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A review of ecological impacts of global climate change on persistent organic pollutant and mercury pathways and exposures in arctic marine ecosystems

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Current Zoology 2015年第4期61卷 617-628页

作者： Melissa A. MCKINNEY Sara PEDRO Rune DIETZ Christian SONNE Aaron T. FISK Denis ROY Bjorn M. JENSSEN Robert J. LETCHER Department of Natural Resources and the Environment University of Connecticut Storrs CT 06269 USA Center for Environmental Sciences and Engineering University of Connecticut Storrs CT 06269 USA Department of Bioscience Arctic Research Centre Aarhus University Roskilde DK-4000 Denmark Great Lakes Institute for Environmental Research University of Windsor Windsor ON N9B 3P4 Canada Department of Biology Norwegian University of Science and Technology Trondheim NO-7491 Norway Wildlife and Landscape Science Directorate Science and Technology Branch Environment Canada National Wildlife Research Centre Carleton University Ottawa ON K1A 0H3 Canada

Bioaccumulative and biomagnifying contaminants, such as persistent organic pollutants （POPs） and mercury （Hg）, have for decades been recognized as a health concern in arctic marine biota. In recent years, global climate change （GCC） and related loss of arctic sea ice have been observed to be driving substantial change in arctic ecosystems. This review summarizes findings documenting empirical links between GCC-induced ecological changes and alterations in POP and Hg exposures and pathways in arctic marine ecosystems. Most of the studies have reported changes in POP or Hg concentrations in tissue in relation to GCC-induced changes in species trophic interactions. These studies have typically focused on the role of changes in abun- dance, habitat range or accessibility of prey species, particularly in relation to sea ice changes. Yet, the ecological change that re- suited in contaminant trend changes has often been unclear or assumed. Other studies have successfully used chemical tracers, such as stable nitrogen and carbon isotope ratios and fatty acid signatures to link such ecological changes to contaminant level variations or trends. Lower sea ice linked-diet changes/variation were associated with higher contaminant levels in some popula- tions of polar bears, ringed seals, and thick-billed murres, but the influence of changing trophic interactions on POP levels and trends varied widely in both magnitude and direction. We suggest that future research in this new area of GCC-linked ecotox- icology should focus on routine analysis of ancillary ecological metrics with POP and Hg studies, simultaneous consideration of the multiple mechanisms by which GCC and contaminant interactions can occur, and targeted research on changing exposures and toxicological effects in species known to be sensitive to both GCC and contaminants [Current Zoology 61 （4）： 617-628, 2015].

关键词： Climate change ecological change Contaminants Trends Arctic Marine ecosystems

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ecological health analysis of wetlands in the middle reaches of Yangtze River under changing environment

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International Journal of Digital Earth 2023年第1期16卷 3125-3144页

作者： Shengqing Zhang Xiaoyan Zhai Peng Yang Jun Xia Sheng Hu Libo Zhou Cai Fu Hubei Key Laboratory of Regional Ecology and Environmental change School of Geography and Information EngineeringChina University of GeosciencesWuhanPeople’s Republic of China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin Research Center on Flood and Drought Disaster ReductionChina Institute of Water Resources and Hydropower ResearchBeijingPeople’s Republic of China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhanPeople’s Republic of China Yangtze Valley Water Environment Monitoring Center WuhanPeople’s Republic of China Wuhan CGeo Clouds Science&Tech Co.Ltd WuhanPeople’s Republic of China

changes in wetland ecosystems have a critical impact on the local ecology and species *** development scenarios and policies are key factors influencing their ***,we studied changes of wetlands in the middle Yangtze River basin(MYRB)in 2001-2020,and a patch-generated land use simulation(PLUS)model and random forest(RF)method were applied to predict and analyze the changes under different scenarios in the MYRB in the future(i.e.2035-2095).The results indicated that:(1)The regions with high wetland proportions were concentrated in the central and eastern MYRB in 2001-2020,with a 1.5%decrease in overall wetland area;(2)The RF could simulate the future ecological quality with training and testing accuracies of 0.98 and 0.92,respectively;(3)Remote Sensing ecological Index(RSEI)less than 0.5 in the central and eastern regions and 13.3%reduction in the northwest in the SSP245 *** general,the study provides a basis for future regional studies of ecosystem quality and provides data to support wetland conservation and management.

关键词： Remote sensing machine learning ecological prediction ecological change Yangtze River basin

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A STOCHASTIC GENE DYNAMICS THROUGH PROTEIN PLOTS AND ecological changeS

A STOCHASTIC GENE DYNAMICS THROUGH PROTEIN PLOTS AND ECOLOGI...

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2011 World Congress on Engineering and Technology(CET 2011)

作者： S.Balamuralitharan S.Rajasekaran Department of Mathematics Sri Ramanujar Engineering CollegeChennai-48/India. Department of Mathematics B.S.ABDUR RAHMAN UNIVERSITYChennai-48/India.

This paper deals with stochastic process in testing the 2-state Markov *** observe that the relation between ecological fluctuations and protein changeover is *** model is tested further with the density function and found that the relation changes to Beta distribution as well as Gamma *** is also noticed that the moments of Beta and Gamma distributions converge to their stationary values exponentially with respect to ***,we conclude that protein changeover rate is relatively higher than ecological change.

关键词： ecological change protein plot Stationary distribution beta & gamma distribution

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