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Ontogenetic trait variation and metacommunity effects influence species relative abundances during tree community assembly

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Plant Diversity 2022年第4期44卷 360-368页

作者： Yun-Yun He Kwansupa Srisombut Ding-Liang Xing Nanthan G.Swenson Mengesha Asefa Min Cao Xiao-Yang Song Han-Dong Wen Jie Yang CAS Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMengla666303YunnanChina University of Chinese Academy of Sciences Beijing100049China School of Ecological and Environmental Sciences East China Normal UniversityShanghai200241China Department of Biological Sciences University of Notre DameNotre DameIN46556USA Center of Plant Ecology Core Botanical GardensChinese Academy of SciencesMengla666303YunnanChina

Predicting species abundance is one of the most fundamental pursuits of *** the information encoded in functional traits and metacommunities provides a new perspective to predict the abundance of species in *** applied a community assembly via trait selection model to predict quadrat-scale species abundances using functional trait variation on ontogenetic stages and metacommunity information for over 490 plant species in a subtropical forest and a lowland tropical forest in Yunnan,*** relative importance of trait-based selection,mass effects,and stochasticity in shaping local species abundances is evaluated using different null *** found both mass effects and trait selection contribute to local abundance *** selection was detectable at all studied spatial scales(0.04e1 ha),with its strength stronger at larger scales and in the subtropical *** contrast,the importance of stochasticity decreased with spatial scale.A significant mass effect of the metacommunity was observed at small spatial *** results indicate that tree community assembly is primarily driven by ontogenetic traits and metacommunity *** findings also demonstrate that including ontogenetic trait variation into predictive frameworks allows ecologists to infer ecological mechanisms operating in community assembly at the individual level.

关键词： metacommunity Maximum entropy Ontogenetic trait variation Community assembly Trait-selected process

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The impact of earlier flood recession on metacommunity diversity of wintering waterbirds at shallow lakes in the middle and lower Yangtze River floodplain

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Avian Research 2023年第2期14卷 223-230页

作者： Zhenhua Wei Lizhi Zhou School of Resources and Environmental Engineering Anhui UniversityHefei230601China Anhui Province Key Laboratory of Wetland Ecosystem Protection and Restoration(Anhui University) Hefei230601China Anhui Shengjin Lake Wetland Ecology National Long-term Scientific Research Base Dongzhi247230China

The hydrological regime in wetlands plays an important role in the process of wintering waterbird metacommunity ***,increasing frequency of extreme climate and the intensification of human activities,such as the construction of sluices and dams,have resulted in frequently abnormal hydrological regime in the middle and lower Yangtze River *** recent years,earlier flood recession has become one of the main hydrological problems faced in the shallow lakes,having a great impact on wetland *** is necessary to understand the impact of earlier flood recession on waterbirds,an indicator of wetland biodiversity,and the metacommunity concept is helpful to elucidate the underlying mechanism involved in the processes of assemblage by waterbird *** this study,we surveyed the wintering waterbirds at three sub-lakes of Caizi Lakes during 2019-2020 and 2020-2021 and compared the richness,abundance,alpha and beta diversity of waterbirds in and among local metacommunities under earlier flood recession and normal hydrological *** results showed that the earlier flood recession reduced the species richness in the early stage and abundance in the late stage,it also reduced the Shannon-Wiener index in the early stage and increased the dissimilarity between and within waterbird metacommunities in the late *** partition of beta diversity showed that the turnover component played a major role in the process of waterbird metacommunity *** was found that the earlier flood recession reduced the richness,abundance in different stages of flood recession,which also increased the turnover of *** with high habitat heterogeneity had better resistance to abnormal hydrological regime,which resulted in high dissimilarity between and within *** results of this study provide important information for waterbird conservation and water level management at shallow lakes in the middle and lower Yangtz

关键词： Beta diversity Flood recession Hydrological regime metacommunity Shallow lake Waterbirds

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Spatiotemporal distribution of seasonal bird assemblages on land-bridge islands: linking dynamic and static views of metacommunities

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Avian Research 2019年第3期10卷 250-261页

作者： Chuanwu Chen Marcel Holyoak Yanping Wang Xingfeng Si Ping Ding College of Life Sciences Zhejiang University Hangzhou 310020China Jiangsu Key Laboratory for Biodiversity and Biotechnology College of Life SciencesNanjing Normal University Nanjing 210046China Department of Environmental Science and Policy University of CaliforniaDavisCA 95616USA School of Ecological and Environmental Sciences East China Normal UniversityShanghai 200241China

