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62. Cover Image, Volume 1448, Issue 1

Author

Li, Zhongqiang, primary, Zaid, Waleed, additional, Hartzler, Thomas, additional, Ramos, Alexandra, additional, Osborn, Michelle L., additional, Li, Yanping, additional, Yao, Shaomian, additional, and Xu, Jian, additional

Published
2019
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64. Spatial patterns of leaf δ13C and δ15N of aquatic macrophytes in the arid zone of northwestern China.

Author

Gong, Xusheng, Xu, Zhiyan, Peng, Qiutong, Tian, Yuqing, Hu, Yang, Li, Zhongqiang, and Hao, Tao

Subjects
ARID regions, MACROPHYTES, PLANT ecophysiology, STABLE isotope analysis, STABLE isotopes, CARBON isotopes
Abstract

Analysis of stable isotope composition is an important tool in research on plant physiological ecology. However, large‐scale patterns of leaf‐stable isotopes for aquatic macrophytes have received considerably less attention. In this study, we examined the spatial pattern of stable isotopes of carbon (δ13C) and nitrogen (δ15N) of macrophytes leaves collected across the arid zone of northwestern China (approximately 2.4 × 106 km2) and attempted to illustrate its relationship with environmental factors (i.e., temperature, precipitation, potential evapotranspiration, sediment total carbon and nitrogen). Our results showed that the mean values of the leaf δ13C and δ15N in the macrophytes sampled from the arid zone were −24.49‰ and 6.82‰, respectively, which were far less depleted than those measured of terrestrial plants. The order of averaged leaf δ13C from different life forms was as follows: submerged > floating‐leaved > emergent. Additionally, our studies indicated that the values of foliar δ13C values of all the aquatic macrophytes were only negatively associated with precipitation, but the foliar δ15N values were mainly associated with temperature, precipitation, and potential evapotranspiration. Therefore, we speculated that water‐relation factors are the leaf δ13C determinant of macrophytes in the arid zone of northwestern China, and the main factors affecting leaf δ15N values are the complex combination of water and energy factors. [ABSTRACT FROM AUTHOR]

Published
2021
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65. Status of aquatic plants and its relationship with water environment factors in the lakes along the lower reaches of the Yangtze River

Author

LI Zhongqiang, SU Haojie, Zhang Xiaolin, Wu Yao, Kong Xianghong, and Xiao Lanlan

Subjects
Hydrology, Thesaurus (information retrieval), Aquatic plant, Earth and Planetary Sciences (miscellaneous), Yangtze river, Water environment, Environmental science, Aquatic Science, Pollution, Water Science and Technology
Published
2015
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72. Seed germination of three species of Vallisneria (Hydrocharitaceae), and the effects of freshwater microalgae

Author

Tu Manghui, Li Zhongqiang, and Dan Yu

Subjects
Biomass (ecology), Algae, Habitat, Germination, Vallisneria, Botany, Dormancy, Aquatic Science, Biology, biology.organism_classification, Hydrocharitaceae, Hydrobiology
Abstract

Two experiments were conducted to investigate seed germination under natural temperature and light regimes and to evaluate the influence of freshwater microalgae on seed germination of threeVallisneria species. Seeds exposed to natural seasonal temperature and light changes for 24 months germinated only in spring, perhaps indicating an annual dormancy/non-dormancy cycle. The ecological background of the natural habitat seems to play predominant roles in seed germinability. Mean cumulative seed germination percentages of Vallisneria natans, V. denseserrulata, andV.spinulosa of the first year were 35.2, 19.2, and 11.2%, respectively, and of the second year were 80, 72, and 32.4%, respectively. Germination rates differed significantly among the three Vallisneria species exposed to natural seasonal temperature and light changes in the first year, but differed only between Vallisneria spinulosa and the other two species in the second year. The differences of germination may influence the geographical distribution and thus be related to different survival strategies of the species. Seed germination rates in culture solution inoculated with algae were significantly higher than in solution with no algae. A strong correlation occurred between total biomass of freshwater microalgae and seed germination of the three studied species. Apparently, the extracellular products of freshwater microalgae may play an important role in seed germination. These results support the hypothesis that Vallisneria colonization may be mediated by algae facilitation.

Published
2005
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73. Antiparasitic efficacy of Gracillin and Zingibernsis newsaponin from Costus speciosus (Koen ex. Retz) Sm. against Ichthyophthirius multifiliis

Author

Wei Zheng, Wei-Qiang Chen, Ya-Bin Zhang, Xin-Hai Yu, Ze-Hong Li, Wang Xiulan, Chun-Mei Yan, Zhang-Wei Wang, Xiu-Ying Li, and Li Zhongqiang

Subjects
Carps, Antiparasitic, medicine.drug_class, Active components, Ciliophora Infections, Fractionation, Fish Diseases, Random Allocation, Goldfish, medicine, Spirostans, Animals, EC50, Hymenostomatida, biology, Ichthyophthirius multifiliis, Traditional medicine, Plant Extracts, Costus, Saponins, biology.organism_classification, Grass carp, Infectious Diseases, %22">Fish , Animal Science and Zoology, Parasitology
Abstract

