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Masting promotes transformation from predation to mutualism in an oak-weevil-rodent system

Science China(Life Sciences) 2024年第7期67卷 1514-1524页

作者： Hongmao Zhang Hongyu Niu Michael ASteele Liqing Peng Huimin He Aoqiang Li xianfeng yi Hongjun Li Zhibin Zhang Institute of Evolution and Ecology School of Life SciencesCentral China Normal UniversityWuhan 430079China State Key Laboratory of Integrated Management of Pest Insects and Rodents in Agriculture Institute of ZoologyChinese Academy of SciencesBeijing 100101China Department of Biology Wilkes UniversityWilkes-Barre 18766USA School of Life Sciences Qufu Normal UniversityQufu 273165China

The significance of ecological non-monotonicity(a function whose first derivative changes signs)in shaping the structure and functions of the ecosystem has recently been recognized,but such studies involving high-order interactions are ***,we have proposed a threetrophic conceptual diagram on interactions among trees,rodents,and insects in mast and non-mast years and tested the hypothesis that oak(Quercus wutaishanica)masting could result in increased mutualism and less predation in an oak-weevil-rodent system in a warm temperate forest of *** 14-year dataset revealed that mast years coincided with a relatively low rodent abundance but a high weevil *** not only benefited seedling recruitment of oaks through increased dispersal by rodents but also a decrease in predation by rodents and weevils,as well as an increase in the overwintering survival of *** appeared to have increased weevil survival by reducing predation of infested acorns by *** results suggest that masting benefits all participants in the plant-insect-rodent system by increasing mutualism and reducing predation behavior(i.e.,a non-monotonic function).Our study highlights the significance of masting in maintaining the diversity and function of the forest ecosystem by facilitating the transformation from predation to mutualism among trophic species.

关键词： antagonism ecological non-monotonicity mutualism seed-weevil-rodent system seedling recruitment rodent overwintering survival weevil survival

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The effects of seed detectability and seed traits on hoarding preference of two rodent species

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Integrative Zoology 2022年第5期17卷 944-952页

作者： Minghui WANG xianfeng yi College of Life Sciences Qufu Normal UniversityQufuChina

Seed traits play an important role in affecting seed preference and hoarding behaviors of small *** greatly affected by seed traits,seed detectability of competitors represents pilfering risks and may also modify seed hoarding preference of ***,whether seed traits and seed detectability show consistent effects on seed hoarding preference of animals remain largely ***,we explored how seed traits and seed detectability correlate with seed hoarding preference of Leopoldamys edwardsi and Apodemus chevrieri in a subtropical *** the effects of seed coat thickness and caloric value on hoarding preference of ***,we detected no signiﬁcant effects of other seed traits on hording preference of the 2 rodent *** was no correlation between larder-hoarding preference and inter-or intra-speciﬁc seed detectability of ***;however,seed detectability of *** was negatively correlated with its own scatter-hoarding *** scatter-hoarding preference of *** was not correlated with inter-and intra-speciﬁc seed detectability,larder-hoarding preference of *** was positively correlated with intra-speciﬁc seed *** study may provide evidence that intra-speciﬁc seed detectability rather than seed traits and inter-speciﬁc pilfering risks play an important role in modifying seed hoarding preference of rodents.

关键词： Apodemus chevrieri Leopoldamys edwardsi seed detectability seed hoarding preference seed traits

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肉羊规模化养殖技术探究

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广西农学报 2024年第1期39卷 148-153页

作者：易显菊张辉吴思谦周明旭易显凤广西畜禽品种改良站广西南宁530002 广西浩众农业科技有限公司广西南宁530201 广西农业职业技术大学广西南宁530007

规模化养殖是一种利用先进科技手段和管理方法达到或超过特定养殖数量标准、实现一定规模的现代化养殖方式,其特点是通过大规模集中化养殖畜禽的方式,形成标准化养殖技术和生产流程,从而提高生产效率和经济效益。文章从五个方面探索和... 详细信息

规模化养殖是一种利用先进科技手段和管理方法达到或超过特定养殖数量标准、实现一定规模的现代化养殖方式,其特点是通过大规模集中化养殖畜禽的方式,形成标准化养殖技术和生产流程,从而提高生产效率和经济效益。文章从五个方面探索和分析肉羊规模化养殖技术,旨在帮助肉羊企业更好地掌握规模化养殖技术,推动肉羊产业的深入发展。一是从提高生产效率、完善产业链等方面阐述肉羊规模化养殖的意义;二是从生长速度、抗病力、繁殖性能等方面分析肉羊规模化养殖的品种选择;三是从场址选择的原则、羊舍的类型与结构等方面探究规模化养殖场的规划建设;四是从饲料的选择与配制、饲养方式与饲养密度等方面探讨肉羊饲养管理方法;五是从繁殖技术手段、提高繁殖效率的措施等方面总结肉羊规模化养殖的繁殖技术。