Background: Although assessing temporal dynamics of populations is crucial for understanding metacommunities, empirical studies have primarily analyzed only static snapshots of communities. Here, we present a holistic view of how species traits and habitat characteristics relate to metacommunity dynamics and use it to test for differences in the spatiotemporal distribution of seasonal bird assemblages. Methods: We surveyed forest birds in breeding and winter seasons within 36 islands for 9 years. We then grouped birds into four landbird assemblages, selected on the basis of published differences in biology or ecology: winter residents, migratory winter visitors, breeding summer residents, and migratory summer visitors. We estimated dynamic species colonization and extirpation through the 9-year period, and evaluated the associations among island attributes, species attributes and community composition. Results: Overall, winter and summer residents showed strong associations between composition and habitat structure of the islands. In addition, winter and summer residents on large islands had lower extirpation and turnover than winter and summer visitors. Visitor assemblages showed no significant habitat associations, and in winter had high extirpation rates and small body sizes. By contrast, local extirpation of summer visitors was correlated with local species richness, indicating a likely effect of competition on extirpation. Conclusions: Our results demonstrated repeated patterns among species composition, bird traits, habitat/island characteristics and observed metacommunity dynamics. Winter and summer residents best matched species sorting and patch dynamics, respectively, due to differences in resource availability and requirements of overwinter survival versus breeding. Summer visitors were consistent with species sorting and winter visitors were randomly distributed, likely because of interactions with resident competitors. Our results highlight that coexist

关键词： Body size Colonization Competition Extirpation Island turnover metacommunity

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β-diversity Patterns of Plant Community in Fragmented Habitat in a Degenerated Meadow in Songnen Plain,China

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Chinese Geographical Science 2009年第4期19卷 375-381页

作者： HAN Dayong LI Haiyan YANG Yunfei Key Laboratory for Vegetation Ecology of Ministry of Education Institute of Grassland Science Northeast Normal University Changchun 130024 China

A number of isolated islands of Leymus chinensis ＋ herbosa community were investigated in fragmented habitat islands, by Braun-Blanquet field survey approach, in a degenerated meadow in the Songnen Plain, China in 2007. These islands were classified as large, medium, and small scales on the basis of the island area （100-1000m2, large island; 50-100m2, middle island; 10-50m2, small island）. Each scale of the investigation involved eight islands. The responses ofβ-diversity patterns of plant taxon to the habitat fragmentation at local community and metacommunity levels were analyzed on different scales of 24 isolated islands. The results indicated that at the local community level, there were 57 species belonging to 20 families and 49 genera in large islands, 49 species belonging to 16 families and 40 genera in middle islands, and 27 species belonging to eight families and 23 genera in small islands, β-diversity indexes for species, genus and family in large, middle, and small islands varied greatly, and the highest value of the indexes was not noted in the largest island. However, the average of the data obtained at the three scales showed that across large islands, Whittaker indexes were low and Bray-Curtis similarity indexes were high, while across small islands, Whittaker indexes were high and Bray-Curtis similarity indexes were low. At the metacommunity level, Whittaker indexes for species and genus showed a great significantly negative double logarithmic correlation （p〈0.01） with the island area, whereas the Bray-Curtis indexes for species, genus and family showed a great significantly positive double logarithmic correlation （p〈0.01） with the island area. At both local community and metacommunity levels, tumovers of species and genus could respond more sensitively to spatial changes of plant diversity patterns than that of family. Hence, the species and the genus could be used for the analysis offl-diversity patterns of plant community.

关键词： habitat fragmentation local community metacommunity plant taxon β-diversity

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The assembly of plant-patch networks in Mediterranean alpine grasslands

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Journal of Plant Ecology 2020年第3期13卷 273-280页

作者： David S.Pescador José María Iriondo Gianalberto Losapio Adrián Escudero Departamento de Biología y Geología Física y Química InorgánicaEscuela Superior de Ciencias Experimentales y TecnologíaUniversidad Rey Juan CarlosMóstolesSpain Department of Environmental Systems Science ETH ZurichZurichSwitzerland Department of Biology Stanford UniversityStanfordCAUSA

Aims Harsh environmental conditions in alpine ecosystems shape vegetation structure into patches,where many different plant species cluster and grow ***,which factors are important for the structure and dynamics of such plant–patch networks remains poorly *** aim to assess which and how environmental and biotic factors predict the assembly of plant–patch networks along a mountain *** We examined the distribution of plant species in more than 5500 vegetation patches in 37 Mediterranean alpine grasslands distributed along a 500 m altitudinal gradient(National Park of Sierra Guadarrama,Spain).We established a plant–patch network for each grassland community and analyzed how nestedness and modularity vary with environmental(altitude,insolation and soil conditions)and biotic factors(number of species per plot,mean patch area and total pasture area).Important Findings Plant–patch networks showed consistent,non-random patterns characterized by a nested,but not modular,structure,which suggests that positive associations among co-occurring specialists promote their growth within patches as subsets of a pool with more generalist *** nestedness and modularity of plant–patch networks varied among ***,nestedness decreased with increasing species per plot and increased with mean patch area,while it was independent of environmental variables;modularity increased with increasing pasture area and species per *** negative relationship between species per plot and nested patterns may be linked to the restricted number of species that can coexist within the same patch at a given ***,the positive relationship between patch size and nestedness indicates that the growth of rare plant species within vegetation patches occupied by more abundant species is facilitated in bigger rather than smaller ***,these results indicate that the nested assembly of vegetation patches may be independent of abiotic cond

关键词： alpine ecosystems community assembly ecological networks metacommunity modularity nestedness patch dynamics

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