge regarding the ecological processes that are brought about by phenological expression and regeneration. This study postulates that phenology, regeneration, and species dominance are a sequence of intermediary processes through which environmental conditions affect forest structure. In a dry deciduous forest of Similipal Biosphere Reserve (SBR), India, we analysed the relationships between various environmental characteristics, phenological parameters, seedling density, sapling density, and tree density using Structural Equation Modelling (SEM). The study revealed an immediate association between climate and leafing (Path Coefficient: -0.67; T: 9.374; p < 0.01), flowering (Path Coefficient: -0.61; T: 2.981; p < 0.01), and fruiting (Path Coefficient: -0.67; T: 3.51; p < 0.01). The sequential association between seedling and sapling density and forest structure was also significant (p < 0.5). However, these were found to have no direct link with phenology (T < 1; p > 0.05) which has been assumed to be the outcome of anthropogenic activities in the forest having an impact on the system. Comparatively, synchrony of fruit senescence and synchrony of flowering were the principal events that supported regeneration more than others, each accounting for 79 % and 74 % of their data, respectively. On the other hand, the monthly minimum temperature (contributing 97 % of data) was a key contribution to the principal component (PC1) and was primarily responsible for triggering the phenological cycle. Most of the important phenophases were seasonal (Rayleigh's Z varied from 10.93 to 50.01; p < 0.01) except the fruit initiation (Rayleigh's Z = 0.48; p = 0.2). Most of the species (72 % of all species) had regeneration densities that were corresponding to their competitive scores. Similarly, density of adult tree species proportionated with their density in regeneration stage (sapling and seedling), supporting the research hypothesis. However, several deviant species suggested that the system was affected by a wide range of other factors. This is the first study of its kind to evaluate the critical ecological processes together, and recommends further investigation across different woodland ecosystems to deepen understanding of forest functioning.

大量研究表明，气候和土壤条件在调节物种组成和森林结构方面具有重要意义。然而，人们对物候表现和再生所带来的生态过程仍然缺乏了解。本研究假设物候、再生和物种优势是环境条件影响森林结构的一系列中间过程。在印度西比利帕尔生物圈保护区（SBR）的一片干燥落叶林中，我们利用结构方程模型（SEM）分析了各种环境特征、物候参数、幼苗密度、树苗密度和树木密度之间的关系。研究表明，气候与落叶（路径系数：-0.67；T：9.374；< 0.01）、开花（路径系数：-0.61；T：2.981；< 0.01）和结果（路径系数：-0.67；T：3.51；< 0.01）之间存在直接联系。幼苗和树苗密度与森林结构之间的序列关联也很显著（< 0.5）。然而，这些因素与物候没有直接联系（< 1; > 0.05），这被认为是森林中的人为活动对系统产生影响的结果。相比之下，果实衰老的同步性和开花的同步性是支持再生的主要事件，分别占其数据的 79% 和 74%。另一方面，月最低气温（占数据的 97%）是主成分（PC1）的主要成分，也是引发物候周期的主要原因。大多数重要物候期都是季节性的（雷利氏 Z 从 10.93 到 50.01 不等；< 0.01），但果实开始期除外（雷利氏 = 0.48；= 0.2）。大多数树种（占所有树种的 72%）的再生密度与其竞争性得分相对应。同样，成年树种的密度与其再生阶段（树苗和幼苗）的密度成正比，支持了研究假设。然而，一些偏离的树种表明，该系统受到其他多种因素的影响。这是首次对关键生态过程进行综合评估的同类研究，建议在不同林地生态系统中开展进一步调查，以加深对森林功能的理解。

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引用次数: 0

Analysis of keystone species in a quantitative network perspective based on stable isotopes 基于稳定同位素的定量网络视角分析关键物种

IF 3.1 3区环境科学与生态学 Q2 ECOLOGY

Ecological Complexity

Pub Date : 2024-07-11 DOI: 10.1016/j.ecocom.2024.101092

Ruijing Yang , Minquan Feng , Zimeng Liu , Xuyan Wang , Zili Qu

The analysis of keystone species based on network structure has increasingly emphasized the significance of quantitative food webs. In this study, Zhangze Lake was chosen as the research subject, and assigned a weighted index to each index by creatively combined isotope techniques with topological important and uniqueness theories, then united centrality theory. Next, various scales of indices were used to examine the importance of each nutrient in the food web, the correlation between the ordering and distribution across indices, and the difference in time. This study revealed that the centrality of phytoplankton was significantly higher in April compared to July. Both of the monthly unique species in this ecosystem were planktivorous feeders, while the keystone species serving as higher consumers were identified to be Exopalaemon modestus. The ranking results of the indices other than the weighted closeness centrality and weighted betweenness centrality showed consistency. Additionally, the distributions of the weighted indices differed significantly from their corresponding unweighted indices, with the weighted centrality indices being more similar to the out-degree ordering and more strongly correlated in April. When only strong interactions between species were considered, there was a negative correlation found between species centrality and uniqueness. Through the quantitative construction of a diet proportion food web model, combined with multiple indices, we have provided a practical solution for holistically and quantitatively identifying key species, thus aiding in the accurate and effective protection of biodiversity.

基于网络结构的关键物种分析越来越强调定量食物网的意义。本研究选择漳泽湖为研究对象，通过创造性地将同位素技术与拓扑重要理论、唯一性理论相结合，再结合中心性理论，对各项指标赋予加权指数。接着，利用不同尺度的指数来考察各营养元素在食物网中的重要性、各指数排序与分布的相关性以及时间上的差异。这项研究显示，浮游植物的中心度在四月明显高于七月。该生态系统中的两个月度特有物种均为浮游动物，而作为高级消费者的基石物种被确定为 Exopalaemon modestus。除加权亲近中心度和加权间度中心度外，其他指数的排序结果显示出一致性。此外，加权指数的分布与相应的非加权指数有显著差异，加权中心度指数与外度排序更相似，在四月的相关性更强。如果只考虑物种间的强相互作用，则发现物种中心度与独特性之间存在负相关。通过定量构建食物比例食物网模型，并结合多种指数，我们为全面、定量地识别关键物种提供了一个实用的解决方案，从而有助于准确、有效地保护生物多样性。

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引用次数: 0