关键词：肉羊规模化养殖技术

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Covalently tethering disulfonic acid moieties onto polyoxometalate boosts acid strength and catalytic performance for hydroxyalkylation/alkylation reaction

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Science China Chemistry 2022年第4期65卷 699-709页

作者： Lifei Lian Yubing Liu xianfeng yi Hanbin Hu Xiang Chen Hongqiang Li Wei Chen Anming Zheng Yu-Fei Song State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Wuhan Center for Magnetic Resonance Key Laboratory of Magnetic Resonance in Biological SystemsState Key Laboratory of Magnetic Resonance and Atomic and Molecular PhysicsWuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071China

Solid acid catalysts are widely used in the production of various high-value added and industrially important *** the use of organosilicon compounds to modify the vacancy site has been extensively studied,the covalent tethering-SO_(3)H functionalized organosilicon modified polyoxometalates(POMs)has been rarely *** this work,two catalysts(TBA_(4)[SiW_(11)O_(39)(O(SiC_(3)H_(6)SO_(3)H)_(2))](compound 2)and TBA_(4)[SiW_(11)O_(39)(O(SiC_(8)H_(8)SO_(3)H)_(2))](compound 3))were synthesized successfully through covalently grafting different sulfonic acid(-SO_(3)H)groups onto[SiW_(11)O_(39)]^(8−)cluster,*** 2 was achieved by surface grafting and in situ oxidation(3-mercaptopropyl)-trimethoxysilane,while compound 3 was achieved by surface grafting of 2-(4-chlorosulfonylphenyl)*** Brønsted acid strength of compounds 2 and 3 can be demonstrated by different methods including potentiometric titration,pyridine adsorption studies,and the ^(31)P trimethylphosphine oxides(TMPO)nuclear magnetic resonance(NMR).The systematic investigation of the relationship among POM structures,acid strength,and electron density was carried out based on density functional theory(DFT)calculation and experimental results,which revealed that covalent modification of compounds 2 and 3 decreased the electron density of the O-H bond,and promoted the release of H^(+).When applied in hydroxyalkylation/alkylation(HAA)reaction of 2-methylfuran(2-MF)with cyclohexanone,compound 2 exhibited better catalytic performance with conversion of ~93%,monocyclic fuel precursors(1a)yield of 79.9% and selectivity of 85.7% than compound 3,which can be attributed to strong Brønsted acid and the intramolecular hydrogen-bonding interactions between the neighboring -SO_(3)H moieties in compound ***,compound 2 also showed excellent catalytic activity in the HAA reaction of 2-MF with several different aldehydes and ketones(e.g.,furfuraldehyde,5-methylfurfurald

关键词： polyoxometalates sulfonic acid covalent modifications acid catalysis alkylation reaction

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High rodent abundance increases seed removal but decreases scatter-hoarding and seedling recruitment along an elevational gradient

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Integrative Zoology 2023年第5期18卷 843-858页

作者： Fei YU Linjun ZHANG Yang WANG xianfeng yi Shuang ZHANG Jianmin MA Zimei DONG Guangwen CHEN Keming MA State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijingChina College of Life Sciences Henan Normal UniversityXinxiangChina College of Life Sciences Qufu Normal UniversityQufuChina

The distributions of small rodents in mountainous environments across different elevations can provide important information regarding the effects of climate change on the dispersal of plant ***,few studies of oak forest ecosystems have compared the elevational patterns of sympatric rodent diversity,seed dispersal,seed bank,and seedling ***,we tested the differences in the seed disperser composition and abundance,seed dispersal,seed bank abundance,and seedling recruitment for Quercus wutaishanica along 10 elevation levels in the Taihang Mountains,*** results provide strong evidence that complex asymmetric seed dispersal and seedling regeneration exist along an elevational *** abundance of rodents had a significant negative correlation with the elevation and the seed removal rates peaked and then declined with increasing *** seed removal rates were higher at middle and lower elevations than higher elevations but acorns were predated by 5 species of seed predators at middle and lower elevations,and thus,there was a lower likelihood of recruitment compared with those dropped beneath mother oaks at higher *** importantly,the number of individual seeds in the seed bank and seedlings increased with the elevation,although dispersal services were reduced at sites lacking *** conditional mutualists,the rodents could possibly act as antagonistic seed predators rather than mutualistic seed dispersers at low and middle elevations,thereby resulting in the asymmetric pattern of rodent and seedling abundance with increasing elevation to affect the community assembly and ecosystem functions on a large spatial scale.

