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Impacts of aggregation Methods and Trophospecies Number on the Structure and Function of Marine Food Webs

Journal of Ocean University of China 2024年第1期23卷 190-198页

作者： LI Pengcheng ZHANG Chongliang XU Binduo JI Yupeng LI Fan REN Yiping XUE Ying Laboratory of Fisheries Ecosystem Monitoring and Assessment College of FisheriesOcean University of ChinaQingdao 266003China Field Observation and Research Station of Haizhou Bay Fishery Ecosystem Ministry of EducationQingdao 266003China Shandong Marine Resources and Environment Research Institute Shandong Provincial Key Laboratory of Restoration for Marine EcologyYantai 264006China Laboratory for Marine Fisheries Science and Food Production Processes Laoshan LaboratoryQingdao 266237China

aggregation of species with similar ecological properties is one of the effective methods to simplify food web ***,species aggregation will affect not only the complexity of modeling process but also the accuracy of models’*** of aggregation methods and the number of trophospecies are the keys to study the simplification of food *** this study,three aggregation methods,including taxonomic aggregation(TA),structural equivalence aggregation(SEA),and self-organizing maps(SOM),were analyzed and compared with the linear inverse model–Markov Chain Monte Carlo(LIM-MCMC)*** of aggregation methods and trophospecies number on food webs were evaluated based on the robustness and unitless of ecological net-work *** showed that aggregation method of SEA performed better than the other two methods in estimating food web structure and function *** effects of aggregation methods were driven by the differences in species aggregation principles,which will alter food web structure and function through the redistribution of energy *** to the results of mean absolute percentage error(MAPE)which can be applied to evaluate the accuracy of the model,we found that MAPE in food web indices will increase with the reducing trophospecies number,and MAPE in food web function indices were smaller and more stable than those in food web structure ***,trade-off between simplifying food webs and reflecting the status of ecosystem should be con-sidered in food web *** findings highlight the importance of aggregation methods and trophospecies number in the analy-sis of food web *** study provided a framework to explore the extent to which food web models are affected by dif-ferent species aggregation,and will provide scientific basis for the construction of food webs.

关键词： LIM-MCMC model species aggregation trophospecies number aggregation methods food web indices

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Directional changes of species spatial dispersion and realized environmental niches drive plant community assembly during early plant succession

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Journal of Plant Ecology 2019年第3期12卷 409-418页

作者： Werner Ulrich Markus Klemens Zaplata Susanne Winter Anton Fischer Department of Ecology and Biogeography Nicolaus Copernicus University in TorunLwowska 1PL 87-100 ToruńPoland Hydrology and Water Resources Management Brandenburg University of Technology Cottbus-SenftenbergSiemens-Halske-Ring 10D-03046 CottbusGermany Faculty of Forest and Environment Section of Applied Ecology and ZoologyEberswalde University of Sustainable DevelopmentAlfred-Möller-Str.5D-16225 EberswaldeGermany Department of Geobotany Center of Life and Food SciencesTechnische Universität MünchenHans-Carl-von-Carlowitz-Platz 2D-85354 FreisingGermany

Aims Probabilistic models of species co-occurrences predict aggre-gated intraspecific spatial distributions that might decrease the degree of joint species occurrences and increase community ***,little is known about the influence of intraspecific aggre-gation on the co-occurrence of species in natural,species-rich ***,we focus on early plant succession and ask how changes in intraspecific aggregation of colonizing plant spe-cies influence the pattern of species co-existence,richness and *** We studied the early vegetation succession in a six ha constructed catchment within the abandoned part of a lignite mine in NE *** two spatial scales(1-and 25-m2 plots),we compared for each pair of species the intraspecific degree of aggregation and the pattern of co-occurrence and compared observed rela-tionships with temporal changes in important species functional *** Findings The majority of species occurred in an aggregated manner,particu-larly in the first 2 years of *** pairwise comparisons,we found an excess of segregated species occurrences leading to a posi-tive link between intraspecific aggregation and pairwise species seg-regation as predicted by the aggregation hypothesis,particularly at the lower spatial *** degree of intraspecific aggregation was negatively correlated with the community-wide level of species spatial turnover and with plot species *** results are the first direct confirmation that increasing intraspecific aggregation and interspecific competitive interactions counteract in shaping plant community structure during *** respective effects of aggregation were strongest at intermediate states of early succession.

关键词： primary succession spatial analysis environmental niche functional traits species aggregation

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