SUMMARYThe present study aims to evaluate the antiparasitic activity of active components from Costus speciosus against Ichthyophthirius multifiliis. Bioassay-guided fractionation was employed to identify active compounds from C. speciosus yielding 2 bioactive compounds: Gracillin and Zingibernsis newsaponin. In-vitro assays revealed that Gracillin and Zingibernsis newsaponin could be 100% effective against I. multifiliis at concentrations of 0·8 and 4·5 mg L−1, with median effective concentration (EC50) values of 0·53 and 3·2 mg L−1, respectively. All protomonts and encysted tomonts were killed when the concentrations of Gracillin and Zingibernsis newsaponin were 1·0 and 5·0 mg L−1. In-vivo experiments demonstrated that fish treated with Gracillin and Zingibernsis newsaponin at concentrations of 1·0 and 5·0 mg L−1 carried significantly fewer parasites than the control (P−1) during the trial, although 100% of untreated fish died. Acute toxicities (LD50) of Gracillin and Zingibernsis newsaponin for grass carp were 1·64 and 20·7 mg L−1, respectively. These results provided evidence that the 2 compounds can be selected as lead compounds for the development of new drugs against I. multifiliis.

Published
2014

79. Research on red tide rapid monitoring and warning technology based GIS

Author

Bu Zhiguo, Li Zhongqiang, and Gao Xiaohui

Subjects
Oceanography, Geographic information system, Meteorology, Warning system, business.industry, Red tide, Environmental science, ComputerApplications_COMPUTERSINOTHERSYSTEMS, Monitoring system, business, GeneralLiterature_MISCELLANEOUS
Abstract

The rapid monitoring and warning technologies of red tide have been a hot topic research as red tide was one of global marine disasters. In this paper, the author described red tide rapid monitoring and warning technologies, then discussed the construction of rapid monitoring system. Article also described the rapid monitoring and warning system based GIS, which made great contribution of red tide's rapid warning in Qingdao Olympic sailing.

Published
2010
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88. Climate warming and heat waves affect reproductive strategies and interactions between submerged macrophytes.

Author

Li, Zhongqiang, He, Liang, Zhang, Huan, Urrutia‐Cordero, Pablo, Ekvall, Mattias K., Hollander, Johan, and Hansson, Lars‐Anders

Subjects
*HEAT waves (Meteorology), *ECOSYSTEMS, *FRESH water, *TEMPERATURE, *BIODIVERSITY, *FLOWERS
Abstract

Extreme climatic events, such as heat waves, are predicted to increase in frequency and intensity during the next hundred years, which may accelerate shifts in hydrological regimes and submerged macrophyte composition in freshwater ecosystems. Since macrophytes are profound components of aquatic systems, predicting their response to extreme climatic events is crucial for implementation of climate change adaptation strategies. We therefore performed an experiment in 24 outdoor enclosures (400 L) separating the impact of a 4 °C increase in mean temperature with the same increase, that is the same total amount of energy input, but resembling a climate scenario with extreme variability, oscillating between 0 °C and 8 °C above present conditions. We show that at the moderate nutrient conditions provided in our study, neither an increase in mean temperature nor heat waves lead to a shift from a plant-dominated to an algal-dominated system. Instead, we show that species-specific responses to climate change among submerged macrophytes may critically influence species composition and thereby ecosystem functioning. Our results also imply that more fluctuating temperatures affect the number of flowers produced per plant leading to less sexual reproduction. Our findings therefore suggest that predicted alterations in climate regimes may influence both plant interactions and reproductive strategies, which have the potential to inflict changes in biodiversity, community structure and ecosystem functioning. [ABSTRACT FROM AUTHOR]

Published
2017
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98. Seed weight and germination behavior of the submerged plant Potamogeton pectinatus in the arid zone of northwest China.

Author

Li, Zhongqiang, Lu, Wei, Yang, Lei, Kong, Xianghong, and Deng, Xuwei

Subjects
*SAGO pondweed, *MACROPHYTES, *WEIGHT of seeds, *AQUATIC plants, *PLANT fertility, *PLANTS, *PLANT reproduction, *REPRODUCTION
Abstract

Variation in seed weight is common within and among plant species, but few studies have attempted to document the pattern of seed weight and germination attributes for aquatic macrophytes at a large scale. This study examined within-species variation in seed weight and germination attributes and the effects of environmental factors on seed traits of the submerged plant Potamogeton pectinatus in the arid zone of northwest China. Our results showed that the average seed weight was 0.24 g per 100 seeds with a coefficient of variation ( CV) of 28.4% among the eight P. pectinatus populations. The total germination fraction of seeds of P. pectinatus was relatively poor, less than 35% in seven P. pectinatus populations, and the lowest germination percentage found was only 2%. There were significant differences in seed weight, time to onset of germination, and total germination fraction among the eight different populations. Hierarchical partitioning analysis showed a strongly positive correlation between seed weight and water temperature and pH. Seed weight and the maternal environmental factors significantly affected both time to initiation of germination and total germination fraction. Our results suggest that (1) seed weight variation in P. pectinatus primarily is the result of temperature variation during fruit development; (2) relatively poor germination fraction suggests that seeds are relatively unimportant in the short-term survival of populations and that it may be another adaptive trait allowing plants to take place in the right place and at the right time, especially in harsh environment; and (3) variation in seed germination traits should be determined by local environmental and intrinsic factors that interact in a complex fashion. [ABSTRACT FROM AUTHOR]

Published
2015
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