关键词： elevation rodent seed bank seed dispersal seedling distribution

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Rational construction of multiple hollow silicalite-1 zeolite with enhanced quasi acidity for robust vapor-phase Beckmann rearrangement

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Nano Research 2023年第5期16卷 7958-7966页

作者： Peng Zhang xianfeng yi Changjiu Xia Xinxin Peng Shuai Zhang Chengxiang Li Anmin Zheng Xiaoxin Zhang yibin Luo Lifeng Cui Fuhong Yu Xingtian Shu State Key Laboratory of Catalytic Materials and Reaction Engineering Research Institute of Petroleum ProcessingSINOPECBeijing 100083China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Center for Magnetic Resonance in WuhanWuhan Institute of Physics and MathematicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430071China Shandong Hualu-Hengsheng Chemical Co. Ltd.Dezhou 253024China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

Developing efficient and stable zeolites for vapor-phase Beckmann rearrangement of cyclohexanone oxime is still a great challenge to realizeε-caprolactam(CPL)green *** this work,the hierarchical porous silicalite-1 zeolites with multiple hollow structure(S-1-M)are explored by in-situ desilication−recrystallization post-treatment of spongy highway-like zeolites(S-1-S),which are synthesized through silanization synthesis of conventional bulky silicalite-1(S-1).Compared to S-1,S-1-M achieves superior catalytic performance,with improving the CPL selectivity from 85.7%to 94.1%and prolonging the catalyst lifetime from 74 to 126 h at a weight hourly space velocity(WHSV)of 6 h^(−1).Comprehensive physiochemical studies demonstrate that the highly dispersed intracrystalline cavities within S-1-M endow greater mass diffusion and better quasi acidity inducing by the enhanced H-bonds among abundant H-bonded silanols,which is cooperatively responsible for its superior catalytic performance.

关键词： hollow silicalite-1 H-bonded silanols quasi acidity vapor-phase Beckmann rearrangement

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Exclusion of interspecific competition reduces scatter-hoarding of Siberian chipmunk Tamias sibiricus:A field study

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Integrative Zoology 2020年第2期15卷 127-134页

作者： yinhua DENG Mengyao JU xianfeng yi College of Life Sciences Jiangxi Normal UniversityNanchangChina College of Life Sciences Qufu Normal UniversityQufuChina

Although food availability and the abundance of seed predators have been postulated to affect seed dispersal,it is not clear how seed-eating animals modify their scatter-hoarding strategies in response to different levels of interspecific *** placed paired germinated and ungerminated acorns of Quercus mongolica on 30-cm high platforms to exclude potential interspecific competition of the predominant larder hoarders Apodemus peninsulae and Myodes rufocanus,to investigate seed dispersal by a predominant scatter-hoarder,Tamias sibiricus,in the field in north-eastern *** results showed that *** ate more acorns in situ in the absence of interspecific *** the presence of interspecific competition of *** and ***,however,more acorns were scatter-hoarded by *** of interspecific competition,germination of acorns showed no significant effects on seed dispersal patterns,inconsistent with the“seed perishability hypothesis”that animals avoid hoarding seeds with high *** of interspecific competition,though relatively increasing the per capita seed abundance,appears to reduce seed dispersal,scatter-hoarding and seedling ***,we propose that moderate interspecific competition rather than competition exclusion may benefit seed scatter-hoarding and seedling establishment.

关键词： interspecific competition Quercus mongolica. seed dispersal seed perishability Tamias sibiricus

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Olfaction alters spatial memory strategy of scatter-hoarding animals

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Integrative Zoology 2021年第1期16卷 128-135页

作者： Sijie yi Minghui WANG Mengyao JU xianfeng yi College of Life and Environmental Sciences University of ExeterExeterUK College of Life Sciences Qufu Normal UniversityQufuChina

Although it has been suggested that olfaction is closely interconnected with hippocampal systems,whether olfaction regulates spatial memory strategy remains never ***,no study has examined how olfaction mediates spatial memory established on the external objects,for example,caches made by scatter-hoarding ***,we experimentally induced nondestructive and reversible olfaction loss of a scatter-hoarding animal Leopoldamys edwardsi,to test whether and how olfaction regulates spatial memory to mediate cache recovery and *** results showed that the normal *** preferred to pilfer caches of others rather than to recover their own using accurate spatial memory(35.7%vs.18.6%).Anosmic *** preferred to recover the caches they made prior to olfaction loss rather than to pilfer from others relied on spatial memory(54.2%vs.36.0%).However,*** with anosmia showed no preference either to the caches they established after olfaction loss or caches made by others(25.8%vs.29.1%).These collectively indicate that olfaction loss has a potential to affect new memory formation but not previously established spatial memory on *** study first showed that olfaction modified spatial memory strategy in cache recovery and pilferage behaviors of scatter-hoarding *** suggest that future studies pay more attention to the evolution of olfaction and its relationship with spatial memory strategy.

关键词： cache pilferage cache recovery olfaction scatter-hoarding spatial memory

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Transformation power or development pressure:economic growth targets and urban carbon productivity

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Chinese Journal of Population,Resources and Environment 2024年第2期22卷 176-184页

作者： Longtao Chen yi Zheng xianfeng Han Juan Liu School of Management and Economics Kunming University of Science and TechnologyKunming 650500China School of Foreign Languages and Literatures Chongqing Normal UniversityChongqing 401331China

Maintaining moderate economic growth targets(EGTs)is the key for local governments to effectively implement the“carbon peak and carbon neutrality”goals under the refreshed development *** panel data of 276 prefecture-level cities in China's Mainland from 2010 to 2020,and employing methods such as intermediary and threshold models,this study empirically analyzes the internal mechanism of EGT’s impact on urban carbon productivity(UCP).Our findings demonstrate that:①The overall EGT during the analyzed period is not conducive to improving *** conclusion remains valid after a series of robustness *** effect is more pronounced in the central region and resource-based cities than in the east-west region and non resource-based cities.②EGT not only directly suppresses UCP but also exerts indirect negative impacts on UCP from three aspects:delaying the digital economy(DE),constraining financial expansion(FE),and hindering green technology innovation(GTI).This negative indirect effect is similar to or even surpasses the direct effect,suggesting that the internal relationship between EGT and“dual-carbon”goals should be re-evaluated from a new compound perspective.③EGT not only has a simple linear impact on UCP but also significantly exhibits a dynamic evolution pattern in inverted“U”*** is,as EGT continuously upgrades,a nonlinear impact on UCP emerges in the form of“promoting first,suppressing later”.This indicates that surpassing the“degree”limit for EGT will be detrimental to the improvement of *** study broadens the scope of carbon productivity analysis by introducing a new perspective centered on *** insights gleaned from this research offer valuable guidance for local governments to effectively manage economic growth expectations and promote the synchronized achievement of dual-carbon objectives.

关键词： Economic growth target Urban carbon productivity Mediating effects Dynamic evolution

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Radicle pruning by seed-eating animals helps oak seedlings absorb more soil nutrient

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Integrative Zoology 2021年第5期16卷 637-645页

作者： xianfeng yi Minghui WANG Chao XUE Mengyao JU College of Life Sciences Qufu Normal UniversityQufuChina

Although radicle pruning has well been observed in plant-animal interactions,research has not been conducted to determine how radicle pruning by seed-eating animals regulates nutrition mobilization of cotyledonary reserves and absorption of soil *** used stable nitrogen isotopes to test how acorns of early-germinating oak species(Quercus variabilis,***,and ***)trade off nutrients in the cotyledons and those in the soil in response to radicle pruning by seed-eating *** pruning by rodents resulted in root branching in the 3 early-germinating oak ***,radicle pruning increased shoot dry weight and substantially reduced the root-to-shoot ratio of oak *** to the decreased dry weight of roots and root-to-shoot ratio,the dry weight of the remnant cotyledons was higher after radicle pruning in the 3 oak *** provided first evidence that radicle pruning by seed-eating animals improved seedling performance of early-germinating oaks by increasing absorption of nutrients from *** results indicate that early-germinating oak seedlings trade off nutrition budget by altering nutrient absorption from soil and reserve mobilization from cotyledons in response to radicle pruning by seed-eating *** study provided new insight into the nutrition allocation mechanism of young seedlings in response to radicle pruning by seed-eating animals,reflecting a mutualistic interaction between early-germinating oak and food-hoarding animals.

关键词： ^(15)N labeling biomass allocation oak radicle pruning seedling development

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